Cap-cell assembly, battery cell assembly comprising cap-cell assembly, and battery pack comprising cap-cell assembly

Abstract

In accordance with an exemplary embodiment of the present invention, a cover-cell assembly is provided. The cover-cell assembly includes: an electrode assembly including a positive electrode and a negative electrode stacked in a first direction; a case accommodating the electrode assembly; a battery cell cover, wherein the battery cell cover is connected to the shell; and an air bag between one surface of the battery cell cover and the shell, and the battery cell cover comprises a phase change material (PCM).

Description

Technical Field

[0001] This disclosure relates to a cover-cell assembly, a battery cell assembly including the cover-cell assembly, and a battery pack including the cover-cell assembly.

[0002] This application claims the benefit of Korean Patent Application No. 10-2024-0093498, filed on July 6, 2024, the disclosure of which is incorporated herein by reference. Background Technology

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as a power source for various wireless devices, such as mobile phones, laptops, and cordless vacuum cleaners. Recently, the manufacturing cost per unit capacity of secondary batteries has decreased significantly due to improvements in energy density and economies of scale. As the cruising range of battery electric vehicles (BEVs) has increased to levels comparable to fuel cell vehicles, the primary application of secondary batteries is shifting from mobile devices to mobility vehicles.

[0004] The technological development trend of secondary batteries in mobility applications focuses on improving energy density and safety. Secondary batteries are crucial for the safety of mobility vehicles because they directly impact passengers' lives. The safety of secondary batteries can be achieved through mechanical robustness, reliable electrical insulation, and delaying heat transfer during thermal runaway events. Summary of the Invention

[0005] Technical issues

[0006] The technical problem solved by the present invention is to provide a cover-cell assembly with enhanced security.

[0007] The technical problem solved by the present invention is to provide a cover-cell assembly with improved performance and reliability.

[0008] The technical problem solved by the present invention is to provide a battery cell assembly with enhanced safety.

[0009] The technical problem sought to be solved by the present invention is to provide a battery cell assembly with improved performance and reliability.

[0010] The technical problem solved by the present invention is to provide a battery pack with enhanced safety.

[0011] The technical problem solved by the present invention is to provide a battery pack with improved performance and reliability.

[0012] Technical solution

[0013] According to an exemplary embodiment of this disclosure for solving the above-mentioned problems, a cover-cell assembly is provided. The cover-cell assembly includes: an electrode assembly including a positive electrode and a negative electrode stacked along a first direction; a housing housing the electrode assembly; a cell cover coupled to the housing; and an air bag between one surface of the cell cover and the housing, wherein the cell cover includes a phase change material (PCM).

[0014] The electrode assembly and the housing constitute a battery cell, wherein the cell cover includes a first part and a second part, the first part overlapping the main surface of the battery cell in a first direction, and the second part connecting to the first part and overlapping the battery cell in a second direction intersecting the first direction, wherein the air bag is disposed between the battery cell and the second part of the cell cover, and the main surface of the battery cell and the first part of the cell cover can be in close contact.

[0015] The first portion of the cell cover can completely cover the main surface of the battery cell.

[0016] The first portion of the cell cover may not cover at least a portion of the main surface of the battery cell.

[0017] The housing and the cell cover may be spaced apart in a second direction that intersects the first direction.

[0018] The cell cover may include a housing and a phase change material encapsulated by the housing.

[0019] The pad housing may include one selected from silicone, polyurethane, polypropylene, metal, and stainless steel.

[0020] The cell cover includes a sheet and a coating applied to the sheet, wherein the coating may include a capsule containing the phase change material and an adhesive mixed with the capsule.

[0021] The cell cover may include a polymer film that seals the phase change material.

[0022] The cell cover may include a thermally conductive composite layer and a capsule containing the phase change material dispersed within the thermally conductive composite layer.

[0023] According to an exemplary embodiment of this disclosure for solving the above-mentioned problems, a battery pack is provided. The battery pack includes: a battery pack housing; a plurality of battery cells arranged within the battery pack housing along a first direction; and a plurality of cell covers coupled to corresponding battery cells among 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 portion of the plurality of battery cells in a second direction intersecting the first direction, and the cell cover may include a phase change material (PCM).

[0024] Beneficial effects

[0025] According to exemplary embodiments of this disclosure, a cover-cell assembly with enhanced security can be provided.

[0026] According to exemplary embodiments of this disclosure, a cover-cell assembly with improved performance and reliability can be provided.

[0027] According to exemplary embodiments of this disclosure, a battery cell assembly with enhanced safety can be provided.

[0028] According to exemplary embodiments of this disclosure, battery cell assemblies with improved performance and reliability can be provided.

[0029] According to exemplary embodiments of this disclosure, a battery pack with enhanced safety can be provided.

[0030] According to exemplary embodiments of this disclosure, battery packs with enhanced performance and reliability can be provided.

[0031] The effects obtainable from the exemplary embodiments of this disclosure are not limited to those described above, and other effects not mentioned can be clearly obtained and understood by those skilled in the art to which the exemplary embodiments of this disclosure pertain. In other words, unintended effects of practicing the exemplary embodiments of this disclosure can also be derived by those skilled in the art from the exemplary embodiments of this disclosure. Attached Figure Description

[0032] Figure 1 This is a diagram illustrating an exemplary embodiment of a cover-cell assembly based on the technical concept of this disclosure.

[0033] Figure 2 This is an exploded perspective view of a battery cell in a cover-cell assembly according to an exemplary embodiment of the technical concept based on the present disclosure.

[0034] Figure 3This is a diagram illustrating an exemplary embodiment of a cover-cell assembly based on the technical concept of this disclosure.

