Battery assembly and device comprising same

Abstract

A battery assembly according to one embodiment of the present invention comprises: a plurality of battery cells; a housing in which the battery cells are accommodated; a venting unit, which is coupled to the housing and discharges a venting gas; and an inlet and an outlet for circulating a coolant into the housing, wherein the venting unit includes: a venting part that can be opened or ruptured according to a change in pressure inside the housing; and a container positioned outside the venting part.

Description

Battery assembly and device including the same

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

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0198685 filed on December 27, 2024, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification.

[0003] The present invention relates to a battery assembly and a device including the same, and more specifically, to a battery assembly with improved internal pressure management and thermal management 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] Rechargeable batteries are primarily classified into unit cells, battery modules, and battery packs based on the arrangement and structure of the battery cells. In particular, in high-power applications such as medium-to-large devices or electric vehicles, battery assemblies are used to increase capacity and output by connecting multiple battery cells in series or parallel. Such battery assemblies consist of a stack of battery cells, a housing to protect and cool them, a terminal assembly for electrical connections, and a venting unit to ensure safety.

[0009] However, thermal runaway or internal pressure increases occurring during the use of battery assemblies pose a significant threat to safety, as they can lead to cell degradation, performance loss, and, in severe cases, explosions. To address these issues, there is a growing need to develop technologies that efficiently manage heat and pressure within battery assemblies.

[0010] In particular, technologies that effectively dissipate heat within the battery assembly and safely vent gases in the event of pressure increases are considered key technologies capable of simultaneously improving the performance and safety of the battery assembly. These technologies play a crucial role in ensuring the long-term reliability of the battery and enabling the stable operation of high-performance systems, such as electric vehicles.

[0011] The problem that the present invention aims to solve is to effectively prevent the risk of explosion and fire caused by thermal runaway and excessive internal pressure rise that may occur within a battery assembly, and specifically to provide a battery assembly with improved safety and reliability by stably relieving internal pressure, 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 assembly according to one embodiment of the present invention comprises: a plurality of battery cells; a housing in which the battery cells are accommodated; a venting unit coupled to the housing and discharging venting gas; and an inlet and an outlet for circulating a refrigerant into the housing; wherein the venting unit comprises: a venting portion that can be opened or ruptured according to a change in pressure inside the housing; and a container located outside the venting portion.

[0014] The above venting part may be ruptured by venting gas generated from the battery cells.

[0015] The above container can close a portion of the lower part of the venting section on the outside of the venting section.

[0016] The above venting unit includes a holder fixed to the outer surface of the housing, and the container may be provided in the holder.

[0017] If the venting part is ruptured by the venting gas generated in the battery cells, the venting gas can be discharged from the venting part.

[0018] The refrigerant leaking from the venting section can be maintained in the container.

[0019] The above container may be in the shape of a quarter sphere that covers a lower part of the venting section.

[0020] The above venting portion changes shape according to a change in pressure inside the housing, and the venting unit may include a rupture-inducing portion capable of rupturing the venting portion when the shape of the venting portion changes.

[0021] The above venting portion may be in the form of a hemispherical plate protruding inward toward the housing.

[0022] The above-mentioned rupture-inducing portion is located on the outer side of the above-mentioned venting portion and may include a blade portion.

[0023] The above venting portion protrudes inward toward the housing, and the direction of protrusion can be reversed by the venting gas generated from the battery cells.

[0024] When the protrusion direction of the venting portion is reversed, the venting portion may be ruptured by the rupture-inducing portion, and the venting gas may be discharged.

[0025] According to another embodiment of the present invention, a device including the battery assembly is provided.

[0026] According to an embodiment of the present invention, the venting unit reacts sensitively to pressure changes inside the housing, and can rapidly discharge venting gas by opening or rupturing the venting section upon an abnormal increase in pressure. This effectively relieves pressure inside the battery assembly, thereby preventing dangerous situations such as explosions and fires. Additionally, by placing a container on the outside of the venting section, the leakage of refrigerant circulating inside the housing while venting the gas can be minimized.

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

[0028] FIG. 1 is a perspective view showing a battery assembly according to one embodiment of the present invention.

[0029] Figure 2 is a plan view showing the battery assembly of Figure 1.

[0030] Figure 3 is a plan view showing the battery assembly of Figure 1 viewed from a different angle than that of Figure 2.

