Battery cell assembly, battery module comprising same, battery pack and vehicle

Abstract

A battery cell assembly is disclosed. A battery cell assembly according to one embodiment of the present disclosure may include: a battery cell including an electrode assembly and a first case surrounding the electrode assembly; a second housing covering at least a portion of the first housing; and a fire extinguishing material filled between the first housing and the second housing.

Description

[0001] This application claims priority to Korean Patent Application No. 10-2023-0090629, filed in Korea on July 12, 2023, the disclosure of which is incorporated herein by reference. Technical Field

[0002] This disclosure relates to a battery cell assembly. Background Technology

[0003] With the rapid increase in demand for portable electronic products such as laptops, cameras, and mobile phones, and with the gradual commercialization of robots and electric vehicles, there is active research into high-performance rechargeable and rechargeable batteries.

[0004] Currently, commercially available rechargeable batteries include nickel-cadmium (NiCd) batteries, nickel-metal hydride (NiMH) batteries, nickel-zinc (NiZn) batteries, and lithium-ion batteries. Among them, lithium-ion batteries have become the focus due to their advantages over nickel-based batteries, such as almost no memory effect, very low self-discharge rate, high energy density, and free charging and discharging.

[0005] These lithium-ion secondary batteries typically use lithium-based oxides and carbon materials as the positive and negative electrode active materials, respectively. A lithium-ion secondary battery includes: an electrode assembly having a positive electrode plate and a negative electrode plate respectively coated with the positive and negative electrode active materials, with a separator between the positive and negative electrode plates; and a casing (i.e., battery housing) that stores and seals the electrode assembly together with the electrolyte.

[0006] Generally, based on the shape of the casing, lithium secondary batteries can be divided into can-type secondary batteries and pouch-type secondary batteries. In can-type secondary batteries, the electrode assembly is housed in a metal can, while in pouch-type secondary batteries, the electrode assembly is housed in a pouch of aluminum laminate.

[0007] Recently, rechargeable batteries have been widely used in medium and large devices for driving or energy storage (e.g., electric vehicles and energy storage systems (ESS)) as well as small devices (e.g., portable electronic devices). Multiple rechargeable batteries can be electrically connected and stored within a module housing to form a battery module. Furthermore, multiple battery modules can be connected to construct a battery pack.

[0008] However, when a large number of secondary batteries (battery cells) or battery modules are densely stored in a small space, they may be susceptible to thermal events. In particular, if an event such as thermal runaway occurs in any battery cell, high-temperature gases, flames, and heat may be generated. If this gas, flame, or heat is transferred to other battery cells included in the same battery module, an explosive chain reaction such as heat propagation may occur. Furthermore, this chain reaction may lead to accidents such as fires or explosions in other battery modules and related battery modules.

[0009] Furthermore, the risk of thermal cascading reactions can be further increased because medium and large battery packs used in electric vehicles comprise a large number of battery cells and modules to increase output and / or capacity. Additionally, in the case of battery packs installed in electric vehicles, there may be users (such as drivers) nearby. Therefore, if a thermal event occurring in a particular battery module is not controlled and leads to a cascading reaction, it could result in significant property damage and injury.

[0010] Therefore, when a thermal event occurs in a battery cell, immediate measures are required, such as supplying fire extinguishing agents. Utility Model Content

[0011] Technical issues

[0012] This disclosure aims to address the above-mentioned problems and other issues.

[0013] This disclosure also aims to provide a battery cell assembly capable of immediately supplying fire extinguishing agent in the event of a thermal event.

[0014] This disclosure also aims to provide a battery cell assembly capable of maintaining energy density while providing fire extinguishing agent.

[0015] Technical solution

[0016] According to one aspect of this disclosure, a battery cell assembly may be provided, comprising: a battery cell including an electrode assembly and a first housing configured to surround the electrode assembly; a second housing configured to cover at least a portion of the first housing; and a fire extinguishing agent configured to fill the space between the first housing and the second housing.

[0017] In addition, the second housing can be constructed of an electrically insulating material.

