Battery cell, battery module system, and battery cell production method

Abstract

A battery cell according to an embodiment of the present invention may comprise an electrode assembly and a pouch-type exterior material having an accommodation part for accommodating the electrode assembly, and a terrace part positioned around the accommodation part. The terrace part may comprise: a first sealing portion configured to isolate the inside and outside of the accommodation part; a second sealing portion formed at a predetermined distance from the first sealing portion in a direction away from the accommodation portion; and an unsealed portion positioned between the first sealing portion and the second sealing portion and configured to trap insulating oil infiltrating from the outside.

Description

Battery cell, battery module system and battery cell manufacturing method

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0190860 filed 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 pouch-type battery cell, a battery module system comprising a plurality of said battery cells, and a method for manufacturing said 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 sealing part. Therefore, a method to delay the penetration time of the insulating oil is required.

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

[0011] Another problem that the present invention aims to solve is to provide a method for manufacturing the battery cell.

[0012] A battery cell according to an embodiment of the present invention may include an electrode assembly; and a pouch-type outer material having a storage portion that accommodates the electrode assembly and a terrace portion located around the perimeter of the storage portion. The terrace portion may include a first sealing portion that blocks the interior and exterior of the storage portion; a second sealing portion formed at a predetermined distance from the first sealing portion in a direction away from the storage portion; and an unsealed portion located between the first sealing portion and the second sealing portion and configured to trap insulating oil penetrating from the outside.

[0013] Both ends of the above-mentioned sealing part can be closed.

[0014] Insulating oil can be trapped inside the above-mentioned unsealed portion.

[0015] The above insulating oil can be trapped between the two resin layers forming the innermost layer of the above unsealed portion.

[0016] The battery cell may further include an electrode lead connected to the electrode assembly and protruding outside the outer casing; and a lead film surrounding the electrode lead and insulating the outer casing from the electrode lead. The unsealed portion may extend along the side of the outer casing where the electrode lead does not protrude.

[0017] 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; and a pouch-type outer material having a storage portion that accommodates the electrode assembly and a terrace portion located around the perimeter of the storage portion. The terrace portion may include a first sealing portion that blocks the interior and exterior of the storage portion; a second sealing portion formed at a predetermined distance from the first sealing portion in a direction away from the storage portion; and an unsealing portion located between the first sealing portion and the second sealing portion and configured to trap the insulating oil inside.

[0018] The above insulating oil can be trapped between the two resin layers forming the innermost layer of the above unsealed portion.

[0019] The battery cell may further include an electrode lead connected to the electrode assembly and protruding outward from the short side of the outer casing; and a lead film surrounding the electrode lead and insulating the outer casing from the electrode lead. The unsealed portion may extend along the long side of the outer casing.

[0020] The above circulation system may include an inlet connected to one side in the longitudinal direction of the battery module; and an outlet connected to the other side in the longitudinal direction of the battery module.

[0021] A method for manufacturing a battery cell according to an embodiment of the present invention may include the step of accommodating an electrode assembly in a storage portion of a pouch-type outer material; and the step of sealing the outer material. The step of sealing the outer material may include the step of forming a first sealing portion that blocks the inside and outside of the storage portion; and the step of forming a second sealing portion at a predetermined distance from the first sealing portion in a direction away from the storage portion, wherein an unsealed portion may be formed between the first sealing portion and the second sealing portion, configured to trap insulating oil penetrating from the outside.

[0022] The sealing tool for sealing the exterior material can form the second sealing part by moving away from the storage part after forming the first sealing part.

[0023] A sealing tool for sealing the exterior material may include: a main body; a first tool tip protruding from the main body and forming the first sealing portion; and a second tool tip protruding from the main body and forming the second sealing portion at a predetermined distance from the first tool tip. The first sealing portion and the second sealing portion may be formed simultaneously.

[0024] According to a preferred embodiment of the present invention, the unsealed portion can trap insulating oil inside. This allows for delaying or preventing insulating oil for cooling the battery cell from penetrating into the interior of the battery cell.

[0025] 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.

[0026] 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.

[0027] FIG. 1 is a schematic diagram of a battery module system according to one embodiment of the present invention.

[0028] Figure 2 is an exploded perspective view of the battery module shown in Figure 1.

[0029] FIG. 3 is an exploded perspective view of a battery cell according to one embodiment of the present invention.

[0030] FIG. 4 is a front view of a battery cell according to one embodiment of the present invention.

[0031] Figure 5 is a cross-sectional view along A-A' of Figure 4.

[0032] FIG. 6 is a flowchart of a method for manufacturing a battery cell according to one embodiment of the present invention.

[0033] Figure 7 is a diagram illustrating an example of step S20 of Figure 6.

