Battery module

Abstract

A battery module according to one embodiment of the present application can include a plurality of secondary battery cells, and a case unit forming an internal space to accommodate the plurality of secondary battery cells, and provided with a plate member extending a flame and gas path.

Description

TECHNICAL FIELD

[0001] The present application relates to a battery module. BACKGROUND

[0002] As the development and demand for mobile devices, electric vehicles, and the like technology increases, the demand for secondary battery cells as an energy source is rapidly increasing. Since the mutual conversion between chemical energy and electrical energy of the secondary battery cell is reversible, the secondary battery cell is a battery that can be repeatedly charged and discharged.

[0003] The secondary battery cell includes an electrode assembly such as an anode, a cathode, a separator, and an electrolyte as a main component of a secondary battery, and a battery cell main part of a multi-layer outer material (Laminated Film Case) that protects the electrode assembly.

[0004] In addition, a plurality of the secondary battery cells are installed as a battery module in an electric vehicle, an energy storage system (ESS), or the like.

[0005] However, the electrode assembly generates heat during charging and discharging, and the temperature rise due to such heat can reduce the performance of the secondary battery cell.

[0006] In addition, any one of the secondary battery cells explodes due to an internal factor of the battery module such as a temperature rise of the secondary battery cell, or any one of the secondary battery cells explodes due to an external impact, and can cause the secondary battery cells within the battery module to continuously explode.

[0007] In addition, the explosion of any one of the secondary battery cells causes thermal propagation, flame, or high-temperature, high-pressure gas, and the like to act on other battery modules around, which can cause a greater problem in that the battery modules continuously explode.

[0008] Therefore, in order to improve the above problems and limitations, research on the battery module is required.

[0009] PRIOR ART DOCUMENT

[0010] PATENT DOCUMENT

[0011] (Patent Document 1) KR 10-2017-0014309 A (2017.02.08) SUMMARY

[0012] (I) Problem to be Solved

[0013] The present application aims to provide a battery module that improves the problem in which other battery modules around continuously explode due to the explosion of any one of the battery modules.

[0014] In another aspect, the present application aims to provide a battery module that dissipates a flame generated due to explosion of any one battery module.

[0015] (II) Technical Solution

[0016] A battery module according to one embodiment of the present application can include a plurality of secondary battery cells, and a housing unit forming an internal space in which the plurality of secondary battery cells are accommodated, and provided with a plate member extending a flame and gas path.

[0017] Specifically, the plate member of the battery module according to one embodiment of the present application can include a first plate portion disposed at one side, a second plate portion disposed at a predetermined distance apart from the first plate portion to form a hollow portion between the second plate portion and the first plate portion, and a core portion disposed in the hollow portion and forming a flame and gas path.

[0018] In this regard, the battery module according to one embodiment of the present application can be characterized in that the core portion can be formed in a pattern in which unit column portions in a polygonal column shape with an inner hollow are repeated.

[0019] Also, the battery module according to one embodiment of the present application can be characterized in that the unit column portion can form a communication portion on at least two column surfaces thereof.

[0020] In addition, the battery module according to one embodiment of the present application can be characterized in that the unit column portion can form the flame and gas path in a Z shape through a first communication portion formed adjacent to the first plate portion and a second communication portion formed adjacent to the second plate portion.

[0021] Also, the battery module according to one embodiment of the present application can be characterized in that the second plate portion can form an entry portion that communicates the internal space in which the secondary battery cells are accommodated and the hollow portion.

[0022] Further, the plate member of the battery module according to one embodiment of the present application can include an opening and closing plate portion connected to the second plate portion and opening or closing the entry portion.

[0023] In this regard, the battery module according to one embodiment of the present application can be characterized in that the opening and closing plate portion can be formed to be damaged by heat or pressure generated due to explosion of any one of the secondary battery cells.

[0024] In another aspect, the battery module according to one embodiment of the present application can be characterized in that one end portion of the opening and closing plate portion can be hingedly coupled to the second plate portion to be rotated in the direction of the hollow portion by pressure generated due to explosion of any one of the secondary battery cells and open the entry portion.

[0025] Further, the plate member of the battery module according to one embodiment of the present application can include a receiving member received in the hollow portion, and the receiving member is formed of a material performing at least one of an extinguishment function, a heat absorption function, and a fire resistance function.

[0026] Also, the battery module according to one embodiment of the present application is characterized in that the first plate portion can be formed with a discharge portion discharging a flame or gas entering the hollow portion to an outside of the hollow portion.

