Battery pack and device including same

Abstract

A battery pack according to an embodiment of the present invention includes: a battery assembly including a plurality of battery cells including a venting part; a pack frame in which the battery assembly is accommodated; a plate facing the venting part of the battery cells; and a cooling material which is in direct contact with the battery cells and circulates inside the battery assembly. A venting channel for guiding venting gas discharged from the venting part is formed at least one of inside the pack frame or in a space between the plate and the pack frame.

Description

Battery pack 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. 10-2024-0174522 filed November 29, 2024 and Korean Patent Application No. 10-2025-0135083 filed September 19, 2025, 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 pack and a device including the same, and more specifically, to a battery pack with improved safety and cooling performance and a device including the same.

[0004] In modern society, as the use of portable devices such as mobile phones, laptops, camcorders, and digital cameras has become commonplace, the development of technologies related to such mobile devices is becoming active. Furthermore, rechargeable secondary batteries are being utilized as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) as a solution to address air pollution caused by conventional gasoline vehicles using fossil fuels; consequently, the need for the development of secondary batteries is increasing.

[0005] Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion batteries are gaining attention for their advantages, such as the ability to charge and discharge freely with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density.

[0006] These lithium secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative active materials, respectively. The lithium secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and a battery case that seals and houses the electrode assembly together with an electrolyte.

[0007] Generally, lithium secondary batteries can be classified according to the shape of the casing into can-type secondary batteries, in which the electrode assembly is embedded in a metal can, and pouch-type secondary batteries, in which the electrode assembly is embedded in a pouch of aluminum laminate sheet.

[0008] In the case of secondary batteries used in small devices, 2 to 3 battery cells are arranged, whereas in the case of secondary batteries used in medium to large devices such as automobiles, battery modules in which multiple battery cells are electrically connected are used. In such battery modules, capacity and output are improved by connecting multiple battery cells in series or parallel to form a stack of battery cells. In addition, one or more battery modules can be mounted together with various control and protection systems, such as a Battery Disconnect Unit (BDU), a Battery Management System (BMS), and a cooling system, to form a battery pack.

[0009] The internal pressure of a battery cell may increase upon overcharging, overheating, or physical damage, in which case gas or particles may be released through the venting section. If these gases or particles are not properly treated, they may have a negative impact on the performance and safety of the battery pack.

[0010] In conventional battery packs, gases or particles emitted from the venting section can remain around the battery cells, affecting other cells and potentially degrading the stability of the entire system. Furthermore, these emitted gases or particles can damage other components within the battery pack. Therefore, a technology is required to effectively guide and discharge these gases or particles to the outside.

[0011] The problem that the present invention aims to solve is to provide a battery pack that effectively discharges gas or particles generated in a battery cell and a device including the same.

[0012] 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.

[0013] A battery pack according to one embodiment of the present invention comprises: a battery assembly including a plurality of battery cells each including a venting portion; a pack frame in which the battery assembly is housed; a plate facing the venting portion of the battery cells; a cooling material circulating inside the battery assembly while in direct contact with the battery cells; and a waterproof adhesive separating the venting portion of the battery cell from the cooling material. A venting channel is formed in at least one of the space between the plate and the pack frame, or inside the pack frame, to guide the venting gas discharged from the venting portion.

[0014] The above venting channel can be placed at the bottom of the battery cells.

[0015] The above venting channel may be located between the plate and the pack frame.

[0016] The above venting channel can be connected to a venting device provided in the pack frame.

[0017] The above waterproof adhesive can cover at least a portion of one side of the battery cell where the venting portion is located.

[0018] The waterproof adhesive can cover a part of the side surface of the battery cell.

[0019] The thickness of the waterproof adhesive can be 1 mm or more and 6 mm or less.

[0020] The waterproof adhesive can be applied to the surface of the plate that faces the bending part of the battery cells.

[0021] The battery assembly may include a cell frame covering at least a part of the battery cell, and the cell frame may include a bottom cell frame located on one side of the plate.

[0022] The bottom cell frame and the plate may be separate structures from each other.

[0023] The bottom cell frame may include a bottom cell frame hole corresponding to the bending part of the battery cell. The plate can cover the bottom cell frame hole.

[0024] The plate can be 0.5 mm or more and 1.0 mm or less in thickness and may include a metal material.

[0025] The plate can be an injection molding product with a thickness of 1.0 mm or more and 2.0 mm or less.

[0026] The plate may be positioned to correspond to the bending part and include a notch part that ruptures at a pressure of a certain level or more.

[0027] The notch part can have a circular or cross (十) or X shape.

[0028] The thickness of the notch part can be 0.25 mm or more and 0.5 mm or less.

[0029] The battery assembly may include an inlet port and an outlet port for circulating the cooling material.

[0030] The battery assembly further includes a cell frame covering at least a portion of the battery cell, the cell frame including a top cell frame, a middle cell frame, and a bottom cell frame, and the cooling material can be introduced into the space between the middle cell frame and the bottom cell frame through the inlet, pass through the space between the middle cell frame and the top cell frame, and be discharged through the outlet.

[0031] A battery pack according to another embodiment of the present invention further comprises a Battery Disconnect Unit (BDU) module for controlling the electrical connection of the battery cells; and a Battery Management System (BMS) module for monitoring and controlling the operation of the battery cells, wherein the BDU module and the BMS module may be disposed between the venting channel and the venting device provided in the pack frame.

[0032] According to another embodiment of the present invention, a device including the battery pack is provided.

[0033] According to embodiments of the present invention, gas or flames can be easily discharged to the outside of the battery assembly or battery pack when a battery cell ignites. This improves the safety of the battery pack. Additionally, by cooling the upper and lower surfaces of the battery cell more effectively, cooling efficiency is improved, thereby ensuring the safety of the battery module and battery pack.

[0034] 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.

[0035] FIG. 1 is a perspective view showing a battery pack according to one embodiment of the present invention.

[0036] Figure 2 is a plan view showing the battery pack of Figure 1.

[0037] Figure 3 is a plan view showing the battery pack of Figure 1 viewed from a different angle than that of Figure 2.

[0038] Figure 4 is an exploded perspective view showing the battery pack of Figure 1.

[0039] FIG. 5 is a perspective view of a battery assembly according to one embodiment of the present invention.

[0040] Figure 6 is an exploded perspective view showing the battery assembly of Figure 5.

[0041] FIG. 7 is a perspective view of a battery cell according to one embodiment of the present invention.

[0042] Fig. 8 is a perspective view of the battery cell of Fig. 7 viewed from a different angle.

[0043] Figure 9 is a cross-sectional view showing the cut along the cutting line A-A' of Figure 2.

[0044] Figure 10 is an enlarged view showing the “B” portion of Figure 9.

[0045] FIG. 11 is a partial perspective view of the battery pack of FIG. 1 with the pack cover removed, viewed from a different angle.

[0046] Figure 12 is an enlarged view showing the “C” portion of Figure 9.

[0047] FIG. 13 is a partial cross-sectional perspective view showing the cut along the cutting line A-A' of FIG. 2.

[0048] FIG. 14 is a partial cross-sectional view showing a part of the cut along the cutting line A-A' of FIG. 2.

[0049] FIG. 15 is a plan view showing a bottom cell frame according to one embodiment of the present invention.

[0050] Figure 16 is an enlarged view showing the “D” portion of Figure 15.

[0051] FIG. 17 is an exploded perspective view of battery cells, a waterproof adhesive, a plate, and a bottom cell frame according to one embodiment of the present invention.

[0052] FIG. 18 is a perspective view showing the assembled state of the battery cells, waterproof adhesive, plate, and bottom cell frame according to FIG. 17.

[0053] FIG. 19 is a cross-sectional view showing a cross-section cut along the cutting line H-H' of FIG. 18.

[0054] FIG. 20 is a partial cross-sectional view showing an enlarged view of section “I” of FIG. 19.

[0055] FIG. 21 is a plan view showing a plate according to one embodiment of the present invention.

[0056] FIG. 22 is a cross-sectional view showing the cut along the cutting line E-E' of FIG. 21.

[0057] FIG. 23 is a plan view showing embodiments of the notching portion of the present invention.

[0058] FIG. 24 is a plan view showing the battery assembly of FIG. 5.

[0059] FIG. 25 is a plan view showing the battery assembly of FIG. 24 viewed from a different angle.

[0060] FIG. 26 is a partial perspective view showing the battery assembly of FIG. 5.

[0061] FIG. 27 is a cross-sectional view showing a portion of the cross-section cut along the cutting line F-F' of FIG. 24.

[0062] FIG. 28 is a partial cross-sectional view showing a part of the cross-section cut along the cutting line G-G' of FIG. 24.

[0063] FIG. 29 is a cross-sectional view showing a portion of the cross-section of the battery assembly including the connection hole.

