Battery cell and battery module comprising the same

Abstract

A battery cell according to one embodiment of the present invention includes: a battery housing having electrode assemblies mounted on a storage portion and including a sealing portion therein with its outer periphery sealed; and a gas venting portion inserted into the sealing portion. The gas venting portion protrudes from the interior of the battery housing toward the exterior of the battery housing. The gas venting portion includes a non-adhesive layer and an adhesive layer located on the non-adhesive layer, the non-adhesive layer and the adhesive layer being bent in a direction toward an internal opening of the battery housing.

Description

Technical Field

[0001] This disclosure relates to a battery cell and a battery module including the battery cell, and more specifically, to a battery cell and a battery module including the battery cell capable of suppressing moisture penetration into the battery cell while improving the external discharge of gases generated inside the battery cell. This application claims priority to Korean Patent Application No. 10-2021-0066462, filed in Korea on May 24, 2021, which is incorporated herein by reference. Background Technology

[0002] With technological advancements and increasing demand for mobile devices, the need for secondary batteries as an energy source is rapidly growing. Specifically, secondary batteries are attracting significant interest 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 propulsion systems such as electric bicycles, electric vehicles, and hybrid vehicles.

[0003] Based on the shape of the battery casing, these secondary batteries are classified as follows: cylindrical 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-shaped casing of aluminum laminates. Here, the battery assembly contained in the battery casing is a power element that includes a positive electrode, a negative electrode, and a separator placed between the positive and negative electrodes and is capable of charging and discharging. It is classified as a wound core type in which long sheet-type positive and negative electrodes coated with active material are wound with a separator placed between them, and a stacked type in which multiple positive and negative electrodes are sequentially stacked with a separator placed between them.

[0004] Specifically, among these batteries, pouch batteries, which are stacked or stacked / folded battery assemblies contained in pouch battery housings made of aluminum laminates, are increasingly being used due to their low manufacturing cost, light weight, and ease of modification.

[0005] However, with the increase in battery cell energy density in recent years, a problem has emerged: the amount of gas generated inside the battery cell has also increased. Specifically, if the gas generated inside the battery cell is not easily vented, exhaust gas may occur within the battery cell due to gas generation. Furthermore, even if a separate exhaust section is included in the battery cell, moisture can still seep into the battery cell through this section, which may lead to battery performance degradation and the generation of additional gas due to the resulting side reactions. Therefore, there is an increasing need to develop battery cells that can prevent external moisture from seeping into the battery cell while improving the external exhaust of gases generated inside the battery cell. Summary of the Invention

[0006] Technical issues

[0007] This disclosure is designed to address the problems of the prior art, and therefore aims to provide a battery cell capable of suppressing external moisture penetration into the battery cell while improving the external discharge of gases generated inside the battery cell, as well as a battery module including the battery cell.

[0008] The purposes to be addressed in this disclosure are not limited to those described above, and those skilled in the art will clearly understand from this specification and the accompanying drawings that purposes not mentioned herein may be found elsewhere.

[0009] Technical solution

[0010] In one aspect of this disclosure, a battery cell is provided, the battery cell comprising: a battery housing having a receiving portion for mounting electrode assemblies and a sealing portion formed by sealing its outer periphery; and a gas venting portion inserted into the sealing portion, wherein the gas venting portion protrudes from the interior of the battery housing toward the exterior of the battery housing, the gas venting portion including a non-adhesive layer and an adhesive layer located on the non-adhesive layer, and the non-adhesive layer and the adhesive layer being bent toward an interior opening of the battery housing.

[0011] The non-adhesive layer may include a first non-adhesive layer and a second non-adhesive layer spaced apart from each other, and one end of the first non-adhesive layer adjacent to the outside of the sealing portion and one end of the second non-adhesive layer may be connected to each other and integrated.

[0012] The gas emission section may include an air inlet located between the first non-adhesive layer and the second non-adhesive layer, and the air inlet may face an internal opening of the battery casing.

