Battery pack

Abstract

The present invention discloses a battery pack including a case having an open top and providing an interior space, battery cells accommodated in the case, a pack cover coupled to the top of the case and covering the battery cells, and a vent guide for opening and closing a gap between the pack cover and the battery cells.

Description

[Technical Field]

[0001] The present invention relates to a battery pack.

[0002] This application claims priority based on Korean Patent Application No. 10-2023-0137992, filed on October 16, 2023, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings thereof. [Background technology]

[0003] As demand for portable electronic products such as laptops, video cameras, and mobile phones has grown rapidly and the commercialization of robots and electric vehicles has progressed in earnest, research into high-performance secondary batteries that can be repeatedly charged and discharged has been actively conducted.

[0004] Currently, commercially available secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are attracting attention due to their advantages of being able to be freely charged and discharged since they have almost no memory effect compared to nickel-based secondary batteries, an extremely low self-discharge rate, and a high energy density.

[0005] Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as positive and negative electrode active materials, respectively, and include an electrode assembly in which a positive electrode plate coated with the positive electrode active material and a negative electrode plate coated with the negative electrode active material are disposed with a separator interposed therebetween, and an exterior material, such as a battery case, that hermetically houses the electrode assembly together with an electrolyte.

[0006] Generally, lithium secondary batteries can be classified into can-type secondary batteries in which an electrode assembly is housed in a metal can and pouch-type secondary batteries in which an electrode assembly is housed in a pouch made of an aluminum laminate sheet, depending on the shape of the exterior material.

[0007] In recent years, secondary batteries have been widely used for driving and storing energy not only in small devices such as portable electronic devices but also in medium- to large-sized devices such as electric vehicles and energy storage systems (ESS). A plurality of such secondary batteries are electrically connected and housed together inside a module case to form a battery module. A plurality of such battery modules are connected to form a battery pack.

[0008] However, when multiple secondary batteries (battery cells) or multiple battery modules are densely packed in a small space, they may be vulnerable to thermal events. In particular, if an event such as thermal runaway occurs in one battery cell, high-temperature gas, flames, and heat may be generated. If such gas, flame, or heat spreads to other battery cells in the same battery module, an explosive chain reaction such as thermal propagation may occur. Furthermore, such a chain reaction may not only cause accidents such as fire or explosion in the battery module itself, but also cause fires or explosions in other battery modules.

[0009] Furthermore, in the case of medium- to large-sized battery packs, such as those used in electric vehicles, the risk of a chain reaction of thermal reactions may be even higher because they include a large number of battery cells and battery modules in order to increase output and / or capacity. Furthermore, in the case of a battery pack installed in an electric vehicle, users such as the driver may be present nearby. Therefore, if a thermal event occurring in a specific battery cell or module is not properly controlled and a chain reaction occurs, it may result in significant damage to property and even loss of life. Therefore, it is necessary to improve the thermal safety of the battery pack by properly controlling the thermal event occurring in the battery cell or module. Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention aims to solve the above-mentioned problems and other problems.

[0011] Another object of the present invention is to provide a battery pack with improved electrical safety when a thermal event occurs.

[0012] It is yet another object of the present invention to provide a battery pack that can suppress heat propagation by providing directionality to the flow of vent gas when a thermal event occurs.

[0013] It is yet another object of the present invention to provide a battery pack that includes a structure that allows for the rapid evacuation of vent gases, pyrotechnic particles, flames, and the like in the event of a thermal event.

[0014] It is yet another object of the present invention to provide a battery pack that allows for easily controllable venting when a thermal event occurs. [Means for solving the problem]

[0015] In order to solve the above problems, a battery pack according to one aspect of the present invention includes a case having an open top and providing an internal space, battery cells housed in the case, a pack cover coupled to the top of the case and covering the battery cells, and a vent guide that opens and closes a gap between the pack cover and the battery cells.

[0016] The vent guide may also include a flexible material.

