Battery pack and vehicle including the same

Abstract

A battery pack and a vehicle including the same are disclosed. A battery pack according to an embodiment of the present invention comprises: a plurality of battery cells; a pack case in which the plurality of battery cells are stored and in which a venting portion is formed; and a sealing member mounted on the pack case to seal the pack case and close the exhaust portion, in which the sealing member breaks under a pressure within a preset range such that a flame or gas generated within the pack case can be exhausted through the exhaust portion.

Description

Technical Field

[0001] This application claims priority to Korean Patent Application No. 10-2022-0181863 filed in Korea on December 22, 2022, and Korean Patent Application No. 10-2023-0177850 filed in Korea on December 8, 2023, the disclosures of which are incorporated herein by reference.

[0002] The present disclosure relates to a battery pack and a vehicle including the battery pack, and more particularly, to a battery pack capable of directionally discharging flame or gas and a vehicle including the battery pack. Background Art

[0003] Generally, a secondary battery refers to a battery that can be repeatedly charged and discharged (such as a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydrogen battery, a nickel zinc battery, etc.) A battery cell as the most basic secondary battery can provide an output voltage of about 2.5V to 4.2V.

[0004] Recently, secondary batteries have been applied to devices requiring high output voltage and large charging capacity such as electric vehicles or ESS (energy storage system), and therefore, battery packs have been widely used, which are manufactured in a manner of configuring battery modules by connecting a plurality of battery cells in series, in parallel, or in combination and reconnecting these battery modules in series, in parallel, or in combination.

[0005] Although lithium secondary batteries have attracted much attention due to their advantages such as high operating voltage and significantly high energy density, since lithium secondary batteries use organic electrolytes, overcharging of lithium secondary batteries may lead to overcurrent and overheating, which may cause explosions or fires in severe cases. In other words, if a thermal event occurs inside the secondary battery, the internal pressure may increase sharply, resulting in explosions or fires.

[0006] If a fire occurs in at least one of the battery cells disposed inside a housing in the battery pack, and if the fire spreads outside the housing, a user may be in a dangerous condition.

[0007] For example, if a fire occurs in a battery cell in a state where the battery pack is mounted to an electric vehicle and if the fire spreads to the outside, a driver of the electric vehicle may be burned or put in a dangerous situation.

[0008] Therefore, directional exhaust for controlling the exhaust direction of high-temperature gas or flame generated from each battery cell in a predetermined direction has become increasingly important.

[0009] However, it is not easy to adjust the position of the exhaust portion through which high-temperature gas or flame is discharged in the directional exhaust to a position desired by a designer, and providing a separate exhaust device leads to an increase in cost. Summary of the invention

[0010] Technical issues

[0011] The present disclosure is designed to solve the problems of the prior art, and therefore, the present disclosure aims to provide a battery pack and a vehicle including the battery pack, which can discharge flames or gases generated by ignition in battery cells in a predetermined direction without a separate exhaust device (directional discharge).

[0012] In addition, the present disclosure provides a battery pack capable of freely adjusting a discharge position of flame or gas, and a vehicle including the battery pack.

[0013] Furthermore, the present disclosure provides a battery pack capable of adjusting a size and a number of exhaust portions through which flame or gas is exhausted, and a vehicle including the same.

[0014] However, the technical problems that the present disclosure attempts to solve are not limited to the above problems, and other problems not mentioned above will be clearly understood by those skilled in the art from the specification of the present invention described below.

[0015] Technical Solution

[0016] According to one aspect of the present disclosure, a battery pack is provided, comprising: a plurality of battery cells; a battery pack housing configured to store the plurality of battery cells and having a vent portion formed on the battery pack housing; and a sealing member mounted to the battery pack housing to seal the battery pack housing and configured to close the vent portion; wherein the sealing member is ruptured due to a pressure within a predetermined range, so that flames or gases generated inside the battery pack housing are discharged through the vent portion.

[0017] In an embodiment, the vent portion may be provided as a recessed portion formed to be recessed on the pack case, and the sealing member may be provided across the recessed portion.

[0018] In an embodiment, the sealing member may traverse the recess to divide the recess into an outer side and an inner side, and the outer side of the recess and the inner side of the recess may have different areas.

[0019] In an embodiment, an area of ​​an inner side of the recess may be larger than an area of ​​an outer side of the recess.

[0020] In an embodiment, the inside of the recess may be open to a portion where flame or gas is expected to be generated, and the outside of the recess may be open to the outside.