[0034] Figure 8 is a diagram illustrating another example of step S20 of Figure 6.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] A battery module system according to one embodiment of the present invention may include a battery module (10) and a circulation system (20).

[0041] 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.

[0042] The housing (200) can form the exterior of the battery module (10). The housing (200) can have a metal material with high strength.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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).

[0047] 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.

[0048] The battery module (10) may include a busbar frame (300) and an end cover (400).

[0049] 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.

[0050] 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).

[0051] 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).

[0052] 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).

[0053] 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).

[0054] 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.

[0055] 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).

[0056] 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).

[0057] 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.

[0058] 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).

[0059] 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).

[0060] 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.

[0061] FIG. 3 is an exploded perspective view of a battery cell according to one embodiment of the present invention.

[0062] The battery cell (100) may include an electrode assembly (110) and an outer casing (120).

[0063] 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.

[0064] 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.

[0065] The electrode assembly (110) may include electrode tabs (111) connected to a positive electrode and a negative electrode, respectively, and the electrode tabs (111) may serve as a path through which electrons can move between the inside and outside of the electrode assembly (110). The electrode tabs (111) 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.

[0066] The battery cell (100) may further include an electrode lead (112) connected to an electrode assembly (110) and a lead film (113) surrounding the electrode lead (112).

[0067] The electrode lead (112) can electrically connect the electrode assembly (110) to an external load. More specifically, the electrode lead (111) can be connected to the electrode tab (111) of the electrode assembly (110).

[0068] One end of the electrode lead (112) is connected to the electrode tab (111), 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.

[0069] The lead film (113) can surround a portion of the electrode lead (111). The lead film (113) may have an insulating material. Generally, the lead film (113) is often made of insulating tape that is easy to attach to the electrode lead (112) and is relatively thin, but it is not limited to this.

[0070] 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).

[0071] 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.

[0072] The above laminate sheet may include a first resin layer (131), a second resin layer (132), and a metal layer (133). That is, an exterior material (120) manufactured by molding the above laminate sheet may include a first resin layer (131), a second resin layer (132), and a metal layer (133).

[0073] The first resin layer (131) can form the innermost layer of the outer material (120). That is, the first resin layer (131) can come into contact with the electrode assembly (110) and the electrolyte. Additionally, the first resin layer (131) can be heat-fused to form a sealing portion (141)(142) (see FIG. 4) to be described later. Therefore, it is desirable for the first resin layer (131) to have a material with excellent insulation and bonding properties. For example, the first resin layer (131) may include a polypropylene (PP) material.

[0074] The second resin layer (132) can form the outermost layer of the exterior material (120). That is, the second resin layer (132) can come into contact with other battery cells or components. Therefore, it is desirable for the second resin layer (132) to have a material having high wear resistance, insulation, and strength. For example, the second resin layer (132) may include a polyethylene-terephthalate (PET) material.

[0075] The metal layer (133) may be located between the first resin layer (131) and the second resin layer (132). It is preferable that the metal layer (133) be made of a material that has suitable moldability and strength and can prevent moisture from penetrating from the outside. For example, the metal layer (133) may be made of aluminum.

[0076] The above laminate sheet may further include an auxiliary resin layer (134). That is, the exterior material (120) manufactured by molding the above laminate sheet may further include an auxiliary resin layer (134).

[0077] The auxiliary resin layer (134) may be located between the metal layer (133) and the second resin layer (132). The auxiliary resin layer (134) may have an appropriate elongation rate so as to mitigate the difference between the elongation rate of the metal layer (133) and the elongation rate of the second resin layer (132) in the middle. For example, the auxiliary resin layer (134) may be made of nylon material.

[0078] Meanwhile, the exterior material (120) may include a first exterior material (120A) having a receiving portion (121) formed therein for receiving the electrode assembly (110), and a second exterior material (120B) covering the receiving portion (121).

[0079] 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.

[0080] 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.

[0081] 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).

[0082] 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.

[0083] However, it is not limited to this, and the second exterior material (120B) may also be formed flat.

[0084] 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.

[0085] 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).

[0086] 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).

[0087] 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.

[0088] 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).

[0089] FIG. 4 is a front view of a battery cell according to one embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along A-A' of FIG. 4.

[0090] The terrace section (122)(123) may include a first sealing section (141), a second sealing section (142), and an unsealed section (143).

[0091] The first sealing portion (141) and the second sealing portion (142) may be a portion where the first exterior material (120A) and the second exterior material (120B) are joined to each other. For example, such joining may be achieved by thermal fusion. More specifically, the first sealing portion (141) and the second sealing portion (142) may be formed by thermally fusing the first resin layer (131) of the first exterior material (120A) and the first resin layer (131) of the second exterior material (120B).

