Battery module having fire transfer prevention structure and battery pack including the battery module

Abstract

The present invention relates to a battery module with a fire transfer prevention structure and a battery pack including the battery module, and more particularly, the present invention relates to a battery module with a fire transfer prevention structure and a battery pack including the battery module as follows, the battery module comprising: a module housing; two or more unit modules, the two or more unit modules being received in an internal space of the module housing in a state of being spaced apart from each other by a predetermined distance; and a blocking member, the blocking member being located between the unit modules, the length of the blocking member changing when the blocking member is heated to a predetermined temperature or higher.

Description

Technical Field

[0001] This application claims the benefit of priority from Korean Patent Application No. 2021-0009216, filed on January 22, 2021, the disclosure of which is incorporated herein by reference in its entirety.

[0002] The present invention relates to a battery module having a fire transfer prevention structure and a battery pack including the battery module, and more particularly to: a battery module having a fire transfer prevention structure, wherein a blocking member having a variable length is provided between the battery modules, thereby preventing fire or hot air from being transferred to a unit module adjacent thereto when an event such as a fire occurs in a specific battery module; and a battery pack including the battery module. Background Art

[0003] With the recent development of alternative energy sources due to air pollution and energy depletion caused by the use of fossil fuels, the demand for secondary batteries capable of storing generated electrical energy has increased. Secondary batteries that can be charged and discharged are widely used in daily life. For example, secondary batteries are used in mobile devices, electric vehicles, and hybrid electric vehicles.

[0004] Due to the increasing use and sophistication of mobile devices and the development of electric vehicles, the required capacity of secondary batteries used as energy sources for various electronic devices inevitably used in modern society has increased. To meet user needs, multiple battery cells are being housed in small devices, while battery modules including multiple battery cells electrically connected to each other or battery packs including multiple battery modules are being used in vehicles.

[0005] Meanwhile, when the secondary battery is used in a device requiring large capacity and high output, such as an electric vehicle, the secondary battery is used in the form of a battery module or a battery pack in which a plurality of battery cells are arranged.

[0006] However, when heat is generated while a secondary battery generates electricity and a thermal runaway phenomenon occurs in a specific battery cell due to a short circuit, thermal shock, insulation breakdown, etc., high-temperature gas and fire may occur in the battery cell, causing deformation and damage to adjacent unit cells or battery modules.

[0007] Figure 1 is a perspective view showing a conventional battery module. Figure 1As shown in the figure, the conventional battery module includes: a plurality of stacked battery cells 10; a housing 20 configured to receive the plurality of battery cells 10; and a partition wall 30 disposed between a predetermined number of battery cells 10, the partition wall being provided with a flow path groove in a predetermined area thereof.

[0008] In this conventional battery module, graphite sheets are provided in the flow path grooves, and the graphite sheets are configured to expand when heat is applied. When a predetermined level or more of heat is applied, the graphite sheets expand to block the flow path, thereby isolating adjacent battery cells 10 from each other.

[0009] In this conventional battery module, the provision of partition walls 30 can somewhat prevent damage caused by thermal runaway and fire from being transmitted to adjacent battery cells 10. However, because the partition walls 30 are formed along all side surfaces of the battery cells 10 even in normal conditions, there is a disadvantage of low cooling efficiency.

[0010] (Prior art literature)

[0011] (Patent Document 1) Korean Patent Application Publication No. 2020-0107213 Summary of the Invention

[0012] Technical issues

[0013] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide: a battery module having a fire transfer prevention structure, the fire transfer prevention structure being configured so that the circulation of air between the inside and the outside of the battery module is smoothly achieved in normal times, thereby achieving sufficient cooling efficiency, and when an event such as a fire or gas ventilation occurs, the fire or hot air is blocked from moving to the unit modules adjacent thereto, thereby preventing secondary damage; and a battery pack including the battery module.

[0014] Another object of the present invention is to provide: a battery module having a fire transfer prevention structure, the fire transfer prevention structure being configured so that no temperature sensor is provided and a blocking member having a simple structure is provided, the blocking member being capable of isolating adjacent unit modules from each other only when an event occurs; and a battery pack including the battery module.