[0064] FIG. 30 is a cross-sectional view showing the entire cross section cut along the cutting line F-F' of FIG. 24, unlike FIG. 27.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] FIG. 1 is a perspective view showing a battery pack (1000) according to an embodiment of the present invention. FIG. 2 is a plan view showing the battery pack of FIG. 1. FIG. 3 is a plan view showing the battery pack (1000) of FIG. 1 viewed from an angle different from FIG. 2. FIG. 4 is an exploded perspective view showing the battery pack (1000) of FIG. 1. FIG. 5 is a perspective view of a battery assembly (100) according to an embodiment of the present invention. FIG. 6 is an exploded perspective view showing the battery assembly (100) of FIG. 5. FIG. 7 is a perspective view of a battery cell (110) according to an embodiment of the present invention. FIG. 8 is a perspective view of the battery cell (110) of FIG. 7 viewed from a different angle. Specifically, FIG. 8 is a perspective view showing the battery cell (110) of FIG. 7 viewed from the -z-axis direction of FIG. 7. FIG. 9 is a cross-sectional view showing the cut along the cutting line A-A' of FIG. 2. FIG. 10 is an enlarged view showing the enlarged view of section “B” of FIG. 9.

[0072] Referring to FIGS. 1 to 10, a battery pack (1000) according to one embodiment of the present invention comprises: a battery assembly (100) comprising a plurality of battery cells (110) each including a venting portion (110a); a pack frame (1100) in which the battery assembly (100) is housed; a plate (130) facing the venting portion (110a) of the battery cells (110); a cooling material circulating inside the battery assembly (100) while in direct contact with the battery cells (110); and a waterproof adhesive (150) separating the venting portion (110a) of the battery cell (110) from the cooling material. A venting channel (140) is formed in at least one of the places inside the pack frame (1100) or between the plate (130) and the pack frame (1100) to guide the venting gas discharged from the venting portion (110a).

[0073] The battery pack (1000) according to the present embodiment may include a plurality of battery cells (110). The battery cell (110) according to the present embodiment may be of various types, for example, a pouch-type battery cell, a prismatic battery cell, or a cylindrical battery cell. For example, as shown in FIGS. 6 to 8, the battery cell (110) according to the present embodiment may be a cylindrical battery cell. Although the following description focuses on a cylindrical battery cell, the battery cell according to the present embodiment is not limited thereto, and various types of battery cells may be applied.

[0074] The venting section (110a) of the battery cell (110) according to the present embodiment may be located at the top or bottom of the battery cell (110). The venting section (110a) can discharge the excess pressure to the outside when excessive pressure occurs within the battery cell (110). The venting section (110a) may open when the pressure exceeds a certain level, and may not open when the internal pressure is within a normal range. The venting section (110a) may include a sealing material to seal the battery so that gas does not leak out under normal conditions. When the internal pressure of the battery cell (110) increases, the sealing material may be destroyed or deformed, allowing gas to be discharged. The venting section (110a) may include a filter to filter out particles that come out along with the discharged gas. The filter may perform the function of preventing harmful substances from being discharged to the outside.

[0075] Specifically, if a thermal event or thermal runaway occurs inside the battery cell (110), high-temperature venting gas or particles may be discharged through the open venting section (110a). Generally, when gas is ejected from the battery cell (110), pieces of electrode plates or active materials inside the battery cell (110) may be discharged to the outside while heated to a high temperature, and these high-temperature particles may appear in the form of sparks. The high-temperature venting gas or particles discharged through the venting section (110a) may be discharged to the outside through a separate venting channel (140) provided in the battery pack (1000).

[0076] The venting section (110a) of the battery cell (110) can ensure safety by relieving excessive pressure inside the battery cell (110). When the pressure inside the battery cell (110) rises above a certain level, the pressure can be discharged to the outside through the venting section (110a) to reduce the risk of explosion and rupture. In addition, when the temperature inside the battery cell (110) rises above a certain level, the venting section (110a) can discharge heat from inside the battery cell (110) to maintain the temperature of the battery cell (110) at an appropriate level. Through this, the performance and lifespan of the battery cell (110) can be improved.

[0077] The plate (130) according to the present embodiment may be positioned facing the venting portion (110a) of the battery cells (110). The plate (130) may be designed to effectively disperse and guide the gas discharged from the venting portion (110a) of the battery cells (110). The plate (130) discharges the gas and particles discharged through the venting portion (110a) of the battery cells (110) to the outside, thereby preventing the accumulation of gas and particles inside the battery pack (1000). This minimizes dangerous situations such as explosions or fires in the battery pack (1000). Additionally, the plate (130) can release heat generated in the battery cells (110) to the venting channel (140). This lowers the temperature of the battery cells (110), thereby improving the lifespan of the battery cells (110) and ensuring the stability of the battery pack (1000).

[0078] The plate (130) may include a material having a predetermined strength. For example, aluminum, stainless steel, special alloys, etc. may be used. The plate (130) may be made of metal or plastic.

[0079] The plate (130) can guide the venting gas discharged from the venting section (110a) of the battery cell (110) to the venting channel (140). Through this, the gas or particles discharged from the venting section (110a) can be effectively discharged to the outside through the plate (130) and the venting channel (140).

[0080] The pack frame (1100) according to the present embodiment may be in a form that wraps around the lower surface (in the -z-axis direction of FIG. 4) of the battery assembly (100) while being partially open. The pack frame (1100) may be intended to protect the battery assembly (100) and the electrical components connected thereto from external physical impact. The pack frame (1100) may include a portion with high thermal conductivity to rapidly dissipate heat generated in the internal space to the outside. For example, at least a portion of the pack frame (1100) may be made of a metal with high thermal conductivity, such as aluminum, gold, silver, copper, platinum, or an alloy containing these, but is not limited thereto. Additionally, the pack frame (1100) may have partial electrical insulation, and an insulating film may be provided or an insulating coating may be applied at locations where insulation is required.

[0081] The pack frame (1100) may include a bottom portion (1110) on which the battery assembly (100) is placed and a side beam (1120) extending along the edge of the bottom portion (1110). This side beam (1120) may extend in a direction perpendicular to one side of the bottom portion (1110). By the bottom portion (1110) and the side beam (1120), an internal space with an open top is provided, and the battery assembly (100) can be housed in this internal space.

[0082] For example, the side beam (1120) may include a first side beam (1121), a second side beam (1122), a third side beam (1123), and a fourth side beam (1124). The first side beam (1121), the second side beam (1122), the third side beam (1123), and the fourth side beam (1124) may be connected along the edge of the bottom portion (1110) and may extend in a direction perpendicular to one side of the bottom portion (1110). By the bottom portion (1110), the first side beam (1121), the second side beam (1122), the third side beam (1123), and the fourth side beam (1124), an internal space with one side open is provided, and a battery assembly (100) may be housed in this internal space.

[0083] Meanwhile, the pack frame (1100) may include cross beams (1131, 1132, 1133) that partition the internal space. Some of the cross beams (1131, 1132, 1133) may partition the space where the battery assembly (100) is located. For example, the first cross beam (1131) and the second cross beam (1132) may be located on the bottom portion (1110). The first cross beam (1131) and the second cross beam (1132) may divide the internal space into three spaces where three battery assemblies (100) are located. Meanwhile, other parts of the cross beams (1131, 1132, 1133) can separate the space where the battery assembly (100) is located from the electronic component space where the BDU (Battery Disconnect Unit) module (1500) and BMS (Battery Management System) module (1600) are located. For example, the third cross beam (1133) can partition the space where the battery assembly (100) is located from the electronic component space where the BDU module (1500) and BMS module (1600) are located. The BDU module (1500) and BMS module (1600) will be described later.

[0084] The pack cover (1200) according to the present embodiment can cover the open upper portion of the pack frame (1100). Additionally, the pack cover (1200) can cover the upper surface of the battery assembly (100) mounted on the pack frame (1100).

[0085] A battery assembly (100) according to the present embodiment may include battery cells (110) and a cell frame (120) covering at least a portion of the battery cells (110). A cooling material that is in direct contact with the battery cells (110) and circulates inside the battery assembly (100) may flow along the internal space of the cell frame (120).

[0086] As an example structure, a cell frame (120) according to one embodiment of the present invention may include a top cell frame (120a), a middle cell frame (120b), and a bottom cell frame (120c). Battery cells (110) may be inserted into holes provided in the top cell frame (120a), the middle cell frame (120b), and the bottom cell frame (120c) and stored in the cell frame (120). The bottom cell frame (120c) may be located at the bottom, the top cell frame (120a) may be located at the top, and the middle cell frame (120b) may be located between the top cell frame (120a) and the bottom cell frame (120c).

[0087] In the cell frame (120), a cell frame hole (120h) into which battery cells (110) are inserted may be formed. The cell frame hole (120h) may include a top cell frame hole (120ah) formed in the top cell frame (120a) and a middle cell frame hole (120bh) formed in the middle cell frame (120b).

[0088] The top cell frame (120a) may be partially open while covering the upper surface of the battery cells (110). Specifically, the top cell frame (120a) may be open to correspond to the shape of each battery cell (110). The upper portions of the battery cells (110) may be partially fitted into the top cell frame holes (120ah) inside the top cell frame (120a). The circumference of the top cell frame holes (120ah) that form part of the top cell frame (120a) may correspond to the circumference of the battery cells (110).

[0089] The middle cell frame (120b) may be open on both sides while covering a portion of the sides of the battery cells (110). Specifically, the middle cell frame (120b) may be open to correspond to the shape of each battery cell (110). The middle portions of the battery cells (110) may be partially fitted into the middle cell frame holes (120bh) inside the middle cell frame (120b). The perimeter of the middle cell frame holes (120bh) forming part of the middle cell frame (120b) may correspond to the perimeter of the battery cell (110).