[0021] In an embodiment, the recess may be formed in a rectangular shape, and the sealing member may be disposed perpendicular to some edges of the recess.

[0022] In the embodiment, an insertion groove into which the sealing member is inserted may be formed in the battery pack case, and the insertion groove and the recess may communicate with each other.

[0023] In an embodiment, the insertion groove may be formed along an inner circumference of the battery pack case, and the recess may be formed on at least one of the portions where the insertion groove is formed so as to communicate with the insertion groove.

[0024] In an embodiment, a breakable portion may be formed on the sealing member to facilitate breaking when flame or gas is generated.

[0025] In the embodiment, the easily breakable portion may be provided as a cutout portion formed to be thinner than other portions of the sealing member.

[0026] In an embodiment, the notch portion may be provided inside the exhaust portion.

[0027] In an embodiment, the sealing member may be made of ethylene propylene diene monomer (EPDM).

[0028] Meanwhile, a vehicle including the above-mentioned battery pack may be provided.

[0029] Beneficial Effects

[0030] The embodiments of the present disclosure have the effect of exhausting flames or gases generated by ignition in a battery cell in a predetermined direction without a separate exhaust device (directional exhaust).

[0031] Furthermore, the embodiment of the present disclosure has an effect of freely adjusting the exhaust position of flame or gas.

[0032] Furthermore, the embodiments of the present disclosure have the effect of adjusting the size and number of exhaust portions through which flames or gases are exhausted.

[0033] However, effects obtainable according to the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned above will be clearly understood by those skilled in the art from the specification of the present invention described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the detailed description of the present invention, are used to provide further understanding of the technical idea of ​​the present disclosure; therefore, the present disclosure is not to be construed as being limited to the accompanying drawings.

[0035] Figure 1 is a perspective view of a battery pack according to an embodiment of the present disclosure.

[0036] Figure 2 is along Figure 1 Figure viewed from the direction of arrow B.

[0037] Figure 3 yes Figure 1 A partially exploded perspective view of the .

[0038] Figure 4 It is shown installed on Figure 3 FIG. 1 is a diagram of a sealing member of a battery pack housing.

[0039] Figure 5 yes Figure 4 Magnified view of part C.

[0040] Figure 6 It is shown Figure 5 A diagram showing a state in which the sealing member is broken.

[0041] Figure 7 is along Figure 1 Cross-sectional view along line A-A'.

[0042] Figure 8 is a diagram illustrating a vehicle including a battery pack according to various embodiments of the present disclosure. DETAILED DESCRIPTION

[0043] Hereinafter, the preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be understood that the terms used in the specification and the appended claims should not be interpreted as limited to the general and dictionary meanings, but should be interpreted based on the meanings and concepts corresponding to the technical solutions of the present disclosure on the basis of the principle that the inventor is allowed to appropriately define the terms to obtain the best interpretation. Therefore, the configurations proposed in the embodiments of this specification and the accompanying drawings only represent the most preferred embodiments of the present disclosure and do not represent the entire technical ideas of the present disclosure, so it should be understood that various equivalents and modifications may be made to them when applying.

[0044] For ease of explanation and clarification, the size of each element shown in the drawings or the size of a specific part of each element is exaggerated, omitted or simplified. Therefore, the size of each element does not fully reflect their actual size. The description of related known functions or configurations that may obscure the subject matter of the present disclosure will be omitted.

[0045] The expression “an element is 'coupled' or 'connected' to another element” should be understood that the elements may be directly coupled or connected to each other, and the elements may also be indirectly coupled or connected to each other through a connecting member.

[0046] Figure 1 is a perspective view of a battery pack according to an embodiment of the present disclosure, Figure 2 is along Figure 1 The figure is viewed from the direction of arrow B. Figure 3yes Figure 1 A partial exploded perspective view of Figure 4 It is shown installed on Figure 3 FIG. 1 is a diagram of a sealing member of a battery pack housing, Figure 5 yes Figure 4 The enlarged view of part C of Figure 6 It is shown Figure 5 FIG. 1 shows a state where the sealing member is broken. Figure 7 is along Figure 1 Cross-sectional view along line A-A'.

[0047] 1 , a battery pack 10 according to an embodiment of the present disclosure may include a plurality of battery cells 100 , a pack case 200 , and a sealing member 300 .

