Battery pack

Abstract

The present invention discloses a battery pack, which includes a main frame having an accommodation space for a battery module and an open top, side beams erected to partition the accommodation space and having an inner space communicating with the accommodation space, with gas inlets formed on both sides of the side beams in a width direction to allow communication between the accommodation space and the inner space, and a cover installed to cover the accommodation space of the main frame, having a flow space connected to the inner space, and having a vent 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 January 5, 2023, and all contents disclosed in the documents of this Korean Patent Application are incorporated herein by reference.

[0002] The present invention relates to a battery pack that can effectively exhaust and dissipate the thermal energy of high-temperature gases and flames, and prevent the structure of the battery pack and the structure of the battery modules from collapsing. [Background technology]

[0003] Typically, a secondary battery includes a positive electrode, a negative electrode, and an electrolyte, and generates electrical energy through a chemical reaction. The use of secondary batteries is gradually increasing due to their rechargeable / dischargeable characteristics. Among these secondary batteries, lithium secondary batteries, with their high energy density per unit weight, are widely used as power sources for electronic communication devices and as driving sources for high-power hybrid and electric vehicles.

[0004] In terms of the shape of these secondary batteries, there is an increasing demand for prismatic and pouch-type battery cells that are thin and can be applied to products such as mobile phones, etc. In terms of battery cell materials, there is an increasing demand for lithium battery cells such as lithium-ion batteries and lithium-ion polymer batteries that have high energy density, discharge voltage, and output stability.

[0005] Currently, widely used types of secondary batteries 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 is approximately 2.5V to 4.2V. If a higher output voltage is required, a battery module is formed by connecting multiple battery cells in series, and a battery package is formed by connecting multiple battery modules. Furthermore, a battery package is formed by connecting multiple battery cells in parallel depending on the charge / discharge capacity required for the battery package. As a result, the number of battery cells and the electrical connection structure of the battery package can be variously set depending on the required output voltage or charge / discharge capacity.

[0006] It is important for battery packages containing multiple battery modules to easily dissipate heat generated in each battery module. Heat generated in the battery modules during the charging and discharging process of the battery package may not be effectively dissipated. This can lead to heat accumulation in the battery modules, accelerating their degradation. Accelerated degradation of the battery modules can lead to fires or explosions. For this reason, high-power, large-capacity battery packages are equipped with cooling devices and safety devices to cool each battery module.

[0007] The background art of the present invention is disclosed in Korean Patent Publication No. 2022-0114354 (published on August 17, 2022, invention title: battery pack). The battery pack has a structure in which gas and flames discharged from a battery module flow into a cross member and are discharged to the outside through a vent hole formed in an upper housing of the battery pack, and a flow guide member protrudes in the width direction inside the cross member.

[0008] The crossing member is formed horizontally in the width direction of the battery pack, and the flow guide member is formed horizontally to connect the crossing member. When the battery module catches fire, if foreign matter (foreign matter) is generated due to melting of the battery module material or battery cells, the foreign matter may narrow or block the passage between the horizontal crossing member and the flow guide member. In particular, because the passage of the flow guide member is provided with a plurality of partitions and flow-blocking members, the structure of the passage of the flow guide member becomes too complex, increasing the possibility of the passage being narrowed or blocked by foreign matter. If the passage between the crossing member and the flow guide member is narrowed or blocked by foreign matter, gas or flames are difficult to vent from the battery pack, and the internal pressure of the battery pack may increase rapidly. This may cause the structure of the battery module or the battery pack to collapse. Furthermore, if the battery module or the battery pack collapses, flames may be vented to the outside, increasing the risk of fire. Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been devised to solve the above-mentioned problems, and aims to provide a battery pack that can quickly release gas and heat energy by utilizing the internal space of the side beam and the fluid space of the lid when the battery pack or battery module catches fire.

[0010] An object of the present invention is to provide a battery pack that can prevent a sudden accumulation of thermal energy and a sudden increase in internal pressure.

[0011] An object of the present invention is to provide a battery pack that can prevent structural collapse of the battery pack or battery module.