[0018] In addition, the second housing can be constructed of the same material as the first housing.

[0019] Additionally, the second housing may be spaced apart from at least one surface of the first housing to form a gap, and this gap may be filled with a fire extinguishing agent.

[0020] In addition, the battery cell may include electrode leads configured to protrude from the electrode assembly, and the first housing may include a stepped portion configured to surround the electrode leads, and the second housing may be spaced apart from the stepped portion to form a gap, and the gap may be filled with a fire extinguishing agent.

[0021] In addition, the battery cell assembly may also include an insulating member positioned between the electrode leads and the stepped portion and configured to surround the electrode leads.

[0022] Additionally, the insulating components may extend to expose the exterior of the tiered section.

[0023] Additionally, the insulating components may extend to be exposed to the outside of the second housing.

[0024] In addition, the first housing may include: a first portion configured to cover one side of the electrode assembly; and a second portion configured to cover the other side of the electrode assembly and joined to the first portion, and the second housing may extend to cover the portion where the first portion and the second portion are joined.

[0025] In addition, extinguishing agent can be filled around the section where the first and second parts are combined.

[0026] In addition, the extinguishing agent can be configured as Novec1230.

[0027] A battery module according to one aspect of this disclosure may include the battery cell assembly of this disclosure.

[0028] A battery pack according to one aspect of this disclosure may include the battery cell assembly of this disclosure.

[0029] A vehicle according to one aspect of this disclosure may include the battery cell assembly of this disclosure.

[0030] Beneficial effects

[0031] According to at least one embodiment of this disclosure, when a thermal event occurs in a battery cell assembly, a fire extinguishing agent can be supplied immediately, thereby improving thermal safety.

[0032] According to at least one embodiment of this disclosure, energy density can be maintained while improving thermal safety. Attached Figure Description

[0033] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the detailed description of the present invention, serve to provide a further understanding of the technical concept of the present disclosure; therefore, the present disclosure is not to be construed as limited to the drawings.

[0034] Figure 1This is a perspective view showing a battery cell assembly according to an embodiment of the present disclosure.

[0035] Figure 2 This is a diagram illustrating the manufacturing process of a battery cell assembly according to an embodiment of the present disclosure.

[0036] Figure 3 This is a perspective view showing the internal structure of a battery cell assembly according to an embodiment of the present disclosure.

[0037] Figure 4 It is schematically shown along Figure 1 The cross-sectional view of the structure cut by line A-A' in the middle.

[0038] Figure 5 It is shown Figure 4 A diagram illustrating the occurrence of thermal events.

[0039] Figure 6 It is schematically shown along Figure 1 The cross-sectional view of the structure cut by line B-B' in the diagram.

[0040] Figure 7 It is shown Figure 6 A diagram illustrating the occurrence of thermal events.

[0041] Figure 8 This is a schematic cross-sectional view of a stacked battery cell assembly according to an embodiment of the present disclosure.

[0042] Figure 9 It is shown Figure 8 A diagram illustrating the occurrence of thermal events.

[0043] Figure 10 This is a diagram showing the connection between the first housing and the electrode assembly of a battery cell assembly according to another embodiment of the present disclosure.

[0044] Figure 11 This is a diagram showing the battery cell of a battery cell assembly according to another embodiment of the present disclosure.

[0045] Figure 12 This is a diagram illustrating a battery cell assembly according to another embodiment of the present disclosure.

[0046] Figure 13 It shows stacking Figure 12 A diagram of the battery cell assembly.

[0047] Figure 14 It is schematically shown along Figure 13 The cross-sectional view of the structure cut by line C-C'.

[0048] Figure 15 It is schematically shown along Figure 13 The cross-sectional view of the structure cut by line D-D' in the middle.

[0049] Figure 16 This is a diagram showing the connection between the first housing and the electrode assembly of a battery cell assembly according to another embodiment of the present disclosure.

[0050] Figure 17 This is a diagram showing the battery cell of a battery cell assembly according to another embodiment of the present disclosure.

