Battery cell assembly and battery pack

Abstract

Disclosed is a battery cell assembly comprising: a plurality of battery cells stacked in a first direction; and a frame for accommodating the plurality of battery cells. The frame includes at least one arched sidewall.

Description

Battery cell assembly and battery pack

[0001] The present invention relates to a battery cell assembly and a battery pack, and more specifically, to a battery cell assembly and a battery pack that delay and suppress the spread of thermal events.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0188742 dated December 17, 2024, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification.

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has decreased dramatically due to improved energy density and economies of scale, and as the driving range of BEVs (battery electric vehicles) has increased to a level equivalent to that of fuel vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0004] The trend in the technological development of secondary batteries for mobility is the improvement of energy density and safety. The safety of secondary batteries for mobility is critical as it is directly related to the lives of passengers. The safety of secondary batteries can be achieved through mechanical robustness, the reliability of electrical insulation, and the delay of heat transfer in the event of a thermal runaway event.

[0005] The first problem that the technical concept of the present disclosure aims to solve is to provide a battery cell assembly that delays and suppresses thermal events.

[0006] The second problem that the technical concept of the present disclosure aims to solve is to provide a battery pack that delays and suppresses thermal events.

[0007] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description of the invention below.

[0008] The present disclosure relates to a battery cell assembly, wherein in one embodiment, a plurality of battery cells stacked in a first direction; and a frame accommodating the plurality of battery cells. The frame comprises at least one arch-shaped side wall.

[0009] In some embodiments, the arch shape may be an arch shape that is concave toward the plurality of battery cells.

[0010] In some embodiments, the outer surface of the at least one arch-shaped side wall may be in the shape of the arch.

[0011] In some embodiments, the at least one arch-shaped side wall includes two arch-shaped side walls, and the two arch-shaped side walls may be spaced apart from each other in the first direction.

[0012] In some embodiments, a compression pad may be placed between each of the two arch-shaped side walls and the plurality of battery cells.

[0013] In some embodiments, the at least one arch-shaped side wall may include at least one empty space inside.

[0014] In some embodiments, the at least one empty space comprises four empty spaces, and the four empty spaces comprise a first upper space, a second upper space, a first lower space, and a second lower space, and the first upper space and the first lower space may be symmetrical with respect to the horizontal plane of the midpoint height of the vertical length of the at least one arch-shaped side wall, and the second upper space and the second lower space may be symmetrical.

[0015] In some embodiments, the at least one empty space may be at least partially filled with a coolant.

[0016] In some embodiments, the concave portion of the at least one arch-shaped side wall may include an arch pad.

[0017] In some embodiments, the at least one arch-shaped side wall may include at least one through hole.

[0018] In some embodiments, the at least one through hole comprises four through holes, and the four through holes comprise a first upper hole, a second upper hole, a first lower hole, and a second lower hole, and the first upper hole and the first lower hole are symmetrical with respect to the horizontal plane of the midpoint height of the vertical length of the at least one arch-shaped side wall, and the second upper hole and the second lower hole may be symmetrical.

[0019] The present disclosure relates to a battery pack, wherein in one embodiment, it comprises: a lower plate; a side plate surrounding the lower plate of the pack; and a plurality of battery cell assemblies disposed in a receiving space partitioned by the lower plate and the side plate. The battery cell assembly comprises a plurality of battery cells stacked in a first direction; and a frame accommodating the plurality of battery cells, wherein the frame comprises at least one arch-shaped side wall.

[0020] In some embodiments, the arch shape is an arch shape that is concave toward the plurality of battery cells, and the outer surface of the side wall of at least one arch shape may be the arch shape.

[0021] In some embodiments, the at least one arch-shaped side wall may include two arch-shaped side walls. The two arch-shaped side walls may be spaced apart from each other in the first direction.

[0022] In some embodiments, a compression pad may be placed between each of the two arch-shaped side walls and the plurality of battery cells.

[0023] In some embodiments, the at least one arch-shaped side wall may include at least one empty space inside.

[0024] In some embodiments, the at least one empty space comprises four empty spaces, and the four empty spaces comprise a first upper space, a second upper space, a first lower space, and a second lower space, and the first upper space and the first lower space may be symmetrical with respect to the horizontal plane of the midpoint height of the vertical length of the at least one arch-shaped side wall, and the second upper space and the second lower space may be symmetrical.