[0090] The bottom cell frame (120c) may be located on one side of the plate (130). At least a portion of the bottom cell frame (120c) may be located below the battery cells (110). The bottom cell frame (120c) may be located below the battery cells (110) while covering the lower surface of the battery cells (110) (in the -z-axis direction of FIG. 5). The bottom cell frame (120c) may be provided with a bottom cell frame hole that guides the discharge of venting gas. The bottom cell frame hole will be described later.

[0091] The top cell frame (120a), middle cell frame (120b), and bottom cell frame (120c) may be a structure that is combined with each other while housing the battery cells (110). The top cell frame (120a), middle cell frame (120b), and bottom cell frame (120c) can physically protect the battery cells (110).

[0092] The cooling material according to the present embodiment can cool the battery cells (110), other electrical components, and busbars (160) that generate heat within the battery assembly (100) by flowing inside the cell frame (120) and receiving heat through contact. That is, the cooling material can cool the battery cells (110) by coming into direct contact with the battery cells (110). Therefore, compared to cooling the battery pack (1000) indirectly using a heat sink, etc. as in the conventional method, the cooling efficiency can be improved, and the lifespan of the battery can be extended.

[0093] The battery cells (110) inside the cell frame (120) can be mounted in the battery pack (1000) while immersed in a cooling material. The cooling material according to the present embodiment can come into direct contact with at least some of the battery cells (110) inside the cell frame (120).

[0094] The cooling material can directly cool the battery cell (110), other electrical components, and busbar (160) that generate heat within the battery assembly (100) by receiving heat through direct contact. Therefore, as described above, compared to cooling the battery pack indirectly using a heat sink or the like as in the conventional method, the cooling efficiency can be improved, and the lifespan of the battery cell (110) can be extended.

[0095] The cooling material according to the present embodiment comes into direct contact with the battery cell (110) within the cell frame (120). The cooling material is a cooling medium that cools 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 liquid cooling medium may be applied to the cooling material without restriction. Additionally, bubbles, paraffin, or phase change materials (PCM) may be applied to the cooling material. For example, the cooling material may be a liquid. For example, the cooling material may be cooling oil or cooling water. However, since the cooling material comes into direct contact with the battery cell (110), other electrical components, and terminal assembly, etc., within the battery assembly (100), it needs to be electrically insulated. Therefore, the cooling material may be a material having insulating properties, and 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 restriction.

[0096] A battery pack (1000) according to one embodiment of the present invention may include a waterproof adhesive (150) for stably fixing battery cells (110) within a cell frame (120) and preventing cooling material from being discharged into the cell frame (120). The waterproof adhesive (150) can stably fix the battery cells (110) within the cell frame (120). The waterproof adhesive (150) can cover a venting portion (110a) of a battery cell (110). The venting portion (110a) may correspond to a member or mechanism provided in the battery cell (110) to discharge venting gas, etc., inside the battery cell (110). The waterproof adhesive (150) can cover a portion of the side of the battery cell (110) adjacent to the bottom surface of the battery cell (110).

[0097] The venting path and cooling material of the battery cell (110) can be separated from each other by a waterproof adhesive (150). Insulating oil may be applied to the cooling material. Since insulating oil is an oil component, it can cause additional thermal runaway, ignition, and explosion when it comes into contact with venting gas or particles. The waterproof adhesive (150) can cover the venting section (110a) so that the venting section (110a) is not exposed to the cooling material. The waterproof adhesive (150) blocks high-temperature venting gas and particles discharged from the venting section (110a) of the battery cell (110) from coming into contact with the cooling material, thereby preventing thermal runaway of the battery cell (110) from leading to ignition or explosion of the entire battery assembly (100).

[0098] The waterproof adhesive (150) can be applied uniformly across the bottom and a portion of the side of the battery cell (110), including the venting portion (110a). For example, the waterproof adhesive (150) can be applied to completely cover the venting portion (110a) of the battery cell (110), thereby preventing the gas discharged through the venting portion (110a) from coming into direct contact with the cooling material. After the adhesive is applied, a drying and curing process can be carried out to form a solid waterproof membrane. This waterproof membrane can maintain structural stability even in high temperature and high pressure environments. In other words, the waterproof adhesive (150) prevents the cooling material from undergoing a chemical reaction or ignition due to the high temperature of the gas by preventing the gas or particles discharged from the venting portion (110a) from coming into contact with the cooling material. In particular, if an oil-based cooling material, such as insulating oil, comes into contact with the venting gas, it can lead to a fire or explosion, but the waterproof adhesive (150) can fundamentally block such risks. Additionally, the waterproof adhesive (150) can prevent external moisture or contaminants from penetrating into the battery cell (110) through the venting section (110a). This can prevent performance degradation and shortening of the lifespan of the battery cell (110) and can maintain the long-term stability of the battery pack (1000).

[0099] The waterproof adhesive (150) can be designed to wrap at least a portion of the outer perimeter of the battery cell (110) to match the shape of the battery cell (110). For example, if the battery cell (110) is a cylindrical battery cell, the waterproof adhesive (150) can wrap around the perimeter of the cylindrical battery cell in a circular shape. Also, if the battery cell (110) is a prismatic battery cell, the waterproof adhesive (150) can wrap around the perimeter of the prismatic battery cell in a square shape. The waterproof adhesive (150) can be applied to the outer perimeter of the battery cell (110) with a uniform thickness. Through this, a stable sealing effect can be maintained, and the structural stability of the waterproof adhesive (150) can be ensured, especially under high temperature and high pressure conditions. The waterproof adhesive (150) can be applied primarily to the contact surface between the venting portion (110a) of the battery cell (110) and the cell frame (120), in which case the waterproof adhesive (150) can cover all or part of the venting portion (110a). Additionally, the waterproof adhesive (150) can be applied to the area of ​​the inner surface of the cell frame (120) that is in contact with the battery cell (110), thereby blocking the diffusion of gas vented from the battery cell (110) into the cell frame (120). The waterproof adhesive (150) can be applied with a uniform thickness using automated application equipment and can maintain a stable sealing effect even after the curing process is completed. The waterproof adhesive (150) can contribute to maintaining the long-term performance and extending the lifespan of the battery cell (110) by blocking the penetration of moisture and contaminants. Furthermore, the overall durability of the battery pack (1000) can be improved through the physical protection function of the battery cell (110).

[0100] The waterproof adhesive (150) may include silicone-based, urethane-based, or epoxy-based resins. These materials are not damaged by high-temperature gases and particles emitted from the venting section (110a) and can maintain sealing performance even under long-term thermal and chemical stress. The venting channel (140) according to the present embodiment can serve to guide gases or particles emitted from the venting section (110a) of the battery cell (110) to the outside. The venting channel (140) may include a durable material capable of withstanding the high temperature and chemical properties of the emitted gases or particles. The venting channel (140) can effectively collect gases or particles emitted from the venting section (110a) and safely discharge them to the outside of the battery pack (1000). Through this, other components within the battery pack (1000) can be prevented from being damaged by the emitted gases or particles.

[0101] The waterproof adhesive (150) may be positioned above the bottom cell frame (120c) or the plate (130). The waterproof adhesive (150) may be applied to the bottom cell frame (120c) or the plate (130). The waterproof adhesive (150) applied to the bottom cell frame (120c) or the plate (130) can stably fix the battery cells (110) on the bottom cell frame (120c) or the plate (130) while covering the venting portion (110a) of the battery cell (110). As will be described later, the waterproof adhesive (150) applied to the bottom cell frame (120c) or the plate (130) may correspond to a third waterproof adhesive (150c).

[0102] FIG. 11 is a partial perspective view of the battery pack (1000) of FIG. 1 with the pack cover (1200) removed, viewed from a different angle. FIG. 12 is an enlarged view showing the enlarged view of section “C” of FIG. 9. FIG. 13 is a partial cross-sectional perspective view showing the view cut along the cutting line A-A' of FIG. 2. FIG. 14 is a partial cross-sectional view showing a part of the view cut along the cutting line A-A' of FIG. 2. FIG. 15 is a plan view showing a bottom cell frame (120c) according to an embodiment of the present invention. Specifically, FIG. 15 is a plan view showing the bottom cell frame (120c) illustrated in FIG. 6 viewed from below upward along the +z-axis direction of FIG. 6. FIG. 16 is an enlarged view showing the enlarged view of section “D” of FIG. 15. FIG. 17 is an exploded perspective view of battery cells, a waterproof adhesive, a plate, and bottom cell frames according to embodiments of the present invention. FIG. 18 is a perspective view showing the assembled state of the battery cells, waterproof adhesive, plate, and bottom cell frame according to FIG. 17.

[0103] Referring to FIGS. 4, 6, 9 through 18, as described above, a venting channel (140) is formed in at least one of the spaces between the plate (130) and the pack frame (1100) to guide the venting gas (VG) discharged from the venting section (110a). For example, the venting channel (140) according to the present embodiment may be positioned at the bottom of the battery cells (110). The venting gas (VG) discharged from the venting section (110a) may travel along the venting channel (140) and then be discharged to the outside of the battery pack (1000) through a venting device (1400) provided in the pack frame (1100).

