Battery assembly and device including same

Abstract

A battery assembly according to an embodiment of the present invention comprises: a plurality of battery cells; a housing having an accommodation space in which the battery cells are accommodated; and a cooling material positioned in the accommodation space and in contact with the battery cells. At least one shape part having at least one of a concave part or a convex part is provided in the housing.

Description

Battery assembly and device including the same

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2025-0006765 filed January 16, 2025 and Korean Patent Application No. 10-2026-0007945 filed January 15, 2026, and all contents disclosed in the documents of said Korean patent applications are incorporated herein as part of this specification.

[0003] The present invention relates to a battery assembly and a device including the same, and more specifically, to a battery assembly capable of responding to changes in internal pressure and a device including the same.

[0004] Secondary batteries, which have high applicability across product groups and electrical characteristics such as high energy density, are widely applied not only to portable devices but also to electric vehicles (EVs) or hybrid electric vehicles (HEVs) driven by electric power sources. These secondary batteries are widely used as an energy source for enhancing eco-friendliness and energy efficiency, not only because of the primary advantage of being able to drastically reduce the use of fossil fuels, but also because they do not generate any by-products from energy use.

[0005] Types of secondary batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells, or unit battery cells, is approximately 2.5V to 4.5V. Therefore, if a higher output voltage is required, a battery assembly may be formed by connecting multiple battery cells in series. Additionally, a battery pack may be formed by connecting multiple battery cells in parallel, depending on the charge / discharge capacity required for the battery assembly. Accordingly, the number of battery cells included in the battery assembly can be varied depending on the required output voltage or charge / discharge capacity.

[0006] Since these battery cells consist of rechargeable secondary batteries, such high-output, high-capacity secondary batteries generate a significant amount of heat during the charging and discharging process. In this case, the heat emitted from multiple battery cells is aggregated within a confined space, causing the temperature to rise rapidly and severely. In other words, while battery assemblies containing multiple battery cells can achieve high output, it is not easy to dissipate the heat generated by the cells during charging and discharging. If heat dissipation from the battery cells is not properly carried out, the degradation of the cells accelerates, shortening their lifespan and increasing the risk of explosion or ignition.

[0007] Furthermore, automotive battery assemblies are frequently exposed to direct sunlight and may be subjected to high-temperature conditions, such as during the summer or in desert regions. Additionally, because multiple battery cells are densely packed to extend a vehicle's driving range, flames or heat generated in a single battery cell can easily spread to neighboring cells, ultimately leading to the ignition or explosion of the battery pack itself.

[0008] In conventional battery assemblies, bottom cooling or side cooling methods have been used, in which a heat sink is mounted on the case of the battery assembly to cool it.

[0009] However, in this cooling method, heat generated from the battery cells is transferred to a heat sink on one side of the case for cooling, making it difficult to establish a heat transfer path to the other side of the case. Consequently, there are limitations, such as intensified temperature differences between one end and the other of the battery cell assembly, or unsatisfactory overall cooling efficiency. If these temperature differences are not resolved, issues regarding the safety and durability of the battery assembly arise. Poor cooling efficiency can accelerate the degradation of battery cells or lead to the propagation of thermal runaway if a rapid response is not possible when it occurs in some cells. This can result in disasters such as ignition and explosion of the battery assembly, causing not only property damage but also safety issues.

[0010] To solve this problem, it has been proposed to use a method of directly cooling the battery cells by filling the inside of the battery assembly with coolant or cooling oil, rather than relying on bottom cooling or side cooling. In other words, to effectively cool high-capacity battery assemblies, a method is used in which a cooling material directly cools the battery cells inside the battery assembly.

[0011] However, the volume of the cooling material can change depending on temperature or phase changes, and this volume change of the refrigerant can cause the pressure inside the battery assembly to change. If these pressure changes inside the battery assembly are not controlled and managed, the battery assembly may be damaged, and the sealing structure may be released, causing the cooling material located inside to leak to the outside. Therefore, it is necessary to develop technology that can prevent internal pressure changes resulting from the volume change of the cooling material from leading to the failure of the battery assembly.

[0012] The problem that the present invention aims to solve is to provide a battery assembly capable of responding to a change in pressure inside a housing resulting from a change in the volume of a cooling material, and a device including the same.

[0013] However, the problems that the embodiments of the present invention aim to solve are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0014] A battery assembly according to one embodiment of the present invention comprises: a plurality of battery cells; a housing having a storage space in which the battery cells are stored; and a cooling material located in the storage space and in contact with the battery cells. At least one shaped portion having at least one of a concave portion or a convex portion is provided in the housing.

[0015] The above-mentioned shaped portion may include the concave portion or the convex portion.

[0016] The above-mentioned shaped portion may include the concave portion and the convex portion.

[0017] The above-mentioned shape may be in a continuously connected form.

[0018] The above-mentioned shape may have the shape of a closed loop and be in a continuously connected form.

[0019] The above-mentioned shaped parts are provided in multiple numbers, and the shaped parts may be separated from each other.

[0020] The above storage space can be sealed by the above housing.

[0021] The above-mentioned shape portion may be provided on the upper surface of the housing.

[0022] The battery cell may include a terminal portion. A busbar electrically connected to the terminal portion of the battery cells may be provided. The housing may include a busbar mounting portion in which the busbar is disposed, and the busbar mounting portion may be located between the housing portion equipped with the shaped portion and the battery cells.

[0023] A hole may be formed in the above housing, and the shaped part may be mounted in the hole.

[0024] The above-mentioned shape portion may be formed by deforming the shape of a part of the housing.

[0025] A device according to one embodiment of the present invention includes the battery assembly.

[0026] According to embodiments of the present invention, at least one shaped portion provided in a housing and having at least one of a concave portion or a convex portion can absorb a change in pressure inside the housing when the volume of the cooling material changes. Accordingly, even if the volume of the cooling material changes, damage to the housing and subsequent leakage of the refrigerant can be prevented.

[0027] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims.

[0028] The following drawings attached to this specification illustrate embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0029] FIG. 1 is a perspective view showing a battery assembly according to one embodiment of the present invention.

[0030] Figure 2 is an exploded perspective view of the battery assembly of Figure 1.

[0031] Figure 3 is a cross-sectional view showing a cross-section cut along the cutting line A-A' of Figure 1.

[0032] FIG. 4 is a perspective view showing one of the battery cells included in the battery assembly of FIG. 2.

[0033] FIG. 5 is a perspective view showing a part of a housing according to one embodiment of the present invention.

[0034] Fig. 6 is an exploded perspective view of a part of the housing of Fig. 5.

[0035] FIG. 7 is a perspective view showing a member having a shaped portion according to one embodiment of the present invention.

[0036] FIG. 8 is a cross-sectional perspective view showing the cut along the cutting line B-B' of FIG. 7.

[0037] FIG. 9 is a cross-sectional perspective view showing the cut along the cutting line C-C' of FIG. 7.

[0038] FIG. 10 is a perspective view showing a part of a housing according to one embodiment of the present invention.

[0039] FIG. 11 is a cross-sectional perspective view showing the cut along the cutting line D-D' of FIG. 10.

[0040] FIG. 12 is a perspective view showing a part of the housing of FIG. 10 from a different angle.

[0041] FIG. 13 is a perspective view showing a part of a busbar assembly and a housing according to one embodiment of the present invention.

[0042] FIG. 14 is a cross-sectional view of a battery assembly according to another embodiment of the present invention.

[0043] FIG. 15 is a perspective view showing a battery assembly according to one embodiment of the present invention.

[0044] FIG. 16 is an exploded perspective view of the battery assembly of FIG. 15.

[0045] FIG. 17 is a cross-sectional view showing a cross-section cut along the cutting line E-E' of FIG. 15.

[0046] FIG. 18 is a perspective view showing a part of a housing according to one embodiment of the present invention.

[0047] FIG. 19 is an exploded perspective view of a part of the housing of FIG. 18.

[0048] FIGS. 20 and FIGS. 21 are a cross-sectional perspective view and a cross-sectional view showing the cut along the cutting line F-F' of FIG. 18.

[0049] FIG. 22 is a perspective view showing a part of a housing according to one embodiment of the present invention.

[0050] FIG. 23 is a cross-sectional perspective view showing the cut along the cutting line G-G' of FIG. 22.

