Battery pack

Abstract

The invention provides a battery pack. The battery pack of the present invention comprises: a main frame having an inner space and an open upper portion; a side member erected to partition an accommodation space of the battery module, the side member having an internal space communicating with the accommodation space, and having gas inlets formed on both sides of the side member in a width direction such that the accommodation space and the internal space communicate with each other; and a cover covering the accommodation space of the main frame, having a flow space connected to the internal space, and having an exhaust outlet connected to the flow space.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0001571, filed on January 5, 2023, and all the contents disclosed in the document of the patent application are incorporated as part of this specification.

[0002] The present invention relates to a battery pack that can effectively discharge and disperse heat energy of high-temperature gas and flame and prevent collapse of a battery pack structure and a battery module structure. Background Art

[0003] Generally, a secondary battery includes a negative electrode, a positive electrode, and an electrolyte, and uses a chemical reaction to generate electrical energy. Due to the advantage of being able to charge and discharge, the use of secondary batteries has gradually increased. Since lithium secondary batteries among such secondary batteries have a high energy density per unit weight, lithium secondary batteries are widely used as power sources for electronic communication devices or as drive sources for high-output hybrid vehicles and electric vehicles.

[0004] In terms of the shape of these secondary batteries, demand is increasing for prismatic battery cells and pouch-type battery cells, which can be applied to products such as mobile phones due to their thin thickness. In terms of battery cell materials, demand is increasing for lithium battery cells (such as lithium ion batteries and lithium ion polymer batteries) with high energy density, discharge voltage, and output stability.

[0005] Types of secondary batteries widely used today include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of these battery cells ranges from approximately 2.5V to 4.2V. When a higher output voltage is required, multiple battery cells are connected in series to form a battery module, and multiple battery modules are connected to form a battery pack. Alternatively, multiple battery cells are connected in parallel to form a battery pack, depending on the required charge and discharge capacity. Therefore, the number of battery cells and the electrical connection structure of a battery pack can be selected in various ways, depending on the desired output voltage or charge and discharge capacity.

[0006] In a battery pack comprising multiple battery modules, it is important to facilitate the dissipation of heat generated by each battery module. In some cases, the heat generated by the battery modules during the battery pack's charge and discharge processes is not effectively dissipated. In such cases, heat accumulates in the battery modules, potentially causing them to degrade. When degradation accelerates, the modules may catch fire or explode. Therefore, high-power, high-capacity battery packs are equipped with cooling devices and safety devices to cool each battery module.

[0007] In related art, a battery pack is disclosed in Korean Patent Application Publication No. 2022-0114354 (published on August 17, 2022, and entitled "Battery Pack"). The disclosure discloses a battery pack having a structure in which gas and flames exhausted from battery modules are introduced into a cross member and exhausted to the outside through exhaust holes provided in an upper case of the battery pack, and a flow guide member protrudes in the width direction inside the cross member.

[0008] The cross members are arranged horizontally in the width direction of the battery pack, and the flow guide members are arranged horizontally to connect the cross members. When foreign matter is generated due to the melting of the material of the battery module or battery cell during a battery module fire, the foreign matter may narrow or block the channel between the horizontal cross member and the flow guide member. In particular, since multiple partition walls and flow blocks are arranged within the channel of the flow guide member, the channel structure of the flow guide member becomes too complicated, and the possibility of the channel being narrowed or blocked by foreign matter is high. When the channels of the cross members and the flow guide member are narrowed or blocked by foreign matter, gas or flames are difficult to discharge from the battery pack, and the internal pressure of the battery pack may increase rapidly. As a result, the structure of the battery module or battery pack may collapse. In addition, as the battery module or battery pack collapses, the flames may be discharged to the outside, which may increase the risk of fire. Summary of the Invention

[0009] Technical issues

[0010] To solve the above problems, an object of the present invention is to provide a battery pack that can quickly discharge gas and heat energy by utilizing the inner space of the side member and the flow space of the cover when a fire occurs in the battery pack or battery module.

[0011] An object of the present invention is to provide a battery pack capable of preventing rapid accumulation of heat energy and rapid increase in internal pressure.

[0012] An object of the present invention is to provide a battery pack capable of preventing the structural collapse of a battery pack or a battery module.

