Lead assembly, battery cell, and battery module system

Abstract

A lead assembly, according to an embodiment of the present invention, may be sealed in a pouch-type exterior material. The lead assembly may comprise: an electrode lead made of a metal material; and a lead film made of an insulating material and covering the electrode lead. The lead film may comprise: a metal adhesion layer contacting the electrode lead; a pouch adhesion layer contacting the innermost layer of the exterior material; a core layer positioned between the metal adhesion layer and the pouch adhesion layer; and an anti-adhesion film positioned between the metal adhesion layer and the core layer and / or between the pouch adhesion layer and the core layer.

Description

Lead assembly, battery cell, and battery module system

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0191013 filed on December 19, 2024, and all contents disclosed in the document of said Korean Patent Application are incorporated herein as part of this specification.

[0003] Technology field

[0004] The present invention relates to a lead assembly in which a lead film is coupled to an electrode lead, a pouch-type battery cell comprising the lead assembly, and a battery module system comprising a plurality of the battery cells.

[0005] With the technological development and increasing demand for mobile devices, the demand for secondary batteries as an energy source is rapidly rising. Accordingly, extensive research is being conducted on secondary batteries capable of meeting various requirements.

[0006] Secondary batteries are attracting significant attention as an energy source not only for mobile devices such as mobile phones, digital cameras, and laptops, but also for power units such as electric bicycles, electric vehicles, and hybrid electric vehicles.

[0007] Recently, with the increasing need for large-capacity secondary battery structures, including their utilization as energy storage sources, there is a growing demand for medium-to-large modular battery packs that aggregate battery modules in which multiple secondary batteries are connected in series or parallel.

[0008] Meanwhile, when configuring a battery pack by connecting multiple battery cells in series or parallel, it is common practice to form a battery module consisting of at least one battery cell and to construct the battery pack by adding other components using at least one battery module. The battery cells included in such medium-to-large battery modules are capable of charging and discharging, and generate a large amount of heat during the charging and discharging process.

[0009] Accordingly, a configuration for cooling the battery cells within the battery module is required. For example, a method of circulating insulating oil within the battery module may be considered. However, when insulating oil, particularly hydrocarbon-based insulating oil, is used as a refrigerant, there is a risk of it penetrating into the interior of the battery cell through the lead film. Therefore, a method to prevent or delay the penetration of insulating oil is required.

[0010] One problem that the present invention aims to solve is to provide a lead assembly capable of delaying the penetration of insulating oil and a battery cell including the same.

[0011] Another problem that the present invention aims to solve is to provide a battery module system comprising a plurality of the battery cells.

[0012] A lead assembly according to an embodiment of the present invention may be sealed in a pouch-type outer casing. The lead assembly may include an electrode lead made of a metal material; and a lead film having an insulating material that surrounds the electrode lead. The lead film may include a metal adhesive layer in contact with the electrode lead; a pouch adhesive layer in contact with the innermost layer of the outer casing; a core layer located between the metal adhesive layer and the pouch adhesive layer; and an anti-adhesion film located between the metal adhesive layer and the core layer and / or between the pouch adhesive layer and the core layer.

[0013] The above anti-adhesion film may be made of polytetrafluoroethylene (PTFE).

[0014] The above anti-adhesion film can be extended in the width direction of the electrode lead.

[0015] The length dimension of the above anti-adhesion film may be smaller than the width dimension of the above electrode lead.

[0016] With respect to the longitudinal direction of the electrode lead, the distance to one edge of the lead film relative to the anti-adhesion film may be closer than the distance to the other edge of the lead film.

[0017] The above anti-adhesion film may be placed on one or both sides of the electrode lead.

[0018] A battery cell according to an embodiment of the present invention may include: an electrode assembly; a pouch-type outer casing that accommodates the electrode assembly; an electrode lead connected to the electrode assembly and protruding outside the outer casing and having a metal material; and a lead film that surrounds the electrode lead and insulates the outer casing and the electrode lead. The lead film may include: a metal adhesive layer that adheres to the electrode lead; a pouch adhesive layer that adheres to the innermost layer of the outer casing; a core layer located between the metal adhesive layer and the pouch adhesive layer; and an anti-adhesion film located between the metal adhesive layer and the core layer and / or between the pouch adhesive layer and the core layer.

