Battery pack, vehicle including the same and energy storage system including the same

Abstract

The battery pack of the present invention may include a plurality of battery cells, a pack housing for accommodating the plurality of battery cells, a filling member configured to fill at least a portion of the internal space of the pack housing, a conductive member configured to electrically connect the plurality of battery cells, and a busbar assembly configured to cover the conductive member or partition the filling member.

Description

Technology Field

[0001] The present invention relates to a battery pack, an automobile including the same, and an energy storage system including the same. Background Technology

[0003] Secondary batteries, which possess electrical characteristics such as high energy density and high applicability across product categories, are widely applied not only to portable devices but also to electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric sources.

[0004] These secondary batteries are attracting attention as a new energy source for improving eco-friendliness and energy efficiency, not only for the primary advantage of being able to drastically reduce the use of fossil fuels, but also because they do not generate any by-products from the use of energy.

[0005] Currently, widely used types of secondary batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. When a high output voltage is required, multiple battery cells are connected in series to form a battery module or battery pack. Additionally, to increase charge / discharge capacity, multiple battery cells are connected in parallel to form a battery module or battery pack. Therefore, the number of battery cells included in the above battery module or pack can be set in various ways depending on the required output voltage or charge / discharge capacity.

[0006] Meanwhile, since battery cells involve chemical reactions during charging and discharging, their performance may degrade if used in environments higher than the optimal temperature; furthermore, if thermal control is not maintained at the appropriate temperature, there is a constant risk of unexpected ignition or explosion. Additionally, battery packs are structured to house these battery cells intensively within a module frame. Consequently, if a thermal event occurs in a single battery cell, the emitted high-temperature gases and flames can spread to adjacent cells, potentially leading to a chain reaction of explosions, making this extremely dangerous.

[0007] Accordingly, thermal runaway can be prevented by adding a cover member to the top of the battery cell that is not deformed by high temperature and high pressure. However, if the cover member is not fully opened when a thermal event occurs in the battery cell, the venting of high-temperature gases, etc., may be suppressed. In this case, high-temperature gases or flames may accumulate inside the cover member and transfer to adjacent battery cells, accumulating on the top and sides of the adjacent battery cells, which can lead to a chain reaction of battery cell explosions.

[0008] In particular, when resin is used to fill the spaces between battery cells, if a thermal event occurs in a single battery cell, the resin may be damaged or lifted over an area larger than that of a single battery cell if high-temperature venting gas vents in a specific direction (e.g., upward). Consequently, high-temperature venting gas or electrode fragments may transfer to adjacent battery cells, potentially leading to thermal runaway.

[0009] Therefore, there is a need to develop a battery pack capable of compartmentalizing and separating the resin to suppress heat transfer between the battery cell where the event occurred and other battery cells, and to delay heat transfer, in the event of thermal runaway in a battery module. The problem to be solved

[0011] Accordingly, the problem that the present invention aims to solve is to provide a battery pack capable of preventing or suppressing thermal runaway propagation between battery cells by partitioning and separating the battery cells and the resin so that adjacent battery cells are not affected by the resin when a thermal event occurs in the battery cells.

[0012] In addition, another problem that the present invention aims to solve is to provide a vehicle including such battery cells.

[0013] However, the problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by those skilled in the art from the description of the invention below. means of solving the problem

[0015] To solve the above problem, the battery pack of the present invention may include a plurality of battery cells, a pack housing that accommodates the plurality of battery cells, a filling member configured to fill at least a portion of the internal space of the pack housing, a conductive member configured to electrically connect the plurality of battery cells, and a busbar assembly configured to cover the conductive member or partition the filling member.

[0016] When a thermal event occurs in the battery cell, the filling member facing the battery cell where the event occurred may be configured to break into a shape corresponding to the insulating cover portion.

[0017] The above insulating cover portion may be a closed-loop shape disposed between adjacent battery cells.

[0018] The above insulating cover may have a symmetrical structure with respect to the winding axis of the battery cell.

[0019] The above insulating cover may be a pattern in which a plurality of hexagonal grids are connected in succession.

[0020] The insulating cover portion may have a first region covering the conductive portion and a second region extending from the first region and connecting a plurality of first regions.

[0021] The first region of the insulating cover portion may comprise an upper cover covering the upper side of the conductive portion and a lower cover covering the lower side of the conductive portion.

[0022] The vertical thickness of the upper cover may be greater than the vertical thickness of the conductive part.

[0023] The vertical thickness of the above busbar assembly may be 1.5 mm or more and 3 mm or less.

[0024] The vertical thickness of the busbar assembly including the first region of the insulating cover portion and the vertical thickness of the second region of the insulating cover portion may be the same.

[0025] The second region may be in the form of the upper cover of the first region extended in a horizontal direction.

[0026] The above insulating cover may further have a protrusion to protect the side of the conductive part.

[0027] The above insulating cover may include a fire-resistant material.

[0028] The above insulating cover may include PEEK.

[0029] The height of the upper surface of the insulating cover portion may be higher than the height of the upper surface of the filling member.

[0030] The height of the upper surface of the insulating cover portion may be higher than the height of the upper surface of the filling member.

[0031] The above pack housing has a pack lid covering the upper side of the battery cell, and the insulating cover portion may be positioned spaced apart from the pack lid.

[0032] And, the present invention provides an automobile characterized by including a battery pack according to the present invention.

[0033] And, the present invention provides an energy storage system characterized by including a battery pack according to the present invention. Effects of the invention

[0035] According to one aspect of the present invention, the resin can be structurally compartmentalized and separated. This prevents high-temperature gases or flames generated in the battery cell from crossing the frame and directly affecting other battery cells.

[0036] Accordingly, according to the above aspect of the present invention, even if a thermal event occurs in any battery cell, thermal damage to other battery cells can be suppressed, so that heat transfer on a battery cell-by-battery basis within the battery pack can be delayed or prevented. As a result, the safety and reliability of the battery pack can be guaranteed.

[0037] In addition, according to another aspect of the present invention, events resulting from thermal runaway phenomena in battery packs or devices equipped with them, such as fire or explosion, can be prevented or delayed.

