Battery pack and device including same

Abstract

A battery pack according to an embodiment of the present invention comprises: a plurality of battery cells; a pack frame comprising a bottom frame and side frames forming a receiving space in which the battery cells are received; a spacer positioned on the bottom frame and on which the battery cells are mounted; a holding frame positioned on the spacer and having holes into which the battery cells are inserted; and a refrigerant which flows in the space between the spacer and the holding frame so as to directly cool the battery cells inside the pack frame.

Description

Battery pack and device including same

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0013809, filed January 30, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a battery pack and a device including the same, and more specifically, to a battery pack using an immersion cooling method and a device including the same.

[0004] As technological developments and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing. Accordingly, extensive research is being conducted on secondary batteries that can meet diverse needs.

[0005] Secondary batteries are attracting much attention not only as an energy source for mobile devices such as cell phones, digital cameras, and laptops, but also as a power source for power devices such as electric bicycles, electric cars, and hybrid electric vehicles.

[0006] Recently, as the need for large-capacity secondary battery structures has increased, including the use of secondary batteries as energy storage sources, the demand for battery packs that combine multiple secondary batteries is increasing.

[0007] Meanwhile, when configuring a battery pack by connecting multiple battery cells in series / parallel, it is common to configure the battery pack by arranging the multiple battery cells within a pack frame and adding other components.

[0008] Since these battery cells are composed of rechargeable secondary batteries, these high-power, large-capacity secondary batteries generate a large amount of heat during the charging and discharging process. In this case, the heat from multiple battery cells accumulates in a small space, causing the temperature to rise rapidly and severely. In other words, while a battery pack containing multiple battery cells can achieve high output, it is difficult to remove the heat generated by the cells during charging and discharging. If the heat dissipation of the battery cells is not properly performed, the deterioration of the cells will be accelerated, shortening their lifespan and increasing the risk of explosion or fire.

[0009] Moreover, vehicle battery packs are frequently exposed to direct sunlight and may be subjected to high-temperature conditions, such as summer or desert regions. Furthermore, because multiple battery modules are densely packed to increase vehicle range, flames or heat generated from a single battery cell can easily spread to neighboring cells, ultimately leading to fire or explosion within the battery pack itself. Therefore, to effectively cool high-capacity battery packs, immersion cooling, in which a refrigerant directly cools the cells within the pack, is being utilized.

[0010] The problem to be solved by the present invention is to provide a battery pack and a device including the same that can prevent leakage of the coolant while improving cooling performance through immersion cooling that directly cools battery cells using a coolant.

[0011] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0012] According to one embodiment of the present invention, a battery pack comprises: a pack frame including a plurality of battery cells; a bottom frame and a side frame forming a storage space in which the battery cells are stored; a spacer positioned above the bottom frame and on which the battery cells are mounted; a holding frame positioned above the spacer and having holes formed into which the battery cells are inserted; and a coolant flowing in a space between the spacer and the holding frame to directly cool the battery cells within the pack frame.

[0013] A first waterproof adhesive may be applied to the upper portion of the above holding frame.

[0014] In an area above the holding frame, a bus bar guiding electrical connection of the battery cells can be connected to the electrode terminals of the battery cells.

[0015] At least a portion of the above busbar may be surrounded by a first waterproof adhesive.

[0016] The above battery pack may further include a pack upper cover covering the open upper portion of the pack frame. A first waterproof adhesive may be applied to the space between the holding frame and the pack upper cover.

[0017] A foam member may be provided on the lower surface of the upper cover of the pack.

[0018] A second waterproof adhesive may be applied to the surface of the above spacer facing the battery cells.

[0019] The battery pack may further include a pack lower cover covering the lower portion of the bottom frame. A joint line between the pack lower cover and the bottom frame may be formed along the outer perimeter of the area where the battery cells are located when viewed in the height direction.

[0020] The above battery cells may have a vent portion.

[0021] The vent portion of the above battery cell may face the spacer.

[0022] The spacer may include a spacer venting portion, which is a portion facing the vent portion; and an outer portion surrounding the spacer venting portion. The spacer venting portion may have a thinner thickness than the outer portion, or may have a notching groove.

[0023] A venting channel may be formed in the above bottom frame to guide venting gas or particles discharged from the vent portion of the battery cell.

[0024] The bottom frame may include a first frame and a second frame positioned below the first frame. The venting channel may be formed between the first frame and the second frame.

[0025] A through hole may be formed in the first frame. When viewed in the height direction, the through hole may be positioned so as to overlap at least a portion of the vent portion of the battery cell.

[0026] A vertical beam that divides the above battery cells into multiple battery cell groups may be positioned above the bottom frame.

[0027] The venting channel corresponding to one of the above battery cell groups may have an independent venting path that is not shared with the venting channel corresponding to another of the above battery cell groups.

[0028] The above venting channel can be communicated with a venting device provided in the side frame.

[0029] A device according to one embodiment of the present invention includes the battery pack.

[0030] According to embodiments of the present invention, in immersion cooling that directly cools battery cells using a coolant, the coolant flows in the area between the spacer in which the battery cells are mounted and the holding frame in which holes in which the battery cells are inserted are formed, so that the cooling performance is increased while the coolant is prevented from leaking to the outside.

[0031] Additionally, when a thermal event occurs in a battery cell, high-temperature venting gas, particles, or flames emitted from the battery cell are discharged to the outside of the battery pack by moving along a specific path intended in advance through the venting channel formed in the bottom frame.

[0032] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0033] Figures 1 and 2 are perspective views of a battery pack according to one embodiment of the present invention.

[0034] FIG. 3 is a perspective view showing a pack frame included in the battery pack of FIGS. 1 and 2.

[0035] Figure 4 is a perspective view showing an assembled state of battery cells, spacers, and holding frames according to one embodiment of the present invention.

[0036] FIG. 5 is a perspective view showing battery cells and a holding frame according to one embodiment of the present invention.

[0037] Figure 6 is an exploded perspective view of the battery cells and holding frame of Figure 5.

[0038] Figures 7 (a) and (b) are a perspective view and a side view, respectively, of a battery cell according to one embodiment of the present invention.

[0039] Fig. 8 is a cross-sectional view showing a cross-section taken along the cutting line AA in Fig. 7 (a).