[0051] FIG. 24 is a perspective view showing a part of the housing of FIG. 22 from a different angle.

[0052] FIG. 25 is a partial drawing showing an enlarged view of the “H” portion of FIG. 17.

[0053] FIG. 26 is a perspective view showing a battery assembly according to one embodiment of the present invention.

[0054] FIG. 27 is an exploded perspective view of the battery assembly of FIG. 26.

[0055] FIG. 28 is a top view of a part of a housing according to one embodiment of the present invention.

[0056] FIG. 29 is a cross-sectional view showing the cut along the cutting line I-I' of FIG. 28.

[0057] FIG. 30 is a diagram showing a disassembled portion of a housing according to one embodiment of the present invention.

[0058] FIG. 31 is a perspective view showing a battery assembly according to one embodiment of the present invention.

[0059] FIG. 32 is an exploded perspective view of the battery assembly of FIG. 31.

[0060] FIG. 33 is a perspective view showing a battery assembly according to one embodiment of the present invention.

[0061] FIG. 34 is an exploded perspective view of the battery assembly of FIG. 33.

[0062] FIG. 35 is a cross-sectional view showing a cross-section cut along the cutting line J-J' of FIG. 33.

[0063] FIG. 36 is a perspective view showing a part of a housing according to one embodiment of the present invention.

[0064] FIG. 37 is a cross-sectional view showing a cross-section cut along the cutting line K-K' of FIG. 36.

[0065] FIG. 38 is a perspective view showing a part of a housing according to one embodiment of the present invention.

[0066] FIG. 39 is a cross-sectional perspective view showing the cut along the cutting line L-L' of FIG. 38.

[0067] FIG. 40 is a perspective view showing a part of the housing of FIG. 38 from a different angle.

[0068] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0069] To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0070] Furthermore, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and thus the present invention is not necessarily limited to what is illustrated. Thicknesses have been enlarged in the drawings to clearly represent various layers and regions. Additionally, for convenience of explanation, the thickness of some layers and regions has been exaggerated in the drawings.

[0071] Furthermore, when a part such as a layer, membrane, region, or plate is said to be "on" or "on" another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when a part is said to be "directly above" another part, it means that there is no other part in between. Also, saying that a part is "on" or "on" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "on" or "on" facing the opposite direction of gravity.

[0072] Furthermore, throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0073] Additionally, throughout the specification, "planar" means when the subject part is viewed from above, and "cross-sectional" means when the cross-section obtained by vertically cutting the subject part is viewed from the side.

[0074] FIG. 1 is a perspective view showing a battery assembly according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the battery assembly of FIG. 1. FIG. 3 is a cross-sectional view showing a cross section cut along the cutting line A-A' of FIG. 1.

[0075] Referring to FIGS. 1 to 3, a battery assembly (100) according to one embodiment of the present invention comprises: a plurality of battery cells (110); a housing (200) having a storage space (200S) in which the battery cells (110) are stored; and a cooling material located in the storage space (200S) and in contact with the battery cells (110). At least one shaped portion (300, Shaped Portion) having at least one of a concave portion or a convex portion is provided in the housing (200).

[0076] In some embodiments of the present invention, the shape portion (300) may include a concave portion or a convex portion. In other embodiments of the present invention, the shape portion (300) may include both a concave portion and a convex portion. FIGS. 1 to 3 illustrate, as an embodiment, the structure of a shape portion (300) having a concave portion (310). The structure of a shape portion having a convex portion and the structure of a shape portion having both a concave portion and a convex portion will be described later.

[0077] Battery cells (110) can be stored in a storage space (200S) of a housing (200), and a cooling material can be filled in this storage space (200S). Although not specifically illustrated, the cooling material may be located together with the battery cells (110) in the storage space (200S) inside the housing (200) and may come into direct contact with the outer surface of the battery cells (110). Heat generated from the battery cells (110) can be transferred to the outside through this cooling material.

[0078] The cooling material in the present invention serves as a cooling medium for cooling a heat-generating object, and there are no restrictions on its form or material. Cooling materials of various phases may be applied. For example, a cooling medium in a fluid or liquid state may be applied to the cooling material without limitation. Additionally, bubbles, paraffin, or phase change materials (PCMs) may be applied to the cooling material.

[0079] As an example, the cooling material may be a fluid. Additionally, the cooling material may be a liquid. The cooling material may be cooling water or cooling oil. Meanwhile, within the battery assembly (100), the cooling material may come into direct contact with the battery cells (110) and terminals (111, 112), and the cooling material may be electrically insulating. The cooling material may be a material having insulating properties. For example, the cooling material may be insulating oil. However, these are exemplary materials, and as described above, any material capable of cooling an object requiring cooling may be applied to the cooling material in the present invention without limitation.

[0080] When the temperature of the cooling material changes or a phase change occurs, the volume of the cooling material may change. For example, in the case of a cooling material to which a phase change material (PCM) is applied, a volume increase of about 10% may occur when the temperature of the cooling material rises to 40 to 80 degrees Celsius. Depending on this volume change of the cooling material, the pressure of the storage space (200S) inside the housing (200) may change. If the pressure change of the storage space (200S) is not controlled or responded to, the housing (200) may be damaged, and the seal of the storage space (200S) of the housing (200) may be released, causing the cooling material located in the storage space (200S) to leak to the outside. For example, as the temperature of the cooling material changes or the phase of the cooling material changes, the volume of the cooling material may increase, and accordingly, the pressure of the storage space (200S) inside the housing (200) may increase. The housing (200) may be damaged by the increased pressure of the storage space (200S), and as the seal of the storage space (200S) of the housing (200) is released, the cooling material located in the storage space (200S) may leak out to the outside.

[0081] In order to prevent such problems, at least one shaped portion (300) having at least one of a concave portion (310) or a convex portion is provided in the housing (200). When the volume of the cooling material changes and the pressure of the storage space (200S) inside the housing (200) changes accordingly, the shape of the shaped portion (300) can change. Through the action of the concave portion (310) or the convex portion expanding and contracting, the shaped portion (300) can absorb the pressure change of the storage space (200S) and reduce the load applied to the housing (200). Ultimately, even if the volume of the cooling material changes, damage to the housing (200) and the resulting leakage of the cooling material can be prevented. At least one of the concave portion (310) or the convex portion can act as a kind of wrinkle in the housing (200), and flexibility can be added to the housing (200) so that the housing (200) can change shape in response to pressure changes in the storage space (200S).

[0082] Hereinafter, the battery cell (110) according to the present embodiment will be further described. The battery cell (110) according to the present embodiment may be any type of secondary battery, such as a prismatic, cylindrical, or pouch-type battery cell. However, below, as an example, the battery cell (110) which is a cylindrical cell will be described.

[0083] FIG. 4 is a perspective view showing one of the battery cells included in the battery assembly of FIG. 2.

[0084] Referring to FIGS. 2 to 4 together, the battery cell (110) according to the embodiments may be provided with terminal portions (111, 112). The battery cell (110) may be provided with a first terminal portion (111) and a second terminal portion (112) as positive and negative electrode terminals.

[0085] For example, the battery cell (110) according to the present embodiment may be a cylindrical battery cell. Specifically, the battery cell (110) may include an electrode assembly; a battery can that houses the electrode assembly and has an open top; and a cap assembly that is coupled to the open top of the battery can. A gasket may be interposed between the battery can and the cap assembly. The battery can may be a cylindrical case with an open top, may house the electrode assembly and electrolyte in an internal storage space, and may include a metal material such as aluminum (Al).

[0086] The cap assembly may include a top cap comprising a metal material having electrical conductivity. The cap assembly may be joined to the battery can through crimping or the like while covering the open top of the battery can.

[0087] A cap assembly including a top cap can function as a first terminal part (111) which is an external terminal of a first electrode included in an electrode assembly, and a battery can can function as a second terminal part (112) which is an external terminal of a second electrode included in an electrode assembly.

[0088] Meanwhile, although not specifically illustrated, the battery cell (110) according to the present embodiment may include a vent section. When a thermal event or thermal runaway phenomenon occurs inside any one of the battery cells (110), high-temperature venting gas or particles may be generated. The vent section is a general term for a component or mechanism provided in the battery cell (110) to discharge such high-temperature venting gas or particles.