[0013] An object of the present invention is to provide a battery pack capable of significantly reducing the amount of dust emitted.

[0014] An object of the present invention is to provide a battery pack without additional structures for heat and gas discharge.

[0015] The technical problems to be solved by the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention that are not described can be understood through the following description and will be more clearly understood through the examples of the present invention. In addition, it is obvious that the objects and advantages of the present invention can be implemented by the means indicated in the claims and their combinations.

[0016] Technical Solution

[0017] In order to solve the above problems, the battery pack of the present invention includes: a main frame, which is provided with an internal space and an open upper part; a side beam, which divides the accommodating space for accommodating battery modules, and the side beam is provided with an internal space spatially connected to the accommodating space, the side beam includes a gas inlet arranged at both ends of the side beam in the width direction, the gas inlet spatially connecting the accommodating space and the internal space; and a cover, which covers the accommodating space of the main frame and is provided with a flow space spatially connected to the internal space and an exhaust outlet spatially connected to the flow space.

[0018] The gas inlet may be provided at a predetermined height higher than an upper end portion of the battery module.

[0019] The side member may further include an inner partition wall that divides the inner space in the width direction.

[0020] A lower pocket spatially connected to the inner space may be provided below the inner space of the side member.

[0021] A slide member may be provided between the inner space and the lower bag.

[0022] The chute member may include: a first chute that is arranged below the gas inlet and is inclined downward from the inner surface of the side beam toward the width center of the side beam; and a second chute that is inclined downward from the inner partition wall of the side beam toward the inner surface of the side beam.

[0023] The first slide groove may be spaced apart from the inner partition wall, and the second slide groove may be spaced apart from the inner side surface of the side member.

[0024] The dust in the inner space descends along the chute member and is deposited in the lower bag, and the chute member can prevent the dust in the lower bag from moving upward into the inner space.

[0025] At least one flow partition wall may be installed in the flow space of the cover, the flow partition wall extending in a width direction of the cover and partially blocking the flow space in a length direction to form a flow channel.

[0026] The gas introduced through the lower inlet and flowing in the flow space toward the exhaust outlet of the cover may be guided in the width direction by the flow partition wall.

[0027] A pocket-shaped protrusion protruding upward across the flow channel may be provided at the bottom of the flow space of the cover.

[0028] The flow dividing wall may be parallel to a width direction of the cover, and the pocket-shaped protrusion may be parallel to a length direction of the cover.

[0029] The pocket-shaped protrusions can guide the dust mixed in the gas to be deposited in the pocket-shaped spaces divided by the pocket-shaped protrusions.

[0030] The lower inlet of the cover may be provided at a central portion of the cover, and the exhaust outlet may be provided at lengthwise ends of the cover.

[0031] An upper outlet may be provided at an upper surface of one end of the side beam in the length direction, and a lower inlet may be provided at a portion of the bottom surface of the cover facing the upper outlet, and the upper outlet and the lower inlet may spatially connect the inner space of the side beam to the flow space of the cover.

[0032] The gas generated in the battery module can be introduced into the inner partition wall of the side beam through the gas inlet in a portion of the accommodating space located above the battery module, flow along the length direction of the inner space of the side beam, enter the flow space of the cover through the upper outlet and the lower inlet, and after passing through the flow space of the cover, can be discharged to the outside through the exhaust outlet.

[0033] Beneficial effects

[0034] According to the present invention, since gas and heat are quickly discharged by utilizing the inner space of the side member and the flow space of the cover as wide spaces in the battery pack, rapid heat accumulation and internal pressure increase in the battery pack can be prevented.

[0035] According to the present invention, rapid heat accumulation and internal pressure increase in a battery pack can be prevented, thereby preventing the structural collapse of a battery pack or a battery module.

[0036] According to the present invention, since dust mixed in the gas is removed from the inner space of the side sill and the flow space of the cover, the amount of discharged dust can be significantly reduced.

[0037] According to the present invention, since the flow space of the cover is significantly larger than the internal space of the side sills, the flow rate of gas and dust can be quickly slowed down in the flow space of the cover to diffuse and disperse. As a result, the dust mixed in the gas is deposited at the bottom of the flow space of the cover, and the amount of dust discharged through the exhaust outlet can be significantly reduced.

