Battery cell assembly and battery pack comprising same

Abstract

According to exemplary embodiments of the present invention, a battery cell assembly can be provided. The battery cell assembly comprises: a plurality of battery cells including a first battery cell, a second battery cell, a third battery cell and a fourth battery cell arranged in a first direction; a first cooling plate, which is disposed between the first battery cell and the second battery cell and includes a flow path through which a cooling material flows; and a second cooling plate disposed between the third battery cell and the fourth battery cell, wherein the cooling material can flow while the phase thereof changes between a gaseous state and a liquid state.

Description

Battery cell assembly and battery pack including the same

[0001] The present invention relates to a battery cell assembly and a battery pack including the same. Specifically, the present invention relates to a battery cell assembly including a cooling plate and a battery pack including the same.

[0002] This application claims the benefit of Korean application No. 10-2024-0154863, filed on November 5, 2024, 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 cell assembly with enhanced safety.

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

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

[0008] The problem that the technical concept of the present invention aims to solve is to provide a battery pack with enhanced safety.

[0009] The problem that the technical concept of the present invention aims to solve is to provide a battery pack with improved performance and reliability.

[0010] The problem that the technical concept of the present invention aims to solve is to provide a battery pack with reduced weight.

[0011] According to exemplary embodiments of the present invention for solving the above-described problem, a battery cell assembly may be provided. The battery cell assembly comprises a plurality of battery cells including a first battery cell, a second battery cell, a third battery cell, and a fourth battery cell arranged in a first direction; a first cooling plate disposed between the first battery cell and the second battery cell and including a flow path through which a cooling material flows; and a second cooling plate disposed between the third battery cell and the fourth battery cell, wherein the cooling material may flow while undergoing a phase change between a gaseous state and a liquid state.

[0012] The second cooling plate above may not include a channel through which the cooling material flows.

[0013] The above Euro may include one or more circulating Euros.

[0014] A case accommodating the plurality of battery cells; and a lower heat absorption layer disposed between the bottom portion of the case and the plurality of battery cells, wherein the first cooling plate and the second cooling plate can come into contact with the lower heat absorption layer.

[0015] The first cooling plate comprises a body portion that overlaps the first battery cell and the second battery cell in the first direction; and a bend portion that protrudes from the body portion toward the upper part of the first battery cell in the first direction, and the fluid path may form a single circulation fluid path in the body portion and the bend portion.

[0016] A case accommodating the plurality of battery cells; and further comprising an upper heat absorption layer spaced apart from the bottom portion of the case with the plurality of battery cells and the first cooling plate in between, on the plurality of battery cells, and the bending portion may come into contact with the upper heat absorption layer.

[0017] The above Euro may be an engraved pattern.

[0018] Each of the first cooling plate and the second cooling plate absorbs heat from an adjacent battery cell, and the amount of heat absorbed per hour by the first cooling plate may be different from the amount of heat absorbed per hour by the second cooling plate.

[0019] The first battery cell and the second battery cell may be positioned in the central part among the plurality of battery cells, and the third battery cell and the fourth battery cell may be positioned in the peripheral part among the plurality of battery cells.

[0020] The first battery cell and the second battery cell are positioned in the periphery among the plurality of battery cells, and the third battery cell and the fourth battery cell may be positioned in the central part among the plurality of battery cells.

[0021] According to exemplary embodiments of the present invention for solving the above-described problem, a battery cell assembly may be provided. The battery cell assembly comprises: a case capable of accommodating a plurality of battery cells inside; the plurality of battery cells including a first battery cell and a second battery cell arranged in a first direction, disposed on a bottom portion of the case; a lower heat absorption layer between the bottom portion and the plurality of battery cells; and an upper heat absorption layer spaced apart from the lower heat absorption layer in a second direction intersecting the first direction, with the plurality of battery cells in between. The cooling plate is disposed between the first battery cell and the second battery cell and includes a channel through which a cooling material flows, wherein the cooling plate includes a body portion that overlaps the first battery cell and the second battery cell in the first direction and a bend portion that overlaps the first battery cell in the second direction, wherein the body portion contacts the lower heat absorption layer and the bend portion contacts the upper heat absorption layer, and the channel forms a single circulation channel in the body portion and the bend portion, and the cooling material can flow while undergoing a phase change between a gaseous state and a liquid state.

[0022] The above cooling plate may include an L-shaped cross-section.

[0023] According to exemplary embodiments of the present invention, a battery cell assembly can reduce temperature variation within the battery cell assembly by mixing a first cooling plate having a channel through which a cooling material flows and a second cooling plate not having said channel. Additionally, the weight of the first cooling plate can be reduced by forming said channel as an intaglio etching pattern, and the weight of the battery cell assembly including said cooling plate can be reduced.