[0031] Figure 4 is an exploded perspective view showing the battery assembly of Figure 1.

[0032] FIG. 5 is a partial perspective view showing a part of the battery assembly of FIG. 1.

[0033] FIG. 6 is an exploded perspective view showing the relationship between the venting unit and the housing in the battery assembly of FIG. 5.

[0034] Figure 7 is a plan view showing the battery assembly of Figure 1 viewed from a different angle than that of Figures 2 and 3.

[0035] FIG. 8 is a perspective view showing a venting unit according to one embodiment of the present invention.

[0036] FIG. 9 is a plan view showing the venting unit of FIG. 8.

[0037] FIG. 10 is a plan view showing the venting unit of FIG. 8 viewed from a different angle than FIG. 9.

[0038] FIG. 11 is an exploded perspective view showing the venting unit of FIG. 8.

[0039] FIG. 12 is a plan view showing the venting unit of FIG. 11.

[0040] FIG. 13 is a cross-sectional view showing a cross-section cut along the cutting line A-A' of FIG. 10.

[0041] FIG. 14 is a cross-sectional view showing a cross-section cut along the cutting line B-B' of FIG. 2.

[0042] FIG. 15 is a cross-sectional perspective view showing the battery assembly of FIG. 14.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] FIG. 1 is a perspective view showing a battery assembly (100) according to an embodiment of the present invention. FIG. 2 is a plan view showing the battery assembly (100) of FIG. 1. FIG. 3 is a plan view showing the battery assembly (100) of FIG. 1 viewed from an angle different from FIG. 2. FIG. 4 is an exploded perspective view showing the battery assembly (100) of FIG. 1. FIG. 5 is a partial perspective view showing a part of the battery assembly (100) of FIG. 1. FIG. 6 is an exploded perspective view showing the relationship between the venting unit (130) and the housing (120) in the battery assembly (100) of FIG. 5. FIG. 7 is a plan view showing the battery assembly (100) of FIG. 1 viewed from an angle different from FIG. 2 and FIG. 3. FIG. 8 is a perspective view showing a venting unit (130) according to an embodiment of the present invention. FIG. 9 is a plan view showing the venting unit (130) of FIG. 8. FIG. 10 is a plan view showing the venting unit (130) of FIG. 8 viewed from an angle different from that of FIG. 9. FIG. 11 is an exploded perspective view showing the venting unit (130) of FIG. 8. FIG. 12 is a plan view showing the venting unit (130) of FIG. 11. FIG. 13 is a cross-sectional view showing a cross-section cut along the cutting line A-A' of FIG. 10. FIG. 14 is a cross-sectional view showing a cross-section cut along the cutting line B-B' of FIG. 2. FIG. 15 is a cross-sectional perspective view showing the battery assembly (100) of FIG. 14.

[0050] Referring to FIGS. 1 to 15, a battery assembly (100) according to one embodiment of the present invention comprises: a plurality of battery cells (110); a housing (120) in which the battery cells (110) are accommodated; a venting unit (130) coupled to the housing (120) and emitting venting gas; and an inlet (140) and an outlet (150) for circulating a refrigerant into the housing (120). The venting unit (130) comprises a venting section (131) that can be opened or ruptured according to a change in pressure inside the housing (120); and a container (132) located outside the venting section (131).

[0051] The battery cell (110) according to the present embodiment may be of various forms, for example, a pouch-type battery cell, a prismatic battery cell, or a cylindrical battery cell. The battery cell (110) according to the present embodiment may be a pouch-type battery cell (110). Although the following description focuses on a pouch-type battery cell (110), the battery cell according to the present embodiment is not limited thereto, and various types of battery cells may be applied.

[0052] In the battery assembly (100), battery cells (110) may be provided in multiple numbers. For example, multiple battery cells (110) may be stacked along one direction to form a battery cell stack so that they can be electrically connected to each other.

[0053] The housing (120) is a structure that covers the sides and top and bottom surfaces of the battery cell stack, and can protect the battery cell stack from external impacts and the environment. The side and bottom surfaces of the housing (120) may be a single, integrated structure. This simplifies the assembly and manufacturing process of the battery assembly (100) and improves the structural strength of the battery assembly (100). The housing (120) may be made of high-strength metal or high-strength plastic to withstand external impacts on the battery and provide a cooling path.