[0027] In addition, the battery module according to one embodiment of the present application is characterized in that the housing unit can include a bottom portion on which a plurality of the secondary battery units are seated, a side wall portion provided at an edge of the bottom portion, and a cover portion provided at an upper end of the side wall portion, and the plate member is provided in at least one of the bottom portion, the side wall portion, and the cover portion.

[0028] Further, the battery module according to one embodiment of the present application is characterized in that the housing unit includes a partition portion provided in the internal space to divide the internal space, and the plate member is provided in the partition portion.

[0029] The battery module of the present application can improve a problem in which other battery modules around a certain battery module continuously explode due to explosion of the certain battery module.

[0030] That is, the battery module of the present application can prevent thermal propagation to other battery modules in case of thermal runaway of a certain battery module.

[0031] On the other hand, the battery module of the present application can dissipate a flame generated due to explosion of a certain battery module.

[0032] On the other hand, the battery module of the present application can ensure structural rigidity and achieve light weight in an environment of impact, vibration, etc.

[0033] However, various advantageous advantages and effects of the present application are not limited to the above, and will be more easily understood in the course of describing specific embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is an exploded perspective view showing the battery module of the present application.

[0035] Figure 2This is a perspective view showing a portion of the first plate portion of the plate component disposed in the housing unit of the battery module of the present invention.

[0036] Figure 3 This is a perspective view showing a portion of the first plate portion of the plate component disposed in the bottom component and side wall component of the battery module of the present invention.

[0037] Figure 4 This is a perspective view showing a portion of the first plate portion of the plate member of the cover member of the housing unit in the battery module of the present invention.

[0038] Figure 5 This is a perspective view showing a unit column portion of the core in the battery module of the present invention.

[0039] Figure 6 This is a side sectional view showing the plate component of the battery module of the present invention disposed on the side wall component.

[0040] Figure 7 This is a side sectional view showing an embodiment in which the opening and closing plate portion of the plate component in the battery module of the present invention is configured to be damaged by heat or pressure generated by the explosion of the secondary battery cell.

[0041] Figure 8 This is a side sectional view showing an embodiment in which the opening and closing plate portion of the plate component in the battery module of the present invention is configured to rotate under the pressure generated by the explosion of the secondary battery cell.

[0042] Figure 9 This is a main sectional view showing an embodiment of the battery module of the present invention in which a receiving component is provided in a plate component.

[0043] Figure 10 This is a perspective view showing an embodiment of the battery module of the present invention in which a separator component is provided in the housing unit.

[0044] Explanation of reference numerals in the attached figures

[0045] 100: Secondary battery unit; 200: Housing unit

[0046] 210: Plate component 211: First plate component

[0047] 212: Second board section 213: Core section

[0048] 214: Opening / closing plate section; 220: Receiving component Detailed Implementation

[0049] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. However, embodiments of the present invention can be modified in various ways, and the scope of the present invention is not limited to the embodiments described below. Furthermore, the embodiments of the present invention are provided to provide a more complete description of the present invention to those skilled in the art. To more clearly describe the present invention, the shape and dimensions of components may be shown in enlarged form in the accompanying drawings.

[0050] Furthermore, unless otherwise expressly stated in the context, singular expressions in this specification include plural expressions, and throughout the specification, the same or similar reference numerals denote the same components or corresponding components.

[0051] This invention relates to a battery module that can mitigate the problem of a chain reaction of explosions in surrounding battery modules caused by the explosion of any one battery module. Specifically, it prevents thermal propagation to other battery modules in the event of thermal runaway in any one battery module.

[0052] On the other hand, the battery module of the present invention can dissipate flames caused by the explosion of any battery module, and can ensure structural rigidity and achieve lightweighting under impact, vibration and other environments.

[0053] Specifically, refer to the attached diagram. Figure 1 This is an exploded perspective view showing the battery module of the present invention. Figure 2 This is a perspective view showing a portion of the first plate portion 211 of the plate member 210 disposed in the housing unit 200 of the battery module of the present invention.

[0054] also, Figure 3 This is a perspective view showing a portion of the first plate portion 211 of the plate member 210 disposed in the bottom member 200a and side wall member 200b of the housing unit 200 in the battery module of the present invention. Figure 4 This is a perspective view showing a portion of the first plate portion 211 of the plate member 210 of the cover member 200c provided in the housing unit 200 of the battery module of the present invention.