[0019] The lead film may include a first region that overlaps with the exterior material; and a second region that protrudes outwardly from the exterior material. The anti-adhesion film may be located in the second region.

[0020] The above anti-adhesion film can be extended in the width direction of the electrode lead.

[0021] The length dimension of the above anti-adhesion film may be smaller than the width dimension of the above electrode lead.

[0022] With respect to the longitudinal direction of the electrode lead, the distance to the outer edge of the lead film relative to the anti-adhesion film may be closer than the distance to the inner edge of the lead film.

[0023] The above anti-adhesion film may be placed on one or both sides of the electrode lead.

[0024] Insulating oil can be trapped in the gap formed inside the lead film by the above anti-adhesion film.

[0025] A battery module system according to an embodiment of the present invention may include a battery module in which a plurality of battery cells are accommodated in a housing; and a circulation system for circulating insulating oil into the interior of the battery module. The battery cell may include an electrode assembly; a pouch-type outer casing that accommodates the electrode assembly; an electrode lead connected to the electrode assembly and protruding outside the outer casing, having a metal material; and a lead film that surrounds the electrode lead and insulates the outer casing from the electrode lead. The lead film may include a metal adhesive layer that adheres to the electrode lead; a pouch adhesive layer that adheres to the innermost layer of the outer casing; a core layer located between the metal adhesive layer and the pouch adhesive layer; and an anti-adhesion film located between the metal adhesive layer and the core layer and / or between the pouch adhesive layer and the core layer.

[0026] According to a preferred embodiment of the present invention, a gap formed by an anti-adhesion film may be formed inside the lead film, and said gap may trap insulating oil inside. By doing so, it is possible to delay or prevent insulating oil for cooling the battery cell from penetrating into the interior of the battery cell through the lead film.

[0027] In addition to this, the configurations according to the preferred embodiments of the present invention may include effects that are easily predictable by those skilled in the art.

[0028] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0029] FIG. 1 is a schematic diagram of a battery module system according to one embodiment of the present invention.

[0030] Figure 2 is an exploded perspective view of the battery module shown in Figure 1.

[0031] FIG. 3 is an exploded perspective view of a battery cell according to one embodiment of the present invention.

[0032] FIG. 4 is a cross-sectional view illustrating the interior of a battery cell according to one embodiment of the present invention.

[0033] Figure 5 is a plan view of the lead assembly shown in Figure 4.

[0034] FIG. 6 is an enlarged cross-sectional view of a lead assembly according to one embodiment of the present invention.

[0035] FIG. 7 is an enlarged cross-sectional view of a lead assembly according to another embodiment of the present invention.

[0036] Hereinafter, preferred embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited or restricted by the following embodiments.

[0037] In order to clearly explain the present invention, detailed descriptions of related prior art that are irrelevant to the explanation or that may unnecessarily obscure the essence of the invention have been omitted. Furthermore, when assigning reference numerals to the components of each drawing in this specification, identical or similar reference numerals are assigned to identical or similar components throughout the entire specification.

[0038] Furthermore, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0039] Each component of a secondary battery according to one embodiment of the present invention is schematically illustrated in the drawing, and the size or thickness of the lines of the components may be expressed somewhat exaggerated for ease of understanding.

[0040] FIG. 1 is a schematic diagram of a battery module system according to one embodiment of the present invention, and FIG. 2 is an exploded perspective view of the battery module shown in FIG. 1.

[0041] A battery module system according to one embodiment of the present invention may include a battery module (10) and a circulation system (20).

[0042] The battery module (10) may include a housing (200) and a plurality of battery cells (100) that are accommodated within the housing (200) and stacked side by side with each other.

[0043] The housing (200) can form the exterior of the battery module (10). The housing (200) can have a metal material with high strength.

[0044] The structure of the housing (200) may vary. For example, the housing (200) may be a monoframe. The monoframe may be a metal plate with an integrated top surface, bottom surface, and both sides. As another example, the housing (200) may have a structure in which a U-shaped frame and an upper plate (top surface) are combined. The U-shaped frame may be a metal plate in which a lower plate (bottom surface) and side plates (both sides) are combined or integrated. In addition, the structure of the housing (200) may be provided as a structure in which L-shaped frames are combined, or may be provided as various structures not described in the above examples.