[0015] Technical Solution

[0016] To achieve the above-mentioned object, a battery module having a fire transfer prevention structure according to the present invention includes: a module housing (100); two or more unit modules (200), the unit modules (200) being received in an internal space of the module housing (100) in a state of being spaced apart from each other by a predetermined distance; and a blocking member (300), the blocking member (300) being located between the unit modules (200), the length of the blocking member being changed when the blocking member is heated to a predetermined temperature or higher.

[0017] Moreover, in the battery module according to the present invention, the module housing (100) may include an upper housing (110), a side housing (120) and a lower housing (130), and a pair of guide protrusions may be provided on at least one of the lower surface of the upper housing (110) and the upper surface of the lower housing (130), the pair of guide protrusions being spaced apart from each other by a predetermined distance so as to support the blocking member (300).

[0018] Moreover, in the battery module according to the present invention, the blocking member (300) may include: a pair of guide walls (310), the pair of guide walls (310) being spaced apart from each other at a predetermined distance, each of the guide walls having a flat structure; a blocking wall (320), the blocking wall (320) being located in a space between the pair of guide walls (310); an expansion member (330), the expansion member (330) being located near the blocking wall (320); and a pair of auxiliary walls (340), the pair of auxiliary walls (340) being configured to connect opposite ends of the pair of guide walls (310) to each other, and at least one of the pair of auxiliary walls (340) may be made of a material that melts or deforms when heated to a predetermined temperature or higher, so that due to the expansion member (330), the blocking wall (320) protrudes to the outside of the guide wall (310).

[0019] Furthermore, in the battery module according to the present invention, the barrier walls (320) may be provided in a pair so as to be positioned while facing each other in a state where the expansion member (330) is interposed between the barrier walls.

[0020] Furthermore, in the battery module according to the present invention, the pair of auxiliary walls (340) may each be made of a material that melts or deforms when heated to a predetermined temperature or higher.

[0021] Furthermore, in the battery module according to the present invention, the blocking members (300) may be positioned two by two in a state of being spaced apart from each other at a predetermined distance along the side surface of the unit module (200).

[0022] Furthermore, in the battery module according to the present invention, the expansion member (330) may be a coil spring.

[0023] Moreover, in the battery module according to the present invention, the blocking member (300) may include: a pair of guide walls (310), the pair of guide walls (310) are spaced apart from each other at a predetermined distance, each of the guide walls having a flat structure; a pair of blocking walls (320), the pair of blocking walls (320) are located in a space between the pair of guide walls (310), the pair of blocking walls are spaced apart from each other at a predetermined distance; and an expansion member (330), the expansion member (330) is located between the pair of blocking walls (320), the expansion member being configured to cause the blocking wall (320) to protrude to the outside of the guide wall (310) when heated to a predetermined temperature or higher.

[0024] Moreover, in the battery module according to the present invention, the blocking members (300) can be positioned two by two in a state of being spaced apart from each other at a predetermined distance along the side surface of the unit module (200), and the auxiliary wall (340) can be provided at the end of the guide wall (310) of the blocking member (300) positioned to face each other.

[0025] Moreover, in the battery module according to the present invention, the guide wall (310), the blocking wall (320) and the auxiliary wall (340) can all be made of heat-resistant materials, and the expansion member (330) can be made of a shape memory alloy configured to change shape when heated to a predetermined temperature.

[0026] Also, in the battery module according to the present invention, the expansion member (330) may have a coil shape.

[0027] In addition, the present invention provides a battery pack including the battery module.

[0028] Beneficial effects

[0029] It is obvious from the above description that a battery module having a fire transfer prevention structure and a battery pack including the battery module have the advantage that a blocking member is provided, which can prevent fire or hot air from moving to the battery module adjacent thereto only when heated to a predetermined temperature, thereby preventing secondary damage while maintaining the cooling performance of the battery module or battery pack.

[0030] In addition, the battery module having the fire transfer prevention structure and the battery pack including the battery module have advantages in that the blocking member does not include a separate sensor configured to sense fire or gas ventilation, so the structure of the blocking member is simple while its operational reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a perspective view showing a conventional battery module.

[0032] Figure 2 is a perspective view of a battery module according to a first preferred embodiment of the present invention.

[0033] Figure 3 is an exploded perspective view of a battery module according to a first preferred embodiment of the present invention.

[0034] Figure 4 is an exploded perspective view of a blocking member according to a first preferred embodiment of the present invention.