[0104] By positioning the venting channel (140) at the bottom of the battery cells (110), the gas and particles generated inside the battery cells (110) naturally move downward under the influence of gravity, allowing the gas and particles to be easily discharged. Additionally, since the gas and particles gather at the bottom of the battery cells (110) and are discharged to the outside through the venting channel (140), the pressure rise inside the battery pack (1000) can be effectively suppressed, and the risk of explosion or fire can be minimized. By positioning the venting channel (140) at the bottom, the upper space of the battery cells (110) can be utilized to the maximum extent, thereby increasing the energy density of the battery pack (1000).

[0105] The venting channel (140) according to the present embodiment may be located between the plate (130) and the pack frame (1100). By having the venting channel (140) located between the plate (130) and the pack frame (1100), the internal space of the battery pack (1000) can be optimized to accommodate more battery cells (110) or to install additional cooling and safety devices. That is, by providing the venting channel (140) between the plate (130) and the pack frame (1100) and filling the remaining space with battery cells (110), space efficiency can be increased and the energy density of the battery pack (1000) can be increased. The venting channel (140) may be provided between the plate (130) and the bottom portion (1110) of the pack frame (1100).

[0106] The plate (130) according to the present embodiment may be a plate-shaped member without any open portions, and the bottom cell frame (120c) may be a member with a partially open shape in which bottom cell frame holes (120ch) are formed. Each of the battery cells (110) may correspond to each of the bottom cell frame holes (120ch). Each of the battery cells (110) may correspond one-to-one with each of the bottom cell frame holes (120ch). Additionally, the bottom cell frame holes (120ch) may be provided to correspond to the venting portions (110a) of the battery cells (110).

[0107] The plate (130) may be located on one side of the bottom cell frame (120c). The plate (130) may be located on one side of the bottom cell frame (120c) and may cover the bottom cell frame holes (120ch). The plate (130) may be located on the upper or lower part of the bottom cell frame (120c). Although FIGS. 12 and 14 show the plate (130) placed on the upper part of the bottom cell frame (120c), as another embodiment of the present invention, the plate (130) placed on the lower part of the bottom cell frame (120c) may also be within the scope of the present invention.

[0108] High-temperature venting gas (VG) discharged through the venting portion (110a) of the battery cell (110) can pass through the bottom cell frame hole (120ch) of the bottom cell frame (120c) after tearing or melting a part of the plate (130), and then move to the venting channel (140) between the plate (130) and the bottom portion (1110) of the pack frame (1100). The venting gas (VG) flowing along the venting channel (140) can be discharged to the outside of the battery pack (1000) through the venting device (1400) provided in the pack frame (1100) as described above.

[0109] Since the venting gas (VG) passes through the bottom cell frame hole (120ch) while breaking the portion of the plate (130) facing the venting portion (110a) of the battery cells (110), there is no particular restriction on the position between the plate (130) and the bottom cell frame (120c). Even if the plate (130) is located above or below the bottom cell frame (120c), any form in which the venting gas (VG) passes through the bottom cell frame hole (120ch) while tearing or melting a portion of the plate (130) can be implemented.

[0110] The bottom cell frame (120c) and the plate (130) may be composed of separate structures separated from each other. In the prior art, the bottom frame itself is formed thickly, or the structure for venting and sealing is manufactured as a single unit, making it difficult to simultaneously achieve a sealing structure to prevent leakage of cooling material and an easy-to-break structure to guide venting gas during venting. However, in this embodiment, a bottom cell frame hole (120ch) may be formed in the bottom cell frame (120c) to have a partially open structure, and a separate plate (130) covering the bottom cell frame hole (120ch) may be placed on one side of the bottom cell frame (120c). The plate (130) is positioned facing the venting portion (110a) of the battery cells (110) and can provide a structure that prevents leakage of cooling material together with a waterproof adhesive (150) while allowing it to rupture during venting.

[0111] The advantage of this separated structure is that the plate (130) can be made sufficiently thin. In other words, the plate (130) is sufficiently thin so that it can be easily torn during venting, allowing gas and flames to be effectively discharged. For example, the plate (130) can have a thin thickness of 0.5 mm or more and 2.0 mm or less. At the same time, the bottom cell frame (120c) does not need to be made excessively thin for venting performance, so structural rigidity can be maintained, and it can be advantageous in terms of weight and space efficiency of the entire battery pack (1000). That is, by the structure of the separate plate (130) separated from the bottom cell frame (120c), conflicting requirements of a sealing structure to prevent leakage of cooling material and a breaking structure that is easy during venting can be achieved simultaneously, and structural rigidity can also be secured through the bottom cell frame (120c).

[0112] Meanwhile, the bottom cell frame (120c) may include a protruding rib (120r), and a space between the bottom cell frame (120c) and the bottom portion (1110) is created by this rib (120r), and this space can be utilized as a venting channel (140). However, this is an exemplary structure, and there are no special restrictions on the location or shape of the venting space (VS) provided within the battery pack (1000).

[0113] Meanwhile, the venting channel (140) according to the present embodiment may be connected to a venting device (1400) provided in the pack frame (1100). Gas and particles generated inside the battery cell (110) may be guided to the venting device (1400) through the venting channel (140). Gas or heat inside the pack frame (1100) may be discharged to the outside through the venting device (1400). The venting device (1400) may include components such as a gas outlet, a pressure regulator, and a filter, and may automatically discharge gas when the internal pressure exceeds a certain level. The venting device (1400) may detect the internal pressure and, when it exceeds a set threshold, automatically discharge gas to the outside to regulate the internal pressure. As a result, safety inside the pack frame (1100) is ensured, and damage to the electronic device or battery pack (1000) can be prevented. In addition, it is possible to prevent accidents caused by excessive gas accumulation inside the pack frame (1100).

[0114] FIGS. 11 to 13 show an exemplary structure for the process in which a venting gas (VG) flowing along a venting channel (140) is finally discharged to the outside of a battery pack (1000). A venting device (1400) may be provided in the pack frame (1100). At least one venting device (1400) may be provided in the third side beam (1123). The venting gas (VG) flowing along the venting channel (140) between the plate (130) and the bottom portion (1110) of the pack frame (1100) may move to the electronic component space where the BDU module (1500) and BMS module (1600) are located through the gap under the third cross beam (1133), and may finally be discharged to the outside through the venting device (1400). However, this is one example of a directional venting structure that allows the venting gas (VG) to be discharged in an intended direction through a pre-designed venting channel (140), and other types of directional venting structures capable of inducing the movement of the venting gas (VG) may be applied as other examples of the present invention.

[0115] Referring again to FIGS. 4, FIGS. 6, FIGS. 9 through 18, the waterproof adhesive (150) can cover at least a portion of one side of the battery cell (110) where the venting portion (110a) is located. The waterproof adhesive (150) applied to the bottom cell frame (120c) or plate (130) to cover at least a portion of one side where the venting portion (110a) is located may correspond to the third waterproof adhesive (150c).

[0116] The waterproof adhesive (150) may be applied to cover at least a portion of the area around the venting portion (110a), including the upper or lower surface of the battery cell (110) where the venting portion (110a) is located. Specifically, the waterproof adhesive (150) may be applied within a diameter of approximately 5 mm to 20 mm based on the outer circumference of the venting portion (110a), and may be applied to completely cover the venting portion (110a) or extend to a portion of the battery cell (110) adjacent to the venting portion. This arrangement can reduce the possibility of the cooling material reacting chemically with the high-temperature gas or igniting by blocking the gas or particles discharged from the venting portion (110a) from coming into contact with the cooling material. Additionally, it can also serve to mitigate sudden pressure changes that may occur when gas is discharged inside the battery pack (1000).

[0117] The waterproof adhesive (150) can prevent moisture or contaminants from the outside from penetrating into the battery cell (110). This can protect the electrochemical reaction inside the battery cell (110) and contribute to preventing performance degradation and shortening of the lifespan of the battery cell (110).

[0118] The waterproof adhesive (150) can cover a portion of the side of the battery cell (110). The waterproof adhesive (150) is applied to the area adjacent to the venting portion (110a) on the side of the battery cell (110) to block high-temperature gas and particles that may be generated when gas is discharged through the venting portion from coming into direct contact with the internal components of the battery pack (1000). Specifically, the waterproof adhesive (150) extends from the bottom to the top of the battery cell (110) and can be applied within a range of about 30% to 70% of the side of the battery cell (110). In addition to this coverage area, other optimized coverage areas may be applied to minimize the possibility of contact with cooling materials during gas discharge without impairing the thermal management efficiency inside the battery pack (1000).

[0119] The thickness of the waterproof adhesive (150) may be 1 mm or more and 6 mm or less. The reason the thickness of the waterproof adhesive (150) is set to 1 mm or more is to prevent high-temperature gas and particles generated in the venting section (110a) from passing through the adhesive layer and coming into contact with the cooling material. If the thickness of the waterproof adhesive (150) is less than 1 mm, there is a risk that the high-temperature gas discharged through the venting section (110a) may come into contact with the cooling material and cause additional fire or explosion. Therefore, sufficient sealing performance can be secured by setting the thickness of the waterproof adhesive (150) to 1 mm or more. Conversely, the reason the thickness of the waterproof adhesive (150) is set to 6 mm or less is that if the adhesive becomes excessively thick, heat cannot be effectively released from the surface of the battery cell (110), and thus cooling performance may be reduced. In particular, if applied with a thickness exceeding 6 mm, the waterproof adhesive (150) may block the cooling path of the battery cell (110), thereby limiting the area where the cooling material can sufficiently contact the battery cell (110), which may have a negative effect on thermal management. Therefore, by setting it to 6 mm or less, sealing performance can be secured while maintaining appropriate cooling performance.

