Battery pack

Abstract

According to exemplary embodiments of the present invention, a battery pack may be provided. The battery pack comprises: a pack housing; and a first battery cell assembly and a second battery cell assembly accommodated in the pack housing. The first battery cell assembly may include one or more first cooling plates and one or more second cooling plates. The second battery cell assembly may include one or more first cooling plates and one or more second cooling plates. The number of the one or more first cooling plates included in the first battery cell assembly may be different from the number of the one or more first cooling plates included in the second battery cell assembly. Each of the one or more first cooling plates may include a flow path through which a coolant flows. The coolant may flow while undergoing a phase change between a gaseous state and a liquid state.

Description

battery pack

[0001] The present invention relates to a battery pack. Specifically, the present invention relates to a battery pack comprising a cooling plate.

[0002] This application claims the benefit of Korean application No. 10-2025-0013192, filed on February 3, 2025, which is incorporated herein by reference in its entirety.

[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 rechargeable batteries for mobility is the improvement of energy density and safety. The safety of rechargeable batteries is critical as it is directly linked to the lives of passengers. The safety of rechargeable 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 problem that the technical concept of the present invention aims to solve is to provide a battery pack with enhanced safety.

[0006] The problem that the technical concept of the present invention aims to solve is to provide a battery pack with improved performance and reliability.

[0007] The problem that the technical concept of the present invention aims to solve is to provide a battery pack with reduced weight.

[0008] According to exemplary embodiments of the present invention for solving the above-described problem, a battery pack may be provided. The battery pack comprises: a pack housing; and a first battery cell assembly and a second battery cell assembly accommodated in the pack housing, wherein the first battery cell assembly comprises one or more first cooling plates and one or more second cooling plates, and the second battery cell assembly comprises one or more first cooling plates and one or more second cooling plates, wherein the number of the one or more first cooling plates included in the first battery cell assembly is different from the number of the one or more first cooling plates included in the second battery cell assembly, and each of the one or more first cooling plates comprises a flow path through which a cooling material flows, and the cooling material may flow while undergoing a phase change between a gaseous state and a liquid state.

[0009] In one embodiment, the number of one or more second cooling plates included in the first battery cell assembly is different from the number of one or more second cooling plates included in the second battery cell assembly, and the one or more second cooling plates may not include a flow path through which the cooling material flows.

[0010] In one embodiment, the Euro may include one or more circulation channels.

[0011] In one embodiment, the Euro may be an engraved pattern.

[0012] In one embodiment, each of the one or more first cooling plates and the one or more second cooling plates included in the first battery cell assembly absorbs heat from adjacent first battery cells within the first battery cell assembly, and the amount of heat absorbed per hour by each of the one or more first cooling plates may be different from the amount of heat absorbed per hour by each of the one or more second cooling plates.

[0013] In one embodiment, each of the one or more first cooling plates and the one or more second cooling plates included in the second battery cell assembly absorbs heat from adjacent second battery cells within the second battery cell assembly, and the sum of the heat absorption amounts per hour of the one or more first cooling plates and the one or more second cooling plates within the first battery cell assembly may differ from the sum of the heat absorption amounts per hour of the one or more first cooling plates and the one or more second cooling plates within the second battery cell assembly.

[0014] In one embodiment, the first battery cell assembly comprises a first case, a plurality of first battery cells on a bottom portion of the first case, and a lower heat absorption layer between the plurality of first battery cells and the bottom portion, and each of the one or more first cooling plates and the one or more second cooling plates included in the first battery cell assembly may be in contact with the lower heat absorption layer.

[0015] In one embodiment, the first battery cell assembly further includes an upper heat absorption layer on top of the plurality of first battery cells, and each of the one or more first cooling plates and the one or more second cooling plates included in the first battery cell assembly can come into contact with the upper heat absorption layer.

[0016] In one embodiment, the first battery cell assembly includes a plurality of first battery cells arranged in a first direction, and each of the first cooling plates includes a body portion that overlaps the plurality of first battery cells in the first direction and a bend portion that protrudes from the body portion in the first direction toward the upper portion of the plurality of first battery cells, and the flow path may form a single circulation flow path in the body portion and the bend portion.

[0017] In one embodiment, the first battery cell assembly includes a plurality of first battery cells arranged in a first direction, and the first battery cell assembly and the second battery cell assembly may be arranged in the first direction.

[0018] In one embodiment, the first battery cell assembly includes a plurality of first battery cells arranged in a first direction, and the first battery cell assembly and the second battery cell assembly may be arranged in a second direction intersecting the first direction.

[0019] According to exemplary embodiments of the present invention for solving the above-described problem, a battery pack may be provided. The battery pack comprises: a pack housing; and a first battery cell assembly and a second battery cell assembly accommodated in the pack housing, wherein the first battery cell assembly comprises one or more first cooling plates, and the second battery cell assembly comprises one or more first cooling plates and one or more second cooling plates, wherein the number of the one or more first cooling plates included in the first battery cell assembly is different from the number of the one or more first cooling plates included in the second battery cell assembly, and the first battery cell assembly does not include the second cooling plate, and each of the one or more first cooling plates includes a flow path through which a cooling material flows, and the second cooling plate does not include a flow path through which the cooling material flows, and the cooling material may flow while undergoing a phase change between a gaseous state and a liquid state.

[0020] According to exemplary embodiments of the present invention for solving the above-described problem, a battery pack may be provided. The battery pack comprises: a pack housing; and a first battery cell assembly and a second battery cell assembly accommodated in the pack housing, wherein the first battery cell assembly comprises one or more first cooling plates and one or more second cooling plates, the second battery cell assembly comprises one or more of the second cooling plates, and the second battery cell assembly does not comprise the first cooling plate, the number of the one or more second cooling plates included in the first battery cell assembly is different from the number of the one or more second cooling plates included in the second battery cell assembly, each of the one or more first cooling plates comprises a flow path through which a cooling material flows, and the second cooling plate does not comprise a flow path through which the cooling material flows, and the cooling material may flow while undergoing a phase change between a gaseous state and a liquid state.

[0021] According to exemplary embodiments of the present invention, the temperature difference between battery cell assemblies within a battery pack can be reduced.

[0022] According to exemplary embodiments of the present invention, a battery pack with enhanced safety can be provided.