[0012] An object of the present invention is to provide a battery pack that can significantly reduce the amount of dust emissions.

[0013] SUMMARY OF THE INVENTION An object of the present invention is to provide a battery pack that does not require the addition of a separate structure for discharging thermal energy and gas.

[0014] The technical object of the present invention is not limited to the above-mentioned objects, and other unmentioned objects and advantages of the present invention can be understood from the following description and can be more clearly understood from the examples of the present invention. Furthermore, it can be easily understood that the objects and advantages of the present invention can be achieved by the means and combinations thereof set forth in the claims. [Means for solving the problem]

[0015] In order to solve the above-mentioned problems, a battery pack according to the present invention includes a main frame having an accommodation space for a battery module and an open top; side beams erected to partition the accommodation space and having an internal space communicating with the accommodation space, with gas inlets formed on both sides of the side beams in a width direction so that the accommodation space and the internal space communicate with each other; and a cover installed to cover the accommodation space of the main frame, having a flow space connected to the internal space, and having a vent outlet connected to the flow space.

[0016] The gas inlet may be disposed at a position higher than an upper end of the battery module by a predetermined height.

[0017] The side beam may further include an internal partition wall that separates the internal space in the width direction.

[0018] A lower pocket may be formed in the side beam at a lower portion of the internal space, the lower pocket communicating with the internal space.

[0019] A chute member may be formed between the internal space and the lower pocket.

[0020] The chute member may include a first chute section disposed below the gas inlet and formed obliquely downward on the widthwise center side of the inner surface of the side beam, and a second chute section formed obliquely downward on the inner surface of the side beam at the internal partition of the side beam.

[0021] The first chute portion may be spaced apart from the internal partition wall, and the second chute portion may be spaced apart from an inner surface of the side beam.

[0022] Dust in the internal space rides down on the chute member and accumulates in the lower pocket, and the chute member can prevent dust in the lower pocket from rising up into the internal space.

[0023] The flow space of the lid may be provided with at least one flow partition wall extending in the width direction of the lid and partially dividing the flow space in the length direction to form a flow passage.

[0024] While the gas that has flowed into the flow space flows within the flow space toward the vent outlet of the lid, the flow can be guided in the width direction by the flow partition.

[0025] A pocket protrusion that protrudes upward may be formed at the bottom of the flow space of the lid, crossing the flow passage.

[0026] The flow partitions may be formed side by side in the width direction of the lid, and the pocket protrusions may be formed side by side in the length direction of the lid.

[0027] The pocket convex portion can guide dust mixed in the gas so that it accumulates in the pocket space partitioned by the pocket convex portion.

[0028] The lower inlet of the lid may be located towards the centre of the lid, and the vent outlet may be located at an end of the lid in the length direction.

[0029] An upper outlet is provided on an upper surface of one end of the side beam in the longitudinal direction, and a lower inlet is provided on a bottom surface of the lid at a position opposite the upper outlet, and the upper outlet and the lower inlet can connect the internal space of the side beam to the flow space of the lid.

[0030] Gas generated in the battery module may flow into the internal partition of the side beam through the gas inlet in an upper space of the battery module in the accommodating space, flow along the length of the internal space of the side beam, flow into the flow space of the lid through the upper outlet and the lower inlet, pass through the flow space of the lid, and be discharged to the outside through the vent outlet. [Effects of the Invention]

[0031] According to the present invention, the large internal space of the side beam and the flow space of the lid, which are large spaces in the battery pack, are utilized to quickly discharge gas and thermal energy, thereby preventing a sudden accumulation of thermal energy and an increase in internal pressure inside the battery pack.

[0032] According to the present invention, it is possible to prevent a sudden accumulation of thermal energy and a sudden increase in internal pressure inside the battery pack, thereby preventing structural collapse of the battery pack and battery modules.

[0033] According to the present invention, dust mixed in the gas is removed in the internal space of the side beam and the flow space of the lid, so that the amount of dust emitted can be significantly reduced.

[0034] According to the present invention, the flow space of the cover is significantly wider than the internal space of the side beam, so the flow speed of gas and dust can be rapidly slowed in the flow space of the cover, allowing them to diffuse and disperse. As a result, dust mixed with gas can be immersed at the bottom of the flow space of the cover, significantly reducing the amount of dust discharged through the vent outlet.

