Cover-cell assembly, battery cell assembly comprising same, and battery pack comprising same

Abstract

According to exemplary embodiments of the present invention, a cover-cell assembly is provided. The cover-cell assembly comprises: an electrode assembly including a positive electrode and a negative electrode stacked in a first direction; a case accommodating the electrode assembly; a cell cover coupled to the case; and an air pocket between one surface of the cell cover and the case, wherein the cell cover may include a phase change material (PCM).

Description

Cover-cell assembly, battery cell assembly including the same, and battery pack including the same

[0001] The present invention relates to a cover-cell assembly, a battery cell assembly including the same, and a battery pack including the same.

[0002] [Correction pursuant to Rule 91 27.01.2026] This application claims the benefit of Korean application No. 10-2024-0093498, filed on July 16, 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 cover-cell assembly with enhanced safety.

[0006] The problem that the technical concept of the present invention aims to solve is to provide a cover-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 enhanced safety.

[0008] 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.

[0009] The problem that the technical concept of the present invention aims to solve is to provide a battery pack with enhanced safety.

[0010] The problem that the technical concept of the present invention aims to solve is to provide a battery pack with improved performance and reliability.

[0011] According to exemplary embodiments of the present invention for solving the above-described problem, a cover-cell assembly is provided. The cover-cell assembly comprises: an electrode assembly including a positive electrode and a negative electrode stacked in a first direction; a case for housing the electrode assembly; a cell cover coupled to the case; and an air pocket between one side of the cell cover and the case, wherein the cell cover may comprise a phase change material (PCM).

[0012] The electrode assembly and the case constitute a battery cell, and the cell cover includes a first portion that overlaps the main surface of the battery cell in the first direction and a second portion that overlaps the battery cell in the second direction that intersects the first direction and is connected to the first portion, and the air pocket is disposed between the battery cell and the second portion of the cell cover, and the main surface of the battery cell and the first portion of the cell cover can be in close contact.

[0013] The first portion of the cell cover can completely cover the main surface of the battery cell.

[0014] The first portion of the cell cover may not cover at least a portion of the main surface of the battery cell.

[0015] The above case and the above cell cover can be spaced apart in a second direction that intersects the first direction.

[0016] The cell cover may include a pad case and the phase change material packaged by the pad case.

[0017] The above pad case may include one selected from silicone, polyurethane, polypropylene, metal, and stainless steel.

[0018] The cell cover comprises a sheet and a coating layer applied on the sheet, and the coating layer may comprise a capsule containing the phase change material and a binder mixed with the capsule.

[0019] The cell cover may include a polymer film that seals the phase change material.

[0020] The cell cover may include a thermal conductive compound layer and a capsule containing the phase change material dispersed within the thermal conductive compound layer.

[0021] According to exemplary embodiments of the present invention for solving the above-described problem, a battery pack is provided. The battery pack comprises: a pack housing; a plurality of battery cells arranged in a first direction within the pack housing; and a plurality of cell covers coupled to corresponding ones of the plurality of battery cells, wherein a first portion of each of the plurality of cell covers is in close contact with the main surface of the plurality of battery cells in the first direction, and a second portion of each of the plurality of cell covers is spaced apart from the upper surface of the plurality of battery cells in a second direction intersecting the first direction, and the cell covers may comprise a phase change material (PCM).

[0022] According to exemplary embodiments of the present invention, a cover-cell assembly with enhanced safety can be provided.

[0023] According to exemplary embodiments of the present invention, a cover-cell assembly with improved performance and reliability can be provided.

[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 pack with enhanced safety can be provided.

[0027] According to exemplary embodiments of the present invention, a battery pack with improved performance and reliability can be provided.

[0028] 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.

[0029] FIG. 1 is a drawing showing a cover-cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0030] FIG. 2 is an exploded perspective view of a battery cell to illustrate a cover-cell assembly according to exemplary embodiments of the technical concept of the present invention.

[0031] FIG. 3 is a drawing showing a cover-cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0032] FIG. 4 is an enlarged cross-sectional view showing a part of the configuration of a cover-cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0033] FIG. 5 is an enlarged cross-sectional view showing a part of the configuration of a cover-cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0034] FIG. 6 is an enlarged cross-sectional view showing a part of the configuration of a cover-cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0035] FIG. 7 is an enlarged cross-sectional view showing a part of the configuration of a cover-cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0036] FIG. 8 is an enlarged cross-sectional view showing a part of the configuration of a cover-cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0037] FIG. 9 is a drawing showing a battery cell assembly including a cover-cell assembly according to exemplary embodiments of the technical concept of the present invention.