[0035] Figure 4 This is an enlarged cross-sectional view showing a partial configuration of a cover-cell assembly according to an exemplary embodiment based on the technical concept of this disclosure.

[0036] Figure 5 This is an enlarged cross-sectional view showing a partial configuration of a cover-cell assembly according to an exemplary embodiment based on the technical concept of this disclosure.

[0037] Figure 6 This is an enlarged cross-sectional view showing a partial configuration of a cover-cell assembly according to an exemplary embodiment based on the technical concept of this disclosure.

[0038] Figure 7 This is an enlarged cross-sectional view showing a partial configuration of a cover-cell assembly according to an exemplary embodiment based on the technical concept of this disclosure.

[0039] Figure 8 This is an enlarged cross-sectional view showing a partial configuration of a cover-cell assembly according to an exemplary embodiment based on the technical concept of this disclosure.

[0040] Figure 9 This is a diagram illustrating a battery cell assembly including a cover-cell assembly according to an exemplary embodiment based on the technical concept of this disclosure.

[0041] Figure 10 This is a diagram illustrating a battery pack including a cover-cell assembly according to an exemplary embodiment based on the technical concept of this disclosure.

[0042] Figure 11 This is a diagram illustrating a battery pack including a cover-cell assembly according to an exemplary embodiment based on the technical concept of this disclosure. Detailed Implementation

[0043] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that the terms and words used in this specification and claims should not be construed as having their ordinary or dictionary meaning, but rather as having meanings and concepts consistent with the technical spirit of the present disclosure. This is based on the principle that the inventor can define the concepts of terms as he deems appropriate to best describe his disclosure.

[0044] Therefore, it should be understood that the embodiments described herein and the configurations shown in the accompanying drawings are merely the most preferred embodiments of this disclosure and are not an exhaustive list of the technical ideas of this disclosure, and various equivalents and modifications that can replace them may exist at the time of submission.

[0045] Furthermore, in describing this disclosure, specific descriptions of relevant known configurations or features have been omitted, where such detailed descriptions would obscure the essence of this disclosure.

[0046] Because embodiments of this disclosure are provided to explain this disclosure more fully to those skilled in the art, the shapes and dimensions of components in the drawings may be exaggerated, omitted, or shown schematically for clarity. Therefore, the dimensions or proportions of each component do not necessarily represent their actual dimensions or proportions.

[0047] (First Implementation)

[0048] Figure 1 This is a diagram illustrating a cover-cell assembly 122 according to an exemplary embodiment based on the technical concept of this disclosure.

[0049] Figure 2 This is an exploded perspective view of a battery cell 121 of a cover-cell assembly 122 according to an exemplary embodiment based on the technical concept of this disclosure.

[0050] Reference Figure 1 and Figure 2 The cover-cell assembly 122 may include a battery cell 121 and a cell cover 121F connected to the battery cell 121. Specifically, the cell cover 121F may be connected to the housing 121C of the battery cell 121.

[0051] In some embodiments, battery cell 121 may include an electrode assembly 121EA, a housing 121C containing the electrode assembly 121EA, and positive terminals 121P and negative terminals 121N. The electrode assembly 121EA includes a positive and a negative electrode arranged in a first direction (X direction), and the positive terminal 121P and the negative terminal 121N protrude 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 terminals and each of the plurality of negative terminals of the electrode assembly 121EA. Battery cell 121 may also include an electrolyte.

[0052] The housing 121C may have a generally rectangular prism shape, and the first main surface 121FS1 and the second main surface 121FS2 of the housing 121C may be the widest surfaces of the housing 121C. The first main surface 121FS1 and the second main surface 121FS2 may be substantially parallel to the electrode assembly 121EA or at least one of a plurality of positive electrodes and a plurality of negative electrodes included in the electrode assembly 121EA. The first main surface 121FS1 and the second main surface 121FS2 may be opposite to each other. The first main surface 121FS1 and the second main surface 121FS2 may extend in a second direction (Y direction) and a third direction (Z direction). The first main surface 121FS1 and the second main surface 121FS2 may be substantially perpendicular to the first direction (X direction).

[0053] 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 surfaces 121FS1 and 121FS2 of the battery cell 121.

[0054] Specifically, the cell cover 121F may include a first portion 121F_1 covering a first main surface 121FS1 and a second portion 121F_2 covering a second main surface 121FS2. The cell cover 121F may include a third portion 121F_3, which connects to the first portion 121F_1 and the second portion 121F_2 and covers 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 with the battery cell 121 in a first direction (X direction). The first portion 121F_1 and the second portion 121F_2 of the cell cover 121F may each overlap with the first main surface 121FS1 and the second main surface 121FS2 in a first direction (X direction). For example, the third portion 121F_3 of the cell cover 121F may overlap with the battery cell 121 in a 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).

[0055] For example, the cell cover 121F may also have a curved portion. The cell cover 121F may, for example, include two curved portions, and thus may have an approximately n-shaped structure, but is not limited thereto. The cell cover 121F may also have a shape that deforms from the n-shape due to the process and use after transportation.

[0056] In some embodiments, the 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 the third direction (Z direction). For example, the third portion 121F_3 may be spaced apart from the upper portion 121U of the battery cell 121 in the third direction (Z direction).

[0057] In some embodiments, an air bag 121AP may be disposed between one surface of the cell cover 121F and the battery cell 121. Specifically, the air bag 121AP may be vertically positioned on the upper portion 121U of the battery cell 121. For example, the air bag 121AP may be disposed between the third portion 121F_3 of the cell cover 121F and the upper portion 121U of the battery cell 121. The air bag 121AP may be located in the space where the battery cell 121 and the cell cover 121F are not disposed.