[0025] In some embodiments, the at least one empty space may be at least partially filled with a coolant.

[0026] In some embodiments, the concave portion of the side wall in the shape of at least one arch may include an arch pad.

[0027] In some embodiments, the at least one arch-shaped side wall may include at least one through hole.

[0028] In some embodiments, the side plate has first hollow passages extending in the first direction and second hollow passages extending in a second direction perpendicular to the first direction, the first hollow passages are connected to the second hollow passages, and the second hollow passages can be connected to the at least one through hole.

[0029] In some embodiments, a center beam may be further included that is disposed between the plurality of battery cell assemblies and extends in the first direction. The center beam has, internally, third hollow passages extending in the second direction and a center hollow passage extending in the first direction, wherein the third hollow passages are connected to the center hollow passage and the third hollow passages may be connected to the at least one through hole.

[0030] In some embodiments, the at least one through hole comprises four through holes, and the four through holes comprise a first upper hole, a second upper hole, a first lower hole, and a second lower hole, and the first upper hole and the first lower hole are symmetrical with respect to the horizontal plane of the midpoint height of the vertical length of the at least one arch-shaped side wall, and the second upper hole and the second lower hole may be symmetrical.

[0031] The battery cell assembly of the present disclosure having the above configuration can withstand the swelling force resulting from the charging and discharging of the battery cell.

[0032] The battery cell assembly of the present disclosure can delay and suppress the spread of thermal events by withstanding the swelling force resulting from the charging and discharging of the battery cell.

[0033] The battery cell assembly of the present disclosure can delay and suppress the spread of thermal events based on insulation and cooling.

[0034] The battery pack of the present disclosure having the above-described configuration can withstand the swelling force resulting from the charging and discharging of the battery cells.

[0035] The battery pack of the present disclosure can delay and suppress the spread of thermal events by withstanding the swelling force resulting from the charging and discharging of the battery cells.

[0036] The battery pack of the present disclosure can delay and suppress the spread of thermal events based on insulation and cooling.

[0037] However, the technical effects obtainable through the present disclosure are not limited to those described above, and other unmentioned effects will be clearly understood by a person skilled in the art from the description of the invention below.

[0038] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0039] FIG. 1 is a perspective view of a battery cell assembly according to one embodiment of the present disclosure.

[0040] FIGS. 2 to 4 are cross-sectional views taken along the A-A' line of the battery cell assembly of FIG. 1 according to one embodiment of the present disclosure.

[0041] FIG. 5 is a plan view of a battery pack according to one embodiment of the present disclosure.

[0042] FIG. 6 is a perspective view of a battery pack according to one embodiment of the present disclosure.

[0043] FIG. 7 is a cross-sectional view of the battery pack of FIG. 6 cut along line B-B' according to one embodiment of the present disclosure.

[0044] FIG. 8 is a perspective view of a battery cell assembly according to one embodiment of the present disclosure.

[0045] FIG. 9 is a plan view of a battery pack according to one embodiment of the present disclosure.

[0046] FIG. 10 is a plan view of a battery pack according to one embodiment of the present disclosure.

[0047] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0048] Therefore, it should be understood that the embodiments described in this disclosure and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0049] In addition, in describing the present disclosure, if it is determined that a detailed description of related known configurations or functions could obscure the essence of the present invention, such detailed description may be omitted.

[0050]

[0051] The embodiments of the present disclosure are provided to more fully explain the invention to those skilled in the art; therefore, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion.

[0052]

[0053]

[0054] [First embodiment]

[0055] FIG. 1 is a perspective view of a battery cell assembly according to one embodiment of the present disclosure. FIGS. 2 to 4 are cross-sectional views of the battery cell assembly of FIG. 1 according to one embodiment of the present disclosure, taken along the line A-A'. FIGS. 2, 3, and 4 illustrate different embodiments.

[0056] Referring to FIGS. 1 to 4, a battery cell assembly (100) refers to a collection of battery cells in which a plurality of battery cells (130) are structurally and electrically connected. Depending on the method of structurally connecting the plurality of battery cells (130), the battery cell assembly (100) may be referred to by various terms such as a battery module, a battery block, or a battery unit.