[0023] According to exemplary embodiments of the present invention, a battery pack with improved performance and reliability can be provided.

[0024] According to exemplary embodiments of the present invention, a battery pack with reduced weight can be provided.

[0025] The effects obtainable from the exemplary embodiments of the present invention are not limited to those mentioned above, and other unmentioned effects can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure belong from the following description. That is, unintended effects resulting from the implementation of the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0026] FIG. 1 is a drawing showing a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0027] FIG. 2 is a drawing showing a first battery cell assembly to explain a battery pack according to exemplary embodiments of the technical concept of the present invention.

[0028] FIG. 3 is a drawing showing a second battery cell assembly to explain a battery pack according to exemplary embodiments of the technical concept of the present invention.

[0029] FIG. 4 is a cross-sectional view of a first cooling plate to illustrate a battery pack according to exemplary embodiments of the technical concept of the present invention.

[0030] FIG. 5 is an exploded perspective view of a battery cell to illustrate a battery pack according to exemplary embodiments of the technical concept of the present invention.

[0031] FIG. 6 is a drawing showing a first battery cell assembly to explain a battery pack according to exemplary embodiments of the technical concept of the present invention.

[0032] FIG. 7 is a drawing showing a first battery cell assembly to explain a battery pack according to exemplary embodiments of the technical concept of the present invention.

[0033] FIG. 8 is a drawing showing a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0034] FIG. 9 is a drawing showing a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0035] FIG. 10 is a drawing showing a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0036] FIG. 11 is a drawing showing a third battery cell assembly to explain a battery pack according to exemplary embodiments of the technical concept of the present invention.

[0037] FIG. 12 is a drawing showing a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0038] FIG. 13 is a drawing showing a fourth battery cell assembly to explain a battery pack according to exemplary embodiments of the technical concept of the present invention.

[0039] FIG. 14 is a drawing showing a battery pack according to exemplary embodiments based on the technical concept of the present invention.

[0040] 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. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0041] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0042] In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted.

[0043] Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, 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.

[0044]

[0045] (1st embodiment)

[0046] FIG. 1 is a drawing showing a battery pack (100) according to exemplary embodiments based on the technical concept of the present invention.

[0047] FIG. 2 is a drawing showing a first battery cell assembly (120A) to explain a battery pack (100) according to exemplary embodiments of the technical concept of the present invention.

[0048] FIG. 3 is a drawing showing a second battery cell assembly (120B) to explain a battery pack (100) according to exemplary embodiments of the technical concept of the present invention.

[0049] FIG. 4 is a cross-sectional view of a first cooling plate (141) for illustrating a battery pack (100) according to exemplary embodiments of the technical concept of the present invention.

[0050] FIG. 5 is an exploded perspective view of a battery cell (121) to explain a battery pack (100) according to exemplary embodiments of the technical concept of the present invention.

[0051]

[0052] Referring to FIG. 1, the battery pack (100) may include a pack housing (110) and a plurality of battery cell assemblies (120). The battery pack (100) may be a final product mounted in an application such as a vehicle. For example, the battery pack (100) may have a cell-to-pack structure.

[0053] The pack housing (110) may provide a space for mounting battery cell assemblies (120). The pack housing (110) may include a base plate (111), side walls (112, 113, 114, 115), a center beam (116), and cross beams (117).

[0054] Here, the first direction (D1) and the second direction (D2) may be substantially parallel to the mounting surface of the base plate (111) (i.e., the surface facing the battery cell assembly (120)), and the third direction (D3) may be substantially perpendicular to the mounting surface of the base plate (111).

[0055] Each of the base plate (111) and the side walls (112, 113) can be provided by an extrusion process. The extrusion direction of each of the base plate (111) and the side walls (112, 113) can be a first direction (D1). The side walls (114, 115) can also be provided by an extrusion process. The side walls (112, 113, 114, 115) can be substantially perpendicular to the base plate (111).

[0056] According to exemplary embodiments, the base plate (111) and side walls (112, 113) may be joined by friction stir welding. The base plate (111) may include a plurality of unit plates joined by friction stir welding.

[0057] The center beam (116) may extend in a first direction (D1). The center beam (116) may be interposed between the side walls (112, 113). The center beam (116) may be included in a center plate, which is one of a plurality of unit plates friction-stir welded together. Accordingly, the center beam (116) may be formed together with the center plate, and the center beam (116) may be a continuous element integrally with the center plate. The cross beams (117) may extend in a second direction (D2). The cross beams (117) may be interposed between the side walls (114, 115).

[0058] The base plate (111) may include a plurality of cooling channels. The plurality of cooling channels may provide a passage for the movement of a refrigerant, such as water. The plurality of cooling channels may be formed by an extrusion process. The plurality of cooling channels may extend in a first direction (D1). The plurality of cooling channels may be spaced apart in a second direction (D2).

[0059] A plurality of battery cell assemblies (120) may be placed on a base plate (111) of a pack housing (110). The base plate (111) may support the plurality of battery cell assemblies (120). Side walls (112, 113, 114, 115) may horizontally surround the plurality of battery cell assemblies (120). The side walls (112, 113, 114, 115) may protect the plurality of battery cell assemblies (120). The plurality of battery cell assemblies (120) may be placed on the base plate (111) in a space defined by cross beams (117).

[0060] A plurality of battery cell assemblies (120) may include a first battery cell assembly (120A) and a second battery cell assembly (120B). For example, the first battery cell assembly (120A) and the second battery cell assembly (120B) may be arranged in a first direction (D1).

[0061] The battery pack (100) may further include a pack lead that is coupled to the side walls (112, 113, 114, 115) of the pack housing (110). The pack lead may cover elements mounted inside the battery pack (100), such as a plurality of battery cell assemblies (120) and electrical components. The pack lead may be secured to the pack housing (110) by mechanical coupling means, such as bolting.

[0062] In FIG. 1, the arrangement of multiple battery cell assemblies (120) can be described as a 3 * 2 arrangement. The arrangement of multiple battery cell assemblies (120) disclosed in FIG. 1 is a non-limiting example and does not limit the technical concept of the present invention in any sense. A person skilled in the art will be able to easily arrive at a plurality of battery cell assemblies (120) arranged in an M * N arrangement (where M and N are each integers greater than or equal to 2) based on what is described herein.