[0092] The first sealing portion (141) can block the inside and outside of the storage portion (121). A portion of the first sealing portion (141) may be formed in the first terrace portion (122), and another portion may be formed in the second terrace portion (123).

[0093] As illustrated in FIG. 4, when the first exterior material (120A) and the second exterior material (120B) are connected by a folding portion (124), the first sealing portion (141) may be formed along three sides of the exterior material (120). On the other hand, when the first exterior material (120A) and the second exterior material (120B) are separate members, the first sealing portion (141) may be formed along four sides of the exterior material (120).

[0094] The second sealing portion (142) may be formed at a predetermined distance (g) from the first sealing portion (141) in a direction away from the storage portion (121). The second sealing portion (142) may be formed on the second terrace portion (123). The second sealing portion (142) may be formed along the second terrace portion (123).

[0095] The unsealed portion (143) may be located between the first sealing portion (141) and the second sealing portion (142). In the unsealed portion (143), the first resin layer (131) of the first exterior material (120A) and the first resin layer (131) of the second exterior material (120B) may simply come into contact without being heat-fused to each other, or may be separated to form a predetermined gap (S).

[0096] Insulating oil that flows into the battery module (10) (see FIG. 1) and cools the battery cell (100) can be trapped within the unsealed portion (143). More specifically, the insulating oil can be trapped between the two resin layers (131) forming the innermost layer of the unsealed portion (143). Even more specifically, the insulating oil can be trapped in a predetermined gap (S) formed between the first resin layer (131) of the first outer material (120A) and the first resin layer (131) of the second outer material (120B) in the unsealed portion (143).

[0097] In this regard, insulating oil, particularly hydrocarbon-based insulating oil, cannot penetrate the metal layer (133) of the pouch (120), but there is a concern that it may penetrate into the interior of the battery cell (100) through the first resin layer (131). To resolve this concern, the unsealed portion (143) can delay or prevent the penetration of insulating oil by trapping the insulating oil inside.

[0098] Both ends of the unsealed portion (143) can be closed. That is, both ends of the unsealed portion (143) can be sealed. Accordingly, the penetration of insulating oil can be further delayed.

[0099] The unsealed portion (143) can be extended parallel to the length direction of the second terrace portion (123). That is, the unsealed portion (143) can be extended along the side (i.e., the long side) where the electrode lead (112) does not protrude from the outer material (120). By doing so, the length of the unsealed portion (143) can be increased and the trapping effect of the insulating oil can be increased.

[0100] As illustrated in FIG. 4, when the first exterior material (120A) and the second exterior material (120B) are connected to the folding portion (124), the second sealing portion (142) and the unsealed portion (143) may be formed along one long side located on one side of the storage portion (121). On the other hand, when the first exterior material (120A) and the second exterior material (120B) are separate members, the second sealing portion (142) and the unsealed portion (143) may be formed along both long sides located on both sides of the storage portion (121).

[0101] FIG. 6 is a flowchart of a method for manufacturing a battery cell according to one embodiment of the present invention, FIG. 7 is a diagram for explaining one example of step S20 of FIG. 6, and FIG. 8 is a diagram for explaining another example of step S20 of FIG. 6.

[0102] Hereinafter, a method for manufacturing the battery cell (100) described above is described as another embodiment of the present invention.

[0103] The battery cell manufacturing method according to the present embodiment may include a step (S10) (hereinafter, 'acceptance step') of receiving an electrode assembly (110) in a storage portion (121) of a pouch-type outer material (120), and a step (S20) (hereinafter, 'sealing step') of sealing the outer material (120) with a sealing tool (500).

[0104] During the receiving step (S10), the electrode assembly (110) can be received in the receiving portion (121) of the first outer material (120A), and the second outer material (120B) can cover the electrode assembly (110). That is, the electrode assembly (110) can be received between the first outer material (120A) and the second outer material (120B).

[0105] During the sealing step (S20), the sealing tool (500) can seal the exterior material (120). A pair of sealing tools (500) may be provided facing each other with the exterior material (120) in between.

[0106] The sealing step (S20) may include a step (S21) of forming a first sealing portion (141) and a step (S22) of forming a second sealing portion (142). As previously described, the first sealing portion (141) can block the inside and outside of the storage portion (121). The second sealing portion (142) can be spaced apart (g) from the first sealing portion (141) in a direction away from the storage portion (121).

[0107] For example, referring to FIG. 7, the sealing tool (500) can form a second sealing part (142) by moving away from the storage part (121) after forming a first sealing part (141). That is, the first sealing part (141) and the second sealing part (142) can be formed with a time difference.

[0108] In this example, the sealing tool (500) itself has a simple configuration, and there is an advantage in that the existing sealing tool (500) can be used as is.