[0120] For example, when the waterproof adhesive (150) is applied with a thickness of 2.5 mm, it is suitable for a lightweight battery pack (1000) and effectively blocks gas discharged through the venting section (110a). Conversely, when the waterproof adhesive (150) is applied with a thickness of 5.5 mm, it can provide enhanced sealing performance in a medium-to-large battery pack (1000) while maintaining sufficient cooling performance. The waterproof adhesive (150) can be applied with a uniform thickness around the venting section (110a) of the battery cell (110) and can be applied precisely within a range of 1 mm to 6 mm using automated application equipment.

[0121] In conclusion, by setting the thickness of the waterproof adhesive (150) to between 1 mm and 6 mm, it is possible to block high-temperature gases and particles generated in the venting section (110a) from coming into contact with the cooling material. This reduces the risk of chain ignition throughout the battery pack (1000) in the event of thermal runaway and prevents additional fires that may occur inside the battery pack (1000). Additionally, by setting the thickness of the waterproof adhesive (150) so as not to exceed 6 mm, the heat inside the battery pack (1000) can be effectively managed without obstructing the cooling path of the battery cell (110). This can contribute to preventing performance degradation of the battery pack (1000) and optimizing the heat transfer efficiency with the cooling system. The waterproof adhesive (150) with optimized thickness can block the penetration of moisture and contaminants from the outside, thereby preventing performance degradation of the battery cell (110) and increasing durability. Through this, it is possible to extend the lifespan of the battery cell (110) and ensure long-term reliability of the battery pack (1000).

[0122] As one exemplary structure of the present invention, the thickness of the waterproof adhesive (150) in the area corresponding to the venting portion (110a) may be thinner than the thickness of the waterproof adhesive (150) in the area in contact with the side of the battery cell (110). For example, the waterproof adhesive (150) may have a relatively thin thickness of 1 mm or more and 3 mm or less in the area corresponding to the venting portion (110a), and may have a relatively thick thickness of 4 mm or more and 6 mm or less in the area in contact with the side of the battery cell (110). The area corresponding to the venting portion (110a) may correspond to the area between the battery cell (110) and the plate (130) below the battery cell (110), and the area in contact with the side of the battery cell (110) may correspond to the area between the sides of the battery cells (110).

[0123] By setting the waterproof adhesive (150) in the area corresponding to the venting section (110a) to be relatively thin, the waterproof adhesive (150) can be easily perforated by the pressure of the venting gas (VG) during venting, thereby securing a gas discharge path. On the other hand, the waterproof adhesive (150) in the area in contact with the side of the battery cell (110) can provide a secure sealing structure so that the cooling material is not swept away by the venting gas (VG) as it moves through the venting channel (140) and leaks into the venting channel (140).

[0124] In one embodiment, the waterproof adhesive (150) may not be applied to the central region of the venting portion (110a) or may be applied minimally, and may be applied such that the thickness gradually increases from the outer region of the venting portion (110a) toward the side of the battery cell (110). This differentiated thickness structure can ensure a secure sealing structure for the cooling material during normal operation, while enabling rapid gas discharge in the event of thermal runaway.

[0125] Waterproof adhesive (150) of different thicknesses in each section can be implemented through a step-by-step application process or a masking technique. By forming the area corresponding to the venting section (110a) relatively thinly, high-pressure gas can preferentially break that area during venting, allowing for rapid gas discharge. At the same time, by applying the side area sufficiently thickly, reliable sealing performance can be ensured so that the cooling material does not leak out during normal operation. In other words, the conflicting requirements of ease of venting and sealing performance can be simultaneously satisfied in a single layer of waterproof adhesive (150).

[0126] A waterproof adhesive (150) may be applied to the surface facing the venting portion (110a) of the battery cells (110) among the plates (130) according to the present embodiment.

[0127] Venting gas (VG) can be discharged through the venting portion (110a) of the battery cell (110), but moisture or water may penetrate into the battery cell (110) during the gas discharge process. Such moisture penetration may cause performance degradation and shorten the lifespan of the battery cell (110).

[0128] The waterproof adhesive (150) can serve to prevent moisture or water from penetrating into the battery cell (110). The waterproof adhesive (150) can be applied to the facing surface of the plate (130) and can completely cover the venting section (110a). This blocks the path through which moisture or water can penetrate when gas is discharged through the venting section (110a). Thus, the performance of the battery cell (110) can be maintained and its lifespan extended. Additionally, the waterproof adhesive (150) can optimize the gas discharge path by strengthening the adhesion between the plate (130) and the battery cell (110).

[0129] A cell frame (120) according to one embodiment of the present invention may include a side wall that contacts a battery cell (110). The side wall serves to fix the battery cell (110) within the cell frame (120) and can help to stably place the battery cell (110) in the cell frame (120) by accurately guiding the position of the battery cell (110) during assembly.

[0130] Specifically, the side wall can come into contact with the side of the battery cell (110), thereby allowing the position of the battery cell (110) to be accurately maintained during the assembly process. Additionally, the side wall extends along the height direction of the battery cell (110) and can serve as a guide to naturally guide the position of the battery cell (110) when it is inserted into the cell frame (120). This side wall helps to fix the battery cell (110) in an accurate position, thereby improving the precision and efficiency of the assembly.

[0131] Furthermore, the above-mentioned side wall can fix the battery cell (110) so that even after the battery cell (110) is assembled, the battery cell (110) does not move due to external shock or vibration within the cell frame (120). Through this, the battery cell (110) can be protected from external physical shock, and the rigidity of the entire cell frame (120) can be improved, thereby serving to increase the durability and safety of the battery pack (1000).

[0132] The above side wall may be provided in the form of a plurality of ribs on the inner side of the cell frame (120). The above side wall is formed around the perimeter of the cell frame hole (120h) in which the battery cell (110) is housed, and may come into contact with the side of the battery cell (110).

[0133] The above side wall may be formed of a material having a certain elasticity so as to function to absorb shock at the contact portion with the battery cell (110). For example, a metal or high-strength plastic material may be used, thereby protecting the battery cell (110) while simultaneously achieving weight reduction of the cell frame (120).

[0134] The waterproof adhesive (150) can maintain a seal between the battery cell (110) and the cell frame (120) to prevent moisture or external substances from penetrating into the battery cell (110). The waterproof adhesive (150) may be any one of silicone-based resin, urethane-based resin, or epoxy-based resin, but is not limited thereto.

[0135] Referring again to FIGS. 5 and 6, the cell frame (120) according to the present embodiment may be positioned to cover the upper surface, lower surface, and part of the side of the battery cells (110). The cell frame (120) may serve to fix the battery cells (110). That is, the cell frame (120) may be intended to protect the battery cells (110) and the electrical components connected thereto from external physical impact. The cell frame (120) may include a plurality of cell frame holes (120h) inside to safely position the battery cells (110). Each cell frame hole (120h) may be designed to fit the shape of the battery cells (110) to provide stable support.

[0136] The cell frame (120) has a portion open so that the electrodes of the stored multiple battery cells (110) can be exposed to the outside, and a bus bar (160) may be positioned around the open area. The battery cells (110) can be fitted and stored in the cell frame holes (120h) provided in the cell frame (120). The cell frame (120) can be provided in various shapes and materials so that each of the multiple battery cells (110) can be fitted. The cell frame (120) may use a metal material to maintain a certain rigidity, but is not limited thereto. For example, the cell frame (120) can be provided by injection molding.

[0137]

[0138] FIG. 19 is a cross-sectional view showing a section cut along the cutting line H-H' of FIG. 18. FIG. 20 is a partial cross-sectional view showing an enlarged view of section “I” of FIG. 19.

[0139] Referring to FIG. 8 and FIG. 14 to FIG. 20 together, the diameter (d1) of the bottom cell frame hole (120ch) may be larger than the diameter (d3) of the venting part (110a) and smaller than the diameter (d2) of the battery cell (110). For example, if the diameter (d2) of the battery cell (110) is approximately 46 mm, the diameter (d1) of the bottom cell frame hole (120ch) may be set to be 38 mm or more and 40 mm or less, and the diameter (d3) of the venting part (110a) may be approximately 36 mm. However, the above figures are merely examples, and the bottom cell frame hole (120ch), the battery cell (110), and the venting part (110a) are not limited to the above values.

[0140] By setting the diameter (d1) of the bottom cell frame hole (120ch) to be larger than the diameter (d3) of the venting portion (110a) and smaller than the diameter (d2) of the battery cell (110), the rim portion at the bottom of the battery cell (110) can be supported by the bottom cell frame (120c), while the venting portion (110a) area can be completely located within the bottom cell frame hole (120ch). Through this, the battery cell (110) can be stably supported, and a sufficient path for the venting gas (VG) to travel can be secured.

[0141] Since the diameter (d1) of the bottom cell frame hole (120ch) is larger than the diameter (d3) of the venting section (110a), when the venting gas (VG) is discharged from the venting section (110a), the venting gas (VG) and the particles contained therein can pass smoothly through the bottom cell frame hole (120ch). All of the venting gas (VG) and the particles contained therein can pass through the bottom cell frame hole (120ch) without any of the venting gas (VG) and the particles contained therein leaking out to a part other than the bottom cell frame hole (120ch). Accordingly, the venting gas (VG) and the particles contained therein can pass through the bottom cell frame hole (120ch) and be easily guided to the venting channel (140).