[0063] The battery pack (100) may further include a Battery Management System (BMS). The BMS may be configured to perform monitoring, balancing, and control of the battery pack (100). Monitoring of the battery pack (100) may include measuring the voltage and current of specific nodes within a plurality of battery cell assemblies (120) and measuring the temperature of set locations within the battery pack (100). The battery pack (100) may include measuring instruments for measuring the voltage, current, and temperature described above.

[0064] Balancing of the battery pack (100) is an operation that reduces deviations between multiple battery cell assemblies (120). Control of the battery pack (100) includes preventing overcharging, over-discharging, and overcurrent. Through monitoring, balancing, and control, the battery pack (100) can operate under optimal conditions, and accordingly, the shortening of the lifespan of each of the multiple battery cell assemblies (120) can be prevented.

[0065] The battery pack (100) may further include additional electrical components such as a cooling device, a Power Relay Assembly (PRA), and a safety plug. The cooling device may include a cooling fan. The cooling fan can prevent overheating of each of the multiple battery cell assemblies (120) by circulating air inside the battery pack (100). The PRA may be configured to supply or cut off power from the high-voltage battery to an external load (e.g., a vehicle motor). The PRA can protect the multiple battery cell assemblies (120) and the 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. Additional electrical components may be interposed between the multiple battery cell assemblies (120) and the side wall (115). The space between the battery cell assemblies (120) and the side wall (115) may be referred to as an electrical component mounting area.

[0066] The battery pack (100) may further include a plurality of interbusbars configured to electrically connect a plurality of battery cell assemblies (120). The plurality of battery cell assemblies (120) may be connected in series by the plurality of interbusbars. Accordingly, the battery pack (100) may be configured to output a high voltage to an external load (e.g., a motor of a vehicle).

[0067]

[0068] Referring to FIGS. 2 to 4 together, each of the first battery cell assembly (120A) and the second battery cell assembly (120B) may include a plurality of battery cells, one or more first cooling plates (141), one or more second cooling plates (142), and a lower heat absorption layer (131).

[0069] As illustrated in FIG. 1, within the battery pack (100), a first battery cell assembly (120A) and a second battery cell assembly (120B) may be arranged in a first direction (D1). Within each of the first battery cell assembly (120A) and the second battery cell assembly (120B), a plurality of battery cells may be arranged in the first direction (D1). The plurality of battery cells may be joined, for example, by an adhesive.

[0070] As illustrated in FIG. 2, the first battery cell assembly (120A) may include a plurality of first battery cells (121A) arranged in a first direction (D1). A lower heat absorption layer (131) may be disposed below the plurality of first battery cells (121A). The lower heat absorption layer (131) may overlap the plurality of first battery cells (121A) in a third direction (D3). The lower heat absorption layer (131) may come into contact with the plurality of first battery cells (121A). For example, the lower heat absorption layer (131) may include a thermal resin, a thermal interface material (TIM), or a gap filler.

[0071] In the embodiments, the first battery cell assembly (120A) may include one or more first cooling plates (141) and one or more second cooling plates (142). Each of the one or more first cooling plates (141) and one or more second cooling plates (142) may be disposed between a plurality of first battery cells (121A). Each of the one or more first cooling plates (141) and one or more second cooling plates (142) may be in contact with each of the plurality of first battery cells (121A). Each of the one or more first cooling plates (141) and one or more second cooling plates (142) may be in contact with the lower heat absorption layer (131).

[0072] For example, each of one or more first cooling plates (141) may be positioned between each of some battery cells located in the central part of a plurality of first battery cells (121A), and each of one or more second cooling plates (142) may be positioned between each of some battery cells located in the peripheral part of the first battery cells (121A). However, the technical concept of the present invention is not limited thereto. For example, the number and arrangement of each of one or more first cooling plates (141) and one or more second cooling plates (142) may differ from those exemplified.

[0073] In the embodiments, the first cooling plate (141) includes a channel through which a cooling material flows, and the second cooling plate (142) may not include a channel through which a cooling material flows.

[0074] As illustrated in FIG. 4, the first cooling plate (141) may include a plate (141P) and a channel (141R). The channel (141R) may be disposed inside the plate (141P). A cooling material (141C) may flow within the channel (141R).

[0075] Specifically, the cooling material (141C) is filled into the flow path (141R) and can flow while undergoing a phase change between a liquid state (141C_l) and a gaseous state (141C_g). For example, the cooling material (141C) can vibrate due to a pressure difference caused by condensation and evaporation, and the cooling material (141C) can flow due to this vibration and cool the battery cell.

[0076] The plate (141P) may include a material with high thermal conductivity. For example, the plate (141P) may include aluminum. The channel (141R) may be an engraved pattern inside the plate (141P). The channel (141R) may be an engraved pattern formed inside the plate (141P). Specifically, a portion of the plate (141P) may be etched to form the channel (141R), and a cooling material (141C) may be filled into the etched space. For example, the first cooling plate (141) may be an aluminum plate containing an etched pattern inside.

[0077] The flow path (141R) can form a single circulation path within the plate (141P). The flow path (141R) is a closed circulation path, and within the flow path (141R), the cooling material (141C) can undergo repeated phase changes and flow and circulate due to vibrations caused by this.

[0078] In embodiments, the first cooling plate (141) can absorb heat generated from a plurality of adjacent first battery cells (121A). Specifically, the heat is transferred to the first cooling plate (141), and the heat can be transferred to the lower heat absorption layer (131) by the flow of a cooling material (141C) within the flow path (141R). The heat transferred to the lower heat absorption layer (131) can be cooled, and the first cooling plate (141) can continuously absorb heat generated from the adjacent first battery cells (121A). In some embodiments, the lower heat absorption layer (131) can transfer the heat to a separately provided heat sink.

[0079] For example, the second cooling plate (142) can absorb heat generated from the adjacent first battery cell (121A). Unlike the first cooling plate (141), the second cooling plate (142) may not include a channel through which a cooling material flows. The second cooling plate (142) may include a material with high thermal conductivity, for example, aluminum. For example, the second cooling plate (142) may be an aluminum plate that does not include an etching pattern inside. The second cooling plate (142) can transfer the heat to the lower heat absorption layer (131).