[0109] As another example, referring to FIG. 8, the sealing tool (500') may include a main body (510), a first tool tip (520) protruding from the main body (510) and forming a first sealing portion (141), and a second tool tip (530) protruding from the main body (510) and forming a second sealing portion (142) at a predetermined distance from the first tool tip (510). That is, the first sealing portion (141) and the second sealing portion (142) may be formed simultaneously.

[0110] In the case of the present example, there is an advantage in that the time consumed to form the first sealing part (141) and the second sealing part (142) is reduced, and it is easy to form a constant gap (g) between the first sealing part (141) and the second sealing part (142).

[0111] 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.

[0112] 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.

[0113] 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.

[0114] [Explanation of the symbol]

[0115] 10: Battery module 20: Circulation system

[0116] 21: Pump 22: Cooling section

[0117] 23: Inlet 24: Outlet

[0118] 100; Battery cell 110: Electrode assembly

[0119] 111: Electrode tab 112: Electrode lead

[0120] 113: Lid film 120: Exterior material

[0121] 120A: 1st exterior material 120B: 2nd exterior material

[0122] 121: Storage area 122: First terrace area

[0123] 123: Second Terrace Section 131: First Resin Layer

[0124] 132: Second resin layer 133: Metal layer

[0125] 134: Auxiliary resin layer 141: First sealing part

[0126] 142: Second sealing section 143: Unsealed section

[0127] 200: Housing

Claims

1. Electrode assembly; and A pouch-type outer material comprising a storage portion for accommodating the electrode assembly and a terrace portion located around the perimeter of the storage portion, and The above terrace section is, A first sealing part that blocks the inside and outside of the storage part; A second sealing portion formed at a predetermined distance from the first sealing portion in a direction away from the storage portion; and A battery cell comprising an unsealed portion located between the first sealing portion and the second sealing portion and configured to trap insulating oil penetrating from the outside.

2. In Paragraph 1, The two ends of the above-mentioned unsealed portion are closed battery cells.

3. In Paragraph 1, A battery cell in which insulating oil is trapped inside the above-mentioned sealing portion.

4. In Paragraph 3, The above insulating oil is a battery cell that is trapped between two resin layers forming the innermost layer of the above-mentioned sealing portion.

5. In Paragraph 1, An electrode lead connected to the electrode assembly and protruding to the outside of the outer casing; and It further includes a lead film that surrounds the electrode lead and insulates the outer material from the electrode lead. The above-mentioned non-sealing portion is a battery cell that extends along the side of the outer material where the electrode lead does not protrude.

6. 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; and A pouch-type outer material comprising a storage portion for accommodating the electrode assembly and a terrace portion located around the perimeter of the storage portion, The above terrace section is, A first sealing part that blocks the inside and outside of the storage part; A second sealing portion formed at a predetermined distance from the first sealing portion in a direction away from the storage portion; and A battery module system comprising a non-sealing portion located between the first sealing portion and the second sealing portion and configured to trap the insulating oil inside.

7. In Paragraph 6, The above insulating oil is trapped between two resin layers forming the innermost layer of the above-mentioned unsealed portion in a battery module system.

8. In Paragraph 6, The above battery cell is, An electrode lead connected to the electrode assembly and protruding outward from the short side of the outer casing; and It further includes a lead film that surrounds the electrode lead and insulates the outer material from the electrode lead. The above-mentioned unsealed portion is a battery module system extending along the long side of the exterior material.

9. In Paragraph 8, The above circulation system is, An inlet connected to one side in the longitudinal direction of the above battery module; and A battery module system including an outlet connected to the other side in the longitudinal direction of the battery module.

10. A step of accommodating an electrode assembly in a storage portion of a pouch-type outer material; and The above includes the step of sealing the exterior material, The step of sealing the above exterior material is, A step of forming a first sealing portion that blocks the interior and exterior of the storage portion; and The method includes the step of forming a second sealing portion at a predetermined distance from the first sealing portion in a direction away from the storage portion, and A method for manufacturing a battery cell in which an unsealed portion is formed between the first sealing portion and the second sealing portion, configured to trap insulating oil penetrating from the outside.

11. In Paragraph 10, A method for manufacturing a battery cell in which a sealing tool for sealing the above-mentioned exterior material moves in a direction away from the storage portion after forming the first sealing portion to form the second sealing portion.

12. In Paragraph 10, The sealing tool for sealing the above exterior material is, entity; A first tool tip protruding from the main body and forming the first sealing portion; and It includes a second tool tip that protrudes from the main body and forms a second sealing portion with a predetermined distance from the first tool tip. A method for manufacturing a battery cell in which the first sealing part and the second sealing part are formed simultaneously.

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