[0035] According to the present invention, since the side beams and the cover are used as passages for discharging gas and heat energy, it is not necessary to add a separate structure to the battery pack for discharging heat energy and gas.

[0036] The above-mentioned effects and specific effects of the present invention will be described in conjunction with the following description of the preferred embodiment of the invention. [Brief explanation of the drawings]

[0037] [Figure 1] 10 is a perspective view showing a state in which the accommodation space of the main frame of the battery pack according to the present invention is divided by side beams; FIG. [Figure 2] 1 is a perspective view schematically illustrating a state in which a battery module is accommodated in an accommodating space of a main frame of a battery pack according to the present invention; [Figure 3] 1 is a plan view schematically showing a state in which a battery module is accommodated in an accommodating space of a main frame of a battery pack according to the present invention; [Figure 4] 3 is a perspective view schematically showing a state in which a lid is installed on the upper side of the main frame of FIG. 2.

[0023] FIG. [Figure 5] 5 is a perspective view showing a schematic structure of the flow space of the lid in a state where the VV line in FIG. 4 is cut open. FIG. [Figure 6] 6 is a cross-sectional view schematically showing the battery pack of FIG. 3 taken along line VI-VI. [Figure 7] FIG. 10 is a perspective view schematically illustrating the flow direction of gas in a side beam according to the present invention. [Figure 8] 8 is a cross-sectional view schematically showing the battery pack of FIG. 3 taken along line VIII-VIII. [Figure 9] 1 is a plan view schematically illustrating a gas flow state in a flow space of a cover according to the present invention; [Figure 10] 1 is a perspective view showing a schematic view of gas being discharged from a vent outlet of a lid according to the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0038] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0039] The present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms and may be modified in various ways. However, these embodiments are provided to complete the disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art. Therefore, the present invention is not limited to the embodiments disclosed below, and should be understood to include any modifications, equivalents, or alternatives within the technical spirit and scope of the present invention, as well as the substitution or addition of the configuration of any embodiment with the configuration of another embodiment.

[0040] The accompanying drawings are intended to facilitate understanding of the embodiments disclosed in this specification, and should not be construed as limiting the technical ideas disclosed in this specification, but should be understood to include any modifications, equivalents, or alternatives that fall within the spirit and technical scope of the present invention. The components in the drawings may be exaggerated in size or thickness for ease of understanding, but this should not be interpreted as limiting the scope of protection of the present invention.

[0041] The terms used in this specification are merely used to describe particular embodiments or examples and are not intended to limit the present invention. Furthermore, singular terms include plural terms unless the context clearly dictates otherwise. The terms "comprises," "constitutes," and the like in the specification are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification. In other words, the terms "comprises," "constitutes," and the like in the specification should not be understood to preclude the presence or possibility of adding one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0042] Although terms including ordinal numbers, such as first, second, etc., are used to describe various components, the components are not limited by the terms and are used only to distinguish one component from another.

[0043] When a component is referred to as being "coupled" or "connected" to another component, it should be understood that it may be directly coupled or connected to the other component, but that there may be other components between them. On the other hand, when a component is referred to as being "directly coupled" or "directly connected" to another component, it should be understood that there are no other components between them.

[0044] When a component is referred to as being "on top of" or "under" another component, it should be understood that it may not only be located directly on top of the other component, but that there may be other components in between.

[0045] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms similar to those defined in commonly used dictionaries should be interpreted to have a meaning consistent with the meaning they have in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined in this application.

[0046] In the following, a battery pack according to an embodiment of the present invention will be described.

