Battery cell, method of manufacturing the same, and battery module including the same

Abstract

A battery cell according to one embodiment of the present application includes a battery case having an electrode assembly mounted in a receiving portion, and including a sealing portion of a structure having a sealed outer periphery; an electrode lead wire electrically connected to an electrode tab included in the electrode assembly, and protruding in an outward direction of the battery case through the sealing portion; a lead wire film located at a portion of an upper portion and / or a lower portion of the electrode lead wire corresponding to the sealing portion; and a getter portion formed at a local area between the electrode lead wire and the sealing portion, wherein the getter portion includes a first end portion facing an outside of a body of the battery case and a second end portion facing an inside of the battery case, and the first end portion is covered by the lead wire film without being covered by the battery case.

Description

Technical Field

[0001] This application claims priority to Korean Patent Application No. 10-2021-0025910, filed in Korea on February 25, 2021, the disclosure of which is incorporated herein by reference.

[0002] This disclosure relates to a battery cell, a method of manufacturing the battery cell, and a battery module including the battery cell. More specifically, it relates to a battery cell capable of venting gases generated inside the battery cell to the outside while minimizing moisture infiltration from the outside, a method of manufacturing the battery cell, and a battery module including the battery cell. Background Technology

[0003] With technological advancements and increasing demand for mobile devices, the need for secondary batteries as an energy source is rapidly growing. In particular, secondary batteries are attracting attention not only as a power source for mobile devices such as mobile phones, digital cameras, laptops, and wearable devices, but also as a power source for vehicles such as electric bicycles, electric cars, and hybrid vehicles.

[0004] Based on the shape of the battery casing, these secondary batteries are classified as cylindrical batteries and prismatic batteries in which the battery assembly is contained in a cylindrical or prismatic metal can, and pouch batteries in which the battery assembly is contained in a pouch-type casing made of aluminum laminate. Here, the battery casing contains a power element that includes a positive electrode, a negative electrode, and a separator inserted between the positive and negative electrodes, and is capable of charging and discharging. It is classified as wound-core type and stacked type. In the wound-core type, long sheet-shaped positive and negative electrodes coated with active material are wound with a separator inserted between them. In the stacked type, multiple positive and negative electrodes are stacked sequentially with a separator inserted between them.

[0005] In particular, pouch batteries, in which stacked or stacked / folded battery assemblies are included in pouch battery housings made of aluminum laminates, are increasingly used due to their low manufacturing cost, light weight, and ease of modification.

[0006] Figure 1 This is a top view showing a conventional battery cell. Figure 2 It is along Figure 1 The cross-sectional view taken along axis a-a'. (Refer to...) Figure 1 and Figure 2A conventional battery cell 10 includes a battery housing 20 and a sealing portion 25. The battery housing 20 has a receiving portion 21 in which the battery assembly 11 is mounted. The sealing portion 25 is formed by heat-sealing the outer periphery of the battery housing. Here, the battery cell 10 includes electrode leads 30 protruding from the battery housing 20 via the sealing portion 25, and a lead film 40 is located between the upper and lower portions of the electrode leads 30 and the sealing portion 25.

[0007] However, with the increase in energy density of battery cells in recent years, there is also a problem of increased gas generation inside the battery cell. In the case of a conventional battery cell 10, there is no component for venting the gas generated inside the battery cell, so venting may occur within the battery cell due to gas generation. Furthermore, moisture may penetrate into the battery cell damaged by venting, which may cause side reactions and lead to battery performance degradation and the generation of additional gas. Therefore, there is an increasing need to develop a battery cell that can vent the gas generated inside the battery cell to the outside while minimizing moisture penetration from the outside. Summary of the Invention

[0008] Technical issues

[0009] This disclosure aims to address the problems of the prior art, and therefore aims to provide a battery cell capable of venting gases generated inside the battery cell to the outside while minimizing moisture penetration from the outside, a method for manufacturing the battery cell, and a battery module including the battery cell.