[0058] In some embodiments, the first portion 121F_1 of the cell cover 121F can contact the first main surface 121FS1. Specifically, the first portion 121F_1 of the cell cover 121F can be in close contact with the first main surface 121FS1. The second portion 121F_2 of the cell cover 121F can contact the second main surface 121FS2. The second portion 121F_2 of the cell cover 121F can be in close contact with the second main surface 121FS2.

[0059] In some embodiments, the first portion 121F_1 of the cell cover 121F may not completely cover the first main surface 121FS1. The first portion 121F_1 of the cell cover 121F may partially cover the first main surface 121FS1. The first portion 121F_1 of the cell cover 121F may not cover at least a portion of the first main surface 121FS1. The first main surface 121FS1 may include at least a portion that does not overlap with the cell cover 121F in a first direction (X direction).

[0060] Similarly, the second portion 121F_2 of the cell cover 121F may not completely cover the second main surface 121FS2. The second portion 121F_2 of the cell cover 121F may partially cover the second main surface 121FS2. The second portion 121F_2 of the cell cover 121F may not cover at least a portion of the second main surface 121FS2. The second main surface 121FS2 may include at least a portion that does not overlap with the cell cover 121F in the first direction (X direction).

[0061] According to some embodiments, battery cell 121 may include one of a cylindrical battery cell, a prismatic battery cell, and a pouch battery cell. The electrode assembly of the cylindrical battery cell is embedded within a cylindrical metal can. The electrode assembly of the prismatic battery cell is embedded within a prismatic metal can. The electrode assembly of the pouch battery cell is embedded within a pouch-shaped housing including an aluminum laminate. In this specification, the technical concept of the present disclosure is described based on the example of battery cell 121 including a pouch battery cell. However, based on the description herein, those skilled in the art will readily obtain examples in which battery cell 121 includes a cylindrical or prismatic battery cell.

[0062] Electrode assembly 121EA may include a positive electrode, a negative electrode, and a separator inserted between the positive and negative electrodes. Electrode assembly 121EA may be of the wound type or the laminated type. Wound type electrode assembly 121EA may include a wound structure of positive electrode, negative electrode, and separator inserted between them. Laminated type electrode assembly 121EA may include multiple positive electrodes, multiple negative electrodes, and multiple separators inserted between them in sequence.

[0063] In the stacked electrode assembly 121EA, multiple positive electrodes and multiple negative electrodes can be arranged along a first direction (X direction). In the stacked electrode assembly 121EA, multiple positive electrodes and multiple negative electrodes can be stacked along the first direction (X direction).

[0064] Each of the plurality of positive electrodes of electrode assembly 121EA may include a positive electrode tab (not shown). The positive electrode tab (not shown) of each of the plurality of positive electrodes of electrode assembly 121EA may be short-circuited to the positive terminal 121P. The positive electrode tab (not shown) of each of the plurality of positive electrodes of electrode assembly 121EA may be soldered to the positive terminal 121P.

[0065] Each of the plurality of negative electrodes of electrode assembly 121EA may include a negative electrode tab 121NT. The negative terminal 121NT of each of the plurality of negative electrodes of electrode assembly 121EA may be short-circuited with the negative terminal 121N. The negative terminal 121NT of each of the plurality of negative electrodes of electrode assembly 121EA may be soldered to the negative terminal 121N.

[0066] The housing 121C may include an inner resin layer, a metal layer, and an outer resin layer. An adhesive and an anti-corrosion layer may also be provided between the inner resin layer and the metal layer, and between the outer resin layer and the metal layer.

[0067] The inner resin layer can have heat-sealing properties and can be referred to as a sealant layer. The inner resin layer can seal the housing 121C. The inner resin layer can include, for example, polyolefin-based resins such as polypropylene (PP) and polyethylene (PE). The metal layer can include any one of an alloy of iron, carbon, chromium, and manganese, an alloy of iron, chromium, and nickel, and aluminum. The metal layer can be a gas barrier layer. The metal layer can block the passage of gas through the housing 121C. The outer resin layer can be a surface protection layer. The outer resin layer can include a material having abrasion resistance and heat resistance, such as a nylon resin.

[0068] The housing 121C can be provided by joining a first housing 121C1 and a second housing 121C2. In this example, the first housing 121C1 can be substantially flat. Additionally, the first housing 121C1 may not have a receiving portion. The second housing 121C2 can include a receiving portion 121R. The receiving portion 121R can be formed by a bag molding process. The receiving portion 121R is a portion of the second housing 121C2 that is formed into a bowl shape for receiving the electrode assembly 121EA.

[0069] The stepped portion 121T of the second housing 121C2 can surround the receiving portion 121R. The stepped portion 121T of the second housing 121C2 can be joined to the edge of the first housing 121C1, thereby providing the housing 121C.

[0070] As Figure 2 shown in the example, the receiving portion can be formed only in the second housing 1 within the first housing 121C1 and the second housing 121C2. Different from Figure 2 shown, each of the first housing 121C and the second housing 121C can also include a receiving portion 121R formed by a bag molding process.

[0071] An insulating tape 121I can be applied to the positive terminal 121P and the negative terminal 121N. The positive terminal 121P and the negative terminal 121N can protrude to the outside of the housing 121C. The positive terminal 121P and the negative terminal 121N can protrude from the housing 121C in the second direction (Y direction). Therefore, the voltage and current of the resulting battery cell 121 can be output through the positive terminal 121P and the negative terminal 121N. The positive terminal 121P can be a positive lead. The negative terminal 121N can be a negative lead.

[0072] In this specification, the example of a bipolar cell is mainly used to explain the technical concept of the present disclosure, in which the positive terminal 121P and the negative terminal 121N of the battery cell 121 are formed on opposite sides. Based on the description herein, those skilled in the art will easily obtain a unipolar cell. The positive terminal and the negative terminal 121N can be spaced apart in the second direction (Y direction).