[0080] For example, the first cooling plate (141) may include a channel that is an engraved pattern, and thus may have a reduced weight compared to the second cooling plate (142).

[0081] In the embodiments, the first cooling plate (141) and the second cooling plate (142) may have different heat absorption rates per hour. For example, the first cooling plate (141) and the second cooling plate (142) may have different heat absorption rates per hour due to differences in whether or not they include a channel through which a cooling material flows. For example, the heat absorption rate per hour of the first cooling plate (141) may be greater than the heat absorption rate per hour of the second cooling plate (142).

[0082] As illustrated in FIG. 3, the second battery cell assembly (120B) may include a plurality of second battery cells (121B) arranged in a first direction (D1). A lower heat absorption layer (131) may be disposed below the plurality of second battery cells (121B). The lower heat absorption layer (131) may overlap the plurality of second battery cells (121B) in a third direction (D3). The lower heat absorption layer (131) may come into contact with the plurality of second battery cells (121B). For example, the lower heat absorption layer (131) may include a thermal resin, a thermal interface material (TIM), or a gap filler.

[0083] In the embodiments, the second battery cell assembly (120B) may include one or more first cooling plates (141) and one or more second cooling plates (142). Each of the one or more first cooling plates (141) and one or more second cooling plates (142) may be disposed between a plurality of second battery cells (121B). Each of the one or more first cooling plates (141) and one or more second cooling plates (142) may be in contact with each of the plurality of second battery cells (121B). Each of the one or more first cooling plates (141) and one or more second cooling plates (142) may be in contact with the lower heat absorption layer (131). For a description of the first cooling plate (141) and the second cooling plate (142), refer to the foregoing description.

[0084] In the embodiments, each of one or more first cooling plates (141) and one or more second cooling plates (142) within the second battery cell assembly (120B) can absorb heat generated from the adjacent second battery cell (121B). The first cooling plate (141) and the second cooling plate (142) can transfer the heat to the lower heat absorption layer (131).

[0085]

[0086] In the embodiments, the number of one or more first cooling plates (141) included in the first battery cell assembly (120A) may differ from the number of one or more first cooling plates (141) included in the second battery cell assembly (120B). For example, the number of one or more first cooling plates (141) included in the first battery cell assembly (120A) may be greater than the number of one or more first cooling plates (141) included in the second battery cell assembly (120B). For example, the first battery cell assembly (120A) may include seven first cooling plates (141), and the second battery cell assembly (120B) may include three first cooling plates (141). However, the number of first cooling plates (141) included in each of the first battery cell assembly (120A) and the second battery cell assembly (120B) is exemplary and is not limited to what is illustrated.

[0087] In the embodiments, the number of one or more second cooling plates (142) included in the first battery cell assembly (120A) may differ from the number of one or more second cooling plates (142) included in the second battery cell assembly (120B). For example, the number of one or more second cooling plates (142) included in the first battery cell assembly (120A) may be greater than the number of one or more second cooling plates (142) included in the second battery cell assembly (120B). For example, the first battery cell assembly (120A) may include four second cooling plates (142), and the second battery cell assembly (120B) may include eight second cooling plates (142). However, the number of second cooling plates (142) included in each of the first battery cell assembly (120A) and the second battery cell assembly (120B) is exemplary and is not limited to what is illustrated.

[0088] As described above, the first cooling plate (141) and the second cooling plate (142) may have different heat absorption amounts per hour. Accordingly, the sum of the heat absorption amounts per hour of the first cooling plate (141) and the second cooling plate (142) within the first battery cell assembly (120A) may be different from the sum of the heat absorption amounts per hour of the first cooling plate (141) and the second cooling plate (142) within the second battery cell assembly (120B).

[0089] For example, when comparing the first battery cell assembly (120A) with the second battery cell assembly (120B), the first battery cell assembly (120A) may contain more of the first cooling plate (141), which has a relatively large amount of heat absorption per hour. Accordingly, the sum of the heat absorption per hour of the first cooling plate (141) and the second cooling plate (142) within the first battery cell assembly (120A) may be greater than the sum of the heat absorption per hour of the first cooling plate (141) and the second cooling plate (142) within the second battery cell assembly (120B).

[0090] In other words, the battery pack (100) may include a first battery cell assembly (120A) and a second battery cell assembly (120B) arranged in a first direction (D1), having different sums of heat absorption amounts per hour.

[0091]

[0092] Referring together with FIG. 5, the battery cell (121) may include a case (121C), an electrode assembly (121EA), a positive terminal (121P), and a negative terminal (121N). The battery cell (121) may further include an electrolyte. The battery cell (121) may refer to each of the plurality of first battery cells (121A) of FIG. 2 and each of the plurality of second battery cells (121B) of FIG. 3.

[0093] According to exemplary embodiments, the battery cell (121) may include 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 comprising an aluminum laminate sheet. Hereinafter, the technical concept of the present invention is described based on an example in which the battery cell (121) includes a pouch-type battery cell, but a person skilled in the art will be able to easily arrive at an example in which the battery cell (121) includes one of a cylindrical battery cell and a prismatic battery cell based on what is described herein.

[0094] The electrode assembly (121EA) may include an anode, a cathode, and a separator interposed between the anode and the cathode. The electrode assembly (121EA) may be either a jelly-roll type or a stack type. A jelly-roll type electrode assembly (121EA) may include a wound structure of an anode, a cathode, and a separator interposed between them. A stack type electrode assembly (121EA) may include a plurality of anodes, a plurality of cathodes, and a plurality of separators interposed between them that are sequentially stacked.

[0095] In a stack-type electrode assembly (121EA), a plurality of positive electrodes and a plurality of negative electrodes may be arranged in a first direction (D1). In a stack-type electrode assembly (121EA), a plurality of positive electrodes and a plurality of negative electrodes may be stacked in a first direction (D1).

[0096] Each of the plurality of positives of the electrode assembly (121EA) may include a positive tab (not shown). Each positive tab (not shown) of the plurality of positives of the electrode assembly (121EA) may be short-circuited with a positive terminal (121P). Each positive tab (not shown) of the plurality of positives of the electrode assembly (121EA) may be welded with a positive terminal (121P).