[0010] The purposes of this disclosure are not limited to those described above, and those skilled in the art will clearly understand, through this specification and the accompanying drawings, purposes not mentioned herein.

[0011] Technical solution

[0012] In one aspect of this disclosure, a battery cell is provided, the battery cell comprising: a battery housing having a receiving portion and a sealing portion, wherein an electrode assembly is mounted in the receiving portion, the sealing portion being formed by sealing the outer periphery of the battery housing; an electrode lead electrically connected to an electrode connector included in the electrode assembly and protruding beyond the battery housing via the sealing portion; a lead film located at a portion of at least one of the upper and lower portions of the electrode lead corresponding to the sealing portion; and a suction unit formed in a local region between the electrode lead and the sealing portion, wherein the suction unit includes a first end facing outwards from the battery housing and a second end facing inwards from the battery housing, and the first end is covered by the lead film but not by the sealing portion.

[0013] The second end may not be covered by the lead film and may not overlap with the sealing portion.

[0014] The getter unit may be directly formed on the electrode lead, and the lead film may be disposed on the electrode lead with the getter unit interposed between the lead film and the electrode lead.

[0015] The thickness of the lead film located on the getter unit may be from 100 μm to 300 μm.

[0016] The lead film may include a first lead film in direct contact with the electrode lead and a second lead film provided on the first lead film, with the getter unit interposed between the first lead film and the second lead film.

[0017] The thickness of the second lead film may be from 100 μm to 300 μm.

[0018] The getter unit may include at least one moisture-absorbing material selected from calcium oxide (CaO), barium oxide (BaO), lithium chloride (LiCl), calcium (Ca), and barium (Ba).

[0019] The getter unit may contain an adhesive material including at least one selected from polyolefin-based polymers, acrylic-based polymers, and fluorine-based polymers.

[0020] The lead film may contain a polyolefin-based material.

[0021] The lead film may be configured to surround all of the upper portion of the electrode lead, the lower portion of the electrode lead, and the side surface of the electrode lead connecting the upper and lower portions.

[0022] The thickness of the getter unit may be from 50 μm to 150 μm.

[0023] The gas permeability of the getter unit may be 1.6e 5 Barrer to 1.6e 7 Barrer.

[0024] The area where the first end of the getter unit is exposed to the outside of the sealing portion may be larger than the area where the second end of the getter unit is exposed to the inside of the sealing portion.

[0025] The width between the first end and the outermost end of the lead film may be 2 mm or more.

[0026] At 60 °C, the gas permeability of the lead film may be from 20 Barrer to 60 Barrer.

[0027] Under conditions of 25°C and 50% RH, the moisture permeability of the lead film can be from 0.02g to 0.2g over 10 years.

[0028] In another aspect of this disclosure, a method for manufacturing a battery cell is also provided, the method comprising the steps of: preparing an electrode assembly and electrode leads electrically connected to an electrode connector included in the electrode assembly; mounting the electrode assembly in a receiving portion of a battery housing such that the electrode leads protrude in an outward direction from the battery housing; and sealing the outer periphery of the battery housing to form a sealing portion, wherein the step of preparing the electrode assembly comprises: attaching a lead film to the electrode leads to a region corresponding to the sealing portion in at least one of the upper and lower portions of the electrode leads; and coating the electrode leads with a getter resin to form a getter unit, wherein the getter unit includes a first end facing outward from the battery housing and a second end facing inward from the battery housing, and wherein the first end is covered by the lead film and not covered by the sealing portion.

[0029] The getter resin may include at least one moisture-absorbing material selected from calcium oxide (CaO), barium oxide (BaO), lithium chloride (LiCl), calcium (Ca), and barium (Ba); and an adhesive material selected from at least one polyolefin polymer, acrylic polymer, and fluoropolymer.

[0030] The second end may not be covered by the lead film and may not overlap with the sealing portion.

[0031] In another aspect of this disclosure, a battery module is also provided, which includes the aforementioned battery cell.