[0057] Each of the plurality of battery cells (130) may be a lithium-ion battery. Each of the plurality of battery cells (130) includes an electrode assembly, an electrolyte, and a case. Each of the plurality of battery cells (130) may be any one of a cylindrical battery cell, a prismatic battery cell, and a pouch-type battery cell. The electrode assembly of the cylindrical battery cell is embedded in a cylindrical metal can. The electrode assembly of the prismatic battery cell is embedded in a prismatic metal can. The electrode assembly of the pouch-type battery cell is embedded in a pouch case containing an aluminum laminate sheet.

[0058] In some embodiments, each of the plurality of battery cells (130) may be a lithium-ion battery, a lithium-ion polymer battery, or a lithium-polymer battery.

[0059] In some embodiments, the electrode assembly may include an anode, a cathode, and a separator interposed between the anode and the cathode. In some embodiments, the electrode assembly may be either a jelly-roll type or a stack type. In some embodiments, the jelly-roll type electrode assembly may include a wound structure of an anode, a cathode, and a separator interposed between them. In some embodiments, the stack type electrode assembly may include a plurality of anodes, a plurality of cathodes, and a plurality of separators interposed between them, which are sequentially stacked.

[0060] In some embodiments, the frame (110) and the end plate (120) can protect the battery cell assembly (100) from external shocks, heat, vibrations, etc. The battery cell assembly (100) can be mounted on the frame (110). The frame (110) may include a frame bottom (115), a side wall (111) connected to the frame bottom (115), and a frame top (113) connected to the side wall (111). The frame (110) can cover the bottom surface, sides, and top surface of a plurality of battery cells (130) mounted on the frame (110). The top surface of the frame (110) may include a plurality of exhaust holes (114). The plurality of exhaust holes (114) may provide a path for releasing gas generated from the cell assembly (100). The end plate (120) can be coupled to the frame (110). The end plates (120) may be fixed to the frame (110), for example, by welding. The end plates (120) fixed to the frame (110) may cover the front and rear of the battery cell assembly (100). The end plates (120) coupled to the frame (110) may cover a bus bar assembly (not shown). The bus bar assembly may include a bus bar and a bus bar frame. The bus bar may be connected to the electrode leads of the battery cell assembly (100) to electrically connect the battery cell assemblies (100) to each other. The bus bar may be placed on the bus bar frame. Meanwhile, the bus bar plate may be placed adjacent to the electrode leads. The electrode leads of the battery cell assembly (100) may be configured to pass through slits formed in the bus bar plate to be electrically connected to the bus bar. The bus bar plate may include an insulating material such as a non-conductive synthetic resin. The bus bar may include a conductive material such as metal. The end plate (120) may include any one of aluminum, titanium, magnesium, tantalum, niobium, and alloys thereof.

[0061] A battery cell assembly (100) according to an exemplary embodiment of the present disclosure comprises a plurality of battery cells (130) stacked in a first direction (e.g., X direction) and a frame (110) that accommodates the plurality of battery cells (130). The frame (110) may include at least one arch-shaped side wall (111). Referring to FIGS. 2 through 4, in some embodiments, the arch shape may be an arch shape that is concave toward the plurality of battery cells (130). In some embodiments, the outer surface of the side wall (111) may have an arch shape, and the inner surface may be flat. As a specific embodiment, the inner surface of the side wall (111) that may come into contact with the battery cells (130) or pad (140) may be flat, and the outer surface of the side wall (111) facing outward from the battery cell assembly (100) may be an arch shape that is concave toward the plurality of battery cells (130).

[0062] In some embodiments, the at least one arch-shaped side wall (111) may include two arch-shaped side walls. The two arch-shaped side walls may be spaced apart from each other in the first direction (X direction). In some embodiments, a compression pad (140) may be disposed between each of the two arch-shaped side walls and the plurality of battery cells (130). In some embodiments, the compression pad (140) may be further disposed between the plurality of battery cells (130).