[0055] Referring to the above figures, a battery module according to an embodiment of the present invention may include: a plurality of secondary battery units 100; and a housing unit 200 forming an internal space R for accommodating the plurality of secondary battery units 100, and having a plate member 210 extending the flame and gas path F.

[0056] As described above, the battery module of the present invention is configured to extend the path of the flame generated by the secondary battery unit 100 disposed in the internal space R, thereby dissipating the flame.

[0057] That is, in the battery module of the present invention, since the flame is dissipated before being discharged to the outside, the problem of flame propagation to other adjacent battery modules and causing continuous explosions can be prevented.

[0058] The flame dissipates because the flame temperature decreases due to the extension of the path and the depletion of oxygen, resulting in a lack of conditions to sustain the flame.

[0059] Multiple secondary battery units 100 can be accommodated in the internal space R of the housing unit 200.

[0060] In addition, the secondary battery unit 100 may include an electrode assembly and a battery unit body component covering the electrode assembly.

[0061] In practice, the electrode assembly includes an electrolyte and is used together within the main body of the battery cell. The electrolyte may contain lithium salts such as LiPF6 or LiBF4 in organic solvents such as ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), or dimethyl carbonate (DMC). Furthermore, the electrolyte may be liquid, solid, or gel-like.

[0062] Furthermore, the battery cell body component is a structure that protects the electrode assembly and contains the electrolyte. For example, the battery cell body component can be configured as a pouch-type component or a can-type component. The pouch-type component has a shape that seals and contains the electrode assembly on three sides, and it is typically configured to fold and seal the upper and side faces (excluding the bottom face) while containing the electrode assembly internally. Similarly, the can-type component has a shape that seals and contains the electrode assembly on one side, and it is typically configured to fold and seal the upper face (excluding the bottom and side faces) while containing the electrode assembly internally.

[0063] However, the pouch-type secondary battery unit 100 and the can-type secondary battery unit 100 are merely examples of secondary battery units 100 housed in the battery module of the present invention, and the secondary battery units 100 housed in the battery module of the present invention are not limited to the above types.

[0064] The housing unit serves as the main body for accommodating the battery module containing the multiple secondary battery units 100.

[0065] That is, the housing unit is a structure for installing multiple secondary battery units, and is used to transfer the electrical energy generated by the secondary battery units to the outside or transfer electrical energy from the outside to the secondary battery units while protecting the secondary battery units.

[0066] Therefore, the housing unit may include a bottom component 200a, a side wall component 200b, a cover component 200c, etc., for forming an internal space R that accommodates a plurality of the secondary battery units 100. Plate components 210 extending the flame and gas path F may be provided in such bottom component 200a, side wall component 200b, cover component 200c, etc.

[0067] Therefore, the ratio of flames generated by an explosion of the secondary battery unit 100 housed in the internal space R of the housing unit to the outside can be reduced by the bottom component 200a, side wall component 200b, cover component 200c, etc. By reducing the ratio of flames to the outside of the housing unit, the problem of flames spreading to adjacent battery modules and causing continuous explosions can be mitigated.

[0068] Specifically, according to an embodiment of the present invention, the plate component 210 of the battery module may include: a first plate portion 211 disposed on one side; a second plate portion 212 disposed at a predetermined distance from the first plate portion 211 to form a hollow portion H between the second plate portion and the first plate portion 211; and a core portion 213 disposed in the hollow portion H and forming a flame and gas path F.

[0069] That is, the bottom component 200a, the side wall component 200b and the cover component 200c can be formed by the plate component 210 itself, and the plate component 210 can include a first plate portion 211, a second plate portion 212 and a core portion 213.

[0070] For example, when the sidewall component 200b is formed from the plate component 210, the first plate portion 211 can be disposed on one side and exposed to the outside, and the second plate portion 212 can be disposed closer to the inner side of the secondary battery unit 100 than the first plate portion 211. That is, at least a portion of both ends of the second plate portion 212 is coupled to the first plate portion 211, the center portion is disposed at a predetermined distance from the first plate portion 211, and is disposed closer to the secondary battery unit 100 than the first plate portion 211.

[0071] Furthermore, the core portion 213 can be disposed in the hollow portion H formed by the first plate portion 211 and the second plate portion 212 being arranged at a predetermined distance apart. Additionally, the core portion 213 can be configured to extend the path of the flame into the hollow portion H.

[0072] That is, the battery module according to an embodiment of the present invention is characterized in that the core 213 is formed as a repeating pattern of unit column portions 213a in the form of hollow polygonal columns.

