Battery cell assembly and battery pack including same

Abstract

One embodiment of the present invention comprises: a battery cell stack in which a plurality of battery cells are stacked; a frame member for accommodating the battery cell stack; and an inlet and an outlet for circulating a refrigerant into the frame member, wherein the refrigerant is introduced into the frame member through the inlet and discharged through the outlet, a reinforcing plate is inserted into at least one of the upper part and the lower part of the frame member, and the reinforcing plate includes a reinforcing main body part located inside the frame member and at least one reinforcing protrusion part protruding from one surface of the reinforcing main body part toward one surface of the frame member.

Description

Battery cell assembly and battery pack including the same

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

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0024296, filed February 20, 2024, and Korean Patent Application No. 10-2025-0019170, filed February 14, 2025, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a battery cell assembly and a battery pack including the same, and more particularly, to a battery cell assembly having a structure for improving cooling efficiency and safety and suppressing an upper displacement of a frame member, and a battery pack 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 with medium- to large-sized module structures that assemble battery modules in which a number of secondary batteries are connected in series / parallel is increasing.

[0007] Meanwhile, when configuring a battery pack by connecting multiple battery cells in series / parallel, it is common to configure a battery module composed of at least one battery cell and configure a battery pack by adding other components using at least one battery module.

[0008] The battery cells that make up these medium- to large-sized battery modules are composed of rechargeable secondary batteries. Therefore, these high-output, 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, which can cause the temperature to rise rapidly and severely. In other words, battery modules with multiple battery cells stacked on top of each other and battery packs equipped with such battery modules can achieve high output, but it is difficult to remove the heat generated from the battery cells during charging and discharging. If the heat dissipation of the battery cells is not properly performed, the deterioration of the battery cells will be accelerated, shortening their lifespan and increasing the risk of explosion or fire.

[0009] Moreover, battery modules included in vehicle battery packs are frequently exposed to direct sunlight and may be subjected to high-temperature conditions, such as summer or desert environments. Furthermore, because multiple battery modules are densely packed together to increase vehicle range, flames or heat generated in one battery module can easily spread to neighboring modules, ultimately leading to ignition or explosion of the battery pack itself.

[0010] In addition, since the battery pack is composed of a structure in which multiple battery modules are combined, it is heavy and unsuitable for loading multiple batteries into a vehicle such as an automobile, so there is a need to improve the energy density.

[0011] Fig. 1 is a perspective view showing a conventional battery pack. Fig. 2 is an exploded perspective view of the battery pack of Fig. 1.

[0012] Referring to FIGS. 1 and 2, a conventional battery pack (10) includes a lower pack frame (11) on which a plurality of battery modules (1) are mounted, an upper pack frame (12) positioned above the battery modules (1), and an internal beam (13) that defines a location where the battery modules (1) are mounted within the battery pack (10).

[0013] In this way, when a battery module (1) is mounted inside a battery pack (10), the energy density of the battery pack (10) decreases due to the internal beam (13) that partitions between the battery modules (1), so there was a problem that a larger number of battery packs (10) had to be equipped to meet the efficiency required in a device, etc. In addition, there was a limit to the number of battery packs (10) that could be equipped in a device due to the weight of the battery pack (10). Therefore, in order to reduce the weight of the battery pack (10) and increase the energy density of the battery pack (10) at the same time, there was a need to mount a larger number of battery modules (1) inside the battery pack (10).

[0014] FIG. 3 is a cross-sectional view showing a cross-section of one of the battery modules included in the battery pack of FIG. 2.

[0015] Referring to FIG. 3, a conventional battery module (1) includes a battery cell stack (3) including battery cells (2) stacked in a preset direction, and a module frame (4) that accommodates the battery cell stack (3), and the battery cell stack (3) is fixedly positioned on a thermally conductive resin layer (5) positioned on the lower surface of the module frame (4). In this case, a heat sink (6) positioned below the bottom of the module frame (4) may be provided to cool the heat generated in the battery cell stack (3).

[0016] However, the heat sink (6) has a disadvantage in that its cooling efficiency is not very high because it does not directly contact the battery cell stack (3) and receives heat. In particular, an air gap may be formed between the bottom of the module frame (4) and the thermally conductive resin layer (5), which is a factor that hinders heat transfer. There is a need for a more effective method for cooling the battery module (1).

[0017] In summary, a more effective method is needed to improve the cooling efficiency of battery modules.

[0018] The problem to be solved by the present invention is to provide a battery cell assembly having a structure for improving cooling efficiency and thus enhancing cooling performance, and suppressing the upper displacement of a frame member, and a battery pack including the same.

[0019] The problems to be solved by the present invention are not limited to the problems described above, and problems not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention pertains from this specification and the attached drawings.

[0020] According to one embodiment of the present invention, a battery cell stack in which a plurality of battery cells are stacked; a frame member accommodating the battery cell stack; and an inlet and an outlet for circulating a coolant into the interior of the frame member, wherein the coolant flows into the interior of the frame member through the inlet and is discharged through the outlet, and a reinforcing plate is inserted into at least one of the upper part or the lower part of the frame member, and the reinforcing plate includes a reinforcing main body portion located inside the frame member and at least one reinforcing protrusion portion protruding from one surface of the reinforcing main body portion toward one surface of the frame member.

[0021] The inside of the above frame member and the outside of the above reinforcing plate may be in close contact with each other.

[0022] The above reinforcing plate is inserted into the upper portion of the frame member, and the reinforcing main body portion may extend along the upper surface of the frame member.

[0023] The above reinforcing plate includes reinforcing bent portions bent on each side of the reinforcing main body, and the reinforcing bent portions may extend along each side of the frame member.

[0024] Each of the at least one reinforcing protrusion may extend along the stacking direction of the battery cell stack.

[0025] The at least one reinforcing protrusion may be spaced apart from each other at equal intervals.

[0026] The at least one reinforcing protrusion may have a wider area as it approaches the center at the end of the battery cell assembly.

[0027] The at least one reinforcing protrusion may be spaced at a narrower interval as it approaches the center at the end of the battery cell assembly.

[0028] The above reinforcing plate may be made of a material having higher rigidity than the above frame member.

[0029] The above frame member may be made of a resin material, and the above reinforcing plate may be made of a steel material.

[0030] The battery cell stack may include a first battery cell stack and a second battery cell stack, an insulating plate may be disposed between the first battery cell stack and the second battery cell stack, and an opening through which the coolant passes may be formed in the insulating plate.

[0031] Based on the above insulating plate, the inlet and the outlet may be positioned on opposite sides, the first battery cell stack may be positioned between the inlet and the insulating plate, and the second battery cell stack may be positioned between the outlet and the insulating plate.