[0013] The adhesive layer may include a first adhesive layer located on the upper surface of the first non-adhesive layer and a second adhesive layer located on the lower surface of the second non-adhesive layer, and one end of the first adhesive layer adjacent to the outside of the sealing portion and one end of the second adhesive layer may be connected to each other and integrated.

[0014] Based on the protruding direction of the gas emission portion, the first adhesive layer may extend along the side surface of the first non-adhesive layer, and the second adhesive layer may extend along the side surface of the second non-adhesive layer.

[0015] Based on the protruding direction of the gas emission section, the first adhesive layer and the second adhesive layer can extend between the first non-adhesive layer and the second non-adhesive layer, respectively.

[0016] A pair of first adhesive layers and a pair of second adhesive layers can be located on both sides of the air inlet.

[0017] The adhesive layer and the non-adhesive layer can have a structure in which the adhesive layer surrounds the lower surface and two side surfaces of the non-adhesive layer and around both ends of the upper surface of the non-adhesive layer, and the gas emission portion can have a structure in which the adhesive layer and the non-adhesive layer are folded based on the boundary line.

[0018] The non-adhesive layer can be a film made of non-adhesive materials.

[0019] Non-adhesive materials can be made from fluoropolymer materials.

[0020] Fluoropolymer materials can be at least one of polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polymethylpentene (TPX), fluorinated ethylene propylene (FEP), and perfluoroalkoxyalkane (PFA).

[0021] The adhesive layer may be made of an adhesive composition comprising at least one of a polyolefin-based material, an epoxy resin, and polyvinyl chloride (PVC).

[0022] The adhesive layer can be a film made of an adhesive composition.

[0023] The adhesive layer can be formed by applying an adhesive composition onto a non-adhesive layer.

[0024] The thickness of the adhesive layer can be equal to or less than the thickness of the non-adhesive layer.

[0025] At 60°C, the adhesive layer can have an air permeability of 20 to 60 bar.

[0026] At 60°C, the non-adhesive layer can have an air permeability of over 40 bar.

[0027] Under conditions of 25°C and 50% RH, the adhesive layer can have a moisture permeability of 0.02g to 0.2g over 10 years.

[0028] In another aspect of this disclosure, a battery module is also provided, which includes the aforementioned battery cell.

[0029] Technical effect

[0030] According to an embodiment, this disclosure provides a battery cell having the following structure: including a non-adhesive layer and an adhesive layer located on the non-adhesive layer, wherein the non-adhesive layer and the adhesive layer include bends toward an internal opening of the battery housing, and also provides a battery module including the battery cell, such that external discharge of gas generated inside the battery cell is increased, and the infiltration of moisture flowing inside the battery cell is suppressed.

[0031] According to this disclosure, since the gas generated inside the battery cell can be easily discharged to the outside through the gas discharge section, exhaust phenomena in the battery cell can be prevented, thereby improving the life of the battery cell.

[0032] According to this disclosure, since the gas is discharged through the gas emission section and the moisture does not penetrate into the battery cell, the battery performance of the battery cell can be prevented from deteriorating due to side reactions caused by moisture penetration, and the generation of additional gas can be prevented.

[0033] The effects of this disclosure are not limited to those described above, and those skilled in the art will clearly understand from this specification and the accompanying drawings the effects not mentioned herein. Attached Figure Description

[0034] Figure 1 This is a diagram illustrating a battery cell according to an embodiment of the present disclosure.

[0035] Figure 2 It is shown Figure 1 A three-dimensional view of the gas emission section.

[0036] Figure 3 It is along Figure 2 The cross-sectional view extracted from the cutting line AA′.

[0037] Figure 4 It is along Figure 2 The cross-sectional view extracted from the cutting line BB′.

[0038] Figure 5 It is along Figure 1 The cross-sectional view extracted from the cutting line aa′.

[0039] Figure 6 Is to show before folding Figure 2 A diagram showing the shape of the gas emission section. Detailed Implementation

[0040] In the following description, various embodiments of this disclosure will be detailed with reference to the accompanying drawings to facilitate implementation by those skilled in the art. This disclosure can be implemented in various different forms and is not limited to the embodiments described herein.