[0038] FIG. 10 is a drawing showing a battery pack including a cover-cell assembly according to exemplary embodiments of the technical concept of the present invention.

[0039] FIG. 11 is a drawing showing a battery pack including a cover-cell assembly according to exemplary embodiments of 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 cover-cell assembly (122) according to exemplary embodiments of the technical concept of the present invention.

[0047] FIG. 2 is an exploded perspective view of a battery cell (121) to illustrate a cover-cell assembly (122) according to exemplary embodiments of the technical concept of the present invention.

[0048]

[0049] Referring to FIGS. 1 and 2, the cover-cell assembly (122) may include a battery cell (121) and a cell cover (121F) coupled to the battery cell (121). Specifically, the cell cover (121F) may be coupled to a case (121C) of the battery cell (121).

[0050] In some embodiments, the battery cell (121) may include an electrode assembly (121EA) comprising a positive electrode and a negative electrode arranged in a first direction (X direction), a case (121C) housing the electrode assembly (121EA), and a positive terminal (121P) and a negative terminal (121N) protruding in a second direction (Y direction). The second direction (Y direction) may intersect the first direction (X direction). The second direction (Y direction) may be substantially parallel to each of the plurality of positive electrodes of the electrode assembly (121EA) and each of the plurality of negative electrodes of the electrode assembly (121EA). The battery cell (121) may further include an electrolyte.

[0051] The case (121C) may have a roughly rectangular shape, and the first surface (121FS1) and the second surface (121FS2) of the case (121C) may be the widest faces of the case (121C). The first surface (121FS1) and the second surface (121FS2) may be substantially parallel to the electrode assembly (121EA) or at least one of the plurality of positive electrodes and the plurality of negative electrodes included in the electrode assembly (121EA). The first surface (121FS1) and the second surface (121FS2) may be opposite to each other. The first surface (121FS1) and the second surface (121FS2) may extend in a second direction (Y direction) and a third direction (Z direction). The first surface (121FS1) and the second surface (121FS2) may be substantially perpendicular to the first direction (X direction).

[0052] In some embodiments, the cell cover (121F) may cover the upper part (121U) of the battery cell (121). The cell cover (121F) may cover the main surface (121FS1, 121FS2) of the battery cell (121).

[0053] Specifically, the cell cover (121F) may include a first portion (121F_1) covering a first surface (121FS1) and a second portion (121F_2) covering a second surface (121FS2). The cell cover (121F) may include a third portion (121F_3) connected to the first and second portions (121F_1, 121F_2) and covering the upper portion (121U) of the battery cell (121). For example, the first portion (121F_1) and the second portion (121F_2) of the cell cover (121F) may each overlap the battery cell (121) in a first direction (X direction). The first part (121F_1) and the second part (121F_2) of the cell cover (121F) can overlap with the first surface (121FS1) and the second surface (121FS2), respectively, in the first direction (X direction). For example, the third part (121F_3) of the cell cover (121F) can overlap with the battery cell (121) in the third direction (Z direction). The third part (121F_3) of the cell cover (121F) can overlap with the upper part (121U) of the battery cell (121) in the third direction (Z direction). The third direction (Z direction) can intersect with the first direction (X direction) and the second direction (Y direction).

[0054] For example, the cell cover (121F) may include curved portions. The cell cover (121F) may include, for example, two curved portions and, accordingly, may have an approximately n-shaped form, but is not limited thereto. The cell cover (121F) may have a shape deformed from the n-shaped form due to the progress of the process and use after shipment.

[0055] In some embodiments, a third portion (121F_3) of the cell cover (121F) may be spaced apart from the battery cell (121). The third portion (121F_3) may be spaced apart from the battery cell (121) in a third direction (Z direction). For example, the third portion (121F_3) may be spaced apart from the top (121U) of the battery cell (121) in a third direction (Z direction).

[0056] In some embodiments, an air pocket (121AP) may be disposed between one side of the cell cover (121F) and the battery cell (121). Specifically, the air pocket (121AP) may be disposed on the upper part (121U) of the battery cell (121). For example, the air pocket (121AP) may be disposed between the third part (121F_3) of the cell cover (121F) and the upper part (121U) of the battery cell (121). The air pocket (121AP) may be a space where the battery cell (121) and the cell cover (121F) are not disposed.