[0032] The refrigerant introduced through the inlet can sequentially pass through the first battery cell stack, the opening of the insulating plate, and the second battery cell stack, and be discharged through the outlet.

[0033] According to one embodiment of the present invention, a battery cell assembly further includes a first sealing assembly and a second sealing assembly that cover open sides of the frame member, respectively, wherein the inlet is formed in the first sealing assembly, the outlet is formed in the second sealing assembly, and the inlet may be positioned below a center portion based on a height of the first sealing assembly, and the outlet may be positioned above a center portion based on a height of the second sealing assembly.

[0034] The above battery cell includes electrode leads protruding in both directions, and when the direction between the electrode leads is referred to as the longitudinal direction, the first sealing assembly, the first battery cell stack, the insulating plate, the second battery cell stack, and the second sealing assembly may be sequentially positioned along the longitudinal direction.

[0035] The above refrigerant is an insulating oil, and the above refrigerant can come into direct contact with the battery cell stack housed inside the frame member.

[0036] A battery pack according to another embodiment of the present invention may include the battery cell assembly described above.

[0037] According to embodiments, the battery cell assembly of the present invention and the battery pack including the same can increase the cooling efficiency of the battery cell assembly and the battery pack including the same through direct cooling of the coolant to the battery cells.

[0038] In addition, energy density can be increased by arranging multiple battery cell stacks along the length direction within the battery cell assembly, and the fluidity of the coolant can be improved by arranging an insulating plate having openings formed between the multiple battery cell stacks.

[0039] In addition, a reinforcing plate may be inserted into the upper portion of the frame member, so as to have a structure for suppressing the upper displacement of the frame member.

[0040] The effects of the present invention are not limited to the effects described above, and effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention pertains from this specification and the attached drawings.

[0041] Figure 1 is a perspective view showing a conventional battery pack.

[0042] Figure 2 is an exploded perspective view of the battery pack of Figure 1.

[0043] FIG. 3 is a cross-sectional view showing a cross-section of one of the battery modules included in the battery pack of FIG. 2.

[0044] Figure 4 is a perspective view of a battery cell assembly according to one embodiment of the present invention.

[0045] Figure 5 is an exploded perspective view of the battery cell assembly of Figure 4.

[0046] FIG. 6 is a perspective view showing a frame member included in the battery cell assembly of FIG. 5.

[0047] Fig. 7 is a perspective view showing a reinforcing plate inserted into the upper part of the frame member of Fig. 6.

[0048] Fig. 8 is a cross-sectional view showing a cross-section taken along the a-a' axis of Fig. 6.

[0049] FIG. 9 is a perspective view showing a battery cell stack, a first busbar assembly, and a second busbar assembly included in the battery cell assembly of FIG. 5.

[0050] FIG. 10 is a plan view showing one of the battery cells included in the battery cell stack of FIG. 9.

[0051] FIG. 11 is a perspective view showing a first battery cell stack and a first bus bar assembly included in the battery cell assembly of FIG. 5.

[0052] Figure 12 is an exploded perspective view of the first battery cell stack and the first bus bar assembly of Figure 11.

[0053] Fig. 13 is a perspective view showing a battery cell stack of Fig. 9, with side plates further arranged on the first busbar assembly and the second busbar assembly.

[0054] Fig. 14 is an exploded perspective view showing the first battery cell stack and the second battery cell stack included in the battery cell stack of Fig. 13 separately.

[0055] FIG. 15 and FIG. 16 are perspective views showing a battery cell assembly according to another embodiment of the present invention.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] Hereinafter, a battery cell assembly (100) according to one embodiment of the present invention will be described.

[0062] Fig. 4 is a perspective view of a battery cell assembly according to one embodiment of the present invention. Fig. 5 is an exploded perspective view of the battery cell assembly of Fig. 4. Fig. 6 is a perspective view showing a frame member included in the battery cell assembly of Fig. 5.

[0063] Referring to FIGS. 4 and 5, a battery cell assembly (100) according to one embodiment of the present invention includes a battery cell stack (120) including a first battery cell stack (120a) and a second battery cell stack (120b); a frame member (200) that accommodates the battery cell stack (120); and an inlet (421) and an outlet (461) for circulating a coolant into the interior of the frame member (200). The first battery cell stack (120a) and the second battery cell stack (120b) are formed by stacking a plurality of battery cells (110). The coolant, inlet (421), and outlet (461) will be described later.

[0064] Referring to FIGS. 4 to 6, the frame member (200) may be used to protect the battery cell stack (120) and electrical components connected thereto from external physical impact. The battery cell stack (120) and electrical components connected thereto may be accommodated in the internal space of the frame member (200).

[0065] The structure of the frame member (200) may vary. According to one embodiment of the present invention, the structure of the frame member (200) may be a monoframe structure. Here, the monoframe may have an integrated upper surface, lower surface, and both sides. For example, the monoframe may be manufactured by injection molding.

[0066] The frame member (200) may be open on both sides. More specifically, the frame member (200) may be provided in an open form along the longitudinal direction of the battery cell (110). In this case, the front and rear sides of the battery cell stack (120) may not be covered by the frame member (200). The front and rear sides of the battery cell stack (120) may be covered by the first and second bus bar assemblies (300a, 300b), the sealing assembly (400), or the end plate (500) described below, through which the front and rear sides of the battery cell stack (120) may be protected from external physical impacts, etc.

[0067] Fig. 7 is a perspective view showing a reinforcing plate inserted into the upper part of the frame member of Fig. 6. Fig. 8 is a cross-sectional view showing a cross-section taken along the a-a' axis of Fig. 6.

[0068] Referring to FIGS. 6 to 8, the battery cell assembly (100) according to the present embodiment may have a reinforcing plate (201) inserted into at least one of the upper or lower portion of the frame member (200). More specifically, the interior of the frame member (200) and the outer surface of the reinforcing plate (201) may be in close contact with each other. In other words, the reinforcing plate (201) may be embedded in at least one of the upper or lower portion of the frame member (200), and the frame member (200) and the reinforcing plate (201) may be formed by a two-piece injection molding method. For example, as shown in FIGS. 6 to 8, the reinforcing plate (201) may be inserted into the upper portion of the frame member (200).

[0069] The reinforcing plate (201) may be made of a material having higher rigidity than the frame member (200). For example, the frame member (200) may be made of a resin material, and the reinforcing plate (201) may be made of a steel material. However, the materials of the frame member (200) and the reinforcing plate (201) are not limited thereto, and any material that has a difference in rigidity and can be manufactured by injection molding may be included in the present embodiment.

[0070] Accordingly, in the battery cell assembly (100) according to the present embodiment, the reinforcing plate (201) can supplement the rigidity of the frame member (200), thereby suppressing displacement due to internal hydraulic pressure generated by insulating oil circulating inside the frame member (200).