[0017] The vent guide may be configured to be foldable.

[0018] Additionally, the vent guide may contact the pack cover at an angle.

[0019] The vent guide may also be configured to allow flow in one direction when folded and restrict flow in the opposite direction when unfolded.

[0020] The battery pack may further include a vent device provided on one side of the case and positioned in the one direction.

[0021] The battery pack may further include a module case positioned in the interior space of the case and accommodating the battery cells.

[0022] The vent guide may include a fixing portion fixed to one side of the module case, and an opening / closing portion extending upward from the fixing portion to open and close the gap.

[0023] The extension length of the opening / closing portion may be longer than the height between the module case and the pack cover.

[0024] The opening / closing portion can cover the top surface of the module case.

[0025] The module case may also have a vent hole formed on the top surface.

[0026] The battery pack may further include a partition wall that defines an internal space of the case.

[0027] The fixing portion may be located between the module case and the partition wall.

[0028] The battery pack may further include a spacer disposed on an upper end of the partition wall.

[0029] The pack cover may also be coupled to the spacer.

[0030] A motor vehicle according to another aspect of the present invention includes a battery pack according to an aspect of the present invention. [Effects of the Invention]

[0031] According to one aspect of the present invention, the thermal safety of a battery pack can be improved.

[0032] According to one aspect of the present invention, heat propagation can be suppressed.

[0033] According to one aspect of the present invention, directionality can be imparted to the flow of vent gas.

[0034] According to one aspect of the present invention, venting of a battery pack can be easily controlled.

[0035] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention, are intended to facilitate a further understanding of the technical concept of the present invention. Therefore, the present invention should not be analyzed limitedly by the matters described in the drawings. [Brief explanation of the drawings]

[0036] [Figure 1] 1 is a diagram illustrating a battery pack according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded view showing a partial configuration of the battery pack of FIG. 1. [Figure 3] 2 is a diagram showing a battery module included in the battery pack of FIG. 1. [Figure 4] 1A and 1B are diagrams illustrating a vent guide of a battery pack according to an embodiment of the present invention. [Figure 5] 1A and 1B are diagrams illustrating a vent guide of a battery pack according to an embodiment of the present invention. [Figure 6] 10A and 10B are diagrams illustrating folding of a vent guide of a battery pack according to an embodiment of the present invention. [Figure 7] FIG. 2 is an exploded view showing a partial configuration of the battery pack of FIG. 1. [Figure 8]FIG. 10 is a diagram showing a battery pack with a vent guide attached. [Figure 9] FIG. 9 is an enlarged view of part B in FIG. 8. [Figure 10] FIG. 2 is a diagram showing a cross-sectional configuration along the line AA' in FIG. [Figure 11] FIG. 11 is an enlarged view of part C in FIG. [Figure 12] FIG. 11 is an enlarged view of part C in FIG. 10 when a thermal event occurs. [Figure 13] FIG. 11 is a diagram showing the flow of vent gas in part C of FIG. [Figure 14] FIG. 11 is an enlarged view of part D in FIG. [Figure 15] FIG. 11 is an enlarged view of part E in FIG. 10. [Figure 16] FIG. 2 is a diagram showing a modified cross-sectional configuration taken along line AA' in FIG. [Figure 17] FIG. 17 is an enlarged view of part F in FIG. 16. [Figure 18] FIG. 17 is a diagram showing the flow of vent gas in FIG. 16. DETAILED DESCRIPTION OF THE INVENTION

[0037] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in the specification and claims are not interpreted as being limited to their general or dictionary meanings, but are interpreted as having meanings and concepts corresponding to the technical ideas of the present invention, in accordance with the principle that the inventors themselves can appropriately define the concepts of terms in order to best describe the invention.

[0038] Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and that there may be various equivalents and modifications that can replace them at the time of this application.