[0038] In addition to the above, the present invention may have various other effects, which are described in each embodiment, or effects that can be easily inferred by those skilled in the art, etc., will be omitted. Brief explanation of the drawing

[0040] 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. FIG. 1 is an internal perspective view of a battery pack according to one embodiment of the present invention. FIG. 2 is an exploded perspective view of a battery pack according to one embodiment of the present invention. FIG. 3 is a plan view showing a battery cell and a busbar assembly according to one embodiment of the present invention. FIG. 4 is a perspective view showing a battery cell and a busbar assembly according to one embodiment of the present invention. FIG. 5 is a cross-sectional view of FIG. 4 taken along line C-C' according to one embodiment of the present invention. FIG. 6 is a cross-sectional view of FIG. 4 taken along line D-D' according to one embodiment of the present invention. Figure 7 is a cross-sectional view showing the occurrence of a thermal event in the battery cell of Figure 6. FIG. 8 is a perspective view showing a busbar assembly according to one embodiment of the present invention. FIG. 9 is a cross-sectional view taken along A-A' of the busbar assembly of FIG. 8 according to one embodiment of the present invention. FIG. 10 is a cross-sectional view taken along B-B' of the busbar assembly of FIG. 8 according to one embodiment of the present invention. FIG. 11 is a cross-sectional view showing the busbar assembly of FIG. 9 and FIG. 10 side by side according to one embodiment of the present invention. FIG. 12 is a cross-sectional view showing the busbar assembly of FIG. 9 and FIG. 10 side by side according to another embodiment of the present invention. FIG. 13 is a cross-sectional view of FIG. 4 taken along line D-D' according to another embodiment of the present invention. FIG. 14 is an overall perspective view of a battery cell included in a battery pack according to one embodiment of the present invention. FIG. 15 is a cross-sectional perspective view of a battery cell included in a battery pack according to one embodiment of the present invention. FIG. 16 is a schematic perspective view of a vehicle including a battery pack according to one embodiment of the present invention. FIG. 17 is a drawing showing a container according to one embodiment of the present invention. Specific details for implementing the invention

[0041] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, 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 present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0042] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0043] In addition, the present invention includes various embodiments. For each embodiment, redundant descriptions of substantially identical or similar configurations are omitted, and the focus is on the differences.

[0044] Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in different embodiments.

[0045] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

[0046] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0047] In addition, where it is stated that one component is "connected," "combined," or "connected" to another component, it should be understood that while the components may be directly connected or connected to each other, another component may be "interposed" between each component, or each component may be "connected," "combined," or "connected" through another component.

[0048] Singular expressions used in this specification include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "composed of" or "comprising" should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as meaning that some of the components or steps may be omitted or additional components or steps may be included.

[0049] Throughout the specification, when "A and / or B" is used, it may mean A, B, or A and B unless specifically stated otherwise.

[0050] Meanwhile, although terms indicating directions such as up, down, left, right, front, and back may be used in the present invention, these terms are used merely for convenience of explanation and may vary depending on the position of the object or the position of the observer, as is obvious to those skilled in the art of the present invention.

[0051] For example, in an embodiment of the present invention, the X-axis direction shown in the drawing may mean the left-right direction, the Y-axis direction may mean the front-back direction perpendicular to the X-axis direction on the horizontal plane (XY plane), and the Z-axis direction may mean the up-down direction (vertical direction) perpendicular to both the X-axis direction and the Y-axis direction.

[0052] In addition, for convenience of explanation, the direction following the length direction of the winding axis of the electrode assembly (10) wound in a jelly roll shape in this specification is referred to as the axial direction. The direction surrounding the winding axis is referred to as the circumferential direction or the periphery direction. The direction approaching the winding axis or moving away from the winding axis is referred to as the radial direction. In particular, the direction approaching the winding axis is referred to as the centripetal direction, and the direction moving away from the winding axis is referred to as the centrifugal direction.

[0054] FIG. 1 is an internal perspective view of a battery pack according to one embodiment of the present invention. FIG. 2 is an exploded perspective view of a battery pack according to one embodiment of the present invention.

[0055] Referring to FIGS. 1 to 3, a battery pack (1) according to one embodiment of the present invention may include a battery cell (100), a pack housing (200), a filling member (300), and a busbar assembly (400).

[0056] A plurality of battery cells (100) may be included. And, these plurality of battery cells (100) may include an electrode assembly, a cell case that accommodates the electrode assembly, and an electrode lead that is connected to the electrode assembly and extends outward from the cell case to function as an electrode terminal. At this time, the plurality of battery cells (100) may be electrically connected to each other.

[0057] The battery cell (100) may be a pouch-type secondary battery. The cell case of such a pouch-type secondary battery may be configured in the form of a pouch in which a metal layer made of aluminum is interposed between polymer layers.

[0058] Multiple battery cells (100) can be arranged side by side in the left-right direction (X-axis direction) and / or the front-back direction (Y-axis direction) while standing upright in the vertical direction (Z-axis direction). For example, multiple battery cells (100) can be arranged in a roughly matrix shape.

[0059] Meanwhile, the present invention is not limited by the specific type or form of such battery cell (100), and various battery cells (100) known at the time of filing the present invention may be employed to constitute the battery pack (1) of the present invention. Hereinafter, in this embodiment, the description is limited to the plurality of battery cells (100) being cylindrical secondary batteries.

[0061] The pack housing (200) may be configured to accommodate a plurality of battery cells (100). In order to safely protect the battery cells (100) housed inside, the pack housing (200) may be made of a material capable of ensuring mechanical strength, such as steel or SUS metal or plastic, or may include such a material.

[0062] The pack housing (200) may be provided with a main body (210) and a pack lid (220). The main body (210) may have a space formed to accommodate a battery cell (100). The main body (210) may be configured so that its upper surface is open. The main body (210) may be configured to accommodate a plurality of battery cells (100). The main body (210) may be configured to surround the sides of a plurality of battery cells (100). A plurality of battery cells (100) may be accommodated in a stacked or arranged state within the main body (210), and a filling member (300) may be filled between and on top of the battery cells (100).

[0063] The pack lid (220) can be configured to cover the open upper surface of the main body (210).

[0064] However, according to one embodiment, the pack housing (200) may be omitted. Specifically, the battery pack (1) may be provided in a so-called cell-to-pack structure without including a separate pack housing, thereby increasing space efficiency and improving energy density.

[0066] The filling member (300) may be configured to fill at least a portion of the internal space of the pack housing (200). The filling member (300) may be located inside the pack housing (200) and may be filled around a plurality of battery cells (100). The filling member (300) may cover between the plurality of battery cells (100) and the top of the battery cells (100). The filling member (300) may be filled in the space formed between the plurality of battery cells (100). The filling member (300) may be filled in the space formed between the battery cells (100) and the pack housing (200). The battery pack (1) may be formed into a single unit by filling the filling member (300) between the plurality of battery cells (100). The filling member (300) may be applied to cover at least a portion of the busbar assembly (400).

[0067] Meanwhile, in FIG. 2, the filling member (300) is shown in a cuboid shape for ease of understanding, and the filling member (300) can be filled in the space between multiple battery cells (100) within the pack housing (200).

[0068] Here, the filling member (300) may be prepared as a potting resin by mixing it with beads such as glass bubbles. The potting resin may be formed by injecting a resin material in a liquid state into the plurality of battery cells (100) and allowing it to harden. Specifically, the filling member (300) may be provided as silicone resin. However, it is not limited thereto, and it is of course possible that the filling member (300) may be provided as other resin materials in addition to the silicone resin that can improve the fixation and heat dissipation efficiency of the battery cells (100).

[0069] The filling member (300) can more stably fix the plurality of battery cells (100) and increase the heat dissipation efficiency of the plurality of battery cells (100), thereby further increasing the cooling performance of the battery cells (100).