[0071] In addition, when the reinforcing plate (201) is positioned on the upper part of the frame member (200), the rigidity of the upper part of the frame member (200) can be supplemented, so that the displacement applied in the direction toward the upper part of the frame member (200) by the internal hydraulic pressure generated by the insulating oil circulating inside the frame member (200) can be effectively suppressed.

[0072] In particular, since the battery cell assembly (100) according to the present embodiment has a structure in which a plurality of battery cell stacks (120a, 120b) are arranged along the longitudinal direction of the battery cell assembly (100), as the length of the battery cell assembly (100) becomes relatively longer, the displacement amount of the battery cell assembly (100) may also relatively increase.

[0073] However, since the side of the battery cell assembly (100) has a mounting structure formed thereon, an increase in displacement at the side of the battery cell assembly (100) can be suppressed. In addition, the lower part of the battery cell assembly (100) comes into contact with the lower surface of the battery pack or device on which the battery cell assembly (100) is mounted, so that an increase in displacement at the lower part of the battery cell assembly (100) can be suppressed. In contrast, there is a problem in that there is no separate space at the upper part of the battery cell assembly (100) in which to place a separate component that can suppress the displacement at the upper part of the battery cell assembly (100).

[0074] At this time, the battery cell assembly (100) of the present embodiment has a structure in which a reinforcing plate (201) is inserted into the upper portion of the frame member (200), and thus, without requiring additional space to place a separate component for suppressing displacement on the upper portion of the battery cell assembly (100), the increased displacement of the battery cell assembly (100) can be suppressed, and damage to components and leakage of insulating oil due to increased displacement can be prevented.

[0075] More specifically, the reinforcing plate (201) includes a reinforcing main body (201a) positioned inside the frame member (200) and at least one reinforcing protrusion (201b) protruding from one surface of the reinforcing main body (201a) toward one surface of the frame member (200). For example, as shown in FIGS. 7 and 8, the reinforcing plate (201) may be positioned inside the upper portion of the frame member (200), the reinforcing main body (201a) may extend along the upper surface of the frame member (200), and at least one reinforcing protrusion (201b) may protrude from one surface of the reinforcing main body (201a) toward the upper surface of the frame member (200). Here, the reinforcing main body (201a) and the at least one reinforcing protrusion (201b) may have a structure in which they are integrated with each other.

[0076] For example, at least one reinforcing protrusion (201b) may be spaced apart from each other at equal intervals, as shown in FIGS. 4 to 7. However, the present invention is not limited thereto, and at least one reinforcing protrusion (201b) may be spaced apart from each other at different intervals.

[0077] The reinforcing body part (201a) may extend along the upper surface of the frame member (200). For example, as shown in FIGS. 6 and 7, the reinforcing body part (201a) may extend along the entire upper surface of the frame member (200), and the area of ​​the reinforcing body part (201a) may be equal to or smaller than the upper surface of the frame member (200). In addition, the reinforcing body part (201a) may be located inside the upper portion of the frame member (200).

[0078] At least one reinforcing protrusion (201b) may extend along the stacking direction of each battery cell stack (120a, 120b, FIG. 9). For example, as shown in FIGS. 6 and 7, at least one reinforcing protrusion (201b) may extend along the width direction of the battery cell assembly (100). However, the shape of the reinforcing protrusion (201b) is not limited thereto, and may have various shapes other than the bar shape as shown in FIGS. 6 and 7, and the reinforcing protrusion (201b) may extend in various directions. In addition, at least one reinforcing protrusion (201b) may be exposed on the upper surface of the frame member (200).

[0079] Accordingly, in the battery cell assembly (100) according to the present embodiment, the reinforcing plate (201) has a structure including a reinforcing main body (201a) and at least one reinforcing protrusion (201b), thereby supplementing the rigidity of the frame member (200).

[0080] In addition, when the reinforcing plate (201) is positioned on the upper portion of the frame member (200), the displacement direction toward the upper portion of the battery cell assembly (100) due to the internal hydraulic pressure of the battery cell assembly (100) corresponds to the protrusion direction of the reinforcing protrusion (201b), so that the reinforcing plate (201) can flexibly respond to changes in displacement amount due to the internal hydraulic pressure of the battery cell assembly (100).

[0081] In addition, the reinforcing plate (201) may further include reinforcing bend portions (201c) that are bent on both sides of the reinforcing main body (201a), as shown in FIGS. 7 and 8. Here, the reinforcing bend portions (201c) may extend along both sides of the frame member (200). For example, the reinforcing main body (201a) and the reinforcing bend portions (201c) may be integrally formed with each other. However, unlike FIGS. 7 and 8, the reinforcing bend portions (201c) may be omitted from the reinforcing plate (201).

[0082] Accordingly, in the battery cell assembly (100) according to the present embodiment, the reinforcing plate (201) has a structure including a reinforcing main body (201a) and a reinforcing bending portion (201c), so that the area where the reinforcing plate (201) comes into contact with the inside of the frame member (200) is expanded, and the reinforcing plate (201) can be stably fixed inside the frame member (200). In addition, the reinforcing plate (201) can supplement the rigidity of not only the upper portion of the frame member (200) but also the upper side of the frame member (200). In addition, even when the displacement amount toward the upper portion of the battery cell assembly (100) is changed due to the internal hydraulic pressure of the battery cell assembly (100), the reinforcing plate (201) can be more stably fixed due to the reinforcing bending portion (201c) of the reinforcing plate (201c).

[0083] Fig. 9 is a perspective view showing a battery cell stack, a first busbar assembly, and a second busbar assembly included in the battery cell assembly of Fig. 5. Fig. 10 is a plan view showing one of the battery cells included in the battery cell stack of Fig. 9.

[0084] Referring to FIGS. 4, 5, 9, and 10, the battery cell (110) is a pouch-type battery cell and may include electrode leads (130) protruding in both directions. This pouch-type battery cell may be formed by housing an electrode assembly in a pouch case of a laminate sheet including a resin layer and a metal layer, and then bonding the outer periphery of the pouch case. This battery cell (110) may have a rectangular sheet structure. Specifically, the battery cell (110) according to the present embodiment has a structure in which two electrode leads (130) protrude from one end (114a) and the other end (114b) of the battery body (113), respectively. More specifically, the electrode leads (130) may protrude in opposite directions, and one of these electrode leads (130) may be a positive electrode lead and the other may be a negative electrode lead. In this embodiment, the direction between the electrode leads (130) protruding in both directions of the battery cell (110) is referred to as the longitudinal direction of the battery cell (110). For example, referring to FIGS. 9 and 10, a direction parallel to the x-axis may correspond to the longitudinal direction of the battery cell (110).