[0063] In some embodiments, the at least one arch-shaped side wall (111) may include at least one empty space (112) inside. In some embodiments, the at least one empty space (112) may include four empty spaces (112_1, 112_2, 112_3, 112_4). The four empty spaces (112_1, 112_2, 112_3, 112_4) may include a first upper space (112_1), a second upper space (112_2), a first lower space (112_4), and a second lower space (112_3). In some embodiments, the cross-sections of the first upper space (112_1), the second upper space (112_2), the first lower space (112_4), and the second lower space (112_3) may each be generally triangular. In some embodiments, the first upper space (112_1) and the first lower space (112_4) are symmetrical with respect to the horizontal plane of the midpoint height of the vertical length of the at least one arch-shaped side wall, and the second upper space (112_2) and the second lower space (112_3) may be symmetrical.

[0064] In some embodiments, the at least one empty space (112) may be at least partially filled with a coolant (160). The coolant (160) may at least partially fill the at least one empty space (112). The coolant (160) may have high thermal conductivity and insulating properties. The coolant (160) may include one or more of mineral oil, synthetic oil, silicone oil, and fluorinated fluid. The coolant (160) may also include deionized water.

[0065] In some embodiments, the concave portion of the at least one arch-shaped side wall (111) may include an arch pad (150). The arch pad (150) may include a convex surface and a flat surface facing the plurality of battery cells (130). The convex surface facing the plurality of battery cells (130) may be in close contact with the concave portion of the at least one arch-shaped side wall (111). That is, the convex surface of the arch pad (150) facing the plurality of battery cells (130) and the concave portion of the at least one arch-shaped side wall (111) may be in contact with each other.

[0066] The compression pad (140) and the arch pad (150) may be protective members for reinforcing electrical insulation, impact resistance, and wear resistance for the battery cell assembly (100). The compression pad (140) and the arch pad (150) may include a compressible material such as polyurethane (PU). Additionally, the compression pad (140) and the arch pad (150) may include a refractory material such as silicone. The compression pad (140) may absorb swelling of a plurality of battery cells (130). Here, swelling may refer to an increase in volume occurring in the plurality of battery cells (130) as the plurality of battery cells (130) repeat charging and discharging cycles. In some embodiments, the compression pad (140) and the arch pad (150) may include different materials. In some embodiments, the compression pad (140) and the arch pad (150) may contain the same material.

[0067]

[0068] [Second embodiment]

[0069] FIG. 5 is a plan view of a battery pack according to one embodiment of the present disclosure. FIG. 6 is a perspective view of a battery pack according to one embodiment of the present disclosure. FIG. 7 is a cross-sectional view of the battery pack of FIG. 6 according to one embodiment of the present disclosure, cut along line B-B'.

[0070] Referring to FIGS. 5 through 7, a battery pack (10) according to an exemplary embodiment of the present disclosure may include a lower plate (200), a side plate (210) surrounding the lower plate (200), and a plurality of battery cell assemblies (100) disposed in a receiving space partitioned by the lower plate (200) and the side plate (210). FIG. 5 may show a plurality of battery cell assemblies (100) mounted in a lower case of the battery pack (10). The lower case may include a lower plate (200) and a side plate (210) surrounding the lower plate (200). That is, the lower case may form a receiving space partitioned by the lower plate (200) and the side plate (210).

[0071] In some embodiments, the plurality of battery cell assemblies (100) may include the battery cell assembly (100) of FIGS. 1 to 4. That is, the battery cell assembly (100) may include a plurality of battery cells (130) stacked in a first direction and a frame (110) accommodating the plurality of battery cells, and the frame (110) may include at least one arch-shaped side wall (111). In the following, descriptions that overlap with FIGS. 1 to 4 may be omitted.

[0072] In some embodiments, the side plate (210) may include a plurality of side plates (210_1, 210_2, 210_3, 210_4) surrounding the lower plate (200). The plurality of side plates (210_1, 210_2, 210_3, 210_4) may be coupled to the lower plate (200). The plurality of side plates (210_1, 210_2, 210_3, 210_4) may be welded to the lower plate (200). Each of the plurality of side plates (210_1, 210_2, 210_3, 210_4) may be perpendicular to the lower plate (200).

[0073] In some embodiments, cross beams (230) may be interposed between a plurality of battery cell assemblies (100). Cross beams (230) may extend in the Y direction. Cross beams (230) may be joined to a lower plate (200) by a method such as welding. Cross beams (230) may be substantially perpendicular to the lower plate (200).