[0070] In addition, the filling member (300) prevents the penetration of moisture or foreign substances into the battery cell (100), prevents chain ignition when a thermal event occurs due to an abnormality in the battery cell (100), and can increase the structural rigidity of the battery pack (1).

[0071] Additionally, the filling member (300) can perform an insulating role to prevent current flow to adjacent battery cells (100) when damage or other abnormal conditions occur in at least one specific battery cell (100) among the plurality of battery cells (100).

[0072] The filling material (300) can be applied to cover up to the busbar assembly (400). Accordingly, the insulation of the busbar assembly (400) is maintained, and an electrical short circuit between the busbar assemblies (400) can be suppressed in the event of thermal runaway of the battery cell (100).

[0074] The busbar assembly (400) is housed within the pack housing (200) and can be configured to electrically connect a plurality of battery cells (100). The busbar assembly (400) can be provided on one side of the plurality of battery cells (100). Specifically, the busbar assembly (400) can be provided on the upper side (+Z-axis direction) of the plurality of battery cells (100). The busbar assembly (400) can be electrically connected through external charging / discharging lines, connector terminals, etc.

[0076] FIG. 3 is a plan view showing a battery cell and busbar assembly according to an embodiment of the present invention. FIG. 4 is a perspective view showing a battery cell and busbar assembly according to an embodiment of the present invention. FIG. 5 is a cross-sectional view of FIG. 4 taken along line C-C' according to an embodiment of the present invention. FIG. 6 is a cross-sectional view of FIG. 4 taken along line D-D' according to an embodiment of the present invention. FIG. 7 is a cross-sectional view showing a thermal event occurring in the battery cell of FIG. 6.

[0077] The busbar assembly (400) may be equipped with a conductive part (410) and an insulating cover part (420).

[0078] The conductive portion (410) may be configured to electrically connect the plurality of battery cells (100). The conductive portion (410) is a part that is electrically connected to each battery cell (100) and may be directly or indirectly connected to the electrode terminal of the battery cell (100) to form an electrical connection path between the battery cells (100).

[0079] The conductive portion (410) may be configured to enable at least one of serial connection and parallel connection with a plurality of adjacent battery cells (100) in the horizontal direction. Specifically, the conductive portion (410) may electrically connect a first electrode terminal (e.g., 30 in FIG. 14) having a first polarity and a second electrode terminal (e.g., 20a in FIG. 14) having a second polarity of a plurality of battery cells (100). Here, the first polarity may be a positive electrode and the second polarity may be a negative electrode.

[0080] The conductive part (410) may be provided with a conductive material. For example, the conductive part (410) may be provided with a metal material, such as aluminum or copper. It is not limited thereto, and it is of course possible for the conductive part (410) to be provided with other materials for the electrical connection.

[0081] A plurality of conductive portions (410) may be provided. A plurality of conductive portions (410) may be spaced apart from each other by a predetermined distance. A conductive portion (410) may be provided in a strip shape having a predetermined length and width. Here, the strip shape may be formed to correspond to the arrangement structure of a plurality of battery cells (100). For example, the strip shape may be provided in a hexagonal grid structure, a cross structure, a diagonal structure, or a zigzag shape, depending on the arrangement structure of the plurality of battery cells (100). For example, the strip shape may be provided in a hexagonal grid structure shape depending on the arrangement structure of the plurality of battery cells (100).

[0082] The conductive part (410) may be equipped with a first electrode connection part (411) and a second electrode connection part (412).

[0083] The first electrode connection portion (411) is configured to be in contact with the first electrode terminal (30) of the battery cell (100) and can be electrically connected to the first electrode of the electrode assembly (10) through the first electrode terminal (30). The first electrode connection portion (411) can generally be formed of a metal material with excellent conductivity.

[0084] The second electrode connection portion (412) is configured to be in contact with the battery housing (20) and can be electrically connected to the second electrode of the electrode assembly (10). The second electrode connection portion (412) can generally be formed of a metal material with excellent conductivity.

[0085] The first electrode connection part (411) and the second electrode connection part (412) may be provided as an integrated or separate type. Additionally, the first electrode connection part (411) and the second electrode connection part (412) may be formed as a single layer or a multi-layer structure. The method of forming the first electrode connection part (411) and the second electrode connection part (412) may be selectively applied according to the electrical requirements, thermal management characteristics, assembly method, etc. of the battery pack (1), thereby improving the electrical connection reliability and safety of the entire battery cell (100).

[0087] The insulating cover portion (420) can cover the conductive portion (410).

[0088] The insulating cover portion (420) is configured to protect a relatively mechanically and electrically vulnerable part among the electrode terminals of the battery cell (100), and may be arranged to surround, for example, a rivet portion formed on each battery cell (100) or an adjacent area thereof. By such an insulating cover portion (420), direct contact between the vulnerable part of the battery cell (100) and an external member or an adjacent conductive portion (410) is effectively suppressed, thereby reducing the risk of a short circuit that may occur due to thermal runaway, etc.

[0089] The insulating cover portion (420) may be configured to surround the conductive portion (410). The insulating cover portion (420) may be configured to directly cover the outer surface of the conductive portion (410). The electrical insulation performance of the conductive portion (410) is enhanced by the insulating cover portion (420), and the risk of electric shock or short circuit can be suppressed.

[0090] The shape of the insulating cover portion (420) may be provided in a hexagonal grid shape, a cross shape, a diagonal shape, or a zigzag shape, depending on the arrangement structure of the plurality of battery cells (100). For example, the shape of the insulating cover portion (420) may be provided in a hexagonal grid shape depending on the arrangement structure of the plurality of battery cells (100).

[0092] Meanwhile, the insulating cover portion (420) may be configured to partition the filling member (300). That is, the insulating cover portion (420) may serve not only the function of insulating the conductive portion (410) but also the function of partitioning and separating the filling member (300).

[0093] The insulating cover portion (420) can divide the filling member (300) into multiple regions. That is, the insulating cover portion (420) can be formed in a structure that controls the shape and thickness distribution of the filling member (300) at a position corresponding to the busbar assembly (400).

[0094] Referring to FIGS. 5 and 6, the upper surface of the insulating cover portion (420) may be positioned at the same height as or lower than the upper surface of the filling member (300). That is, the insulating cover portion (420) may have a structure that does not protrude above the upper surface of the filling member (300). Accordingly, a protruding interference structure may not be formed when viewed from above.

[0095] For example, the insulating cover portion (420) may be formed in the form of a rib or partition to separate the filling member (300) into a plurality of independent regions. Accordingly, the continuous formation of the filling member (300) can be blocked, and a segmented structure can be formed for each region.

[0096] For example, that is, the filling member (300) in the area directly corresponding to the busbar assembly (400) may be formed with a relatively thin thickness due to the protruding shape or height constraints of the busbar assembly (400). This thin area may function as a vulnerable area that is relatively easy to break due to lower mechanical strength compared to the surrounding area.