[0142] Additionally, since the diameter (d1) of the bottom cell frame hole (120ch) is smaller than the diameter (d2) of the battery cell (110), the battery cell (110) can be stably supported by the bottom cell frame (120c). Also, since the diameter (d1) of the bottom cell frame hole (120ch) is smaller than the diameter (d2) of the battery cell (110), even if the plate (130) is broken by the venting gas (VG) discharged from the venting part (110a), the battery cell (110) can be prevented from escaping through the bottom cell frame hole (120ch).

[0143] Due to the above relationship, the lower edge portion of the battery cell (110) is stably supported by the bottom cell frame (120c), while a sufficient venting path can be secured.

[0144] FIG. 21 is a plan view showing a plate (130) according to an embodiment of the present invention. Specifically, FIG. 21 is a plan view showing the plate (130) shown in FIG. 6 as viewed from the -z-axis direction of FIG. 6. FIG. 22 is a cross-sectional view showing the plate cut along the cutting line E-E' of FIG. 21.

[0145] Referring to FIGS. 6, FIGS. 10, FIGS. 14, FIGS. 21, and FIGS. 22, the plate (130) according to the present embodiment may have a thickness (T) of 0.5 mm or more and 1.0 mm or less. Additionally, the plate (130) may include a metal material.

[0146] Through this thickness (T) range, the plate (130) can maintain lightness while having sufficient strength and heat resistance. By setting the thickness (T) to 0.5 mm or more, the plate (130) can secure sufficient strength to withstand external impact or pressure. In addition, by setting the thickness (T) to 1.0 mm or less to maintain the lightness of the plate (130), the total weight of the battery pack (1000) can be reduced.

[0147] Unlike conventional integrated thick bottom frames, the thin plate (130) structure configured separately from the bottom cell frame (120c) allows flames and gases to be rapidly discharged during venting. Since the plate (130) is separated as a separate component, the bottom cell frame (120c) can have sufficient thickness to ensure structural rigidity, and the plate (130) can have a thin thickness optimized for venting performance. This separated structure of the bottom cell frame (120c) and the plate (130) can simultaneously satisfy the conflicting requirements of sealing the cooling material and discharging the venting gas.

[0148] Through this thickness (T) range, the strength and heat resistance of the plate (130) are secured, thereby effectively treating the gas and particles emitted from the venting portion (110a) of the battery cell (110) and increasing the safety of the battery pack (1000). In addition, the heat generated by the battery cell (110) can be effectively managed, and the performance of the battery pack (1000) can be optimized through connection with a cooling system.

[0149] The plate (130) may include various metal materials such as aluminum, steel, and titanium. These metals may be selected to suit specific uses according to their respective characteristics.

[0150] Referring again to FIGS. 6, FIGS. 10, FIGS. 14, FIGS. 21, and FIGS. 22, the plate (130) according to the present embodiment may be an injection-molded product with a thickness (T) of 1.0 mm or more and 2.0 mm or less.

[0151] Through this thickness (T) range, the plate (130) can maintain lightness while having sufficient strength and heat resistance. By setting the thickness (T) to 1.0 mm or more, the plate (130) can secure sufficient strength to withstand external impact or pressure. In addition, by setting the thickness (T) to 2.0 mm or less, the plate (130) can maintain lightness, thereby reducing the overall weight of the battery pack (1000).

[0152] Through this thickness (T) range, the strength and heat resistance of the plate (130) are secured, thereby effectively treating the gas and particles emitted from the venting portion (110a) of the battery cell (110) and increasing the safety of the battery pack (1000). In addition, the heat generated by the battery cell (110) can be effectively managed, and the performance of the battery pack (1000) can be optimized through connection with a cooling system.

[0153] Referring again to FIGS. 6, FIGS. 21, and FIGS. 22, a plate (130) according to another embodiment of the present invention may include a notching portion (130a) positioned to correspond to a venting portion (110a) and ruptured at a pressure above a certain level. Due to the rupture of the notching portion (130a), a part of the plate (130) may be broken when venting gas (VG) is discharged. When gas or particles are ejected from the venting portion (110a) and the pressure increases, and the notching portion (130a) ruptures at a pressure above a certain level, the gas or particles may pass through the broken part of the plate (130) and move to the venting channel (140). The gas or particles that have passed through the notching portion (130a) may be guided to the venting channel (140). Through this, the internal pressure can be rapidly lowered, and damage and explosion of the battery pack (1000) can be prevented.

[0154] The notching portion (130a) may be formed by locally reducing the thickness of the plate (130) or cutting it in a specific pattern. To quickly relieve excessive pressure inside the battery cell (110), the notching portion (130a) may be positioned in the center of the venting portion (110a) or at a location where gas discharge is required.

[0155] FIG. 23 is a plan view showing embodiments of the notching portion (130a) of the present invention.

[0156] Referring to FIG. 23, the notch part (130a) according to the present embodiment may have a circular or cross (十) or X shape. However, this is an exemplary shape of the notch part (130a), and the notch part in the present invention is not limited to this shape.

[0157] Depending on the shape of the venting part (110a), the efficiency of gas discharge and the safety of the battery cell (110) may vary. A specific shape may not be efficient in internal pressure dispersion during gas discharge, resulting in performance degradation or damage to the battery cell (110). As in this embodiment, by designing the shape of the notch part (130a) to be circular, cross-shaped, or X-shaped, the efficiency of gas discharge can be increased.

[0158] The circular notch part (130aa) allows the gas to be discharged uniformly, enabling efficient internal pressure dispersion. The cross-shaped notch part (130ab) can discharge the gas in four directions, allowing for rapid pressure relief. The X-shaped notch part (130ac) can provide uniform pressure dispersion by discharging the gas in the diagonal direction.

[0159] The notch part (130a) can minimize damage to the internal components of the battery cell (110) during the gas discharge process, preventing performance degradation of the battery cell (110).

[0160] Referring back to FIGS. 21 and 22, the thickness (t) of the notch part (130a) according to the present embodiment may be 0.25 mm or more and 0.5 mm or less.

[0161] Through this thickness (t) range, while the notch part (130a) stably supports the battery cell (110), in a situation where gas or particles are ejected from the venting part (110a) and the pressure is above a certain level, the notch part (130a) can rupture smoothly. That is, while improving the durability of the battery pack (1000), the gas and particles discharged from the venting part (110a) of the battery cell (110) can be effectively treated.

[0162] FIG. 24 is a plan view showing the battery assembly (100) of FIG. 5. FIG. 25 is a plan view showing the battery assembly (100) of FIG. 24 viewed from a different angle. FIG. 26 is a partial perspective view showing the battery assembly (100) of FIG. 5. FIG. 27 is a cross-sectional view showing a portion of the cross-section cut along the cutting line F-F' of FIG. 24. FIG. 28 is a partial cross-sectional view showing a portion of the cross-section cut along the cutting line G-G' of FIG. 24. FIG. 29 is a cross-sectional view showing a portion of the cross-section cut along the part of the battery assembly containing the connection hole.

[0163] Referring to FIGS. 24 to 29, the battery assembly (100) according to the present embodiment may include an inlet port (121) and an outlet port (122) for circulating a cooling material.

[0164] The cooling material can be introduced into the cell frame (120) through the inlet port (121) and then discharged outside the cell frame (120) through the outlet port (122).

[0165] The inlet port (121) may be positioned offset in the +x-axis direction from a virtual line passing through the center of the cell frame (120) while parallel to the y-axis of FIG. 24. The outlet port (122) may be positioned offset in the -x-axis direction from a virtual line passing through the center of the cell frame (120) while parallel to the y-axis of FIG. 24. The inlet port (121) and the outlet port (122) must be arranged in this way so that the cooling material can flow through the entire space inside the cell frame (120) and evenly cool all the battery cells (110). If the inlet port (121) and the outlet port (122) are located together in the center of the cell frame (120), the cooling material will only flow to the central part, which has the least flow resistance, and thus the cooling material will not flow well to the battery cells (110) located on the outer part of the cell frame (120). Ultimately, this results in a cooling imbalance in the battery assembly (100). Additionally, if the inlet port (121) and the outlet port (122) are positioned at an angle to one side of an imaginary line passing through the center of the cell frame (120) while being parallel to the y-axis of FIG. 24, a cooling imbalance occurs inside the battery assembly (100) because the cooling material will flow only to some of the outer cell cells (110) adjacent to the angled direction. Furthermore, unlike what is shown in FIG. 24, the inlet port (121) and the outlet port (122) may be positioned on opposite sides of the cell frame (120). When the inlet port (121) and the outlet port (122) are arranged in this way, the cooling material can be induced to flow evenly to all of the cell cells (110) inside the cell frame (120).

[0166] FIG. 30 is a cross-sectional view showing the entire cross section cut along the cutting line F-F' of FIG. 24, unlike FIG. 27.

[0167] Referring to FIGS. 5, FIGS. 6, and FIGS. 24 to 30, the battery assembly (100) according to the present embodiment may further include a cell frame (120) covering at least a portion of the battery cell (110). As described above, the cell frame (120) may include a top cell frame (120a), a middle cell frame (120b), and a bottom cell frame (120c).