[0047] FIG. 1 is a perspective view schematically showing the state in which the storage space of the main frame of a battery pack according to the present invention is divided by side beams; FIG. 2 is a perspective view schematically showing the state in which a battery module is stored in the storage space of the main frame of a battery pack according to the present invention; FIG. 3 is a plan view schematically showing the state in which a battery module is stored in the storage space of the main frame of a battery pack according to the present invention; FIG. 4 is a perspective view schematically showing the state in which a lid is installed on the upper side of the main frame of FIG. 2; FIG. 5 is a perspective view schematically showing the structure of the flow space of the lid when the VV line of FIG. 4 is cut open; FIG. 6 is a cross-sectional view schematically showing the state in which the VI-VI line of the battery pack of FIG. 3 is cut open; and FIG. 7 is a perspective view schematically showing the direction of gas flow in the side beam according to the present invention.

[0048] 1 to 7, a battery pack 10 according to an embodiment of the present invention includes a main frame 20, a side beam 25, and a lid 30.

[0049] The main frame 20 has an accommodation space (A) formed therein and is open at the top. The main frame 20 may be formed in the shape of a rectangular parallelepiped as a whole.

[0050] The main frame 20 includes a bottom member 22 and side wall members 23. The rectangular bottom member 22 extends in the width and length directions. The side wall members 23 are connected to the edges of the bottom member 22 and extend upward. That is, the bottom member 22 is formed in the shape of a rectangular panel, and the side wall members 23 are formed in the shape of a rectangular frame.

[0051] The side beams 25 extend in the length direction so as to divide the storage space (A) defined by the bottom member 22 and the side wall members 23 in the width direction. The side beams 25 are erected so as to partition the storage space (A) of the battery modules 50, and have an internal space (I) that communicates with the storage space (A). Gas inlet ports 251 are formed on both sides of the side beams 25 in the width direction so that the storage space (A) and the internal space (I) communicate with each other. The side beams 25 are formed in the shape of a rectangular panel as a whole. The side beams 25 are arranged side by side along the length direction of the main frame 20.

[0052] A center beam 24 is installed in the storage space (A) of the main frame 20 so as to be aligned with the width direction 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 perpendicularly with each other. The center beam 24 divides the storage space (A) in the length direction, and the side beams 25 divide the storage space (A) in the width direction.

[0053] The lid 30 is installed to cover the storage space (A) of the main frame 20, and has a flow space (F) connected to the internal space (I), and a vent outlet 39 connected to the flow space (F). The lid 30 is formed in the shape of a rectangular panel so as to cover the entire upper side of the main frame 20.

[0054] If the battery pack 10 or the battery module 50 catches fire, gas and flame may be generated. In addition, the high-temperature gas and flame may melt materials such as the battery module 50 and the battery cells, causing ejected matter (foreign matter) such as dust to be generated.

[0055] The accommodation space (A), gas inlet 251, internal space (I), flow space (F), and vent outlet 39 are sequentially connected. As a result, gas and thermal energy generated when the battery module 50 ignites can be quickly discharged through the internal space (I) of the side beam 25 and the flow space (F) of the cover 30. That is, the internal space (I) and flow space (F), which are large spaces in the battery pack 10, are utilized to quickly discharge gas and thermal energy, thereby preventing accumulation of thermal energy and an increase in internal pressure within the battery pack 10.

[0056] Furthermore, after the gas and thermal energy from the storage space (A) enter the internal space (I) of the side beam 25, most of the dust mixed in the gas falls to the bottom of the internal space (I) of the side beam 25 as it flows along the length of the side beam 25. Furthermore, because the size of the flow space (F) of the lid 30 is significantly larger than the size of the internal space (I) of the side beam 25, the flow rate of the gas and dust can be rapidly slowed in the flow space (F) of the lid 30, allowing them to diffuse and disperse. As a result, the dust mixed in the gas sinks to the bottom of the flow space (F) of the lid 30, significantly reducing the amount of dust discharged through the vent outlet 39. By reducing the amount of dust discharged through the vent outlet 39, it is possible to suppress the discharge of flames from the battery pack 10.

[0057] In addition, since the size of the flow space (F) of the lid 30 is significantly larger than the size of the internal space (I) of the side beam 25, the internal pressure can be reduced in the flow space (F) of the lid 30, and the concentration of thermal energy can also be dispersed and mitigated.

[0058] Furthermore, since the side beams 25 and the cover 30 are used as passages for discharging gas and heat energy, there is no need to add a separate structure to the battery pack 10 for discharging heat energy and gas.