[0040] Figure 9 is a cross-sectional view of a battery cell according to one embodiment of the present invention.

[0041] Figure 10 is a cross-sectional perspective view of a battery pack according to one embodiment of the present invention.

[0042] Figure 11 is an enlarged partial cross-sectional view of part “B” of Figure 10.

[0043] Figure 12 is an enlarged partial cross-sectional view of part “C” of Figure 11.

[0044] Figure 13 is a partial cross-sectional view showing an enlarged portion of “D” in Figure 11.

[0045] FIG. 14 is a perspective view showing battery cells and spacers according to one embodiment of the present invention.

[0046] Fig. 15 is an enlarged partial perspective view of a spacer according to one embodiment of the present invention.

[0047] Figure 16 is a cross-sectional perspective view of a pack frame according to one embodiment of the present invention.

[0048] Fig. 17 is a partial cross-sectional view showing an enlarged portion of “E” of Fig. 16.

[0049] Fig. 18 is a partial cross-sectional view showing an enlarged portion of “F” in Fig. 17.

[0050] FIG. 19 is a partial cross-sectional view of a battery pack according to another embodiment of the present invention.

[0051] Fig. 20 is a perspective view showing a pack frame according to one embodiment of the present invention with the first side frame excluded.

[0052] Figure 21 is an exploded perspective view of a bottom frame according to one embodiment of the present invention.

[0053] FIG. 22 is a plan view showing battery cells and welding lines around them according to one embodiment of the present invention.

[0054] Figure 23 is a plan view showing battery cells and a pack lower cover according to one embodiment of the present invention.

[0055] Fig. 24 is a partial perspective view showing a part of a bottom frame according to one embodiment of the present invention.

[0056] Fig. 25 is a partial perspective view showing the first frame removed from the bottom frame of Fig. 24.

[0057] Fig. 26 is a partial perspective view showing the separation frame removed from the bottom frame of Fig. 25.

[0058] Fig. 27 is a plan view showing a part of a bottom frame according to one embodiment of the present invention.

[0059] Fig. 28 is a plan view showing the first frame removed from the bottom frame of Fig. 27.

[0060] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0061] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0062] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0063] Furthermore, when we say that a layer, membrane, region, plate, or other part is "on" or "over" another part, this includes not only cases where it is "directly on" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly on" another part, it means that there are no other parts in between. Furthermore, saying that a part is "on" or "over" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "over" the direction opposite to gravity.

[0064] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0065] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0066] FIG. 1 and FIG. 2 are perspective views of a battery pack according to one embodiment of the present invention. FIG. 3 is a perspective view showing a pack frame included in the battery pack of FIG. 1 and FIG. 2. FIG. 4 is a perspective view showing an assembled state of battery cells, spacers, and a holding frame according to one embodiment of the present invention. FIG. 5 is a perspective view showing battery cells and a holding frame according to one embodiment of the present invention. FIG. 6 is an exploded perspective view of the battery cells and the holding frame of FIG. 5.

[0067] Referring to FIGS. 1 to 6 together, a battery pack (100) according to one embodiment of the present invention includes: a pack frame (200) including a bottom frame (210) and a side frame (220) that form a storage space in which the battery cells (110) are stored; a spacer (300) positioned on the upper portion of the bottom frame (210) and on which the battery cells (110) are mounted; a holding frame (400) positioned on the upper portion of the spacer (300) and having a hole (400H) formed in which the battery cells (110) are fitted; and a coolant flowing in the space between the spacer (300) and the holding frame (400) so as to directly cool the battery cells (110) inside the pack frame (200). That is, in the case of the battery pack (100) according to the present embodiment, it is not a conventional indirect cooling method in which a heat sink through which a coolant flows is provided in the battery pack, but rather an immersion cooling method in which a coolant flows inside the pack frame (200) and comes into contact with the battery cells (110) to directly cool the battery cells (110).

[0068] In the battery pack (100) according to the present embodiment, the coolant flows in the space between the spacer (300) and the holding frame (400) and is prevented from flowing into other spaces. That is, the spacer (300) and the holding frame (400) can define a space in which the coolant flows and prevent the coolant from leaking into other spaces. The spacer (300) corresponds to the lower limit of the coolant flow, and the holding frame (400) corresponds to the upper limit of the coolant flow. In this way, by preventing coolant leakage, the safety of the battery pack (100) can be enhanced along with its cooling performance.

[0069] Below, the battery cell (110) according to the present embodiment will be described in detail.

[0070] Figures 7(a) and 7(b) are perspective and side views, respectively, of a battery cell according to an embodiment of the present invention. Figure 8 is a cross-sectional view taken along the cutting line AA in Figure 7(a). Figure 9 is a cross-sectional view of a battery cell according to an embodiment of the present invention.

[0071] Referring to FIGS. 7 to 9 together, the battery cell (110) according to the present embodiments may have a vent part (110V). The vent part (110V) is a general term for a member or device provided in the battery cell (110) to discharge venting gas, etc. inside the battery cell (110).

[0072] For example, the battery cell (110) according to the present embodiment may be a cylindrical battery cell. Specifically, the battery cell (110) may include an electrode assembly (10); a battery can (20) that houses the electrode assembly (10) and has an open top; and a cap assembly (30) that is coupled to the open top of the battery can (20). A gasket (50) may be interposed between the battery can (20) and the cap assembly (30). Hereinafter, an exemplary structure of the battery cell (110) will be described, but the battery cell of the present invention is not limited to this structure.

[0073] The battery can (20) according to the present embodiment may be a cylindrical case with an open top, and may store an electrode assembly (10) and an electrolyte (not shown) in an internal storage space, and may include a metal material such as aluminum (Al).

[0074] The cap assembly (30) according to the present embodiment may include a top cap (31) having a plate shape and a connecting plate (32) electrically and mechanically connected to the top cap (31). The top cap (31) may include a metal material having electrical conductivity and may cover an open upper portion of the battery can (20). The top cap (31) may be electrically connected to a first segment (11) connected to a first electrode of the electrode assembly (10), and at the same time, may be electrically insulated from the battery can (20) by a gasket (50). Therefore, the cap assembly (30) according to the present embodiment including the top cap (31) may function as a first electrode terminal (111), which is an external terminal of the first electrode included in the electrode assembly (10).