[0057] In some embodiments, a first portion (121F_1) of the cell cover (121F) may come into contact with a first surface (121FS1). Specifically, the first portion (121F_1) of the cell cover (121F) may come into close contact with the first surface (121FS1). A second portion (121F_2) of the cell cover (121F) may come into contact with a second surface (121FS2). The second portion (121F_2) of the cell cover (121F) may come into close contact with the second surface (121FS2).

[0058] In some embodiments, the first portion (121F_1) of the cell cover (121F) may not completely cover the first surface (121FS1). The first portion (121F_1) of the cell cover (121F) may partially cover the first surface (121FS1). The first portion (121F_1) of the cell cover (121F) may not cover at least a portion of the first surface (121FS1). The first surface (121FS1) may include at least a portion that does not overlap with the cell cover (121F) in the first direction (X direction).

[0059] Likewise, the second part (121F_2) of the cell cover (121F) may not completely cover the second surface (121FS2). The second part (121F_2) of the cell cover (121F) may partially cover the second surface (121FS2). The second part (121F_2) of the cell cover (121F) may not cover at least a portion of the second surface (121FS2). The second surface (121FS2) may include at least a portion that does not overlap with the cell cover (121F) in the first direction (X direction).

[0060] According to some 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. Although the technical concept of the present invention is described herein based on an example in which the battery cell (121) includes a pouch-type battery cell, 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.

[0061] 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.

[0062] 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 (X direction). 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 (X direction).

[0063] 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).

[0064] 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).

[0065] 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.

[0066] 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.

[0067] 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).

[0068] 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.

[0069] As shown in the example of FIG. 2, a receiving portion may be formed only in the second case (121C2) among the first and second cases (121C1, 121C2). Unlike the illustration in FIG. 2, each of the first case (121C1) and the second case (121C2) may include a receiving portion (121R) formed by a pouch forming process.

[0070] 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 (Y direction). 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.

[0071] In this specification, the technical concept of the present invention is described with reference to an example in which the positive terminal (121P) and the negative terminal (121N) of the battery cell (121) are formed on opposite sides. A person skilled in the art will be able to easily arrive at a unidirectional cell based on what is described herein. The positive terminal (121P) and the negative terminal (121N) may be spaced apart in a second direction (Y direction).

[0072] In some embodiments, the cell cover (121F) may include a phase change material (PCM). A phase change material may refer to a material that changes phase while absorbing or releasing heat. For example, the phase change material may change phase by absorbing heat. For example, the phase change material may change phase by releasing heat.

[0073] The cell cover (121F) may be based on negative feedback. Specifically, the cell cover (121F) may act in a direction that lowers the temperature of the battery cell (121) when the temperature rises. Conversely, the cell cover (121F) may act in a direction that raises the temperature of the battery cell (121) when the temperature falls. For example, heat may be transferred between the battery cell (121) and the cell cover (121F).

[0074] In some embodiments, when the battery cell (121) emits heat, the cell cover (121F) may absorb the heat. For example, when the battery cell (121) emits heat, the heat may be transferred to the cell cover (121F) placed adjacent to it. As described above, the cell cover (121F) may include a phase change material, and the phase change material may absorb heat and change phase. For example, it may change phase from solid to liquid or gas, or change phase from liquid to gas. By doing so, the temperature of the battery cell (121) may be lowered.

[0075] For example, if the temperature of the battery cell (121) exceeds a reference temperature, the cell cover (121F) can absorb heat. For example, the cell cover (121F) can absorb heat generated from the battery cell (121) to lower the temperature of the battery cell (121). The reference temperature may be a preset value for the stability of the battery cell (121). Alternatively, the reference temperature may not be a specific value, but may refer to the initial temperature of the battery cell (121).

[0076] In particular, when a thermal runaway event occurs in a battery cell (121), heat may be transferred to an adjacent battery cell (121), and the cell cover (121F) can absorb the heat to delay the heat transfer.

[0077] In other embodiments, the cell cover (121F) may release heat and transfer it to the battery cell (121). As described above, the cell cover (121F) may include a phase change material, and the phase change material may release heat and change phase. For example, it may change phase from gas to liquid or solid, or change phase from liquid to solid. By doing so, the temperature of the battery cell (121) may rise.

[0078] For example, if the temperature of the battery cell (121) is below a reference temperature, the cell cover (121F) can emit heat. For example, the cell cover (121F) can emit heat to raise the temperature of the battery cell (121).