[0024] According to exemplary embodiments of the present invention, a battery cell assembly with enhanced safety can be provided.

[0025] According to exemplary embodiments of the present invention, a battery cell assembly with improved performance and reliability can be provided.

[0026] According to exemplary embodiments of the present invention, a battery cell assembly with reduced weight can be provided.

[0027] According to exemplary embodiments of the present invention, a battery pack with enhanced safety can be provided by including the battery cell assembly.

[0028] According to exemplary embodiments of the present invention, a battery pack with improved performance and reliability can be provided by including the battery cell assembly.

[0029] According to exemplary embodiments of the present invention, a battery pack with reduced weight including the battery cell assembly can be provided.

[0030] 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.

[0031] FIG. 1 is a drawing showing a battery cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0032] FIG. 2 is a cross-sectional view of a cooling plate for illustrating a battery cell assembly according to exemplary embodiments of the technical concept of the present invention.

[0033] FIG. 3 is a cross-sectional view of a cooling plate to illustrate a battery cell assembly according to exemplary embodiments of the technical concept of the present invention.

[0034] FIG. 4 is an exploded perspective view of a battery cell to illustrate a battery cell assembly according to exemplary embodiments of the technical concept of the present invention.

[0035] FIG. 5 is a drawing showing a battery cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0036] FIG. 6 is a drawing showing a battery cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0037] FIG. 7 is a drawing showing a battery cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0038] FIG. 8 is a drawing showing a battery cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0039] FIG. 9 is a drawing showing a battery cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0040] FIG. 10 is a drawing showing a battery cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0041] FIG. 11 is a plan view of a battery pack according to exemplary embodiments of the technical concept of the present invention.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046]

[0047] (1st embodiment)

[0048] FIG. 1 is a drawing showing a battery cell assembly (120A) according to exemplary embodiments of the technical concept of the present invention.

[0049] FIG. 2 is a cross-sectional view of a first cooling plate (141) for illustrating a battery cell assembly (120A) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 2 is a cross-sectional view of a first cooling plate (141).

[0050] FIG. 3 is a cross-sectional view of a first cooling plate (141') to illustrate a battery cell assembly (120A) according to exemplary embodiments of the technical concept of the present invention.

[0051]

[0052] Referring to FIG. 1, the battery cell assembly (120A) may include a plurality of battery cells (121_1, 121_2, 121_3, 121_4, 121_5, 121_6, 121_7, 121_8, 121_9, 121_10, 121_11, and 121_12, hereinafter 121_1 to 121_12).

[0053] In the embodiments, a plurality of battery cells (121_1 to 121_12) may be arranged in a first direction (D1). The plurality of battery cells (121_1 to 121_12) may be joined, for example, by an adhesive.

[0054] In the embodiments, a lower heat absorption layer (131) may be disposed below a plurality of battery cells (121_1 to 121_12). The lower heat absorption layer (131) may overlap with the plurality of battery cells (121_1 to 121_12) in a third direction (D3). The third direction (D3) may intersect with the first direction (D1). The lower heat absorption layer (131) may be in contact with the plurality of battery cells (121_1 to 121_12).

[0055] For example, the lower heat absorption layer (131) may include a thermal resin, a thermal interface material (TIM), or a gap filler.

[0056] In the embodiments, a first cooling plate (141) may be disposed between a plurality of battery cells (121_1 to 121_12). Specifically, the first cooling plate (141) may be disposed between each of some of the battery cells located in the central part among the plurality of battery cells (121_1 to 121_12). In this specification, the central part among the plurality of corresponding components may refer to a part including the middle of the arrangement of the plurality of corresponding components. For example, the first cooling plate (141) may be disposed between each of the battery cells (121_4, 121_5, 121_6, 121_7, 121_8, and 121_9, hereinafter 121_4 to 121_9). The first cooling plate (141) may be disposed between two adjacent battery cells among the battery cells (121_4 to 121_9).

[0057] The first cooling plate (141) may be in contact with each of the battery cells (121_4 to 121_9). The first cooling plate (141) may be in contact with the lower heat absorption layer (131). The first cooling plate (141) may include a channel through which a cooling material flows. The first cooling plate (141) and its channel will be described later with reference to FIGS. 2 and FIGS. 3.