[0075] Specifically describing the electrical connection between the top cap (31) and the first segments (11), the battery cell (110) according to the present embodiment may further include a first current collector (41) positioned on the upper portion of the electrode assembly (10). The first current collector (41) may include a conductive metal material such as aluminum, copper, steel, nickel, etc., and may be electrically connected to the first segments (11) of the electrode assembly (10). The electrical connection may be achieved through welding. A lead (60) may be connected to the first current collector (41). The lead (60) may extend upward from the electrode assembly (10) and be coupled to the connection plate (32). In another embodiment, the lead (60) may be directly coupled to the lower surface of the top cap (31). The coupling between the lead (60) and other components may be achieved through welding. Additionally, the first collector plate (41) may be formed integrally with the lead (60). In this case, the lead (60) may have a long plate shape extending outward from near the center of the first collector plate (41).

[0076] The first collector plate (41) may have a plurality of radially formed protrusions (not shown) on its lower surface. When the radially formed protrusions are provided, the first collector plate (41) may be pressed to press the protrusions into the bent first segments (11). The connection between the first collector plate (41) and the first segments (11) may be performed by, for example, laser welding. The laser welding may be performed by partially melting the base material of the first collector plate (41). In a variation, the welding between the first collector plate (41) and the first segments (11) may be performed with solder interposed. In this case, the solder may have a lower melting point compared to the first collector plate (41) and the first segments (11). The laser welding may be replaced by resistance welding, ultrasonic welding, spot welding, etc.

[0077] Meanwhile, the battery cell (110) according to the present embodiment may further include a second current collector (42) positioned at the bottom of the electrode assembly (10). Specifically, the second current collector (42) may be positioned between the electrode assembly (10) and the bottom (20F) of the battery can (20). The second current collector (42) may include a conductive metal material such as aluminum, copper, steel, nickel, etc., and may be electrically connected to the second segments (12) of the electrode assembly (10). One side of the second current collector (42) may be coupled to the second segments (12), and the opposite side of the second current collector (42) may be coupled to the bottom (20F) of the battery can (20). Welding may be applied to the coupling of the second current collector (42). Accordingly, the battery can (20) according to the present embodiment can function as a second electrode terminal (112), which is an external terminal of the second electrode included in the electrode assembly (10).

[0078] Meanwhile, the secondary battery according to the present embodiment may include an insulating plate (70). The insulating plate (70) may cover the first collector plate (41). The insulating plate (70) may cover the first collector plate (41) on the upper surface of the first collector plate (41), thereby preventing the first collector plate (41) from contacting the battery can (20), particularly the beading part (20B) of the battery can (20) described later. In addition, the insulating plate (70) may be provided with a separate lead hole so that a lead (60) extending upward from the first collector plate (41) may be drawn out. The lead (60) may be drawn out upward through the lead hole of the insulating plate (70) and coupled to the lower surface of the connecting plate (32) or the lower surface of the top cap (31).

[0079] The peripheral area of ​​the insulating plate (70) can be interposed between the first current collector (41) and the beading portion (20B) of the battery can (20), thereby fixing the assembly of the electrode assembly (10) and the first current collector (41). Accordingly, the assembly of the electrode assembly (10) and the first current collector (41) can be restricted from moving in the axial direction of the electrode assembly (10), thereby improving the assembly stability of the secondary battery. The insulating plate (70) can be made of an insulating polymer resin. In one example, the insulating plate (70) can include one or more materials selected from the group consisting of polyethylene, polypropylene, polyimide, and polybutylene terephthalate.

[0080] Meanwhile, the battery can (20) according to the present embodiment may include a crimping part (20C) and a beading part (20B). The crimping part (20C) is a part of the battery can (20) that surrounds the cap assembly (30) and the gasket (50). Specifically, the battery can (20) and the cap assembly (30) may be crimped with the gasket (50) interposed therebetween. That is, the crimping may be applied to the connection between the battery can (20) and the cap assembly (30). Accordingly, the crimping part (20C) may be formed in the battery can (20). More specifically, the crimping is performed by positioning the gasket (50) between the battery can (20) and the cap assembly (30), and then bending the upper end of the battery can (20) in the direction in which the cap assembly (30) is positioned.

[0081] The beading portion (20B) refers to a portion of the battery can (20) that is recessed toward the center in a region above the electrode assembly (10) among the side portions of the battery can (20), and is for the stable placement of the cap assembly (30) and the prevention of movement of the electrode assembly (10). That is, the cap assembly (30) according to the present embodiment and the gasket (50) surrounding it can be seated on the beading portion (20B) of the battery can (20). The above-described crimping connection can be performed in a state where the cap assembly (30) and the gasket (50) surrounding it are seated on the beading portion (20B).

[0082] The gasket (50) according to the present embodiment is positioned between the battery can (20) and the cap assembly (30), and can enhance the sealing property of the secondary battery. In addition, the gasket (50) may include an electrically insulating material, and may prevent a short circuit from occurring between the battery can (20), which functions as a second electrode terminal (112), and the cap assembly (30), which functions as a first electrode terminal (111). The gasket (50) may include one or more materials selected from the group consisting of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and perfluoroalkoxy alkane (PFA).

[0083] The vent portion (110V) according to the present embodiment can be formed on the lower surface of the battery cell (110). That is, it can be formed on the bottom portion (20F, see FIG. 9) of the battery can (20).

[0084] When a thermal event or thermal runaway phenomenon occurs inside a battery cell (110), high-temperature venting gas or particles may be generated. The vent part (110V) is a general term for a member or mechanism that can discharge such high-temperature venting gas or particles. For example, a notch part (110N) that is relatively thinner than the adjacent area may be formed at the bottom of the battery can among the lower surfaces of the battery cell (110). The notch part (110N) may have a constant circumference. When the internal pressure of the battery cell (110) increases due to high-temperature venting gas generated inside the battery cell (110), the notch part (110N) that is weak in rigidity due to its thin thickness may be ruptured first. The vent part (110V) is opened due to the rupture of the notch part (110N), and high-temperature venting gas or particles can be discharged through the opened vent part (110V).

[0085] However, the structure of this vent part (110V) is an example, and there is no special limitation on the shape of the vent part (110V) as long as it is a member or device that can discharge internal venting gas in the event of a thermal event or thermal runaway.