[0054] The battery cells (110) can be fixed inside the housing (120) and maintained stably. By stably fixing the battery cells (110) to the housing (120), positional changes of the battery cells (110) can be minimized. This protects the battery cells (110) from external shocks or vibrations, thereby preventing performance degradation of the battery assembly (100) and extending the lifespan of the battery cells (110). Additionally, the fixing structure of the battery cells (110) is simple, which can reduce manufacturing costs and facilitate maintenance of the battery assembly (100).

[0055] The refrigerant according to the present embodiment may be introduced into the housing (120) through the inlet (140) and then discharged outside the battery assembly (100) through the outlet (150). At this time, the refrigerant may be a fluid. For example, the refrigerant may be cooling oil, insulating oil, or cooling water. However, since the refrigerant comes into direct contact with the battery cells (110), other electrical components, etc., within the battery assembly (100), it may be electrically insulating. Therefore, the refrigerant may be insulating oil as a material having insulating properties.

[0056] Specifically, the heat of the battery cell stack can be effectively managed by circulating a refrigerant inside the housing (120). By circulating the refrigerant in direct contact with the battery cell stack, the heat of the battery cell (110) can be efficiently released.

[0057] The venting unit (130) according to the present embodiment is sensitive to changes in internal pressure of the housing (120) and can safely protect the battery system even in abnormal situations. The venting unit (130) may include a venting section (131) and a container (132). The venting section (131) may be designed to open or rupture when the internal pressure of the housing (120) rises. Normally, it may be maintained in a stable state to withstand internal pressure, but if venting gas is generated due to abnormal operation of the battery cell (110) (e.g., overcharging, overheating) and the internal pressure of the housing (120) exceeds a specific level (e.g., 5 Bar), the venting section (131) may be inverted or ruptured.

[0058] The container (132) according to the present embodiment may be located outside the venting section (131) and may serve to prevent refrigerant leakage while guiding the venting gas discharged from the venting section (131) to the outside. The container (132) may have a structure capable of stably containing the refrigerant that may leak out when the venting gas is discharged. That is, the container (132) can physically separate the refrigerant and the venting gas to prevent the refrigerant from leaking out while maintaining the insulation state of the battery assembly (100).

[0059] The container (132) can be made of aluminum alloy or stainless steel and can maintain structural stability even in high temperature and high pressure environments. A PTFE (polytetrafluoroethylene) coating can be applied to the interior to prevent chemical reactions with the refrigerant and provide stable performance over the long term. The capacity of the container (132) can be designed, for example, to be between 10 ml and 20 ml, and can sufficiently contain the amount of refrigerant leakage that may occur during venting gas discharge.

[0060] Referring again to FIGS. 1 to 15, the venting portion (131) can be ruptured by the venting gas generated from the battery cells (110).

[0061] The venting section (131) according to the present embodiment may rupture by protruding outward when internal pressure increases. The rupture mechanism may be achieved by the structural design of the venting section (131). It may be designed so that uniform cracks are formed on the surface of the venting section (131), and these cracks may provide a gas discharge path to immediately relieve pressure. The cracks may extend across the entire surface of the venting section (131), allowing venting gas to be rapidly discharged outward.

[0062] The size and thickness of the venting section (131) can be optimized according to internal pressure conditions. The venting section (131) can be placed at a specific location in the housing (120) so that the venting gas can be discharged quickly, which can contribute to balancing the heat and pressure distribution inside the battery assembly (100).

[0063] That is, the venting section (131) is designed to rupture quickly due to the venting gas generated from the battery cell (110), thereby effectively relieving the internal pressure of the battery assembly (100). This significantly reduces the risk of explosion caused by thermal runaway of the battery cell (110) and ensures user safety. The venting section (131) can rupture in a timely manner by reacting sensitively to pressure changes, and damage to the battery cell (110) can be minimized by venting the internal gas to the outside.

[0064] Referring again to FIGS. 1 to 15, the container (132) can close a lower part of the venting section (131) on the outside of the venting section (131).

[0065] The container (132) according to the present embodiment is positioned on the outside of the venting section (131) and can prevent leakage of refrigerant that may occur during the venting gas discharge process by closing a portion of the lower part of the venting section (131). The container (132) may have a structure that stably surrounds the lower part and side of the venting section (131) and may be designed to effectively collect the refrigerant discharged from the venting section (131).