[0035] Figure 5 is a plan view illustrating movement of the barrier wall of the barrier member according to the first preferred embodiment of the present invention when a fire breaks out.

[0036] Figure 6 is an exploded perspective view of a blocking member according to a second preferred embodiment of the present invention.

[0037] Figure 7 is an exploded perspective view of a battery module according to a third preferred embodiment of the present invention.

[0038] Figure 8 is a plan view illustrating movement of a barrier wall of a barrier member according to a third preferred embodiment of the present invention when a fire breaks out.

[0039] Figure 9 1 and 2 are plan views illustrating movement of a barrier wall of a barrier member according to a fourth preferred embodiment of the present invention when a fire breaks out. DETAILED DESCRIPTION

[0040] Now, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the preferred embodiments of the present invention. However, when describing the operating principles of the preferred embodiments of the present invention in detail, when the detailed description of known functions and structures incorporated herein may obscure the subject matter of the present invention, the detailed description of the known functions and structures will be omitted.

[0041] In addition, in all drawings, the same reference numerals will be used to refer to parts that perform similar functions or operations. Throughout the specification, when a part is said to be connected to another part, the part can be directly connected to the other part and the part can also be indirectly connected to the other part via other parts. In addition, the inclusion of a particular element does not mean the exclusion of other elements, but means that such elements may be further included unless otherwise specified.

[0042] Hereinafter, a battery module having a fire transfer prevention structure and a battery pack including the battery module according to the present invention will be described with reference to the accompanying drawings.

[0043] Figure 2 is a perspective view of a battery module according to a first preferred embodiment of the present invention, Figure 3 is an exploded perspective view of a battery module according to a first preferred embodiment of the present invention, and Figure 4 is an exploded perspective view of a blocking member according to a first preferred embodiment of the present invention.

[0044] refer to Figures 2 to 4 , a battery module according to a first preferred embodiment of the present invention includes: a module housing 100; two or more unit modules (monomodule assemblies) 200, the two or more unit modules 200 being received in the module housing 100; and a blocking member 300, the blocking member 300 being located between the unit modules 200.

[0045] First, when describing the module case 100 in detail, the module case 100 configured to enclose the plurality of unit modules 200 includes an upper case 110 , a side case 120 , and a lower case 130 .

[0046] The flat upper housing 110 is positioned above the unit modules 200 and the barrier member 300, thereby protecting the unit modules and the barrier member from external impacts. Preferably, a pair of upper guide protrusions 111 spaced a predetermined distance apart are formed on the lower surface of the upper housing 110 to maintain the barrier member 300 in an upright position. Of course, the upper guide protrusions 111 may be omitted as long as the barrier member 300 can be supported in close contact with the unit modules 200.

[0047] The side case 120 having a substantially flat structure protects side surfaces of the unit module 200 and the blocking member 300 , and the lower case 130 having a flat shape protects lower surfaces of the unit module 200 and the blocking member 300 .

[0048] Here, the lower housing 130 may be provided with a pair of lower guide protrusions 131 on the upper surface thereof, which have the same structure as the upper guide protrusions 111, i.e., a pair of lower guide protrusions 131 spaced apart from each other by a predetermined distance. The lower guide protrusions perform the function of supporting the lower and upper edges of the blocking member 300 together with the upper guide protrusions 111.

[0049] Each unit module 200 includes: a plurality of battery cells 210 stacked side by side in a vertical or horizontal direction; an end plate 220 ; and a bus bar assembly 230 .

[0050] Each battery cell 210 includes: a cell assembly; a cell housing configured to receive the cell assembly; and a pair of leads.

[0051] The cell assembly may be a jelly roll cell assembly having a structure in which a long sheet-type positive electrode and a long sheet-type negative electrode are wound with a separator interposed therebetween; a stacked cell assembly consisting of unit cells having a structure in which a rectangular positive electrode and a rectangular negative electrode are stacked with a separator interposed therebetween; a stacked and folded cell assembly having a structure in which unit cells are wound using a long separator; or a laminated and stacked cell assembly having a structure in which unit cells are stacked with a separator interposed therebetween and then attached to each other. However, the present invention is not limited thereto.