[0086] Meanwhile, although not specifically illustrated, the battery cell according to the present invention may be a square battery cell in which the electrode assembly is housed in a square can. That is, although the battery cell according to the present embodiment is depicted in the drawing as being a cylindrical battery cell, this is only one example of the structure of the battery cell of the present invention, and the battery cell according to another embodiment of the present invention may be a square battery cell.

[0087] Meanwhile, referring again to FIGS. 1 to 3, as described above, the pack frame (200) according to the present embodiment includes a bottom frame (210) and a side frame (220) that form a storage space in which battery cells (110) are stored. Battery cells (110) may be placed on the bottom frame (210), and a side frame (220) may be connected along an edge of the bottom frame (210). For example, the side frame (220) may include a first side frame (221), a second side frame (222), a third side frame (223), and a fourth side frame (224). The first side frame (221), the second side frame (222), the third side frame (223), and the fourth side frame (224) may be arranged along four sides of an edge of the bottom frame (210) having a rectangular shape. A storage space with an open upper portion is provided by the bottom frame (210) and the side frame (220), and battery cells (110) can be arranged in this storage space. After the battery cells (110) are arranged in the storage space, the open upper portion of the storage space can be covered by the pack upper cover (610). The pack upper cover (610) can be joined to the side frame (220) of the pack frame (200), and for example, welding or adhesive joining can be applied. The battery cells (110) can be sealed by the pack frame (200) and the pack upper cover (610). In addition, although not specifically illustrated, a gasket may be interposed between the pack upper cover (610) and the side frame (220) to enhance sealing properties.

[0088] Meanwhile, the battery pack (100) according to the present embodiment may include a mounting portion (220M1) and a mounting beam (220M2) provided on a side frame (220) for fixing the battery pack (100). For example, the mounting portions (220M1) are formed on the first side frame (221) and the second side frame (222), and the mounting beams (220M2) are formed on the third side frame (223) and the fourth side frame (224), as illustrated in FIGS. 1 and 2. The mounting portion (220M1) and the mounting beam (220M2) may be utilized when mounting the battery pack (100) to a device. For example, when mounting a battery pack (100) to a vehicle device, a mounting portion (220M1) and a mounting beam (220M2) can be fixed to the chassis of the vehicle.

[0089]

[0090] Below, the battery pack structure for preventing coolant leakage in the immersion cooling method according to the present embodiment will be described in detail.

[0091] Fig. 10 is a cross-sectional perspective view of a battery pack according to an embodiment of the present invention. Fig. 11 is a partial cross-sectional view showing an enlarged portion “B” of Fig. 10. Fig. 12 is a partial cross-sectional view showing an enlarged portion “C” of Fig. 11. Fig. 13 is a partial cross-sectional view showing an enlarged portion “D” of Fig. 11. Fig. 14 is a perspective view showing battery cells and a spacer according to an embodiment of the present invention. Fig. 15 is a partial perspective view showing an enlarged portion of a spacer according to an embodiment of the present invention.

[0092] Referring to FIGS. 2 to 6 and 10 to 15 together, as described above, the battery pack (100) according to the present embodiment includes a spacer (300) positioned on the upper portion of the bottom frame (210) and in which battery cells (110) are mounted; a holding frame (400) positioned on the upper portion of the spacer (300) and having holes (400H) formed in which the battery cells (110) are fitted; and a coolant (CL) flowing in the space between the spacer (300) and the holding frame (400) to directly cool the battery cells (110) within the pack frame (200). As illustrated in FIG. 11, the coolant (CL) flowing in the space between the spacer (300) and the holding frame (400) can directly cool the battery cells (110) by contacting the battery cells (110).

[0093] An inlet port (910) and an outlet port (920) may be formed in the side frame (220). As an example, the inlet port (910) and the outlet port (920) formed in the first side frame (221) are illustrated in FIGS. 2 and 3. The coolant (CL) introduced through the inlet port (910) may flow along the space between the spacer (300) and the holding frame (400) to cool the battery cells (110) and then be discharged through the outlet port (920). The inlet port (910) and the outlet port (920) are connected to a coolant circulation system (not shown) outside the battery pack (100), so that the coolant (CL) can be continuously circulated.

[0094] The holding frame (400) may be positioned between the spacer (300) and the pack upper cover (610). A hole (400H) is formed in the holding frame (400) so that the battery cells (110) can be inserted into the hole (400H). To this end, the hole (400H) of the holding frame (400) may have a shape corresponding to the outer shape of the battery cell (110). When the battery cell (110) is a cylindrical battery, the hole (400H) of the holding frame (400) may be circular, and when the battery cell (110) is a square battery, the hole (400H) of the holding frame (400) may be square.

[0095] In addition, the holding frame (400) may include protrusions (400P). As illustrated in FIG. 11, the protrusions (400P) of the holding frame (400) may be hooked to the side frame (220) or the vertical beam (700) described later. Due to the hooked connection of the protrusions (400P), the holding frame (400) may be mounted to the side frame (220) or the vertical beam (700) while being spaced apart from the spacer (300) by a certain distance. As the holding frame (400) is spaced apart from the spacer (300) by a certain distance, a space for the refrigerant (CL) to flow may be secured.

[0096] The spacer (300) may be placed on the bottom frame (210). The spacer (300) may be formed with a mounting portion (310) on which the battery cells (110) may be mounted. The battery cells (110) may not be positioned directly on the bottom frame (210), but may be placed on the bottom frame (210) with the battery cells (110) mounted on the mounting portions (310) of the spacer (300). To this end, the mounting portion (310) of the spacer (300) may have a shape corresponding to the outer shape of the battery cell (110). When the battery cell (110) is a cylindrical battery, the mounting portion (310) of the spacer (300) may be circular, and when the battery cell (110) is a square battery, the mounting portion (310) of the spacer (300) may be square. Since the battery cells (110) are positioned in the mounting portion (310) of the spacer (300), the battery cells (110) can be stably placed and fixed in the space inside the pack frame (200).

[0097] As described above, the spacer (300) and the holding frame (400) define a space in which the refrigerant (CL) flows and can prevent the refrigerant (CL) from leaking into other spaces. The spacer (300) corresponds to the lower limit of the refrigerant flow, and the holding frame (400) corresponds to the upper limit of the refrigerant flow. In this way, by preventing refrigerant leakage, the safety of the battery pack (100) can be enhanced along with its cooling performance.