[0079] In some embodiments, as the third portion (121F_3) of the cell cover (121F) is spaced apart from the battery cell (121) rather than being in close contact with it, an air pocket (121AP) may be positioned between the third portion (121F_3) of the cell cover (121F) and the battery cell (121). Heat emitted from the battery cell (121) may be transferred to the air pocket (121AP). For example, heat emitted from the battery cell (121) may be transferred to the air within the air pocket (121AP). Flames and / or gases generated from the battery cell (121) may be transferred to the air pocket (121AP). The heat transferred to the air pocket (121AP) may be transferred back to the cell cover (121F) in contact with it. As previously described, the heat transferred to the cell cover (121F) may be absorbed by a phase change material and undergo a phase change. By doing so, the temperature of the battery cell (121) can be lowered.

[0080] As heat, flame, and / or gas emitted from the battery cell (121) are transferred to the air pocket (121AP) above the battery cell (121), the transfer of said heat, flame, and / or gas to an adjacent battery cell (121) may be delayed. By doing so, safety may be improved.

[0081]

[0082] The cover-cell assembly (122) described with reference to FIGS. 1 and 2 covers a battery cell (121) and may include a cell cover (121F) containing a phase change material. By doing so, the temperature of the cover-cell assembly (122) can be managed by absorbing or releasing heat through a phase change.

[0083] In particular, the cover-cell assembly (122) described with reference to FIGS. 1 and 2 may further include an air pocket (121AP) between the battery cell (121) and the cell cover (121F). By doing so, the transfer of heat, flame, and / or gas to the adjacent battery cell (121) is delayed, thereby improving the safety of the cover-cell assembly (122).

[0084] According to embodiments of the technical concept of the present invention, a cover-cell assembly (122) with enhanced safety can be provided.

[0085] According to embodiments of the technical concept of the present invention, a cover-cell assembly (122) with improved performance and reliability can be provided.

[0086]

[0087] (2nd Example)

[0088] FIG. 3 is a drawing showing a cover-cell assembly (122') according to exemplary embodiments of the technical concept of the present invention. Hereinafter, the differences from the cover-cell assembly (122) described with reference to FIG. 1 and FIG. 2 will be explained.

[0089] Referring to FIG. 3, the cover-cell assembly (122') may include a battery cell (121) and a cell cover (121F') coupled to the battery cell (121). Specifically, the cell cover (121F') may be coupled to the case of the battery cell (121).

[0090] Specifically, the cell cover (121F') may include a first portion (121F'_1) covering a first surface (121FS1) and a second portion (121F'_2) covering a second surface (121FS2). The cell cover (121F') may include a third portion (121F'_3) connected to the first and second portions (121F'_1, 121F'_2) and covering the upper portion (121U) of the battery cell (121).

[0091] For example, the first part (121F'_1) and the second part (121F'_2) of the cell cover (121F') can each overlap with the battery cell (121) in the first direction (X direction). The first part (121F'_1) and the second part (121F'_2) of the cell cover (121F') can each overlap with the first surface (121FS1) and the second surface (121FS2) in the first direction (X direction). For example, the third part (121F'_3) of the cell cover (121F') can overlap with the battery cell (121) in the third direction (Z direction). The third part (121F'_3) of the cell cover (121F') can overlap with the top (121U) of the battery cell (121) in the third direction (Z direction).

[0092] In some embodiments, a third portion (121F'_3) of the cell cover (121F') may be spaced apart from the battery cell (121). The third portion (121F'_3) may be spaced apart from the battery cell (121) in a third direction (Z direction). For example, the third portion (121F'_3) may be spaced apart from the top (121U) of the battery cell (121) in a third direction (Z direction).

[0093] In some embodiments, an air pocket (121AP) may be disposed between one side of the cell cover (121F') and the battery cell (121). Specifically, the air pocket (121AP) may be disposed on the upper part (121U) of the battery cell (121). For example, the air pocket (121AP) may be disposed between the third part (121F'_3) of the cell cover (121F') and the upper part (121U) of the battery cell (121). The air pocket (121AP) may be a space where the battery cell (121) and the cell cover (121F') are not disposed.

[0094] In some embodiments, a first portion (121F'_1) of the cell cover (121F') may come into contact with a first surface (121FS1). Specifically, the first portion (121F'_1) of the cell cover (121F') may come into close contact with the first surface (121FS1). A second portion (121F'_2) of the cell cover (121F') may come into contact with a second surface (121FS2). The second portion (121F'_2) of the cell cover (121F') may come into close contact with the second surface (121FS2).