[0089] Battery cells (110) can be arranged in close contact within a storage space (200S) inside a housing (200), and the battery cells (110) can be electrically connected to each other via a busbar, etc., described later.

[0090] Referring again to FIGS. 1 to 3, in the battery assembly (100) according to the present embodiment, the storage space (200S) can be sealed by the housing (200). In other words, the battery cells (110) and the cooling material can be sealed by the housing (200) while located in the storage space (200S).

[0091] When the storage space (200S) is sealed by the housing (200), it may be more important to control the pressure change of the storage space (200S). When the storage space (200S) is sealed by the housing (200), the pressure change of the storage space (200S) due to the volume change of the cooling material can place a heavy load on the housing (200), and consequently, the possibility of the housing (200) being damaged or the sealing of the storage space (200S) of the housing (200) being released increases. In this embodiment, at least one shaped part (300) is provided in the housing (200) that forms the sealing structure of the storage space (200S), thereby preventing the above problems that may be caused by the volume change of the cooling material.

[0092] FIG. 5 is a perspective view showing a part of a housing according to an embodiment of the present invention. FIG. 6 is an exploded perspective view of a part of the housing of FIG. 5. In particular, FIG. 5 and FIG. 6 show the configuration of a top frame (210) of a housing (200). FIG. 7 is a perspective view showing a member having a shaped part according to an embodiment of the present invention. FIG. 8 is a cross-sectional perspective view showing a view cut along the cutting line B-B' of FIG. 7. FIG. 9 is a cross-sectional perspective view showing a view cut along the cutting line C-C' of FIG. 7.

[0093] Referring to FIGS. 2, FIGS. 3, FIGS. 5 to 9, the structure of a shaped part (300) having a concave part (310) is illustrated as an embodiment of the present invention. The shaped part (300) according to the present embodiment may be in a continuously connected form. FIGS. 5 to 9 is shown as an example in which the concave part (310) is in a continuously connected form. Additionally, the shaped part (300) may be in a continuously connected form having a closed-loop shape. FIGS. 5 to 9 is shown as an example in which the concave part (310) is in a continuously connected form having a closed-loop shape. In the present invention, having a closed-loop shape may mean that the shaped part (300) has a closed structure in which the starting point and the ending point meet while being continuously connected without interruption. However, there are no special limitations on the specific shape of the closed structure. Referring to FIGS. 5 to 9, it is shown that the shape portion (300) has a closed-loop structure in the shape of a square with rounded corners having four sides.

[0094] As the shape portion (300) is continuously connected and forms a closed loop structure, it can have significant advantages in terms of isotropic stress distribution and sealing stability, going beyond simply relieving stress in a specific direction on one side of the housing (200).

[0095] When a pressure change occurs in the storage space (200S), the stress applied to the housing (200) may occur in all directions on the plane, rather than in a specific straight line direction. The shape portion (300) having a closed loop structure can uniformly absorb and disperse expansion pressure coming from all directions, not limited to a specific direction. By preventing the stress concentration phenomenon in which the stress of the housing (200) due to the pressure change in the storage space (200S) is directed toward a specific direction, the distortion of the housing (200) and the applied load can be minimized.

[0096] In addition, conventional wrinkle patterns have disconnected starting and ending points, and since these starting or ending points are structurally weak, stress is prone to concentration. On the other hand, as in the present embodiment, a shape part (300) that implements a continuously connected closed loop structure can have the effect of structurally eliminating disconnected starting or ending points. Accordingly, it is possible to prevent cracks from occurring in the housing (200) itself due to stress concentration at specific points, and the structural durability of the entire housing (200) can be significantly improved even when there is a change in pressure in the storage space (200S) due to a change in the volume of the cooling material.

[0097] The closed loop may have a shape that matches the outer shape of the member equipped with the shape portion (300). The member equipped with the shape portion (300) shown in FIGS. 7 to 9 may have a rectangular shape, and the closed loop may have a rectangular shape to match this. By having the closed loop have a shape that matches the outer shape of the member equipped with the shape portion (300), the shape portion (300) can be implemented throughout the member equipped with the shape portion (300), and the area of ​​the shape portion (300) capable of absorbing pressure changes can be increased. Accordingly, the shape portion (300) can absorb and control pressure changes more effectively and flexibly in the storage space (200S).

[0098] FIG. 10 is a perspective view showing a part of a housing according to an embodiment of the present invention. In particular, FIG. 10 shows the configuration of a middle frame (230) of the housing (200). FIG. 11 is a cross-sectional perspective view showing a view cut along the cutting line D-D' of FIG. 10. FIG. 12 is a perspective view showing a part of the housing of FIG. 10 from a different angle.

[0099] Referring to FIGS. 1 to 3, FIGS. 5, FIGS. 6 and FIGS. 10 to 12, the housing (200) may include a top frame (210) and a bottom frame (220) that form a storage space (200S). The top frame (210) may be located above the battery cells (110), and the bottom frame (220) may be located below the battery cells (110).

[0100] A housing (200) according to one embodiment may include a middle frame (230) located between a top frame (210) and a bottom frame (220). A storage space (200S) according to this embodiment may be created by combining the top frame (210), the bottom frame (220), and the middle frame (230). The storage space (200S) may be covered by the top frame (210), the bottom frame (220), and the middle frame (230). Additionally, the storage space (200S) may be sealed by the top frame (210), the bottom frame (220), and the middle frame (230). Battery cells (110) according to this embodiment may be placed in a sealed state within the storage space (200S) surrounded by the top frame (210), the bottom frame (220), and the middle frame (230), and a cooling material may be filled into this storage space (200S). There are no special restrictions on the combination form of the top frame (210), bottom frame (220), and middle frame (230), and various methods such as physical restraint methods like bolt fastening or interlocking, adhesives, and welding may be applied, taking into account the material or thickness applied to the housing (200).

[0101] The housing (200) may include side wall portions (200W) that cover the side of the storage space (200S). Additionally, the housing (200) may include a busbar mounting portion (200B). The battery assembly (100) may include a busbar (131) electrically connected to terminal portions (111, 112) of the battery cell (110), and the busbar (131) may be placed in the busbar mounting portion (200B). In one embodiment, the side wall portions (200W) and the busbar mounting portion (200B) may be included in the middle frame (230) of the housing (200). The middle frame (230) according to the present embodiment may be a structure in which the side wall portions (200W) and the busbar mounting portion (200B) are integrated. As illustrated in FIG. 12, the space enclosed by the side walls (200W) of the middle frame (230) and the busbar mounting portion (200B) may correspond to at least a part of the storage space (200S), and the battery cells (110) may be located in this storage space (200S). However, this is just one example, and as another example, the side walls (200W) may be provided on the top frame (210) or the bottom frame (220), and as yet another example, the busbar mounting portion (200B) may be provided on the top frame (210).

[0102] Referring again to FIGS. 2, FIGS. 3, FIGS. 5 to 9, there are no particular limitations on the method of providing the shaped portion (300) in the housing (200) in the present invention. For example, a hole (200H) may be formed in the housing (200), and the shaped portion (300) may be mounted in the hole (200H). The member having the shaped portion (300) shown in FIG. 7 may be a separate member having a material different from that of the housing (200), and the shaped portion (300) may be provided in the housing (200) by providing a hole (200H) and mounting the member having the shaped portion (300) in the hole (200H).

[0103] There are no specific restrictions on the method of mounting the member equipped with the shaped portion (300) into the hole (200H). For example, the member equipped with the shaped portion (300) can be mounted into the hole (200H) of the housing (200) using a fixing bracket (400). After positioning the member equipped with the shaped portion (300) between the fixing bracket (400) and one side of the housing (200), the member equipped with the shaped portion (300) can be fixed to the housing (200) by joining the fixing bracket (400) and the housing (200) using a bolt or the like. As illustrated in FIG. 6, a hole (200H) may be formed in the top frame (210) of the housing (200), and a member having a shaped portion (300) may be positioned between the fixing bracket (400) and the top frame (210), and the fixing bracket (400) may be connected to the top frame (210) by means of a bolt or the like. However, this is an exemplary structure, and as another example, the member having the shaped portion (300) may be mounted to the housing (200) using an adhesive or the like.

[0104] Meanwhile, the housing (200) may include a grid portion (200G) provided in the hole (200H). The grid portion (200G) can prevent battery cells (110) or other electrical components provided in the storage space (200S) from falling out through the hole (200H).