[0098] Specifically, in an area above the holding frame (400), a bus bar (130) that guides the electrical connection of the battery cells (110) can be connected to the electrode terminals (111, 112) of the battery cells (110). As described above, the cap assembly (30) and the battery can (20) of the battery cell (110) can function as the first electrode terminal (111) and the second electrode terminal (112) of the battery cell (110). By connecting the bus bar (130) to the first electrode terminal (111) or the second electrode terminal (112), an HV connection, which is an electrical connection of the battery cells (110), can be formed. The HV connection is a connection that serves as a power source to supply power requiring high voltage, and refers to an electrical connection between battery cells or an electrical connection between a battery pack and a device. That is, in an area above the holding frame (400), the electrical connection of the battery cells (110) can be formed. In other words, the space through which the coolant (CL) flows and the space of the HV connection through which the electrical connection of the battery cells (110) is made can be separated from each other by the holding frame (400). As will be described later, the coolant (CL) may be an insulating oil or a coolant. If the coolant (CL), which is a coolant, comes into contact with the HV connection, a short circuit may occur, which may cause a serious safety problem. In addition, even if the coolant (CL) is an insulating oil, if the coolant (CL) comes into contact with the part through which the electrical connection of the battery cells (110) is made, it may have a negative effect on the electrical connection of the battery cells (110). Therefore, in the present embodiment, by separating the space through which the coolant (CL) flows by the holding frame (400) and the space through which the electrical connection of the battery cells (110) is made, the effect of increasing the cooling performance through direct cooling of the coolant (CL) can be maintained, while minimizing the effect of the coolant (CL) on the electrical connection of the battery cells (110).

[0099] In the battery pack (100) according to the present embodiment, a first waterproof adhesive (500a) may be applied to the upper portion of the holding frame (400). Due to the first waterproof adhesive (500a) applied to the upper portion of the holding frame (400), the coolant (CL) may be prevented from leaking beyond the holding frame (400) to the upper portion of the holding frame (400). In a state where the battery cell (110) is mounted in the hole (400H) of the holding frame (400), the first waterproof adhesive (500a) may be applied to the upper surface of the holding frame (400) and the upper portion of the battery cell (110).

[0100] As mentioned above, the battery pack (100) may include a pack upper cover (610) covering the open upper portion of the pack frame (200), and a first waterproof adhesive (500a) may be applied to a space between the holding frame (400) and the pack upper cover (610). In particular, at least a portion of the bus bar (130) may be surrounded by the first waterproof adhesive (500a). In addition, the space surrounding the bus bar (130) may be filled with the first waterproof adhesive (500a). Furthermore, the space between the holding frame (400) and the pack upper cover (610) may be filled with the first waterproof adhesive (500a). Due to the holding frame (400) and the first waterproof adhesive (500a), the refrigerant (CL) may be prevented from leaking into the upper region of the holding frame (400).

[0101] Fig. 16 is a cross-sectional perspective view of a pack frame according to one embodiment of the present invention. Fig. 17 is a partial cross-sectional view showing an enlarged portion “E” of Fig. 16. Fig. 18 is a partial cross-sectional view showing an enlarged portion “F” of Fig. 17.

[0102] Referring to FIGS. 11, 12, and 14 to 18 together, in the battery pack (100) according to the present embodiment, a second waterproof adhesive (500b) may be applied to a surface of the spacer (300) that faces the battery cells (110). Specifically, the second waterproof adhesive (500b) may be applied on the mounting portion (310) of the spacer (300). Due to the spacer (300) and the second waterproof adhesive (500b), the coolant (CL) may be prevented from leaking beyond the spacer (300) to the lower region of the spacer (300).

[0103] The first waterproof adhesive (500a) and the second waterproof adhesive (500b) according to the present embodiment have no particular limitations on their materials, as long as they exhibit waterproof performance and have impact resistance, adhesiveness, and electrical insulation properties. For example, the first waterproof adhesive (500a) and the second waterproof adhesive (500b) may include a two-component epoxy-based material in which a curing agent is mixed into the main body.

[0104] Meanwhile, the coolant (CL) according to the present embodiment may be a fluid. Since the coolant (CL) directly contacts the battery cells (110) within the battery pack (100), the coolant (CL) may be electrically insulating. The coolant (CL) may be a material having insulating properties. For example, the coolant (CL) may be insulating oil. However, in the case of the battery pack (100) according to the present embodiment, since the coolant (CL) is prevented from leaking into areas other than the space between the spacer (300) and the holding frame (400), a general coolant may also be applied as the coolant (CL).

[0105] FIG. 19 is a partial cross-sectional view of a battery pack according to another embodiment of the present invention.

[0106] Referring to Fig. 19, as described above, a first waterproof adhesive (500a) may be applied to the space between the holding frame (400) and the pack upper cover (610). In a battery pack (100) according to another embodiment of the present invention, a foam member (611) may be provided on the lower surface of the pack upper cover (610). The foam member (611) may be a member in the form of a foam and may be attached to the lower surface of the pack upper cover (610). The space between the holding frame (400) and the foam member (611) may be filled with the first waterproof adhesive (500a).

[0107] In the vent part (110V) of the battery cell (110), high-temperature venting gas or particles inside the battery cell (110) may be discharged, and such high-temperature venting gas or particles may be discharged to the outside of the battery pack (100) through the venting channel (VC) of the bottom frame (210) described later. At this time, in order to prevent the venting gas or particles from being discharged in the direction of the pack top cover (610) rather than in the direction in which the venting channel (VC) of the bottom frame (210) is located, a foam member (611) may be attached to the lower surface of the pack top cover (610). That is, the foam member (611) may be a type of member for top potting.

[0108]

[0109] Fig. 20 is a perspective view showing a pack frame according to one embodiment of the present invention, with the first side frame excluded. Fig. 21 is an exploded perspective view of a bottom frame according to one embodiment of the present invention.