[0041] For clarity of this disclosure, parts unrelated to the specification have been omitted, and identical or similar parts are given the same reference numerals throughout the specification.

[0042] Furthermore, since the dimensions and thicknesses of the various components shown in the accompanying drawings are arbitrarily represented for ease of description, this disclosure is not necessarily limited to the drawings. Thicknesses have been exaggerated 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 explanation.

[0043] Additionally, throughout the specification, when a section "includes" a component, it means that other components may also be included, rather than excluding other components, unless otherwise mentioned.

[0044] Additionally, throughout the instruction manual, when "top view" is mentioned, it means viewing the target portion from above, while when "section view" is mentioned, it means viewing the target portion from the side with a vertical cut section.

[0045] Figure 1 This is a diagram illustrating a battery cell according to an embodiment of the present disclosure.

[0046] Reference Figure 1 According to an embodiment of the present disclosure, the battery cell 100 includes: a battery housing 200 having a receiving portion 210 for mounting an electrode assembly 110 and a sealing portion 250 formed by sealing its outer periphery; and a gas venting portion 500 inserted into the sealing portion 250.

[0047] The battery casing 200 may be a laminate comprising a resin layer and a metal layer. More specifically, the battery casing 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.

[0048] 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 them.

[0049] Electrode leads 300 are electrically connected to electrode connectors 115 included in electrode assembly 110 and protrude beyond battery housing 200 via sealing portions 250. Additionally, a lead film 400 is located at a portion corresponding to the sealing portion 250 in at least one of the upper and lower portions of the electrode lead 300. Therefore, the lead film 400 can improve the sealing performance of the sealing portions 250 and the electrode leads 300, while preventing short circuits in the electrode leads 300 during lamination.

[0050] The lead film 400 may have a wider width than the electrode lead 300. Here, the width of the lead film 400 refers to the maximum distance between one end of the lead film 400 and the other end in a direction orthogonal to the protruding direction of the electrode lead 300, while the width of the electrode lead 300 refers to the maximum distance between one end of the electrode lead 300 and the other end in a direction orthogonal to the protruding direction of the electrode lead 300. The lead film 400 may have a longer length than the sealing portion 250, but may have a shorter length than the electrode lead 300. Here, the length of the lead film 400 refers to the maximum distance between one end of the lead film and the other end in the protruding direction of the electrode lead 300, while the length of the sealing portion 250 refers to the maximum distance between one end of the sealing portion 250 and the other end in the protruding direction of the electrode lead. The length of the electrode lead 300 refers to the maximum distance between one end of the electrode lead 300 and the other end in the protruding direction of the electrode lead 300. Therefore, the lead film 400 can prevent the side surface of the electrode lead 300 from being exposed without interfering with the electrical connection of the electrode lead 300.

[0051] The gas venting portion 500 can be inserted into at least a portion of the sealing portion 250. Here, the gas venting portion 500 can be fused together with the sealing portion 250, and the gas venting portion 500 can be fixed via the sealing portion 250. For example, the gas venting portion 500 can be thermally fused and / or compressively fused together with the sealing portion 250.

[0052] More specifically, such as Figure 1 As shown, the gas venting portion 500 can be located in the outer periphery of the sealing portion 250, where the electrode lead 300 is not located. In other words, the gas venting portion 500 can be inserted into the sealing portion 250 adjacent to one side of the electrode assembly 110. Therefore, the gas venting portion 500 can be manufactured very simply, and a sufficient gas venting path can be ensured through the gas venting portion 500 without affecting the electrical connection of the electrode lead 300.

[0053] As another example, although not specifically shown in the accompanying drawings, the gas emission portion 500 may be located within the outer periphery of the sealing portion 250 where the electrode lead 300 is located. In other words, the gas emission portion 500 may be located within the same outer periphery as the electrode lead 300, but spaced apart from it. Therefore, since the gas emission portion 500 and the electrode lead 300 protrude in the same direction, it is advantageous to further improve the space efficiency of the battery cell 100.

[0054] The gas emission section 500 will be described in more detail below.