[0039] Fig. 1 is a diagram showing a battery pack according to an embodiment of the present invention, and Fig. 2 is an exploded view showing a portion of the battery pack of Fig. 1. Referring to Fig. 1 and Fig. 2, the battery pack according to an embodiment of the present invention may include a case 100, a battery cell 220, a pack cover 500, and a vent guide 700.

[0040] The case 100 may be rectangular. The case 100 may have an open top. The case 100 may provide a space inside. The case 100 may include a base plate 110 and a side wall 120. The base plate 110 may be rectangular. The side wall 120 may be fastened, coupled, or fixed to an upper surface of the base plate 110. The side wall 120 may extend along the periphery of the base plate 110.

[0041] A plurality of battery cells 220 (see FIGS. 10 to 18) may be provided. The battery cells 220 may refer to secondary batteries. The battery cells 220 may be pouch-shaped. The battery cells 220 may be housed in a space provided by the case 100. The battery cells 220 may extend in the left-right direction or the Y-axis direction. The plurality of battery cells 220 may be arranged, stacked, or aligned in the front-rear direction or the X-axis direction.

[0042] The pack cover 500 may be rectangular. The pack cover 500 may be plate-shaped. The pack cover 500 may be coupled to the opening of the case 100. The pack cover 500 may be coupled to the top surface of the case 100. The pack cover 500 may cover the top surface of the case 100. The pack cover 500 may also be coupled, fixed, or fastened to the side wall 120.

[0043] The vent guide 700 can open and close the gap between the pack cover 500 and the battery cell 220. The gap between the pack cover 500 and the battery cell 220 can function as a flow path through which the vent gas g flows. The vent guide 700 can open and close the flow path through which the vent gas g flows. The vent guide 700 can impart directionality to the flow of the vent gas g. For example, the vent guide 700 can guide the vent gas g to flow in one direction and can prevent the vent gas g from flowing back.

[0044] According to this embodiment, the venting of the battery pack can be easily controlled. The vent guide 700 can impart directionality to the flow of the vent gas g. The vent guide 700 prevents the backflow of the vent gas g, thereby blocking or suppressing heat transfer to the adjacent battery module 200. This improves the thermal safety of the battery pack.

[0045] 1 and 2 , a battery pack according to an embodiment of the present invention may include a partition wall 300. The partition wall 300 may divide an internal space into a plurality of spaces, and a plurality of battery cells 220 may be housed in the spaces divided by the partition wall 300.

[0046] FIG. 3 is a diagram showing a battery module 200 included in the battery pack of FIG. 1. Referring to FIGS. 1 to 3, a battery pack according to an embodiment of the present invention may include a plurality of battery modules 200. Each battery module 200 may include a module case 210 and a plurality of battery cells 220. The module case 210 may have a rectangular parallelepiped shape. The module case 210 may provide a space therein. Each battery module 200 may include a plurality of battery cells 220. The plurality of battery cells 220 may be accommodated inside the module case 210. The battery modules 200 may be accommodated in a space partitioned by a partition wall 300.

[0047] According to the present embodiment, the battery pack can improve its output by including a plurality of battery modules 200. In addition, the state of the battery cells 220 is monitored for each battery module 200, thereby improving the management efficiency of the battery pack.

[0048] 1 to 3, a plurality of battery modules 200 included in a battery pack according to an embodiment of the present invention may be configured to be vented upward. For example, a module case 210 may have a vent hole 211 formed on an upper surface thereof.

[0049] Alternatively, the module case 210 may include a notch line on the top surface thereof. When the internal pressure of the battery module 200 increases, at least a portion of the module case 210 may separate along the notch line to form the vent hole 211.

[0050] According to this embodiment, the venting of the battery pack can be easily controlled. The vent gas g discharged from the battery module 200 flows into the gap between the module case 210 and the pack cover 500. The vent gas g that flows into the gap is guided by the vent guide 700.