[0045] The housing (200) may have an internal space, and a plurality of battery cells (100) may be accommodated in the internal space. Both ends of the housing (200) in the electric direction may be open and may be covered by an end cover (400) to be described later.

[0046] Each battery cell (100) may be a pouch-type battery cell. Since the number of layers per unit area can be maximized in a pouch-type battery cell, the energy density of the battery module (10) can be increased. The battery cell (100) may be manufactured by housing an electrode assembly (110) (see FIG. 3) including a positive electrode, a negative electrode, and a separator in an outer material (120) formed from a laminate sheet, and then sealing the outer material (120) by heat-fusing it. This will be explained in detail later.

[0047] Multiple battery cells (100) can be stacked in a direction parallel to the width direction of the housing (200). Each battery cell (100) can be arranged in a direction parallel to the length direction of the housing (200).

[0048] Each battery cell (100) may be provided with a pair of electrode leads (112). The pair of electrode leads (112) may protrude in opposite directions and may protrude parallel to the length direction of the battery cell (100). However, this is not limited thereto, and it is also possible for the pair of electrode leads (112) to protrude parallel to each other in the same direction.

[0049] The battery module (10) may include a busbar frame (300) and an end cover (400).

[0050] A busbar frame (300) may be positioned on both sides in the longitudinal direction of a plurality of battery cells (100). At least one busbar (310) may be mounted on the busbar frame (300), and each busbar (310) may be connected to an electrode lead (112) of a battery cell (100). The busbar (310) may be configured to electrically connect the plurality of battery cells (100) to an external load.

[0051] The busbar (310) can be mounted on the outer side of the busbar frame (300). In this regard, a through hole may be formed in the busbar frame (300) and the busbar (310) through which the electrode lead (112) of the battery cell (100) passes, and the electrode lead (112) may be folded after passing through the through hole and connected to the busbar (310).

[0052] The end cover (400) can be coupled to the housing (200). The end cover (400) can cover both open ends of the housing (200). More specifically, the end cover (400) may include a first end cover (400A) covering one end of the housing (200) and a second end cover (400B) covering the other end of the housing (200).

[0053] An opening (400H) is formed in each end cover (400), and an electrical connection of the bus bar (310) can be made through the opening (400H).

[0054] Meanwhile, the circulation system (20) can circulate insulating oil into the interior of the battery module (10). That is, the circulation system (20) can circulate insulating oil as a refrigerant into the housing (20) to cool a plurality of battery cells (100).

[0055] Since the insulating oil has insulating properties, it can prevent electrical malfunction of the battery module (10). More specifically, the insulating oil may be a hydrocarbon-based insulating oil. It is widely known that insulating oil is used for insulation and cooling of electrical devices such as transformers, and since the types and physical properties of such insulating oil are well-known technology, a detailed description is omitted.

[0056] The circulation system (20) may include a pump (21) for circulating insulating oil, a cooling unit (22) for cooling insulating oil, an inlet (23) through which insulating oil flows into a housing (200), and an outlet (24) through which insulating oil flows out of the housing (200).

[0057] The cooling unit (22) may be located outside the housing (200). The cooling unit (22) can cool the insulating oil whose temperature has risen by absorbing heat from a plurality of battery cells (100) inside the housing (200). The type of cooling unit (22) is not limited. For example, the cooling unit (22) may include a fan or a blower that blows air toward the insulating oil passing through the pipe. In addition, for efficient cooling, cooling fins may be provided in the pipe passing through the cooling unit (22).

[0058] The inlet (23) and outlet (24) can be connected to the battery module (10). More specifically, the inlet (23) can be connected to one side in the longitudinal direction of the battery module (10), and the outlet (24) can be connected to the other side in the longitudinal direction of the battery module (10). Thus, insulating oil flowing into the battery module (10) through the inlet (23) can be discharged through the outlet (24) after passing through the longest possible path inside the battery module (10). In this way, cooling of multiple battery cells (100) can be effectively achieved.