[0097] Accordingly, with reference to FIG. 7, when a thermal event occurs in the battery cell (100), the filling member (300) facing the battery cell (100) where the event occurred may be fractured in a shape corresponding to the insulating cover portion (420). That is, when a thermal event occurs, stress is concentrated along the boundary line corresponding to the outer shape or protrusion pattern of the busbar assembly (400) in the filling member (300), and it is highly likely that fracture will be induced along that area. When a thermal event occurs, a plurality of areas of the filling member (300) may be individually and selectively separated or opened.

[0098] In a structure where a battery cell (100) is embedded in a filling member (300), if a thermal event such as thermal runaway occurs in one battery cell (100), there is a possibility that the filling member (300) located above the adjacent battery cell (100) may be lifted up together, thereby causing convection or an electrical short circuit between the battery cells (100). Such lifting phenomenon can be one of the main causes of heat and flames rapidly transferring to adjacent battery cells (100).

[0099] According to the above embodiment of the present invention, the insulating cover portion (420) partitions the filling member (300) so that the filling member (300) may be locally ruptured when a thermal event occurs. That is, even if the filling member (300) located above the battery cell (100) where the thermal event occurred is ruptured or lifted upward, the filling member (300) in another area partitioned by the insulating cover portion (420) does not lift upward and can continuously maintain a state of close contact with the upper part of the adjacent battery cell (100).

[0100] Therefore, by preventing the filling member (300) from continuously deforming up to the top of the adjacent battery cell (100), the possibility of heat transfer by convection or electrical short circuit can be reduced. As a result, heat transfer between adjacent battery cells (100) is blocked, thereby suppressing the thermal diffusion rate of the entire battery pack (1) and preventing thermal explosion.

[0101] Additionally, the venting gas or flame can be induced to be discharged directly to the outside through the opening of the filling member (300), and the lateral diffusion of the gas can be minimized. Thus, the thermal and mechanical transfer path between the battery cell (100) where the thermal event occurred and an adjacent battery cell (100) can be blocked.

[0103] The insulating cover portion (420) may be provided with an insulating material. The insulating cover portion (420) may include a fire-resistant material. That is, the insulating cover portion (420) may be formed of a material that can maintain its structure without deformation even in a high-temperature environment.

[0104] For example, the insulating cover portion (420) may be made of PEEK (Polyether Ether Ketone) material. The PEEK material has excellent insulating properties and can maintain mechanical strength even at high temperatures. In addition, it can suppress shape collapse even in high-temperature situations such as thermal runaway. That is, the PEEK material has excellent mechanical strength, so it may have minimal deformation due to external forces. Consequently, according to the above embodiment of the present invention, the insulating cover portion (420) can simultaneously secure insulating performance, heat resistance performance, and structural stability.

[0106] FIG. 8 is a perspective view showing a busbar assembly according to an embodiment of the present invention. FIG. 9 is a cross-sectional view of the busbar assembly of FIG. 8 according to an embodiment of the present invention, cut along A-A'. FIG. 10 is a cross-sectional view of the busbar assembly of FIG. 8 according to an embodiment of the present invention, cut along B-B'.

[0107] The insulating cover portion (420) may be a closed-loop shape positioned between adjacent battery cells (100). Specifically, the insulating cover portion (420) may be formed continuously along the outer circumference of the battery cell (100). The insulating cover portion (420) may be formed as a closed-loop structure in the shape of a ring or frame surrounding the battery cell (100).

[0108] Additionally, the insulating cover portion (420) may have a shape in which at least a portion of a plurality of adjacent closed-loop structures are connected to each other. That is, the insulating cover portion (420) may include a plurality of adjacent closed-loop structures. The insulating cover portion (420) may form a network structure in which a plurality of closed-loop structures are connected. The insulating cover portion (420) may be formed in a shape in which adjacent closed-loop structures are connected to each other. That is, individual closed-loop structures may not be completely separated but may be continuously connected in some sections.

[0109] A single closed-loop structure may correspond to at least one battery cell (100). That is, a single closed-loop structure may be formed based on one battery cell (100). Specifically, referring to FIGS. 3 and 4, a single closed-loop structure may be arranged to correspond vertically to one battery cell (100). That is, each battery cell (100) may be surrounded by an individual closed-loop structure. Accordingly, independent structural compartments may be formed on a battery cell (100) basis. Additionally, individual protection and control structures may be formed for each battery cell (100). However, the shape and size of the closed-loop structure are not limited by the above embodiment. That is, they may be varied depending on the design purpose or the arrangement structure of the battery cells (100). For example, a single closed-loop structure may be formed to correspond to a plurality of battery cells (100). That is, a single closed-loop structure can be formed to surround two or more battery cells (100) simultaneously. In this case, a partition structure that groups multiple battery cells (100) into one group can be formed. Additionally, thermal control or structural support can be provided on a group basis.

[0110] According to the above embodiment of the present invention, since the insulating cover portion (420) is formed in a closed-loop shape, when a break occurs in the filling member (300) due to an increase in internal pressure or thermal runaway in the battery cell (100), the break can occur uniformly along the perimeter of the battery cell (100). That is, the phenomenon of the break pressure decreasing or increasing only at specific locations is suppressed, so that a similar break pressure can be maintained over the entire perimeter.

[0111] In addition, thermal energy and gas generated inside the battery cell (100) can be released evenly in all directions around the circumference of the battery cell (100) without being concentrated in a specific direction. Accordingly, localized heat concentration or flame eruption can be prevented, and heat transfer to adjacent components can be suppressed more effectively.

[0112] As a result, by inducing the release of heat and gas evenly, it is possible to provide the effect of improving the safety and reliability of the battery pack.

[0114] The insulating cover portion (420) may have a symmetrical structure with respect to the winding axis of the battery cell (100). The insulating cover portion (420) may be formed continuously along the entire circumferential direction of the battery cell (100). That is, it may be formed uniformly over the entire circumference, rather than being concentrated only on one side or a specific direction of the battery cell (100).

[0115] According to the above embodiment of the present invention, the insulating cover portion (420) can prevent the function from becoming stronger or weaker only in a specific direction. In addition, similar mechanical properties and fracture conditions can be maintained in all directions around the circumference.

[0117] Specifically, the insulating cover portion (420) may be formed in a pattern in which a plurality of hexagonal grids are continuously connected. The insulating cover portion (420) may be formed along the edges of a virtual hexagonal shape covering a plurality of battery cells (100). A hexagonal pattern may be formed corresponding to the arrangement structure of the battery cells (100). That is, the insulating cover portion (420) may have a shape similar to a honeycomb structure.

[0118] The hexagonal grids are arranged adjacent to each other and can be formed so that some sides between adjacent grids are shared. Accordingly, the insulating cover portion (420) can form a continuous network structure.