[0073] In some embodiments, the cell cover 121F may include a phase change material (PCM). A phase change material can be a material that undergoes a phase change while absorbing or releasing heat. For example, a phase change material can absorb heat and change its phase state. For example, a phase change material can release heat and change its phase state.

[0074] The cell cover 121F can be based on negative feedback. Specifically, when the temperature of the battery cell 121 rises, the cell cover 121F can be used to lower the temperature of the battery cell 121. Conversely, when the temperature of the battery cell 121 falls, the cell cover 121F can be used to raise the temperature of the battery cell 121. For example, heat can be transferred between the battery cell 121 and the cell cover 121F.

[0075] In some embodiments, when the battery cell 121 releases heat, the cell cover 121F can absorb the heat. For example, when the battery cell 121 releases heat, the heat can be transferred to the cell cover 121F located nearby. As described above, the cell cover 121F may include a phase change material, and this phase change material can absorb heat and undergo a phase change. For example, it can change the phase from solid to liquid or gas, or from liquid to gas. This may result in a decrease in the temperature of the battery cell 121.

[0076] For example, if the temperature of battery cell 121 exceeds a reference temperature, cell cover 121F can absorb heat. For instance, cell cover 121F can absorb heat generated by battery cell 121, thereby lowering the temperature of battery cell 121. The reference temperature can be a preset value for the stability of battery cell 121. Alternatively, the reference temperature may not be a specific value, but may represent the initial temperature of battery cell 121.

[0077] Specifically, if a thermal runaway event occurs in battery cell 121, heat can be transferred to adjacent battery cells 121. The cell cover 121F can absorb this heat, thereby delaying heat transfer.

[0078] In other embodiments, the cell cover 121F can release heat and transfer it to the battery cell 121. As described above, the cell cover 121F may include a phase change material, and this phase change material can release heat and undergo a phase change. For example, it can change the phase from gas to liquid or solid, or from liquid to solid. This may cause the temperature of the battery cell 121 to rise.

[0079] For example, if the temperature of battery cell 121 is lower than a reference temperature, cell cover 121F can release heat. For example, cell cover 121F can release heat to raise the temperature of battery cell 121.

[0080] In some embodiments, the third portion 121F_3 of the cell cover 121F is spaced apart from, rather than in close contact with, the battery cell 121, so that an air bag 121AP can be disposed between the third portion 121F_3 of the cell cover 121F and the battery cell 121. Heat released from the battery cell 121 can be transferred to the air bag 121AP. For example, heat released from the battery cell 121 can be transferred to the air inside the air bag 121AP. Flame and / or gas generated from the battery cell 121 can be transferred to the air bag 121AP. The heat transferred to the air bag 121AP can be further transferred to the cell cover 121F in contact with it. A phase change material can absorb the heat transferred to the cell cover 121F and undergo a phase change, as described above. This can reduce the temperature of the battery cell 121.

[0081] When heat, flame, and / or gas released from battery cell 121 is transferred to the air pocket 121AP at the top of battery cell 121, the transfer of heat, flame, and / or gas to adjacent battery cells 121 can be delayed. This can improve safety.

[0082] refer to Figure 1 and Figure 2 The described cover-cell assembly 122 covers the battery cell 121 and may include a cell cover 121F containing a phase change material. This allows the temperature of the cover-cell assembly 122 to be managed by absorbing or releasing heat through phase change.

[0083] Specifically, refer to Figure 1 and Figure 2 The described cover-cell assembly 122 may further include an air pocket 121AP between the battery cell 121 and the cell cover 121F. This can delay the transfer of heat, flame, and / or gas to the adjacent battery cell 121, thereby improving the safety of the cover-cell assembly 122.

[0084] According to embodiments based on the technical concept of this disclosure, a cover-cell assembly 122 with enhanced security can be provided.

[0085] According to embodiments based on the technical concept of this disclosure, a cover-cell assembly 122 with improved performance and reliability can be provided.

[0086] (Second Implementation)

[0087] Figure 3 This is a figure illustrating an exemplary embodiment of a cover-cell assembly 122' based on the technical concept of this disclosure. In the following description, the focus will be primarily on the references... Figure 1 and Figure 2 The difference described is between the cover-cell assembly 122.

[0088] Reference Figure 3 The cover-cell assembly 122' may include a battery cell 121 and a cell cover 121F' connected to the battery cell 121. Specifically, the cell cover 121F' may be connected to the housing of the battery cell 121.

[0089] Specifically, the cell cover 121F' may include a first portion 121F'_1 covering the first main surface 121FS1 and a second portion 121F'_2 covering the second main surface 121FS2. The cell cover 121F' may include a third portion 121F'_3, which is connected to the first portion 121F'_1 and the second portion 121F'_2 and covers the upper part 121U of the battery cell 121.

[0090] For example, the first portion 121F'_1 and the second portion 121F'_2 of the cell cover 121F' can each overlap with the battery cell 121 in a first direction (X direction). The first portion 121F'_1 and the second portion 121F'_2 of the cell cover 121F' can each overlap with the first main surface 121FS1 and the second main surface 121FS2 in a first direction (X direction). For example, the third portion 121F'_3 of the cell cover 121F' can overlap with the battery cell 121 in a third direction (Z direction). The third portion 121F'_3 of the cell cover 121F' can overlap with the upper part 121U of the battery cell 121 in a third direction (Z direction).

[0091] In some embodiments, the 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 the third direction (Z direction). For example, the third portion 121F'_3 may be spaced apart from the upper portion 121U of the battery cell 121 in the third direction (Z direction).