[0097] Each of the plurality of cathodes of the electrode assembly (121EA) may include a cathode tab (121NT). Each of the cathode tabs (121NT) of the plurality of cathodes of the electrode assembly (121EA) may be short-circuited with a cathode terminal (121N). Each of the cathode tabs (121NT) of the plurality of cathodes of the electrode assembly (121EA) may be welded with a cathode terminal (121N).

[0098] The case (121C) may include an inner resin layer, a metal layer, and an outer resin layer. An adhesive and an anti-corrosion layer may be further provided between the inner resin layer and the metal layer and between the outer resin layer and the metal layer.

[0099] The inner resin layer may have heat-sealability and may be referred to as a sealant layer. The inner resin layer enables sealing of the case (121C). The inner resin layer may include polyolefin-based resins such as polypropylene (PP) and polyethylene (PE), for example. The metal layer may include any one of an alloy of iron, carbon, chromium, and manganese, an alloy of iron, chromium, and nickel, and aluminum. The metal layer may be a gas barrier. The metal layer may block the entry and exit of gas through the case (121C). The outer resin layer may be a surface protection layer. The outer resin layer may include a material having wear resistance and heat resistance, such as nylon resin.

[0100] The case (121C) may be provided by joining the first case (121C1) and the second case (121C2). In this example, the first case (121C1) may be substantially flat. The first case (121C1) may not include a receiving portion. The second case (121C2) may include a receiving portion (121R). The receiving portion (121R) may be formed by a pouch forming process. The receiving portion (121R) is a part of the second case (121C2) formed into a bowl shape for receiving an electrode assembly (121EA).

[0101] The terrace (121T) of the second case (121C2) can surround the receiving portion (121R). The terrace (121T) of the second case (121C2) can be joined to the edge of the first case (121C1), and accordingly, a case (121C) can be provided.

[0102] An insulating tape (121I) may be applied to the positive terminal (121P) and the negative terminal (121N). The positive terminal (121P) and the negative terminal (121N) may protrude outside the case (121C). The positive terminal (121P) and the negative terminal (121N) may protrude from the case (121C) in a second direction (D2). Accordingly, the resulting voltage and current of the battery cell (121) may be output through the positive terminal (121P) and the negative terminal (121N). The positive terminal (121P) may be a positive lead. The negative terminal (121N) may be a negative lead.

[0103] The positive terminal (121P) and the negative terminal (121N) may be spaced apart in a second direction (D2). The second direction (D2) may be substantially parallel to each of the plurality of positives of the electrode assembly (121EA) and each of the plurality of negatives of the electrode assembly (121EA).

[0104]

[0105] According to exemplary embodiments of the technical concept of the present invention described with reference to FIGS. 1 to 5, a battery pack (100) may include a first battery cell assembly (120A) and a second battery cell assembly (120B) that together include a first cooling plate (141) and a second cooling plate (142). Specifically, the sum of the heat absorption amounts per hour of the first cooling plate (141) and the second cooling plate (142) within the first battery cell assembly (120A) may differ from the sum of the heat absorption amounts per hour of the first cooling plate (141) and the second cooling plate (142) within the second battery cell assembly (120B).

[0106] Due to differences in position within the battery pack (100), there may be a difference in the amount of heat generated by each of the first battery cell assembly (120A) and the second battery cell assembly (120B), and thus there may be a difference in the amount of heat absorbed per hour by the cooling plate required by the first battery cell assembly (120A) and the second battery cell assembly (120B).

[0107] That is, according to exemplary embodiments based on the technical concept of the present invention, the temperature difference between the first battery cell assembly (120A) and the second battery cell assembly (120B) arranged in a first direction (D1) within the battery pack (100) can be reduced. Additionally, the total weight of the battery pack (100) can be reduced by using a first cooling plate (141) that has reduced weight compared to the second cooling plate (142).

[0108]

[0109] FIG. 6 is a drawing showing a first battery cell assembly (120A_1) to explain a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, the first battery cell assembly (120A_1) of FIG. 6 is another embodiment of the first battery cell assembly (120A) of FIG. 2, and will be described below mainly in terms of the differences.

[0110] Referring to FIG. 6, the first battery cell assembly (120A_1) may include a plurality of first battery cells (121A), one or more first cooling plates (141F), one or more second cooling plates (142F), and a lower heat absorption layer (131).

[0111] In the embodiments, the first cooling plate (141F) may include a body portion (141_1) and a bend portion (141_2). The body portion (141_1) may be positioned between each of the first battery cells (121A). The body portion (141_1) may overlap with the first battery cell (121A) in a first direction (D1). The bend portion (141_2) may protrude from the body portion (141_1) in a first direction (D1) toward the top of each of the first battery cells (121A). The bend portion (141_2) may overlap with each of the first battery cells (121A) in a third direction (D3).

[0112] In the embodiments, the first cooling plate (141F) may include a channel through which a cooling material flows, and the channel may form a single circulation channel connected within the body portion (141_1) and the bend portion (141_2).

[0113] In the embodiments, the second cooling plate (142F) may include a body portion (142_1) and a bend portion (142_2). The body portion (142_1) may overlap with the first battery cell (121A) in a first direction (D1). The bend portion (142_2) may protrude from the body portion (142_1) in a first direction (D1) toward the upper portion of each of the first battery cells (121A). The bend portion (142_2) may overlap with each of the first battery cells (121A) in a third direction (D3).

[0114] Although the first cooling plate (141F) of the first battery cell assembly (120A_1) is illustrated as including a bend (141_2) and the second cooling plate (142F) is illustrated as including a bend (142_2), it is obvious that the first cooling plate (141) and the second cooling plate (142) of the second battery cell assembly (120B, see FIG. 3) may each also include a bend.

[0115]

[0116] FIG. 7 is a drawing showing a first battery cell assembly (120A_2) to explain a battery pack (100) according to exemplary embodiments of the technical concept of the present invention. Specifically, the first battery cell assembly (120A_2) of FIG. 7 is another embodiment of the first battery cell assembly (120A) of FIG. 2, and will be described below with a focus on the differences.