[0168] The battery assembly (100) includes a plurality of cooling channels (300a, 300b) arranged along the longitudinal direction of the battery cell (110). The flow direction of the cooling material (CL) in any one of the plurality of cooling channels (300a, 300b) and the flow direction of the cooling material (CL) in another of the plurality of cooling channels (300a, 300b) may be opposite to each other. The longitudinal direction of the battery cell (110) refers to a direction parallel to the width direction of a relatively long portion of the battery cell (110), which may be a direction between the top and bottom of the battery cell (110), and terminals of the battery cell (110) may be provided at least at one of the top or bottom of the battery cell (110).

[0169] For example, a plurality of cooling channels (300a, 300b) may include a first cooling channel (300a) and a second cooling channel (300b). The first cooling channel (300a) and the second cooling channel (300b) may be arranged along the z-axis direction corresponding to the length direction of the battery cell (110). The first cooling channel (300a) may be located above the second cooling channel (300b) with respect to the z-axis direction, and the second cooling channel (300b) may be located below the first cooling channel (300a) with respect to the z-axis direction. Additionally, the cell frame (120) may include a connecting hole (123) connecting the plurality of cooling channels (300a, 300b).

[0170] Any one of the plurality of cooling channels (300a, 300b) may be connected to an inlet port (121), and the other of the plurality of cooling channels (300a, 300b) may be connected to an outlet port (122). For example, the second cooling channel (300b) may be connected to the inlet port (121), and the first cooling channel (300a) may be connected to the outlet port (122). Cooling material (CL) introduced into the inlet port (121) may flow along the second cooling channel (300b) and then move to the first cooling channel (300a) through the connection hole (123). Subsequently, the cooling material (CL) flowing along the first cooling channel (300a) may move to the outside of the battery assembly (100) through the outlet port (122).

[0171] A battery assembly (100) having multiple cooling channels (300a, 300b) can significantly reduce the cooling variation between battery cells (110). In the case of the battery cell (110) closest to the inlet port (121) and outlet port (122), the part of the battery cell (110) located in the second cooling channel (300b) comes into contact with the cooling material (CL) first, and the part of the battery cell (110) located in the first cooling channel (300a) comes into contact with the cooling material (CL) last. That is, in the case of the battery cell (110) closest to the inlet port (121) and outlet port (122), one part of the battery cell (110) comes into contact with the cooling material (CL) in the coldest state, and another part of the battery cell (110) comes into contact with the cooling material (CL) in the hottest state. On the other hand, in the case of the battery cell (110) located furthest from the inlet port (121) and outlet port (122) and closest to the connection hole (123), the part of the battery cell (110) located in the second cooling channel (300b) comes into contact with the cooling material (CL) relatively late, but the cooling material (CL) can pass through the connection hole (123) immediately and come into contact with the part of the battery cell (110) located in the first cooling channel (300a). That is, in the case of the battery cell (110) located closest to the connection hole (123), it can be interpreted that all parts of the battery cell (110) come into contact with the cooling material (CL) at an intermediate temperature.

[0172] When viewed from the perspective of a single battery cell (110), thermal equilibrium can be achieved through heat transfer between the part in contact with the first cooling channel (300a) and the part in contact with the second cooling channel (300b). Consequently, the battery cell (110) closest to the inlet port (121) and outlet port (122), and the battery cell (110) furthest from the inlet port (121) and outlet port (122) and closest to the connection hole (123), can be cooled to a similar degree. Therefore, the problem of cooling imbalance between the battery cells (110) can be resolved, thereby minimizing the cooling variation between the battery cells. When the temperature variation between the battery cells (110) is minimized, it is possible to prevent the degradation of a specific battery cell (110) during long-term charge / discharge cycles, which can extend the lifespan of the battery assembly and the battery pack containing it, and also ensure safety.

[0173] According to the present embodiment, the top cell frame (120a), middle cell frame (120b), and bottom cell frame (120c) may be an example structure for implementing a plurality of cooling channels (300).

[0174] The space between the middle cell frame (120b) and the bottom cell frame (120c), and the space between the top cell frame (120a) and the middle cell frame (120b) may each correspond to cooling channels (300). For example, the space between the middle cell frame (120b) and the bottom cell frame (120c) may be a second cooling channel (300b), and the space between the top cell frame (120a) and the middle cell frame (120b) may be a first cooling channel (300a). The cooling material (CL) flows into the second cooling channel (300b), which is the space between the middle cell frame (120b) and the bottom cell frame (120c), through the inlet port (121), and the cooling material (CL) after passing through the connection hole (123) passes through the first cooling channel (300a), which is the space between the middle cell frame (120b) and the top cell frame (120a), and can be discharged through the outlet port (122).

[0175] As described above, the cell frame (120) according to the present embodiment may be positioned to cover the upper surface, lower surface, and a portion of the side of the battery cells (110). The cell frame (120) may serve to fix the battery cells (110). That is, the cell frame (120) may be intended to protect the battery cells (110) and the electrical components connected thereto from external physical impact. The cell frame (120) may include a plurality of cell frame holes (120h) inside to safely position the battery cells (110). Each cell frame hole (120h) may be designed to match the shape of the battery cells (110) to provide stable support.

[0176] The battery cells (110) can be inserted into holes provided in the top cell frame (120a) and the middle cell frame (120b) and stored in the cell frame (120). The bottom cell frame (120c) can be located at the bottom, the top cell frame (120a) can be located at the top, and the middle cell frame (120b) can be located between the top cell frame (120a) and the bottom cell frame (120c).

[0177] The top cell frame (120a) may be partially open while covering the upper surface (in the +z-axis direction of FIG. 6) of the battery cells (110). Specifically, the top cell frame (120a) may be open to correspond to the shape of each battery cell (110). The upper portions of the battery cells (110) may be partially fitted into the top cell frame holes (120ah) inside the top cell frame (120a). The circumference of the top cell frame holes (120ah) that form part of the top cell frame (120a) may correspond to the circumference of the battery cells (110).

[0178] The middle cell frame (120b) may be open on both sides while covering a portion of the sides of the battery cells (110). Specifically, the middle cell frame (120b) may be open to correspond to the shape of each battery cell (110). The middle portions of the battery cells (110) may be partially fitted into the middle cell frame holes (120bh) inside the middle cell frame (120b). The perimeter of the middle cell frame holes (120bh) forming part of the middle cell frame (120b) may correspond to the perimeter of the battery cell (110).

[0179] The bottom cell frame (120c) can be positioned below the battery cells (110) while covering the lower surface of the battery cells (110). The bottom cell frame (120c) may be provided with a bottom cell frame hole (120ch) that guides the discharge of venting gas.

[0180] The top cell frame (120a), middle cell frame (120b), and bottom cell frame (120c) may be a structure that is combined with each other while housing the battery cells (110). The top cell frame (120a), middle cell frame (120b), and bottom cell frame (120c) can physically protect the battery cells (110).

[0181] Through a structure in which a battery cell (110) is fitted into the middle cell frame hole (120bh) of the middle cell frame (120b), the battery cells (110) are guided to an accurate position, thereby improving assembly precision. As the battery cells (110) are sequentially fitted into the middle cell frame hole (120bh) and the top cell frame hole (120ah) to become an integrated unit, the battery cells (110) and the entire cell frame (120) form a single rigid structure, which can increase resistance to external shocks or vibrations.

[0182] Additionally, the battery cells (110) can be combined and fixed to the plate (130) or bottom cell frame (120c) via a waterproof adhesive (150), particularly a third waterproof adhesive (150). This allows the battery cells (110) to be fixed in a predetermined position within the cell frame (120), and this structure can have excellent durability in vibration testing.

[0183] In addition, since the plate (130) is manufactured as a separate component apart from the bottom cell frame (120c), there is no need to make the thickness of the bottom cell frame (120c) thin to account for venting performance, making it easier to secure structural rigidity. The plate (130) may be manufactured to include a notching portion (130a) if necessary and designed to rupture at a pressure above a certain level, which may be an advantage that is difficult to achieve in a conventional structure integrated as a single component. Consequently, since the bottom cell frame (120c) is separated from the separate plate (130), sufficient thickness can be secured for structural rigidity, which can improve space efficiency by optimizing the rigidity-to-weight ratio of the entire battery pack (1000). Furthermore, this separated structure is advantageous in the manufacturing process, allowing the bottom cell frame (120c) and the plate (130) to be produced using optimized materials and manufacturing methods, thereby simultaneously improving productivity and quality.

[0184] The cooling material (CL) discharged through the outlet port (122) can be moved outside the system or cooled again through a heat exchanger and recirculated. Through this, the cooling material can continuously maintain its cooling capacity and continuously perform heat removal inside the battery pack (1000).

[0185] Meanwhile, the battery pack (1000) according to the present embodiment may include a waterproof adhesive (150) to stably fix the battery cells (110) within the cell frame (120) and prevent the cooling material from being discharged into the cell frame (120). The waterproof adhesive (150) covering the venting portion (110a) of the battery cell (110) and located on the bottom cell frame (120c) or plate (130) may be a third waterproof adhesive (150c). Since this third waterproof adhesive (150c) overlaps with the previously described details, it is omitted.