[0105] FIG. 13 is a perspective view showing a part of a busbar assembly and a housing according to one embodiment of the present invention. In particular, FIG. 13 shows a middle frame (230) of a busbar assembly (130) and a housing (200).

[0106] Referring to FIGS. 2, FIGS. 3, FIGS. 10 to 13, a battery assembly (100) according to one embodiment of the present invention may include a busbar assembly (130) electrically connected to terminal portions (111, 112) of a battery cell (110).

[0107] Battery cells (110) may be electrically connected to each other in series or parallel via a busbar assembly (130). The busbar assembly (130) may include a busbar (131) that is electrically connected to terminal portions (111, 112) of the battery cells (110). The busbar (131) may be located on a busbar mounting portion (200B) of the housing (200). The busbar (131) may include a metal material having electrical conductivity.

[0108] A busbar mounting hole (200BH) may be formed in the busbar mounting portion (200B). The terminal portions (111, 112) of the battery cell (110) may be electrically connected to the busbar assembly (130) through the busbar mounting hole (200BH). The terminal portions (111, 112) of the battery cell (110) may be electrically connected to the busbar (131) through the busbar mounting hole (200BH).

[0109] Grooves for mounting busbars (131) may be provided on the busbar mounting portion (200B), and the busbars (131) may be mounted in these grooves. The terminal portions (111, 112) of the battery cell (110) may be exposed to the upper part of the busbar mounting portion (200B) through the busbar mounting portion hole (200BH), and the terminal portions (111, 112) exposed through the busbar mounting portion hole (200BH) may be connected to the busbar (131).

[0110] The busbar assembly (130) may include a terminal (132) connected to the busbar (131). The terminal (132) may be a component for electrically connecting battery cells (110) inside the battery assembly (100) to other electrical components or other battery assemblies (100) located outside the battery assembly (100). The terminal (132) may guide the electrical connection of the battery assembly (100). The terminal (132) may be configured to guide the HV (High voltage) connection of the battery assembly (100) unit. The terminal (132) may include an electrically conductive material, and may include, for example, a metal material.

[0111] The busbar assembly (130) may include a sensing member (133). The sensing member (133) may be configured to sense voltage data or thermal data of the battery cells (110). For example, the sensing member (133) may be connected to the terminals (111, 112) of the battery cells (110) or to the busbar (131). Accordingly, voltage data of each battery cell (110) can be sensed and transmitted to the outside. A portion of the sensing member (133) may be exposed to the outside of the housing (200). The sensing member (133) is not limited in shape or type as long as it can transmit voltage data or thermal data, but may be, for example, a flexible printed circuit board (FPCB) or a flexible flat cable (FFC).

[0112] Referring to FIGS. 1 to 3, FIGS. 5 and FIGS. 6, a shaped portion (300) according to one embodiment of the present invention may be provided on the upper surface of a housing (200). For example, the shaped portion (300) may be provided on a top frame (210). Additionally, as described above, the housing (200) may include a busbar mounting portion (200B) in which a busbar (131) is placed. The busbar mounting portion (200B) may be located between the housing portion in which the shaped portion (300) is provided and the battery cells (110). In other words, the shaped portion (300) may be provided in the housing (200) portion corresponding to the upper part of the busbar mounting portion (200B) in which the busbar (131) is placed. Accordingly, the shaped portion (300) is provided on the upper surface of the housing (200), which is the part of the housing (200) corresponding to the upper portion of the busbar seating portion (200B), so that it can be positioned in a location where it is easy to control the pressure change of the storage space (200S) due to the volume change of the cooling material. If the shaped portion (300) is provided on another part of the housing (200), the shaped portion (300) is blocked by the cooling material, so the action of the concave or convex portion of the shaped portion (300) expanding and contracting may not affect the storage space (200S). Accordingly, the shaped portion (300) can be provided on the upper surface of the housing (200) so that it can absorb the pressure change of the storage space (200S).

[0113]

[0114] Referring to FIGS. 2, FIGS. 3, FIGS. 10 to 12, etc., a housing (200) according to one embodiment of the present invention may include recessed portions (200D) that are recessed in the opposite direction to the direction in which the storage space (200S) is located. Each of the battery cells (110) may be inserted into the recessed portion (200D). The recessed portion (200D) may be provided in the busbar mounting portion (200B) of the housing (200). Meanwhile, busbar mounting portion holes (200BH) may be provided in the busbar mounting portion (200B), and the busbar mounting portion holes (200BH) may be provided in the recessed portion (200D).

[0115] The indentation (200D) according to the present embodiment may refer to a concave receiving space formed by indenting a portion in the thickness direction from the inner surface of the busbar mounting portion (200B). In the present invention, the shape of the indentation (200D) is not particularly limited as long as it can provide a predetermined space into which battery cells (110) can be inserted. For example, the indentation (200D) having a concave receiving space formed by indenting a portion in the +z-axis direction in the busbar mounting portion (200B) may be provided. The indentation (200D) is designed to correspond to the shape of one end of the battery cells (110) to help with stable fixation and alignment of the battery cells (110). The inner diameter of the indentation (200D) may be designed to be slightly larger than the outer diameter of the battery cell (110).

[0116] The indentation (200D) may have a planar shape such as a circle, ellipse, or polygon corresponding to the shape of the battery cells (110). Additionally, multiple indentations (200D) may be formed corresponding to the battery cells (110). For example, the indentations (200D) may correspond one-to-one with each battery cell (110). The inner surface of the indentation (200D) may be formed as a vertical surface, an inclined surface, or a curved surface, and a tapered or rounded shape may be applied to the inlet portion to facilitate the insertion of the battery cells (110). The indentation (200D) may be formed integrally during injection molding or formed through machining.

[0117] As described above, the busbar mounting hole (200BH) may be provided in the recess (200D). For example, the busbar mounting hole (200BH) may be provided on one side of the recess (200D). The busbar mounting hole (200BH) may be provided on one surface of the busbar mounting portion (200B) within the space inside the recess (200D). In other words, a busbar mounting hole (200BH) in the form of a penetrating portion may be provided on one side of the recess (200D) according to the direction in which the battery cell (110) is inserted into the recess (200D).

[0118] A battery cell (110) can be inserted into the recess (200D). The battery cell (110) can be inserted into the inner surface of the recess (200D) in a fitted manner. Additionally, although not specifically illustrated, a sealing member may be provided on the inner surface of the recess (200D). The sealing member within the recess (200D) can be formed continuously along the perimeter of the recess (200D) while avoiding the busbar seating hole (200BH).

[0119] Due to the structure of the indentation (200D), the problem of the cooling material leaking upward through the busbar mounting hole (200BH) can be prevented. That is, the indentation (200D) according to the present embodiment can fix and align the battery cells (110) within the storage space (200S), and at the same time, can block the cooling material from leaking upward through the busbar mounting hole (200BH).

[0120] Meanwhile, referring to FIGS. 2 and 3, a battery assembly (100) according to one embodiment of the present invention may include a spacer (500) located in a storage space (200S). A spacer hole (500H) may be formed in the spacer (500), and battery cells (110) may be inserted into the spacer hole (500H). A plurality of spacer holes (500H) may be formed corresponding to the battery cells (110). For example, the spacer holes (500H) may correspond one-to-one with each battery cell (110). Since the battery cells (110) are fitted into the spacer hole (500H), the battery cells (110) are prevented from moving out of their position within the storage space (200S) and can be fixed and aligned within the storage space (200S).

[0121] Meanwhile, as long as the action of expanding or contracting the concave or convex portions can be exerted, there are no special restrictions on the material applied to the shaped portion (300) in the present invention. For example, the shaped portion (300) may include one or more materials selected from the group consisting of plastic, rubber, thermoplastic polyurethane (TPU), thermoplastic elastomer (TPE), polytetrafluoroethylene (PTFE), and urethane materials. The rubber may be butyl rubber, nitrile rubber, nitrile butadiene rubber, fluorocarbon rubber, ethylene-propylene-diene rubber, or silicone rubber. The fluorocarbon rubber is also referred to as FKM.

[0122] FIG. 14 is a cross-sectional view of a battery assembly according to another embodiment of the present invention.