[0073] As described above, the core 213 is formed by a plurality of the unit columns 213a, and the flame moves while passing through the unit columns 213a, thus increasing the flame and gas path F.

[0074] For example, the flame and gas path can be extended by forming a connecting portion 213b in the unit column portion 213a, as will be referred to later. Figure 5 Please provide a detailed explanation.

[0075] Furthermore, an entry portion 212a may be formed in the second plate portion 212, allowing a flame to enter the hollow portion H, and an exit portion 211a may be formed in the first plate portion 211, allowing the flame, gas, etc., that have entered the hollow portion H to be discharged. This will be discussed later. Figure 6 Please provide a detailed explanation.

[0076] Furthermore, the core 213 is disposed in the hollow portion H between the first plate portion 211 and the second plate portion 212, thereby also serving to support the first plate portion 211 and the second plate portion 212. Therefore, the plate component 210 can ensure structural rigidity and achieve lightweighting under impact, vibration, and other environments.

[0077] The housing unit is provided with a plate component 210 extending the flame and gas path F, and may include a bottom component 200a, a side wall component 200b, and a cover component 200c for forming an internal space R for accommodating a plurality of the secondary battery units 100.

[0078] That is, the battery module according to an embodiment of the present invention is characterized in that the housing unit 200 includes: a bottom component 200a on which a plurality of the secondary battery units 100 are disposed; a side wall component 200b disposed at the edge of the bottom component 200a; and a cover component 200c disposed at the upper end of the side wall component 200b, wherein the plate component 210 is disposed in at least one of the bottom component 200a, the side wall component 200b and the cover component 200c.

[0079] The bottom component 200a is on which the plurality of secondary battery units 100 are mounted, and the bottom component 200a serves to support the plurality of secondary battery units 100.

[0080] The bottom component 200a can be configured to transfer the heat generated by the secondary battery unit 100 to an external heat sink for cooling.

[0081] In addition, the side wall component 200b forming the side of the housing unit can also dissipate the heat generated by the secondary battery unit 100 to the outside.

[0082] The housing unit may include a cover member 200c disposed at the upper end of the side wall member 200b to protect the upper end of the secondary battery unit. Additionally, the housing unit may include a front member and a rear member adjacent to the side wall member 200b, and thus can be configured to cover a plurality of the secondary battery units 100.

[0083] In addition, the housing unit may also be provided with additional structures such as a busbar component for connecting the secondary battery unit to an external power source.

[0084] In addition, the inner surface of the side wall component 200b is provided with a compression component, which can further securely protect the secondary battery unit 100.

[0085] Furthermore, at least one of the bottom component 200a, side wall component 200b, and cover component 200c is provided with a plate component 210 extending the flame and gas path F, thereby guiding the dissipation of the flame. Therefore, the problem of continuous explosions caused by the flame generated by any one battery module spreading to adjacent battery modules can be mitigated.

[0086] Figure 5 This is a perspective view showing the unit column portion 213a of the core portion 213 of the battery module of the present invention, with reference to... Figure 5 According to an embodiment of the present invention, the battery module is characterized in that the unit column 213a forms a connecting portion 213b on at least two of its column surfaces.

[0087] Therefore, the flame, gas, etc. flowing into the unit column 213a of the core 213 can be transferred again to other adjacent unit columns 213a. Thus, the flow path of the flame, gas, etc. entering the core 213 can be extended.

[0088] Furthermore, a battery module according to an embodiment of the present invention is characterized in that the unit column portion 213a forms the flame and gas path in a Z shape through a first connecting portion 213c formed adjacent to the first plate portion 211 and a second connecting portion 213d formed adjacent to the second plate portion 212.

[0089] When the connecting portion 213b is formed in the above shape, the flow path of the flame, gas, etc., can be further extended, and an indirect cooling effect can also be obtained. Therefore, the flame dissipation effect can be improved, and lower temperature gas can be formed.

[0090] For example, flames, gases, etc. enter the unit column 213a through the first connecting part 213c, and flames, gases, etc. are discharged to other adjacent unit columns 213a through the second connecting part 213d, thereby extending the flow path of flames, gases, etc.

[0091] Furthermore, if the first connecting portion 213c is a hole formed adjacent to the first plate portion 211, and the second connecting portion 213d is a hole formed adjacent to the second plate portion 212, then the flame, gas, etc., not only pass through the unit column portion 213a on a plane horizontal to the first plate portion 211 or the second plate portion 211, but also ensure a flow path in a direction intersecting the plane. Therefore, the flow path of the flame, gas, etc. can be further extended by a Z-shape.