[0052] The cell assembly is housed in a cell housing, which is typically constructed with a laminated sheet structure comprising an inner layer, a metal layer, and an outer layer. The inner layer is placed in direct contact with the cell assembly and should therefore exhibit high insulating properties and high resistance to electrolytic solutions. Furthermore, the inner layer should exhibit high sealability, thereby hermetically sealing the cell housing from the outside. That is, the thermal bond seal between the inner layers should exhibit excellent thermal bond strength. The inner layer can be made of a material selected from the following: polyolefin resins such as polypropylene, polyethylene, polyethylene acrylate, or polybutylene; polyurethane resins; and polyimide resins, which exhibit excellent chemical resistance and high sealability. However, the present invention is not limited thereto, and polypropylene is most preferably used, as it exhibits excellent mechanical and physical properties such as tensile strength, stiffness, surface hardness, and impact resistance, as well as excellent chemical resistance.

[0053] The metal layer disposed adjacent to the inner layer corresponds to a barrier layer configured to prevent moisture or various gases from penetrating into the battery from the outside. A lightweight and easily formable aluminum thin film can be used as a preferred material for the metal layer.

[0054] The outer layer is disposed on the other surface of the metal layer. The outer layer can be made of a heat-resistant polymer exhibiting excellent tensile strength, moisture permeation resistance, and air permeation resistance, so that the outer layer exhibits high heat resistance and chemical resistance while protecting the monomer components. As an example, the outer layer can be made of nylon or polyethylene terephthalate. However, the present invention is not limited to this.

[0055] Meanwhile, the leads including the positive electrode lead and the negative electrode lead are electrically connected to the positive electrode tab and the negative electrode tab of the cell assembly and are exposed outward from the outer case. The battery cell corresponds to a generally known structure, so a more detailed description thereof will be omitted.

[0056] A pair of end plates 220 are located at opposite sides of the plurality of battery cells 210 to fix the battery cells 210 , and an upper plate and / or a lower plate configured to connect the pair of end plates 220 to each other may be further provided as needed.

[0057] The bus bar assembly 230 connects the positive electrode leads and negative electrode leads protruding and extending from the plurality of stacked battery cells 210 in series or in parallel. For bidirectional battery cells 210, the bus bar assembly is provided on each of the front and rear surfaces (X-axis direction) of the unit module 200. For unidirectional battery cells 210, the bus bar assembly is provided on only one of the front and rear surfaces of the unit module.

[0058] In the present invention, the unit module 200 having the bidirectional battery cell 210 received therein will be described by way of example.

[0059] Next, the blocking member 300 will be described. In normal times, the blocking member 300 allows cooling air to freely pass through the unit module 200. However, when an event such as fire or gas draft occurs, the blocking member performs a function of preventing the fire or heat from spreading to the unit module 200 adjacent thereto.

[0060] Specifically, the blocking member 300 is located between two or more unit modules 200 received in the module housing 100, and includes: a pair of guide walls 310, the pair of guide walls 310 being spaced apart from each other at a predetermined distance, each guide wall having a flat structure; a blocking wall 320, the blocking wall 320 being located in the space between the pair of guide walls 310; an expansion member 330, the expansion member 330 being located near the blocking wall 320; and a pair of auxiliary walls 340, the pair of auxiliary walls 340 being configured to connect opposite ends of the pair of guide walls 310 to each other.

[0061] Here, each of the pair of guide walls 310 and the barrier wall 320 is made of a heat-resistant material such as aluminum (Al) or stainless steel so that its shape is maintained even at a high temperature.

[0062] The pair of flat barrier walls 320 are spaced apart from each other by a predetermined distance so as to be movable toward the pair of bus bar assemblies 230. The expansion member 330 is interposed between the barrier walls 320.

[0063] The external shape of the expansion member 330 is not particularly limited as long as the expansion member is compressed at ordinary times and can increase in length when the external force is removed. As an example, the expansion member may be a coil spring.

[0064] Meanwhile, the material for the pair of auxiliary walls 340 is not particularly limited as long as the auxiliary walls can be melted, deformed, or broken when heated by a fire or ventilation gas discharge that breaks out in a specific unit module 200. As an example, polyethylene-based resin, polypropylene-based resin, or polystyrene-based resin may be used.

[0065] Figure 5 is a plan view illustrating movement of the barrier wall of the barrier member according to the first preferred embodiment of the present invention when a fire breaks out.