[0055] Figure 2 It is shown Figure 1 A three-dimensional view of the gas emission section. Figure 3 It is along Figure 2 The cross-sectional view extracted from the cutting line AA′. Figure 4 It is along Figure 2 The cross-sectional view extracted from the cutting line BB′.

[0056] Reference Figure 1 The gas vent portion 500 can protrude from the inside of the battery housing 200 toward the outside of the battery housing 200. More specifically, the gas vent portion 500 can protrude from the inside of the battery housing 200 toward the outside of the battery housing 200 via the sealing portion 250.

[0057] Reference Figures 1 to 4 The gas emission portion 500 includes a non-adhesive layer 530 and an adhesive layer 510 located on the non-adhesive layer 530, and the non-adhesive layer 530 and the adhesive layer 510 are bent to open toward the interior of the battery housing 200. Here, the gas emission portion 500 may have a structure in which the adhesive layer 510 surrounds the outer surface of the non-adhesive layer 530. That is, the inner surface of the gas emission portion 500 may be formed as the non-adhesive layer 530, and the outer surface of the gas emission portion 500 may be formed as the adhesive layer 510.

[0058] Here, adhesive layer 510 can refer to an adhesive layer that can be adhered by thermal melting and / or pressure melting. Additionally, non-adhesive layer 53 can refer to a non-adhesive layer that cannot be adhered by thermal melting and / or pressure melting.

[0059] Therefore, since the adhesive layer 510 is located on the outer surface of the gas emission portion 500, the sealing degree between the gas emission portion 500 and the sealing portion 250 can be improved.

[0060] Reference Figures 1 to 4 The non-adhesive layer 530 includes a first non-adhesive layer 531 and a second non-adhesive layer 535 spaced apart from each other. Here, one end of the first non-adhesive layer 531 and one end of the second non-adhesive layer 535 adjacent to the outer side of the sealing portion 250 can be connected to each other and integrated. That is, the ends of the first non-adhesive layer 531 and the second non-adhesive layer 535 opposite to their connected ends are spaced apart from each other, such that one surface of the non-adhesive layer 530 can be open toward the interior of the battery housing 200.

[0061] Reference Figure 2 and Figure 3The gas emission section 500 may include an air inlet 550 located between the first non-adhesive layer 531 and the second non-adhesive layer 535. Here, the air inlet 550 may open toward the interior of the battery housing 200. More specifically, the air inlet 550 may refer to the space spaced apart between the first non-adhesive layer 531 and the second non-adhesive layer 535.

[0062] Therefore, in the battery cell 100 according to this embodiment, since the air inlet 550 is formed on a surface of the gas discharge section 500 located inside the battery housing 200, the gas generated inside the battery cell 100 can be easily introduced into the gas discharge section 500.

[0063] Reference Figures 1 to 3 The adhesive layer 510 includes a first adhesive layer 511 located on the upper surface of the first non-adhesive layer 531 and a second adhesive layer 515 located on the lower surface of the second non-adhesive layer 535. Here, one end of the first adhesive layer 511 and one end of the second adhesive layer 515 adjacent to the outer side of the sealing portion 250 can be connected to each other and integrated. That is, the adhesive layer 510 can extend along the outer surface of the non-adhesive layer 530, and one surface of the adhesive layer 510 can face the internal opening of the battery housing 200.

[0064] Reference Figure 2 Based on the protruding direction of the gas emission section 500, the first adhesive layer 511 may extend along the side surface of the first non-adhesive layer 531, and the second adhesive layer 515 may extend along the side surface of the second non-adhesive layer 535. More specifically, the first adhesive layer 511 may extend along both side surfaces of the first non-adhesive layer 531, and the second adhesive layer 515 may extend along both side surfaces of the second non-adhesive layer 535.

[0065] Therefore, in the gas emission section 500, the side surface of the non-adhesive layer 530 can be covered by the adhesive layer 510, so that the non-adhesive layer 530 is not exposed. In other words, it can prevent moisture from the outside of the battery cell 100 from penetrating into the battery cell 100 through the non-adhesive layer 530.