[0123] Referring to FIG. 14, a housing (200) according to one embodiment of the present invention may further include a top cover (240) that covers the upper part of a top frame (210). The top cover (240) may be connected to a bottom frame (220). The bottom frame (220) according to the present embodiment may cover the lower part of the battery cells (110) and simultaneously extend upward to be connected to the top cover (240). There are no special restrictions on the method of connection between the top cover (240) and the bottom frame (220), and for example, a bolted connection may be applied. Additionally, a gasket may be interposed between the respective connection parts of the top cover (240) and the bottom frame (220). By covering the upper part of the top frame (210), the top cover (240) can prevent the top frame (210) and the shaped part (300) formed thereon from being damaged by the external environment or impact.

[0124]

[0125] FIG. 15 is a perspective view showing a battery assembly according to one embodiment of the present invention. FIG. 16 is an exploded perspective view of the battery assembly of FIG. 15. FIG. 17 is a cross-sectional view showing a cross section cut along the cutting line E-E' of FIG. 15.

[0126] Referring to FIGS. 15 to 17, a battery assembly (100) according to one embodiment of the present invention comprises: a plurality of battery cells (110); a housing (200) having a storage space (200S) in which the battery cells (110) are stored; and a cooling material located in the storage space (200S) and in contact with the battery cells (110). At least one shaped portion (300, Shaped Portion) having at least one of a concave portion or a convex portion is provided in the housing (200). The shaped portion (300) according to the present embodiment may include a concave portion (310) and a convex portion (320).

[0127] Battery cells (110) can be stored in a storage space (200S) of a housing (200), and a cooling material can be filled into this storage space (200S). Although not specifically illustrated, the cooling material may be located together with the battery cells (110) in the storage space (200S) inside the housing (200) and may come into direct contact with the outer surface of the battery cells (110).

[0128] In this embodiment, at least one shaped part (300) having a concave part (310) and a convex part (320) is provided in the housing (200). When the volume of the cooling material changes and the pressure of the storage space (200S) inside the housing (200) changes accordingly, the shape of the shaped part (300) can change. Through the action of at least one of the concave part (310) or the convex part (320) expanding and contracting, the shaped part (300) can absorb the pressure change of the storage space (200S) and reduce the load applied to the housing (200). Ultimately, even if the volume of the cooling material changes, damage to the housing (200) and subsequent leakage of the cooling material can be prevented. At least one of the concave portion (310) or the convex portion (320) can act as a kind of wrinkle in the housing (200), and flexibility can be added to the housing (200) so that the housing (200) can change shape in response to pressure changes in the storage space (200S).

[0129] FIG. 18 is a perspective view showing a part of a housing according to one embodiment of the present invention. FIG. 19 is an exploded perspective view of a part of the housing of FIG. 18. In particular, FIG. 18 and FIG. 19 show the configuration of the top frame (210) of the housing (200). FIG. 20 and FIG. 21 are a cross-sectional perspective view and a cross-sectional view showing the view cut along the cutting line F-F' of FIG. 18.

[0130] Referring to FIGS. 16 to 21 together, the structure of a shaped portion (300) having a concave portion (310) and a convex portion (320) is illustrated as an embodiment of the present invention. The shaped portion (300) according to the present embodiment may be in a continuously connected form. FIGS. 18 to 21 is shown as an example in which the concave portion (310) and the convex portion (320) are each in a continuously connected form. Additionally, the shaped portion (300) may be in a continuously connected form having a closed-loop shape. FIGS. 18 to 21 is shown as an example in which the concave portion (310) and the convex portion (320) are each in a continuously connected form having a closed-loop shape. In the present invention, having a closed-loop shape may mean that the shape portion (300) has a closed structure in which the starting point and the ending point meet while being continuously connected without interruption. However, there are no special restrictions on the specific shape of the closed structure. Referring to FIGS. 16 to 21, it is shown that the shape portion (300) has a circular closed-loop structure.

[0131] As the shape portion (300) is continuously connected and forms a closed loop structure, it can have significant advantages in terms of isotropic stress distribution and sealing stability, going beyond simply relieving stress in a specific direction on one side of the housing (200).

[0132] When a pressure change occurs in the storage space (200S), the stress applied to the housing (200) may occur in all directions on the plane, rather than in a specific straight line direction. The shape portion (300) having a closed loop structure can uniformly absorb and disperse expansion pressure coming from all directions, not limited to a specific direction. By preventing the stress concentration phenomenon in which the stress of the housing (200) due to the pressure change in the storage space (200S) is directed toward a specific direction, the distortion of the housing (200) and the applied load can be minimized.

[0133] In addition, conventional wrinkle patterns have disconnected starting and ending points, and since these starting or ending points are structurally weak, stress is prone to concentration. On the other hand, as in the present embodiment, a shape part (300) that implements a continuously connected closed loop structure can have the effect of structurally eliminating disconnected starting or ending points. Accordingly, it is possible to prevent cracks from occurring in the housing (200) itself due to stress concentration at specific points, and the structural durability of the entire housing (200) can be significantly improved even when there is a change in pressure in the storage space (200S) due to a change in the volume of the cooling material.

[0134] In addition, as the concave portion (310) and the convex portion (320) are each connected in succession to form a closed loop structure, it is possible to respond more flexibly to pressure changes in the storage space (200S). Furthermore, the shape portion (300) can form a closed loop structure by connecting in a circular manner. For example, at least one of the concave portion (310) or the convex portion (320) can form a closed loop structure by connecting in a circular manner. A closed loop structure connected in a circular manner can more effectively distribute stress in the isotropic direction.

[0135] The closed loop may have a shape that matches the outer shape of the member equipped with the shaped portion (300). The member equipped with the shaped portion (300) shown in FIGS. 18 to 21 may have a circular shape, and the closed loop may have a circular shape that matches this. By having the closed loop have a shape that matches the outer shape of the member equipped with the shaped portion (300), the shaped portion (300) can be implemented throughout the member equipped with the shaped portion (300), and the area of ​​the shaped portion (300) capable of absorbing pressure changes can be increased. Accordingly, the shaped portion (300) can absorb and control pressure changes more effectively and flexibly in the storage space (200S).

[0136] There are no specific restrictions on the method of providing the shaped portion (300) in the housing (200). For example, a hole (200H) may be formed in the housing (200), and the shaped portion (300) may be mounted in the hole (200H). The member equipped with the shaped portion (300) shown in FIG. 19 (the circular member in FIG. 19) may be a separate member having a different material from the housing (200). By providing a hole (200H) in the housing (200) and mounting a member equipped with the shaped portion (300) in the hole (200H), the shaped portion (300) can be provided in the housing (200).

[0137] There are no specific restrictions on the method of mounting the member equipped with the shaped portion (300) into the hole (200H). For example, the member equipped with the shaped portion (300) can be mounted into the hole (200H) of the housing (200) using a fixing bracket (400). After positioning the member equipped with the shaped portion (300) between the fixing bracket (400) and one side of the housing (200), the member equipped with the shaped portion (300) can be fixed to the housing (200) by joining the fixing bracket (400) and the housing (200) using a bolt or the like. As illustrated in FIG. 19, a hole (200H) may be formed in the top frame (210) of the housing (200), and a member having a shaped portion (300) may be positioned between the fixing bracket (400) and the top frame (210), and the fixing bracket (400) may be connected to the top frame (210) by means of a bolt or the like. However, this is an exemplary structure, and as another example, the member having the shaped portion (300) may be mounted to the housing (200) using an adhesive or the like.

[0138] FIG. 22 is a perspective view showing a part of a housing according to an embodiment of the present invention. FIG. 23 is a cross-sectional perspective view showing a section cut along the cutting line G-G' of FIG. 22. FIG. 24 is a perspective view showing a part of the housing of FIG. 22 from a different angle.

[0139] Referring to FIGS. 16, 17, and FIGS. 22 through 24, the housing (200) may include a top frame (210) and a bottom frame (220) that form a storage space (200S). The top frame (210) may be located above the battery cells (110), and the bottom frame (220) may be located below the battery cells (110).