[0058] In the embodiments, a second cooling plate (142) may be disposed between a plurality of battery cells (121_1 to 121_12). Specifically, the second cooling plate (142) may be disposed between each of some of the battery cells disposed in the periphery among the plurality of battery cells (121_1 to 121_12). In this specification, the periphery among the plurality of corresponding components may refer to a portion excluding the central portion. For example, the second cooling plate (142) may be disposed between each of the battery cells (121_1, 121_2, 121_3, and 121_4, hereinafter 121_1 to 121_4). The second cooling plate (142) may be disposed between two adjacent battery cells among the battery cells (121_1 to 121_4). For example, a second cooling plate (142) may be placed between each of the battery cells (121_9, 121_10, 121_11, and 121_12, hereinafter 121_9 to 121_12). The second cooling plate (142) may be placed between two adjacent battery cells among the battery cells (121_9 to 121_12).

[0059] The second cooling plate (142) may be in contact with each of the battery cells (121_1 to 121_4) and each of the battery cells (121_9 to 121_12). The second cooling plate (142) may be in contact with the lower heat absorption layer (131). The second cooling plate (142) may not include a channel through which a cooling material flows.

[0060]

[0061] In some embodiments, as illustrated in FIG. 2, 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 (141F) may flow within the channel (141R).

[0062] Specifically, the cooling material (141F) is filled into the flow path (141R) and can flow while undergoing a phase change between a liquid state (141F_l) and a gaseous state (141F_g). For example, the cooling material (141F) can vibrate due to a pressure difference caused by condensation and evaporation, and the cooling material (141F) can flow due to this vibration and cool the battery cell.

[0063] 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 (141F) may be filled into the etched space. For example, the first cooling plate (141) may be an aluminum plate having an etched pattern inside.

[0064] 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 (141F) can flow and circulate by undergoing repeated phase changes and vibrations caused by this.

[0065]

[0066] In some other embodiments, as illustrated in FIG. 3, the first cooling plate (141') may include a plate (141P) and a channel (141R'). The first cooling plate (141A) is another embodiment of the first cooling plate (141) described with reference to FIG. 1 and FIG. 2, and will be described below mainly in terms of the differences from the first cooling plate (141).

[0067] A cooling material (141F) can flow within the flow path (141R') of the first cooling plate (141'). The flow path (141R') can form a plurality of circulation paths within the plate (141P). The flow path (141R') includes a plurality of closed circulation paths, and within each circulation path, the cooling material (141F) can flow and circulate by undergoing repeated phase changes and vibrations caused by this.

[0068]

[0069] Referring again to FIG. 1, the first cooling plate (141) and the second cooling plate (142) can each absorb heat from adjacent battery cells. For example, the first cooling plate (141) and the second cooling plate (142) can each absorb heat from a plurality of battery cells (121_1 to 121_12) in contact with each.

[0070] For example, the first cooling plate (141) can absorb heat generated from adjacent battery cells (121_4 to 121_9). 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 the cooling material (141F) 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 adjacent battery cells (121_4 to 121_9). In some embodiments, the lower heat absorption layer (131) can transfer the heat to a separately provided heat sink.

[0071] For example, the second cooling plate (142) can absorb heat generated from adjacent battery cells (121_1 to 121_4, and 121_9 to 121_12). 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.

[0072] 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 contain 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).

[0073] Accordingly, the first cooling plate (141) and the second cooling plate (142) can be placed in the central or peripheral portion, respectively. That is, by placing the first cooling plate (141) and the second cooling plate (142) between the battery cells in the central or peripheral portion, respectively, the temperature difference of a plurality of battery cells (121_1 to 121_12) within the battery cell assembly (120A) can be reduced.

[0074] For example, if the degree of heat generation of the battery cells (121_4 to 121_9) in the central part of the battery cell assembly (120A) is greater than the degree of heat generation of the battery cells (121_1 to 121_4 and 121_9 to 121_12) in the peripheral part, as exemplified in FIG. 1, a first cooling plate (141) may be placed between each of the battery cells (121_4 to 121_9) in the central part, and a second cooling plate (142) may be placed between each of the battery cells (121_1 to 121_4) in the peripheral part and between each of the battery cells (121_9 to 121_12). By doing so, the degree of temperature reduction of the battery cells (121_4 to 121_9) in the central part may be greater than the degree of temperature reduction of each of the battery cells (121_1 to 121_4) in the peripheral part and the battery cells (121_9 to 121_12). That is, the temperature difference of multiple battery cells (121_1 to 121_12) within the battery cell assembly (120A) can be reduced.

[0075] In addition, as described above, the first cooling plate (141) may include a channel that is an engraved pattern, thereby reducing the weight compared to the second cooling plate (142). Thus, the weight of the battery cell assembly (120A) can be reduced by placing the first cooling plate (141) and the second cooling plate (142) together, as exemplified in FIG. 1, rather than placing the second cooling plate (142) between each of the plurality of battery cells (121_1 to 121_12).