[0117] Referring to FIG. 7, the first battery cell assembly (120A_2) may include a plurality of first battery cells (121A), one or more first cooling plates (141F), one or more second cooling plates (142F), a lower heat absorption layer (131), and an upper heat absorption layer (132) disposed on top of the plurality of first battery cells (121A). The upper heat absorption layer (132) may be spaced apart from the lower heat absorption layer (131) with the plurality of first battery cells (121A) in between. The upper heat absorption layer (132) may be spaced apart from the lower heat absorption layer (131) in a third direction (D3) with the plurality of first battery cells (121A) in between.

[0118] The first cooling plate (141F) may include a body portion (141_1) and a bend portion (141_2). Refer to FIG. 6 for a description of the body portion (141_1) and the bend portion (141_2) of the first cooling plate (141F). The body portion (141_1) may be in contact with the lower heat absorption layer (131). The bend portion (141_2) may be in contact with the upper heat absorption layer (132).

[0119] The second cooling plate (142F) may include a body portion (142_1) and a bend portion (142_2). Refer to FIG. 7 for a description of the body portion (142_1) and the bend portion (142_2) of the second cooling plate (142F). The body portion (142_1) may be in contact with the lower heat absorption layer (131). The bend portion (142_2) may be in contact with the upper heat absorption layer (132).

[0120] In the embodiments, the first cooling plate (141F) and the second cooling plate (142F) can absorb heat generated from the adjacent first battery cell (121A) and transfer it to the lower heat absorption layer (131) and the upper heat absorption layer (132).

[0121] Although the first battery cell assembly (120A_2) in this specification is illustrated as including an upper heat absorption layer (132), it is obvious that the second battery cell assembly (120B, see FIG. 3) may also include an upper heat absorption layer.

[0122]

[0123] According to embodiments of the technical concept of the present invention described with reference to FIG. 7, the first battery cell assembly (120A_2) may further include an upper heat absorption layer (132) in addition to the lower heat absorption layer (131), thereby improving cooling performance. Additionally, since the first cooling plate (141F) and the second cooling plate (142F) each include a bending portion (141_2, 142_2), the contact area with the upper heat absorption layer (132) is improved, thereby improving cooling performance.

[0124]

[0125] A battery pack (100) with enhanced safety can be provided by embodiments according to the technical concept of the present invention.

[0126] A battery pack (100) with improved performance and reliability can be provided by embodiments according to the technical concept of the present invention.

[0127] A battery pack (100) with reduced weight can be provided by embodiments according to the technical concept of the present invention.

[0128]

[0129] (2nd Example)

[0130] FIG. 8 is a drawing showing a battery pack (100_1) according to exemplary embodiments based on the technical concept of the present invention.

[0131] Referring to FIG. 8, the battery pack (100_1) may include a pack housing (110) and a plurality of battery cell assemblies (120).

[0132] The pack housing (110) may provide a space for mounting battery cell assemblies (120). The pack housing (110) may include a base plate (111), side walls (112, 113, 114, 115), a center beam (116), and cross beams (117). For a description of the pack housing (110), refer to FIG. 1.

[0133] In the embodiments, a plurality of battery cell assemblies (120) may include a first battery cell assembly (120A) and a second battery cell assembly (120B). Within the battery pack (100_1), the first battery cell assembly (120A) and the second battery cell assembly (120B) may be arranged in a second direction (D2). For the first battery cell assembly (120A) and the second battery cell assembly (120B), reference may be made to the description with reference to FIGS. 2 through 4.

[0134] Specifically, each of the first battery cell assembly (120A) and the second battery cell assembly (120B) may include one or more first cooling plates (141) and one or more second cooling plates (142). As described above, the sum of the heat absorption amounts per hour of the first cooling plate (141) and the second cooling plate (142) within the first battery cell assembly (120A) may differ from the sum of the heat absorption amounts per hour of the first cooling plate (141) and the second cooling plate (142) within the second battery cell assembly (120B).

[0135] In other words, the battery pack (100_1) may include a first battery cell assembly (120A) and a second battery cell assembly (120B) arranged in a second direction (D2), having different sums of heat absorption amounts per hour.

[0136] According to exemplary embodiments based on the technical concept of the present invention, the temperature difference between the first battery cell assembly (120A) and the second battery cell assembly (120B) arranged in the second direction (D2) within the battery pack (100_1) can be reduced.

[0137] A battery pack (100_1) with enhanced safety can be provided by embodiments according to the technical concept of the present invention.

[0138] A battery pack (100_1) with improved performance and reliability can be provided by embodiments according to the technical concept of the present invention.

[0139]

[0140] (3rd Example)

[0141] FIG. 9 is a drawing showing a battery pack (100_2) according to exemplary embodiments based on the technical concept of the present invention.

[0142] Referring to FIG. 9, the battery pack (100_2) may include a pack housing (110) and a plurality of battery cell assemblies (120). Refer to FIG. 1 for a description of the pack housing (110).

[0143] In the embodiments, a plurality of battery cell assemblies (120) may include a first battery cell assembly (120A) and a second battery cell assembly (120B). Within the battery pack (100_2), the first battery cell assembly (120A) and the second battery cell assembly (120B) may be arranged diagonally. The diagonal direction may be located in the same plane as the first direction (D1) and the second direction (D2) and may intersect with the third direction (D3). The diagonal direction may be at an angle that is not perpendicular to the first direction (D1) and the second direction (D2) and may be substantially perpendicular to the third direction (D3). For the first battery cell assembly (120A) and the second battery cell assembly (120B), reference may be made to the description with reference to FIGS. 2 through 4.

[0144] Specifically, each of the first battery cell assembly (120A) and the second battery cell assembly (120B) may include one or more first cooling plates (141) and one or more second cooling plates (142). As described above, the sum of the heat absorption amounts per hour of the first cooling plate (141) and the second cooling plate (142) within the first battery cell assembly (120A) may differ from the sum of the heat absorption amounts per hour of the first cooling plate (141) and the second cooling plate (142) within the second battery cell assembly (120B).

[0145] In other words, the battery pack (100_2) may include a first battery cell assembly (120A) and a second battery cell assembly (120B) arranged in the diagonal direction, having different sums of heat absorption amounts per hour.

[0146] According to exemplary embodiments based on the technical concept of the present invention, the temperature difference between the first battery cell assembly (120A) and the second battery cell assembly (120B) arranged diagonally within the battery pack (100_2) can be reduced.