[0032] Beneficial effects

[0033] According to the embodiments, this disclosure provides a battery cell capable of venting gas generated inside the battery cell to the outside while minimizing moisture penetration from the outside, a method for manufacturing the battery cell, and a battery module including the battery cell, thereby venting gas generated inside the battery to the outside while minimizing moisture penetration from the outside.

[0034] The effects of this disclosure are not limited to those described above; those skilled in the art will clearly understand, through this specification and the accompanying drawings, the effects not mentioned herein. Attached Figure Description

[0035] Figure 1 This is a top view showing a conventional battery cell.

[0036] Figure 2 It is along Figure 1A cross-sectional view taken from the axis a-a'.

[0037] Figure 3 This is a top view showing a battery cell according to an embodiment of the present disclosure.

[0038] Figure 4 It is along Figure 3 The cross-sectional view taken from the axis bb′.

[0039] Figures 5a to 5e This is a partial top view showing a battery cell of a variant embodiment according to the present disclosure.

[0040] Figure 6 This is a cross-sectional view showing a battery cell according to another embodiment of the present disclosure. Detailed Implementation

[0041] In the following, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings to facilitate implementation by those skilled in the art. The present disclosure may be implemented in various different forms and is not limited to the embodiments described herein.

[0042] For clarity of this disclosure, parts not related to the description have been omitted, and identical or similar parts are given the same reference numerals throughout the specification.

[0043] Furthermore, since the dimensions and thicknesses of each component shown in the accompanying drawings are arbitrarily represented for ease of description, this disclosure is not necessarily limited to the drawings. Thicknesses have been enlarged to clearly illustrate the various layers and regions in the drawings. Additionally, the thicknesses of some layers and regions have been exaggerated in the drawings for ease of interpretation.

[0044] Furthermore, throughout the specification, when a section “includes” a particular component, it means, unless otherwise stated, that other components may be further included, rather than excluded.

[0045] Furthermore, throughout the instruction manual, when "top view" is mentioned, it means viewing the target part from above, and when "cross-section view" is mentioned, it means viewing the vertically cut portion of the target part from the side.

[0046] In the following text, reference will be made to Figures 3 to 5e A pouch-type battery cell 100 according to an embodiment of this disclosure is described. However, here, the description will be based on one of the two side surfaces of the pouch-type battery cell 100, but is not limited thereto, and the same or similar content may be described in the case of the other side surface.

[0047] Figure 3 This is a top view showing a battery cell according to an embodiment of the present disclosure. Figure 4 It is along Figure 3The cross-sectional view taken from the axis bb′. Figures 5a to 5e This is a partial top view showing a battery cell of a variant embodiment according to the present disclosure.

[0048] Reference Figure 3 According to this embodiment, the battery cell 100 includes a battery housing 200, electrode leads 300, and lead film 400.

[0049] The battery housing 200 includes a receiving portion 210 in which the electrode assembly 110 is mounted, and a sealing portion 250 formed by sealing its outer periphery. The sealing portion 250 can be sealed by heat, laser, or the like. The battery housing 200 may be a laminate comprising a resin layer and a metal layer. More specifically, the battery housing 200 may be made of a laminate and may include an outer resin layer forming the outermost layer, a barrier metal layer to prevent material penetration, and an inner resin layer for sealing.

[0050] Furthermore, the electrode assembly 110 may have a core-type (wound), laminated, or composite (laminated / folded) structure. More specifically, the electrode assembly 110 may include a positive electrode, a negative electrode, and a separator disposed between the positive and negative electrodes.

[0051] Electrode leads 300 are electrically connected to electrode connectors (not shown) included in electrode assembly 110 and protrude beyond battery housing 200 via sealing portions 250. Furthermore, lead films 400 are located in at least one of the upper and lower portions of electrode leads 300 corresponding to the sealing portions 250. Therefore, lead films 400 can improve the sealing characteristics of sealing portions 250 and electrode leads 300 while preventing short circuits in electrode leads 300 during heat sealing.