[0059] As described above, by reducing the amount of dust emissions and lowering the thermal energy and internal pressure, the structure of the battery module 50 and the battery pack 10 can be prevented from collapsing.

[0060] The gas inlet 251 is disposed at a predetermined height (G: see FIG. 6 ) higher than the upper end of the battery module 50. In this case, at least two gas inlets 251 may be disposed above the side beam 25 along the length of the side beam 25. By disposing the gas inlet 251 higher than the upper end of the battery module 50, dust generated in the battery module 50 can be blocked around the gas inlet 251 and guided to sink further toward the upper end surface of the battery module 50. This makes it possible to prevent dust generated when the battery module 50 catches fire from being discharged to the outside of the battery pack 10.

[0061] The side beam 25 may further include an internal partition 253 that separates the internal space (I) in the width direction. The internal partition 253 separates the internal space (I) of the side beam 25 into two spaces, thereby preventing gas, dust, heat energy, and flames from a specific storage space (A) from flowing into the internal space (I) and then flowing to the adjacent storage space (A) and battery module 50. In addition, adjacent battery modules 50 can be prevented from transmitting flames to each other.

[0062] A lower pocket (P) communicating with the internal space (I) may be formed below the internal space (I) of the side beam 25. A chute member 255 may be formed between the internal space (I) and the lower pocket (P). This allows dust flowing into the internal space (I) of the side beam 25 to ride down on the chute member 255 and accumulate below the lower pocket (P). Furthermore, because the chute member 255 is disposed between the internal space (I) and the lower pocket (P), it is possible to prevent dust immersed in the lower pocket (P) from floating upward and further rising into the internal space (I).

[0063] The chute member 255 includes a first chute portion 255a and a second chute portion 255b.

[0064] The first chute portion 255a is disposed below the gas inlet 251 and is formed obliquely downward on the widthwise center side of the inner surface of the side beam 25. At least one first chute portion 255a may be provided below the gas inlet 251.

[0065] The second chute section 255b is formed obliquely downward from the internal partition wall 253 of the side beam 25 toward the inner surface of the side beam 25. At least one second chute section 255b may be installed below the first chute section 255a. The first chute section 255a and the second chute section 255b are arranged obliquely downward in opposite directions. This allows dust falling at the gas inlet 251 to slide on the surfaces of the first chute section 255a and the second chute section 255b and be immersed in the lower pocket (P). Furthermore, even if the dust immersed in the lower pocket (P) floats upward, it is blocked by the first chute section 255a and the second chute section 255b, preventing it from flowing upward.

[0066] The first chute portion 255a may be spaced apart from the internal partition wall 253, and the second chute portion 255b may be spaced apart from the inner surface of the side beam 25. In this case, the passage of the first chute portion 255a and the passage of the second chute portion 255b are arranged on opposite sides to each other, so that the first chute portion 255a and the second chute portion 255b can form a passage through which dust can fall downward while blocking the internal space (I) of the side beam 25.

[0067] The lower inlet 31 of the lid 30 is disposed toward the center of the lid 30, and the vent outlet 257 is disposed at the end in the longitudinal direction of the lid 30. As a result, the distance between the lower inlet 31 and the vent outlet 257 is the greatest, thereby forming a long flow path through which gas and dust move in the flow space (F) of the lid 30. Furthermore, dust mixed in the gas may accumulate in a relatively large amount in the flow space (F) of the lid 30.

[0068] An upper outlet 257 is provided on the top surface of one longitudinal end of the side beam 25, and a lower inlet 31 is provided on the bottom surface of the lid 30 at a position opposite the upper outlet 257. The upper outlet 257 and the lower inlet 31 connect the internal space (I) of the side beam 25 to the flow space (F) of the lid 30. As a result, gas and dust in the internal space (I) of the side beam 25 flow into the flow space (F) of the lid 30 through the upper outlet 257 and the lower inlet 31.