[0085] The battery cell (110) can be manufactured by accommodating an electrode assembly (not shown) in the battery case (114) and bonding the two ends (114a, 114b) of the battery case (114) and one side (114c) connecting them. In other words, the battery cell (110) according to one embodiment of the present invention has a total of three sealing portions, and the sealing portions have a structure in which they are sealed by a method such as fusion, and the remaining other side portion can be formed as a folding portion (115).

[0086] These battery cells (110) may be configured in multiple units, and the multiple battery cells (110) are stacked so as to be electrically connected to each other to form a battery cell stack (120). The battery cell stack (120) includes a first battery cell stack (120a) and a second battery cell stack (120b). In particular, the battery cells (110) may be stacked in one direction while standing upright, with one side of the battery body (113) of the battery cells (110) facing each other. More specifically, as illustrated in FIGS. 5, 9, and 10, the battery cells (110) may be stacked in a direction from one side of the side surface of the frame member (200) to the other side while standing upright, such that one side of the battery body (113) of the battery cells (110) is parallel to the side surface of the frame member (200). For example, a plurality of battery cells (110) are stacked along a direction parallel to the y-axis. When a plurality of battery cells (110) are stacked along a direction parallel to the y-axis in this way, the electrode leads (130) of one battery cell (110) can protrude along the x-axis direction and the -x-axis direction, respectively.

[0087] In one area, a plurality of battery cells (110) may be stacked along a direction parallel to the y-axis to form a first battery cell stack (120a), and in another area, a plurality of battery cells (110) may be stacked along a direction parallel to the y-axis to form a second battery cell stack (120b).

[0088] The battery case (114) is generally composed of a laminate structure of a resin layer / metal film layer / resin layer. For example, if the surface of the battery case is composed of an O(oriented)-nylon layer, when a plurality of battery cells are laminated to form a medium- to large-sized battery cell assembly, the battery case tends to slip easily due to external impact. Therefore, in order to prevent this and maintain a stable laminated structure of the battery cells, an adhesive material such as a pressure-sensitive adhesive such as a double-sided tape or a chemical adhesive that is bonded by a chemical reaction during bonding may be attached to the surface of the battery case to form a first battery cell laminate (120a) and a second battery cell laminate (120b).

[0089] Meanwhile, the first battery cell stack (120a) and the second battery cell stack (120b) are arranged along a direction perpendicular to the direction in which the battery cells (110) in the first battery cell stack (120a) or the second battery cell stack (120b) are stacked. In other words, the first battery cell stack (120a) and the second battery cell stack (120b) may be arranged along the direction in which the electrode leads (130) protrude based on the battery cells (110). That is, the first battery cell stack (120a) and the second battery cell stack (120b) are arranged along the longitudinal direction of the battery cells (110). For example, as illustrated in FIG. 10, when a plurality of battery cells (110) are stacked along a direction parallel to the y-axis to form a first battery cell stack (120a) and a second battery cell stack (120b), the first battery cell stack (120a) and the second battery cell stack (120b) can be positioned along a direction parallel to the x-axis.

[0090] Referring to FIGS. 5 and 9, the battery cell assembly (100) according to the present embodiment may include first busbar assemblies (300a) positioned on the front and rear surfaces of the first battery cell stack (120a), respectively, and second busbar assemblies (300b) positioned on the front and rear surfaces of the second battery cell stack (120b), respectively. Specifically, the first busbar assemblies (300a) may be positioned in the direction in which the electrode leads (130) of the battery cells (110) included in the first battery cell stack (120a) protrude. In addition, the second busbar assemblies (300b) may be positioned in the direction in which the electrode leads (130) of the battery cells (110) included in the second battery cell stack (120b) protrude. The first busbar assembly (300a) and the second busbar assembly (300b) may each include a busbar frame, a busbar, and a terminal busbar, which will be described later.

[0091] Referring to FIGS. 5 and 9, the battery cell assembly (100) according to the present embodiment may include a sealing assembly (400). The sealing assembly (400) may be formed to be positioned on both open sides of the frame member (200) and cover the battery cell stack (120). The sealing assembly (400) positioned on one open side of the frame member (200) may be a first sealing assembly (410), and the sealing assembly (400) positioned on the other open side of the frame member (200) may be a second sealing assembly (450). That is, the battery cell assembly (100) according to the present embodiment may further include a first sealing assembly (410) and a second sealing assembly (450) that cover both open sides of the frame member (200), respectively.

[0092] The sealing assembly (400) can isolate the open sides of the frame member (200) from the external environment. Specifically, the sealing assembly (400) can perform a function of sealing the inside of the frame member (200) to prevent the refrigerant from leaking to the outside when the refrigerant is injected into the inside of the frame member (200).

[0093] Referring to FIGS. 4, 5, and 9, the battery cell assembly (100) according to the present embodiment may include an end plate (500). The end plate (500) may be formed to be positioned on both open sides of the frame member (200) and cover the sealing assembly (400). The end plate (500) positioned on one open side of the frame member (200) may be a first end plate (510), and the end plate (500) positioned on the other open side of the frame member (200) may be a second end plate (550).

[0094] These end plates (500) can physically protect the battery cell stack (120) and other electrical components from external impact.

[0095] Below, the components included in the battery cell assembly (100) of the present embodiment will be described in detail.

[0096] Fig. 11 is a perspective view showing a first battery cell stack and a first busbar assembly included in the battery cell assembly of Fig. 5. Fig. 12 is an exploded perspective view of the first battery cell stack and the first busbar assembly of Fig. 11. Fig. 13 is a perspective view showing a state in which side plates are further arranged on the battery cell stack and the first busbar assembly and the second busbar assembly of Fig. 9. Fig. 14 is an exploded perspective view showing the first battery cell stack and the second battery cell stack included in the battery cell stack of Fig. 13 in a separated state.

[0097] Referring to FIGS. 5, 9, 13, and 14 together, as described above, the battery cell stack (120) may include a first battery cell stack (120a) and a second battery cell stack (120b) arranged along the longitudinal direction of the battery cells (110). In addition, first bus bar assemblies (300a) may be positioned on each of the front and rear surfaces of the first battery cell stack (120a), and second bus bar assemblies (300b) may be positioned on each of the front and rear surfaces of the second battery cell stack (120b).

[0098] At this time, the first battery cell stack (120a) and the first bus bar assembly (300a) may be collectively referred to as a first sub-assembly (100a), and the second battery cell stack (120b) and the second bus bar assembly (300b) may be collectively referred to as a second sub-assembly (100b). Specifically, the battery cell assembly (100) according to the present embodiment may be one in which the first sub-assembly (100a) and the second sub-assembly (100b) are electrically coupled to each other and disposed inside the frame member (200), or may be individually mounted inside the frame member (200). That is, the battery cell assembly (100) according to the present embodiment corresponds to a twin model battery cell assembly having the first sub-assembly (100a) and the second sub-assembly (100b).