[0059] For example, as shown in FIG. 1, the inlet (23) may be connected to the first end cover (400A) and the outlet (24) may be connected to the second end cover (400B). In this case, a connection hole (10a) to which the inlet (23) or outlet (24) is connected may be formed in each end cover (400).

[0060] However, it is not limited to this, and as long as the structure allows for cooling of multiple battery cells (100) by insulating oil, the method of connecting the battery module (10) and the circulation system (20) is not limited. For example, it may be possible for the inlet (23) to be connected to one side in the longitudinal direction of the housing (200) and the outlet (24) to be connected to the other side in the longitudinal direction of the housing (200).

[0061] The operation of this circulation system (20) is described. By means of a pump (21), insulating oil is introduced into the battery module (10) through an inlet (23), cools multiple battery cells (100), and can be discharged to the outside of the battery module (10) through an outlet (24). Subsequently, the insulating oil is cooled by a cooling unit (22) located outside the housing (200) and can be reintroduced into the battery module (10) through an inlet (23). By circulating insulating oil by repeating this process, multiple battery cells (100) can be continuously cooled.

[0062] FIG. 3 is an exploded perspective view of a battery cell according to one embodiment of the present invention, and FIG. 4 is a cross-sectional view showing the interior of a battery cell according to one embodiment of the present invention.

[0063] The battery cell (100) may include an electrode assembly (110) and an outer casing (120).

[0064] The electrode assembly (110) may be formed by interposing a separator between alternately arranged positive and negative electrodes. That is, the electrode assembly (110) may include a plurality of electrodes and a separator interposed between the plurality of electrodes to insulate the plurality of electrodes from each other. The electrode assembly (110) may be accommodated in an outer casing (120), more specifically in a storage portion (121) to be described later.

[0065] The electrode assembly (110) may be a stack type, a jelly roll type, a stack and folding type, etc., and the type of electrode assembly (110) is not limited.

[0066] The electrode assembly (110) may include electrode tabs (110a) connected to a positive electrode and a negative electrode, respectively, and the electrode tabs (110a) may serve as a path through which electrons can move between the inside and outside of the electrode assembly (110). The electrode tabs (110a) may include a positive electrode tab connected to a positive electrode and a negative electrode tab connected to a negative electrode. The positive electrode tab and the negative electrode tab may protrude from the electrode assembly (110) in different directions, but are not limited thereto and may be formed to protrude in various directions, such as protruding in parallel from one side in the same direction.

[0067] The battery cell (100) may further include a lead assembly (111).

[0068] A lead assembly (111) according to an embodiment of the present invention may include an electrode lead (112) made of a metal material and a lead film (113) having an insulating material that surrounds the electrode lead (112).

[0069] The electrode lead (112) can be connected to the electrode assembly (110), more specifically to the electrode tab (110a). The electrode lead (112) can electrically connect the electrode assembly (110) to an external load.

[0070] One end of the electrode lead (112) is connected to the electrode tab (110a), and the other end may protrude outside the outer casing (120). The electrode lead (112) may include a positive lead connected to the positive tab and a negative lead connected to the negative tab. Since the positive tab and the negative tab are each formed to protrude in various directions, the positive lead and the negative lead may also extend in various directions.

[0071] The lead film (113) can surround a portion of the electrode lead (112). The lead film (113) may have an insulating material. Generally, insulating tape, which is easy to attach to the electrode lead (112) and has a relatively thin thickness, is often used as the lead film (113), but it is not limited to this.

[0072] The lead film (113) can be positioned to correspond to the first terrace portion (122) of the outer material (120) to be described later. Accordingly, the lead film (113) can insulate the electrode lead (112) and the first terrace portion (122).

[0073] The outer material (120) can be formed by molding a laminate sheet and can accommodate an electrode assembly (110) inside. That is, the outer material (120) can be a pouch-type outer material.

[0074] The exterior material (120) may include a first exterior material (120A) having a receiving portion (121) formed therein for receiving an electrode assembly (110), and a second exterior material (120B) covering the receiving portion (121).