[0038] According to the present invention, since the side members and the cover are used as passages for exhausting gas or heat energy, there is no need to add a separate structure for exhausting heat energy and gas to the battery pack.

[0039] In addition to the above-mentioned beneficial effects, specific effects of the present invention will be further described while describing specific details of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1is a perspective view schematically illustrating a main frame of a battery pack having an inner space partitioned by side members according to the present invention.

[0041] Figure 2 is a perspective view schematically illustrating a main frame of a battery pack having an accommodation space in which a battery module is accommodated according to the present invention.

[0042] Figure 3 is a plan view schematically illustrating a main frame of a battery pack having an accommodation space in which a battery module is accommodated according to the present invention.

[0043] Figure 4 This is a schematic illustration of a cover installed. Figure 2 A perspective view of the main frame.

[0044] Figure 5 is a schematic illustration along Figure 4 A three-dimensional cross-sectional view of the flow space mechanism of the cover taken along line VV.

[0045] Figure 6 is a schematic illustration along Figure 3 A cross-sectional view of the battery pack taken along line VI-VI.

[0046] Figure 7 is a perspective view schematically illustrating the flow direction of gas in the side sill according to the present invention.

[0047] Figure 8 is a schematic illustration along Figure 3 A cross-sectional view of the battery pack taken along line VIII-VIII.

[0048] Figure 9 is a plan view schematically illustrating the flow of gas in the flow space of the cover according to the present invention.

[0049] Figure 10 is a perspective view schematically illustrating exhaust of gas through an exhaust outlet of a cover according to the present invention.

[0050] [Explanation of Reference Numerals]

[0051] 10: Battery pack 20: Main frame A: Accommodation space 22: Bottom member 23: Side wall member 24: Center beam 25: Side beam I: Internal space 251: Gas inlet 253: Internal partition wall 255: Slide member 255a: First slide 255b: Second slide 257: Upper outlet P: Lower pocket 30: Cover F: Flow space 31: Lower inlet 33: Flow partition wall 35: Pocket protrusion 39: Exhaust outlet 50: Battery module G: Height DETAILED DESCRIPTION

[0052] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0053] The present invention is not limited to the embodiments disclosed hereinafter, and various changes can be applied and can be implemented in various different forms. The embodiments herein are provided only to complete the disclosure of the present invention and to fully inform those skilled in the art of the scope of the present invention. Therefore, the present invention is not limited to the embodiments disclosed hereinafter, and it should be understood that the present invention includes all modifications and equivalents included in the technical spirit and scope of the present invention, as well as replacing or adding the configuration of one embodiment with the configuration of another embodiment.

[0054] The accompanying drawings are intended only to facilitate understanding of the embodiments disclosed herein, and it should be understood that the technical concepts disclosed herein are not limited by the accompanying drawings and include all modifications, equivalents, and alternatives within the spirit and technical scope of the present invention. In the accompanying drawings, although the size or thickness of components may be exaggerated or reduced for ease of understanding, this should not be construed as limiting the scope of protection of the present invention.

[0055] The terms used herein are only used to describe specific embodiments or examples and are not intended to limit the present invention. In addition, expressions in the singular include expressions in the plural, unless the context clearly dictates otherwise. In this article, terms such as "including" and "consisting of" are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification. That is, it should be understood that terms such as "including" and "consisting of" used herein should not exclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0056] Although terms including ordinal numbers such as "first" and "second" may be used to describe various components, the components are not limited by these terms. These terms are used only for the purpose of distinguishing one component from another.

[0057] It should be understood that when an element is referred to as being “connected” to another element, the element can be directly connected to the other element or intervening elements can exist in between. On the other hand, when an element is referred to as being “directly connected” to another element, it should be understood that there are no intervening elements in between.

[0058] When an element is referred to as being 'on' or 'under' another element, it should be understood that intervening elements may be present as well as being directly above or under the other element.

[0059] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant technology, and unless explicitly defined herein, terms such as those defined in commonly used dictionaries should not be interpreted in an ideal or overly formal sense.

[0060] Hereinafter, a battery pack according to an embodiment of the present invention will be described.