[0066] When describing the operating principle of the blocking member having the above-mentioned structure, when the battery module operates normally, the blocking member 300 is located between the battery modules adjacent thereto, and more specifically, the length of the expansion member 330 is smaller than the length of the end plate 220 of the battery module (in the X-axis direction) because the expansion member is in a compressed state, thereby allowing cooling air to circulate smoothly.

[0067] However, when a fire breaks out in a particular unit module 200 and the temperature rises, the auxiliary wall 340 melts, deforms, or breaks. At this time, due to the elastic force of the expansion member 330, the blocking wall 320 instantly protrudes to quickly block the unit module 200, thereby preventing the spread of the fire.

[0068] Figure 6 is an exploded perspective view of a blocking member according to a second preferred embodiment of the present invention.

[0069] refer to Figure 6 , except for certain structures of the blocking member 300, the battery module according to the second preferred embodiment of the present invention is different from the reference Figures 2 to 5 The battery modules according to the first preferred embodiment of the present invention are described as being the same, and thus description of the same structures will be omitted.

[0070] The blocking member 300 according to the second preferred embodiment of the present invention is located between two or more unit modules 200 received in the module housing 100, and includes: a pair of guide walls 310, which are spaced apart from each other by a predetermined distance, each guide wall having a flat structure; a pair of blocking walls 320, which are located in the space between the pair of guide walls 310; and an expansion member 330, which is located between the pair of blocking walls 320.

[0071] The expansion member 330 constituting the blocking member 300 according to the second preferred embodiment is made of a material that can change shape when heated to a predetermined temperature or higher, thereby pushing the pair of blocking walls 320 outside the guide wall 310. The material is, for example, a shape memory alloy such as a titanium-nickel alloy, a copper-zinc alloy, or an alloy including at least one of vanadium, chromium, manganese, and cobalt. Preferably, the expansion member has a coil shape.

[0072] Figure 7 is an exploded perspective view of a battery module according to a third preferred embodiment of the present invention, and Figure 8 is a plan view illustrating movement of a barrier wall of a barrier member according to a third preferred embodiment of the present invention when a fire breaks out.

[0073] refer to Figure 7 and Figure 8 , except for certain structures of the upper housing 110, the lower housing 130 and the blocking member 300, the battery module according to the third preferred embodiment of the present invention is different from the reference Figures 2 to 5 The battery module according to the first embodiment described is the same, and thus description of the same structure will be omitted.

[0074] According to the third preferred embodiment of the present invention, the upper shell 110 is provided on its lower surface with a pair of upper guide protrusions 111 spaced apart from each other at a predetermined distance in the lateral direction (X-axis direction), and the lower shell 130 is provided on its upper surface with a pair of lower guide protrusions 131 spaced apart from each other at a predetermined distance.

[0075] The blocking members 300 are positioned two by two in a state of being spaced apart from each other by a predetermined distance along a side surface (X-axis direction) of the unit module 200 .

[0076] Here, each blocking member 300 includes: a pair of guide walls 310; a blocking wall 320; an expansion member 330 composed of a coil spring; and an auxiliary wall 340 configured to connect the opposite ends of the guide walls 310. The auxiliary wall 340, which is in close contact with the blocking wall 320, is made of a material that melts, deforms, or breaks when the temperature rises, and the auxiliary wall 340, the guide wall 310, and the blocking wall 320, which are in close contact with the expansion member 330, are all made of a heat-resistant material.

[0077] Therefore, when a fire breaks out in a specific unit module 200 and the temperature rises, only the auxiliary wall 340 in close contact with the barrier wall 320 melts, deforms, or breaks, whereby the barrier wall 320 protrudes in one direction, ie, toward the bus bar assembly.

[0078] Figure 9 1 and 2 are plan views illustrating movement of a barrier wall of a barrier member according to a fourth preferred embodiment of the present invention when a fire breaks out.

[0079] refer to Figure 9 , except for certain structures of the blocking member 300, the battery module according to the fourth preferred embodiment of the present invention is different from the reference Figure 7 and Figure 8 The battery module according to the third embodiment described is the same, and thus description of the same structure will be omitted.