[0075] As illustrated in FIG. 3, the first exterior material (120A) and the second exterior material (120B) can be connected by a folding portion (124). In this case, the first exterior material (120A) and the second exterior material (120B) can be sealed by having three sides, excluding the side where the folding portion (124) is formed, come into contact with each other. This case will be described below as an example.

[0076] However, it is not limited to this, and the first exterior material (120A) and the second exterior material (120B) may be manufactured separately from each other. In this case, the first exterior material (120A) and the second exterior material (120B) may be sealed by having four sides in contact with each other.

[0077] In the first exterior material (120A), a receiving portion (121) may be formed by recessing it to a predetermined depth. The second exterior material (120B) may cover this receiving portion (121).

[0078] As illustrated in FIG. 3, a receiving portion (121) may also be formed in the second outer material (120B). In this case, the receiving portion (121) of the second outer material (120B) may cover the receiving portion (121) of the first outer material (120A). That is, both receiving portions (121) may form a single receiving space in which the electrode assembly (110) is received.

[0079] However, it is not limited to this, and the second exterior material (120B) may also be formed flat.

[0080] The exterior material (120) may include terrace sections (122)(123) located around the perimeter of the storage section (121). More specifically, the terrace sections (122)(123) may be parts where the first exterior material (120A) and the second exterior material (120B) are in contact with or adjacent to each other.

[0081] The terrace section (122)(123) may include a first terrace section (122) in which an electrode lead (112) protrudes, and a second terrace section (123) extending in a direction different from the extension direction of the first terrace section (122). The first terrace section (122) may define the short side of the exterior material (120), and the second terrace section (123) may define the long side of the exterior material (120).

[0082] The first terrace section (122) may be located on part of the perimeter of the storage section (121). For example, the first terrace section (122) may be located on both sides in the longitudinal direction of the storage section (121) and may extend approximately in the width direction of the storage section (121). The electrode lead (112) may protrude to the outside of the exterior material (120) through the first terrace section (122).

[0083] Some parts of the first terrace section (122) may be sealed to each other, and other parts may be sealed to the lead film (113). More specifically, in some parts of the first terrace section (123), the first exterior material (120A) and the second exterior material (120B) may be sealed to each other. In other parts of the first terrace section (123), one side of the lead film (113) may be sealed to the first exterior material (120A), and the other side of the lead film (113) may be sealed to the second exterior material (120B).

[0084] That is, the lead film (113) can be sealed to the outer material (120). Thus, the lead assembly (111) can be sealed to the outer material (120).

[0085] The second terrace section (123) may be located on a different part of the perimeter of the storage section (121). For example, the second terrace section (123) may be located on one side in the width direction of the storage section (121) and may extend approximately in the length direction of the storage section (121). The second terrace section (123) may connect both first terrace sections (122). The second terrace section (123) may be located on the opposite side of the folding section (124). The second terrace section (123) may be a part where the electrode lead (112) is not protruding.

[0086] The second terrace section (123) can be sealed together. More specifically, the first exterior material (120A) and the second exterior material (120B) can be sealed together in the second terrace section (123).

[0087] The second terrace section (123) can be folded at least once toward the storage section (121). Preferably, the second terrace section (123) can be SSF (Single side folding) or DSF (Double side folding).

[0088] FIG. 5 is a plan view of the lead assembly illustrated in FIG. 4, and FIG. 6 is an enlarged cross-sectional view of the lead assembly according to one embodiment of the present invention.

[0089] As previously explained, the lead film (113) prevents electricity generated from the electrode assembly (110) from flowing through the electrode lead (112) to the outer material (120) and can maintain the sealing of the outer material (120). To this end, the lead film (113) may be formed from a non-conductive insulating material that does not conduct electricity well. Generally, the lead film (113) is often made of insulating tape that is easy to attach to the electrode lead (112) and has a relatively thin thickness, but is not limited thereto, and any material capable of insulating the electrode lead (112) may be used.

[0090] The lead film (113) may be positioned to wrap around the outer surface of the electrode lead (112). Specifically, a portion of the electrode lead (112) may be surrounded by the lead film (113). The lead film (113) may be located in a limited area of ​​the first terrace portion (122) and may be heat-fused to the inner surface of the first outer material (120A) and the second outer material (120B).