[0066] The venting gas discharged from the venting section (131) can be released to the outside through the top opening of the container (132), and the leaked refrigerant can be collected inside the container (132). By preventing the refrigerant from leaking into the external environment, secondary accidents such as explosion or fire of the battery assembly (100) can be prevented.

[0067] The container (132) may include an open top portion that encloses the lower part of the venting portion (131) and allows the venting gas to be safely released to the outside. The container (132) may be securely fixed to the outside of the housing (120) and may be designed with a detachable structure to facilitate maintenance and replacement.

[0068] Referring again to FIGS. 1 to 15, the venting unit (130) includes a holder (133) fixed to the outer surface of the housing (120), and a container (132) may be provided in the holder (133).

[0069] The holder (133) according to the present embodiment performs the role of stably supporting the container (132) outside the housing (120), thereby supporting the container (132) to operate in a state where it is accurately aligned with the venting part (131). That is, the holder (133) can perform the role of stably fixing the venting part (131) and the container (132), and can support the container (132) and the venting part (131) to operate in a state where they are accurately aligned even in a repetitive venting situation.

[0070] The holder (133) can be made of stainless steel, aluminum alloy, or high-strength plastic material and can be firmly fixed to the outer surface of the housing (120) by screw fastening, pressing, or welding. The holder (133) may have a structure that supports the container (132) so that it is in close contact with the venting part (131), and may be designed so that the container (132) can be easily attached and detached. For example, the container (132) may be mounted to the holder (133) in a sliding manner or fastened with screws, so that maintenance and replacement work can be easy.

[0071] That is, the venting unit (130) is fixed to the outer surface of the housing (120) to stably maintain the position of the venting section (131) and the container (132). Through this, the venting section (131) and the container (132) can operate stably even in repeated venting situations, and the venting gas generated in the venting section (131) can be quickly released to the outside while preventing the refrigerant from leaking out.

[0072] Referring again to FIGS. 1 to 15, when the venting part (131) is ruptured by the venting gas generated from the battery cells (110), the venting gas can be discharged from the venting part (131).

[0073] Venting gas generated from the battery cell (110) can increase the internal pressure of the housing (120), and this increase in pressure may cause the venting section (131) to rupture. Venting gas released from the ruptured venting section (131) can be directed outside the battery assembly (100). The container (132) can block the leaked refrigerant from flowing out.

[0074] The top of the container (132) may have an open structure so that venting gas can be quickly discharged, and a space for collecting refrigerant may be provided inside. This reduces the risk of explosion inside the battery assembly (100) and prevents thermal runaway from spreading to adjacent cells. That is, the venting section (131) provides a path for gas discharge, and by safely discharging the gas to the outside, damage to the battery assembly (100) can be minimized.

[0075] Referring again to FIGS. 1 to 15, the refrigerant leaking from the venting section (131) can be maintained in a state contained in the container (132).

[0076] The size and capacity of the container (132) according to the present embodiment can be designed according to the amount of refrigerant leakage that may occur in the venting section (131). For example, the container (132) may have a storage capacity of 10 ml or more and 20 ml or less, so that the leaked refrigerant can be stably collected even in a repetitive venting situation. In addition, the container (132) may include a sealed structure so that the refrigerant can be maintained in a contained state, thereby preventing the refrigerant from flowing out to the external environment. That is, by preventing the refrigerant from leaking out to the external environment, the container (132) can prevent secondary accidents such as explosion or fire of the battery assembly (100).

[0077] Referring again to FIGS. 1 to 15, the container (132) may be in the shape of a quarter sphere covering a lower part of the venting section (131).

[0078] As illustrated in the drawing, the container (132) is designed in a quarter-spherical shape that covers the lower part of the venting section (131), thereby effectively preventing refrigerant leakage that may occur during venting gas discharge. The quarter-spherical shape of the container (132) may have a structure that surrounds the lower part of the venting section (131), so that it can act as a physical barrier to prevent refrigerant from flowing out to the outside while the venting gas is being discharged.

[0079] Additionally, the quarter-spherical shape of the container (132) has a structure that surrounds the lower and side of the venting section (131) while having an open upper section, thereby providing a path through which the venting gas can be quickly discharged to the outside. This shape can be designed so that the container (132) can perform the functions of collecting refrigerant and discharging gas to the maximum extent while using the minimum amount of space.