[0095] In some embodiments, the first portion (121F'_1) of the cell cover (121F') may completely cover the first main surface (121FS1). The first portion (121F'_1) of the cell cover (121F') may cover the first main surface (121FS1) entirely.

[0096] Likewise, the second part (121F'_2) of the cell cover (121F') can completely cover the second surface (121FS2). The second part (121F'_2) of the cell cover (121F') can cover the second surface (121FS2) entirely.

[0097] The cover-cell assembly (122') described with reference to FIG. 3 covers a battery cell (121) and may include a cell cover (121F') containing a phase change material. By doing so, the temperature of the cover-cell assembly (122') can be managed by absorbing or releasing heat through a phase change.

[0098] In particular, the cover-cell assembly (122') described with reference to FIG. 3 may further include an air pocket (121AP) between the battery cell (121) and the cell cover (121F'). By doing so, the transfer of heat, flame, and / or gas to the adjacent battery cell (121) is delayed, thereby improving the safety of the cover-cell assembly (122').

[0099] According to embodiments of the technical concept of the present invention, a cover-cell assembly (122') with enhanced safety can be provided.

[0100] According to embodiments of the technical concept of the present invention, a cover-cell assembly (122') with improved performance and reliability can be provided.

[0101]

[0102] (3rd Example)

[0103] FIG. 4 is an enlarged cross-sectional view showing a part of the configuration of a cover-cell assembly (122) according to exemplary embodiments of the technical concept of the present invention.

[0104] Specifically, FIG. 4 is an enlarged cross-sectional view corresponding to area A of FIG. 1, and is an enlarged cross-sectional view of the cell cover (121FA).

[0105] Referring to FIGS. 1 and FIGS. 4, the cover-cell assembly (122) may include a cell cover (121FA) that covers a battery cell (121).

[0106] In some embodiments, the cell cover (121FA) may be in the form of a pad covering the battery cell (121). Specifically, the cell cover (121FA) may include a pad case (121FA_1) and a phase change material (121FA_2). The phase change material (121FA_2) may be packaged by the pad case (121FA_1). The phase change material (121FA_2) may be surrounded by the pad case (121FA_1) so that it does not leak out of the pad case (121FA_1). In particular, even if the phase of the phase change material (121FA_2) changes by absorbing or releasing heat, it may not leak out of the pad case (121FA_1).

[0107] For example, the pad case (121FA_1) may include one selected from silicone, polyurethane, polypropylene, metal, and stainless steel.

[0108]

[0109] (Fourth Example)

[0110] FIG. 5 is an enlarged cross-sectional view showing a part of the configuration of a cover-cell assembly (122) according to exemplary embodiments of the technical concept of the present invention.

[0111] Specifically, FIG. 5 is an enlarged cross-sectional view corresponding to area A of FIG. 1, and is an enlarged cross-sectional view of the cell cover (121FB).

[0112] Referring to FIGS. 1 and FIGS. 5, the cover-cell assembly (122) may include a cell cover (121FB) that covers a battery cell (121).

[0113] In some embodiments, the cell cover (121FB) may include a coating layer applied on a sheet. Specifically, the cell cover (121FB) may include a sheet covering a battery cell (121) and a coating layer applied on the sheet.

[0114] Specifically, the cell cover (121FB) may include a capsule (121FB_1) containing a phase change material and a binder (121FB_2) mixed with the capsule (121FB_1). The capsule (121FB_1) may include a polymer shell (121FB_11) and a phase change material (121FB_12). The capsule (121FB_1) may be spherical and composed of an internal phase change material (121FB_12) and a polymer shell (121FB_11) surrounding it. The capsule (121FB_1) may be mixed with the binder (121FB_2) and applied to a place to be coated, and the mixture may be dried to form a coating layer. For example, a mixture of capsule (121FB_1) and binder (121FB_2) may be applied to the sheet covering the battery cell (121), and this may be dried to form a cell cover (121FB).

[0115] The phase change material (121FB_12) can be encapsulated by a polymer shell (121FB_11) and may not leak out of the capsule (121FB_1). In particular, even if the phase of the phase change material (121FB_12) changes by absorbing or releasing heat, it may not leak out of the capsule (121FB_1).

[0116] The capsule (121FB_1) may have adhesive and / or fixing power by the binder (121FB_2). For example, the capsule (121FB_1) containing the phase change material (121FB_12) may be adhered to or fixed on the sheet by the binder (121FB_2).

[0117]

[0118] (5th Example)

[0119] FIG. 6 is an enlarged cross-sectional view showing a part of the configuration of a cover-cell assembly (122) according to exemplary embodiments of the technical concept of the present invention.