[0119] Generally, the insulating cover portion (420) may have a shape similar to at least a part of a virtual hexagonal shape surrounding the battery cells (100), but may be formed with a structure in which at least one of the six sides of the hexagonal shape is open. That is, it may be formed with an open loop structure rather than a closed loop.

[0120] In contrast, according to the above embodiment of the present invention, the hexagonal shape can be formed as a closed loop structure. That is, a complete closed loop structure can be formed in which all sides of the hexagon are connected. Accordingly, each hexagonal grid can function as an independent closed loop structure.

[0121] Therefore, uniform structural conditions can be formed in each grid. In addition, the stiffness of each grid can be enhanced by the closed-loop structure. Furthermore, the closed-loop structure can induce uniform fracture behavior throughout the entire perimeter. In other words, it is possible to prevent fracture from occurring only at specific edges.

[0122] As a result, the insulating cover portion (420) can simultaneously secure structural stability and heat dissipation uniformity through a hexagonal closed-loop grid structure.

[0124] Referring to FIGS. 3 to 10, the insulating cover portion (420) may have a first region (421) and a second region (422). The first region (421) and the second region (422) may be connected to each other and formed integrally.

[0125] Referring to FIG. 9, the first region (421) may be positioned to cover the conductive portion (410). That is, the first region (421) may be an area for covering the conductive portion (410) that electrically connects the battery cell (100). The first region (421) may be formed in an open loop shape. The first region (421) may be a partial loop structure that is not completely closed.

[0126] The first region (421) can simultaneously perform an insulating function and a partitioning function for the filling member (300). The first region (421) can ensure electrical insulation between the conductive part (410) and the external components. Additionally, the first region (421) can act as a boundary structure that limits the shape and placement area of ​​the filling member (300).

[0127] The second region (422) is formed as an extension from the first region (421) and can connect multiple first regions (421). The second region (422) can function as a connecting part that integrates individually separated first regions (421) into a single structure. The second region (422) may be an auxiliary component for forming a closed-loop shape. The second region (422) can connect the first regions (421) to form an overall closed-loop structure.

[0128] The second region (422) may not perform a direct function for insulating the conductive part (410). That is, the second region (422) may be an area primarily for structural formation and partitioning functions. The second region (422) may be a part formed for the purpose of partitioning the filling member (300) without the purpose of insulating the busbar.

[0129] For convenience of explanation, in FIGS. 3, 4, and 8, the first region (421) may be shown as unshaded white. The second region (422) may be shown as shaded gray. However, this is merely a representation for structural distinction and explanation, and the actual first region (421) and second region (422) may be a single unit.

[0131] Referring to FIG. 9, the first region (421) of the insulating cover portion (420) may be provided with an upper cover (4211) and a lower cover (4212). The insulating cover portion (420) may be provided as a pair having mutually corresponding shapes and sizes in the vertical direction (Z-axis direction) of the battery pack (1) and may be combined with each other. Here, the conductive portion (410) may be provided on the upper side of the insulating cover portion (420) or inserted into the pair of insulating cover portions (420).

[0132] The upper cover (4211) can cover the upper side of the conductive portion (410). The lower cover (4212) can cover the lower side of the conductive portion (410). The upper cover (4211) and the lower cover (4212) may have substantially the same or similar shape.

[0134] At this time, the vertical thickness (h21, h22) of the upper cover (4211) and / or lower cover (4212) may be formed to be greater than the vertical thickness (h3) of the conductive part (410). That is, the insulating cover part (420) may be formed to be relatively thicker than the conductive part (410).

[0135] The thickness (h21, h22) of the insulating cover portion (420) can be set to function as a boundary wall based on the space where the filling member (300) is formed. That is, the insulating cover portion (420) can function as a physical barrier that restricts the flow of the filling member (300) and partitions it into a specific area. As the insulating cover portion (420) is formed thicker than the conductive portion (410), the filling member (300) can be formed within an area more clearly partitioned by the insulating cover portion (420). In other words, it can prevent the filling member (300) from overflowing into or mixing with adjacent areas.

[0136] In addition, the insulating cover portion (420) can form a more distinct separation boundary of the filling member (300) due to the difference in thickness. Accordingly, the filling member (300) can maintain a stable state of being separated into multiple regions.

[0137] For example, the vertical thickness (h1) of the busbar assembly (400), including the conductive portion (410) and the insulating cover portion (420), may be approximately 1.5 mm or more and 3 mm or less. For example, the vertical thickness (h1) of the busbar assembly (400) may be approximately 2 mm or more and 2.6 mm or less.

[0138] According to the above embodiment of the present invention, by forming the insulating cover portion (420) thicker than the conductive portion (410), the compartments of the filling member (300) can be separated more clearly and reliably, and structural stability and safety can be improved simultaneously.

[0140] Meanwhile, referring to FIG. 10, the second region (422) of the insulating cover portion (420) may be a region that does not directly cover the conductive portion (410). That is, the second region (422) may be formed not for the purpose of insulating the conductive portion (410), but as a region for structural connection and partition formation. Accordingly, the second region (422) does not need to be formed separately in the vertical direction like the upper cover (4211) and the lower cover (4212), and may be formed as an integrated structure.

[0141] The second region (422) can be simply formed into a plate shape or a rib shape of a single thickness. That is, the second region (422) may have a structurally different shape from the first region (421). While the first region (421) may have a double structure or a separated structure for insulating the conductive part (410), the second region (422) may be formed into an integral structure for structural simplification and connectivity.

[0142] Consequently, according to the above embodiment of the present invention, the first region (421) and the second region (422) can be designed with different structures depending on their functions, thereby allowing the insulation function and the partitioning function of the filling member (300) to be optimized and implemented, respectively.

[0144] FIG. 11 is a cross-sectional view showing the busbar assembly of FIG. 9 and FIG. 10 side by side according to one embodiment of the present invention.

[0145] Referring to FIG. 11, the vertical thickness (h1) of the busbar assembly (400), including the first region (421) of the insulating cover portion (420), and the vertical thickness (h23) of the second region (422) of the insulating cover portion (420) may be substantially the same. The vertical thickness of the busbar assembly (400) may be uniform throughout. Accordingly, the busbar assembly (400) may form a structure without a step in the vertical direction.

[0146] Specifically, the upper surface of the second region (422) may be located on the same plane as the upper surface of the upper cover (4211) of the first region (421). The lower surface of the second region (422) may be located on the same plane as the lower surface of the lower cover (4212) of the first region (421). That is, the first region (421) and the second region (422) may have a structure in which they are aligned with respect to the upper surface and also aligned with respect to the lower surface.

[0147] Accordingly, the insulating cover portion (420) can form an overall flat shape. Due to this planar alignment structure, the manufacturing and assembly process of the insulating cover portion (420) can be facilitated.

[0148] Meanwhile, when the first region (421) and the second region (422) are formed integrally, the insulating cover portion (420) may be formed in a 'U' shape, excluding the space into which the conductive portion (410) is inserted. That is, the area where the conductive portion (410) is located is open, and the remaining area may be formed in a continuous structure.