[0066] Reference Figure 2 and Figure 4 Based on the protruding direction of the gas emission section 500, the first adhesive layer 511 and the second adhesive layer 515 can extend between the first non-adhesive layer 531 and the second non-adhesive layer 535, respectively. In other words, the first adhesive layer 511 can extend at both ends of the lower surface of the first non-adhesive layer 531, and the second adhesive layer 515 can extend at both ends of the upper surface of the second non-adhesive layer 535.

[0067] Here, the adhesive layer 510 may not be formed in the central portion of the lower surface of the first non-adhesive layer 531 and the upper surface of the second non-adhesive layer 535. That is, the air inlet 550 is formed in the central portion of the lower surface of the first non-adhesive layer 531 and the upper surface of the second non-adhesive layer 535, and a pair of first adhesive layers 511 and a pair of second adhesive layers 515 may be located on both sides of the air inlet 550. In this case, the pair of first adhesive layers 511 and the pair of second adhesive layers 515 located on both sides of the air inlet 550 may adhere to each other when fused with the sealing portion 250.

[0068] Therefore, since the gas discharge section 500 includes adhesive layers 510 formed on both sides of the air inlet 550, the height of the air inlet 550 can be relatively increased, and the sealing strength of the gas discharge section 500 is increased, so gas can be easily introduced and discharged through the air inlet 550.

[0069] Furthermore, the width of the air intake 550 can be adjusted by adjusting the length of the adhesive layers 510 formed on both sides of the air intake 550. Here, the length of the adhesive layer 510 refers to the maximum distance between one end of the adhesive layer 510 and the other end in a direction orthogonal to the protruding direction of the gas exhaust portion 500. The width of the air intake 550 refers to the maximum distance between one end of the air intake 550 and the other end in a direction orthogonal to the protruding direction of the gas exhaust portion 500.

[0070] Therefore, when the length of the adhesive layer 510 formed on both sides of the air inlet 550 is relatively small, the width of the air inlet 550 can be relatively large, making it easier for gas to be introduced and discharged through the air inlet 550. In addition, when the length of the adhesive layer 510 formed on both sides of the air inlet 550 is relatively long, the sealing of the gas discharge section 500 can be further improved.

[0071] Here, the non-adhesive layer 530 can be a film made of a non-adhesive material. For example, the non-adhesive material can be formed from a fluoropolymer material. The fluoropolymer material can be at least one of polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polymethylpentene (TPX), fluorinated ethylene propylene (FEP), and perfluoroalkoxyalkanes (PFA). However, it is not limited to this, and in this embodiment, it can include any material having a relatively high melting point and therefore not dissolving during melting with the sealing portion 250. Fluoropolymer materials are advantageous for moisture resistance and have breathable properties. In addition, it is a material that is stable in the environment within the battery cell 100. For example, it is a material that does not react with the electrolyte contained in the battery cell 100.

[0072] In one embodiment of this disclosure, at 60°C, the air permeability of the non-adhesive layer 530 can be 40 bar or higher. For example, the carbon dioxide permeability of the non-adhesive layer 530 can meet the above range.

[0073] In one embodiment of this disclosure, the non-adhesive layer 530 may be made of a fluoropolymer material. The fluoropolymer material may be at least one of polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polymethylpentene (TPX), fluorinated ethylene propylene (FEP), and perfluoroalkoxyalkanes (PFA), as described above. For example, the fluoropolymer material may be at least one of polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polymethylpentene (TPX), fluorinated ethylene propylene (FEP), and perfluoroalkoxyalkanes (PFA) that satisfies the above-described air permeability and / or moisture permeability.

[0074] Here, the adhesive layer 510 may be made of an adhesive composition containing at least one of a polyolefin-based material, an epoxy resin, and polyvinyl chloride (PVC). For example, the polyolefin-based material may be polyethylene (PE), polypropylene (PP), etc. However, the invention is not limited thereto, and any material that melts and adheres to the sealing portion 250 may be included in this embodiment.

[0075] The adhesive layer 510 can have a lower melting point than the non-adhesive layer 530. Therefore, the sealing performance can be further improved.