[0051] Figure 18 This is a diagram illustrating a battery cell assembly according to another embodiment of the present disclosure.

[0052] Figure 19 This is a diagram showing the connection between the first housing and the electrode assembly of a battery cell assembly according to another embodiment of the present disclosure.

[0053] Figure 20 This is a diagram showing the battery cell of a battery cell assembly according to another embodiment of the present disclosure.

[0054] Figure 21 This is a diagram illustrating a battery cell assembly according to another embodiment of the present disclosure. Detailed Implementation

[0055] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Before the description, it should be understood that the terminology used in the specification and appended claims should not be construed as limited to its general or dictionary meaning, but rather is interpreted based on the principle of allowing the inventors to appropriately define terms for best interpretation, and on the meanings and concepts corresponding to the technical aspects of the present disclosure.

[0056] Therefore, the embodiments and structures presented in the drawings of this specification only indicate the most preferred embodiments of this disclosure and do not represent all the technical ideas of this disclosure. It should be understood that various equivalents and modifications can be made to them when this application is filed.

[0057] Figure 1 This is a perspective view showing a battery cell assembly according to an embodiment of the present disclosure. Figure 2 This is a diagram illustrating the manufacturing process of a battery cell assembly according to an embodiment of the present disclosure. Figure 3 This is a perspective view showing the internal structure of a battery cell assembly according to an embodiment of the present disclosure. (See reference) Figures 1 to 3 The battery cell assembly according to embodiments of the present disclosure may include a battery cell 100, a second housing 200, and a fire extinguishing agent 300.

[0058] The battery cell 100 may have a pouch or cuboid shape. In this case, the battery cell 100 may indicate a secondary battery. The battery cell 100 may include an electrode assembly 110 and a first housing 130 surrounding the electrode assembly 110. The first housing 130 may seal the electrode assembly 110. In addition, the first housing 130 may insulate the electrode assembly 110.

[0059] The second housing 200 may cover at least a portion of the first housing 130. In addition, the second housing 200 may be at least partially attached, coupled, or secured to the first housing 130.

[0060] The space between the first housing 130 and the second housing 200 may be filled with extinguishing agent 300. The second housing 200 may contain, store, or seal the extinguishing agent 300. For example, the extinguishing agent 300 may be in a liquid state.

[0061] According to this configuration, immediate fire suppression can be achieved when a thermal event occurs in the battery cell 100. When a thermal event occurs, the discharged gas g and combustible particles s (such as sparks s) can melt the first housing 130 and be discharged to the outside of the battery cell 100. In this case, the fire extinguishing agent 300 disposed between the first housing 130 and the second housing 200 can be immediately supplied to the part where the thermal event occurred. Therefore, fire suppression can be performed immediately without electronic or physical control, thereby improving the thermal safety of the battery cell assembly.

[0062] refer to Figures 1 to 3 The fire extinguishing agent 300 of the battery cell assembly according to the embodiments of this disclosure can be configured as Novec1230.

[0063] According to the configuration disclosed herein, the extinguishing agent 300 can be configured as a liquid and can be non-conductive. Furthermore, the extinguishing agent 300 can rapidly absorb heat and effectively suppress the propagation of thermal events.

[0064] refer to Figures 1 to 3 The second housing 200 of the battery cell assembly according to an embodiment of the present disclosure can be constructed of an electrically insulating material.

[0065] According to the configuration disclosed herein, even in the event of a thermal event, the fire extinguishing agent 300 and the second housing 200 can prevent current leakage from the battery cell 100. Therefore, the thermal and electrical safety of the battery cell assembly can be improved.

[0066] refer to Figures 1 to 3 The second housing 200 of the battery cell assembly according to an embodiment of the present disclosure may be constructed of the same material as the first housing 130.

[0067] According to this configuration of the present disclosure, if heat is generated due to a thermal event and melts the first housing 130, the second housing 200 may also melt. For example, in the case of stacked multiple battery cell assemblies, if a thermal event occurs in one battery cell assembly causing the emission of exhaust gas g or combustible particles s, the second housing 200 of the adjacent battery cell assembly may melt, causing the fire extinguishing agent 300 provided in the adjacent battery cell assembly to leak, thereby suppressing the thermal event.