[0076]

[0077] In the embodiments, a plurality of battery cells (121_1 to 121_12) can form a plurality of banks. For example, battery cells (121_1, 121_2, 121_3) can be connected in parallel to form the first bank. Battery cells (121_4, 121_5, 121_6) can be connected in parallel to form the second bank. Battery cells (121_7, 121_8, 121_9) can be connected in parallel to form the third bank. Battery cells (121_10, 121_11, 121_12) can be connected in parallel to form the fourth bank. A plurality of banks can be connected in series.

[0078] The resulting connection form of multiple battery cells (121_1 to 121_12) may be referred to as 3 parallel to 4 series (3P-4S), but this is for illustrative purposes only and does not limit the technical concept of the present invention in any sense. The number of series-connected banks and the number of battery cells (121_1 to 121_12) included in the multiple banks may be determined according to the magnitude of the voltage and current to be output from the battery cell assembly (120A).

[0079] The battery cell assembly (120A) may further include pads, a first integrated circuit assembly, a second integrated circuit assembly, and a Flexible Flat Cable (FFC) assembly.

[0080] The pads can absorb swelling of multiple battery cells (121_1 to 121_12). Each of the pads may contain Polyurethane (PU). Each of the pads may contain a refractory material such as silicone.

[0081] The first integrated circuit assembly may include an insulating frame, an integrated circuit, busbars, sensing plates, sensing bars, temperature sensors, wiring, and an insulating cover. The second integrated circuit assembly may include an insulating frame, an integrated circuit, sensing plates, temperature sensors, wiring, and an insulating cover.

[0082] The first and second integrated circuit assemblies may include physical and functional configurations for providing electrical connections between a plurality of battery cells (121_1 to 121_12), outputting the resulting voltage of the plurality of battery cells (121_1 to 121_12), and measuring the voltage (or current) of nodes within a circuit composed of the plurality of battery cells (121_1 to 121_12).

[0083]

[0084] FIG. 4 is an exploded perspective view of a battery cell (121) to explain a battery cell assembly (120A) according to exemplary embodiments of the technical concept of the present invention.

[0085] Referring together with FIG. 4, 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 battery cells (121_1 to 121_12) of FIG. 1.

[0086] 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.

[0087] 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.

[0088] 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).

[0089] 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).

[0090] 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).

[0091] 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.

[0092] 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.

[0093] 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).

[0094] 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.

[0095] 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.

[0096] 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).

[0097]

[0098] According to embodiments of the technical concept of the present invention described with reference to FIGS. 1 to 4, a first cooling plate (141) and a second cooling plate (142) are respectively placed between battery cells in the central or peripheral portions, thereby reducing the temperature difference of a plurality of battery cells (121_1 to 121_12) within a battery cell assembly (120A). Additionally, the total weight of the battery cell assembly (120A) can be reduced by using a first cooling plate (141) that has a reduced weight compared to the second cooling plate (142).

[0099] According to embodiments of the technical concept of the present invention, a battery cell assembly (120A) with enhanced safety can be provided.

[0100] According to embodiments of the technical concept of the present invention, a battery cell assembly (120A) with improved performance and reliability can be provided.

[0101] According to embodiments of the technical concept of the present invention, a battery cell assembly (120A) with reduced weight may be provided.

[0102]

[0103] (2nd Example)

[0104] FIG. 5 is a drawing showing a battery cell assembly (120B) according to exemplary embodiments of the technical concept of the present invention. Hereinafter, the differences from the battery cell assembly (120A) described with reference to FIG. 1 to 4 will be explained.

[0105] Referring to FIG. 5, the battery cell assembly (120B) may include a plurality of battery cells (121_1 to 121_12) arranged in a first direction (D1). A lower heat absorption layer (131) may be disposed below the plurality of battery cells (121_1 to 121_12).

[0106] In the embodiments, a first cooling plate (141) may be disposed between each of some of the battery cells (121_1 to 121_12) that are positioned in the periphery. For example, a first cooling plate (141) may be disposed between each of the battery cells (121_1 to 121_4). For example, a first cooling plate (141) may be disposed between each of the battery cells (121_9 to 121_12). The first cooling plate (141) may include a channel through which a cooling material flows. The first cooling plate (141) may be in contact with the lower heat absorption layer (131). A description of the first cooling plate (141) may be made with reference to FIGS. 1 to 3.