[0080] The quarter-spherical shape of the container (132) can smoothly form a gas discharge path through a curved structure. This reduces turbulence that may occur during the venting gas discharge process and helps the gas to be smoothly discharged to the outside. When the gas flow is smooth, the venting speed is increased and internal pressure can be quickly relieved, thereby increasing the stability of the battery assembly (100).

[0081] The quarter-spherical shape of the container (132) can provide strong structural stability against external impacts or internal pressure changes due to its curved design. The spherical shape has the characteristic of evenly distributing stress, which can minimize the possibility of deformation even in high-pressure environments. This can support the container (132) to operate stably without damage even in repeated venting situations.

[0082] Referring again to FIGS. 1 to 15, the venting portion (131) changes shape according to pressure change inside the housing (120), and the venting unit (130) may include a rupture-inducing portion (134) capable of rupturing the venting portion (131) when the shape of the venting portion (131) changes.

[0083] The rupture-inducing part (134) according to the present embodiment can perform the function of relieving pressure inside the battery assembly (100) by rapidly rupturing the venting part (131) according to the shape change of the venting part (131). The rupture-inducing part (134) may be positioned outside the venting part (131), and the rupture-inducing part (134) can induce a crack on the surface of the venting part (131) by applying intensive stress to the venting part (131) when the venting part (131) is inverted or deformed due to the increase in internal pressure of the housing (120).

[0084] The rupture-inducing portion (134) can support smooth gas discharge by inducing a crack on the surface of the venting portion (131) through a change in the shape of the venting portion (131). Through this, the safety of the battery assembly (100) can be improved, and the thermal runaway phenomenon can be prevented from spreading to adjacent battery cells (110).

[0085] Referring again to FIGS. 1 to 15, the venting portion (131) may be in the form of a hemispherical plate protruding inward toward the housing (120).

[0086] The hemispherical shape of the venting section (131) can be designed to allow for smooth venting of gas by providing a uniform rupture path. This structure can improve the stability of the battery assembly (100) and prevent secondary accidents such as explosions or fires.

[0087] Referring again to FIGS. 1 to 15, the rupture-inducing portion (134) is located on the outside of the venting portion (131) and may include a blade portion.

[0088] The blade portion according to the present embodiment may have a structure that forms a crack by coming into contact with the venting portion (131) when the venting portion (131) is inverted or deformed due to an increase in internal pressure of the housing (120). The blade portion may be designed to generate high stress concentration at a specific part of the venting portion (131) and may provide an optimal crack path through which the venting gas can be released. As a result, the venting gas can be rapidly discharged to the outside, and the pressure inside the battery assembly (100) can be effectively relieved. That is, the blade portion can concentrate stress at a specific point of the venting portion (131) to support the rapid and uniform formation of cracks on the surface of the venting portion (131). Through this, the venting gas can be safely and efficiently discharged, and the pressure distribution inside the battery assembly (100) can be stably managed.

[0089] Referring again to FIGS. 1 to 15, the venting portion (131) protrudes inward toward the housing (120), and the direction of protrusion can be reversed by the venting gas generated from the battery cells (110).

[0090] In the present embodiment, the venting part (131) has its protrusion direction reversed when the pressure inside the housing (120) of the battery assembly (100) rises abnormally, and may rupture by interacting with the rupture-inducing part (134) during this process. The venting part (131) can maintain a stable structure to withstand normal pressure inside the housing (120) under normal conditions, and can be designed so that its protrusion direction reverses outward when pressure exceeding a set threshold occurs. Through this design, the venting part (131) can respond sensitively to pressure changes and can provide a structure capable of rapidly relieving internal pressure.

[0091] The shape of the venting section (131) may change according to the pressure change inside the housing (120), and in this process, it may perform the function of rupturing the venting section (131) by interacting with the rupture-inducing section (134). Specifically, when the internal pressure of the housing (120) exceeds a specific threshold (e.g., 5 Bar) due to the venting gas generated from the battery cell (110), the protrusion direction of the venting section (131) may be reversed outward. This reversal process acts as a preliminary step to rupture to quickly relieve the internal pressure of the housing (120), and a crack may occur on the surface of the venting section (131) by the rupture-inducing section (134), thereby allowing the venting gas inside the housing (120) to be discharged to the outside.

[0092] Referring again to FIGS. 1 to 15, when the protrusion direction of the venting portion (131) is reversed, the venting portion (131) can be ruptured by the rupture-inducing portion (134) and venting gas can be discharged.