[0069] Figure 5 is a perspective view schematically showing the structure of the flow space of the lid when the VV line of Figure 4 is cut, Figure 6 is a cross-sectional view schematically showing the VI-VI line of the battery pack of Figure 3 when cut, Figure 7 is a perspective view schematically showing the gas flow direction in the side beam of the present invention, Figure 8 is a cross-sectional view schematically showing the VIII-VIII line of the battery pack of Figure 3 when cut, Figure 9 is a plan view schematically showing the gas flow state in the flow space of the lid of the present invention, and Figure 10 is a perspective view schematically showing the state in which gas is discharged from the vent outlet of the lid of the present invention.

[0070] 5 to 10, at least one flow partition 33 may be installed in the flow space (F) of the lid 30, extending in the width direction of the lid 30 and partially blocking the flow space (F) in the length direction to form a flow passage. In this case, the flow partition 33 is formed to a height that can connect the upper and lower surfaces of the flow space (F) of the lid 30.

[0071] The case where a plurality of flow partitions 33 are arranged in the flow space (F) of the cover 30 will be described below.

[0072] The odd-numbered flow partitions 33 at the lower inlet 31 may have both ends separated from both sides of the lid 30 in the width direction. The even-numbered flow partitions 33 at the lower inlet 31 may have both ends connected to both sides of the lid 30 in the width direction, with the center separated.

[0073] Furthermore, the odd-numbered flow partitions 33 at the lower inlet 31 may have both ends connected to both sides of the lid 30 in the width direction and have a separate center. The even-numbered flow partitions 33 at the lower inlet 31 may have both ends separated from both sides of the lid 30 in the width direction.

[0074] Accordingly, the plurality of flow partitions 33 can form a zigzag flow passage in the flow space (F) of the cover 30. Of course, the plurality of flow partitions 33 can form various types of flow passages in the flow space (F) of the cover 30.

[0075] In addition, while the gas flowing in through the lower inlet 31 flows in the flow space (F) toward the vent outlet 39 of the lid 30, the flow can be guided in the width direction by the flow partition 33.

[0076] The flow partition 33 partially blocks the flow space (F) to change the flow direction of gas, dust, etc. This increases the flow time and flow distance of gas and dust in the flow space (F) of the cover 30. In addition, the increase in the flow time and flow distance of gas and dust increases the amount of dust mixed in the gas that accumulates at the bottom of the flow space (F), minimizing the amount of dust emissions.

[0077] The bottom of the flow space (F) of the lid 30 may have pocket protrusions 35 protruding upward across the flow passage. A plurality of pocket protrusions 35 may be installed on each pair of flow partition walls 33. The height of the pocket protrusions 35 is formed lower than the height of the flow partition walls 33. The pocket protrusions 35 act as flow resistance to the gas and dust flowing along the flow passage, so that dust can accumulate in the pocket spaces between the pocket protrusions 35. Since the pocket protrusions 35 are arranged in a row between a pair of adjacent flow partition walls 33, even if dust accumulates in each pocket space, the total amount of accumulated dust can be significantly increased by increasing the number of pocket protrusions 35. This significantly reduces the amount of dust discharged through the vent outlet 39.

[0078] The flow partition walls 33 are formed side by side in the width direction of the lid 30, and the pocket protrusions 35 are formed side by side in the length direction of the lid 30. In this case, the pocket protrusions 35 may be arranged perpendicular to the flow partition walls 33. Of course, the pocket protrusions 35 may also be arranged diagonally to the flow partition walls 33.

[0079] According to the present invention, gas generated when the battery module 50 ignites flows into the internal space (I) of the side beam 25 through the gas inlet 251 in the upper space of the battery module 50 in the accommodation space (A). The gas in the internal space (I) flows along the length of the internal space (I) of the side beam 25 and flows into the flow space (F) of the lid 30 through the upper outlet 257 and the lower inlet 31. The gas in the flow space (F) of the lid 30 passes through the flow space (F) of the lid 30 and is discharged to the outside through the vent outlet 39.