[0110] Referring to FIGS. 20 and 21 together with FIGS. 3, 5, 6, 12, 16, 17, and 18, as described above, the pack frame (200) includes a bottom frame (210) and a side frame (220). A venting channel (VC) may be formed in the bottom frame (210) according to an embodiment of the present invention. Specifically, the bottom frame (210) may include a first frame (211) and a second frame (212) positioned below the first frame (211), and the venting channel (VC) may be formed between the first frame (211) and the second frame (212). The detailed structures of the bottom frame (210) and the venting channel (VC) will be described later.

[0111] In the battery pack (100) according to the present embodiment, a vertical beam (700) that divides the battery cells (110) into a plurality of battery cell groups (110G) may be positioned on the bottom frame (210). The vertical beam (700) may be positioned upright on the bottom frame (210) such that one side of the vertical beam (700) is perpendicular to one side of the bottom frame (210). For example, FIGS. 2 to 6 illustrate three vertical beams (700) positioned at a predetermined interval on the bottom frame (210). Accordingly, the battery cells (110) may be divided into four battery cell groups (110G).

[0112] Meanwhile, the battery pack (100) according to the present embodiment may include a separation frame (800) positioned adjacent to the side frame (220). For example, the separation frame (800) may be positioned adjacent to the second side frame (222). The separation frame (800) may be positioned between the second side frame (222) and the battery cells (110), and may be placed on the bottom frame (210). A venting space (VS), which is a space where venting gas discharged from the battery cells (110) is discharged, may be formed between the separation frame (800) and the second side frame (222). The separation frame (800) and the venting space (VS) will be described later.

[0113] The side frame (220), the vertical beam (700), and the separation frame (800) according to the present embodiment may be metal frames having an empty space inside. Specifically, the side frame (220), the vertical beam (700), and the separation frame (800) may be metal frames in the form of a square pipe having a cavity. Accordingly, the weight of the battery pack (100) can be reduced, and at the same time, the rigidity of the battery pack (100) can be secured. In addition, since the bottom frame (210), the side frame (220), the vertical beam (700), and the separation frame (800) include a metal material, welding can be used for the connection between the respective frames. There is no particular limitation on the method of welding, but, for example, MIG welding (Metal Inert Gas Welding) or FSW (Friction Stir Welding) can be applied.

[0114] Meanwhile, the battery pack (100) according to the present embodiment may further include a pack lower cover (620) that covers the lower portion of the bottom frame (210). The pack lower cover (620) may be a plate-shaped member including a metal material.

[0115] Below, the joint line between the pack lower cover (620) and the bottom frame (210) will be described.

[0116] Fig. 22 is a plan view showing battery cells and welding lines around them according to one embodiment of the present invention. Fig. 23 is a plan view showing battery cells and a pack lower cover according to one embodiment of the present invention.

[0117] Referring to FIGS. 11, 17, 20 to 23 together, when viewed in the height direction, a joining line (BL) between the pack lower cover (620) and the bottom frame (210) may be formed along the outer perimeter of the area where the battery cells (110) are located. Here, viewing in the height direction means viewing in a direction perpendicular to one surface of the bottom frame (210) on one surface of the bottom frame (210). More specifically, viewing in the height direction may correspond to viewing along the -z-axis direction on the xy plane, as in FIGS. 22 and 23.

[0118] The joint line (BL) between the pack lower cover (620) and the bottom frame (210) may be a portion where welding is performed. In particular, the portion where the pack lower cover (620) and the bottom frame (210) are welded may be a portion where the side frame (220), the vertical beam (700), and the separation frame (800) are placed. In other words, the side frame (220), the bottom frame (210), and the pack lower cover (620) may be joined together by welding. In addition, the vertical beam (700), the bottom frame (210), and the pack lower cover (620) may be joined together by welding. In addition, the separation frame (800), the bottom frame (210), and the pack lower cover (620) may be joined together by welding. In FIG. 22, the bonding line (BL) surrounding the outer perimeter of the battery cells (110) may be a portion where the side frame (220), the bottom frame (210), and the pack lower cover (620) are bonded together. In addition, the bonding line (BL) located between the battery cell groups (110G) in FIG. 22 may be a portion where the vertical beam (700), the bottom frame (210), and the pack lower cover (620) are bonded together. In addition, the bonding line (BL) located directly above each battery cell group (110G) in FIG. 22 may be a portion where the separation frame (800), the bottom frame (210), and the pack lower cover (620) are bonded together.

[0119] Meanwhile, the pack lower cover (620) according to the present embodiment may include an upwardly recessed portion (620D). This recessed portion (620D) may be a portion recessed upwardly to be joined to the vertical beam (700). When the recessed portion (620D) of the pack lower cover (620) is joined to the bottom frame (210) and the vertical beam (700), a joining line (BL) may be formed at the corresponding portion.

[0120] The joint line (BL) between the pack lower cover (620) and the bottom frame (210) formed along the outer perimeter of the area where the battery cells (110) are located, as mentioned above, may be a portion where the side frames (220) are joined together. This joint line (BL) may not only fix the side frame (220), the bottom frame (210), and the pack lower cover (620), but may also perform a leak prevention function to prevent the coolant (CL) from leaking to the outside of the battery pack (100). Specifically, with respect to the lower direction of the battery cells (110), the spacer (300) and the second waterproof adhesive (500b) described above may be responsible for the primary coolant leak prevention function. The joint line (BL) formed along the outer perimeter of the area where the battery cells (110) are located may be responsible for the secondary coolant leak prevention function with respect to the lower direction of the battery cells (110). That is, even if there is a coolant (CL) leaking through the spacer (300) and the second waterproof adhesive (500b), the coolant (CL) is sealed by the bonding line (BL) and does not leak to the outside. Similarly, the bonding line (BL) located between the battery cell groups (110G) or the bonding line (BL) located directly above the battery cell groups (110G) can also perform the function of preventing the coolant (CL) from leaking to the outside.

[0121] Meanwhile, the welding joint between the pack lower cover (620) and the bottom frame (210) can only be performed in one direction on one side of the pack lower cover (620). This is because there is a side frame (220), a vertical beam (700), or a separation frame (800) on the opposite side. In this way, when welding is performed in one direction only on one side of the pack lower cover (620), it is preferable to apply the FSW (Friction Stir Welding) method.

[0122]

[0123] Below, the directional venting structure of the battery pack (100) according to the present embodiment will be described.