[0048] The battery cell 100 may be configured in various ways and may include, for example, a cylindrical battery cell, a square battery cell, or a pouch-type battery cell. Figure 7 As shown, the following description is based on the case where the cylindrical battery cells are stored inside the battery pack case 200. However, the battery cell 100 is not limited to the cylindrical battery cell. Figure 7 A plurality of cylindrical battery cells are stored inside the battery pack housing 200 .

[0049] A cylindrical battery cell may include an electrode assembly, a battery can, and a cap plate.

[0050] The electrode assembly has a structure in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate are wound in one direction. In addition, the electrode assembly may be formed in a core-wound type having a central hole formed at the center thereof.

[0051] For example, the electrode assembly may be manufactured by winding a laminate formed by sequentially stacking a negative electrode plate, a separator, a positive electrode plate, and a separator at least once. Here, the positive electrode plate and the negative electrode plate may be configured in the form of a sheet.

[0052] That is, the electrode assembly applied to the present embodiment may be a wound type electrode assembly. In this case, an additional separator may be provided on the outer peripheral surface of the electrode assembly to insulate it from the battery can. That is, the electrode assembly may have a winding structure known in the prior art, but is not limited.

[0053] The positive electrode active material may be coated on one or both sides of the positive electrode plate, and a first uncoated portion may be formed at the end of the positive electrode plate where the positive electrode active material is not coated. The first uncoated portion may be exposed to the outside of the separator while forming a plurality of turns around the center of the electrode assembly, thereby serving as an electrode tab. However, the first uncoated portion may not be formed on the positive electrode plate.

[0054] The negative electrode active material may be coated on one or both sides of the negative electrode plate, and a second uncoated portion may be formed at the end of the negative electrode plate not coated with the negative electrode active material. The second uncoated portion may be exposed to the outside of the separator while forming a plurality of turns around the center of the electrode assembly, thereby serving as an electrode tab. However, the second uncoated portion may not be formed on the negative electrode plate.

[0055] Here, in the case where each of the positive electrode plate and the negative electrode plate includes an uncoated portion, the first uncoated portion and the second uncoated portion may be configured to face opposite directions.

[0056] Furthermore, any active material known in the art may be used as the positive electrode active material coated on the positive electrode plate and the negative electrode active material coated on the negative electrode plate without limitation.

[0057] The separator may be configured as a porous polymer film made of a polyolefin polymer such as ethylene homopolymer, propylene homopolymer, ethylene / butene copolymer, ethylene / hexene copolymer, ethylene / methacrylate copolymer, etc., or by laminating the above porous polymer films.

[0058] As another example, the separator may be configured as a conventional porous non-woven fabric (such as high melting point glass fiber, polyethylene terephthalate fiber, etc.).

[0059] At least one surface of the separator may include a coating of inorganic particles. In addition, the separator itself may also be configured as a coating of inorganic particles. The particles constituting the coating may have a structure in which the particles are combined with a binder to have a gap volume between adjacent particles.

[0060] In addition, the center hole of the electrode assembly is also used for welding the cell terminal (positive electrode terminal) and the positive electrode collector. That is, the cell terminal and the positive electrode collector can be welded by irradiating a laser beam through the center hole of the electrode assembly.

[0061] The electrode assembly is stored in the battery can. In addition, the battery can may have a through hole formed therein. Here, the battery can may be formed in a cylindrical shape, and the electrode assembly may be stored inside the battery can so that the battery can is electrically connected to the negative electrode plate of the electrode assembly. Therefore, the battery can may have the same polarity as the negative electrode plate (i.e., the negative electrode).

[0062] The diameter of the battery can is configured to be larger than the diameter of the electrode assembly. A predetermined gap may be provided between the battery can and the positive electrode collector, and an insulator may be provided in the gap.

[0063] If the size of the electrode assembly is increased in a state where the size of the battery can is fixed according to the standard, the total capacity of the battery cell 100 increases, but the gap between the battery can and the electrode assembly decreases.

[0064] That is, if the size of the electrode assembly is increased to increase the total capacity of the battery cell 100, the gap between the battery can and the electrode assembly is reduced. Therefore, in order to increase the capacity of the battery cell 100, the reduced gap between the battery can and the electrode assembly must be able to accommodate the insulator, and for this reason, it is desirable that the insulator be as thin as possible.

[0065] The battery can may be a substantially cylindrical container and made of a conductive material such as metal. Although the battery can may be made of a conductive metal (such as aluminum, steel, stainless steel, etc.), it is not limited thereto.