[0061] Figure 1 is a perspective view schematically illustrating a main frame of a battery pack having an inner space partitioned by side beams according to the present disclosure, Figure 2 is a perspective view schematically illustrating a main frame of a battery pack having an accommodation space in which a battery module is accommodated according to the present disclosure, Figure 3 is a plan view schematically illustrating a main frame of a battery pack having an accommodation space in which a battery module is accommodated according to the present disclosure, Figure 4 This is a schematic illustration of a cover installed. Figure 2 A three-dimensional diagram of the main frame, Figure 5 is a schematic illustration along Figure 4 A three-dimensional cross-sectional view of the structure of the flow space of the cover taken along line VV, Figure 6 is a schematic illustration along Figure 3 A cross-sectional view of the battery pack taken along line VI-VI, Figure 7 is a perspective view schematically illustrating a flow direction of gas in a side sill according to the present disclosure.

[0062] Reference Figures 1 to 7 , the battery pack 10 according to the embodiment of the present invention includes a main frame 20 , side members 25 , and a cover 30 .

[0063] The main frame 20 is provided with an inner space I and an open upper portion. The main frame 20 may be rectangular as a whole.

[0064] The main frame 20 includes a bottom member 22 and side wall members 23. The rectangular bottom member 22 extends in both width and length. The side wall members 23 are connected to the edges of the bottom member 22 and extend upward. In other words, the bottom member 22 has a rectangular panel shape, and the side wall members 23 have a rectangular frame shape.

[0065] The side beams 25 extend in the lengthwise direction to divide the storage space A defined by the bottom member 22 and the sidewall members 23 in the widthwise direction. The side beams 25 are erected to partition the storage space A for accommodating the battery modules 50 and define an interior space I that is spatially connected to the storage space A. Gas inlets 251 may be provided at both ends of the side beams 25 in the widthwise direction to spatially connect the storage space A and the interior space I. The side beams 25 generally have the shape of a rectangular panel and are arranged parallel to the lengthwise direction of the main frame 20.

[0066] A center beam 24, parallel to the width of the main frame 20, is installed in the interior space I of the main frame 20. Side beams 25 are installed on both sides of the center beam 24. The center beam 24 and the side beams 25 intersect each other perpendicularly. The center beam 24 divides the accommodation space A along the length direction, and the side beams 25 divide the accommodation space A along the width direction.

[0067] The cover 30 is installed to cover the accommodation space A of the main frame 20, has a flow space F spatially connected to the internal space I, and is provided with an exhaust outlet 39 spatially connected to the flow space F. The cover 30 has a rectangular panel shape to cover the entire upper portion of the main frame 20.

[0068] When the battery pack 10 or the battery module 50 catches fire, gas and flames may be generated. In addition, when the high-temperature gas or flame melts the material of the battery module 50 or the battery cell, foreign matter such as dust may be generated.

[0069] The accommodation space A, the gas inlet 251, the internal space I, the flow space F, and the exhaust outlet 39 are spatially connected in sequence. Therefore, when a fire occurs in the battery module 50, gas and heat generated can be quickly discharged through the internal space I of the side member 25 and the flow space F of the cover 30. In other words, since gas and heat are quickly discharged by utilizing the internal space I and the flow space F, which are wide spaces in the battery pack 10, the accumulation of heat energy inside the battery pack 10 and the increase in internal pressure can be prevented.

[0070] Furthermore, as the gas and heat energy in the storage space A flow into the internal space I of the side sill 25 and along the length of the side sill 25, the majority of the dust mixed in the gas falls downward within the internal space I of the side sill 25. Furthermore, because the size of the flow space F of the cover 30 is significantly larger than that of the internal space I of the side sill 25, the flow rate of the gas and dust can be rapidly slowed within the flow space F of the cover 30, allowing them to diffuse and disperse. Consequently, when the dust mixed in the gas settles at the bottom of the flow space F of the cover 30, the amount of dust discharged through the exhaust outlet 39 can be significantly reduced. By reducing the amount of dust discharged through the exhaust outlet 39, the discharge of flames from the battery pack 10 can be suppressed.

[0071] In addition, since the size of the flow space F of the cover 30 is significantly larger than the size of the internal space I of the side member 25, the internal pressure can be reduced in the flow space F of the cover 30, and the concentration of heat energy can also be dispersed and alleviated.