[0074] In some embodiments, the battery pack (10) may further include a center beam (240) that is positioned between the plurality of battery cell assemblies (100) and extends in the first direction. The receiving space of the battery pack (10) may be arranged in a grid by the cross beams (230) and the center beam (240).

[0075] The battery pack (10) may further include electrical components. In some embodiments, the electrical components may be mounted on a lower case.

[0076] In some embodiments, the electrical components may be positioned between the side wall (111) where the exhaust devices (300) are installed and the plurality of battery cell assemblies (100). In some embodiments, the electrical components may include any electronic components necessary to drive the battery pack.

[0077] In some embodiments, the electrical components may include, for example, a battery management system (BMS). The BMS may be configured to perform monitoring, balancing, and control of the battery pack. In some embodiments, monitoring of the battery pack (10) may include measuring the voltage and current of specific nodes within a plurality of battery cell assemblies (100) and measuring the temperature of set locations within the battery pack (10). In some embodiments, the battery pack (10) may include measuring instruments for measuring the voltage, current, and temperature described above.

[0078] Balancing of the battery pack (10) is an operation that reduces the deviation in the voltage state of charge between multiple battery cell assemblies (100). Control of the battery pack (10) includes preventing the occurrence of overcharging, over-discharging, and overcurrent. Through monitoring, balancing, and control, the battery pack (10) can operate under optimal conditions, and accordingly, the shortening of the lifespan of each of the multiple battery cell assemblies (100) can be prevented or reduced.

[0079] The electrical components may further include a PRA (power relay assembly), a safety plug, etc. The PRA may be configured to supply or cut off power from a high-voltage battery to an external load (e.g., a vehicle motor). The PRA can protect a plurality of battery cell assemblies (100) and an external load (e.g., a vehicle motor) by cutting off power supply to the external load (e.g., a vehicle motor) in situations where abnormal voltage, such as a voltage surge, occurs.

[0080]

[0081] [Third Embodiment]

[0082] FIG. 8 is a perspective view of a battery cell assembly according to one embodiment of the present disclosure. FIG. 8 may be described with reference to FIG. 1 to FIG. 4 together, and redundant descriptions may be omitted.

[0083] In some embodiments, the at least one arch-shaped side wall (111) may include at least one through hole. In some embodiments, the at least one through hole may include four through holes (116_1, 116_2, 116_3, 116_4). The four through holes (116_1, 116_2, 116_3, 116_4) may include a first upper hole (116_1), a second upper hole (116_2), a first lower hole (116_4), and a second lower hole (116_3). The spaces that the at least one arch-shaped side wall (111) described in FIGS. 1 to 5 may include (e.g., a first upper space (112_1), etc.) may be spaces inside the side wall that are isolated from the outside of the side wall (111). In contrast, the at least one through hole including the at least one arch-shaped side wall (111) can be a hole through which fluid flowing from the outside can flow.

[0084] The first upper hole (116_1) and the first lower hole (116_4) may be symmetrical with respect to the horizontal plane of the midpoint height of the vertical length of at least one arch-shaped side wall (111), and the second upper hole (116_2) and the second lower hole (116_3) may be symmetrical.

[0085] According to an exemplary embodiment of the present disclosure, the at least one arch-shaped side wall (111) of the battery cell assembly (100) includes at least one through hole so that the coolant (160) can flow inside the at least one arch-shaped side wall (111) of the battery cell assembly (100) without being stagnant.

[0086]

[0087] [Fourth embodiment]

[0088] FIG. 9 is a plan view of a battery pack according to one embodiment of the present disclosure. FIG. 9 may be described with reference to FIG. 1 to FIG. 8 together, and redundant descriptions may be omitted.

[0089] Referring to FIG. 9, a battery pack (10) according to an exemplary embodiment of the present disclosure may include a lower plate (200), a side plate (210) surrounding the lower plate (200), and a plurality of battery cell assemblies (100) disposed in a receiving space partitioned by the lower plate (200) and the side plate (210).