[0066] The positive electrode collector is electrically connected to the positive electrode plate, for example, at the top of the electrode assembly. For example, the positive electrode collector can be made of a conductive metal material and electrically connected to the first uncoated portion of the positive electrode plate.

[0067] The cell terminal is made of a conductive metal material and is electrically connected to the positive electrode collector. In addition, the cell terminal is electrically connected to the positive electrode plate of the electrode assembly through the positive electrode collector, thereby providing positive polarity.

[0068] That is, the cell terminal may be used as a positive terminal. In addition, the battery can may be electrically connected to the negative plate of the electrode assembly as described above, and thus may have a negative polarity.

[0069] The negative electrode collector is electrically connected to the negative electrode plate, for example, at the bottom of the electrode assembly. For example, the negative electrode collector can be made of a conductive metal material such as aluminum, steel, copper, nickel, etc., and is electrically connected to the second uncoated portion of the negative electrode plate.

[0070] The negative electrode current collector may be electrically connected to the battery can. To this end, at least a portion of an edge of the negative electrode current collector may be interposed between an inner surface of the battery can and a sealing gasket and fixed thereto.

[0071] In an embodiment, at least a portion of the edge of the negative electrode collector may be fixed to a beaded portion formed on the bottom of the battery can by welding while being supported on a bottom surface of the beaded portion.

[0072] In addition, at least a portion of the remaining portion of the negative electrode current collector (excluding the coupling portion for the curling portion) may be coupled to the curved surface of the second non-coating portion by welding (eg, laser welding).

[0073] Furthermore, at least a portion of the edge of the negative electrode current collector may be electrically connected to one of an upper surface and a lower surface of the curling portion adjacent to the crimping portion.

[0074] The cover plate is configured to seal an opening formed at the bottom of the battery can. The cover plate may be made of, for example, a metal material to ensure rigidity.

[0075] In addition, the cap plate may be separated from the electrode assembly so as not to have polarity. That is, even if the cap plate is made of a conductive metal material, it may not have polarity.

[0076] The fact that the cap plate has no polarity indicates that the cap plate is electrically insulated from the battery can and the cell terminals. As mentioned above, the cap plate does not need to have polarity and is not necessarily made of a conductive metal.

[0077] The cover plate may be placed and supported on a curling portion formed on the battery can. In addition, the cover plate is fixed to a crimping portion described later. A sealing gasket may be inserted between the cover plate and the crimping portion of the battery can to ensure airtightness of the battery can. That is, the sealing gasket may be inserted between the edge of the cover plate and the opening of the battery can.

[0078] Reference Figure 7 , a plurality of battery cells 100 (eg, cylindrical battery cells) are stored in a battery pack case 200. In addition, referring to Figure 3 A vent portion 211 is formed on the pack case 200. The pack case 200 surrounds the plurality of battery cells 100, thereby protecting the battery cells 100 from external vibration or impact.

[0079] The battery pack housing 200 may include, for example, an upper housing 210, a lower housing 220, and a side housing 230. In addition, the exhaust portion 211 may be formed at various positions of the battery pack housing 200 (e.g., at least one of the upper housing 210, the lower housing 220, and the side housing 230). Here, the position of the exhaust portion 211 may vary according to the exhaust direction of the flame or gas. Figure 1 and Figure 3 , the exhaust portion 211 may be formed on the upper case 210 to be directed to the side. However, this is just an example.

[0080] The sealing member 300 is inserted into the insertion groove 212 (see Figure 3 ) may be formed on the battery pack housing 200, for example, on the upper housing 210. Figure 4 As shown, the sealing member 300 is inserted into the insertion groove 212 .

[0081] The battery pack housing 200 can be manufactured, for example, by bending a metal plate, so that the battery pack housing 200 can be manufactured as an integral piece. In the case where the battery pack housing 200 is manufactured as an integral piece, there is an effect of simplifying the connection process. Alternatively, the battery pack housing 200 can also be provided as separate components and then connected to each other by welding or the like. However, the material of the battery pack housing 200 is not limited to metal.

[0082] The sealing member 300 is mounted to the battery pack case 200 to prevent dust or moisture outside the battery pack case 200 from entering the battery pack case 200. Figure 4 and Figure 5 , the sealing member 300 is installed in the upper case 210 of the pack case 200 to seal the pack case 200 and close the vent portion 211 .