[0099] Referring to FIGS. 11 and 12, the first sub-assembly (100a) may include a first battery cell stack (120a) and a first busbar assembly (300a). The first busbar assemblies (300a) may be positioned on each of the front and rear surfaces of the first battery cell stack (120a). The first busbar assemblies (300a) may be positioned in a direction in which the electrode leads (130) of the battery cells (110) included in the first battery cell stack (120a) protrude. In addition, a first flexible printed circuit board (350a, Flexible Printed Circuit Board, FPCB) electrically connected to the first busbar assemblies (300a) may be provided.

[0100] The first battery cell stack (120a) may include a plurality of battery cells (110), at least one first cooling fin (210a) positioned between the plurality of battery cells (110), and a first compression pad (250a) provided on one surface of a battery cell (110) positioned at the outermost side among the battery cells (110).

[0101] The first cooling fin (210a) may be positioned between a plurality of battery cells (110). For example, the first cooling fin (210a) may be positioned between two battery cells (110). Specifically, one first cooling fin (210a) and another adjacent first cooling fin (210a) may be positioned with two battery cells (110) interposed therebetween.

[0102] The first cooling fin (210a) may include a first plate (211a) that is in contact with one side of the battery cell (110). Here, the one side of the battery cell (110) may be one side of the battery body (113, FIG. 10) of the battery cell (110), which may be one side of the battery cell (110) that extends along the longitudinal direction (x-axis direction).

[0103] One side of the first plate (211a) can be in contact with one side of a battery cell (110) facing the one side of the first plate (211a). The other side of the first plate (211a) can be in contact with one side of another adjacent battery cell (110) facing the other side of the first plate (211a). In this case, although not specifically illustrated, an adhesive member is interposed between the side of the battery cell (110) and the first plate (211a), so that the battery cell (110) and the first plate (211a) can be adhesively fixed. For example, the adhesive member can be an insulating tape.

[0104] The upper surface (z-axis direction) of the first plate (211a) can be in contact with the upper surface of the frame member (200), and the lower surface of the first plate (211a) can be in contact with the lower surface of the frame member (200). Accordingly, the first cooling fin (210a) can be fixedly positioned within the frame member (200), and thereby the battery cell (110) attached to the first cooling fin (210a) can also be fixedly positioned within the frame member (200).

[0105] When the size of the first plate (211a) is larger than the size of the battery cell (110), the upper and lower portions of the battery cell (110) can be positioned at a constant distance from the upper and lower surfaces of the frame member (200). Specifically, when the height of the first plate (211a) is longer than the height of the battery cell (110), the battery cell (110) can be positioned at the center of the first plate (211a) and be adhesively fixed. In this case, the upper and lower portions of the battery cell (110) can be positioned at a constant distance from the upper and lower surfaces of the frame member (200). Here, the heights of the battery cell (110) and the first plate (211a) refer to the lengths in the z-axis direction.

[0106] The first cooling fin (210a) may further include a first plate (211a) and a first protrusion (213a) protruding from one end of the first plate (211a). For example, the first cooling fin (210a) may have an L shape. Specifically, referring to FIG. 9, the first cooling fin (210a) may include a first plate (211a) having a surface corresponding to or larger than one side of the battery cell (110), and a first protrusion (213a) protruding from one end of the first plate (211a) so as to be parallel to the stacking direction (y-axis direction) of the first battery cell stack (120a).

[0107] The first protrusion (213a) is an area that protrudes in a direction perpendicular to the first plate (211a) and can be in contact with at least one of the upper or lower surface of the frame member (200). Specifically, one surface of the first protrusion (213a) can be positioned to face the upper or lower surface of the battery cell (110), and the other surface of the first protrusion (213a) can be in contact with the lower or upper surface of the frame member (200).

[0108] For example, one side of the first protrusion (213a) may be positioned facing the lower surface of the battery cell (110), and the upper and lower surfaces of the battery cell (110) may be positioned while being adhesively fixed to the first plate (211a) at a predetermined height from the upper and lower surfaces of the frame member (200). That is, a predetermined space may be provided between one side of the first protrusion (213a) and the lower surface of the battery cell (110) and between the upper surface of the frame member (200) and the upper surface of the battery cell (110), so that the coolant described later may move between these spaces. In this case, the distance between one side of the first protrusion (213a) and the lower surface of the battery cell (110) may correspond to the distance between the upper surface of the frame member (200) and the upper surface of the battery cell (110).

[0109] The other surface of the first protrusion (213a) can be in contact with the bottom of the frame member (200). Specifically, the other surface of the first protrusion (213a) can be bonded and fixed while in contact with the bottom of the frame member (200), thereby allowing the first cooling fin (210a) to be fixed and positioned within the frame member (200).

[0110] However, the shape of the first cooling fin (210a) is not limited to this drawing, and may be a flat plate shape, and any shape is possible as long as it can be in contact with the battery cell (110) and fix the battery cell (110).

[0111] The first cooling fin (210a) may be made of metal. Specifically, the first cooling fin (210a) may be made of a metal having high thermal conductivity. Therefore, the first cooling fin (210a) can directly receive heat generated from the battery cell (110) by charging and discharging the battery. When heat is generated, the heat is primarily cooled as it is transferred to the first cooling fin (210a) in contact with the side surface of the battery cell (110), and a coolant, which will be described later, can directly contact the upper and lower portions of the battery cell (110) to perform secondary cooling. Accordingly, direct cooling is possible even for the upper and lower portions of the battery cell, which were relatively difficult to cool in the past, thereby improving cooling efficiency.

[0112] The first compression pad (250a) may be positioned at the outermost side of the first battery cell stack (120a). This first compression pad (250a) may serve to absorb swelling of the battery cells (110) due to charging and discharging. Specifically, the first compression pad (250a) may prevent the battery case (114, FIG. 10) of the battery cells (110) from breaking by pushing the side surface of the frame member (200) as the battery cells (110) swell, thereby improving the safety of the battery cell assembly (100).

[0113] However, the first compression pad (250a) is not limited to being located only on the outermost side of the first battery cell stack (120a), but may also be located between the battery cells (110) constituting the first battery cell stack (120a).

[0114] The first busbar assembly (300a) may include a first busbar frame (310a) and a first busbar (330a) mounted on the first busbar frame (310a).