[0052] A gas intake unit 500 is formed in at least a partial region of the electrode lead 300. The gas intake unit 500 may be formed in the region between the electrode lead 300 and the sealing portion 250. The gas intake unit 500 includes a first end 510 facing outwards towards the battery housing 200 and a second end 520 facing inwards towards the battery housing 200. In this case, the first end 510 is covered by the lead film 400 and is simultaneously configured to be exposed and not covered by the sealing portion 250. Therefore, gases generated inside the battery cell can be discharged to the outside through the first end 510.

[0053] Furthermore, the second end 520 may be located inside the battery housing 200 (i.e., covered by the battery housing 200) and is configured not to be covered by the lead film 400 and not to overlap with the sealing portion 250. Therefore, gas generated inside the battery cell can pass through the intake unit 500 through the second end 520 and be discharged to the outside through the portion not covered by the sealing portion 250 (i.e., through the first end 510).

[0054] In one embodiment of this disclosure, the air permeability of the intake unit 500 can be 1.6e. 5 Barrer to 1.6e 7 Barrer, or 1e 6 Barrer to 3e 6 Barrer. For example, the carbon dioxide permeability of the intake unit 500 can meet the above range.

[0055] In one embodiment of this disclosure, the intake unit 500 may have a thickness of 50 μm to 150 μm. If the thickness of the intake unit 500 meets the above range, the gas inside the battery housing 200 can be more easily discharged to the outside.

[0056] The getter unit 500 may be made of a material having a higher melting point than the material of the lead film 400. Additionally, the getter unit 500 may be made of a material that does not react with the electrolyte contained in the battery casing 200. For example, the getter unit 500 may include an adhesive having at least one of olefin-based resins, acrylic-based resins, and fluoropolymers. The olefin-based resin may include at least one material selected from the group consisting of polypropylene, polyethylene, and polyvinylidene fluoride (PVDF). The fluoropolymer may include at least one material selected from the group consisting of polytetrafluoroethylene and polyvinylidene fluoride.

[0057] Furthermore, the getter unit 500 includes a moisture-absorbing material to increase gas permeability while minimizing moisture permeability. For example, the moisture-absorbing material can be calcium oxide (CaO), barium oxide (BaO), lithium chloride (LiCl), silicon dioxide (SiO2), calcium (Ca), barium (Ba), etc., but is not limited to these. Any material that reacts with water (H2O) can be used. By configuring the getter unit 500 in this way, even if moisture permeates into the portion of the lead film 400 not covered by the battery housing 200 (particularly the sealing portion 250), the moisture is removed by reacting with the moisture-absorbing material of the getter unit 500, thus preventing moisture penetration into the battery housing 200.

[0058] Furthermore, the suction unit 500 can be formed by coating the electrode lead 300 with a suction resin containing the aforementioned adhesive and / or moisture-absorbing material using a known coating method. For example, the suction unit 500 can be formed by coating methods such as inkjet printing, spraying, spin coating, or blade coating. Therefore, the suction unit 500 can be formed into a desired shape in various ways, and the suction unit 500 can be easily formed by coating the electrode lead 300 with the suction unit 500 and then attaching the suction unit 500 when sealing the electrode lead 300.

[0059] Reference Figure 4The gas introduced into the intake unit 500 can be discharged along the Z-axis direction through the lead film 400 on the first end of the intake unit 500.

[0060] In one embodiment of this disclosure, the area of ​​the first end of the intake unit 500 exposed to the outside of the sealing portion 250 can be larger than the area of ​​the second end of the intake unit 500 exposed to the inside of the sealing portion 250. The gas emission rate is proportional to the gas emission area and pressure. Since the pressure inside the battery housing 200 is greater than the pressure outside the battery housing 200, if the area of ​​the first end exposed to the outside of the sealing portion 250 is larger than the area of ​​the second end exposed to the inside of the sealing portion 250, the gas generated inside the battery housing 200 can be more easily discharged to the outside. Here, "outer side of the sealing portion" refers to the area of ​​the battery housing further outward in the outward direction than the end of the sealing portion, and "inner side of the sealing portion" refers to the area of ​​the battery housing further inward in the inward direction than the end of the sealing portion.