[0080] In the battery module according to the fourth preferred embodiment of the present invention, the blocking member 300 includes: a pair of guide walls 310; an auxiliary wall 340, which is configured to connect one end of one guide wall 310 and one end of the other guide wall to each other; an expansion member 330, which is made of a shape memory alloy, and the shape memory alloy is configured to change its shape when heated to a predetermined temperature or higher; and a blocking wall 320, which is in close contact with the expansion member.

[0081] Therefore, when a fire breaks out in a particular unit module 200 and the temperature rises, the coil-shaped expansion member 330 expands. At this time, the barrier wall 320 protrudes in one direction, that is, in the direction where the auxiliary wall 340 does not exist, toward the bus bar assembly, thereby isolating the unit modules 200 from each other.

[0082] Those skilled in the art to which the present invention pertains will appreciate that, based on the above description, various applications and modifications are possible within the scope of the present invention.

[0083] Description of Reference Numerals

[0084] 100: Module housing

[0085] 110: Upper shell

[0086] 111: Upper guide protrusion

[0087] 120: Side housing

[0088] 130: Lower shell

[0089] 131: Lower guide protrusion

[0090] 200: Unit module

[0091] 210: Battery cell

[0092] 220: End plate

[0093] 230: Busbar assembly

[0094] 300: blocking member

[0095] 310: Guide Wall

[0096] 320: Blocking Wall

[0097] 330: Expansion member

[0098] 340: Auxiliary wall

Claims

1. A battery module, comprising: Module housing; two or more unit modules received in the inner space of the module housing in a state of being spaced apart from each other by a predetermined distance; and a blocking member located between the unit modules, wherein when the blocking member is heated to a predetermined temperature or higher, a length of the blocking member changes, Wherein, the blocking member comprises: a pair of guide walls spaced apart from each other by a predetermined distance, each of the guide walls having a flat structure; a blocking wall located in a space between the pair of guide walls; an expansion member located adjacent to the barrier wall; and a pair of auxiliary walls configured to connect the opposing ends of the pair of guide walls to each other, and wherein at least one of the pair of auxiliary walls is made of a material that melts or deforms when heated to a predetermined temperature or higher, so that the blocking wall protrudes to the outside of the guide wall due to the expansion member.

2. The battery module according to claim 1, wherein: The module housing includes an upper housing, a side housing and a lower housing, and A pair of guide protrusions are provided on at least one of a lower surface of the upper case and an upper surface of the lower case, and the pair of guide protrusions are spaced apart from each other by a predetermined distance so as to support the blocking member.

3. The battery module according to claim 1, wherein: The barrier walls are provided in a pair so as to be positioned while facing each other in a state in which the expansion member is interposed between the barrier walls.

4. The battery module according to claim 3, wherein: The pair of auxiliary walls are each made of a material that melts or deforms when heated to a predetermined temperature or higher.

5. The battery module according to claim 1, wherein: The blocking members are positioned two by two in a state of being spaced apart from each other by a predetermined distance along a side surface of the unit module.

6. The battery module according to claim 1, wherein: The expansion member is a coil spring.

7. A battery module, comprising: Module housing; two or more unit modules received in the inner space of the module housing in a state of being spaced apart from each other by a predetermined distance; and a blocking member located between the unit modules, wherein when the blocking member is heated to a predetermined temperature or higher, a length of the blocking member changes, Wherein, the blocking member comprises: a pair of guide walls spaced apart from each other by a predetermined distance, each of the guide walls having a flat structure; a pair of blocking walls located in a space between the pair of guide walls, the pair of blocking walls being spaced apart from each other by a predetermined distance; and An expansion member is located between the pair of barrier walls, the expansion member being configured to cause the barrier walls to protrude outside the guide wall when heated to a predetermined temperature or higher.

8. The battery module according to claim 7, wherein: The blocking members are positioned two by two in a state of being spaced apart from each other by a predetermined distance along a side surface of the unit module, and wherein auxiliary walls are provided at ends of the guide walls of the blocking member positioned to face each other.

9. The battery module according to claim 8, wherein: The guide wall, the blocking wall and the auxiliary wall are all made of heat-resistant material, and Wherein, the expansion member is made of a shape memory alloy configured to change shape when heated to a predetermined temperature.

10. The battery module according to claim 9, wherein: The expansion member has a coil shape.

11. A battery pack comprising the battery module according to any one of claims 1 to 10.

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