[0140] A housing (200) according to one embodiment may include a middle frame (230) located between a top frame (210) and a bottom frame (220). A storage space (200S) according to this embodiment may be created by combining the top frame (210), the bottom frame (220), and the middle frame (230). The storage space (200S) may be covered by the top frame (210), the bottom frame (220), and the middle frame (230). Additionally, the storage space (200S) may be sealed by the top frame (210), the bottom frame (220), and the middle frame (230). Battery cells (110) according to this embodiment may be placed in a sealed state within the storage space (200S) surrounded by the top frame (210), the bottom frame (220), and the middle frame (230), and a cooling material may be filled into this storage space (200S). There are no special restrictions on the combination form of the top frame (210), bottom frame (220), and middle frame (230), and various methods such as physical restraint methods like bolt fastening or interlocking, adhesives, and welding may be applied, taking into account the material or thickness applied to the housing (200).

[0141] The housing (200) may include side wall portions (200W) that cover the side of the storage space (200S). Additionally, the housing (200) may include a busbar mounting portion (200B). The battery assembly (100) may include a busbar (131) electrically connected to terminal portions (111, 112) of the battery cell (110), and the busbar (131) may be placed in the busbar mounting portion (200B). In one embodiment, the side wall portions (200W) and the busbar mounting portion (200B) may be included in the middle frame (230) of the housing (200). The middle frame (230) according to the present embodiment may be a structure in which the side wall portions (200W) and the busbar mounting portion (200B) are integrated. As illustrated in FIG. 24, the space enclosed by the side walls (200W) of the middle frame (230) and the busbar mounting portion (200B) may correspond to at least a part of the storage space (200S), and the battery cells (110) may be located in this storage space (200S).

[0142] FIG. 25 is a partial drawing showing an enlarged view of the “H” portion of FIG. 17.

[0143] Referring together to FIGS. 16, 17, and FIGS. 22 to 25, a battery assembly (100) according to one embodiment of the present invention may include a busbar assembly (130) electrically connected to terminal portions (111, 112) of a battery cell (110).

[0144] Battery cells (110) may be electrically connected to each other in series or parallel via a busbar assembly (130). The busbar assembly (130) may include a busbar (131) that is electrically connected to terminal portions (111, 112) of the battery cells (110). The busbar (131) may be located on a busbar mounting portion (200B) of the housing (200).

[0145] A busbar mounting hole (200BH) may be formed in the busbar mounting portion (200B). The terminal portions (111, 112) of the battery cell (110) may be electrically connected to the busbar assembly (130) through the busbar mounting hole (200BH). The terminal portions (111, 112) of the battery cell (110) may be electrically connected to the busbar (131) through the busbar mounting hole (200BH).

[0146] Grooves for mounting busbars (131) may be provided on the busbar mounting portion (200B), and the busbars (131) may be mounted in these grooves. The terminal portions (111, 112) of the battery cell (110) may be exposed to the upper part of the busbar mounting portion (200B) through the busbar mounting portion hole (200BH), and the terminal portions (111, 112) exposed through the busbar mounting portion hole (200BH) may be connected to the busbar (131).

[0147] The busbar assembly (130) according to the present embodiment may include a wire (134) connecting the terminal portions (111, 112) of the battery cell (110) and the busbar (131). The wire (134) may include a metal material having electrical conductivity.

[0148] The terminal portions (111, 112) exposed through the busbar mounting hole (200BH) can be connected to one end of the wire (134). The other end of the wire (134) can be connected to the busbar (131). However, this is an exemplary structure in which the terminal portions (111, 112) of the battery cell (110) are electrically connected to the busbar assembly (130) through the busbar mounting hole (200BH), and other forms of electrical connection may be applied.

[0149] Meanwhile, a housing (200) according to one embodiment of the present invention may include recessed portions (200D) that are recessed in the opposite direction to the direction in which the storage space (200S) is located. Each of the battery cells (110) may be inserted into the recessed portion (200D). The recessed portion (200D) may be provided in the busbar mounting portion (200B) of the housing (200). Meanwhile, busbar mounting portion holes (200BH) may be provided in the busbar mounting portion (200B), and the busbar mounting portion holes (200BH) may be provided in the recessed portion (200D). The description of the recessed portion (200D) is omitted as it overlaps with the previously described content.

[0150] FIG. 26 is a perspective view showing a battery assembly according to an embodiment of the present invention. FIG. 27 is an exploded perspective view of the battery assembly of FIG. 26. FIG. 28 is a top view of a part of a housing according to an embodiment of the present invention. In particular, FIG. 28 is a top view of the configuration of the top frame (210) of the housing (200). FIG. 29 is a cross-sectional view showing a cut along the cutting line I-I' of FIG. 28.

[0151] Referring to FIGS. 26 to 29, a battery assembly (100) according to one embodiment of the present invention comprises: a plurality of battery cells (110); a housing (200) having a storage space (200S) in which the battery cells (110) are stored; and a cooling material located in the storage space (200S) and in contact with the battery cells (110). At least one shaped portion (300, Shaped Portion) having at least one of a concave portion or a convex portion is provided in the housing (200). The shaped portion (300) according to the present embodiment may include a concave portion (310) and a convex portion (320).

[0152] Battery cells (110) can be stored in a storage space (200S) of a housing (200), and a cooling material can be filled into this storage space (200S). Although not specifically illustrated, the cooling material may be located together with the battery cells (110) in the storage space (200S) inside the housing (200) and may come into direct contact with the outer surface of the battery cells (110).

[0153] In this embodiment, at least one shaped part (300) having a concave part (310) and a convex part (320) is provided in the housing (200). When the volume of the cooling material changes and the pressure of the storage space (200S) inside the housing (200) changes accordingly, the shape of the shaped part (300) can change. Through the action of at least one of the concave part (310) or the convex part (320) expanding and contracting, the shaped part (300) can absorb the pressure change of the storage space (200S) and reduce the load applied to the housing (200). Ultimately, even if the volume of the cooling material changes, damage to the housing (200) and subsequent leakage of the cooling material can be prevented. At least one of the concave portion (310) or the convex portion (320) can act as a kind of wrinkle in the housing (200), and flexibility can be added to the housing (200) so that the housing (200) can change shape in response to pressure changes in the storage space (200S).

[0154] The housing (200) according to the present embodiment may include a top frame (210) and a bottom frame (220) that form a storage space (200S). The top frame (210) may be located above the battery cells (110), and the bottom frame (220) may be located below the battery cells (110). The bottom frame (220) may include four side wall sections (200W). The storage space (200S) may be covered by the top frame (210) and the bottom frame (220). Additionally, the storage space (200S) may be sealed by the top frame (210) and the bottom frame (220). The battery cells (110) according to the present embodiment may be placed in a sealed state within a storage space (200S) surrounded by a top frame (210) and a bottom frame (220), and a cooling material may be filled into this storage space (200S). In the present embodiment, the illustration of the busbar mounting portion and the busbar assembly has been omitted.

[0155] FIG. 30 is a diagram showing a disassembled portion of a housing according to one embodiment of the present invention. In particular, FIG. 30 is a hypothetical diagram showing the configuration of the top frame (210) of the housing (200) disassembled into four regions.

[0156] Referring to FIGS. 26 to 30, the structure of a shaped portion (300) having a concave portion (310) and a convex portion (320) is illustrated as an embodiment of the present invention. The shaped portion (300) according to the present embodiment may be in a continuously connected form. FIGS. 26 to 30 is shown as an example in which the concave portion (310) and the convex portion (320) are each in a continuously connected form. Additionally, the shaped portion (300) may be in a continuously connected form having a closed-loop shape. FIGS. 26 to 30 is shown as an example in which the concave portion (310) and the convex portion (320) are each in a continuously connected form having a closed-loop shape. In the present invention, having a closed-loop shape may mean that the shape portion (300) has a closed structure in which the starting point and the ending point meet while being continuously connected without interruption. However, there are no specific limitations on the specific shape of the closed structure. Referring to FIGS. 26 to 30, it is shown that the shape portion (300) has a rectangular closed-loop structure. As the shape portion (300) is continuously connected and forms a closed-loop structure, it can have significant advantages in terms of isotropic stress distribution and sealing stability, going beyond simply relieving stress in a specific direction on one side of the housing (200).

[0157] Meanwhile, the shaped portion (300) according to the present embodiment may be formed by deforming the shape of a part of the housing (200). For example, the shaped portion (300) may be formed by deforming the shape of the top frame (210), which is a part of the housing (200). The shaped portion (300) may be provided in the housing (200) by implementing a concave portion (310) and a convex portion (320) in the top frame (210) itself.