[0092] In addition, when the first plate portion 211 or the second plate portion 212 is arranged close to the outer side where the temperature is lower, the flame, gas, etc. passing through the first connecting portion 213c or the second connecting portion 213d can also be cooled.

[0093] Figure 6 This is a side sectional view showing the plate member 210 of the battery module of the present invention disposed in the side wall member 200b, with reference to... Figure 6 According to an embodiment of the present invention, the battery module is characterized in that the second plate portion 212 is formed with an entry portion 212a that communicates the internal space R of the secondary battery unit 100 and the hollow portion H.

[0094] Therefore, the flame generated by the secondary battery unit 100 housed in the internal space R can enter the hollow portion H of the plate member 210. Thus, the flow path of the flame, gas, etc., can be extended through the core 213 disposed in the hollow portion H.

[0095] The entry section 212a may be further provided with an opening / closing plate section 214 for opening or closing the entry section 212a, which will be referred to later. Figure 7 Please provide a detailed explanation.

[0096] Furthermore, a battery module according to an embodiment of the present invention is characterized in that the first plate portion 211 is formed with an exhaust portion 211a for discharging flames or gases entering the hollow portion H to the outside of the hollow portion H.

[0097] Therefore, a portion of the flame or gas that has not yet dissipated in the flame that enters the hollow part H can be discharged through the discharge part 211a.

[0098] Furthermore, when the first plate portion 211 is configured to contact the outside, if the secondary battery unit 100 housed in the internal space R of the housing unit 200 explodes and creates a high-pressure environment, the outside environment is relatively low-pressure. Therefore, high-pressure gases in the internal space R can be guided to move to the low-pressure outside through the plate portion 210. Therefore, flames generated in the internal space R can also be guided through the plate portion 210.

[0099] Figure 7 This is a side sectional view showing an embodiment in which the opening / closing plate portion 214 of the plate component 210 in the battery module of the present invention is configured to be damaged by heat or pressure generated by the explosion of the secondary battery unit 100, with reference to Figure 7 According to an embodiment of the present invention, the plate component 210 of the battery module may include an opening and closing plate portion 214, which is connected to the second plate portion 212 and opens or closes the inlet portion 212a.

[0100] The opening and closing plate portion 214, as described above, can prevent external foreign objects from flowing back through the plate component 210 and entering the internal space R.

[0101] In addition, the opening and closing plate 214 needs to open the entry 212a when the secondary battery unit 100 explodes, so as to guide the flames, gases and the like generated when the secondary battery unit 100 explodes and is contained in the internal space R to the plate component 210.

[0102] Therefore, a battery module according to an embodiment of the present invention is characterized in that the opening and closing plate portion 214 is formed to be damaged by heat or pressure generated by the explosion of any of the secondary battery cells 100.

[0103] In other words, the opening / closing plate 214 is melted and damaged by the heat generated by the explosion of the secondary battery unit 100 to open the entry part 212a, or it is cracked and damaged by the high-pressure gas generated by the explosion of the secondary battery unit 100 to open the entry part 212a.

[0104] For example, such as Figure 7 As shown, a groove is formed in a portion of the opening / closing plate portion 214, making it more vulnerable to high-pressure gas compared to other portions.

[0105] Alternatively, the opening and closing plate 214 can also be configured as a door that can be opened and closed, as will be referred to Figure 8 Please provide a detailed explanation.

[0106] Figure 8 This is a side sectional view showing an embodiment in which the opening / closing plate portion 214 of the plate component 210 in the battery module of the present invention is configured to rotate under the pressure generated by the explosion of the secondary battery cell 100, with reference to... Figure 8 According to an embodiment of the present invention, the battery module is characterized in that one end of the opening and closing plate portion 214 is hinged to the second plate portion 212 so as to rotate in the direction of the hollow portion H and open the entry portion 212a by the pressure generated by the explosion of any of the secondary battery units 100.

[0107] That is, the opening and closing plate portion 214 can be configured to be damaged by the heat or pressure generated by the explosion of the secondary battery unit 100 to open the entry portion 212a, and can also be configured as a door to open the entry portion 212a.

[0108] For this purpose, the opening / closing plate portion 214 can be configured such that one end is hinged to the second plate portion 212 for rotation, and an elastic member can be connected to one end, the elastic member providing a predetermined elastic force in the direction of closing the entry portion 212a.

[0109] Therefore, when the secondary battery unit 100 housed in the internal space R explodes, causing the internal space R to become a high-pressure environment, the opening and closing plate portion 214 can rotate in the direction of opening the entry portion 212a to open the entry portion 212a.

