Battery pack

Abstract

A battery pack is disclosed. A battery pack according to one embodiment of the present invention may include: a case having an open top surface and providing an internal space; a battery cell accommodated in the case; a pack cover coupled to the top surface of the case and covering the battery cell; and a venting guide that opens and closes a gap between the pack cover and the battery cell.

Description

Technology Field

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

[0002] With the rapid increase in demand for portable electronic products such as laptops, video cameras, and mobile phones, and the full-scale commercialization of robots and electric vehicles, research on high-performance secondary batteries capable of repeated charging and discharging is actively underway.

[0003] Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion batteries are gaining attention for their advantages, such as the ability to charge and discharge freely with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density.

[0004] These lithium secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative active materials, respectively. The lithium secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and an outer casing, namely a battery case, that seals and houses the electrode assembly together with an electrolyte.

[0005] Generally, lithium secondary batteries can be classified according to the shape of the casing into can-type secondary batteries, in which the electrode assembly is embedded in a metal can, and pouch-type secondary batteries, in which the electrode assembly is embedded in a pouch of aluminum laminate sheet.

[0006] Recently, secondary batteries are widely used for driving or energy storage not only in small devices such as portable electronic devices but also in medium-to-large devices such as electric vehicles and Energy Storage Systems (ESS). These secondary batteries can form a single battery module by housing multiple batteries together inside a module case while electrically connected. Furthermore, multiple such battery modules can be connected to form a single battery pack.

[0007] However, when multiple secondary batteries (battery cells) or battery modules are densely packed in a confined space as described above, they may be vulnerable to thermal events. In particular, if an event such as thermal runaway occurs in a single battery cell, high-temperature gases, flames, or heat may be generated. If these gases, flames, or heat are transferred to other battery cells within the same battery module, an explosive chain reaction situation, such as thermal propagation, may occur. Furthermore, such a chain reaction can not only cause accidents such as fire or explosion in the affected battery module but also trigger fires or explosions in other battery modules.

[0008] Furthermore, in the case of medium to large battery packs, such as those found in electric vehicles, the inclusion of a large number of battery cells and modules to increase output and / or capacity can significantly increase the risk of thermal chain reactions. Moreover, in the case of battery packs installed in electric vehicles, users such as drivers may be present nearby. Therefore, if a thermal event originating from a specific battery cell or module is not properly controlled and triggers a chain reaction, it can result in not only significant property damage but also loss of life. Consequently, it is necessary to enhance the thermal safety of the battery pack by properly controlling thermal events generated from battery cells or modules. The problem to be solved

[0009] The present invention aims to solve the aforementioned problems and other problems.

[0010] Another objective of the present invention may be to provide a battery pack with improved electrical safety in the event of a thermal event.

[0011] Another objective of the present invention may be to provide a battery pack capable of suppressing heat propagation by imparting directionality to the venting gas flow when a thermal event occurs.

[0012] Another objective of the present invention may be to provide a battery pack comprising a structure capable of rapidly discharging venting gas, flammable particles, flames, etc., upon the occurrence of a thermal event.

[0013] Another objective of the present invention may be to provide a battery pack that facilitates venting control when a thermal event occurs. means of solving the problem

[0014] A battery pack according to one embodiment of the present invention for achieving the above-mentioned purpose may include: a case having an open top surface and providing an internal space; a battery cell accommodated in the case; a pack cover coupled to the top surface of the case and covering the battery cell; and a venting guide for opening and closing a gap between the pack cover and the battery cell.

[0015] In addition, the venting guide may include a flexible material.

[0016] In addition, the above-mentioned venting guide can be configured to be foldable.

[0017] In addition, the venting guide may be in oblique contact with the pack cover.

[0018] In addition, the venting guide may be configured to allow flow in one direction by folding and to restrict flow in the opposite direction of said one direction by unfolding.

[0019] The battery pack may further include a venting device provided on one side of the case and located in one direction.

[0020] The battery pack may further include a module case located in the internal space of the case and accommodating the battery cell.

[0021] Additionally, the venting guide may include: a fixing part fixed to one side of the module case; and an opening / closing part extending upward from the fixing part and opening / closing the gap.

[0022] In addition, the extended length of the above opening / closing part may be configured to be longer than the height between the module case and the pack cover.

[0023] In addition, the above opening / closing part can cover the upper surface of the module case.

[0024] In addition, the module case may have a venting hole formed on its upper surface.

[0025] The battery pack may further include a partition wall that partitions the internal space of the case.

[0026] In addition, the fixed part may be located between the module case and the partition wall.

[0027] The battery pack may further include a spacer provided at the top of the partition wall.

[0028] In addition, the above pack cover can be coupled to the above spacer.

[0029] An automobile according to one aspect of the present invention includes a battery pack of the present invention. Effects of the invention

[0030] According to at least one of the embodiments of the present invention, the thermal safety of the battery pack can be improved.

[0031] According to at least one of the embodiments of the present invention, heat propagation can be suppressed.