[0107] In the embodiments, a second cooling plate (142) may be disposed between each of some of the battery cells located in the central part among the plurality of battery cells (121_1 to 121_12). For example, a second cooling plate (142) may be disposed between each of the battery cells (121_4 to 121_9). The second cooling plate (142) may not include a channel through which a cooling material flows. The second cooling plate (142) may be in contact with the lower heat absorption layer (131). For a description of the second cooling plate (142), refer to the description made with reference to FIG. 1.

[0108] In the embodiments, the first cooling plate (141) can absorb heat generated from adjacent battery cells (121_1 to 121_4, and 121_9 to 121_12). The second cooling plate (142) can absorb heat generated from adjacent battery cells (121_4 to 121_9).

[0109] In the embodiments, if the degree of heat generation of the peripheral battery cells (121_1 to 121_4 and 121_9 to 121_12) of the battery cell assembly (120B) is greater than the degree of heat generation of the central battery cells (121_4 to 121_9), a first cooling plate (141) may be placed between each of the peripheral battery cells (121_1 to 121_4) and each of the battery cells (121_9 to 121_12), as illustrated in FIG. 5, and a second cooling plate (142) may be placed between each of the central battery cells (121_4 to 121_9). By doing so, the degree of temperature reduction of the peripheral battery cells (121_1 to 121_4 and 121_9 to 121_12) may be greater than the degree of temperature reduction of the central battery cells (121_4 to 121_9). That is, the temperature difference of multiple battery cells (121_1 to 121_12) within the battery cell assembly (120B) can be reduced.

[0110] In addition, the weight of the battery cell assembly (120B) can be reduced by arranging the first cooling plate (141) and the second cooling plate (142) together.

[0111]

[0112] According to embodiments of the technical concept of the present invention, a battery cell assembly (120B) with enhanced safety can be provided.

[0113] According to embodiments of the technical concept of the present invention, a battery cell assembly (120B) with improved performance and reliability may be provided.

[0114] According to embodiments of the technical concept of the present invention, a battery cell assembly (120B) with reduced weight may be provided.

[0115]

[0116] (3rd Example)

[0117] FIG. 6 is a drawing showing a battery cell assembly (120C) according to exemplary embodiments based on the technical concept of the present invention. Hereinafter, the differences from the battery cell assembly (120A) described with reference to FIG. 1 to 4 will be explained.

[0118] Referring to FIG. 6, the battery cell assembly (120C) may include a plurality of battery cells (121_1 to 121_12) arranged in a first direction (D1). A lower heat absorption layer (131) may be disposed below the plurality of battery cells (121_1 to 121_12).

[0119] In the embodiments, a first cooling plate (141) and a second cooling plate (142) may be disposed between a plurality of battery cells (121_1 to 121_12). Specifically, the first cooling plate (141) and the second cooling plate (142) may be disposed alternately between each of the plurality of battery cells (121_1 to 121_12). The description regarding the first cooling plate (141) and the second cooling plate (142) may be referred to with reference to FIGS. 1 to 3.

[0120] For example, a first cooling plate (141) may be placed between the first battery cell (121_1) and the second battery cell (121_2), between the third battery cell (121_3) and the fourth battery cell (121_4), between the fifth battery cell (121_5) and the sixth battery cell (121_6), between the seventh battery cell (121_7) and the eighth battery cell (121_8), between the ninth battery cell (121_9) and the tenth battery cell (121_10), and between the eleventh battery cell (121_11) and the twelveth battery cell (121_12).

[0121] For example, a second cooling plate (142) may be placed between the second battery cell (121_2) and the third battery cell (121_3), between the fourth battery cell (121_4) and the fifth battery cell (121_5), between the sixth battery cell (121_6) and the seventh battery cell (121_7), between the eighth battery cell (121_8) and the ninth battery cell (121_9), and between the tenth battery cell (121_10) and the eleventh battery cell (121_11).

[0122] In the embodiments, the first cooling plate (141) and the second cooling plate (142) can absorb heat generated from a plurality of adjacent battery cells (121_1 to 121_12). By doing so, the performance and reliability of the battery cell assembly (120C) are improved, and safety can be enhanced.

[0123] In addition, the weight of the battery cell assembly (120C) can be reduced by alternately arranging the first cooling plate (141) and the second cooling plate (142).

[0124]

[0125] According to embodiments of the technical concept of the present invention, a battery cell assembly (120C) with enhanced safety can be provided.

[0126] According to embodiments of the technical concept of the present invention, a battery cell assembly (120C) with improved performance and reliability can be provided.