[0115] The first busbar frame (310a) may be positioned on one surface of the first battery cell stack (120a), and may cover one surface of the first battery cell stack (120a) while simultaneously guiding the connection between the first battery cell stack (120a) and an external device. The first busbar frame (310a) may be positioned on one surface and the other surface of the first battery cell stack (120a).

[0116] A first busbar (330a) may be mounted on the first busbar frame (310a). For example, the inner surface of the first busbar frame (310a) may face the first battery cell stack (120a), and the first busbar (330a) may be mounted on the outer surface of the first busbar frame (310a).

[0117] The first busbar frame (310a) may include an electrically insulating material. The first busbar frame (310a) may limit contact between the first busbar (330a) and other parts of the battery cells (110) other than the part where the first busbar (330a) is connected to the electrode lead (not shown), thereby preventing electrical shorts from occurring.

[0118] The first bus bar (330a) is mounted on the outer surface of the first bus bar frame (310a) and may be used to electrically connect the battery cells (110) included in the first battery cell stack (120a) and electrically connect the first battery cell stack (120a) with an external device circuit. The first bus bar (330a) is positioned on the first bus bar frame (310a), and the first bus bar assembly (300a) is covered by the sealing assembly (400) and end plate (500) described below, so that it can be protected from external impacts, etc., and deterioration of durability due to external moisture, etc. can be minimized.

[0119] The first bus bar (330a) can be electrically connected to the first battery cell stack (120a) through the electrode lead (130) of the battery cell (110). Specifically, the electrode lead (130) of the battery cell (110) can be bent after passing through a slit formed in the first bus bar frame (310a) to be connected to the first bus bar (330a). The battery cells (110) included in the first battery cell stack (120a) can be electrically connected in series or parallel by the first bus bar (330a). There is no particular limitation on the connection method between the electrode lead (130) and the first bus bar (330a), and for example, welding may be applied.

[0120] The first flexible printed circuit board (350a) is configured to extend in the longitudinal direction of the battery cells (110) and be mounted to sense the battery cells (110). That is, as shown in FIGS. 11 and 12, the first flexible printed circuit board (350a) is positioned on the upper surface of the first battery cell stack (120a) and senses voltage data or thermal data of the battery cells (110). In particular, the first flexible printed circuit board (350a) can be electrically connected to the first bus bar (330a) while being bent toward the first bus bar frame (310a) at one end. Accordingly, the voltage data of each battery cell (110) can be sensed and transmitted to the outside.

[0121] The second sub-assembly (100b) may include a second battery cell stack (120b) and a second busbar assembly (300b), and the second busbar assembly (300b) may include a second busbar frame (310b) and a second busbar (330b). In addition, a second flexible printed circuit board (350b) connecting the second busbar assemblies (300b) may be provided.

[0122] The second busbar frame (310b) may be positioned on one surface of the second battery cell stack (120b) to cover one surface of the second battery cell stack (120b) and simultaneously guide the connection between the second battery cell stack (120b) and an external device. The second busbar frame (310b) may be positioned on one surface and the other surface of the second battery cell stack (120b).

[0123] The components included in the second sub-assembly (100b) may have structures identical or similar to those of the components included in the first sub-assembly (100a) described above. Therefore, to avoid duplication of explanation, a detailed description of the components included in the second sub-assembly (100b) is omitted.

[0124] Referring to FIGS. 13 and 14, in the battery cell assembly (100) according to the present embodiment, side plates (270) may be provided on both sides of the first sub-assembly (100a) and the second sub-assembly (100b), respectively.

[0125] The side plate (270) may be a plate extending along the length of the battery cell (110). For example, the side plate (270) may be a metal having rigidity.

[0126] More specifically, side plates (270) may be provided on both sides of the first sub-assembly (100a) and on both sides of the second sub-assembly (100b), respectively. Here, the length of the side plates (270) may correspond to the sum of the lengths of the first sub-assembly (100a) and the second sub-assembly (100b).

[0127] The side plate (270) can be positioned facing the outermost battery cell (110) among the battery cells (110) included in the first sub-assembly (100a) and the outermost battery cell (110) among the battery cells (110) included in the second sub-assembly (100b).

[0128] Additionally, the side plate (270) can be positioned facing the first compression pad (250a) included in the first sub-assembly (100a) and the second compression pad (250b) included in the second sub-assembly (100b).

[0129] Accordingly, in the battery cell assembly (100) according to the present embodiment, the side plate (270) can play a role in protecting the outermost battery cells (110) or compression pads (250a, 250b) of the first sub-assembly (100a) and the second sub-assembly (100b) when the first sub-assembly (100a) and the second sub-assembly (100b) are each inserted and mounted in the frame member (200) with the insulating plate (700) therebetween.

[0130] In addition, since the battery cell assembly (100) of the present embodiment is a twin model having a first battery cell stack (120a) and a second battery cell stack (120b), and the battery cell stack (120) is longer than a typical battery cell stack, it may not be easy to assemble by inserting it into the frame member (200). In this case, as illustrated in FIGS. 13 and 14, the side plate (270) guides the insertion of the battery cell stack (120) into the frame member (200), thereby enabling the battery cell assembly to be easily assembled without damage to the battery cells (110) and the compression pads (250a, 250b).

[0131] Below, a structure for circulating a coolant inside a battery cell assembly according to the present embodiment will be described in detail.

[0132] Referring again to FIGS. 4, 5, and 14, the battery cell assembly (100) according to the present embodiment includes an inlet (421) and an outlet (461) for circulating a coolant into the interior of the frame member (200). The coolant is introduced into the interior of the frame member (200) through the inlet (421) and then discharged to the exterior of the battery cell assembly (100) through the outlet (461).

[0133] The above refrigerant can directly contact the battery cell stack (120), the first and second bus bar assemblies (300a, 300b) and other electrical components stored inside the frame member (200) and receive heat generated from them.

[0134] The above-described refrigerant may be a fluid. However, since the refrigerant directly contacts the battery cell stack (120), the first and second busbar assemblies (300a, 300b), and other electrical components within the battery cell assembly (100), the refrigerant must be electrically insulated. Accordingly, the refrigerant may be a material having insulating properties. For example, the refrigerant may be an insulating oil.

[0135] That is, in the case of the present embodiment, the coolant can directly cool the battery cell stack (120), the first and second bus bar assemblies (300a, 300b), and other electrical components that generate heat within the battery cell assembly (100) by directly contacting them and receiving heat therefrom. Therefore, compared to indirectly cooling the battery module (1) using a heat sink (6), etc. in a conventional battery module (1, see FIG. 3), the battery cell assembly (100) according to the present embodiment can improve cooling efficiency through direct cooling, thereby extending the life of the battery.