[0093] The venting section (131) according to the present embodiment may be designed to be inverted according to the internal pressure of the housing (120), and for this purpose, the structural design of the venting section (131) may be optimized. The material and thickness of the venting section (131) may be selected so that it can operate stably without deformation even under repeated pressure changes.

[0094] The venting section (131) may have its protrusion direction reversed when pressure rises abnormally inside the housing (120) of the battery assembly (100), and may rupture by interacting with the rupture-inducing section (134) during this process. The venting section (131) may maintain a stable structure to withstand normal pressure inside the housing (120) under normal conditions, and may be designed so that its protrusion direction reverses outward when pressure exceeding a set threshold occurs. Through this design, the venting section (131) can respond sensitively to pressure changes and provide a structure capable of rapidly relieving internal pressure.

[0095] The inverted venting section (131) can be designed to come into contact with the rupture induction section (134) to form a crack at an accurate location. This design helps to effectively vent the venting gas while mitigating thermal runaway or excessive pressure rise situations inside the battery assembly (100). That is, the shape change of the venting section (131) can allow the venting gas to be safely released to the outside through interaction with the rupture induction section (134). This can significantly reduce the risk of thermal runaway and explosion and improve the safety of the battery assembly (100).

[0096] The rupture-inducing portion (134) is located on the outer side of the venting portion (131) and can perform the role of inducing rupture by contacting the surface of the venting portion (131) when the venting portion (131) is inverted. The rupture-inducing portion (134) can form uniform cracks on the surface of the venting portion (131) by optimizing the contact area with the venting portion (131) and applying intensive stress to the venting portion (131). These cracks provide a path for the venting gas to be rapidly discharged to the outside and can effectively relieve internal pressure.

[0097] According to another embodiment of the present invention, a device including a battery assembly (100) is provided.

[0098] One or more battery assemblies (100) according to the embodiment described above can be mounted together with various control and protection systems, such as a Battery Management System (BMS), a Battery Disconnect Unit (BDU), and a cooling system, to form a device.

[0099] The battery assembly (100) can be applied to various devices. 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.

[0100] 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 observer.

[0101] 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.

[0102] Explanation of the symbols

[0103] 100: Battery assembly

[0104] 110: Battery cell

[0105] 120: Housing

[0106] 130: Venting Unit

[0107] 131: Banting Department

[0108] 132: Container

[0109] 133: Holder

[0110] 134: Rupture induction part

[0111] 140: Inlet

[0112] 150: Outlet

Claims

1. Multiple battery cells; A housing in which the above battery cells are accommodated; A venting unit coupled to the above housing and discharging venting gas; and It includes an inlet and an outlet for circulating refrigerant into the housing; and A battery assembly comprising: a venting unit, a venting portion that opens or ruptures according to a pressure change inside the housing; and a container located outside the venting portion.

2. In Paragraph 1, The above venting section is a battery assembly that ruptures due to venting gas generated from the battery cells.

3. In Paragraph 1, The above container is a battery assembly that closes a lower part of the venting portion on the outside of the venting portion.

4. In Paragraph 1, The above venting unit includes a holder fixed to the outer surface of the housing, and The above container is a battery assembly provided in the above holder.

5. In Paragraph 1, A battery assembly in which, when the venting portion is ruptured by the venting gas generated in the battery cells, the venting gas is discharged from the venting portion.

6. In Paragraph 1, A battery assembly in which the refrigerant leaking from the venting section is maintained in the container.

7. In Paragraph 1, The above container is a battery assembly having a quarter sphere shape that covers a lower part of the venting section.

8. In Paragraph 1, The above venting part changes shape according to the pressure change inside the housing, and The above-described venting unit is a battery assembly comprising a rupture-inducing member that ruptures the venting portion when the shape of the venting portion changes.

9. In Paragraph 8, The above venting portion is a battery assembly in the shape of a hemispherical plate protruding inward toward the housing.

10. In Paragraph 8, The above-mentioned rupture-inducing portion is located on the outer side of the above-mentioned venting portion and includes a blade portion, in a battery assembly.

11. In Paragraph 8, The above venting portion protrudes inward toward the interior of the housing, and The above venting portion is a battery assembly in which the direction of protrusion is reversed by the venting gas generated from the battery cells.

12. In Paragraph 11, A battery assembly in which, when the protrusion direction of the venting portion is reversed, the venting portion is ruptured by the rupture-inducing portion and the venting gas is discharged.

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

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