[0110] Figure 9 This is a main sectional view showing an embodiment of the battery module of the present invention in which a receiving member 220 is provided in the plate member 210, with reference to Figure 9 According to an embodiment of the present invention, the plate component 210 of the battery module may include a receiving component 220, the receiving component 220 being housed in the hollow portion H, and the receiving component 220 being formed of a material performing at least one of the functions of extinguishing, absorbing heat, and resisting fire.

[0111] Therefore, when the first plate portion 211 or the second plate portion 212, which is arranged adjacent to the internal space R, is melted by heat or flame, the receiving component 220 can directly contact heat or flame and perform at least one of the functions of fire extinguishing, heat absorption, and fire resistance.

[0112] Figure 10 This is a perspective view showing an embodiment of the battery module of the present invention in which a separator component 200d is provided in the housing unit 200, with reference to... Figure 10According to an embodiment of the present invention, the battery module is characterized in that the housing unit 200 includes a separator component 200d, the separator component 200d being disposed in the internal space R to divide the internal space R, and the plate component 210 being disposed on the separator component 200d.

[0113] That is, the partition component 200d can also be provided in the internal space R of the housing unit 200 to prevent the explosion of the secondary battery unit 100 that occurs on one side from being transferred to the other side.

[0114] For example, such as Figure 10 As shown, the partition component 200d is provided in the central part of the internal space R to divide the internal space R into two spaces.

[0115] This can improve the problem of the secondary battery unit 100, which is located in the internal space R on one side, being transferred to the secondary battery unit 100 located in the internal space R on the other side.

[0116] The embodiments of the present invention have been described above, but the scope of the present invention is not limited thereto. Various modifications and changes can be made without departing from the technical concept of the present invention as set forth in the claims, which will be obvious to those skilled in the art.

Claims

1. A battery module comprising: a plurality of secondary battery cells; and a housing unit forming an internal space in which the plurality of secondary battery cells are accommodated, and provided with a plate member extending a flame and gas path, the plate member including: a first plate portion disposed on one side; a second plate portion disposed at a predetermined distance apart from the first plate portion to form a hollow portion between the second plate portion and the first plate portion; and a core portion disposed in the hollow portion and forming a flame and gas path, the core portion including a unit column portion in a polygonal column shape, the unit column portion including a communication portion passing through at least a portion of a column face of the unit column portion, the flame and gas flowing along a direction perpendicular to a thickness direction of the plate member through the communication portion. 2.The battery module according to claim 1, wherein the core portion is formed in a pattern in which the unit column portion is repeated. 3.The battery module according to claim 2, wherein the unit column portion includes a hollow polygonal column, and the communication portion is formed on at least two column faces of the unit column portion. 4.The battery module according to claim 2, wherein the unit column portion forms the flame and gas path in a Z shape through a first communication portion formed adjacent to the first plate portion and a second communication portion formed adjacent to the second plate portion. 5.The battery module according to claim 1, wherein the second plate portion is formed with an entrance portion communicating the internal space in which the secondary battery cells are accommodated and the hollow portion. 6.The battery module according to claim 5, wherein the plate member includes an opening and closing plate portion connected to the second plate portion and opening or closing the entrance portion. 7.The battery module according to claim 6, wherein the opening and closing plate portion is formed to be damaged by heat or pressure generated by explosion of any one of the secondary battery cells. 8.The battery module according to claim 6, wherein one end portion of the opening and closing plate portion is hingedly coupled to the second plate portion to be rotated in the direction of the hollow portion by pressure generated by explosion of any one of the secondary battery cells and open the entrance portion. 9.The battery module according to claim 1, wherein the plate member includes an accommodation member accommodated in the hollow portion, and the accommodation member is formed of a material performing at least one of a fire extinguishing function, a heat absorbing function, and a fire resistant function. 10.The battery module according to claim 1, wherein the first plate portion is formed with a discharge portion discharging the flame or gas entering the hollow portion to an outside of the hollow portion. 11.The battery module according to claim 1, wherein the housing unit includes: a bottom member on which the plurality of secondary battery cells are seated; a side wall member provided at an edge of the bottom member; and a cover member provided at an upper end of the side wall member, the plate member is provided in at least one of the bottom member, the side wall member, and the cover member.

12. The battery module according to claim 1, characterized by the housing unit includes a partition member configured in the internal space to divide the internal space, the plate member is provided at the partition member.

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