[0120] Specifically, FIG. 6 is an enlarged cross-sectional view corresponding to area A of FIG. 1, and is an enlarged cross-sectional view of the cell cover (121FC).

[0121] Referring to FIGS. 1 and FIGS. 6, the cover-cell assembly (122) may include a cell cover (121FC) that covers a battery cell (121).

[0122] In some embodiments, the cell cover (121FC) may comprise a laminated form of a plurality of polymer films. Specifically, the cell cover (121FC) may comprise a plurality of first films (121FC_1) and second films (121FC_2) that are alternately laminated. The first film (121FC_1) is a polymer film and may be formed by alternately laminating with a second film (121FC_2) that contains a phase change material. The first film (121FC_1) may not contain a phase change material. In other embodiments, the first film (121FC_1) may contain a phase change material. The second film (121FC_2) may be sealed to prevent leakage of the phase change material.

[0123]

[0124] (6th Example)

[0125] FIG. 7 is an enlarged cross-sectional view showing a part of the configuration of a cover-cell assembly (1222) according to exemplary embodiments of the technical concept of the present invention.

[0126] Specifically, FIG. 7 is an enlarged cross-sectional view corresponding to area A of FIG. 1, and is an enlarged cross-sectional view of the cell cover (121FD).

[0127] Referring to FIGS. 1 and FIGS. 7, the cover-cell assembly (122) may include a cell cover (121FD) that covers a battery cell (121).

[0128] In some embodiments, the cell cover (121FD) may include an outer layer (121FD_1) and an inner layer (121FD_2) in the form of a polymer film. Specifically, the inner layer (121FD_2) may be formed by including a phase change material. For example, the inner layer (121FD_2) may be a polymer film containing a phase change material. The outer layer (121FD_1) may not contain a phase change material and may be a layer for laminating the inner layer (121FD_2). The outer layer (121FD_1) may laminate the phase change material between them to prevent leakage of the phase change material.

[0129]

[0130] (7th Example)

[0131] FIG. 8 is an enlarged cross-sectional view showing a part of the configuration of a cover-cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0132] Specifically, FIG. 8 is an enlarged cross-sectional view corresponding to area A of FIG. 1, and is an enlarged cross-sectional view of the cell cover (121FE).

[0133] Referring to FIGS. 1 and FIGS. 8, the cover-cell assembly (122) may include a cell cover (121FE) that covers a battery cell (121).

[0134] In some embodiments, the cell cover (121FE) may comprise a compound layer (121FE_1) and a phase change material (121FE_2) dispersed within the compound layer (121FE_1). For example, the compound layer (121FE_1) may comprise a high-viscosity grease or paste. The phase change material (121FE_2) may comprise a capsule form.

[0135] Specifically, a compound layer (121FE_1) in which a phase change material (121FE_2) is dispersed may be applied to the outside of a battery pack (100) to form a cell cover (121FE). Due to the compound layer (121FE_1), the phase change material (121FE_2) may not leak. In particular, even if the phase of the phase change material (121FE_2) changes due to absorbing or releasing heat, the phase change material (121FE_2) may not leak.

[0136]

[0137] (8th embodiment)

[0138] FIG. 9 is a drawing showing a battery cell assembly (120) including a cover-cell assembly (122) according to exemplary embodiments of the technical concept of the present invention.

[0139] Referring to FIG. 9, the battery cell assembly (120) may include a plurality of cover-cell assemblies (122_1, 122_2, 122_3, 122_4, 122_5, 122_6, 122_7, 122_8, 122_9, 122_10, 122_11, 122_12, hereinafter, 122_1 to 122_12). Each of the plurality of cover-cell assemblies (122_1 to 122_12) is substantially the same as the cover-cell assembly (122) described with reference to FIG. 1 and FIG. 2.

[0140] A plurality of cover-cell assemblies (122_1 to 122_12) may be arranged in a first direction (X direction). A plurality of cover-cell assemblies (122_1 to 122_12) may be joined, for example, by an adhesive.

[0141] Multiple cover-cell assemblies (122_1 to 122_12) can form multiple banks. For example, cover-cell assemblies (122_1, 122_2, 122_3) can be connected in parallel to form the first bank. Cover-cell assemblies (122_4, 122_5, 122_6) can be connected in parallel to form the second bank. Cover-cell assemblies (122_7, 122_8, 122_9) can be connected in parallel to form the third bank. Cover-cell assemblies (122_10, 122_11, 122_12) can be connected in parallel to form the fourth bank. Multiple banks can be connected in series.