[0127]

[0128] (Fourth Example)

[0129] FIG. 7 is a drawing showing a battery cell assembly (120D) according to exemplary embodiments of the technical concept of the present invention. Hereinafter, the differences from the battery cell assembly (120A) described with reference to FIG. 1 to 4 will be explained.

[0130] Referring to FIG. 7, the battery cell assembly (120C) may include a plurality of battery cells (121_1 to 121_12) arranged in a first direction (D1). A lower heat absorption layer (131) may be disposed below the plurality of battery cells (121_1 to 121_12).

[0131] In the embodiments, a first cooling plate (141A) may be disposed between each of some battery cells located in the central portion among a plurality of battery cells (121_1 to 121_12), and a second cooling plate (142A) may be disposed between each of some battery cells located in the peripheral portion. The first cooling plate (141A) may include a channel through which a cooling material flows. The second cooling plate (142A) may not include a channel through which a cooling material flows. The first cooling plate (141A) may have a reduced weight compared to the second cooling plate (142A). The first cooling plate (141A) and the second cooling plate (142A) may be in contact with the lower heat absorption layer (131).

[0132] In the embodiments, the first cooling plate (141A) 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 central battery cells (121_4 to 121_9) among the plurality of battery cells (121_1 to 121_12). The body portion (141_1) may overlap with each of the plurality of battery cells (121_1 to 121_12) 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 upper portion of each of the battery cells (121_4 to 121_8). The bend portion (141_2) may overlap with each of the battery cells (121_4 to 121_8) in a third direction (D3).

[0133] In the embodiments, the first cooling plate (141A) 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).

[0134] In the embodiments, the second cooling plate (142A) may include a body portion (142_1) and a bend portion (142_2). The body portion (142_1) may overlap with each of the plurality of battery cells (121_1 to 121_12) 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 battery cells (121_1 to 121_3, 121_9 to 121_12). The bend portion (142_2) may overlap with each of the battery cells (121_1 to 121_3, 121_9 to 121_12) in a third direction (D3).

[0135]

[0136] According to embodiments of the technical concept of the present invention, a battery cell assembly (120D) with enhanced safety can be provided.

[0137] According to embodiments of the technical concept of the present invention, a battery cell assembly (120D) with improved performance and reliability can be provided.

[0138] According to embodiments of the technical concept of the present invention, a battery cell assembly (120D) with reduced weight may be provided.

[0139]

[0140] (5th Example)

[0141] FIG. 8 is a drawing showing a battery cell assembly (120E) according to exemplary embodiments of the technical concept of the present invention. Hereinafter, the differences from the battery cell assembly (120A) described with reference to FIG. 1 to 4 will be explained.

[0142] Referring to FIG. 8, the battery cell assembly (120E) may include a plurality of battery cells (121_1 to 121_12) arranged in a first direction (D1). A lower heat absorption layer (131) may be disposed below the plurality of battery cells (121_1 to 121_12).

[0143] In the embodiments, the battery cell assembly (120E) may further include an upper heat absorption layer (132) disposed on top of a plurality of battery cells (121_1 to 121_12). The upper heat absorption layer (132) may be spaced apart from the lower heat absorption layer (131) with the plurality of battery cells (121_1 to 121_12) in between.

[0144] In the embodiments, a first cooling plate (141A) may be disposed between each of some battery cells located in the central portion among a plurality of battery cells (121_1 to 121_12), and a second cooling plate (142A) may be disposed between each of some battery cells located in the peripheral portion. The first cooling plate (141A) may include a channel through which a cooling material flows. The second cooling plate (142A) may not include a channel through which a cooling material flows.

[0145] The first cooling plate (141A) may include a body portion (141_1) and a bend portion (141_2). Refer to FIG. 7 for a description of the body portion (141_1) and the bend portion (141_2) of the first cooling plate (141A). 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).

[0146] The second cooling plate (142A) 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 (142A). 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).

[0147] In the embodiments, the first cooling plate (141A) and the second cooling plate (142A) can absorb heat from a plurality of battery cells (121_1 to 121_12) in contact with each.

[0148] For example, the first cooling plate (141A) can absorb heat generated from the adjacent battery cells (121_4 to 121_9). Specifically, the heat is transferred to the first cooling plate (141A), and the heat can be transferred to the lower heat absorption layer (131) and the upper heat absorption layer (132) by the flow of the cooling material within the flow path.

[0149] For example, the second cooling plate (142A) can absorb heat generated from the adjacent battery cells (121_1 to 121_4, and 121_9 to 121_12).