[0076] In embodiments of this disclosure, at 60°C, the air permeability of the adhesive layer 510 can be between 20 and 60 bar, or between 30 and 40 bar. For example, the carbon dioxide permeability of the adhesive layer 510 can meet the above range. Furthermore, based on the thickness of the adhesive layer 510 being 200 μm, the air permeability at 60°C can meet the above range. When the air permeability of the adhesive layer 510 meets the above range, the gas generated inside the secondary battery can be discharged more effectively.

[0077] In this specification, air permeability can be measured using ASTM F2476-20.

[0078] In one embodiment of this disclosure, under conditions of 25°C and 50% RH, the moisture permeability of the adhesive layer 510 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 adhesive layer 510 meets the above ranges, moisture penetration introduced from the adhesive layer 510 can be prevented more effectively.

[0079] In one embodiment of this disclosure, the adhesive layer 510 can have an air permeability of 20 to 60 bar 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 air permeability and moisture permeability of the adhesive layer 510 meet the above ranges, moisture can be more effectively prevented from penetrating from the outside while discharging the gas generated inside the secondary battery.

[0080] The moisture permeability of adhesive layer 510 can be measured using the ASTM F 1249 method. In this case, MCOON-certified equipment can be used to measure the moisture permeability.

[0081] In one embodiment of this disclosure, the adhesive layer 510 may be made of an adhesive composition comprising at least one of a polyolefin-based material, an epoxy resin, and polyvinyl chloride (PVC), wherein the polyolefin-based material may be polyethylene (PE), polypropylene (PP), etc., as described above. For example, the adhesive layer 510 may be polyethylene (PE), polypropylene (PP), etc., that satisfy the above-mentioned air permeability and / or moisture permeability.

[0082] In addition, since the adhesive layer 510 is made of the above materials, the airtightness of the battery cell 100 can be maintained and internal electrolyte leakage can be prevented.

[0083] Alternatively, the adhesive layer 510 can be a film made of an adhesive composition. Furthermore, the adhesive layer 510 can be formed by coating the non-adhesive layer with the adhesive composition. However, the shape of the adhesive layer 510 is not limited to this, and any shape that can easily surround the outer surface of the non-adhesive layer 530 can be used without limitation.

[0084] Therefore, as Figures 2 to 4 As shown, since the gas emission section 500 has a structure in which the adhesive layer 510 made of the above-mentioned materials becomes the outer surface of the gas emission section 500, the adhesive layer 510 can be melted and adhered to the sealing section 250. Furthermore, the non-adhesive layer 530 made of the above-mentioned materials is located inside the gas emission section 500, and the first non-adhesive layer 531 and the second non-adhesive layer 535, which face each other, do not melt together. Therefore, the interior of the gas emission section 500 can be used as a gas emission channel. In addition, the non-adhesive layer 530 made of the above-mentioned materials can prevent moisture from outside the battery cell 100 from penetrating into the battery cell 100, while improving the external emission of gases generated inside the battery cell 100.

[0085] In addition, the gas emission section 500 with the above structure is designed to be easily inserted when assembling the battery cell 100, so that battery cells with new structures can be assembled while maintaining the existing battery cell manufacturing process.

[0086] The thickness of the adhesive layer 510 can be equal to or less than the thickness of the non-adhesive layer 530. More specifically, the adhesive layer 510 can have a thickness of 0.1 μm or more and 100 μm or less. More specifically, the adhesive layer 510 can have a thickness of 0.5 μm or more and 90 μm or less. For example, the adhesive layer 510 can have a thickness of 1 μm or more and 80 μm or less. Additionally, the non-adhesive layer 530 can have a thickness of 10 μm or more and 500 μm or less. More specifically, the non-adhesive layer 530 can have a thickness of 15 μm or more and 450 μm or less. For example, the non-adhesive layer 530 can have a thickness of 20 μm or more and 400 μm or less.