[0091] A lead film (113) can be placed between the electrode lead (112) and the outer material (120). For example, as shown in FIG. 4, the first outer material (120A), lead film (113), electrode lead (112), lead film (113), and second outer material (120B) can be arranged in a stacked state in order in the first terrace portion (122).

[0092] Meanwhile, the lead film (113) may include a metal adhesive layer (1131), a pouch adhesive layer (1132), a core layer (1133), and an anti-adhesion film (1134).

[0093] The metal adhesive layer (1131) may come into contact with the electrode lead (112). More specifically, the metal adhesive layer (1311) may come into direct contact with the electrode lead (112) and may be a layer for bonding the lead film (113) to the electrode lead (112).

[0094] The metal adhesive layer (1131) may include any material that facilitates adhesion with the electrode lead (112). Specifically, the metal adhesive layer (1131) may include a modified polyolefin-based resin, for example, an acid-modified polyolefin. For example, the metal adhesive layer may include at least one of acid-modified polypropylene (PPa), acid-modified polyethylene (PEa), and plasma-treated polypropylene, but is not limited thereto.

[0095] The pouch adhesive layer (1132) may come into contact with the innermost layer of the outer material (120). More specifically, the pouch adhesive layer (1132) may be a layer that comes into direct contact with the sealant layer forming the innermost layer of the outer material (120).

[0096] The pouch adhesive layer (1132) may include an unmodified polyolefin resin. For example, the pouch adhesive layer (1132) may include a polypropylene resin or a polyolefin elastomer (POE). However, it is not limited thereto. Among these, the pouch adhesive layer (1132) may include a polypropylene copolymer such as a polypropylene random copolymer or a polypropylene block copolymer.

[0097] The core layer (1133) may be located between the metal adhesive layer (1131) and the pouch adhesive layer (1132). That is, the core layer (1133) may be a layer located in the center with respect to the thickness direction of the lead film (113).

[0098] The core layer (1133) may include an unmodified polyolefin resin. For example, the core layer (1133) may include polypropylene resin, polyolefin elastomer (POE), and / or additives such as coloring agents. However, it is not limited thereto. Among these, the core layer (1133) may include, for example, a polypropylene homopolymer.

[0099] Meanwhile, the anti-adhesion film (1134) may be located between the metal adhesive layer (1131) and the core layer (1133) and / or between the pouch adhesive layer (1132) and the core layer (1133). In the case of the present embodiment, as shown in FIG. 6, the anti-adhesion film (1134) may be located between the pouch adhesive layer (1132) and the core layer (1133).

[0100] The anti-adhesion film (1134) may include at least one of polytetrafluoroethylene (PTFE) and polyimide (PI) materials. Preferably, the anti-adhesion film (1134) may have a polytetrafluoroethylene (PTFE) material.

[0101] Since the anti-adhesion film (1134) has low adhesive strength, even if the area where the anti-adhesion film (1134) is located in the lead film (113) is sealed, it may not be sealed with the pouch adhesive layer (1132) and / or the core layer (1133). Therefore, the anti-adhesion film (1134) may not be heat-fused with the pouch adhesive layer (1132) and / or the core layer (1133) but simply come into contact with each other, or may be separated to form a predetermined gap (S).

[0102] That is, a certain gap (S) may be formed inside the lead film (113) by the anti-adhesion film (1134). The gap (S) may be formed between the anti-adhesion film (1134) and the pouch adhesive layer (1132) and / or between the anti-adhesion film (1134) and the core layer (1133). For example, as shown in FIG. 6, the gap (S) may be formed between the anti-adhesion film (1134) and the pouch adhesive layer (1132).

[0103] Insulating oil can be trapped in the gap (S) formed inside the lead film (113) by the anti-adhesion film (1134). As previously described, the insulating oil can flow into the battery module (10) (see FIG. 1) to cool the battery cell (100).

[0104] In this regard, there is a concern that insulating oil, particularly hydrocarbon-based insulating oil, may penetrate into the interior of the battery cell (100) through the lead film (113). To resolve this concern, the anti-adhesion film (1134) forms a gap (S) formed inside the lead film (113) and traps the insulating oil in the gap (S), thereby delaying or preventing the penetration of the insulating oil.