[0051] 4 and 5 are diagrams showing a vent guide 700 of a battery pack according to an embodiment of the present invention, and FIG. 6 is a diagram showing the folding of the vent guide 700 of a battery pack according to an embodiment of the present invention. Referring to FIGS. 4 to 6, the vent guide 700 according to an embodiment of the present invention may include a flexible material. At least a portion of the vent guide 700 may be folded or bent.

[0052] According to this embodiment, the vent guide 700 includes a flexible material, so that the gap between the module case 210 and the pack cover 500 can be easily opened and closed.

[0053] 4 to 6, a vent guide 700 according to an embodiment of the present invention may be configured to be foldable. The vent guide 700 may be plate-shaped. The vent guide 700 may include a fixing portion 710 that is fixed to the inside of a battery pack. The fixing portion 710 may be rectangular plate-shaped. The opening / closing portion 720 may extend from the fixing portion 710. The opening / closing portion 720 may extend upward from the fixing portion 710 or in the +Z-axis direction. Alternatively, the opening / closing portion 720 may extend obliquely upward from the fixing portion 710. The vent guide 700 may include a fold line fl formed between the opening / closing portion 720 and the fixing portion 710. The opening / closing portion 720 may pivot about the fold line fl.

[0054] According to this embodiment, the gap between the module case 210 and the pack cover 500 can be opened by folding the opening / closing part 720. Furthermore, the gap between the module case 210 and the pack cover 500 can be closed by unfolding the opening / closing part 720. The vent guide 700 can allow the flow of the vent gas g by folding the opening / closing part 720. Furthermore, the vent guide 700 can prevent the backflow of the vent gas g by unfolding the opening / closing part 720.

[0055] 4 to 6, the vent guide 700 of the battery pack according to one embodiment of the present invention may include a material having high heat resistance or high fire resistance, so that the vent guide 700 will not be damaged even when exposed to high-temperature vent gas g or ignitable particles f.

[0056] In addition, the vent guide 700 can be configured to be thin, with a thickness of 1 mm or less, so that the battery module 200 can be attached to the battery pack while maintaining assembly.

[0057] 7 is an exploded view of a portion of the battery pack of FIG. 1, FIG. 8 is a view showing a battery pack with a vent guide 700 attached, FIG. 9 is an enlarged view of part B of FIG. 8, FIG. 10 is a view showing a cross-sectional configuration along A-A' of FIG. 1, and FIG. 11 is an enlarged view of part C of FIG. 10.

[0058] 7 to 11, a battery pack according to an embodiment of the present invention may further include a spacer 400. The spacer 400 may be provided on an upper end of the partition wall 300. A plurality of spacers 400 may be provided. A pack cover 500 may be coupled to the spacer 400.

[0059] The partition wall 300 may include a first partition wall 310. The first partition wall 310 may extend in the left-right direction or the Y-axis direction. A plurality of first partition walls 310 may be provided. The plurality of first partition walls 310 may be arranged, aligned, or positioned along the front-rear direction or the X-axis direction. Battery modules 200 may be positioned between adjacent first partition walls 310 and between the first partition walls 310 and the side wall 120.

[0060] The spacer 400 may include a first spacer 410 provided on the first partition wall 310. A plurality of first spacers 410 may be provided. One first partition wall 310 may include a pair of first spacers 410.

[0061] The spacer 400 may also include a second spacer 420 provided on the second partition wall 320. A plurality of second spacers 420 may be provided.

[0062] According to this embodiment, the thermal safety of the battery pack can be improved. A gap can be formed between the partition wall 300 and the pack cover 500 by the spacer 400. When a thermal event occurs, vent gas g, ignitable particles f, or flames discharged from the battery cells 220 flow through the gap between the partition wall 300 and the pack cover 500 and are discharged to the outside of the battery pack.

[0063] 7 to 11, a vent guide 700 according to an embodiment of the present invention may be fixed to one side of a module case 210. A fixing portion 710 of the vent guide 700 may be coupled, fixed, fastened, or attached to one side of the module case 210. The fixing portion 710 may cover one side of the module case 210. The fixing portion 710 may be provided on one side of the module case 210.