[0068] refer to Figures 1 to 3 According to embodiments of the present disclosure, the second housing 200 of the battery cell assembly may be spaced apart from at least one surface of the first housing 130 to form a gap therebetween, and the gap may be filled with fire extinguishing agent 300.

[0069] At least a portion of the second housing 200 may be spaced apart from the first housing 130. Additionally, at least a portion of the second housing 200 may be coupled, attached, or secured to the first housing 130. The second housing 200 may be spaced apart from a plurality of surfaces of the first housing 130 to form gaps.

[0070] According to the configuration disclosed herein, the extinguishing agent 300 can be positioned to surround the battery cell 100. Even if a thermal event occurs in any part of the battery cell 100, the extinguishing agent 300 can be supplied immediately. This improves the thermal safety of the battery cell assembly.

[0071] Figure 4 It is schematically shown along Figure 1 The cross-sectional view of the structure cut by line A-A' in the middle. Figure 5 It is shown Figure 4 A diagram illustrating the occurrence of thermal events. (Reference) Figure 4 and Figure 5 According to embodiments of the present disclosure, the battery cell 100 of the battery cell assembly may further include electrode leads 120 protruding from the electrode assembly 110, and the first housing 130 may include a stepped portion 133 surrounding the electrode leads 120, and the second housing 200 may be spaced apart from the stepped portion 133 to form a gap. Furthermore, the gap may be filled with a fire extinguishing agent 300.

[0072] According to the configuration of this disclosure, if a thermal event occurs causing the platform portion 133 to melt and vent gas g or combustible particles s, the extinguishing agent 300 can be immediately supplied to the melted portion of the platform portion 133.

[0073] Reference Figure 4 and Figure 5The battery cell assembly according to embodiments of the present disclosure may further include an insulating member 140 located between the electrode lead 120 and the stepped portion 133 and surrounding the electrode lead 120. The insulating member 140 may be electrically insulating. The insulating member 140 may insulate the electrode lead 120 and the stepped portion 133 from each other. Furthermore, the insulating member 140 may be configured to surround the electrode lead 120. The insulating member 140 may electrically insulate the electrode lead 120 and the second housing 200 from each other. The insulating member 140 may be attached, coupled, deposited, or coated on the electrode lead 120.

[0074] According to the configuration of this disclosure, the second housing 200 will be electrically stable even if the second housing is connected, attached or fixed to the first housing 130 or the ladder portion 133.

[0075] refer to Figure 4 and Figure 5 According to embodiments of the present disclosure, the insulating member 140 of the battery cell assembly can extend to expose the exterior of the tiered portion 133.

[0076] The insulating member 140 may protrude to be exposed to the outside of the ladder portion 133 along with the electrode leads 120. In this case, the second housing 200 may be coupled, attached, or secured to the insulating member 140.

[0077] According to this configuration of the present disclosure, the second housing 200 can be electrically insulated from the electrode leads 120 while surrounding the entire stepped portion 133. Therefore, the electrical safety of the battery cell assembly can be improved.

[0078] Reference Figure 4 and Figure 5 According to embodiments of the present disclosure, the insulating member 140 of the battery cell assembly can extend to be exposed to the outside of the second housing 200.

[0079] According to this configuration of the present disclosure, the second housing 200 and the electrode leads 120 can be physically separated from each other. As a result, the second housing 200 and the electrode leads 120 can be more reliably electrically insulated.

[0080] Figure 6 It is schematically shown along Figure 1 The cross-sectional view of the structure cut by line B-B' in the diagram. Figure 7 It is shown Figure 6 A diagram illustrating the occurrence of thermal events. (Reference) Figure 6 and Figure 7 According to embodiments of the present disclosure, the second housing 200 of the battery cell assembly can be configured to surround the entire upper surface, lower surface, and side surface of the battery cell 100. Therefore, the battery cell 100 can be completely surrounded by the fire extinguishing agent 300.