[0147] A battery pack (100_2) with enhanced safety can be provided by embodiments according to the technical concept of the present invention.

[0148] A battery pack (100_2) with improved performance and reliability can be provided by embodiments according to the technical concept of the present invention.

[0149]

[0150] (Fourth Example)

[0151] FIG. 10 is a drawing showing a battery pack (100_3) according to exemplary embodiments based on the technical concept of the present invention.

[0152] FIG. 11 is a drawing showing a third battery cell assembly (120C) to explain a battery pack (100_3) according to exemplary embodiments of the technical concept of the present invention.

[0153] Referring to FIGS. 10 and 11, the battery pack (100_3) may include a pack housing (110) and a plurality of battery cell assemblies (120). Refer to FIG. 1 for a description of the pack housing (110).

[0154] In the embodiments, a plurality of battery cell assemblies (120) may include a second battery cell assembly (120B) and a third battery cell assembly (120C). Within the battery pack (100_3), the second battery cell assembly (120B) and the third battery cell assembly (120C) may be arranged in a first direction (D1).

[0155] In the embodiments, the second battery cell assembly (120B) may include a plurality of second battery cells (121B) arranged in a first direction (D1), one or more first cooling plates (141), one or more second cooling plates (142), and a lower heat absorption layer (131). Refer to FIGS. 2 through 4 for the one or more first cooling plates (141), one or more second cooling plates (142), and the lower heat absorption layer (131).

[0156] In the embodiments, the third battery cell assembly (120C) may include a plurality of third battery cells (121C) arranged in a first direction (D1), one or more first cooling plates (141), and a lower heat absorption layer (131).

[0157] Specifically, the first cooling plate (141) includes a channel through which a cooling material flows, and the second cooling plate (142) may not include a channel through which a cooling material flows.

[0158] In the embodiments, the second battery cell assembly (120B) includes a second cooling plate (142), whereas the third battery cell assembly (120C) may not include a second cooling plate (142).

[0159] As described above, the first cooling plate (141) and the second cooling plate (142) may have different heat absorption amounts per hour. Accordingly, the sum of the heat absorption amounts per hour of the first cooling plate (141) and the second cooling plate (142) within the second battery cell assembly (120B) may differ from the sum of the heat absorption amounts per hour of the first cooling plate (141) within the third battery cell assembly (120C).

[0160] For example, the hourly heat absorption of the first cooling plate (141) may be greater than the hourly heat absorption of the second cooling plate (142). Accordingly, the sum of the hourly heat absorption of the first cooling plate (141) within the third battery cell assembly (120C) may be greater than the sum of the hourly heat absorption of the first cooling plate (141) and the second cooling plate (142) within the second battery cell assembly (120B).

[0161] According to exemplary embodiments based on the technical concept of the present invention, the temperature difference between the second battery cell assembly (120B) and the third battery cell assembly (120C) arranged in the first direction (D1) within the battery pack (100_3) can be reduced.

[0162] A battery pack (100_3) with enhanced safety can be provided by embodiments according to the technical concept of the present invention.

[0163] A battery pack (100_3) with improved performance and reliability can be provided by embodiments according to the technical concept of the present invention.

[0164]

[0165] (5th Example)

[0166] FIG. 12 is a drawing showing a battery pack (100_4) according to exemplary embodiments based on the technical concept of the present invention.

[0167] FIG. 13 is a drawing showing a fourth battery cell assembly (120D) to explain a battery pack (100_4) according to exemplary embodiments of the technical concept of the present invention.

[0168] Referring to FIGS. 12 and 13, the battery pack (100_4) may include a pack housing (110) and a plurality of battery cell assemblies (120). Refer to FIG. 1 for a description of the pack housing (110).

[0169] In the embodiments, a plurality of battery cell assemblies (120) may include a first battery cell assembly (120A) and a fourth battery cell assembly (120D). Within the battery pack (100_3), the first battery cell assembly (120A) and the fourth battery cell assembly (120D) may be arranged in a first direction (D1).

[0170] In the embodiments, the first battery cell assembly (120A) may include a plurality of first battery cells (121A) arranged in a first direction (D1), one or more first cooling plates (141), one or more second cooling plates (142), and a lower heat absorption layer (131). Refer to FIGS. 2 through 4 for the one or more first cooling plates (141), one or more second cooling plates (142), and the lower heat absorption layer (131).

[0171] In the embodiments, the fourth battery cell assembly (120D) may include a plurality of fourth battery cells (121D) arranged in a first direction (D1), one or more second cooling plates (142), and a lower heat absorption layer (131).

[0172] Specifically, the first cooling plate (141) includes a channel through which a cooling material flows, and the second cooling plate (142) may not include a channel through which a cooling material flows.

[0173] In the embodiments, the first battery cell assembly (120A) includes a first cooling plate (141), whereas the fourth battery cell assembly (120D) may not include a first cooling plate (141).

[0174] As described above, the first cooling plate (141) and the second cooling plate (142) may have different heat absorption amounts per hour. Accordingly, the sum of the heat absorption amounts per hour of the first cooling plate (141) and the second cooling plate (142) within the first battery cell assembly (120A) may differ from the sum of the heat absorption amounts per hour of the second cooling plate (142) within the fourth battery cell assembly (120D).

[0175] For example, the hourly heat absorption of the first cooling plate (141) may be greater than the hourly heat absorption of the second cooling plate (142). Accordingly, the sum of the hourly heat absorption of the first cooling plate (141) and the second cooling plate (142) within the first battery cell assembly (120A) may be greater than the sum of the hourly heat absorption of the second cooling plate (142) within the fourth battery cell assembly (120D).

[0176] According to exemplary embodiments based on the technical concept of the present invention, the temperature difference between the first battery cell assembly (120A) and the fourth battery cell assembly (120D) arranged in the first direction (D1) within the battery pack (100_4) can be reduced.

[0177] A battery pack (100_4) with enhanced safety can be provided by embodiments according to the technical concept of the present invention.

[0178] A battery pack (100_4) with improved performance and reliability can be provided by embodiments according to the technical concept of the present invention.

[0179]

[0180] (6th Example)

[0181] FIG. 14 is a drawing showing a battery pack (100_5) according to exemplary embodiments based on the technical concept of the present invention.