[0064] According to this embodiment, it is possible to stably support or fix the vent guide 700. This allows the opening / closing part 720 to operate stably, and improves the thermal safety of the battery pack.

[0065] 7 to 11, the extension length of the opening / closing part 720 according to one embodiment of the present invention may be longer than the height between the module case 210 and the pack cover 500. The opening / closing part 720 may extend obliquely from the fixing part 710. This allows the opening / closing part 720 to be folded in only one direction. For example, the opening / closing part 720 is folded in a direction closer to the top surface of the module case 210. Furthermore, the opening / closing part 720 is not folded in a direction away from the module case 210.

[0066] According to this embodiment, the vent guide 700 is configured to be foldable in only one direction, thereby imparting directionality to the flow of the vent gas g. Furthermore, the vent guide 700 can block or suppress heat transfer to the adjacent battery module 200 by preventing the backflow of the vent gas g. This can improve the thermal safety of the battery pack.

[0067] 7 to 11, an opening / closing unit 720 according to an embodiment of the present invention may cover the top surface of the module case 210. The opening / closing unit 720 may cover the top surface of the module case 210 in a folded or unfolded state. The opening / closing unit 720 may also be folded to come into contact with the top surface of the module case 210.

[0068] According to this embodiment, the open / close part 720 can extend long enough from the fixed part 710 to cover the upper surface of the module case 210. This allows the vent guide 700 to impart directionality to the flow of the vent gas g.

[0069] 7 to 11 , the vent guide 700 according to an embodiment of the present invention may be in oblique contact with the pack cover 500. The upper end or upper edge of the opening / closing portion 720 may be in contact with the lower surface of the pack cover 500. The opening / closing portion 720 may be in contact with the pack cover 500 while closing the gap between the module case 210 and the pack cover 500. In addition, the opening / closing portion 720 may be released from contact with the pack cover 500 while opening the gap between the module case 210 and the pack cover 500.

[0070] According to this embodiment, the backflow of the vent gas g can be more reliably blocked or suppressed by the opening / closing part 720 coming into contact with the pack cover 500. This makes it possible to suppress heat propagation in the battery pack.

[0071] 7 to 11, a vent guide 700 of a battery pack according to an embodiment of the present invention may be located between a partition wall 300 and a module case 210. The partition wall 300 may define an internal space of the case 100. The partition wall 300 may be disposed along a side of the battery module 200. The fixing portion 710 may be coupled, fastened, fixed, attached, or located between one side of the module case 210 and the partition wall 300. The fixing portion 710 may be coupled, fastened, fixed, attached, or located on one side of the module case 210 or one side of the partition wall 300.

[0072] According to this embodiment, it is possible to stably support or fix the vent guide 700. This allows the opening / closing part 720 to operate stably, and improves the thermal safety of the battery pack.

[0073] 12 is an enlarged view of portion C in FIG. 10 when a thermal event occurs. Referring to FIG. 12, when a thermal event occurs in the battery cell 220 or the battery module 200, vent gas (g) and ignitable particles (f) may be discharged upward or in the Z-axis direction through the vent hole 211 of the battery module 200. The vent gas (g) and ignitable particles (f) that flow into the gap between the module case 210 and the pack cover 500 may flow in the +X-axis direction and the -X-axis direction. Alternatively, the vent gas (g) and ignitable particles (f) that flow into the gap between the module case 210 and the pack cover 500 may flow in the front-rear direction.

[0074] Fig. 13 is a diagram showing the flow of vent gas (g) in part C of Fig. 10. Referring to Fig. 13, the vent gas (g) and the ignitable particles (f) may fold the opening / closing portion 720 of the vent guide 700 located in front of the battery module 200 where the thermal event occurred. When the opening / closing portion 720 is folded, the gap between the module case 210 and the pack cover 500 is opened, allowing the vent gas (g) and the ignitable particles (f) to move forward or in the +X-axis direction.