[0090] In some embodiments, the plurality of battery cell assemblies (100) may include the battery cell assembly (100) of FIG. 8. That is, the battery cell assembly (100) may include a plurality of battery cells (130) stacked in a first direction and a frame (110) accommodating the plurality of battery cells, and the frame (110) may include at least one arch-shaped side wall (111). Descriptions that overlap with FIG. 8 may be omitted.

[0091] In some embodiments, the side plate (210) may have first hollow passages (401) extending in the first direction and second hollow passages (402) extending in a second direction (Y direction) perpendicular to the first direction (X direction).

[0092] In some specific embodiments, the side plates (210_1, 210_3) may each have a first hollow passage (401) and a second hollow passage (402) extending toward the battery cell assembly (100). In some embodiments, the first hollow passage (401) may be connected to the second hollow passage (402), and the second hollow passage (402) may be connected to the at least one through hole. In some embodiments, the first hollow passage (401) may be fluidly connected to the second hollow passage (402), and the second hollow passage (402) may be fluidly connected to the at least one through hole.

[0093] The lower case of the battery pack (10) may further include a center beam (240) that is positioned between a plurality of battery cell assemblies (100) and extends in a first direction (X direction). The center beam (240) may have third hollow passages (403) extending in the second direction. In some embodiments, the third hollow passages (403) may each be connected to a through hole of the battery cell assembly (100) that abuts the center beam (240). In some embodiments, the third hollow passages (403) may each be fluidly connected to a through hole of the battery cell assembly (100) that abuts the center beam (240).

[0094] According to an exemplary embodiment of the present disclosure, the side plate (210) of the lower case of the battery pack (10) includes the first hollow passages (401) and the second hollow passages (402) so as to receive a coolant (160) from outside the battery pack (10) and discharge the coolant (160) to outside the battery pack (10).

[0095] Additionally, the side plate (210) of the lower case of the battery pack (10) according to an exemplary embodiment of the present disclosure may include the first hollow passages (401) and the second hollow passages (402) to allow a coolant (160) supplied from the outside to flow through at least one through hole of the at least one arch-shaped side wall (111) of the battery cell assembly (100).

[0096]

[0097] [Fifth embodiment]

[0098] FIG. 10 is a plan view of a battery pack according to one embodiment of the present disclosure. FIG. 10 may be described with reference to FIG. 1 to FIG. 9, and redundant descriptions may be omitted.

[0099] Referring to FIG. 10, a battery pack (10) according to an exemplary embodiment of the present disclosure may include a lower plate (200), a side plate (210) surrounding the lower plate (200), and a plurality of battery cell assemblies (100) disposed in a receiving space partitioned by the lower plate (200) and the side plate (210).

[0100] In some embodiments, the plurality of battery cell assemblies (100) may include the battery cell assembly (100) of FIG. 8. That is, the battery cell assembly (100) may include a plurality of battery cells (130) stacked in a first direction and a frame (110) accommodating the plurality of battery cells, and the frame (110) may include at least one arch-shaped side wall (111). Descriptions that overlap with FIG. 8 and FIG. 9 may be omitted.

[0101] In some embodiments, the center beam (240) may have a third hollow passage (403) extending in the second direction and a center hollow passage (404) extending in the first direction. The third hollow passage (403) may be connected to the center hollow passage (404). The third hollow passage (403) may be fluidly connected to the center hollow passage (404). The third hollow passage may be connected to the at least one through hole. The third hollow passage may be fluidly connected to the at least one through hole.

[0102] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

Claims

1. A plurality of battery cells stacked in a first direction; and It includes a frame that accommodates the plurality of battery cells mentioned above, and The above frame is, A battery cell assembly characterized by including at least one arch-shaped side wall.

2. In Paragraph 1, A battery cell assembly characterized in that the above arch shape is a concave arch shape toward the plurality of battery cells.

3. In Paragraph 1, The above-mentioned at least one arch-shaped side wall is, A battery cell assembly characterized by having an outer surface in the shape of the arch described above.

4. In Paragraph 1, The above-mentioned at least one arch-shaped side wall is, It includes two arch-shaped side walls, A battery cell assembly characterized in that the two arch-shaped side walls are spaced apart from each other in the first direction.