[0149] According to the above embodiment of the present invention, the insertion position of the conductive part (410) can be structurally defined. That is, the user can intuitively recognize the position where the conductive part (410) should be inserted. In addition, the second region (422) can function as a stopper that limits the position when the conductive part (410) is inserted. That is, it can prevent the conductive part (410) from being inserted excessively. Accordingly, the insertion depth and position alignment of the conductive part (410) can be controlled more accurately. In addition, it can prevent mis-insertion or position deviation during assembly.

[0150] Meanwhile, the first region (421) and the second region (422) may not be formed integrally, but may be formed as separate components and then joined together. That is, they may be formed as a modular structure and then joined through an assembly process. The joining method may be, for example, a snap-fit, a snap-fit, a clip-fit, or a heat-fusion joining method. Additionally, bonding by adhesive or ultrasonic welding may be applied as needed. Due to such a joining structure, the manufacturing process of the first region (421) and the second region (422) can be separated. Furthermore, the shape of each can be optimized and designed.

[0152] FIG. 12 is a cross-sectional view showing the busbar assembly of FIG. 9 and FIG. 10 side by side according to another embodiment of the present invention.

[0153] The vertical thickness (h1) of the busbar assembly (400), including the first region (421) of the insulating cover portion (420), may be greater than the vertical thickness (h23) of the second region (422) of the insulating cover portion (420). The portion where the first region (421) is formed may be relatively thick, and the second region (422) may have a relatively thin thickness.

[0155] Referring to FIG. 12, the second region (422) of the insulating cover portion (420) may be in the form of an upper cover (4211) of the first region (421) extended in a horizontal direction. The second region (422) may be formed integrally with the upper cover (4211) of the first region (421). That is, the second region (422) may not be formed as a separate part, but may be formed as an extension of the upper cover (4211). In other words, it may be provided as a single member without a separate connection process.

[0156] The upper surface of the second region (422) may be located on the same plane as the upper surface of the upper cover (4211) of the first region (421). That is, the upper surface of the insulating cover portion (420) may form a generally flat structure.

[0157] Additionally, the second region (422) may be formed to be thinner in the downward direction compared to the first region (421). The insulating cover portion (420) may have a thickness difference based on the lower surface while maintaining the same plane on the upper surface.

[0159] Meanwhile, the insulating cover portion (420) may further be provided with a protrusion (423) to protect the side of the conductive portion (410). The protrusion (423) may be formed to extend downward from the lower surface of the second region (422). The protrusion (423) may have a structure protruding from the lower part of the second region (422) extending from the upper cover (4211). The protrusion (423) may be formed in a shape that wraps around or shields the side of the conductive portion (410). Accordingly, the conductive portion (410) can be protected from external impact in the lateral direction.

[0160] In addition, direct contact between the conductive part (410) and adjacent components can be prevented. Furthermore, the protrusion (423) can function as a guide that limits the position of the conductive part (410). That is, it can perform the role of aligning the insertion position and placement position of the conductive part (410).

[0161] Meanwhile, the upper cover (4211), the conductive part (410), and the lower cover (4212), which are integrally formed with the second region during assembly, can be assembled by sequentially stacking them. That is, a complex coupling structure or additional fastening process may not be required.

[0162] According to the above embodiment of the present invention, the insulating cover portion (420) can simplify manufacturing and assembly while maintaining the compartmentalization function of the filling member (300).

[0163] Specifically, as the upper surfaces of the first region (421) and the second region (422) are formed on the same plane as described above, the gap between the upper surface of the filling member (300) and the upper surface of the insulating cover part (420) can be maintained at a constant level. That is, the height at which the filling member (300) is formed can be uniformly controlled. Accordingly, the filling member (300) can maintain a state of being stably partitioned by the insulating cover part (420). In addition, it is possible to prevent the filling member (300) from shifting toward a specific area or overflowing.

[0164] In addition, since assembly can be completed simply by sequentially stacking the upper cover (4211), the conductive part (410), and the lower cover (4212) during assembly, the assembly process can be simplified and the number of parts can be reduced. Furthermore, assembly time can be shortened and assembly errors can be reduced. Therefore, the manufacturing process can be simplified and production efficiency can be improved.

[0166] FIG. 13 is a cross-sectional view of FIG. 4 taken along line D-D' according to another embodiment of the present invention.

[0167] The height of the upper surface of the insulating cover portion (420) may be higher than the height of the upper surface of the filling member (300). That is, the insulating cover portion (420) may have a structure that protrudes upward above the filling member (300).

[0168] At this time, the vertical thickness of the upper cover (4211) can be formed to be greater than the vertical thickness of the lower cover (4212). That is, the partitioning function in the upper direction can be further enhanced.

[0169] According to the above embodiment of the present invention, the insulating cover portion (420) can effectively prevent the filling member (300) from overflowing into an adjacent area. In addition, the partitioning function in the upward direction can be further enhanced.

[0171] Meanwhile, the insulating cover portion (420) may be positioned so as to be spaced apart from the pack lid (220). That is, the upper surface of the insulating cover portion (420) may be set so as not to come into direct contact with the pack lid (220). The height of the insulating cover portion (420) may not be formed to the extent that it comes into contact with the pack lid (220). That is, a predetermined gap may be formed between the insulating cover portion (420) and the pack lid (220).

[0172] The above-mentioned separation space can function as a venting path (VP). That is, it can form a venting path (VP) through which gas generated from the battery cell (100) can move upward. In particular, when a thermal event occurs, the venting gas can be discharged upward along the venting path (VP). That is, the gas can be discharged smoothly without being blocked by a specific structure.

[0173] According to the above embodiment of the present invention, blockage of the venting path (VP) can be prevented by limiting the insulating cover portion (420) from being formed excessively high. Consequently, according to the above embodiment of the present invention, the insulating cover portion (420) can secure a venting gas discharge path while reinforcing the compartmentalization function of the filling member (300). That is, structural stability and safety can be satisfied simultaneously.

[0175] And, referring to FIG. 2, a battery pack (1) according to one embodiment of the present invention may further include a cooling plate (600). The cooling plate (600) may be configured to cool the battery cell (100). The cooling plate (600) may be provided inside the pack housing (200). The cooling plate (600) may be provided on one side of the battery cell (100). For example, as in the embodiment shown in FIG. 2, the cooling plate (600) may be provided on the lower part of the battery cell (100).

[0177] Meanwhile, in the drawings of the present invention, components such as power terminals of the battery pack (1) have been omitted for the convenience of drawing. Additionally, the battery pack (1) may further include various components, such as components of the battery pack (1) known at the time of filing the present invention, such as a BMS, relay, current sensor, etc.

[0179] FIG. 14 is an overall perspective view of a battery cell (100) included in a battery pack according to one embodiment of the present invention, and FIG. 15 is a cross-sectional perspective view of a battery cell (100) included in a battery pack according to one embodiment of the present invention.