[0136] At this time, in the present embodiment, an insulating plate (700) is placed between the first battery cell stack (120a) and the second battery cell stack (120b), and an opening (700H) through which the coolant passes is formed in the insulating plate (700). For example, the opening (700H) may be formed in the center of the insulating plate (700), and more specifically, the opening (700H) may be opened in a rectangular shape in which the upper and lower sides are longer than the two side sides. That is, the opening (700H) may be opened so as to extend along the direction in which the battery cells (110) are stacked.

[0137] The insulating plate (700) may include a material having electrical insulating properties. For example, the insulating plate (700) may be a plastic injection molded product.

[0138] More specifically, with respect to the insulating plate (700), the inlet (421) and the outlet (461) may be positioned on opposite sides. The first battery cell stack (120a) may be positioned between the inlet (421) and the insulating plate (700), and the second battery cell stack (120b) may be positioned between the outlet (461) and the insulating plate (700).

[0139] The refrigerant introduced through the inlet (421) can sequentially pass through the first battery cell stack (120a), the opening (700H) of the insulating plate (700), and the second battery cell stack (120b), and be discharged through the outlet (461).

[0140] Since both the first battery cell stack (120a) and the second battery cell stack (120b) are included within one frame member (200), there is a risk of a short circuit occurring due to contact between the first battery cell stack (120a) and the second battery cell stack (120b) or contact between the first bus bar assembly (300a) located on the other side of the first battery cell stack (120a) and the second bus bar assembly (300b) located on one side of the second battery cell stack (120b).

[0141] In addition, as described above, the battery cell assembly (100) according to the present embodiment has a shape extending in the longitudinal direction, including the first battery cell stack (120a) and the second battery cell stack (120b). When the coolant circulates inside the frame member (200), a section where the flow of the coolant stagnates may occur between the first battery cell stack (120a) and the second battery cell stack (120b).

[0142] Accordingly, in this embodiment, an insulating plate (700) having electrical insulation was placed between the first battery cell stack (120a) and the second battery cell stack (120b). By using the insulating plate (700), electrical insulation and creepage distance between the first battery cell stack (120a) and the second battery cell stack (120b) or between the first bus bar assembly (300a) and the second bus bar assembly (300b) were secured.

[0143] In addition, by designing the insulating plate (700) so that an opening (700H) through which the refrigerant passes is formed in the center of the insulating plate (700), the flow of the refrigerant is prevented from stagnating in the space between the first battery cell stack (120a) and the second battery cell stack (120b). In other words, the flow of the refrigerant is secured to increase the cooling performance.

[0144] Referring to FIGS. 5 and 9, as described above, the battery cell assembly (100) may include a first sealing assembly (410) and a second sealing assembly (450) that cover the open sides of the frame member (200), respectively. The inlet (421) may be formed in the first sealing assembly (410), and the outlet (461) may be formed in the second sealing assembly (450).

[0145] As described above, the battery cell (110) according to the present embodiment is a pouch-type battery cell and may include electrode leads (130) protruding in both directions. The direction between the electrode leads (130) protruding in both directions may be referred to as the longitudinal direction of the battery cell (110). A direction parallel to the x-axis may correspond to the longitudinal direction of the battery cell (110). Along this longitudinal direction, the first sealing assembly (410), the first battery cell stack (120a), the insulating plate (700), the second battery cell stack (120b), and the second sealing assembly (450) may be sequentially positioned. That is, the refrigerant introduced through the inlet (421) formed in the first sealing assembly (410) can sequentially pass through the first battery cell stack (120a), the opening (700H) of the insulating plate (700), and the second battery cell stack (120b), and be discharged through the outlet (461) formed in the second sealing assembly (450).

[0146] In the battery cell assembly (100) according to the present embodiment, the first busbar assembly (300a) electrically connected to the battery cell stack may be positioned on an open side of the frame member (200), and the first sealing assembly (410) may be mounted while covering the first busbar assembly (300a). More specifically, the first sealing assembly (410) may cover the first busbar assembly (300a) located on one side of the first battery cell stack (120a).

[0147] The inlet (421) may be positioned lower than the center based on the height of the battery cell stack (120). The inlet (421) may be positioned close to the lower end of the first sealing assembly (410). Specifically, the inlet (421) may be positioned lower than the center based on the height of the first sealing assembly (410). Here, the height of the battery cell stack (120) or the first sealing assembly (410) refers to the length in the z-axis direction in the drawing.

[0148] In summary, the position of the inlet (421) and the position of the outlet (461) described above can be positioned lower than the center based on the height of the battery cell stack (120), and the outlet (461) can be positioned higher than the center based on the height of the battery cell stack (120). That is, the inlet (421) can be positioned close to the lower end of the first sealing assembly (410), and the outlet (461) can be positioned close to the upper end of the second sealing assembly (450).

[0149] If the inlet (421) is located above the center based on the height of the battery cell stack (120), there is a possibility that bubbles may form inside the coolant because the coolant flows into the inside of the battery cell assembly (100) as if it were falling from a high position. These bubbles become a factor that hinders the cooling effect.

[0150] In addition, if the outlet (461) is located lower than the center based on the height of the battery cell stack (120), the coolant introduced into the inside of the battery cell assembly (100) is filled only up to the height of the outlet (461) and then escapes to the outside, so the inside of the battery cell assembly (100) is not filled with a sufficient amount of coolant, which may result in a decrease in cooling performance.

[0151] Therefore, in order to prevent bubbles from forming in the incoming coolant and to fill the inside of the battery cell assembly (100) with coolant, it is preferable that the inlet (421) be positioned lower than the center based on the height of the battery cell stack (120), and the outlet (461) be positioned higher than the center based on the height of the battery cell stack (120).

[0152] Referring to FIG. 14, in the battery cell assembly (100) according to the present embodiment, the electrical connection between the first battery cell stack (120a) and the second battery cell stack (120b) can be made through the first and second through holes (700H1, 700H2) formed in the insulating plate (700).

[0153] Specifically, the electrode lead (not shown) located at the outermost side in the first battery cell stack (120a) and the electrode lead (not shown) located at the outermost side in the second battery cell stack (120b) can be connected to each other by passing through one of the first through holes (700H1) formed in the insulating plate (700). It is preferable that the first through holes (700H1) be opened only to a size that allows the outermost electrode leads (not shown) to barely pass through.

[0154] A connection cable (380) connecting a first flexible printed circuit board (350a) located in a first sub-assembly (100a) and a second flexible printed circuit board (350b) located in a second sub-assembly (100b) can pass through a second through hole (700H2) formed in an insulating plate (700). It is preferable that the second through holes (700H2) be opened only to a size that allows the connection cable (380) to barely pass through.