[0142] The resulting connection form of the multiple cover-cell assemblies (122_1 to 122_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 cover-cell assemblies (122_1 to 122_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 (120).

[0143] The battery cell assembly (120) may further include pads, a first integrated circuit assembly, a second integrated circuit assembly, and a Flexible Flat Cable (FFC) assembly.

[0144] The pads can absorb swelling of multiple cover-cell assemblies (122_1 to 122_12). Each of the pads may contain Polyurethane (PU). Each of the pads may contain a refractory material such as silicone.

[0145] 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.

[0146] The first and second integrated circuit assemblies may include physical and functional configurations for providing electrical connections between a plurality of cover-cell assemblies (122_1 to 122_12), outputting the resulting voltage of the plurality of cover-cell assemblies (122_1 to 122_12), and measuring the voltage (or current) of nodes within a circuit composed of the plurality of cover-cell assemblies (122_1 to 122_12).

[0147] The insulating frame may include an insulating material such as plastic. The insulating frame may cover the front of a plurality of cover-cell assemblies (122_1 to 122_12). The insulating frame may support integrated circuits, bus bars, sensing plates, sensing bars, temperature sensors, and wiring.

[0148] Bus bars may be short-circuited to the positive leads (121P) of the cover-cell assemblies (122_1, 122_2) of the first bank and to the negative leads (121N) of one or more cover-cell assemblies (122_11, 122_12) of the last bank. Bus bars may be welded to the positive leads (121P) of the cover-cell assemblies (122_1, 122_2, 122_3) of the first bank and to the negative leads (121N) of one or more cover-cell assemblies (122_10, 122_11, 122_12) of the last bank. The resulting voltage of a plurality of cover-cell assemblies (122_1 to 122_12) of the battery cell assembly (120) may be output through the bus bars. Bus bars may be fixed to an insulating frame.

[0149] The integrated circuit can be mounted on an insulating frame. Positive leads (121P) and negative leads (121N) welded to each other can form nodes inside the battery cell assembly (120). The integrated circuit can be configured to measure the voltage of the nodes through sensing plates and sensing bars.

[0150] The sensing bars may include a conductive material. The sensing bars may have a rod shape. The sensing bars may be short-circuited to the bus bars. The sensing bars may be coupled to the bus bars. Through the sensing bars, the voltage of the bus bars can be measured.

[0151] Each of the plurality of sensing plates may have a patch shape or a pad shape. The plurality of sensing plates may include a conductive material. The plurality of sensing plates may be short-circuited to corresponding positive leads (121P) and negative leads (121N) of the plurality of cover-cell assemblies (122_1 to 122_12).

[0152] Each of the multiple sensing plates can be connected to an integrated circuit. Through the multiple sensing plates, the voltage of multiple nodes inside the battery cell assembly (120) can be measured.

[0153] Temperature sensors may be configured to measure the temperature at multiple points of the battery cell assembly (120). The temperature sensors may be spatially arranged, and accordingly, the temperature distribution within the battery cell assembly (120) may be measured.

[0154] The insulating cover may include an insulating material such as plastic. The insulating cover may be fitted into an insulating frame. The insulating cover may cover an integrated circuit, bus bars, sensing plates, sensing bars, and temperature sensors, and accordingly, the electrical elements of the first and second integrated circuit assemblies may be protected.

[0155] The battery cell assembly (120) described with reference to FIG. 9 may include a plurality of cover-cell assemblies (122) each covering a battery cell (121) and including a cell cover (121F) containing a phase change material. By doing so, the temperature of the battery cell assembly (120) can be managed by absorbing or releasing heat through phase change.

[0156] According to embodiments of the technical concept of the present invention, a battery cell assembly (120) with enhanced safety can be provided.

[0157] According to embodiments of the technical concept of the present invention, a battery cell assembly (120) with improved performance and reliability can be provided.

[0158]

[0159] (9th Example)

[0160] FIG. 10 is a drawing showing a battery pack (100) including a cover-cell assembly (122) according to exemplary embodiments of the technical concept of the present invention.

[0161] FIG. 11 is a drawing showing a battery pack (100) including a cover-cell assembly (122) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 11 is a cross-sectional view along line XX of FIG. 10.

[0162] Referring to FIGS. 10 and 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.

[0163] 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).

[0164] Here, the first direction (X direction) and the second direction (Y direction) 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 (Z direction) may be substantially perpendicular to the mounting surface of the base plate (111).