[0124] Referring again to FIGS. 8, 12, 14, 15, and 18, the vent portion (110V) of the battery cell (110) according to the present embodiment may face the spacer (300). More specifically, the vent portion (110V) of the battery cell (110) may face the mounting portion (310) of the spacer (300). The spacer (300) according to the present embodiment may include a spacer venting portion (320a) which is a portion facing the vent portion (110V); and an outer circumference (320b) surrounding the spacer venting portion (320a). The spacer venting portion (320a) may have a thinner thickness than the outer circumference (320b) or may have a notched groove. Due to a thermal event or thermal runaway of the battery cell (110), high-temperature venting gas and particles are discharged from the vent portion (110V) of the battery cell (110), and due to the pressure of the venting gas, the spacer venting portion (320a) may be separated from the outer peripheral portion (320b) and the spacer venting portion (320a) may be opened. That is, the high-temperature venting gas and particles may be discharged downward through the vent portion (110V) and the opened spacer venting portion (320a). Thereafter, the high-temperature venting gas and particles may move along a preset path through the venting channel (VC) provided in the bottom frame (210). Hereinafter, the specific structures of the bottom frame (210) and the venting channel (VC) will be described.

[0125] Fig. 24 is a partial perspective view showing a portion of a bottom frame according to an embodiment of the present invention. Fig. 25 is a partial perspective view showing the bottom frame of Fig. 24 with the first frame removed. Fig. 26 is a partial perspective view showing the bottom frame of Fig. 25 with the separation frame removed. Fig. 27 is a plan view showing a portion of a bottom frame according to an embodiment of the present invention. Fig. 28 is a plan view showing the bottom frame of Fig. 27 with the first frame removed.

[0126] Referring to FIGS. 24 to 28 together with FIGS. 11, 12, 17, 18, and 21, a venting channel (VC) that guides high-temperature venting gas or particles discharged from a vent portion (110V) of a battery cell (110) may be formed in a bottom frame (210) according to an embodiment of the present invention. Specifically, the bottom frame (210) may include a first frame (211) and a second frame (212) positioned below the first frame (211), and a venting channel (VC) may be formed between the first frame (211) and the second frame (212).

[0127] In the first frame (211), through holes (211H) may be formed. When viewed in the height direction, the through holes (211H) may be positioned so as to overlap at least a portion with the vent portion (110V) of the battery cell (110). The through holes (211H) may be arranged to correspond one-to-one with the vent portion (110V). Similarly, the through holes (211H) may be arranged to correspond one-to-one with the spacer venting portions (320a).

[0128] High-temperature venting gas and particles that pass through the vent part (110V) and the open spacer venting part (320a) can flow into the venting channel (VC) inside the bottom frame (210) through the through hole (211H). The high-temperature venting gas and particles that flow into the venting channel (VC) are discharged to the outside of the battery pack (100). The battery pack (100) according to the present embodiment has a so-called “bottom venting” structure that discharges high-temperature venting gas and particles, etc. to the outside using the bottom frame (210). The HV connection described above is a connection that serves as a power source to supply power that requires high voltage, and refers to a connection between battery cells, etc. If high-temperature venting gas or particles, etc., due to a thermal event of the battery cell (110) come into contact with a high-voltage path such as an HV connection, a short circuit or arc discharge, etc., may occur, which may lead to additional explosion and flame generation. On the other hand, in the case of the battery pack (100) according to the present embodiment, as mentioned above, since it has a “bottom venting” structure, high-temperature venting gas or particles caused by a thermal event are discharged downward, i.e., toward the bottom frame (210). Therefore, there is no risk of high-temperature venting gas or particles, etc., reaching a high-voltage path such as an HV connection, and ultimately, safety against thermal runaway can be enhanced.

[0129] Moreover, in the case of the present embodiment, since the holding frame (400) additionally covers the area where the electrode terminals (111, 112) of the battery cells (110) and the bus bar (130) are located, it is possible to completely block high-temperature venting gas or particles from reaching the area where the electrode terminals (111, 112) of the battery cells (110) and the bus bar (130) are located.

[0130] In addition, since the battery pack (100) according to the present embodiment has a “lower venting” structure, the influence of high-temperature venting gas or particles on the coolant (CL) flowing in the space between the spacer (300) and the holding frame (400) can be minimized.

[0131] In addition, the spacer (300) and the second waterproof adhesive (500b) can prevent the refrigerant (CL) from leaking into the lower area of ​​the spacer (300), as well as prevent high-temperature venting gas or particles from leaking out in the upper direction rather than the lower direction where the bottom frame (210) is located.

[0132] Meanwhile, as described above, the vertical beam (700) can divide the battery cells (110) into a plurality of battery cell groups (110G). A venting channel (VC) corresponding to one battery cell group (110G) can have an independent venting path that is not shared with the venting channel (VC) corresponding to another battery cell group (110G). For example, as illustrated in FIGS. 14 and 21, four second frames (212) corresponding to each of the four battery cell groups (110G) can be provided. A venting channel (VC) in one second frame (212) can have an independent venting path that is not communicated with the venting channel (VC) in another second frame (212).

[0133] Additionally, the second frame (212) may have at least one bulkhead (212W), and the bulkhead (212W) may divide the second frame (212) into a plurality of venting channels (VC).

[0134] In this way, some venting channels (VC) do not share each other's space and may have independent venting paths. Therefore, high-temperature venting gas and particles passing through one venting channel (VC) do not propagate to other venting channels (VC). Accordingly, the propagation of a thermal event occurring in a specific battery cell (110) to other battery cells (110) can be minimized. Accordingly, high-temperature venting gas or particles do not flow back into other battery cells (110) that are connected to other venting channels (VC), and ultimately, thermal events are not propagated or triggered to other battery cells (110). In the present embodiment, by implementing independent venting paths between venting channels (VC), thermal runaway transfer between battery cells (110) is minimized and explosion and structural collapse of the battery pack can be prevented.

[0135] Meanwhile, the venting channel (VC) according to the present embodiment may be connected to a venting device (220D) provided in the side frame (220). High-temperature venting gas and particles flowing along the venting channel (VC) may be discharged to the outside of the battery pack (100) through the venting device (220D). There is no particular limitation on the specific form of the venting device (220D), and the venting device (220D) may be a valve structure that opens or ruptures when the internal pressure is above a certain level. Fig. 26 illustrates four venting devices (220D) formed in the second side frame (222).