[0092] In some embodiments, an air bag 121AP may be disposed between one surface of the cell cover 121F' and the battery cell 121. Specifically, the air bag 121AP may be arranged on the upper portion 121U of the battery cell 121. For example, the air bag 121AP may be disposed between the third portion 121F'_3 of the cell cover 121F' and the upper portion 121U of the battery cell 121. The air bag 121AP may be a space where the battery cell 121 and the cell cover 121F' are not disposed.

[0093] In some embodiments, the first portion 121F'_1 of the cell cover 121F' can contact the first main surface 121FS1. Specifically, the first portion 121F'_1 of the cell cover 121F' can be in close contact with the first main surface 121FS1. The second portion 121F'_2 of the cell cover 121F' can contact the second main surface 121FS2. The second portion 121F'_2 of the cell cover 121F' can be in close contact with the second main surface 121FS2.

[0094] In some embodiments, the first portion 121F'_1 of the cell cover 121F' can completely cover the first main surface 121FS1. The first portion 121F'_1 of the cell cover 121F' can cover the entire first main surface 121FS1.

[0095] Similarly, the second portion 121F'_2 of the cell cover 121F' can completely cover the second main surface 121FS2. The second portion 121F'_2 of the cell cover 121F' can cover the entire second main surface 121FS2.

[0096] refer to Figure 3 The described cover-cell assembly 122' covers the battery cell 121 and may include a cell cover 121F' containing a phase change material. This enables temperature management of the cover-cell assembly 122' through the absorption or release of heat via phase change.

[0097] Specifically, refer to Figure 3 The described cover-cell assembly 122' may further include an air pocket 121AP between the battery cell 121 and the cell cover 121F'. This can delay the transfer of heat, flame, and / or gas to the adjacent battery cell 121, thereby improving the safety of the cover-cell assembly 122'.

[0098] According to embodiments based on the technical concept of this disclosure, a cover-cell assembly 122' with enhanced security can be provided.

[0099] According to embodiments based on the technical concept of this disclosure, a cover-cell assembly 122' with improved performance and reliability can be provided.

[0100] (Third implementation method)

[0101] Figure 4 This is an enlarged cross-sectional view showing a portion of the construction of a cover-cell assembly 122 according to an exemplary embodiment based on the technical concept of this disclosure.

[0102] Specifically, Figure 4 Is with Figure 1 The enlarged cross-sectional view corresponding to region A in the diagram shows the enlarged cross-sectional view of the cell cover 121FA.

[0103] Reference Figure 1 and Figure 4 The cover-cell assembly 122 may include a cell cover 121FA covering the battery cell 121.

[0104] 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 housing 121FA_1 and a phase change material 121FA_2. The phase change material 121FA_2 may be encapsulated by the pad housing 121FA_1. The phase change material 121FA_2 may be surrounded by the pad housing 121FA_1 and prevented from leaking to the outside of the pad housing 121FA_1. Specifically, even if the phase of the phase change material 121FA_2 changes by absorbing or releasing heat, it will not leak to the outside of the pad housing 121FA_1.

[0105] For example, the pad housing 121FA_1 may include one selected from silicone, polyurethane, polypropylene, metal and stainless steel.

[0106] (Fourth Implementation)

[0107] Figure 5 This is an enlarged cross-sectional view showing a portion of the construction of a cover-cell assembly 122 according to an exemplary embodiment based on the technical concept of this disclosure.

[0108] Specifically, Figure 5 This is an enlarged cross-sectional view of the 121FB cell cover, and... Figure 1 Enlarged cross-sectional view of region A.

[0109] Reference Figure 1 and Figure 5 The cover-cell assembly 122 may include a cell cover 121FB that covers the battery cell 121.

[0110] In some embodiments, the cell cover 121FB may include a coating applied to a sheet. Specifically, the cell cover 121FB may include a sheet covering the battery cell 121 and a coating applied to the sheet.

[0111] Specifically, the cell cover 121FB may include a capsule 121FB_1, which contains a phase change material and an adhesive 121FB_2 mixed with the capsule 121FB_1. The capsule 121FB_1 may include a polymer shell 121FB_11 and the phase change material 121FB_12. The capsule 121FB_1 may be spherical and includes an internal phase change material 121FB_12 and a surrounding polymer shell 121FB_11. The capsule 121FB_1 may be mixed with the adhesive 121FB_2 and applied to the area to be coated, and the mixture may be dried to form a coating. For example, a mixture of capsule 121FB_1 and adhesive 121FB_2 may be applied to a sheet covering the battery cell 121, which may be dried to form the cell cover 121FB.

[0112] The phase change material 121FB_12 can be encapsulated by a polymer shell 121FB_11 and is prevented from leaking to the outside of the capsule 121FB_1. Specifically, even if the phase of the phase change material 121FB_12 changes by absorbing or releasing heat, it will not leak to the outside of the capsule 121FB_1.

[0113] Due to the adhesive 121FB_2, the capsule 121FB_1 can have adhesive and / or retaining forces. For example, the capsule 121FB_1 containing the phase change material 121FB_12 can be adhered or fixed to a sheet by the adhesive 121FB_2.

[0114] (Fifth Implementation)

[0115] Figure 6 This is an enlarged cross-sectional view showing a portion of the construction of a cover-cell assembly 122 according to an exemplary embodiment based on the technical concept of this disclosure.

[0116] Specifically, Figure 6 It corresponds to Figure 1 The enlarged cross-sectional view of region A in the figure shows the enlarged cross-sectional view of the cell cover 121FC.

[0117] Reference Figure 1 and Figure 6 The cover-cell assembly 122 may include a cell cover 121FC covering the battery cell 121.