[0083] For example, if a thermal event occurs inside the battery pack 10, and if the internal pressure of the battery pack 10 increases rapidly and reaches a predetermined pressure (a pressure sufficient to rupture the sealing member 300), the sealing member 300 ruptures due to the pressure, such as Figure 6 In addition, when the sealing member 300 is broken, the closed vent portion 211 is opened, so that the flame or gas generated inside the pack case 200 flows to the outside of the pack case 200 through the opened vent portion 211 .

[0084] The exhaust portion 211 may be formed in various ways. Figure 3 and Figure 5 , the vent portion 211 may be provided as a recess 215 formed to be recessed in the upper case 210 of the battery pack case 200. Figure 3 In the embodiment, one recess 215 is formed in the upper housing 210, but the number of recesses 215 may vary. In addition, the position of the recess 215 may be changed in various ways. That is, the position and number of the recess 215 may be determined according to the designer's intention, thereby providing an effect of achieving directional discharge without a separate exhaust device.

[0085] In addition, the sealing member 300 may also be arranged across the recess 215 (see Figure 5 As a result, the sealing member 300 can close the recess 215 as the exhaust portion 211.

[0086] The recess 215 can be formed in various shapes. Figure 4 and Figure 5 As shown, the recess 215 may be formed in a rectangular shape. In this case, the recess 215 may have a circular portion 218 formed therein. However, the recess 215 is not limited to the above shape, and may be formed in a polygonal or circular or other deformable shape.

[0087] In addition, refer to Figure 5 , the sealing member 300 may be disposed perpendicular to some edges of the recess 215 , but is not limited thereto.

[0088] Return to reference Figure 5, the sealing member 300 may cross the recess 215 to divide the recess 215 into an outer side 216 and an inner side 217, so that the outer side 216 of the recess 215 and the inner side 217 of the recess 215 have different areas. For example, the area of ​​the inner side 217 of the recess 215 may be larger than the area of ​​the outer side 216 of the recess 215. Here, the inner side 217 of the recess 215 may lead to a portion where flame or gas is expected to be generated, and the outer side 216 of the recess 215 may be configured to be open to the outside (see Figure 1 and Figure 2 ).

[0089] That is, if flame or gas is generated in the portion where gas is expected to be generated inside the battery pack case 200, the flame or gas moves to the inner side 217 of the recess 215. At this time, as described above, Figure 6 As shown, due to the pressure inside the battery cell 100, the sealing member 300 is broken, and the flame or gas moving to the inner side 217 of the recess 215 moves to the outer side 216 through the broken portion of the sealing member 300 (refer to Figure 6 ), and is discharged to the outside of the battery pack housing 200.

[0090] Thus, the flame or gas generated by ignition in the battery cell 100 can be discharged in a predetermined direction (venting portion 211) as desired by the designer (directional discharge), rather than being discharged in a random direction not intended by the designer.

[0091] That is, the battery pack 10 according to the embodiment of the present disclosure has the effect of freely adjusting the exhaust position of the flame or gas and freely determining the size and number of the exhaust portion 211 through which the flame or gas is exhausted.

[0092] At the same time, directional discharge is achieved only by adopting a sealing member 300 required to prevent dust or moisture outside the battery pack housing 200 from entering the battery pack housing 200 and a vent portion 211 formed as a recess 215 on the battery pack housing 200 without adding a separate venting device to achieve directional discharge, thereby reducing costs and achieving easy and convenient manufacturing.

[0093] The sealing member 300 may be inserted into the insertion groove 212 (see FIG. 2 ) formed on the upper case 210 of the battery pack case 200. Figure 3 ). Here, the insertion groove 212 and the recess 215 are communicated with each other. For example, the insertion groove 212 may be formed along the inner circumference of the battery pack housing 200, and the recess 215 may be formed on at least one of the portions in which the insertion groove 212 is formed so as to communicate with the insertion groove 212. That is, if a plurality of recesses 215 are formed, the insertion groove 212 may be communicated with the plurality of recesses 215 at respective positions.

[0094] Reference Figure 4 and Figure 5 , the sealing member 300 is inserted into the insertion groove 212 and supported by the insertion groove 212. However, since the insertion groove 212 is not formed in the area where the recess 215 is formed, the sealing member 300 cannot be supported in the area where the recess 215 is formed. Therefore, if the internal pressure of the battery pack 10 increases in the case of a thermal event, the unsupported portion of the sealing member 300 may be easily ruptured.

[0095] At the same time, refer to Figure 5 , the easily ruptured portion 310 may be formed in the sealing member 300 to facilitate rupture when flame or gas is generated. That is, if the internal pressure of the battery pack 10 increases due to a thermal event, the easily ruptured portion 310 ruptures.