[0136] Below, an example structure of a venting path from a venting channel (VC) to a venting device (220D) is described.

[0137] As described above, the battery pack (100) according to the present embodiment may include a separation frame (800) positioned adjacent to the side frame (220). The separation frame (800) may be positioned upright on the bottom frame (210) such that one side of the separation frame (800) is perpendicular to one side of the bottom frame (210). One side of the separation frame (800) may be perpendicular to one side of the vertical beam (700). The separation frame (800) may be positioned between the second side frame (222) and the battery cells (110), and a venting space (VS) may be formed between the separation frame (800) and the second side frame (222). This venting space (VS) may be communicated with a venting device (220D).

[0138] As illustrated in FIGS. 21 and 27, the first frame (211) of the bottom frame (210) may be formed with not only a through hole (211H) but also an opening (211P). This opening (211P) may be in communication with the venting space (VS). When viewed in the height direction, the through hole (211H) and the opening (211P) may be positioned on opposite sides with respect to the separation frame (800). In other words, the area where the through hole (211H) is formed and the area where the opening (211P) is formed may be separated from each other by the separation frame (800).

[0139] Referring to FIGS. 24 and 25, high-temperature venting gas or particles discharged from the vent portion of the battery cell can flow into a venting channel (VC) provided between the first frame (211) and the second frame (212) through the through hole (211H) of the first frame (211). The introduced high-temperature venting gas or particles flow along the direction in which the venting channel (VC) extends.

[0140] Referring to FIGS. 25 to 28, high-temperature venting gas or particles flowing along the venting channel (VC) may flow into the venting space (VS) through the opening (211P) of the first frame (211). Even within this venting space (VS), the space may be divided by battery cell group (110G) and may not be shared with each other. Finally, the high-temperature venting gas or particles flowing into the venting space (VS) may be discharged to the outside of the battery pack (100) through the venting device (220D).

[0141] In the present embodiment, a long venting path is provided along a venting channel (VC), and a venting space (VS) may be provided separately in addition to the venting channel (VC). High-temperature venting gas and particles move along the long venting path, and the venting path is bent by the venting space (VS). While the venting gas flows along the venting channel (VC) and the venting space (VS), the temperature of the venting gas or particles may be lowered. Therefore, the venting gas or particles may be prevented from triggering an explosion. In addition, as the venting path is lengthened, oxygen introduced from the outside of the battery pack (100) is blocked from coming into contact with the venting gas, thereby preventing an explosion. In addition, large particles may be filtered out in the venting path.

[0142] In this example, terms indicating directions such as front, back, left, right, up, and down are used, but these terms are only for convenience of explanation and may vary depending on the location of the target object or the location of the observer.

[0143] The battery pack according to the embodiment described above can be applied to various devices. Specifically, it can be applied to transportation vehicles such as electric bicycles, electric vehicles, and hybrid vehicles, as well as ESS (Energy Storage Systems), but is not limited thereto. It can also be applied to various devices capable of using secondary batteries.

[0144] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0145] Description of the symbol

[0146] 100: Battery pack

[0147] 110: Battery cell

[0148] 110V: Vent

[0149] 200: Pack Frame

[0150] 210: Bottom Frame

[0151] 220: Side Frame

[0152] 300: Spacer

[0153] 400: Holding Frame

[0154] 500a: 1st waterproofing adhesive

[0155] 500b: Second waterproof adhesive

[0156] 610: Pack top cover

[0157] 620: Pack bottom cover

Claims

1. Multiple battery cells; A pack frame including a bottom frame and a side frame forming a storage space in which the above battery cells are stored; A spacer positioned on the upper portion of the bottom frame and on which the battery cells are mounted; A holding frame positioned on the upper portion of the spacer and having holes formed into which the battery cells are inserted; and A battery pack comprising a coolant flowing in the space between the spacer and the holding frame to directly cool the battery cells within the pack frame.

2. In paragraph 1, A battery pack in which a first waterproof adhesive is applied to the upper part of the above holding frame.

3. In paragraph 1, A battery pack in which a bus bar guiding electrical connection of the battery cells is connected to the electrode terminals of the battery cells in an area above the holding frame.

4. In paragraph 3, A battery pack wherein at least a portion of the above bus bar is surrounded by a first waterproof adhesive.

5. In paragraph 1, Further comprising a pack upper cover covering the open upper portion of the pack frame; A battery pack in which a first waterproof adhesive is applied to the space between the holding frame and the pack upper cover.

6. In paragraph 5, A battery pack in which a foam member is provided on the lower surface of the upper cover of the pack.

7. In paragraph 1, A battery pack in which a second waterproof adhesive is applied to the surface of the spacer facing the battery cells.

8. In paragraph 1, Further comprising a pack lower cover covering the lower portion of the above bottom frame, A battery pack in which a joint line between the pack lower cover and the bottom frame is formed along the outer perimeter of the area in which the battery cells are located when viewed in the height direction.

9. In paragraph 1, The above battery cells are a battery pack having a vent section.

10. In paragraph 9, A battery pack in which the vent portion of the above battery cell faces the spacer.

11. In paragraph 10, The spacer includes a spacer venting portion facing the vent portion; and an outer peripheral portion surrounding the spacer venting portion; A battery pack in which the spacer venting portion has a thinner thickness than the outer peripheral portion or has a notching groove.

12. In paragraph 9, A battery pack in which a venting channel is formed in the bottom frame to guide venting gas or particles discharged from the vent section of the battery cell.

13. In paragraph 12, The bottom frame includes a first frame and a second frame positioned below the first frame, A battery pack in which the venting channel is formed between the first frame and the second frame.

14. In paragraph 13, A through hole is formed in the first frame, A battery pack in which, when viewed in the height direction, the through hole is positioned so as to overlap at least a portion of the vent portion of the battery cell.

15. In paragraph 12, A battery pack in which a vertical beam dividing the above battery cells into a plurality of battery cell groups is positioned above the bottom frame.

16. In paragraph 15, A battery pack in which the venting channel corresponding to one of the above battery cell groups has an independent venting path that is not shared with the venting channel corresponding to another of the above battery cell groups.

17. In paragraph 12, The above venting channel is a battery pack that is connected to a venting device provided in the side frame.

18. A device including a battery pack according to paragraph 1.

Images