[0150]

[0151] According to embodiments of the technical concept of the present invention described with reference to FIG. 8, the battery cell assembly (120E) may further include an upper heat absorption layer (132) in addition to the lower heat absorption layer (131) to improve cooling performance. Additionally, since each of the first cooling plate (141A) and the second cooling plate (142A) includes a bending portion (141_2, 142_2), the contact area with the upper heat absorption layer (132) is improved, thereby improving cooling performance.

[0152] According to embodiments of the technical concept of the present invention, a battery cell assembly (120E) with enhanced safety can be provided.

[0153] According to embodiments of the technical concept of the present invention, a battery cell assembly (120E) with improved performance and reliability can be provided.

[0154] According to embodiments of the technical concept of the present invention, a battery cell assembly (120E) with reduced weight may be provided.

[0155]

[0156] (6th Example)

[0157] FIG. 9 is a drawing showing a battery cell assembly (120F) according to exemplary embodiments of the technical concept of the present invention. Hereinafter, the differences from the battery cell assembly (120A) described with reference to FIG. 1 to 4 will be explained.

[0158] Referring to FIG. 9, the battery cell assembly (120F) may include a plurality of battery cells (121_1 to 121_12) arranged in a first direction (D1). A lower heat absorption layer (131) may be disposed below the plurality of battery cells (121_1 to 121_12). An upper heat absorption layer (132) may be disposed above the plurality of battery cells (121_1 to 121_12).

[0159] In the embodiments, a first cooling plate (141A) may be disposed between each of the plurality of battery cells (121_1 to 121_12). The first cooling plate (141A) may include a channel through which a cooling material flows.

[0160] The first cooling plate (141A) may include a body portion (141_1) and a bend portion (141_2). Refer to FIG. 7 for a description of the body portion (141_1) and the bend portion (141_2) of the first cooling plate (141A). 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).

[0161] The first cooling plate (141A) can absorb heat generated from the adjacent battery cells (121_4 to 121_9). Specifically, the heat is transferred to the first cooling plate (141A), and the heat can be transferred to the lower heat absorption layer (131) and the upper heat absorption layer (132) by the flow of the cooling material within the flow path.

[0162]

[0163] According to embodiments of the technical concept of the present invention, a battery cell assembly (120F) with enhanced safety can be provided.

[0164] According to embodiments of the technical concept of the present invention, a battery cell assembly (120F) with improved performance and reliability can be provided.

[0165] According to embodiments of the technical concept of the present invention, a battery cell assembly (120F) with reduced weight may be provided.

[0166]

[0167] (7th Example)

[0168] FIG. 10 is a drawing showing a battery cell assembly (120G) according to exemplary embodiments of the technical concept of the present invention. Hereinafter, the differences from the battery cell assembly (120A) described with reference to FIG. 1 to 4 will be explained.

[0169] Referring to FIG. 10, a plurality of battery cells (121_1 to 121_12) can be accommodated in a lower case (120U). A plurality of battery cells (121_1 to 121_12) can be arranged in a first direction (D1) within the lower case (120U). A plurality of battery cells (121_1 to 121_12) can be covered by the lower case (120U) and the upper case (120T).

[0170] The lower case (120U) may have a U-shaped cross-sectional shape. Accordingly, the lower case (120U) may have a relatively wide opening, and a plurality of battery cells (121_1 to 121_12) can be easily inserted into the lower case (120U). The lower case (120U) may be, for example, a U-frame. The lower case (120U) and the upper case (120T) may be joined by a method such as butt welding. The lower case (120U) and the upper case (120T) may include a metal such as aluminum and stainless steel, and can protect a plurality of battery cells (121_1 to 121_12).

[0171] The lower case (120U) may include a bottom portion (120U_b). The bottom portion (120U_b) may be a portion of the lower case (120U) where a plurality of battery cells (121_1 to 121_12) are arranged. Specifically, the bottom portion (120U_b) may overlap with the plurality of battery cells (121_1 to 121_12) in a third direction (D3).

[0172] In the embodiments, a lower heat absorption layer (131) may be disposed on the bottom portion (120U_b) of the lower case (120U). The lower heat absorption layer (131) may be disposed between the bottom portion (120U_b) and a plurality of battery cells (121_1 to 121_12).

[0173] In the embodiments, the first cooling plate (141) and the second cooling plate (142) are positioned between each of the plurality of battery cells (121_1 to 121_12) and can absorb heat generated from the adjacent plurality of battery cells (121_1 to 121_12). By doing so, the performance and reliability of the battery cell assembly (120G) are improved, and safety can be enhanced.

[0174]

[0175] According to embodiments of the technical concept of the present invention, a battery cell assembly (120G) with enhanced safety can be provided.

[0176] According to embodiments of the technical concept of the present invention, a battery cell assembly (120G) with improved performance and reliability can be provided.