[0105] The anti-adhesion film (1134) may be placed on one or both sides of the electrode lead (112). For example, as shown in FIG. 6, the anti-adhesion film (1134) may be placed on one side (e.g., the upper side) of the electrode lead (113).

[0106] Although not illustrated in the drawing, as another example, an anti-adhesion film (1134) may be placed on both sides of the electrode lead (113). That is, a pair of anti-adhesion films (1134) may be provided with the electrode lead (113) in between. In this case, the gap (S) may be formed on both sides of the electrode lead (113), so that the trapping effect of the insulating oil may be increased.

[0107] The insulating oil can primarily penetrate the lead film (113) in the longitudinal direction of the electrode lead (112) (e.g., in a direction parallel to the x-axis). In this regard, referring to FIG. 5, the anti-adhesion film (1134) can be extended in the width direction of the electrode lead (112) (e.g., in a direction parallel to the y-axis). This increases the trapping effect of the insulating oil by the anti-adhesion film (143).

[0108] The length dimension (L) of the anti-adhesion film (1134) may be smaller than the width dimension (W) of the electrode lead (112). Therefore, a gap (S) may not occur in the portion of the lead film (113) located outside the two ends of the anti-adhesion film (1134). Accordingly, since both ends of the gap (S) are blocked, the penetration of insulating oil can be further delayed.

[0109] The lead film (113) may include a first region (113A) that overlaps with the exterior material (120) and a second region (113B) that protrudes outward from the exterior material (120). More specifically, the first region (113A) may overlap with the first sealing portion (122) of the exterior material (120), and the second region (113B) may protrude outward from the first sealing portion (122) of the exterior material (120).

[0110] The penetration of insulating oil into the lead film (113) can primarily occur in the second region (113B). Therefore, to effectively trap the insulating oil, the anti-adhesion film (1134) can be located in the second region (113B). That is, the anti-adhesion film (1134) can be non-overlapping with the outer material, more specifically the first sealing portion (122).

[0111] With respect to the longitudinal direction of the electrode lead (112) (e.g., the direction parallel to the x-axis), the distance (d1) to one edge of the lead film (113) relative to the anti-adhesion film (1134) may be closer than the distance (d2) to the other edge of the lead film (113). Here, the one edge may be an outer edge and the other edge may be an inner edge. Thus, within the limited size of the lead film (113), the anti-adhesion film (1134) may be located within the second region (113B).

[0112] FIG. 7 is an enlarged cross-sectional view of a lead assembly according to another embodiment of the present invention.

[0113] Below, content that overlaps with the previously explained material will be referenced, and the differences will be explained in detail.

[0114] In the case of this embodiment, as shown in FIG. 7, the anti-adhesion film (1134) may be located between the metal adhesive layer (1131) and the core layer (1133).

[0115] A gap (S) formed inside the lead film (113) by the anti-adhesion film (1134) may be formed between the anti-adhesion film (1134) and the metal adhesive layer (1131) and / or between the anti-adhesion film (1134) and the core layer (1133). For example, as shown in FIG. 7, the gap (S) may be formed between the anti-adhesion film (1134) and the core layer (1133).

[0116] Meanwhile, although not shown in the drawing, the anti-adhesion film (1134) may be positioned between the metal adhesive layer (1131) and the core layer (1133), and between the pouch adhesive layer (1132) and the core layer (1133). In this case, a pair of anti-adhesion films (1134) may be provided on one side of the electrode lead (112), or a pair of anti-adhesion films (1134) may be provided on both sides of the electrode lead (112).

[0117] In addition, those skilled in the art will easily understand that various embodiments are possible, such as having a pair of anti-adhesion films (1134) on one side of the electrode lead (112) and a single anti-adhesion film (1134) on the other side.

[0118] The above description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention.

[0119] Accordingly, the embodiments disclosed in this invention are intended to explain, not limit, the technical concept of the invention, and the scope of the technical concept of the invention is not limited by these embodiments.