[0072] Furthermore, since the side members 25 and the cover 30 serve as passages for exhausting gas or heat energy, there is no need to add a separate structure for exhausting heat energy and gas to the battery pack 10 .

[0073] As described above, by reducing the amount of discharged dust and lowering heat energy and internal pressure, the structural collapse of the battery module 50 and the battery pack 10 can be prevented.

[0074] The gas inlet 251 is provided at a predetermined height (G: see Figure 6 ) at a location. Here, at least two gas inlets 251 may be provided in the upper portion of the side member 25 along the length direction of the side member 25. Since the gas inlets 251 are positioned higher than the upper end portion of the battery module 50, dust generated in the battery module 50 can be blocked by the periphery of the gas inlets 251 and guided to settle again in the upper end portion of the battery module 50. Therefore, dust generated when a fire occurs in the battery module 50 can be prevented from being discharged from the battery pack 10.

[0075] The side member 25 may further include an internal partition wall 253 that divides the internal space I along the width direction. Since the internal partition wall 253 divides the internal space I of the side member 25 into two spaces, it is possible to prevent gas, dust, heat, and flames in a particular accommodation space A from flowing into the internal space I and then into the adjacent accommodation space A and battery module 50. In addition, it is possible to prevent adjacent battery modules 50 from spreading flames to each other.

[0076] A lower pocket P, spatially connected to the interior space I of the side sill 25, may be disposed below the interior space I. Furthermore, a chute member 255 may be disposed between the interior space I and the lower pocket P. Thus, dust flowing into the interior space I of the side sill 25 can descend along the chute member 255 and be deposited at the bottom of the lower pocket P. Furthermore, since the chute member 255 is disposed between the interior space I and the lower pocket P, dust deposited in the lower pocket P can be prevented from floating upward and rising back into the interior space I.

[0077] The slide groove member 255 includes a first slide groove 255a and a second slide groove 255b.

[0078] The first chute 255a is disposed below the gas inlet 251 and is inclined downward from the inner surface of the side member 25 toward the widthwise center. At least one first chute 255a may be installed below the gas inlet 251.

[0079] The second chute 255b slopes downward from the inner partition wall 253 of the side beam 25 toward the inner surface of the side beam 25. At least one second chute 255b may be installed below the first chute 255a. The first chute 255a and the second chute 255b are arranged to slope downward in opposite directions. Therefore, dust falling from the gas inlet 251 can slide downward on the surfaces of the first and second chute 255a, 255b and be deposited in the lower bag P. Furthermore, even if dust deposited in the lower bag P floats upward, it can be blocked by the first and second chute 255a, 255b, preventing it from flowing upward.

[0080] The first chute 255a may be spaced apart from the inner partition wall 253, and the second chute 255b may be spaced apart from the inner side surface of the side member 25. Here, since the passage of the first chute 255a and the passage of the second chute 255b are arranged on opposite sides, the first chute 255a and the second chute 255b may form a passage for dust to fall downward while blocking the inner space I of the side member 25.

[0081] The lower inlet 31 of the cover 30 is arranged at the center portion of the cover 30, and the exhaust outlet 39 is arranged at the end portion in the longitudinal direction of the cover 30. Therefore, since the distance between the lower inlet 31 and the exhaust outlet 39 is arranged to be the greatest, a long flow channel can be formed for gas and dust to move in the flow space F of the cover 30. In addition, a relatively large amount of dust mixed in the gas can be deposited in the flow space F of the cover 30.

[0082] An upper outlet 257 is provided on an upper surface of one end in the length direction of the side beam 25, and a lower inlet 31 is provided at a bottom surface of the cover 30 facing the upper outlet 257. The upper outlet 257 and the lower inlet 31 spatially connect the interior space I of the side beam 25 to the flow space F of the cover 30. Therefore, gas and dust in the interior space I of the side beam 25 are introduced into the flow space F of the cover 30 through the upper outlet 257 and the lower inlet 31.