[0180] Referring to FIGS. 14 and 15, the battery cell (100) may include an electrode assembly (10), a battery housing (20), a first electrode terminal (30), and a second electrode terminal (20a). The battery cell (100) may include the first electrode terminal (30) and the second electrode terminal (20a) on the same side. More specifically, the battery cell (100) may have the first electrode terminal (30) and the second electrode terminal (20a) provided on a bottom surface (21) provided on one side of the battery housing (20). For example, in a battery pack (1) according to one embodiment of the present invention, the bottom surface (21) of the battery cell (100) may be positioned to face upward.

[0181] The electrode assembly (10) may have, for example, a jelly-roll structure. That is, the electrode assembly (10) may be manufactured by winding a laminate formed by stacking a first electrode plate and a second electrode plate having a sheet shape at least once with a separator interposed between them in one direction with respect to the winding center (C). In this case, an additional separator may be provided on the outer surface of the electrode assembly (10) to insulate it from the battery housing (20). Any structure of a wound electrode assembly (10) known in the art may be applied to the present invention without limitation.

[0182] The first electrode comprises a first electrode plate and a first electrode active material applied on one or both sides of the first electrode plate. The first electrode includes a first uncoated portion along the winding direction in which the active material layer is not coated. That is, an uncoated portion in which the first electrode active material is not coated exists at one end in the width direction (direction parallel to the Z-axis) of the first electrode plate. The uncoated portion functioning as a first electrode tab is hereinafter referred to as the first uncoated portion (11). The first uncoated portion (11) may be provided on the upper side in the height direction (direction parallel to the Z-axis) of the electrode assembly (10) housed within the battery housing (20). That is, the first electrode plate includes a first uncoated portion (11) in which the active material layer is not coated at the long end and is exposed to the outside of the separator, and a part of the first uncoated portion (11) is used as an electrode tab itself. The first uncoated portion (11) may be, for example, a positive electrode tab.

[0183] The second electrode comprises a second electrode plate and a second electrode active material applied on one or both sides of the second electrode plate. At the other end of the second electrode plate in the width direction (direction parallel to the Z-axis), there exists a non-exposed portion where the second electrode active material is not applied. The non-exposed portion functioning as a second electrode tab is hereinafter referred to as the second non-exposed portion (12). The second non-exposed portion (12) may be provided at the lower end in the height direction (direction parallel to the Z-axis) of the electrode assembly (10) housed within the battery housing (20). That is, the second electrode plate includes a second non-exposed portion (12) that is exposed to the outside of the separator and where the active material layer is not coated at the long end, and at least a portion of the second non-exposed portion (12) is used as an electrode tab itself. The second non-exposed portion (12) may be, for example, a negative electrode tab.

[0184] The first non-removable portion (11) and the second non-removable portion (12) may be extended in opposite directions along the height direction (a direction parallel to the Z-axis) of the battery cell (100). The first non-removable portion (11) may be extended toward the bottom surface (21) of the battery housing (20), and the second non-removable portion (12) may be extended toward the opening of the battery housing (20).

[0185] In the present invention, the positive active material coated on the positive plate and the negative active material coated on the negative plate may be used without limitation as long as they are active materials known in the art.

[0186] The battery housing (20) is a cylindrical receptacle with an opening formed on one side and is made of a conductive metal material. For example, steel, stainless steel, or nickel-plated steel may be used as the material of the battery housing (20). The upper surface located opposite the opening is referred to as the bottom surface (21). That is, the bottom surface (21) may be provided on one side of the battery housing (20).

[0187] The side wall and bottom surface (21) of the battery housing (20) may be formed integrally. Alternatively, the side wall and bottom surface (21) of the battery housing (20) may be provided separately from each other and joined together by welding or the like. The top surface (a surface parallel to the XY plane), i.e., the bottom surface (21), of the battery housing (20) may have a roughly flat shape. The battery housing (20) accommodates an electrode assembly (10) through an opening formed on one side and may also accommodate an electrolyte.

[0188] The battery housing (20) can be electrically connected to the electrode assembly (10). The battery housing (20) can be electrically connected, for example, to the second non-electrode portion of the electrode assembly (10). In this case, the battery housing (20) can have the same polarity as the second non-electrode portion. Thus, the bottom surface (21) of the battery housing (20) can function as a second electrode terminal (20a). For example, the second electrode terminal (20a) can be a negative electrode terminal.

[0189] The first electrode terminal (30) may be made of a conductive metal material. It may pass through the upper surface of the battery housing (20) and be electrically connected to the first non-conductive portion (11) of the electrode assembly (10). Thus, the first electrode terminal (30) may have a first polarity. The first electrode terminal (30) may be electrically insulated from the battery housing (20) having a second polarity. The first electrode terminal (30) may be rivet-bonded to the inner surface of the battery housing (20). The first electrode terminal (30) may be configured in a circular shape. Specifically, the area of ​​the first electrode terminal (30) exposed to the outside of the upper surface of the battery housing (20) may be configured in the shape of a roughly circular plate. At this time, the first electrode terminal (30) may be configured in a circular shape having a radius.

[0190] A step may be formed between the first electrode terminal (30) and the upper surface of the battery housing (20). Specifically, when the entire upper surface of the battery housing (20) has a flat shape, the first electrode terminal (30) may protrude further upward than the upper surface of the battery housing (20).

[0191] An insulating gasket (60) may be interposed between the battery housing (20) and the first electrode terminal (30). The insulating gasket (60) may be configured to prevent the battery housing (20) and the first electrode terminal (30), having opposite polarities, from coming into contact with each other. Thus, the bottom surface (21) of the battery housing (20), which has a roughly flat shape, can function as the second electrode terminal (20a) of the battery cell (100). The entire remaining area of ​​one side of the battery housing (20), excluding the area occupied by the first electrode terminal (30) and the insulating gasket (60), corresponds to the second electrode terminal (20a), which has opposite polarity to the first electrode terminal (30).

[0192] That is, a battery cell (100) according to one embodiment of the present invention may be provided with a first electrode terminal (30) having a first polarity on one side in the length direction (a direction parallel to the Z-axis) and a second electrode terminal (20a) having a second polarity that is electrically insulated from the first electrode terminal (30).

[0193] In other words, in a battery cell (100) according to one embodiment of the present invention, since a pair of electrode terminals (30, 20a) are located in the same direction, when electrically connecting a plurality of battery cells (100), it is possible to place an electrical connection component, such as the following busbar assembly (400), on only one side of the plurality of battery cells (100). This can lead to simplification of the battery pack (1) structure and improvement of energy density.

[0194] A battery cell (100) according to one embodiment of the present invention may be provided with an insulator (40). The insulator (40) may be interposed between the positive current collector and the inner surface of the bottom surface (21) of the battery housing (20) so as to prevent contact between the battery housing (20) and the positive current collector having opposite polarities.