[0158] Additionally, the closed loop may have a shape that matches the outer shape of the member equipped with the shaped portion (300). The member equipped with the shaped portion (300) shown in FIGS. 26 to 30, i.e., the top frame (210), itself may have a rectangular shape, and the closed loop of the shaped portion (300) may have a rectangular shape to match this. By having the closed loop have a shape that matches the outer shape of the member equipped with the shaped portion (300), the shaped portion (300) can be implemented throughout the member equipped with the shaped portion (300), and the area of ​​the shaped portion (300) capable of absorbing pressure changes can be increased. Accordingly, the shaped portion (300) can absorb and control pressure changes more effectively and flexibly in the storage space (200S). For example, a rectangular top frame (210) can be divided into four regions in which the concave (310) or convex (320) shaped portions (300) are connected in different directions. For convenience of explanation, FIG. 30 illustrates a virtual view in which the four regions of the top frame (210) are separated from each other. As the four regions in which the shaped portions (300) are connected in different directions are connected as one, a plurality of shaped portions (300) of a closed loop that have a rectangular shape when viewed from above can be realized. Accordingly, the shaped portions (300) can be provided throughout the top frame (210), which means that the area of ​​the shaped portions (300) capable of absorbing pressure changes in the storage space (200S) can be maximized.

[0159] FIG. 31 is a perspective view showing a battery assembly according to one embodiment of the present invention. FIG. 32 is an exploded perspective view of the battery assembly of FIG. 31.

[0160] Referring to FIGS. 31 and 32, a battery assembly (100) according to one embodiment of the present invention comprises: a plurality of battery cells (110); a housing (200) having a storage space (200S) in which the battery cells (110) are stored; and a cooling material located in the storage space (200S) and in contact with the battery cells (110). At least one shaped portion (300, Shaped Portion) having at least one of a concave portion or a convex portion is provided in the housing (200). The shaped portion (300) according to the present embodiment may include a concave portion (310) and a convex portion (320).

[0161] Battery cells (110) can be stored in a storage space (200S) of a housing (200), and a cooling material can be filled into this storage space (200S). Although not specifically illustrated, the cooling material may be located together with the battery cells (110) in the storage space (200S) inside the housing (200) and may come into direct contact with the outer surface of the battery cells (110).

[0162] In this embodiment, at least one shaped part (300) having a concave part (310) and a convex part (320) is provided in the housing (200). When the volume of the cooling material changes and the pressure of the storage space (200S) inside the housing (200) changes accordingly, the shape of the shaped part (300) can change. Through the action of at least one of the concave part (310) or the convex part (320) expanding and contracting, the shaped part (300) can absorb the pressure change of the storage space (200S) and reduce the load applied to the housing (200). Ultimately, even if the volume of the cooling material changes, damage to the housing (200) and subsequent leakage of the cooling material can be prevented. At least one of the concave portion (310) or the convex portion (320) can act as a kind of wrinkle in the housing (200), and flexibility can be added to the housing (200) so that the housing (200) can change shape in response to pressure changes in the storage space (200S).

[0163] The housing (200) according to the present embodiment may include a top frame (210) and a bottom frame (220) that form a storage space (200S). The top frame (210) may be located above the battery cells (110), and the bottom frame (220) may be located below the battery cells (110). The bottom frame (220) may include six side wall sections (200W). The storage space (200S) may be covered by the top frame (210) and the bottom frame (220). Additionally, the storage space (200S) may be sealed by the top frame (210) and the bottom frame (220). The battery cells (110) according to the present embodiment may be placed in a sealed state within a storage space (200S) surrounded by a top frame (210) and a bottom frame (220), and a cooling material may be filled into this storage space (200S). In the present embodiment, the illustration of the busbar mounting portion and the busbar assembly has been omitted.

[0164] As an embodiment of the present invention, the shape portion (300) may include a concave portion (310) and a convex portion (320). The shape portion (300) according to the present embodiment may be in a continuously connected form. FIGS. 31 and 32 illustrate examples in which the concave portion (310) and the convex portion (320) are each in a continuously connected form. Additionally, the shape portion (300) may have a closed-loop shape and be in a continuously connected form. FIGS. 31 and 32 illustrate examples in which the concave portion (310) and the convex portion (320) each have a closed-loop shape and are continuously connected form. In the present invention, having a closed-loop shape may mean that the shape portion (300) has a closed structure in which the starting point and the ending point meet while being continuously connected without interruption. However, there are no special limitations on the specific shape of the closed structure. Referring to FIGS. 31 and 32, it is shown that the shape portion (300) has a hexagonal closed-loop structure. As the shape portion (300) is continuously connected to form a closed-loop structure, it can have significant advantages in terms of isotropic stress distribution and sealing stability, going beyond simply relieving stress in a specific direction on one side of the housing (200).

[0165] The shaped portion (300) according to the present embodiment may be formed by deforming the shape of a part of the housing (200). For example, the shaped portion (300) may be formed by deforming the shape of the top frame (210), which is a part of the housing (200). The shaped portion (300) may be provided in the housing (200) by implementing a concave portion (310) and a convex portion (320) in the top frame (210) itself.

[0166] Additionally, the closed loop may have a shape that matches the outer shape of the member equipped with the shape portion (300). The member equipped with the shape portion (300) shown in FIGS. 31 and 32, i.e., the top frame (210), itself may have a hexagonal shape, and the closed loop of the shape portion (300) may have a hexagonal shape to match this. By having the closed loop have a shape that matches the outer shape of the member equipped with the shape portion (300), the shape portion (300) can be implemented throughout the member equipped with the shape portion (300), and the area of ​​the shape portion (300) capable of absorbing pressure changes can be increased. Accordingly, the shape portion (300) can absorb and control pressure changes more effectively and flexibly in the storage space (200S). For example, a hexagonal top frame (210) can be divided into six regions in which the concave (310) or convex (320) shape portions (300) are connected in different directions. As the six regions in which the shape portions (300) are connected in different directions are connected as one, multiple shape portions (300) of a closed loop that have a hexagonal shape when viewed from above can be realized. Accordingly, shape portions (300) can be provided throughout the top frame (210), which means that the area of ​​the shape portions (300) capable of absorbing pressure changes in the storage space (200S) can be maximized.

[0167] FIG. 33 is a perspective view showing a battery assembly according to an embodiment of the present invention. FIG. 34 is an exploded perspective view of the battery assembly of FIG. 33. FIG. 35 is a cross-sectional view showing a cross section cut along the cutting line J-J' of FIG. 33.

[0168] Referring to FIGS. 33 to 35, a battery assembly (100) according to one embodiment of the present invention comprises: a plurality of battery cells (110); a housing (200) having a storage space (200S) in which the battery cells (110) are stored; and a cooling material located in the storage space (200S) and in contact with the battery cells (110). At least one shaped portion (300, Shaped Portion) having at least one of a concave portion or a convex portion is provided in the housing (200). The shaped portion (300) according to the present embodiment may include a convex portion (320).

[0169] Battery cells (110) can be stored in a storage space (200S) of a housing (200), and a cooling material can be filled into this storage space (200S). Although not specifically illustrated, the cooling material may be located together with the battery cells (110) in the storage space (200S) inside the housing (200) and may come into direct contact with the outer surface of the battery cells (110).

[0170] In this embodiment, at least one shaped portion (300) having a convex portion (320) is provided in the housing (200). When the volume of the cooling material changes and the pressure of the storage space (200S) inside the housing (200) changes accordingly, the shape of the shaped portion (300) can change. Through the action of the convex portion (320) expanding and contracting, the shaped portion (300) can absorb the pressure change of the storage space (200S) and reduce the load applied to the housing (200). Ultimately, even if the volume of the cooling material changes, damage to the housing (200) and the resulting leakage of the cooling material can be prevented. The convex portion (320) can act as a kind of wrinkle shape in the housing (200), and flexibility can be added to the housing (200) so that the shape of the housing (200) can be deformed in response to the pressure change of the storage space (200S).

[0171] FIG. 36 is a perspective view showing a part of a housing according to an embodiment of the present invention. In particular, FIG. 36 shows the configuration of a top frame (210) of a housing (200). FIG. 37 is a cross-sectional view showing a cross-section cut along the cutting line K-K' of FIG. 36.