[0075] Meanwhile, the vent gas (g) and ignitable particles (f) flowing backward or in the -X-axis direction may collide with the opening / closing unit 720 of the vent guide 700 provided in the battery module 200 where the thermal event occurred. At this time, the opening / closing unit 720 of the vent guide 700 remains closed. This can block or suppress the flow of the vent gas (g) and ignitable particles (f) in the -X-axis direction.

[0076] In addition, by blocking or suppressing the flow of vent gas g and ignitable particles f in the -X axis direction, the transfer of radiant heat and convective heat through the vent holes 211 of adjacent battery modules 200 can be prevented.

[0077] 12 and 13, the vent guide 700 of the battery pack according to an embodiment of the present invention may be configured to allow flow in one direction when folded and restrict flow in the opposite direction when unfolded. For example, the vent guide 700 may allow flow in the +X-axis direction and restrict flow in the -X-axis direction.

[0078] According to this embodiment, the vent guide 700 is configured to be foldable in only one direction, thereby imparting directionality to the flow of the vent gas g. Furthermore, the vent guide 700 can block or suppress heat transfer to the adjacent battery module 200 by preventing the backflow of the vent gas g. This can improve the thermal safety of the battery pack.

[0079] 7 to 13, a battery pack according to an embodiment of the present invention may include a plurality of vent guides 700. A vent guide 700 may be provided for each battery module 200. Furthermore, the plurality of vent guides 700 may be provided in a folded or bent state in the same direction.

[0080] According to this embodiment, even if a thermal event occurs in any of the battery modules 200, the vent gas g and the ignitable particles f flow only in the +X-axis direction, thereby blocking or suppressing the heat propagation in the battery pack.

[0081] FIG. 14 is an enlarged view of portion D in FIG. 10, and FIG. 15 is an enlarged view of portion E in FIG. 10. Referring to FIGS. 14 and 15, a battery pack according to an embodiment of the present invention may further include a vent device 600 provided on one side of the case 100 and positioned in one direction. The vent device 600 may discharge gas inside the case 100 to the outside when the internal pressure of the battery pack increases. For example, the vent device 600 may be provided on the front side wall 120. Vent gas (g) flowing in the +X-axis direction or forward may be discharged to the outside of the case 100 through the vent device 600. At this time, the discharge of ignitable particles (f) flowing in the +X-axis direction or forward to the outside of the case 100 is suppressed or blocked by the vent device 600.

[0082] According to this embodiment, the vent gas g is prevented from flowing back and is discharged through the vent device 600, thereby minimizing heat transfer, thereby improving the thermal safety of the battery pack.

[0083] 14, vent gas (g) and ignitable particles (f) generated in battery module 200b may flow in the +X-axis direction by folding vent guide 700a provided in battery module 200a located in the front. In addition, vent gas (g) may be discharged to the outside through vent device 600. In addition, the flow of vent gas (g) and ignitable particles (f) in the -X-axis direction may be blocked or suppressed by vent guide 700b. This may suppress or block heat transfer to battery module 200c located in the rear.

[0084] 15, vent gas (g) generated in the battery module 200a may be discharged to the outside through the vent device 600. In addition, the flow of the vent gas (g) and ignitable particles (f) in the -X-axis direction may be blocked or suppressed by the vent guide 700a, thereby suppressing or blocking heat transfer to the battery module 200b located behind the battery module 200a.

[0085] Fig. 16 is a diagram showing a modified cross-sectional configuration along A-A' in Fig. 1, Fig. 17 is an enlarged view of portion F in Fig. 16, and Fig. 18 is a diagram showing the flow of vent gas in Fig. 16. Referring to Figs. 16 to 18, a battery pack according to an embodiment of the present invention may include vent devices 600 provided on the front side wall 120 and the rear side wall 120, respectively. In this case, a plurality of vent guides 700a, 700b, 700c, and 700d may be provided so that vent gas g is discharged from the nearest vent device 600.