[0186] The waterproof adhesive (150) may include a first waterproof adhesive (150a) applied on the top cell frame (120a). Due to the first waterproof adhesive (150a) applied on the top cell frame (120a), the cooling material (CL) may be prevented from leaking beyond the top cell frame (120a) to the upper region of the top cell frame (120a). With the battery cell (110) mounted in the top cell frame hole (120ah) of the top cell frame (120a), the first waterproof adhesive (150a) may be applied to the upper surface of the top cell frame (120a) and the upper region of the battery cell (110).

[0187] Electrical connections between battery cells (110) can be made by a bus bar (160). Electrical connections by the bus bar (160) can be made at the top of the cell frame (120), that is, at the top of the top cell frame (120a). The bus bar (160) can be located at the top of the cell frame (120), that is, at the top of the top cell frame (120a). At least a portion of the bus bar (160) can be surrounded by a first waterproof adhesive (150a). Additionally, the surrounding space of the bus bar (160) can be filled with the first waterproof adhesive (150a). Additionally, the gap between the top cell frame hole (120ah) and the battery cell (110) fitted therein can be filled with the first waterproof adhesive (150a). Due to the first waterproof adhesive (150a), the cooling material (CL) can be prevented from leaking into the upper region of the cell frame (120). In the battery assembly (100), the waterproof sealing structure at the top can be implemented by the first waterproof adhesive (150a).

[0188] The waterproof adhesive (150) may include a second waterproof adhesive (150b) applied on the middle cell frame (120b). It is preferable that the first cooling channel (300a) and the second cooling channel (300b) are not connected to each other until the cooling material (CL) reaches the connection hole (123). That is, the first cooling channel (300a) and the second cooling channel (300b) can be connected to each other only through the connection hole (123). This is because it creates a difference in the order of contact with the cooling material (CL) for each part of the various battery cells (110) and reduces the cooling variation of the battery cells. The second waterproof adhesive (150b) can prevent the cooling material (CL) of the first cooling channel (300a) from moving to the second cooling channel (300b) or the cooling material (CL) of the second cooling channel (300b) from moving to the first cooling channel (300a) in the portion excluding the connection hole (123). A waterproof airtight structure between the first cooling channel (300a) and the second cooling channel (300b), excluding the connection hole (123), can be formed by the second waterproof adhesive (150b). The gap between the middle cell frame hole (120bh) and the battery cell (110) fitted therein can be filled with the second waterproof adhesive (150b).

[0189] Referring again to FIGS. 1 to 4 and FIGS. 11 to 13, a battery pack (1000) according to another embodiment of the present invention further comprises a Battery Disconnect Unit (BDU) module (1500) for controlling the electrical connection of battery cells (110); and a Battery Management System (BMS) module (1600) for monitoring and controlling the operation of battery cells (110), wherein the BDU module (1500) and the BMS module (1600) may be disposed between a venting channel (140) and a venting device (1400) provided in a pack frame (1100).

[0190] The BDU module (1500) is a component for controlling the electrical connection of the battery pack (1000) and can cut off power between the power converter and the battery pack (1000). The BDU module (1500) can ensure the safety of the battery pack (1000) by cutting off power to the battery pack (1000) when a condition occurs where the current exceeds a set range. Real-time temperature information or voltage information of the battery cell (110) can be transmitted to the BMS module (1600). The real-time operating status of the battery pack (1000) can be monitored and controlled through the BMS module (1600).

[0191] The venting device (1400) can improve safety by discharging excessive gas and pressure generated inside the battery pack (1000) to the outside. The venting device (1400) may include a vent port for discharging gas, a pressure relief valve for regulating internal pressure, a filter for filtering out particles, and a mesh. Additionally, the venting device (1400) may include a temperature sensor and a monitoring system for monitoring the temperature as needed. The venting device (1400) can discharge gas through the pressure relief valve when the internal pressure of the battery pack (1000) deviates from the normal range. The filter and the mesh can filter out particles. The flame prevention device can prevent gas ignition. The discharged gas can be safely guided to the outside through a gas discharge path. The temperature sensor and the monitoring system can monitor the internal condition of the battery pack (1000) and take appropriate measures in the event of an abnormality.

[0192] The venting device (1400) can prevent the risk of explosion or rupture and improve the stability of the battery pack (1000) by venting excessive gas and pressure generated inside the battery pack (1000) to the outside. In addition, it can lower the temperature of the battery cell (110) by releasing heat to the outside and maintain a clean internal environment of the battery pack (1000) by removing harmful gases and particles.

[0193] The venting gas discharged from the venting section (110a) may be at a high temperature, and if this gas comes into direct contact with the BDU module (1500) and BMS module (1600), the operational stability of the BDU module (1500) and BMS module (1600) may be reduced. As the venting gas flows along the venting channel (140), the temperature may be lowered, thereby preventing the high-temperature venting gas or particles from causing damage to the BDU module (1500) and BMS module (1600). Through this, the electronic components of the BDU module (1500) and BMS module (1600) may be prevented from being damaged or contaminated by the gas or particles, and the lifespan and reliability of the BDU module (1500) and BMS module (1600) may be extended. In addition, by utilizing the space between the venting channel (140) and the venting device (1400) to arrange the BDU module (1500) and the BMS module (1600), the space utilization within the battery pack (1000) can be optimized. That is, the design efficiency of the battery pack (1000) can be increased, and the battery pack (1000) can be designed with a more compact structure.

[0194] According to another embodiment of the present invention, a device including a battery pack (1000) is provided.

[0195] One or more battery cells (110) according to the embodiment described above can be mounted together with various control and protection systems, such as a BMS module (1600), a BDU module (1500), and a cooling system, to form a battery pack (1000). Specifically, it can be applied to means of transportation such as electric bicycles, electric vehicles, and hybrids, but is not limited thereto and can be applied to various devices capable of using secondary batteries.

[0196] 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.

[0197] 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.

[0198] Explanation of the symbols

[0199] 100: Battery assembly

[0200] 110: Battery cell

[0201] 120: Cell Frame

[0202] 130: Plate

[0203] 140: Venting Channel

[0204] 150: Waterproof adhesive

[0205] 1000: Battery pack

[0206] 1100: Pack Frame

[0207] 1200: Pack Cover

[0208] 1400: Venting device

Claims

1. A battery assembly comprising a plurality of battery cells including a venting portion; A pack frame in which the above battery assembly is housed; A plate facing the venting portion of the above battery cells; A cooling material that is in direct contact with the battery cells and circulates inside the battery assembly; and A waterproof adhesive that separates the venting portion of the battery cell and the cooling material; comprising A battery pack having a venting channel formed in at least one of the space between the plate and the pack frame, or inside the pack frame, for guiding the venting gas discharged from the venting section.

2. In Paragraph 1, The above venting channel is a battery pack disposed at the bottom of the above battery cells.

3. In Paragraph 1, The above venting channel is a battery pack located between the above plate and the above pack frame.

4. In Paragraph 1, The above venting channel is a battery pack communicating with a venting device provided in the pack frame.

5. In Paragraph 1, The above waterproof adhesive covers at least a portion of one side of the battery cell where the venting portion is located, in a battery pack.

6. In Paragraph 1, The above waterproof adhesive is a battery pack that covers a portion of the side of the battery cell.

7. In Paragraph 1, A battery pack having a waterproof adhesive thickness of 1 mm or more and 6 mm or less.

8. In Paragraph 1, A battery pack in which the waterproof adhesive is applied to the surface of the battery cells facing the venting portion of the plate.

9. In Paragraph 1, The battery assembly includes a cell frame that covers at least a portion of the battery cell, and The cell frame above is a battery pack including a bottom cell frame located on one side of the plate.

10. In Paragraph 9, A battery pack in which the bottom cell frame and the plate are separate structures.

11. In Paragraph 9, The above bottom cell frame includes a bottom cell frame hole corresponding to the venting portion of the battery cell, and A battery pack in which the above plate covers the above bottom cell frame hole.

12. In Paragraph 1, The above plate has a thickness of 0.5 mm or more and 1.0 mm or less, and is a battery pack comprising a metal material.

13. In Paragraph 1, The above plate is a battery pack that is an injection-molded product with a thickness of 1.0 mm or more and 2.0 mm or less.

14. In Paragraph 1, The plate is a battery pack that is positioned to correspond to the venting part and includes a notch part that ruptures at a pressure of a certain level or higher.

15. In claim 14, The notch part is a battery pack having a circular or cross (十) or X shape.

16. In claim 14, The thickness of the notch part is a battery pack that is 0.25 mm or more and 0.5 mm or less.

17. In claim 1, The battery assembly is a battery pack that includes an inlet port and an outlet port for circulating the cooling material.

18. In claim 17, The battery assembly includes a cell frame that covers at least a part of the battery cells, The cell frame includes a top cell frame, a middle cell frame, and a bottom cell frame, The cooling material is introduced through the inlet port into the space between the middle cell frame and the bottom cell frame, passes through the space between the middle cell frame and the top cell frame, and is discharged through the outlet port.

19. In claim 1, A BDU (Battery Disconnect Unit) module for controlling the electrical connection of the battery cells; and A BMS (Battery Management System) module for monitoring and controlling the operation of the battery cells; are further included, The battery pack in which the BDU module and the BMS module are disposed between the venting channel and a venting device provided in the pack frame.

20. A device including the battery pack according to claim 1.

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