[0087] Therefore, since the adhesive layer 510 can have a thickness within the above range, the influence of the non-adhesive layer 530 on the gas emission of the gas emission section 500 can be minimized while maintaining the sealing strength between the gas emission section 500 and the sealing section 250. Furthermore, since the non-adhesive layer 530 can have a thickness within the above range, gas introduced through the air inlet 550 can be easily discharged through the non-adhesive layer 530, while suppressing the infiltration of moisture flowing within the battery cell 100.

[0088] However, if the thickness of the adhesive layer 510 is less than 0.1 μm or greater than 100 μm, the seal strength between the gas emission portion 500 and the sealing portion 250 is too weak, or the adhesive layer 510 prevents gas emission from the gas emission portion 500. Additionally, when the thickness of the non-adhesive layer 530 is less than 10 μm or greater than 500 μm, the area of ​​the non-adhesive layer 530 can be reduced to excessively reduce the amount of gas emission or excessively increase the thickness of the gas emission portion 500.

[0089] Figure 5 It is along Figure 1 The cross-sectional view extracted from the cutting line aa′.

[0090] Reference Figure 2 and Figure 5 In the battery cell 100 according to an embodiment of the present disclosure, one surface of the gas emission portion 500 opens toward the interior of the battery housing 200, and the adhesive layer 510 becomes the outer surface of the gas emission portion 500, so that the adhesive layer 510 and the sealing portion 250 can contact each other. Additionally, the non-adhesive layer 530 can become the inner surface of the gas emission portion 500, and the air inlet 550 can be formed between the first non-adhesive layer 531 and the second non-adhesive layer 535.

[0091] Therefore, in this embodiment, in the gas emission section 500, the gas inside the battery cell 100 can be introduced into the air inlet 550 formed between the non-adhesive layers 530. Furthermore, the gas introduced into the air inlet 550 can pass through the adhesive layer 510 and the non-adhesive layer 530 according to the pressure difference with the outside of the battery casing 200, and the gas introduced into the air inlet 550 can be discharged to the outside.

[0092] Figure 6 It is shown before folding Figure 2 A diagram showing the shape of the gas emission section.

[0093] Reference Figure 2 and Figure 6 In another embodiment of the battery cell 100 according to this disclosure, the gas emission portion 500 may have a structure in which the adhesive layer 510 and the non-adhesive layer 530 are folded. More specifically, the adhesive layer 510 and the non-adhesive layer 530 may have a structure in which the adhesive layer 510 surrounds the lower surface and two side surfaces of the non-adhesive layer 530 and surrounds both ends of the upper surface of the non-adhesive layer 530. Here, in the gas emission portion 500, the adhesive layer 510 and the non-adhesive layer 530 may be folded based on a boundary line CC′. As an example, the boundary line CC′ may correspond to a centerline based on the longitudinal direction of the adhesive layer 510 and the non-adhesive layer 530.

[0094] Furthermore, the area on the upper surface of the non-adhesive layer 530 where the adhesive layer 510 is not formed can have, for example ... Figure 6 The rectangular shape shown can be a shape with various patterns such as circles or ovals.

[0095] In the manufacturing method of the gas emission section 500, the non-adhesive layer 530 is disposed approximately at the center of the adhesive layer 510, such that all surfaces of the non-adhesive layer 530 except for the two surfaces of the non-adhesive layer 530 are covered by the adhesive layer 510, and the two ends of the adhesive layer 510 are folded over the non-adhesive layer 530 to form a shape as shown in the figure. Figure 6 The state is shown. Then, folding is performed based on the CC′ boundary line, and the adhesive layers 510 on the folded side are adhered to each other by thermal melting or pressure melting. At this time, a non-adhesive internal space is formed between the folded non-adhesive layers 530, thereby providing an air inlet 550.

[0096] Therefore, the gas emission section 500 according to this embodiment can be formed by folding based on a predetermined boundary line, so the manufacturing process can be relatively easy and the manufacturing cost can be simplified.

[0097] Additionally, 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.

[0098] 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 vehicles, and hybrid vehicles, 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 this disclosure.

[0099] This disclosure has been described in detail. However, it should be understood that while the detailed description and specific examples indicate preferred embodiments of this disclosure, they are given by way of example only, as various variations and modifications within the scope of this disclosure will be apparent to those skilled in the art based on the detailed description.