[0086] For example, the vent guides 700a, 700b provided on the battery modules 200a, 200b may be folded or bent toward the +X-axis direction, so that the vent gas g generated in the battery modules 200a, 200b may be discharged through the vent device 600 provided on the front side wall 120.

[0087] In addition, the vent guides 700c, 700d provided on the battery modules 200c, 200d may be folded or bent toward the −X-axis direction, so that the vent gas g generated in the battery modules 200c, 200d may be discharged through the vent device 600 provided on the rear side wall 120.

[0088] In addition, the battery pack according to an embodiment of the present invention may further include various components, such as a battery management system (BMS), bus bars, relays, current sensors, and other battery pack components known at the time of filing of the present invention.

[0089] A vehicle according to an embodiment of the present invention includes the battery pack according to the embodiment of the present invention described above. The battery pack according to an embodiment of the present invention may be applied to vehicles such as electric vehicles and hybrid vehicles. In addition to the battery pack, the vehicle according to an embodiment of the present invention may further include various other components included in the vehicle, such as a body, a motor, and a control device such as an electronic control unit (ECU).

[0090] Meanwhile, although terms indicating directions such as up, down, left, right, front, and rear are used in this specification, it will be obvious to those skilled in the art that these terms are used for the convenience of explanation and may vary depending on the position of the object or the position of the observer, etc.

[0091] As described above, the present invention has been described using limited embodiments and drawings, but the present invention is not limited thereto, and it goes without saying that various changes and modifications can be made by a person having ordinary knowledge in the technical field to which the present invention pertains within the technical spirit of the present invention and the equivalent scope of the claims. [Explanation of symbols]

[0092] 100 cases 110 base plate 120 Side wall 200 Battery Module 200a battery module 200b battery module 200c Battery Module 200d Battery Module 210 Module Case 211 Vent hole 220 battery cells 300 Partition Wall 310 First Partition Wall 320 Second Partition Wall 400 spacer 410 First spacer 420 Second spacer 500 pack covers 600 Vent Device 700 Vent Guide 700a Vent Guide 700b Vent Guide 700c bent guide 700d Vent Guide 710 Fixed part 720 Opening and Closing Section

Claims

1. A case with an open top that provides internal space, a battery cell housed in the case; a pack cover coupled to an upper surface of the case and covering the battery cells; a vent guide that opens and closes a gap between the pack cover and the battery cell.

2. The battery pack of claim 1 , wherein the vent guide comprises a flexible material.

3. The battery pack according to claim 1 , wherein the vent guide is configured to be foldable.

4. The battery pack according to claim 3 , wherein the vent guide is in contact with the pack cover at an angle.

5. The vent guide is 4. The battery pack of claim 3, configured to allow flow in one direction when folded and restrict flow in a direction opposite said one direction when unfolded.

6. The battery pack according to claim 5 , further comprising a vent device provided on one side of the case and positioned in the one direction.

7. a module case positioned in the interior space of the case and accommodating the battery cell; The vent guide is a fixing portion fixed to one side of the module case; The battery pack according to claim 1 , further comprising: an opening / closing portion extending upward from the fixing portion and opening and closing the gap.

8. The extension length of the opening and closing portion is The battery pack according to claim 7 , wherein the battery pack is longer than the height between the module case and the pack cover.

9. The battery pack according to claim 7 , wherein the opening / closing portion covers an upper surface of the module case.

10. The battery pack according to claim 7 , wherein the module case has a vent hole formed on an upper surface thereof.

11. The case further includes a partition wall that divides an internal space thereof, The fixing portion is The battery pack according to claim 7 , located between the module case and the partition wall.

12. a spacer provided at an upper end of the partition wall; The battery pack of claim 11 , wherein the pack cover is coupled to the spacer.

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

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