[0195] A battery cell (100) according to one embodiment of the present invention may have a lead (50). The lead (50) may be configured to cover an opening of a battery housing (20). The lead (50) may be configured to have, for example, a roughly plate shape. The lead (50) may be coupled to an opening of the battery housing (20). For example, the lead (50) may be seated on the upper edge of an opening of the battery housing (20).

[0196] Meanwhile, the battery cell (100) may be provided with a venting section (20V). The venting section (20V) may be formed to prevent an increase in internal pressure caused by gas generated inside the battery housing (20). The venting section (20V) may be provided in the battery housing (20). For example, the venting section (20V) may be provided on the bottom surface (21) of the battery housing (20). Alternatively, the venting section (20V) may be provided in the lead (50).

[0197] The venting section (20V) may have a thinner thickness compared to the surrounding area of ​​the battery housing (20). For example, the venting section (20V) may be configured in a notched shape. The venting section (20V) may be configured to be structurally weaker compared to the surrounding area. Therefore, if an abnormality occurs in the battery cell (100) and the internal pressure increases above a certain level, the venting section (20V) may rupture, allowing the gas generated inside the battery housing (20) to be discharged. That is, during venting, the internal area of ​​the venting section (20V) is opened relative to the venting section (20V), thereby allowing for smooth venting.

[0198] The venting portion (20V) may be formed continuously in a circular shape on the bottom surface (21) or lead (50) of the battery housing (20). For example, the venting portion (20V) may be formed as a circle with a radius. However, it is not limited thereto, and the venting portion (20V) may be formed discontinuously in a circular shape on the bottom surface (21) or lead (50) of the battery housing (20), or may be formed in a straight line shape or other shapes.

[0199] The filling member (300) may be configured to be separated from the battery cell (100) or at least partially ruptured together with the venting portion (20V) when the battery cell (100) is vented.

[0200] When the pressure rises rapidly in a trigger battery cell (100) in which thermal runaway is induced, the pressure and energy discharged from the venting portion (20V) of the trigger battery cell (100) act on the filling member (300) at the top of the battery cell (100), and as a result, the filling member (300) may be lifted or detached.

[0202] FIG. 16 is a schematic perspective view of a vehicle including a battery pack according to one embodiment of the present invention.

[0203] Referring to FIG. 16, a vehicle (V) according to one embodiment of the present invention may include a battery pack (1) according to one embodiment of the present invention. The vehicle (V) according to the present invention may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. The vehicle (V) includes four-wheeled vehicles and two-wheeled vehicles. The vehicle (V) may operate by receiving power from the battery pack (1) according to one embodiment of the present invention.

[0204] FIG. 17 is a drawing showing a container according to one embodiment of the present invention.

[0205] Referring to FIG. 17, the container system may include a plurality of battery packs (1). The plurality of battery packs (1) may be physically or electrically connected.

[0206] The pack housing (200) may be configured to be stackable or combined with the pack housing (200) of another battery pack (1). Additionally, the container system may additionally include a control module. The control module may be fastened, combined, connected, stacked, or fixed to the battery pack (1).

[0207] The control module can be electrically connected to a plurality of battery packs (1) included in the container system. The control module can control the charging and discharging of the plurality of battery packs (1). In addition, the control module can obtain status information of the plurality of battery packs (1).

[0208] In addition, the container system may be configured to additionally include a firefighting module for controlling thermal events.

[0209] An energy storage system (ESS) (E) according to the present invention may include a battery pack (1) according to the present invention. The energy storage system (E) may include a plurality of container systems. And the container system may include a plurality of battery packs (1). Such an energy storage system (E) may form a link group with a combination of a certain number of battery packs (1) and control modules.

[0210] Although the present invention has been described above by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs. Explanation of the symbols

[0212] E: Energy storage system V : Car 1 : Battery pack 100 : Battery cell 20: Battery housing 30: First electrode terminal 20a: Second electrode terminal 20V: Venting part 200 : Pack Housing 210 : Main body 220: Pack Lead 300 : Filling member 400 : Busbar Assembly 410 : Challenge Section 411: First electrode connection part 412 : Second electrode connection part 420: Insulating cover part 421: Zone 1 4211 : Top cover 4212 : Bottom cover 422 : Second Zone 600 : Cooling plate

Claims

Claim 1 A battery pack comprising: a plurality of battery cells; a pack housing for accommodating the plurality of battery cells; a filling member configured to fill at least a portion of the internal space of the pack housing; and a busbar assembly having a conductive portion configured to electrically connect the plurality of battery cells and an insulating cover portion configured to cover the conductive portion or partition the filling member. Claim 2 A battery pack according to claim 1, characterized in that, when a thermal event occurs in the battery cell, the filling member facing the battery cell where the event occurred is configured to break into a shape corresponding to the insulating cover portion. Claim 3 A battery pack according to claim 1, wherein the insulating cover portion is a closed-loop shape disposed between adjacent battery cells. Claim 4 A battery pack according to claim 1, wherein the insulating cover portion has a symmetrical structure with respect to the winding axis of the battery cell. Claim 5 A battery pack according to claim 1, wherein the insulating cover portion is a pattern in which a plurality of hexagonal grids are continuously connected. Claim 6 A battery pack according to claim 1, wherein the insulating cover portion comprises: a first region covering the conductive portion; and a second region extending from the first region and connecting a plurality of first regions. Claim 7 A battery pack according to claim 6, wherein the first region of the insulating cover portion comprises an upper cover covering the upper side of the conductive portion; and a lower cover covering the lower side of the conductive portion. Claim 8 A battery pack according to claim 7, characterized in that the vertical thickness of the upper cover is greater than the vertical thickness of the conductive part. Claim 9 A battery pack according to claim 1, characterized in that the vertical thickness of the busbar assembly is 1.5 mm or more and 3 mm or less. Claim 10 A battery pack according to claim 6, characterized in that the vertical thickness of the busbar assembly including the first region of the insulating cover portion and the vertical thickness of the second region of the insulating cover portion are the same. Claim 11 A battery pack according to claim 7, wherein the second region is in the form in which the upper cover of the first region is extended in a horizontal direction. Claim 12 A battery pack according to claim 11, wherein the insulating cover portion further comprises a protrusion for protecting the side of the conductive portion. Claim 13 A battery pack according to claim 1, wherein the insulating cover portion comprises a fire-resistant material. Claim 14 A battery pack according to claim 1, wherein the insulating cover portion comprises PEEK. Claim 15 A battery pack according to claim 1, characterized in that the height of the upper surface of the insulating cover portion is higher than the height of the upper surface of the filling member. Claim 16 A battery pack according to claim 1, characterized in that the height of the upper surface of the insulating cover portion is higher than the height of the upper surface of the filling member. Claim 17 A battery pack according to claim 1, wherein the pack housing has a pack lead covering the upper side of the battery cell, and the insulating cover portion is positioned to be spaced apart from the pack lead. Claim 18 An automobile comprising a battery pack according to any one of paragraphs 1 through 17. Claim 19 An energy storage system comprising a battery pack according to any one of claims 1 to 17.

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