[0081] In this configuration, the ladder portion 133 may be formed on at least one of the upper or lower surfaces of the battery cell 100. The second housing 200 may be spaced apart from the ladder portion 133 to form a gap. Furthermore, the gap may be filled with fire extinguishing agent 300.

[0082] According to the configuration of this disclosure, if a thermal event occurs causing the platform portion 133 to melt and vent gas g or combustible particles s, the extinguishing agent 300 can be immediately supplied to the melted portion of the platform portion 133.

[0083] Figure 8 This is a schematic cross-sectional view of a stacked battery cell assembly according to an embodiment of the present disclosure. Figure 9 It is shown Figure 8 A diagram illustrating the occurrence of thermal events. (Reference) Figure 8 and Figure 9 Multiple battery cell assemblies according to embodiments of the present disclosure may be provided, and the multiple battery cell assemblies may be stacked on top of each other. The multiple stacked battery cell assemblies may be housed or mounted in a structure such as a housing of a battery module or a housing of a battery pack.

[0084] In this configuration, multiple battery cell assemblies can be stacked to allow them to contact each other. Furthermore, when a thermal event occurs in one of the battery cell assemblies, the emitted exhaust gas g or flammable particles s can melt the second casing 200 of the adjacent battery cell assembly. As a result, the fire extinguishing agent 300 in the adjacent battery cell assembly can leak, thereby suppressing the spread of the thermal event.

[0085] Figure 10 This is a diagram showing the connection between the first housing and the electrode assembly of a battery cell assembly according to another embodiment of the present disclosure. Figure 11 This is a diagram showing the battery cell of a battery cell assembly according to another embodiment of the present disclosure. Figure 12 This is a diagram illustrating a battery cell assembly according to another embodiment of the present disclosure.

[0086] refer to Figures 10 to 12According to another embodiment of the present disclosure, the first housing 130 of the battery cell assembly may include a first portion 131 covering one side of the electrode assembly 110 and a second portion 132 covering the other side of the electrode assembly 110 and coupled to the first portion 131. Additionally, the second housing 200 may extend to cover the portion where the first portion 131 and the second portion 132 are coupled. The first housing 130 can be formed by folding one of its components to create the first portion 131 and the second portion 132. Therefore, a stepped portion 133 of the battery cell 100 can be formed on three surfaces along the front, upper, and rear surfaces of the battery cell 100. Furthermore, the second housing 200 may form a gap along the stepped portion 133 of the battery cell 100, and this gap may be filled with a fire extinguishing agent 300. That is, the fire extinguishing agent 300 may be disposed along the front, upper, and rear surfaces of the battery cell 100. Alternatively, the fire extinguishing agent 300 may be filled around the portion where the first portion 131 and the second portion 132 are coupled. The second housing 200 may be attached, connected, or fixed to the side of the battery cell 100 or the first housing 130.

[0087] According to the configuration disclosed herein, the space occupied by the fire extinguishing agent 300 can be reduced. Furthermore, the fire extinguishing agent 300 does not need to be positioned on either side of the battery cell assembly. This can increase energy density when the battery cell assemblies are stacked along the left-right direction or the Y-axis direction.

[0088] Figure 13 It shows stacking Figure 12 A diagram of the battery cell assembly. Figure 14 It is schematically shown along Figure 13 The cross-sectional view of the structure cut by line C-C'. Figure 15 It is schematically shown along Figure 13 The cross-sectional view of the structure cut by line D-D' in the middle.

[0089] refer to Figures 13 to 15 According to another embodiment of this disclosure, battery cell assemblies can be stacked in the left-right direction or the Y-axis direction. In this case, the battery cells 100 of multiple battery cell assemblies can be arranged close to each other or in contact with each other in the left-right direction or the Y-axis direction. The fire extinguishing agent 300 disposed in the respective battery cell assembly can be arranged along the left-right direction or the Y-axis direction.