[0118] In some embodiments, the cell cover 121FC may comprise a laminate of multiple polymer films. Specifically, the cell cover 121FC may comprise a plurality of alternatingly stacked first films 121FC_1 and second films 121FC_2. The first films 121FC_1 are polymer films and can be formed by alternating lamination with second films 121FC_2 comprising a phase change material. The first films 121FC_1 may not contain a phase change material. In other embodiments, the first films 121FC_1 may include a phase change material. The second films 121FC_2 may be sealed to prevent leakage of the phase change material.

[0119] (Sixth Implementation Method)

[0120] Figure 7 This is an enlarged cross-sectional view showing a partial structure of a cover-cell assembly 1222 according to an exemplary embodiment based on the technical concept of this disclosure.

[0121] Specifically, Figure 7 Is with Figure 1 The enlarged cross-sectional view corresponding to region A in the diagram shows the enlarged cross-sectional view of the cell cover 121FD.

[0122] Reference Figure 1 and Figure 7 The cover-cell assembly 122 may include a cell cover 121FD covering the battery cell 121.

[0123] 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 to include a phase change material. For example, the inner layer 121FD_2 may be a polymer film including a phase change material. The outer layer 121FD_1 does not include a phase change material and may act as a layer for laminating the inner layer 121FD_2. The outer layer 121FD_1 can prevent leakage of the phase change material by laminating the phase change material between them.

[0124] (Seventh Implementation)

[0125] Figure 8 This is an enlarged cross-sectional view showing a portion of the structure of a cover-cell assembly according to an exemplary embodiment based on the technical concept of this disclosure.

[0126] Specifically, Figure 8 Is with Figure 1 The enlarged cross-sectional view corresponding to region A in the diagram shows the enlarged cross-sectional view of the cell cover 121FE.

[0127] Reference Figure 1 and Figure 8 The cover-cell assembly 122 may include a cell cover 121FE covering the battery cell 121.

[0128] In some embodiments, the cell cover 121FE may include a composite layer 121FE_1 and a phase change material 121FE_2 dispersed within the composite layer 121FE_1. For example, the composite layer 121FE_1 may include a high-viscosity grease or paste. The phase change material 121FE_2 may be in capsule form.

[0129] Specifically, a composite layer 121FE_1 comprising dispersed phase change material 121FE_2 can be externally applied to the battery pack 100 to form a cell cover 121FE. The phase change material 121FE_2 will not leak due to the composite layer 121FE_1. Specifically, even if the phase of the phase change material 121FE_2 changes by absorbing or releasing heat, the phase change material 121FE_2 will not leak.

[0130] (Eighth Implementation)

[0131] Figure 9 This is a diagram illustrating a battery cell assembly 120 including a cover-cell assembly 122 according to an exemplary embodiment based on the technical concept of this disclosure.

[0132] Reference Figure 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, etc. (122_1 to 122_12). Each of the plurality of cover-cell assemblies 122_1 to 122_12 is referenced to... Figure 1 and Figure 2 The described cover-cell assembly 122 is essentially the same.

[0133] Multiple cover-cell assemblies 122_1 to 122_12 can be arranged along a first direction (X direction). For example, multiple cover-cell assemblies 122_1 to 122_12 can be joined together by adhesive.

[0134] Multiple cover-cell assemblies 122_1 to 122_12 can form multiple groups. For example, cover-cell assemblies 122_1, 122_2, and 122_3 can be connected in parallel to form a first group. Cover-cell assemblies 122_4, 122_5, and 122_6 can be connected in parallel to form a second group. Cover-cell assemblies 122_7, 122_8, and 122_9 can be connected in parallel to form a third group. Cover-cell assemblies 122_10, 122_11, and 122_12 can be connected in parallel to form a fourth group. These multiple groups can also be connected in series.

[0135] The resulting connection configuration of multiple cover-cell assemblies 122_1 to 122_12 can be referred to as 3-parallel-4-series (3P-4S), but this is merely exemplary and does not limit the technical concept of this disclosure in any way. The number of groups connected in series and the number of cover-cell assemblies 122_1 to 122_12 included in the multiple groups can be determined based on the desired voltage and current output from the battery cell assembly 120.

[0136] The battery cell assembly 120 may also include a pad, a first integrated circuit assembly, a second integrated circuit assembly, and a flexible flat cable (FFC) assembly.

[0137] The pad can absorb the expansion of multiple cover-cell assemblies 122_1 to 122_12. Each pad may include polyurethane (PU). Each pad may include a refractory material, such as silicone resin.

[0138] The first integrated circuit assembly may include an insulating frame, an integrated circuit, a busbar, a sensing board, a sensing rod, a temperature sensor, wiring, and an insulating cover. The second integrated circuit assembly may include an insulating frame, an integrated circuit, a sensing board, a temperature sensor, wiring, and an insulating cover.

[0139] The first integrated circuit assembly and the second integrated circuit assembly provide electrical connections between a plurality of cover-cell assemblies 122_1 to 122_12, output the resulting voltages of the plurality of cover-cell assemblies 122_1 to 122_12, and may include physical and functional configurations for measuring the voltage (or current) of nodes within a circuit composed of the plurality of cover-cell assemblies 122_1 to 122_12.

[0140] The insulating frame may include insulating materials such as plastic. The insulating frame may cover the front of multiple cover-cell assemblies 122_1 to 122_12. The insulating frame may support integrated circuits, busbars, sensing boards, sensing rods, temperature sensors, and wiring.

[0141] The busbar can be shorted to the positive lead 121P of the first group of cover-cell assemblies 122_1 and 122_2, and the negative lead 121N of one or more cover-cell assemblies 122_11 and 122_12 in the last group. The busbar can be soldered to the positive lead 121P of the first group of cover-cell assemblies 122_1, 122_2, and 122_3, and the negative lead 121N of one or more cover-cell assemblies 122_10, 122_11, and 122_12 in the last group. The voltage obtained from the multiple cover-cell assemblies 122_1 to 122_12 of the battery cell assembly 120 can be output through the busbar. The busbar can be fixed to the insulating frame.