[0061] In one embodiment of this disclosure, the area of ​​the first end exposed outside the sealing portion 250 may be 40 mm. 2 Up to 80mm 2 This is based on the size of the device, which can emit approximately 0.5cc to 3cc of gas per day at 60°C and an internal pressure of 1 atm. Furthermore, this is the size of the device, which can achieve a moisture permeability of 0.02g to 0.2g over 10 years under conditions of 25°C and 50% RH.

[0062] Reference Figure 4 The thickness H of the lead film 400 on the intake unit 500 can be from 100 μm to 300 μm, or from 100 μm to 200 μm. If the thickness H of the lead film 400 on the intake unit 500 meets the above range, the gas inside the battery housing 200 can be more easily discharged to the outside.

[0063] Reference Figure 4 The width W between the first end and the outermost end of the lead film can be 2 mm or greater, or 2 mm to 3 mm. If the width W between the first end and the outermost end of the lead film meets the above range, it will be easier to prevent the lead film 400 from being torn during the process of venting the gas generated inside the battery housing 200 to the outside.

[0064] Meanwhile, the lead film 400 can be located at the upper part and the lower part of the electrode lead 300, and can be formed to connect the upper and lower parts to completely cover the side surface of the electrode lead 300. Therefore, the lead film 400 can prevent the side surface of the electrode lead 300 from being exposed to the outside, while improving the sealing performance of the sealing portion 250 and the electrode lead 300.

[0065] In one embodiment of this disclosure, the permeability of the lead film 400 can be 20 Barrer to 60 Barrer, or 30 Barrer to 40 Barrer, at 60°C. For example, the carbon dioxide permeability of the lead film 400 can meet the above range. Furthermore, based on the thickness of the lead film 400 of 200 μm, the permeability at 60°C can meet the above range. If the permeability of the lead film 400 meets the above range, the gas generated inside the battery cell can be discharged more effectively.

[0066] In this specification, air permeability can be measured using ASTM F2476-20.

[0067] In one embodiment of this disclosure, under conditions of 25°C and 50% RH, the moisture permeability of the lead membrane 400 can be 0.02g to 0.2g, or 0.02g to 0.04g, or 0.06g or 0.15g over 10 years. If the moisture permeability of the lead membrane 400 meets the above range, moisture can be more effectively prevented from penetrating from the lead membrane 400.

[0068] The moisture permeability of the leaded membrane 400 can be measured using the ASTM F 1249 method. In this case, equipment officially certified by MCOON can be used to measure the moisture permeability.

[0069] In one embodiment of this disclosure, the lead membrane 400 can have a gas permeability of 20 to 60 Barrer at 60°C and a moisture permeability of 0.02 g to 0.2 g over 10 years at 25°C and 50% RH. If the gas permeability and moisture permeability of the lead membrane 400 meet the above ranges, moisture can be prevented from penetrating from the outside more effectively while discharging the gas generated inside the secondary battery.

[0070] In one embodiment of this disclosure, the lead membrane 400 may comprise a polyolefin-based resin. For example, the lead membrane 400 may comprise a polyolefin-based resin that satisfies the aforementioned air permeability and / or moisture permeability values. The polyolefin-based resin may comprise at least one material selected from the group consisting of polypropylene, polyethylene, and polyvinyl difluoroethylene (PVDF). Although the lead membrane 400 comprises polypropylene, the gas permeability of the lead membrane 400 may be from 20 Barrer to 60 Barrer at 60°C. Furthermore, the moisture permeability may be from 0.06 g to 0.15 g. In this case, gases generated inside the secondary battery can be discharged more effectively, and moisture can be easily prevented from permeating from the outside.

[0071] Furthermore, since the lead film 400 is made of the aforementioned materials, the lead film 400 can maintain the airtightness of the battery cell 100 and prevent internal electrolyte leakage.