[0090] According to this configuration, when multiple battery cell assemblies are stacked, energy density can be maintained while thermal safety is improved.

[0091] Figure 16 This is a diagram showing the connection between the first housing and the electrode assembly of a battery cell assembly according to another embodiment of the present disclosure. Figure 17This is a diagram showing the battery cell of a battery cell assembly according to another embodiment of the present disclosure. Figure 18 This is a diagram illustrating a battery cell assembly according to another embodiment of the present disclosure. (See reference) Figures 16 to 18 According to another embodiment of the present disclosure, a first housing 130 of a battery cell assembly may include a first portion 131 covering one side of an electrode assembly 110 and a second portion 132 covering the other side of the electrode assembly 110 and coupled to the first portion 131. Additionally, a second housing 200 may extend to cover the portion where the first portion 131 and the second portion 132 are coupled. The first housing 130 may be formed by attaching or coupling separately provided first and second portions 131 and 132. Therefore, a stepped portion 133 of the battery cell 100 may be formed on four surfaces along the front, upper, lower, and rear surfaces of the battery cell 100. Furthermore, the second housing 200 may form a gap along the stepped portion 133 of the battery cell 100, and this gap may be filled with a fire extinguishing agent 300. That is, the fire extinguishing agent 300 may be disposed along the front, upper, lower, and rear surfaces of the battery cell 100. Alternatively, the fire extinguishing agent 300 may be filled around the portion where the first portion 131 and the second portion 132 are coupled. The second housing 200 may be attached, connected, or fixed to the side of the battery cell 100 or the first housing 130.

[0092] According to the configuration disclosed herein, the space occupied by the fire extinguishing agent 300 can be reduced. Furthermore, the fire extinguishing agent 300 does not need to be positioned on either side of the battery cell assembly. As a result, when the battery cell assemblies are stacked in the left-right direction or the Y-axis direction, the energy density can be increased.

[0093] Figure 19 This is a diagram showing the connection between the first housing and the electrode assembly of a battery cell assembly according to another embodiment of the present disclosure. Figure 20 This is a diagram showing the battery cell of a battery cell assembly according to another embodiment of the present disclosure. Figure 21 This is a diagram illustrating a battery cell assembly according to another embodiment of the present disclosure.

[0094] refer to Figure 19 and Figure 21According to another embodiment of the present disclosure, the battery cell 100 of the battery cell assembly may have two electrode leads 120 protruding in the upward direction or the +Z axis direction. A first housing 130 may include a first portion 131 covering one side of the electrode assembly 110 and a second portion 132 covering the other side of the electrode assembly 110 and coupled to the first portion 131. Additionally, a second housing 200 may extend to cover the portion where the first portion 131 and the second portion 132 are coupled. The first housing 130 can be formed by folding one of its components to create the first portion 131 and the second portion 132. Therefore, a stepped portion 133 of the battery cell 100 may be formed on three surfaces along the front, upper, and rear surfaces of the battery cell 100. Furthermore, the second housing 200 may form a gap along the stepped portion 133 of the battery cell 100, and the gap may be filled with a fire extinguishing agent 300. That is, the fire extinguishing agent 300 may be disposed along the front, upper, and rear surfaces of the battery cell 100. Alternatively, the extinguishing agent 300 can be filled around the portion where the first part 131 and the second part 132 are joined. The second housing 200 can be attached, coupled, or secured to the side of the battery cell 100 or the first housing 130. Additionally, the second housing 200 can be configured to cover only a portion of its upper surface to electrically insulate it from the electrode leads 120. For example, the second housing 200 can be configured not to cover the portion adjacent to the electrode leads 120 or the portion between the two electrode leads 120.

[0095] According to the configuration disclosed herein, the space occupied by the extinguishing agent 300 can be reduced. Furthermore, the extinguishing agent 300 does not need to be positioned on either side of the battery cell assembly. As a result, energy density can be increased when the battery cell assemblies are stacked in the left-right direction or the Y-axis direction. Additionally, the electrical insulation of the electrode leads 120 and the second housing 200 can be improved.