[0177]

[0178] (8th Example)

[0179] FIG. 11 is a plan view of a battery pack (100) according to exemplary embodiments of the technical concept of the present invention.

[0180] Referring to FIG. 11, 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. The battery cell assembly (120) may be a battery cell assembly (120A, 120B, 120C, 120D, 120E, 120F, or 120G) described with reference to FIG. 1 through 10. When the battery pack (100) includes a battery cell assembly (120A through 120F) described with reference to FIG. 1 through 9, the battery pack (100) may have a cell-to-pack structure.

[0181] 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).

[0182] 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).

[0183] 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).

[0184] 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.

[0185] 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-stirred together. Accordingly, the center beam (116) may be formed together with the center plate, and the center beam (116) may be a continuous element integral with the center plate.

[0186] The cross beams (117) can be extended in a second direction (D2). The cross beams (117) can be interposed between the side walls (114, 115).

[0187] 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).

[0188] 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).

[0189] 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.

[0190] In FIG. 11, 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. 11 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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).

[0195] A battery pack (100) according to embodiments of the technical concept of the present invention may each include a first cooling plate (141) or may include battery cell assemblies (120) that include both the first cooling plate (141) and the second cooling plate (142) (see FIGS. 1 to 10). By doing so, the safety of the battery pack (100) is enhanced, performance and reliability are improved, and weight can be reduced.

[0196]

[0197] 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 including a first battery cell, a second battery cell, a third battery cell, and a fourth battery cell arranged in a first direction; A first cooling plate disposed between the first battery cell and the second battery cell and including a channel through which a cooling material flows; and It includes a second cooling plate disposed between the third battery cell and the fourth battery cell, and A battery cell assembly 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 above second cooling plate is a battery cell assembly that does 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 cell assembly.

4. In Paragraph 1, A case accommodating the plurality of battery cells; and It further includes a lower heat absorption layer disposed between the bottom portion of the above case and the plurality of battery cells, and A battery cell assembly in which the first cooling plate and the second cooling plate are in contact with the lower heat absorption layer.

5. In Paragraph 1, The first cooling plate above is, A body portion overlapping the first battery cell and the second battery cell in the first direction; and It includes a bend portion protruding in the first direction from the body portion toward the upper part of the first battery cell, and A battery cell assembly in which the above-mentioned Euro forms a single circulation path in the body portion and the above-mentioned bend portion.

6. In Paragraph 5, A case accommodating the plurality of battery cells; and On the plurality of battery cells, the upper heat absorption layer is further included, spaced apart from the bottom portion of the case with the plurality of battery cells and the first cooling plate in between. A battery cell assembly in which the above-mentioned bending portion contacts the above-mentioned upper heat absorption layer.

7. In Paragraph 1, The above Euro is a battery cell assembly with an engraved pattern.

8. In Paragraph 1, Each of the first cooling plate and the second cooling plate absorbs heat from an adjacent battery cell, and A battery cell assembly in which the heat absorption amount per hour of the first cooling plate is different from the heat absorption amount per hour of the second cooling plate.

9. In Paragraph 1, The first battery cell and the second battery cell are positioned in the central part among the plurality of battery cells, and The above third battery cell and the above fourth battery cell are a battery cell assembly disposed in the periphery among the plurality of battery cells.

10. In Paragraph 1, The first battery cell and the second battery cell are disposed in the periphery among the plurality of battery cells, and The above third battery cell and the above fourth battery cell are a battery cell assembly disposed in the central part among the plurality of battery cells.

11. A case capable of accommodating multiple battery cells internally; The plurality of battery cells, including a first battery cell and a second battery cell arranged in a first direction, disposed on the bottom portion of the above case; A lower heat absorption layer between the bottom portion and the plurality of battery cells; On the plurality of battery cells, an upper heat absorption layer spaced apart from the lower heat absorption layer and the first direction intersecting the plurality of battery cells in a second direction; and A cooling plate disposed between the first battery cell and the second battery cell and including a channel through which a cooling material flows, and The cooling plate comprises a body portion that overlaps the first battery cell and the second battery cell in the first direction, and a bend portion that overlaps the first battery cell in the second direction. The above body part is in contact with the lower heat absorption layer, and The above-mentioned bending portion is in contact with the upper heat absorption layer, and The above-mentioned Euro forms a single circulation path in the body portion and the bend portion, and A battery cell assembly in which the above-mentioned cooling material flows while undergoing a phase change between a gaseous state and a liquid state.

12. In Paragraph 11, The above cooling plate is a battery cell assembly including an L-shaped cross-section.

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