[0083] Figure 5 is a schematic illustration along Figure 4 A three-dimensional cross-sectional view of the structure of the flow space of the cover taken along line VV, Figure 6 is a schematic illustration along Figure 3 A cross-sectional view of the battery pack taken along line VI-VI, Figure 7 is a perspective view schematically illustrating the flow direction of gas in the side sill according to the present invention, Figure 8 is a schematic illustration along Figure 3 A cross-sectional view of the battery pack taken along line VIII-VIII. Figure 9 is a plan view schematically illustrating the flow of gas in the flow space of the cover according to the present invention, and Figure 10 is a perspective view schematically illustrating exhaust of gas through an exhaust outlet of a cover according to the present invention.

[0084] Reference Figures 5 to 10 At least one flow partition wall 33 may be installed in the flow space F of the cover 30. The flow partition wall 33 extends in the width direction of the cover 30 and partially blocks the flow space F in the length direction to form a flow channel. Here, the flow partition wall 33 has a height such that the upper portion of the flow space F of the cover 30 is connected to the lower portion of the flow space F of the cover 30.

[0085] The following is a description of a structure in which a plurality of flow partition walls 33 are provided in the flow space F of the cover 30 .

[0086] Both ends of the flow partition wall 33 arranged in the odd-numbered positions from the lower inlet 31 may be spaced apart from both ends in the width direction of the cover 30. Both ends of the flow partition wall 33 arranged in the even-numbered positions from the lower inlet 31 may be connected to both ends in the width direction of the cover 30, and the flow partition wall 33 arranged in the even-numbered positions from the lower inlet 31 may be separated at the central portion thereof.

[0087] In addition, both ends of the flow partition wall 33 arranged in odd-numbered positions from the lower inlet 31 may be connected to both ends in the width direction of the cover 30. Both ends of the flow partition wall 33 arranged in even-numbered positions from the lower inlet 31 may be spaced apart from both ends in the width direction of the cover 30.

[0088] Therefore, the plurality of flow partition walls 33 may form a zigzag flow channel in the flow space F of the cover 30 . Obviously, the plurality of flow partition walls 33 may form various types of flow channels in the flow space F of the cover 30 .

[0089] In addition, when the gas introduced through the lower inlet 31 flows in the flow space F toward the exhaust outlet 39 of the cover 30 , the flow may be guided in the width direction by the flow partition wall 33 .

[0090] The flow partition wall 33 partially blocks the flow space F to change the flow direction of the gas and dust. Therefore, the flow time and distance of the gas and dust in the flow space F of the cover 30 can be increased. Furthermore, by increasing the flow time and distance of the gas and dust, the amount of dust mixed in the gas that settles at the bottom of the flow space F can be increased, thereby minimizing the amount of dust discharged.

[0091] A pocket-shaped protrusion 35 that protrudes upward across the flow channel may be provided at the bottom of the flow space F of the cover 30. A plurality of pocket-shaped protrusions 35 may be installed at a pair of flow partition walls 33. The height of the pocket-shaped protrusion 35 is smaller than that of the flow partition walls 33. Because the pocket-shaped protrusions 35 act as a resistance to the gas and dust flowing along the flow channel, dust may be deposited in the pocket-shaped spaces between the pocket-shaped protrusions 35. Since the pocket-shaped protrusions 35 are arranged in a row between a pair of adjacent flow partition walls 33, although dust is deposited in each pocket-shaped space, the total amount of deposited dust can be significantly increased as the number of pocket-shaped protrusions 35 increases. Therefore, the amount of dust discharged through the exhaust outlet 39 can be significantly reduced.

[0092] The flow partition wall 33 is parallel to the width direction of the cover 30, and the pocket protrusion 35 is parallel to the length direction of the cover 30. Here, the pocket protrusion 35 may be perpendicular to the flow partition wall 33. Obviously, the pocket protrusion 35 may be arranged obliquely relative to the flow partition wall 33.

[0093] According to the present invention, gas generated when a fire occurs in the battery module 50 is introduced into the inner space I of the side member 25 through the gas inlet 251 above the battery module 50 in the accommodation space A. The gas in the inner space I flows along the length direction of the inner space I of the side member 25 and is introduced into the flow space F of the cover 30 through the upper outlet 257 and the lower inlet 31. Thereafter, the gas passes through the flow space F of the cover 30 and is discharged to the outside through the exhaust outlet 39.