[0142] The integrated circuit can be mounted on an insulating frame. Soldered positive lead 121P and negative lead 121N can form a node within the battery cell assembly 120. The integrated circuit can be configured to measure the voltage of the node via a sensing plate and a sensing rod.

[0143] The sensing rod may include a conductive material. The sensing rod may have a rod shape. The sensing rod may be shorted to a busbar. The sensing rod may be connected to a busbar. The voltage of the busbar can be measured using the sensing rod.

[0144] Each of the multiple sensing plates may have a patch shape or a pad shape. The multiple sensing plates may include a conductive material. The multiple sensing plates may be shorted to corresponding leads in the positive lead 121P and negative lead 121N of the multiple cover-cell assemblies 122_1 to 122_12.

[0145] Each of the multiple sensing plates can be connected to an integrated circuit. The voltage at multiple nodes within the battery cell assembly 120 can be measured using these multiple sensing plates.

[0146] Temperature sensors can be configured to measure the temperature at multiple points within the battery cell assembly 120. The temperature sensors can be spatially arranged, thereby enabling the measurement of the temperature distribution within the battery cell assembly 120.

[0147] The insulating cover may include insulating material, such as plastic. The insulating cover may snap-fit ​​into an insulating frame. The insulating cover may cover integrated circuits, busbars, sensing boards, sensing rods, and temperature sensors, thereby protecting the electrical components of the first and second integrated circuit assemblies.

[0148] Reference Figure 9 The described battery cell assembly 120 may include a plurality of cover-cell assemblies 122, each cover-cell assembly 122 covering a battery cell 121 and including a cell cover 121F containing a phase change material. This enables temperature management of the battery cell assembly 120 through the absorption or release of heat via phase change.

[0149] According to embodiments based on the technical concept of this disclosure, a battery cell assembly 120 with enhanced safety can be provided.

[0150] According to embodiments based on the technical concept of this disclosure, a battery cell assembly 120 with improved performance and reliability can be provided.

[0151] (9th implementation)

[0152] Figure 10 This is a diagram illustrating an exemplary embodiment of a battery pack 100 based on the technical concept of this disclosure, the battery pack 100 including a cover-cell assembly 122.

[0153] Figure 11 This is a diagram illustrating a battery pack 100 including a cover-cell assembly 122 according to an exemplary embodiment based on the technical concept of this disclosure. Specifically, Figure 11 It is along Figure 10 The cross-sectional view of line XX.

[0154] refer to Figure 10 and Figure 11 The battery pack 100 may include a battery pack housing 110 and a plurality of battery cell assemblies 120. The battery pack 100 may be a final product installed in applications such as vehicles.

[0155] The battery pack housing 110 provides space for the battery cell assembly 120 to be installed. The battery pack housing 110 may include a base plate 111, side walls 112, 113, 114, 115, a central beam 116, and a crossbeam 117.

[0156] Here, the first direction (X direction) and the second direction (Y direction) can be substantially parallel to the mounting surface of the substrate 111 (i.e., the surface facing the battery cell assembly 120), and the third direction (Z direction) can be substantially perpendicular to the mounting surface of the substrate 111.

[0157] The substrate 111 and each sidewall 112, 113 can be provided by an extrusion process. The extrusion direction of each of the substrate 111 and sidewalls 112, 113 can be a first direction (X direction). Sidewalls 114, 115 can also be provided by an extrusion process. Sidewalls 112, 113, 114, 115 can be substantially perpendicular to the substrate 111.

[0158] According to an exemplary embodiment, the substrate 111 and sidewalls 112, 113 can be joined by friction stir welding. The substrate 111 may include multiple unit plates joined by friction stir welding.

[0159] The center beam 116 may extend in a first direction (X direction). The center beam 116 may be inserted between the sidewalls 112 and 113. The center beam 116 may be included in a center plate, which is one of a plurality of unit plates friction-stir welded together. Therefore, 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.

[0160] The crossbeam 117 can extend in a second direction (Y direction). The crossbeam 117 can be inserted between the side walls 114 and 115.

[0161] The substrate 111 may include a plurality of cooling channels. The plurality of cooling channels may provide pathways for the movement of a coolant (e.g., 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).

[0162] Multiple battery cell assemblies 120 can be disposed on a base plate 111 of the battery pack housing 110. The base plate 111 can support the multiple battery cell assemblies 120. Side walls 112, 113, 114, and 115 can horizontally surround the multiple battery cell assemblies 120. The side walls 112, 113, 114, and 115 can protect the multiple battery cell assemblies 120. The multiple battery cell assemblies 120 can be disposed on the base plate 111 within the space defined by the crossbeam 117.

[0163] The battery cell assembly 120 may further include a plurality of battery cells 121 disposed along a first direction (X direction) and a pad (not shown) disposed between the plurality of battery cells 121. The pad is disposed between the plurality of battery cells 121 along the first direction (X direction) and may overlap with the plurality of battery cells 121 along the first direction (X direction).

[0164] These pads can absorb the expansion of multiple battery cells 121. The pads may include an elastic material. The pads may include PU (polyurethane). The pads may also include a fire-resistant material.

[0165] The battery cell assembly 120 may also include a cell cover 121F covering each of the plurality of battery cells 121. As described above, the cell cover 121F may include a phase change material.