5. In Paragraph 4, A battery cell assembly characterized by having a compression pad disposed between each of the two arch-shaped side walls and the plurality of battery cells.

6. In Paragraph 1, A battery cell assembly characterized in that the above-mentioned at least one arch-shaped side wall includes at least one empty space inside.

7. In Paragraph 6, The above at least one empty space is, It includes 4 empty spaces, The above four empty spaces include a first upper space, a second upper space, a first lower space, and a second lower space, and A battery cell assembly characterized in that the first upper space and the first lower space are symmetrical with respect to the horizontal plane of the midpoint height of the vertical length of at least one arch-shaped side wall, and the second upper space and the second lower space are symmetrical.

8. In Paragraph 6, A battery cell assembly characterized in that at least one empty space is filled with a coolant.

9. In Paragraph 1, A battery cell assembly characterized in that the concave portion of at least one arch-shaped side wall includes an arch pad.

10. In Paragraph 1, A battery cell assembly characterized in that the above-mentioned at least one arch-shaped side wall includes at least one through hole.

11. In Paragraph 10, The above at least one through hole is, It includes 4 through holes, and The above four through holes include a first upper hole, a second upper hole, a first lower hole, and a second lower hole, and A battery cell assembly characterized in that the first upper hole and the first lower hole are symmetrical with respect to the horizontal plane of the midpoint height of the vertical length of at least one arch-shaped side wall, and the second upper hole and the second lower hole are symmetrical.

12. Lower plate; Side plates surrounding the lower plate; and A plurality of battery cell assemblies disposed in a receiving space partitioned by the lower plate and the side plate; comprising The above plurality of battery cell assemblies are, A plurality of battery cells stacked in a first direction; and It includes a frame that accommodates the plurality of battery cells mentioned above, and The above frame is, A battery pack characterized by including at least one arch-shaped side wall.

13. In Paragraph 12, The above arch shape is a concave arch shape toward the plurality of battery cells, and A battery pack characterized in that the outer surface of at least one arch-shaped side wall is in the shape of the arch.

14. In Paragraph 12, The above-mentioned at least one arch-shaped side wall is, It includes two arch-shaped side walls, A battery pack characterized in that the two arch-shaped side walls are spaced apart from each other in the first direction.

15. In Paragraph 14, A battery pack characterized by having a compression pad disposed between each of the two arch-shaped side walls and the plurality of battery cells.

16. In Paragraph 12, A battery pack characterized in that at least one arch-shaped side wall includes at least one empty space inside.

17. In Paragraph 16, The above at least one empty space is, It includes 4 empty spaces, The above four empty spaces include a first upper space, a second upper space, a first lower space, and a second lower space, and A battery pack characterized in that the first upper space and the first lower space are symmetrical with respect to the horizontal plane of the midpoint height of the vertical length of at least one arch-shaped side wall, and the second upper space and the second lower space are symmetrical.

18. In Paragraph 16, A battery pack characterized in that at least one empty space is at least partially filled with a coolant.

19. In Paragraph 13, A battery pack characterized in that the concave portion of the side wall of at least one arch shape includes an arch pad.

20. In Paragraph 12, A battery pack characterized in that the above-mentioned at least one arch-shaped side wall includes at least one through hole.

21. In Paragraph 20, The above side plate has first hollow passages extending in the first direction and second hollow passages extending in a second direction perpendicular to the first direction, and A battery pack characterized in that the first hollow passages are connected to the second hollow passages, and the second hollow passages are connected to the at least one through hole.

22. In Paragraph 21, It further includes a center beam disposed between the plurality of battery cell assemblies and extending in the first direction, The center beam has, inside, third hollow passages extending in the second direction and a center hollow passage extending in the first direction, and The above third hollow passages are connected to the above center hollow passage, and A battery pack characterized in that the above-mentioned third hollow passages are connected to the above-mentioned at least one through hole.

23. In Paragraph 20, The above at least one through hole is, It includes 4 through holes, and The above four through holes include a first upper hole, a second upper hole, a first lower hole, and a second lower hole, and A battery pack characterized in that the first upper hole and the first lower hole are symmetrical with respect to the horizontal plane of the midpoint height of the vertical length of the at least one arch-shaped side wall, and the second upper hole and the second lower hole are symmetrical.

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