[0094] Furthermore, according to the present invention, dust mixed in the gas when a battery module 50 fire occurs is blocked around the gas inlet 251 for initial removal. Furthermore, dust passing through the gas inlet 251 is removed a second time by falling into the lower pocket P of the side sill 25. Dust in the interior space I of the side sill 25 is removed a third time while flowing through the flow space F of the cover 30. This prevents the gas flow passages of the battery pack 10 from being narrowed or blocked by dust generated when a battery module 50 fire occurs.

[0095] In addition, since the gas flow channel can be prevented from being blocked, a rapid increase in the internal pressure of the battery pack 10 can be prevented. In addition, the structure of the battery module 50 or the battery pack 10 can be prevented from collapsing, and flames can be prevented from being discharged to the outside due to the collapse, thereby reducing the risk of fire.

[0096] Although the present invention has been described with reference to the exemplary drawings, it should be understood that the present invention is not limited to the embodiments and drawings disclosed in this specification, and it will be understood by those skilled in the art that various modifications can be made without departing from the scope and concept of the present invention. In addition, although the operational effects of the configuration according to the present invention are not explicitly described while describing the embodiments of the present invention, it should be understood that predictable effects will also be recognized by the configuration.

Claims

1. A battery pack, comprising: a main frame having an interior space and an open upper portion; a side member, the side member dividing the accommodation space for accommodating the battery module, the side member being provided with an inner space spatially connected to the accommodation space, the side member including a gas inlet provided at both ends in a width direction of the side member, the gas inlet spatially connecting the accommodation space and the inner space; as well as a cover covering the accommodation space of the main frame and provided with a flow space connected to the internal space and an exhaust outlet connected to the flow space, The gas inlet is provided at a predetermined height higher than an upper end portion of the battery module.

2. The battery pack according to claim 1, wherein: The side member further includes an inner partition wall that divides the inner space in a width direction.

3. The battery pack according to claim 1, wherein: A lower pocket connected to the inner space is provided below the inner space of the side member, and A slide member is provided between the inner space and the lower bag.

4. The battery pack according to claim 3, wherein: The chute component comprises: a first chute disposed below the gas inlet and inclined downward from an inner surface of the side member toward a center in a width direction of the side member; and A second slide groove is inclined downward from an inner partition wall of the side member toward the inner side surface of the side member.

5. The battery pack according to claim 4, wherein: The first chute is spaced apart from the inner partition wall, and The second slide groove is spaced apart from the inner side surface of the side member.

6. The battery pack according to claim 3, wherein: The dust in the inner space falls along the chute member and is deposited in the lower bag, and The chute member prevents dust in the lower bag from moving upward into the inner space.

7. The battery pack according to claim 1, wherein: At least one flow partition wall is installed in the flow space of the cover, the flow partition wall extending in a width direction of the cover and partially blocking the flow space in a length direction to form a flow channel.

8. The battery pack according to claim 7, wherein: The gas introduced through the lower inlet and flowing in the flow space toward the exhaust outlet of the cover is guided in the width direction by the flow partition wall.

9. The battery pack according to claim 7, wherein: A pocket-shaped protrusion protruding upward across the flow channel is provided at the bottom of the flow space of the cover.

10. The battery pack according to claim 9, wherein: The flow dividing wall is parallel to the width direction of the cover, and The bag-shaped protrusion is parallel to the length direction of the cover.

11. The battery pack according to claim 9, wherein: The pocket-shaped protrusions guide dust mixed in the gas to be deposited in the pocket-shaped spaces defined by the pocket-shaped protrusions.

12. The battery pack according to claim 1, wherein The lower inlet of the cover is provided at a central portion of the cover, and The exhaust outlet is provided at an end portion of the cover in a longitudinal direction.

13. The battery pack according to claim 1, wherein An upper outlet is provided on the upper surface of one end of the side beam in the longitudinal direction. A lower inlet is provided at a portion of the bottom surface of the cover facing the upper outlet, The upper outlet and the lower inlet connect the inner space of the side member to the flow space of the cover.

14. The battery pack according to claim 13, wherein: Gas generated in the battery module is introduced into the inner partition wall of the side beam through the gas inlet in a portion of the accommodating space located above the battery module, flows along the length direction of the inner space of the side beam, enters the flow space of the cover through the upper outlet and the lower inlet, and is discharged to the outside through the exhaust outlet after passing through the flow space of the cover.

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