[0166] The battery pack 100 may also include battery pack leads 119 connected to the sidewalls 112, 113, 114, 115 of the battery pack housing 110. The battery pack leads 119 may cover components installed inside the battery pack 100, such as multiple battery cell assemblies 120 and electrical components. The battery pack leads 119 may be secured to the battery pack housing 110 by mechanical connections, such as bolts.

[0167] Figure 10 The arrangement of multiple battery cell assemblies 120 in the middle can be described as 3 2. Configuration. Figure 10 The arrangement of the multiple battery cell assemblies 120 disclosed herein is a non-limiting example and does not limit the technical concept of this disclosure in any way. Based on the description herein, those skilled in the art will readily obtain the following understanding: Multiple battery cell assemblies 120 arranged in an N configuration (where M and N are integers of 2 or greater).

[0168] The battery pack 100 may also include a battery management system (BMS). The BMS can 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 at specific nodes within the plurality of battery cell assemblies 120, and measuring the temperature at predetermined locations within the battery pack 100. The battery pack 100 may include instruments for measuring the aforementioned voltage, current, and temperature.

[0169] Balancing the battery pack 100 is an operation to reduce deviations between the multiple battery cell assemblies 120. Controlling the battery pack 100 includes preventing overcharging, over-discharging, and overcurrent. Through monitoring, balancing, and control, the battery pack 100 operates under optimal conditions, thereby preventing a shortened lifespan for each of the multiple battery cell assemblies 120.

[0170] The battery pack 100 may also include additional electrical components, such as a cooling device, a PRA (Power Relay Assembly), and a safety plug. The cooling device may include a cooling fan. The cooling fan can prevent each of the multiple battery cell assemblies 120 from overheating by circulating air within the battery pack 100. The PRA can be configured to supply or interrupt power from the high-voltage battery to an external load (e.g., a vehicle electric motor). In the event of an abnormal voltage (e.g., a voltage surge), the PRA can protect the multiple battery cell assemblies 120 and the external load (e.g., the vehicle electric motor) by disconnecting the power supply to the external load (e.g., the vehicle electric motor). Additional electrical components may be inserted between the multiple battery cell assemblies 120 and the sidewall 115. The space between the battery cell assemblies 120 and the sidewall 115 may also be referred to as an electrical component mounting area.

[0171] The battery pack 100 may also include a plurality of inter-busbars configured to electrically connect a plurality of battery cell assemblies 120. The plurality of battery cell assemblies 120 may be connected in series via the plurality of inter-busbars. Therefore, the battery pack 100 may be configured to output a high voltage to an external load (e.g., a vehicle electric motor).

[0172] Reference Figure 10 and Figure 11 The described battery pack 100 may include a plurality of battery cell assemblies 120, each battery cell assembly 120 including a plurality of cover-cell assemblies 122, each cover-cell assembly 122 covering a battery cell 121 and including a cell cover 121F containing a phase change material. This enables temperature management of the battery pack 100 by absorbing or releasing heat via phase change.

[0173] According to embodiments based on the technical concept of this disclosure, a battery pack 100 with enhanced safety can be provided.

[0174] According to embodiments based on the technical concept of this disclosure, a battery pack 100 with improved performance and reliability can be provided.

[0175] The present disclosure has been described in more detail above with reference to the accompanying drawings and embodiments. However, the configurations described in the drawings or the embodiments described herein are merely one embodiment of the present disclosure and do not represent all the technical concepts of the present disclosure. Therefore, it should be understood that various equivalents and modifications may exist at the time of filing this application.

Claims

1. A cover-cell assembly, the cover-cell assembly comprising: An electrode assembly comprising a positive electrode and a negative electrode stacked in a first direction; A housing that accommodates the electrode assembly; A cell cover, the cell cover being connected to the housing; as well as An air bag, located between one surface of the cell cover and the housing. The cell cover includes a phase change material (PCM).

2. The cover-cell assembly according to claim 1, wherein, The electrode assembly and the housing constitute a battery cell, wherein... The cell cover includes a first portion and a second portion. The first portion overlaps with the main surface of the battery cell in a first direction, and the second portion is connected to the first portion and overlaps with the battery cell in a second direction intersecting the first direction. The air bag is disposed between the battery cell and the second part of the cell cover, and The main surface of the battery cell is in close contact with the first portion of the cell cover.

3. The cover-cell assembly according to claim 2, wherein, The first portion of the cell cover completely covers the main surface of the battery cell.

4. The cover-cell assembly according to claim 2, wherein, The first portion of the cell cover does not cover at least a portion of the main surface of the battery cell.

5. The cover-cell assembly according to claim 1, wherein, The housing and the cell cover are spaced apart in a second direction that intersects the first direction.

6. The cover-cell assembly according to claim 1, wherein, The cell cover includes a housing and the phase change material encapsulated by the housing.

7. The cover-cell assembly according to claim 6, wherein, The pad housing comprises one selected from silicone, polyurethane, polypropylene, metal, and stainless steel.

8. The cover-cell assembly according to claim 1, wherein, The battery cell cover includes a sheet and a coating applied to the sheet, wherein, The coating comprises a capsule containing the phase change material and an adhesive mixed with the capsule.

9. The cover-cell assembly according to claim 1, wherein, The cell cover includes a polymer film that seals the phase change material.

10. The cover-cell assembly according to claim 1, wherein, The cell cover includes a thermally conductive composite layer and a capsule containing the phase change material dispersed within the thermally conductive composite layer.

11. A battery pack, the battery pack comprising: Battery pack casing; Multiple battery cells are arranged along a first direction within the battery pack housing; Multiple cell covers, wherein the multiple cell covers are connected to corresponding battery cells among the multiple battery cells. in, 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. The second portion of each of the plurality of cell covers is spaced apart from the upper portion of the plurality of battery cells in a second direction intersecting the first direction, and The cell cover includes a phase change material (PCM).

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