[0072] The shape of the intake unit 500 is not particularly limited, as long as the first end of the intake unit exposed to the outside of the battery housing 200 and not covered by the sealing portion 250 is formed to be covered by the lead film 400. Therefore, considering the processing environment, the shape of the intake unit 500 can be appropriately modified to control durability and airtightness.

[0073] In a variation of one embodiment of this disclosure, such as Figures 5a to 5e As shown, the shape of the intake unit 500 can be modified in various ways. That is, intake units of various shapes can be formed, such as those having... Figure 5a The strip-shaped intake unit 501 in the middle has, as Figure 5b The longer external length of the intake unit 502 in the middle, such as Figure 5c The semi-circular intake unit 503 shown is as follows: Figure 5d The leg-shaped intake unit 504 shown, and as shown Figure 5e The suction unit 505 shown is formed with a large area. Here, "outer side" refers to the area of ​​the suction unit that is not covered by the sealed portion, and "length of the outer side" refers to the maximum distance between one end and the other end of the suction unit 502 in a direction orthogonal to the protruding direction of the electrode lead 300.

[0074] Next, we will refer to Figure 6 Another embodiment of this disclosure is described.

[0075] Figure 6 This is a cross-sectional view showing a battery cell according to another embodiment of the present disclosure.

[0076] like Figure 6 As shown, in another embodiment of this disclosure, the lead film 400 includes a first lead film 410 formed directly on the electrode lead 300 and a second lead film 420 formed on the first lead film 410 and inserted between them. This structure can be obtained by coating the getter unit 500 onto the electrode lead 300 on which the first lead film 410 has already been formed, and then forming the second lead film 420. Therefore, the getter unit 500 can be simply applied to a conventional electrode lead 300 on which the first lead film 410 has already been attached.

[0077] Reference Figure 6 The thickness H of the second lead film 420 can be from 100 μm to 300 μm, or from 100 μm to 200 μm. If the thickness H of the second lead film 420 meets the above range, the gas inside the battery housing 200 can be more easily discharged to the outside.

[0078] According to the embodiments of this disclosure as described above, the gas generated inside the battery housing 200 can be easily discharged to the outside while maintaining the sealing force of the battery housing 200. In particular, even if moisture permeates from the outside through the gas discharge channel, the moisture can be immediately removed by the intake unit 500, thus easily preventing moisture from penetrating into the battery housing 200. Furthermore, the intake unit 500 can be implemented using a simple process of coating only the electrode leads 300 with an intake resin.

[0079] A battery module according to another embodiment of this disclosure includes the aforementioned battery cells. Furthermore, one or more battery modules according to this embodiment can be encapsulated in a battery pack housing to form a battery pack.

[0080] The aforementioned battery module and battery pack including the battery module can be applied to various devices. These devices can be vehicles such as electric bicycles, electric cars, hybrid electric vehicles, etc., but this disclosure is not limited thereto, and this disclosure can be applied to various devices that can use the battery module and battery pack including the battery module, which is also within the scope of the claims of this disclosure.

[0081] Although the preferred embodiments of this disclosure have been described in detail above, the scope of this disclosure is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concepts of this disclosure as defined in the appended claims also fall within the scope of this disclosure.