[0172] Referring to FIGS. 33 to 37 together, the structure of a shaped portion (300) having a convex portion (320) is illustrated as an embodiment of the present invention. The shaped portion (300) according to the present embodiment may be provided in a plurality, and the shaped portions (300) may be separated from each other. The shaped portions (300) may have a dimple shape. FIGS. 33 to 37 illustrates a configuration in which a plurality of shaped portions (300) having a circular dimple shape are provided.

[0173] When a pressure change occurs in the storage space (200S), stress may be applied differently to each zone of the housing (200) instantaneously. Different levels of stress may be applied to each zone of the housing (200) in a fleeting moment. In this embodiment, separate shaped parts (300) may be distributed and arranged on one surface of the housing (200). These shaped parts (300) can actively respond to minute differences in stress in each zone. The independently separated shaped parts (300) can provide minute elasticity at each point while maintaining the overall rigidity of the housing (200). In addition, stress is not concentrated at one point but is distributed among multiple shaped parts (300), thereby preventing cracks or fatigue failure from occurring in the housing (200).

[0174] The shaped portions (300) according to the present embodiment may be formed by deforming the shape of a part of the housing (200). For example, the shaped portions (300) may be formed by deforming the shape of the top frame (210), which is a part of the housing (200). The shaped portions (300) may be provided in the housing (200) by implementing a concave portion (310) or a convex portion (320) in the top frame (210) itself. As shown in FIGS. 36 and 37, the concave portion (310) or the convex portion (320) may be implemented by deforming the shape of the top frame (210) itself. Accordingly, the shaped portions (300), which are separated from each other and capable of absorbing pressure changes in the storage space (200S), may be distributed across one surface of the housing (200), for example, the entire surface of the top frame (210).

[0175] FIG. 38 is a perspective view showing a part of a housing according to an embodiment of the present invention. In particular, FIG. 38 shows the configuration of a middle frame (230) of a housing (200). FIG. 39 is a cross-sectional perspective view showing a view cut along the cutting line L-L' of FIG. 38. FIG. 40 is a perspective view showing a part of the housing of FIG. 38 from a different angle.

[0176] Referring to FIGS. 33 to 40, the housing (200) may include a top frame (210) and a bottom frame (220) that form a storage space (200S). The top frame (210) may be located above the battery cells (110), and the bottom frame (220) may be located below the battery cells (110).

[0177] A housing (200) according to one embodiment may include a middle frame (230) located between a top frame (210) and a bottom frame (220). A storage space (200S) according to this embodiment may be created by combining the top frame (210), the bottom frame (220), and the middle frame (230). The storage space (200S) may be covered by the top frame (210), the bottom frame (220), and the middle frame (230). Additionally, the storage space (200S) may be sealed by the top frame (210), the bottom frame (220), and the middle frame (230). Battery cells (110) according to this embodiment may be placed in a sealed state within the storage space (200S) surrounded by the top frame (210), the bottom frame (220), and the middle frame (230), and a cooling material may be filled into this storage space (200S). There are no special restrictions on the combination form of the top frame (210), bottom frame (220), and middle frame (230), and various methods such as physical restraint methods like bolt fastening or interlocking, adhesives, and welding may be applied, taking into account the material or thickness applied to the housing (200).

[0178] The housing (200) may include side wall portions (200W) that cover the side of the storage space (200S). Additionally, the housing (200) may include a busbar mounting portion (200B). The battery assembly (100) may include a busbar electrically connected to the terminal portions (111, 112) of the battery cell (110), and the busbar may be placed in the busbar mounting portion (200B). In one embodiment, the side wall portions (200W) and the busbar mounting portion (200B) may be included in the middle frame (230) of the housing (200). The middle frame (230) according to the present embodiment may be a structure in which the side wall portions (200W) and the busbar mounting portion (200B) are integrated. As illustrated in FIG. 40, the space enclosed by the side walls (200W) of the middle frame (230) and the busbar mounting portion (200B) may correspond to at least a part of the storage space (200S), and the battery cells (110) may be located in this storage space (200S). However, this is just one example, and as another example, the side walls (200W) may be provided on the top frame (210) or the bottom frame (220), and as yet another example, the busbar mounting portion (200B) may be provided on the top frame (210).

[0179] Meanwhile, a housing (200) according to one embodiment of the present invention may include recessed portions (200D) that are recessed in the opposite direction to the direction in which the storage space (200S) is located. Each of the battery cells (110) may be inserted into the recessed portion (200D). The recessed portion (200D) may be provided in the busbar mounting portion (200B) of the housing (200). Meanwhile, busbar mounting portion holes (200BH) may be provided in the busbar mounting portion (200B), and the busbar mounting portion holes (200BH) may be provided in the recessed portion (200D). The description of the recessed portion (200D) is omitted as it overlaps with the previously described content.

[0180] Meanwhile, although not specifically illustrated, the housing (200) in the present invention may include a cooling port that guides the movement of a cooling material. The cooling port according to one embodiment of the present invention may be a tubular member whose opening and closing are controlled. As the cooling port is closed, the storage space (200S) may be sealed. The cooling material may remain filled in the storage space (200S) inside the sealed housing (200) without circulating. The battery assembly (100) according to the present embodiment may be an immersion cooling non-circulation type, and the cooling port may be used only for initial charging and replenishment.

[0181] A cooling port according to another embodiment of the present invention may include an inlet and an outlet, and accordingly, a cooling material may be circulated. Each of the inlet and the outlet may have a coupling structure connected to an external cooling system. The cooling material may be introduced into a storage space (200S) inside the housing (200) through the inlet, come into contact with the battery cells (110), and cool the battery cells (110). Subsequently, the cooling material may be moved to the outside of the battery assembly (100) through the outlet.

[0182] The features in the embodiments described in this invention can be combined with one another as long as no technical conflicts occur.

[0183] In this embodiment, terms indicating directions such as front, back, left, right, up, and down have been used; however, these terms are for convenience of explanation only and may vary depending on the location of the object or the position of the observer.

[0184] One or more battery assemblies according to the embodiment described above can be mounted on a device together with various control and protection systems, such as a Battery Management System (BMS), a Battery Disconnect Unit (BDU), and a cooling system.

[0185] The above battery assembly can be applied to various devices. Specifically, it can be applied to means of transportation such as electric bicycles, electric vehicles, and hybrids, or to Energy Storage Systems (ESS), but is not limited thereto and can be applied to various devices capable of using secondary batteries.

[0186] Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

[0187] Explanation of the symbols

[0188] 100: Battery assembly

[0189] 110: Battery cell

[0190] 200: Housing

[0191] 200S: Storage space

[0192] 300: Shape part

[0193] 310: Concave part

[0194] 320: Convex part

[0195] 400: Fixed bracket

Claims

1. Multiple battery cells; A housing having a storage space for storing the above battery cells; and A cooling material located in the storage space and in contact with the battery cells; comprising A battery assembly having at least one shaped portion having at least one of a concave portion or a convex portion provided in the housing.

2. In Paragraph 1, The above-mentioned shape portion is a battery assembly including the concave portion or the convex portion.

3. In Paragraph 1, The above-mentioned shaped portion is a battery assembly including the concave portion and the convex portion.

4. In Paragraph 1, The above-mentioned shape is a battery assembly in a continuously connected form.

5. In Paragraph 4, A battery assembly having a closed loop shape and a continuously connected form.

6. In Paragraph 1, A battery assembly in which the above-mentioned shaped parts are provided in plurality and the shaped parts are separated from each other.

7. In Paragraph 1, The above storage space is a battery assembly sealed by the above housing.

8. In Paragraph 1, The above-mentioned shaped portion is a battery assembly provided on the upper surface of the housing.

9. In Paragraph 1, The above battery cell includes a terminal portion, and A bus bar is provided that is electrically connected to the terminal portions of the battery cells, and The above housing includes a busbar seating portion on which the busbar is disposed, and The above-mentioned busbar mounting portion is a battery assembly located between the housing portion equipped with the above-mentioned shaped portion and the battery cells.

10. In Paragraph 1, A battery assembly in which a hole is formed in the housing and a shaped part is mounted in the hole.

11. In Paragraph 1, The above-mentioned shaped portion is a battery assembly formed by deforming the shape of a part of the housing.

12. A device comprising a battery assembly according to paragraph 1.

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