[0120] The scope of protection of the present invention shall be interpreted by the claims below, and all technical ideas within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

[0121] [Explanation of the symbol]

[0122] 10: Battery module 20: Circulation system

[0123] 21: Pump 22: Cooling section

[0124] 23: Inlet 24: Outlet

[0125] 100; Battery cell 110: Electrode assembly

[0126] 111: Lead assembly 112: Electrode lead

[0127] 113: Lead film 113A: First region

[0128] 113B: Second region 1131: Metal adhesive layer

[0129] 1132: Pouch adhesive layer 1133: Core layer

[0130] 1134: Anti-adhesion film 120: Exterior material

[0131] 120A: 1st exterior material 120B: 2nd exterior material

[0132] 121: Storage area 122: First terrace area

[0133] 123: 2nd Terrace Section 200: Housing

Claims

1. In a lid assembly sealed to a pouch-type outer material, Metal electrode lead; It includes a lead film having an insulating material that surrounds the electrode lead, and The above lead film is, A metal adhesive layer in contact with the electrode lead above; A pouch adhesive layer in contact with the innermost layer of the above-mentioned exterior material; A core layer located between the metal adhesive layer and the pouch adhesive layer; and A lead assembly comprising an anti-adhesion film positioned between the metal adhesive layer and the core layer and / or between the pouch adhesive layer and the core layer.

2. In Paragraph 1, The above anti-adhesion film is a lead assembly having a polytetrafluoroethylene (PTFE) material.

3. In Paragraph 1, The above anti-adhesion film is a lead assembly extending in the width direction of the electrode lead.

4. In Paragraph 3, A lead assembly in which the length dimension of the above anti-adhesion film is smaller than the width dimension of the above electrode lead.

5. In Paragraph 1, A lead assembly in which, with respect to the longitudinal direction of the electrode lead, the distance to one edge of the lead film relative to the anti-adhesion film is closer than the distance to the other edge of the lead film.

6. In Paragraph 1, The above anti-adhesion film is a lead assembly disposed on one or both sides of the electrode lead.

7. Electrode assembly; A pouch-type outer material accommodating the above electrode assembly; An electrode lead connected to the electrode assembly and protruding outside the outer casing, having a metal material; and It includes a lead film that surrounds the electrode lead and insulates the outer material from the electrode lead, and The above lead film is, A metal adhesive layer bonded to the electrode lead; A pouch adhesive layer bonded to the innermost layer of the above-mentioned exterior material; A core layer located between the metal adhesive layer and the pouch adhesive layer; and A battery cell comprising an anti-adhesion film located between the metal adhesive layer and the core layer and / or between the pouch adhesive layer and the core layer.

8. In Paragraph 7, The above lead film is, A first area overlapping with the above exterior material; and It includes a second region that protrudes outwardly from the above exterior material, and The above anti-adhesion film is a battery cell located in the above second region.

9. In Paragraph 7, The above anti-adhesion film is a battery cell extending in the width direction of the electrode lead.

10. In Paragraph 9, A battery cell in which the length dimension of the above anti-adhesion film is smaller than the width dimension of the above electrode lead.

11. In Paragraph 7, A battery cell in which, with respect to the longitudinal direction of the electrode lead, the distance to the outer edge of the lead film relative to the anti-adhesion film is closer than the distance to the inner edge of the lead film.

12. In Paragraph 7, The above anti-adhesion film is a battery cell disposed on one or both sides of the electrode lead.

13. In Paragraph 7, A battery cell in which insulating oil is trapped in the gap formed inside the lead film by the above anti-adhesion film.

14. A battery module in which a plurality of battery cells are accommodated in a housing; and It includes a circulation system that circulates insulating oil into the interior of the above battery module, and The above battery cell is, Electrode assembly; A pouch-type outer material accommodating the above electrode assembly; An electrode lead connected to the electrode assembly and protruding outside the outer casing, having a metal material; and It includes a lead film that surrounds the electrode lead and insulates the outer material from the electrode lead, The above lead film is, A metal adhesive layer bonded to the electrode lead; A pouch adhesive layer bonded to the innermost layer of the above-mentioned exterior material; A core layer located between the metal adhesive layer and the pouch adhesive layer; and A battery module system comprising an anti-adhesion film positioned between the metal adhesive layer and the core layer and / or between the pouch adhesive layer and the core layer.

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