[0096] Here, the easily breakable portion 310 may be configured in various ways. For example, the easily breakable portion 310 may be configured as a cutout portion 311 that is thinner than other portions of the sealing member 300. Figure 5 As shown, the cutout portion 311 may be disposed inside the exhaust portion 211 .

[0097] Alternatively, the breakable portion 310 may also be configured as a cut portion (not shown) formed by pre-cutting the sealing member 300 .

[0098] Meanwhile, although the sealing member 300 may be made of various materials such as ethylene propylene diene monomer (EPDM), the material is not limited thereto.

[0099] Meanwhile, the battery pack 10 may include various types of battery cells 100, such as cylindrical battery cells 100, square battery cells 100, or pouch-type battery cells 100. In addition, the battery pack 10 may further include various devices for controlling the charge and discharge of the battery cells 100 provided in the battery pack 10, such as a BMS, a current sensor, a fuse, and the like.

[0100] Figure 8 is a diagram illustrating a vehicle including a battery pack according to various embodiments of the present disclosure.

[0101] Reference Figure 8 , a vehicle 20 according to an embodiment of the present disclosure may include one or more battery packs 10 according to the various embodiments of the present disclosure described above.

[0102] Here, the vehicle 20 includes various vehicles designed to use electric power such as an electric vehicle or a hybrid vehicle.

[0103] Meanwhile, although terms indicating directions such as up, down, left, and right are used in this specification, it is obvious to those skilled in the art that these terms are merely for convenience of explanation and may vary depending on the position of the target object or the position of the observer.

[0104] As described above, although the present disclosure has been described with reference to limited embodiments and drawings, the present disclosure is not limited thereto, and the present disclosure can be variously modified and deformed by a person skilled in the art to which the present disclosure belongs within the equivalent scope of the technical concept of the present disclosure and the described claims. Therefore, the above-mentioned embodiments should be regarded as intended to describe the embodiments of the present disclosure, rather than intended to limit the embodiments of the present disclosure. In other words, the true scope of the technical concept of the present disclosure is shown in the claims, and all differences within the scope equivalent thereto should be interpreted as included in the present disclosure.

[0105] Industrial Applicability

[0106] The present disclosure relates to a battery pack and a vehicle including the battery pack, and is particularly applicable to industries related to secondary batteries.

Claims

1. A battery pack, comprising: a plurality of battery cells; a battery pack case configured to store the plurality of battery cells and having a vent portion formed thereon; as well as a sealing member mounted to the battery pack case to seal the battery pack case and configured to close the vent portion; The sealing member is ruptured due to a pressure within a predetermined range, so that a flame or gas generated inside the battery pack case is exhausted through the exhaust portion.

2. The battery pack according to claim 1, in, The exhaust portion is provided as a recessed portion formed to be recessed on the battery pack housing, and Wherein, the sealing member is arranged across the recess.

3. The battery pack according to claim 2, in, The sealing member crosses the recess to divide the recess into an outer side and an inner side, and The outer side of the recess and the inner side of the recess have different areas.

4. The battery pack according to claim 3, The area of ​​the inner side of the recess is larger than the area of ​​the outer side of the recess.

5. The battery pack according to claim 4, in, The inner side of the recess opens to a portion where flame or gas is expected to be generated, and Wherein, the outer side of the recess is open to the outside.

6. The battery pack according to claim 2, in, The recess is formed in a rectangular shape, and Wherein, the sealing member is arranged perpendicular to some edges of the recess.

7. The battery pack according to claim 2, in, An insertion groove into which the sealing member is inserted is formed on the battery pack housing, and Wherein, the insertion groove and the recess are communicated with each other.

8. The battery pack according to claim 7, in, The insertion groove is formed along the inner circumference of the battery pack case, and The recessed portion is formed on at least one portion of the portion where the insertion groove is formed so as to communicate with the insertion groove.

9. The battery pack according to claim 1, in, A breakable portion is formed on the sealing member to facilitate breaking when the flame or gas is generated.

10. The battery pack according to claim 9, in, The easily breakable portion is provided as a cutout portion formed to be thinner than other portions of the sealing member.

11. The battery pack according to claim 10, in, The cutout portion is provided inside the exhaust portion.

12. The battery pack according to claim 1, in, The sealing member is made of ethylene propylene diene monomer (EPDM).

13. A vehicle comprising the battery pack according to any one of claims 1 to 12.

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