[0155] However, it is not limited thereto, and unlike FIG. 14, separate through holes (700H1, 700H2) are not formed in the insulating plate (700), and there may be no electrical connection between the first battery cell stack (120a) and the second battery cell stack (120b). That is, in the battery cell assembly (100) according to another embodiment, the first battery cell stack (120a) and the second battery cell stack (120b) may be individually electrically connected to external electrical components.

[0156] FIG. 15 and FIG. 16 are perspective views showing a battery cell assembly according to another embodiment of the present invention.

[0157] Referring to FIGS. 15 and 16, a battery cell assembly (101, 102) according to another embodiment of the present invention can be described mostly in the same way as the battery cell assembly (100) described in FIGS. 1 to 14, and only the reinforcing plates (202, 202) corresponding to the different parts from the battery cell assembly (100) will be specifically described.

[0158] As described above, the battery cell assembly (101, 102) according to the present embodiment has a structure in which a plurality of battery cell stacks (120a, 120b) are arranged along the longitudinal direction of the battery cell assembly (101, 102). Therefore, as the length of the battery cell assembly (100) becomes relatively longer, the displacement of the battery cell assembly (100) may also relatively increase. In particular, the central portion of the battery cell assembly (101, 102) has a greater displacement than the two ends of the battery cell assembly (101, 102), and if the displacement is not suppressed, problems such as damage to components and leakage of insulating oil may occur.

[0159] Referring to FIG. 15, in the battery cell assembly (101) according to the present embodiment, at least one reinforcing protrusion (202b) may be spaced apart from each other at equal intervals and may have a wider area as it gets closer to the center from the end of the battery cell assembly (101).

[0160] Referring to FIG. 16, in the battery cell assembly (102) according to the present embodiment, at least one reinforcing protrusion (203b) may have the same area and may be spaced apart at a narrower interval as it approaches the center from the end of the battery cell assembly (102).

[0161] Accordingly, the battery cell assembly (101, 102) according to the present embodiment has an advantage in that the displacement amount relative to the upper central portion of the battery cell assembly (101, 102) can be more effectively suppressed by increasing the proportion of the reinforcing protrusions (202b, 203b) closer to the center of the upper portion of the battery cell assembly (101, 102).

[0162] 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.

[0163] One or more battery cell assemblies according to the above-described embodiment can be mounted together with various control and protection systems such as a BMS (Battery Management System), a BDU (Battery Disconnect Unit), and a cooling system to form a battery pack.

[0164] The above-mentioned battery cell assembly or battery pack 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 that can use secondary batteries.

[0165] 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.

[0166] [Explanation of symbols]

[0167] 100, 101, 102: Battery cell assembly

[0168] 110: Battery cell

[0169] 120: Battery cell stack

[0170] 120a: First battery cell stack

[0171] 120b: Second battery cell stack

[0172] 200: Absence of frame

[0173] 201, 202, 203: Reinforcement plates

[0174] 201a: Reinforced main body

[0175] 201b: Protrusion

[0176] 201c: Reinforced bend

[0177] 210: Cooling fins

[0178] 250: Compression pad

[0179] 270: Side plate

[0180] 300a: First busbar assembly

[0181] 300b: Second busbar assembly

[0182] 400: Sealing assembly

[0183] 500: End Plate

[0184] 700: Insulating plate

[0185] 700H: Aperture

Claims

1. A battery cell stack in which multiple battery cells are stacked; A frame member accommodating the above battery cell stack; and Includes an inlet and an outlet for circulating refrigerant into the interior of the above frame member, The above refrigerant flows into the frame member through the inlet and is discharged through the outlet, A reinforcing plate is inserted into at least one of the upper or lower portion of the above frame member, A battery cell assembly in which the reinforcing plate includes a reinforcing main body portion located inside the frame member and at least one reinforcing protrusion portion protruding from one surface of the reinforcing main body portion toward one surface of the frame member.

2. In paragraph 1, A battery cell assembly in which the inside of the above frame member and the outside of the above reinforcement plate are in close contact with each other.

3. In paragraph 1, The above reinforcing plate is inserted into the upper part of the above frame member, The above reinforcing body part is a battery cell assembly extending along the upper surface of the frame member.

4. In paragraph 1, A battery cell assembly in which the reinforcing plate includes reinforcing bends bent on each side of the reinforcing main body, and the reinforcing bends extend along each side of the frame member.

5. In paragraph 1, A battery cell assembly wherein each of the at least one reinforcing protrusion extends along the stacking direction of the battery cell stack.

6. In paragraph 5, A battery cell assembly wherein at least one of the reinforcing protrusions is spaced apart from each other at equal intervals.

7. In paragraph 6, A battery cell assembly wherein at least one reinforcing protrusion has a larger area as it approaches the center from an end of the battery cell assembly.

8. In paragraph 5, A battery cell assembly in which at least one reinforcing protrusion is spaced at a narrower interval as it approaches the center from an end of the battery cell assembly.

9. In paragraph 1, A battery cell assembly in which the above reinforcing plate is made of a material having higher rigidity than the above frame member.

10. In paragraph 9, A battery cell assembly in which the above frame member is made of a resin material and the above reinforcement plate is made of a steel material.

11. In paragraph 1, The above battery cell stack includes a first battery cell stack and a second battery cell stack, An insulating plate is placed between the first battery cell stack and the second battery cell stack, A battery cell assembly having an opening formed in the insulating plate through which the coolant passes.

12. In paragraph 11, Based on the above insulating plate, the inlet and the outlet are located on opposite sides, The first battery cell stack is positioned between the inlet and the insulating plate, A battery cell assembly in which the second battery cell stack is positioned between the outlet and the insulating plate.

13. In paragraph 12, A battery cell assembly in which the refrigerant introduced through the inlet sequentially passes through the first battery cell stack, the opening of the insulating plate, and the second battery cell stack, and is discharged through the outlet.

14. In paragraph 1, Further comprising a first sealing assembly and a second sealing assembly covering each of the open sides of the frame member, The inlet is formed in the first sealing assembly, and the outlet is formed in the second sealing assembly. A battery cell assembly wherein the inlet is located below the center based on the height of the first sealing assembly, and the outlet is located above the center based on the height of the second sealing assembly.

15. In paragraph 14, The above battery cell includes electrode leads protruding in both directions, A battery cell assembly in which the first sealing assembly, the first battery cell stack, the insulating plate, the second battery cell stack, and the second sealing assembly are sequentially positioned along the longitudinal direction, when the direction between the electrode leads is referred to as the longitudinal direction.

16. In paragraph 1, The above refrigerant is insulating oil, A battery cell assembly in which the refrigerant is in direct contact with the battery cell stack stored inside the frame member.

17. A battery pack comprising a battery cell assembly according to paragraph 1.

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