[0096] The battery module according to this disclosure may include two or more battery cell assemblies as described above. In addition to the battery cell assemblies, the battery module according to this disclosure may also include various components, such as components of battery modules known at the time of filing of this disclosure, such as busbar assemblies, module housings, cooling units, etc.

[0097] The battery pack according to this disclosure may also include two or more battery cell assemblies as described above. Furthermore, in addition to the battery cell assemblies, the battery pack according to this disclosure may also include various components, such as those known at the time of filing of this disclosure, such as a BMS, busbars, battery pack housing, relays, current sensors, etc.

[0098] A vehicle according to this disclosure may include two or more battery cell assemblies according to the above disclosure. The battery cell assemblies according to this disclosure can be used in vehicles such as electric vehicles or hybrid vehicles. Furthermore, in addition to the battery cell assemblies, a vehicle according to this disclosure may also include various other components included in the vehicle. For example, in addition to the battery cell assemblies according to this disclosure, a vehicle according to this disclosure may also include a body, a motor, control equipment such as an ECU (electronic control unit), etc.

[0099] Furthermore, although terms such as up, down, left, right, front, and back are used in this specification to indicate directions, it will be apparent to those skilled in the art that these terms are for ease of interpretation only and may vary depending on the position of the target object or the observer's position.

[0100] As described above, although this disclosure has been described with reference to limited embodiments and drawings, this disclosure is not limited thereto, and those skilled in the art to which this disclosure pertains can make various modifications and changes within the scope of the technical concept of this disclosure and the equivalents of the claims described below.

Claims

1. A battery cell assembly, characterized in that, The battery cell assembly includes: A battery cell, the battery cell including an electrode assembly and a first housing configured to surround the electrode assembly; A second housing, configured to cover at least a portion of the first housing; and The extinguishing agent is configured to fill the space between the first housing and the second housing.

2. The battery cell assembly according to claim 1, Its features are, The second housing is constructed of an electrically insulating material.

3. The battery cell assembly according to claim 1, Its features are, The extinguishing agent is liquid and non-conductive.

4. The battery cell assembly according to claim 1, Its features are, The second housing is constructed of the same material as the first housing.

5. The battery cell assembly according to claim 1, Its features are, The second housing is spaced apart from at least one surface of the first housing to form a gap, and The gap is filled with the fire extinguishing agent.

6. The battery cell assembly according to claim 1, Its features are, The battery cell also includes electrode leads configured to protrude from the electrode assembly. The first housing includes a stepped portion configured to surround the electrode leads. The second housing is spaced apart from the ladder section to form a gap, and The gap is filled with the fire extinguishing agent.

7. The battery cell assembly according to claim 6, Its features are, The battery cell assembly also includes an insulating member positioned between the electrode leads and the stepped portion and configured to surround the electrode leads.

8. The battery cell assembly according to claim 7, Its features are, The insulating member extends to expose the exterior of the tiered section.

9. The battery cell assembly according to claim 7, Its features are, The insulating member extends to be exposed to the outside of the second housing.

10. The battery cell assembly according to claim 1, Its features are, The second housing is configured to surround the entire upper, lower, and side surfaces of the battery cell.

11. The battery cell assembly according to claim 1, Its features are, The first housing includes: The first part, configured to cover one side of the electrode assembly; and The second part is configured to cover the other side of the electrode assembly and be coupled to the first part, and The second housing extends to cover the portion where the first part and the second part are joined.

12. The battery cell assembly according to claim 11, Its features are, The extinguishing agent is filled into a portion that combines the first and second portions.

13. The battery cell assembly according to claim 1, Its features are, The extinguishing agent is configured as Novec 1230.

14. A battery module, characterized in that, The battery module includes a battery cell assembly according to any one of claims 1 to 13.

15. A battery pack, characterized in that, The battery pack includes a battery cell assembly according to any one of claims 1 to 13.

16. A vehicle, characterized in that, The vehicle includes a battery cell assembly according to any one of claims 1 to 13.

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