[0080] Furthermore, according to the present invention, when the battery module 50 ignites, dust mixed in the gas clogs the area around the gas inlet 251, thereby being primarily removed. Furthermore, the dust that passes through the gas inlet 251 falls into the lower pocket (P) of the side beam 25, thereby being secondarily removed. The dust in the internal space (I) of the side beam 25 is thirdly removed as it flows along the flow space (F) of the lid 30. This prevents the gas flow path of the battery pack 10 from being narrowed or clogged by dust generated when the battery module 50 ignites.

[0081] In addition, since the gas flow passage can be prevented from being blocked, a sudden 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 the risk of fire can be reduced by preventing the collapse from causing a fire to be discharged to the outside.

[0082] Although the present invention has been described above with reference to illustrative drawings, it is clear that the present invention is not limited to the embodiments and drawings disclosed in this specification, and that various modifications can be made by those skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configurations of the present invention are not explicitly described in the above-described embodiments of the present invention, it is natural that the effects that can be predicted by the configurations should also be recognized. [Explanation of symbols]

[0083] 10 Battery pack 20 Mainframe A. Containment space 22 Bottom member 23 Side wall member 24 Center beam 25 Side beam I Interior space 251 Gas inlet 253 Internal bulkhead 255 Chute member 255a 1st chute 255b Second chute 257 Upper outlet P Lower pocket 30 Lid F Flow space 31 Lower inlet 33 Flow bulkhead 35 Pocket protrusion 39 Vent outlet 50 Battery Module G Height

Claims

1. a main frame having an opening at the top and forming a space for accommodating the battery module; side beams erected to partition the storage space, each having an internal space communicating with the storage space, with gas inlets formed on both sides in the width direction of the side beams so that the storage space and the internal space communicate with each other; and a cover disposed to cover the accommodation space of the main frame, the cover having a flow space connected to the inner space, and a vent outlet connected to the flow space; Including, The gas inlet is disposed at a position higher than an upper end of the battery module by a predetermined height. Battery pack.

2. The side beam further includes an internal partition wall that separates the internal space in the width direction. The battery pack according to claim 1 .

3. A lower pocket communicating with the internal space is formed in a lower portion of the internal space of the side beam, A chute member is formed between the internal space and the lower pocket.

3. The battery pack according to claim 1 or 2.

4. The chute member is a first chute portion disposed below the gas inlet and obliquely formed downward on the inner surface of the side beam toward the center in the width direction; a second chute portion formed obliquely downward on the inner surface of the side beam in the inner partition wall of the side beam; Including, The battery pack according to claim 3 .

5. The first chute portion is spaced apart from the internal partition wall, The second chute portion is spaced apart from the inner surface of the side beam. The battery pack according to claim 4 .

6. The dust in the internal space rides on the chute member and descends, accumulating in the lower pocket. The chute member prevents dust in the lower pocket from rising into the internal space. The battery pack according to claim 3 .

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

8. While the gas flowing into the flow space flows within the flow space toward the vent outlet of the lid, the flow is guided in the width direction by the flow partition. The battery pack according to claim 7.

9. A pocket protrusion is formed at the bottom of the flow space of the lid, crossing the flow passage and protruding upward. The battery pack according to claim 7.

10. The flow partition walls are formed side by side in the width direction of the lid, The pocket protrusions are formed in a line in the length direction of the lid. The battery pack according to claim 9.

11. The pocket convex portion guides dust mixed in the gas so that it accumulates in a pocket space partitioned by the pocket convex portion. The battery pack according to claim 9.

12. The lower inlet of the lid is disposed on the central side of the lid, the vent outlet is located at a longitudinal end of the lid; The battery pack according to claim 1 .

13. An upper outlet is provided on an upper surface of one end of the side beam in the longitudinal direction, a lower inlet is provided at a position facing the upper outlet on the bottom surface of the lid; The upper outlet and the lower inlet connect the internal space of the side beam to the flow space of the lid. The battery pack according to claim 1 .

14. gas generated in the battery module flows into the internal partition wall of the side beam through the gas inlet in an upper space of the battery module of the accommodating space, flows along the length direction of the internal space of the side beam, flows into the flow space of the lid through the upper outlet and the lower inlet, passes through the flow space of the lid, and is discharged to the outside through the vent outlet; The battery pack of claim 13.

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