[0182] Referring to FIG. 14, the battery pack (100_5) may include a pack housing (110) and a plurality of battery cell assemblies (120). Refer to FIG. 1 for a description of the pack housing (110).

[0183] In the embodiments, a plurality of battery cell assemblies (120) may include a third battery cell assembly (120C) and a fourth battery cell assembly (120D). Within the battery pack (100_3), the third battery cell assembly (120C) and the fourth battery cell assembly (120D) may be arranged in a first direction (D1). For the third battery cell assembly (120C) and the fourth battery cell assembly (120D), reference may be made to FIGS. 10 through 13.

[0184] In the embodiments, the sum of the hourly heat absorption amounts of the first cooling plate (141) in the third battery cell assembly (120C) may differ from the sum of the hourly heat absorption amounts of the second cooling plate (142) in the fourth battery cell assembly (120D).

[0185] For example, the sum of the heat absorption per hour of the first cooling plate (141) in the third battery cell assembly (120C) may be greater than the sum of the heat absorption per hour of the second cooling plate (142) in the fourth battery cell assembly (120D).

[0186] According to exemplary embodiments based on the technical concept of the present invention, the temperature difference of the third battery cell assembly (120C) and the fourth battery cell assembly (120D) arranged in the first direction (D1) within the battery pack (100_5) can be reduced.

[0187] A battery pack (100_5) with enhanced safety can be provided by embodiments according to the technical concept of the present invention.

[0188] A battery pack (100_5) with improved performance and reliability can be provided by embodiments according to the technical concept of the present invention.

[0189]

[0190] 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. Pack housing; and It includes a first battery cell assembly and a second battery cell assembly accommodated in the above-mentioned pack housing, and The above first battery cell assembly includes one or more first cooling plates and one or more second cooling plates, and The second battery cell assembly comprises one or more of the first cooling plates and one or more of the second cooling plates, and The number of one or more first cooling plates included in the first battery cell assembly is different from the number of one or more first cooling plates included in the second battery cell assembly, and Each of the above one or more first cooling plates includes a channel through which a cooling material flows, and A battery pack in which the above-mentioned cooling material flows while undergoing a phase change between a gaseous state and a liquid state.

2. In Paragraph 1, The number of one or more second cooling plates included in the first battery cell assembly is different from the number of one or more second cooling plates included in the second battery cell assembly, and A battery pack in which the above one or more second cooling plates do not include a channel through which the cooling material flows.

3. In Paragraph 1, The above-mentioned Euro comprises one or more circulating Euros, a battery pack.

4. In Paragraph 1, The above Euro is a battery pack with an engraved pattern.

5. In Paragraph 1, Each of the one or more first cooling plates and the one or more second cooling plates included in the first battery cell assembly absorbs heat from adjacent first battery cells within the first battery cell assembly, and A battery pack in which the heat absorption amount per hour of each of the above one or more first cooling plates is different from the heat absorption amount per hour of each of the above one or more second cooling plates.

6. In Paragraph 5, Each of the one or more first cooling plates and the one or more second cooling plates included in the second battery cell assembly absorbs heat from adjacent second battery cells within the second battery cell assembly, and A battery pack in which the sum of the hourly heat absorption amounts of the one or more first cooling plates and the one or more second cooling plates in the first battery cell assembly is different from the sum of the hourly heat absorption amounts of the one or more first cooling plates and the one or more second cooling plates in the second battery cell assembly.

7. In Paragraph 1, The first battery cell assembly comprises a first case, a plurality of first battery cells on a bottom portion of the first case, and a lower heat absorption layer between the plurality of first battery cells and the bottom portion. A battery pack in which each of the one or more first cooling plates and the one or more second cooling plates included in the first battery cell assembly is in contact with the lower heat absorption layer.

8. In Paragraph 7, The first battery cell assembly further includes an upper heat absorption layer on top of the plurality of first battery cells, and A battery pack in which each of the one or more first cooling plates and the one or more second cooling plates included in the first battery cell assembly is in contact with the upper heat absorption layer.

9. In Paragraph 1, The first battery cell assembly includes a plurality of first battery cells arranged in a first direction, and Each of the first cooling plates comprises a body portion that overlaps the plurality of first battery cells in the first direction and a bend portion that protrudes from the body portion in the first direction toward the upper portion of the plurality of first battery cells. A battery pack in which the above-mentioned Euro forms a single circulation path in the body portion and the above-mentioned bend portion.

10. In Paragraph 1, The first battery cell assembly includes a plurality of first battery cells arranged in a first direction, and The first battery cell assembly and the second battery cell assembly are arranged in the first direction, forming a battery pack.

11. In Paragraph 1, The first battery cell assembly includes a plurality of first battery cells arranged in a first direction, and A battery pack in which the first battery cell assembly and the second battery cell assembly are arranged in a second direction intersecting the first direction.

12. Pack housing; and It includes a first battery cell assembly and a second battery cell assembly accommodated in the above-mentioned pack housing, and The first battery cell assembly includes one or more first cooling plates, and The second battery cell assembly includes one or more of the first cooling plates and one or more of the second cooling plates, and The number of one or more first cooling plates included in the first battery cell assembly is different from the number of one or more first cooling plates included in the second battery cell assembly, and The first battery cell assembly above does not include the second cooling plate, and Each of the above one or more first cooling plates includes a channel through which a cooling material flows, and The second cooling plate above does not include a channel through which the cooling material flows, and A battery pack in which the above-mentioned cooling material flows while undergoing a phase change between a gaseous state and a liquid state.

13. Pack housing; and It includes a first battery cell assembly and a second battery cell assembly accommodated in the above-mentioned pack housing, and The above first battery cell assembly includes one or more first cooling plates and one or more second cooling plates, and The second battery cell assembly includes one or more of the second cooling plates, and The second battery cell assembly above does not include the first cooling plate, and The number of one or more second cooling plates included in the first battery cell assembly is different from the number of one or more second cooling plates included in the second battery cell assembly, and Each of the above one or more first cooling plates includes a channel through which a cooling material flows, and The second cooling plate above does not include a channel through which the cooling material flows, and A battery pack in which the above-mentioned cooling material flows while undergoing a phase change between a gaseous state and a liquid state.

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