[0165] 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 (X direction). 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).

[0166] 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.

[0167] The center beam (116) may be extended in a first direction (X direction). 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.

[0168] The cross beams (117) can be extended in a second direction (Y direction). The cross beams (117) can be interposed between the side walls (114, 115).

[0169] 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 (X direction). The plurality of cooling channels may be spaced apart in a second direction (Y direction).

[0170] 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).

[0171] The battery cell assembly (120) may further include a plurality of battery cells (121) arranged in a first direction (X direction) and a pad (not shown) arranged between the plurality of battery cells (121). The pad is arranged between the plurality of battery cells (121) in the first direction (X direction) and may overlap with the plurality of battery cells (121) in the first direction (X direction).

[0172] The pad can absorb swelling of multiple battery cells (121). The pad may include an elastic material. The pad may include PU (Polyurethane). The pad may also include a fire-resistant material.

[0173] The battery cell assembly (120) may further include a cell cover (121F) that covers each of a plurality of battery cells (121). As described above, the cell cover (121F) may include a phase change material.

[0174] The battery pack (100) may further include a pack lead (119) coupled to the side walls (112, 113, 114, 115) of the pack housing (110). The pack lead (119) may cover elements mounted inside the battery pack (100), such as a plurality of battery cell assemblies (120) and electrical components. The pack lead (119) may be secured to the pack housing (110) by mechanical coupling means, such as bolting.

[0175] In FIG. 10, 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. 10 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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).

[0180] The battery pack (100) described with reference to FIGS. 10 and 11 may include a plurality of battery cell assemblies (120) each comprising a plurality of cover-cell assemblies (122) that cover a battery cell (121) and include a cell cover (121F) containing a phase change material. By doing so, the temperature of the battery pack (100) can be managed by absorbing or releasing heat through phase change.

[0181] According to embodiments of the technical concept of the present invention, a battery pack (100) with enhanced safety can be provided.

[0182] According to embodiments of the technical concept of the present invention, a battery pack (100) with improved performance and reliability can be provided.

[0183]

[0184] 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. An electrode assembly comprising an anode and a cathode stacked in a first direction; A case accommodating the above electrode assembly; A cell cover coupled to the above case; and It includes an air pocket between one side of the cell cover and the case, A cover-cell assembly characterized in that the cell cover comprises a phase change material (PCM).

2. In Paragraph 1, The electrode assembly and the case above constitute a battery cell, and The cell cover comprises a first portion that overlaps the main surface of the battery cell in the first direction and a second portion that is connected to the first portion and overlaps the battery cell in a second direction intersecting the first direction. The above air pocket is positioned between the battery cell and the second part of the cell cover, and A cover-cell assembly characterized in that the main surface of the battery cell and the first portion of the cell cover are in close contact.

3. In Paragraph 2, A cover-cell assembly characterized in that the first portion of the cell cover completely covers the main surface of the battery cell.

4. In Paragraph 2, A cover-cell assembly characterized in that the first portion of the cell cover does not cover at least a portion of the main surface of the battery cell.

5. In Paragraph 1, A cover-cell assembly characterized in that the above case and the above cell cover are spaced apart in a second direction intersecting a first direction.

6. In Paragraph 1, A cover-cell assembly characterized in that the cell cover comprises a pad case and a phase change material packaged by the pad case.

7. In Paragraph 6, A cover-cell assembly characterized in that the pad case comprises one selected from silicone, polyurethane, polypropylene, metal, and stainless steel.

8. In Paragraph 1, The cell cover comprises a sheet and a coating layer applied on the sheet, and A cover-cell assembly characterized in that the coating layer comprises a capsule containing the phase change material and a binder mixed with the capsule.

9. In Paragraph 1, A cover-cell assembly characterized in that the cell cover comprises a polymer film that seals the phase change material.

10. In Paragraph 1, A cover-cell assembly characterized in that the cell cover comprises a thermal conductive compound layer and a capsule containing the phase change material dispersed within the thermal conductive compound layer.

11. Pack Housing; A plurality of battery cells arranged in a first direction within the above-mentioned pack housing; and It includes a plurality of cell covers coupled to corresponding ones among the plurality of battery cells above, and The first portion of each of the plurality of cell covers is in close contact with the main surface of the plurality of battery cells in the first direction, and The second portion of each of the plurality of cell covers is spaced apart from the upper portion of the plurality of battery cells and in a second direction intersecting the first direction, and A battery pack characterized in that the cell cover comprises a phase change material (PCM).

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