Claims

1. A battery cell comprising: a battery case having an accommodation portion in which an electrode assembly is installed and a sealing portion formed by sealing an outer periphery of the battery case; an electrode lead wire electrically connected to an electrode tab included in the electrode assembly and protruding outside the battery case via the sealing portion; a lead wire film at a portion of at least one of an upper portion and a lower portion of the electrode lead wire corresponding to the sealing portion; and a getter unit formed in a partial region between the electrode lead wire and the sealing portion, wherein the getter unit includes a first end toward an outside of the battery case and a second end toward an inside of the battery case, the first end of the getter unit is covered by the lead wire film and is not covered by the sealing portion, a gas introduced into the getter unit is discharged in a Z-axis direction through the lead wire film on the first end of the getter unit, and a gas permeability of the lead wire film is 20 barrer to 60 barrer at 60℃. 2.The battery cell of claim 1, wherein the second end of the getter unit is not covered by the lead wire film and does not overlap the sealing portion. 3.The battery cell of claim 1, wherein the getter unit is directly formed on the electrode lead wire, and the lead wire film is disposed on the electrode lead wire with the getter unit interposed between the lead wire film and the electrode lead wire. 4.The battery cell of claim 3, wherein a thickness of the lead wire film on the getter unit is 100 μm to 300 μm. 5.The battery cell of claim 1, wherein the lead wire film includes a first lead wire film in direct contact with the electrode lead wire and a second lead wire film disposed on the first lead wire film, the getter unit being interposed between the first lead wire film and the second lead wire film. 6.The battery cell of claim 5, wherein a thickness of the second lead wire film is 100 μm to 300 μm. 7.The battery cell of claim 1, wherein, the getter unit includes at least one hygroscopic material selected from calcium oxide CaO, barium oxide BaO, lithium chloride LiCl, silicon dioxide SiO2, calcium Ca, and barium Ba. 8.The battery cell of claim 7, wherein the getter unit includes a binder material including at least one selected from a polyolefin-based polymer, an acrylic-based polymer, and a fluorine-based polymer. 9.The battery cell of claim 1, wherein, the lead wire film includes a polyolefin-based material. 10.The battery cell of claim 1, wherein the lead wire film is configured to surround all of an upper portion of the electrode lead wire, a lower portion of the electrode lead wire, and a side surface of the electrode lead wire connecting the upper portion and the lower portion. 11.The battery cell of claim 1, wherein a thickness of the getter unit is 50 mm to 150 mm. 12.The battery cell of claim 1, wherein, The air intake unit has an air permeability of 1.6 e 5 Baller to 1.6 e 7 Baller. 13.The battery cell of claim 1, wherein An area of the first end of the getter unit exposed to an outside of the sealing portion is greater than an area of the second end of the getter unit exposed to an inside of the sealing portion.

14. The battery cell of claim 1, wherein A width between the first end and the outermost end of the lead film is 2 mm or more.

15. The battery cell of claim 1, wherein A moisture permeation amount of the lead film is 0.02 g to 0.2 g for 10 years under a condition of 25°C, 50% RH.

16. The battery cell of claim 1, wherein, The getter unit is made of a material having a higher melting point than a material of the lead film.

17. The battery cell of claim 1, wherein, The getter unit is made of a material that does not react with an electrolyte contained in the battery case.

18. A method of manufacturing a battery cell, the method of manufacturing a battery cell comprising the steps of: preparing an electrode assembly and an electrode lead electrically connected to an electrode tab included in the electrode assembly; mounting the electrode assembly in a receiving portion of a battery case so that the electrode lead protrudes in an outward direction of the battery case; and sealing an outer periphery of the battery case to form a sealing portion, wherein the step of preparing an electrode assembly comprises: attaching a lead film to the electrode lead to be located in a region corresponding to the sealing portion in at least one of an upper portion and a lower portion of the electrode lead; and applying a getter resin on the electrode lead to form a getter unit, wherein the getter unit includes a first end toward an outside of the battery case and a second end toward an inside of the battery case, wherein the first end is covered by the lead film and is not covered by the sealing portion, and wherein a gas introduced into the getter unit is discharged in a Z-axis direction through the lead film on the first end of the getter unit, and wherein a gas permeability of the lead film is 20 barrer to 60 barrer at 60°C.

19. The method of manufacturing a battery cell of claim 18, wherein, The getter resin includes: at least one hygroscopic material selected from calcium oxide CaO, barium oxide BaO, lithium chloride LiCl, silicon dioxide SiO2, calcium Ca, and barium Ba; and a binder material including at least one selected from a polyolefin-based polymer, an acrylic-based polymer, and a fluorine-based polymer.

20. The method of manufacturing a battery cell of claim 18, wherein, The second end is not covered by the lead film and does not overlap with the sealing portion.

21. A battery module comprising the battery cell according to any one of claims 1 to 17.

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