Claims

1. A battery cell, the battery cell comprising: A battery housing having a receiving portion for mounting electrode assemblies and a sealing portion formed by sealing the outer periphery of the receiving portion; as well as A gas discharge section is inserted into the sealing section. The gas emission portion protrudes from the inside of the battery casing toward the outside of the battery casing. The gas emission section includes a non-adhesive layer and an adhesive layer located on the non-adhesive layer, and the non-adhesive layer and the adhesive layer are bent toward an internal opening in the battery casing. The non-adhesive layer comprises a first non-adhesive layer and a second non-adhesive layer spaced apart from each other, and The ends of the first non-adhesive layer and the second non-adhesive layer, which are adjacent to the outer side of the sealing portion, are connected to each other and integrated. The adhesive layer and the non-adhesive layer have a structure in which the adhesive layer surrounds the lower surface and two side surfaces of the non-adhesive layer and surrounds the two ends of the upper surface of the non-adhesive layer. The gas emission section has a structure in which the adhesive layer and the non-adhesive layer are folded based on a boundary line perpendicular to the side surface, thereby providing a non-adhesive internal space formed between the folded non-adhesive layers, thus providing an air inlet located between the first non-adhesive layer and the second non-adhesive layer and facing the internal opening of the battery housing. The non-adhesive layer is made of a non-adhesive material, which is made of a fluoropolymer material. The adhesive layer is made of an adhesive composition, which is composed of at least one of a polyolefin-based material, an epoxy resin, and polyvinyl chloride (PVC).

2. The battery cell according to claim 1, in, The gas emission section adjusts the width of the air inlet by adjusting the length of the adhesive layer formed on both sides of the air inlet.

3. The battery cell according to claim 1, in, The adhesive layer includes a first adhesive layer located on the upper surface of the first non-adhesive layer and a second adhesive layer located on the lower surface of the second non-adhesive layer. The ends of the first adhesive layer adjacent to the outer side of the sealing portion and the ends of the second adhesive layer are connected to each other and integrated.

4. The battery cell according to claim 3, in, Based on the protruding direction of the gas emission portion, the first adhesive layer extends along the side surface of the first non-adhesive layer, and the second adhesive layer extends along the side surface of the second non-adhesive layer.

5. The battery cell according to claim 4, in, Based on the protruding direction of the gas emission portion, the first adhesive layer and the second adhesive layer extend between the first non-adhesive layer and the second non-adhesive layer, respectively.

6. The battery cell according to claim 5, in, A pair of first adhesive layers and a pair of second adhesive layers are located on both sides of the air inlet.

7. The battery cell according to claim 1, in, The non-adhesive layer is a film made of the non-adhesive material.

8. The battery cell according to claim 1, in, The fluoropolymer material is at least one of polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polymethylpentene (TPX), fluorinated ethylene propylene (FEP), and perfluoroalkoxyalkane (PFA).

9. The battery cell according to claim 1, in, The adhesive layer is a film made from the adhesive composition.

10. The battery cell according to claim 1, in, The adhesive layer is formed by applying the adhesive composition onto the non-adhesive layer.

11. The battery cell according to claim 1, in, The thickness of the adhesive layer is equal to or less than the thickness of the non-adhesive layer.

12. The battery cell according to claim 1, in, At 60°C, the adhesive layer has a breathability of 20 to 60 bar.

13. The battery cell according to claim 1, in, At 60°C, the non-adhesive layer has an air permeability of more than 40 bar.

14. The battery cell according to claim 1, in, Under conditions of 25°C and 50% RH, the adhesive layer has a moisture permeability of 0.02g to 0.2g over 10 years.

15. The battery cell according to claim 1, in, The gas emission portion protrudes from the inside of the battery housing toward the outside of the battery housing via the sealing portion.

16. The battery cell according to claim 1, in, The inner surface of the gas emission portion is formed as the non-adhesive layer, and the outer surface of the gas emission portion is formed as the adhesive layer.

17. A battery module comprising a battery cell according to any one of claims 1 to 16.

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