[0032] According to at least one of the embodiments of the present invention, directionality can be imparted to the venting gas flow.

[0033] According to at least one of the embodiments of the present invention, venting control of the battery pack can be facilitated. Brief explanation of the drawing

[0034] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention. Figure 2 is a diagram showing a separated configuration of a battery pack of Figure 1. Figure 3 is a drawing showing a battery module included in the battery pack of Figure 1. FIGS. 4 and FIGS. 5 are drawings showing a venting guide of a battery pack according to one embodiment of the present invention. FIG. 6 is a drawing showing the folding of a venting guide of a battery pack according to one embodiment of the present invention. Figure 7 is a diagram showing a partial configuration of the battery pack of Figure 1 separated. Figure 8 is a drawing showing a battery pack with a venting guide installed. Figure 9 is an enlarged view of part B of Figure 8. Figure 10 is a drawing showing a cross-sectional configuration along the cutting line A-A' of Figure 1. Figure 11 is an enlarged view of section C of Figure 10. Figure 12 is an enlarged view of section C of Figure 10 at the time of a thermal event. Figure 13 is a diagram showing the flow of venting gas in part C of Figure 10. Figure 14 is an enlarged view of section D of Figure 10. Figure 15 is an enlarged view of section E of Figure 10. FIG. 16 is a drawing showing an example of a modified cross-sectional configuration according to the cutting line A-A' of FIG. 1. Figure 17 is an enlarged view of section F of Figure 16. Specific details for implementing the invention

[0035] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0036] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all aspects of the technical concept of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0037] FIG. 1 is a drawing showing a battery pack according to an embodiment of the present invention. FIG. 2 is a drawing showing a partial configuration of the battery pack of FIG. 1 separated. Referring to FIG. 1 and FIG. 2, a 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 venting guide (700).

[0038] The case (100) may have a rectangular shape. The case (100) may have an open top surface. The case (100) may provide space inside. The case (100) may include a base plate (110) and a side wall (120). The base plate (110) may have a rectangular shape. The side wall (120) may be fastened, joined, or fixed to the top surface of the base plate (110). The side wall (120) may extend along the perimeter of the base plate (110).

[0039] A plurality of battery cells (220, see FIGS. 10 to 18) may be provided. A battery cell (220) may refer to a secondary battery. A battery cell (220) may have a pouch shape. Additionally, a battery cell (220) may be accommodated in a space provided by a case (100). A battery cell (220) may be extended in the left-right direction or the Y-axis direction. A plurality of battery cells (220) may be arranged, stacked, or aligned in the front-back direction or the X-axis direction.

[0040] The pack cover (500) may have a rectangular shape. The pack cover (500) may have a plate shape. The pack cover (500) may be attached to an opening of the case (100). The pack cover (500) may be attached to the upper surface of the case (100). The pack cover (500) may cover the upper surface of the case (100). Additionally, the pack cover (500) may be attached, fixed, or fastened to the side wall (120).

[0041] The venting 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 passageway through which venting gas (g) flows. The venting guide (700) can open and close the passageway through which venting gas (g) flows. The venting guide (700) can provide directionality to the flow of venting gas (g). For example, the venting guide (700) can guide the venting gas (g) to flow in one direction and prevent the venting gas (g) from flowing backward.

[0042] According to this configuration of the present invention, venting control of the battery pack can be facilitated. The venting guide (700) can provide directionality to the flow of the venting gas (g). By preventing the venting gas (g) from flowing backward, the venting guide (700) can block or suppress heat propagation to adjacent battery modules (200). As a result, the thermal safety of the battery pack can be improved.

[0043] Referring to FIGS. 1 and 2, a battery pack according to one embodiment of the present invention may include a partition wall (300). The partition wall (300) may partition an internal space. The partition wall (300) may partition the internal space into a plurality of spaces, and a plurality of battery cells (220) may be accommodated in the spaces partitioned by the partition wall (300).

[0044] FIG. 3 is a drawing showing a battery module (200) included in the battery pack of FIG. 1. Referring to FIG. 1 to FIG. 3, a battery pack according to one 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 shape. The module case (210) may provide a space inside. 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 module (200) may be accommodated in a space partitioned by a partition wall (300).

[0045] According to this configuration of the present invention, the battery pack can improve the output of the battery pack by including a plurality of battery modules (200). In addition, the management efficiency of the battery pack can be increased by monitoring the status of the battery cells (220) on a battery module (200) basis.

[0046] Referring to FIGS. 1 to 3, a plurality of battery modules (200) included in a battery pack according to one embodiment of the present invention may be configured to be ventable upward. For example, a module case (210) may have a venting hole (211) formed on its upper surface.

[0047] Alternatively, the module case (210) may include a notching line on its upper surface. As the pressure inside the battery module (200) increases, at least a portion of the module case (210) may be separated along the notching line to form a venting hole (211).

[0048] According to this configuration of the present invention, venting control of the battery pack can be facilitated. Venting gas (g) discharged from the battery module (200) can be introduced into the gap between the module case (210) and the pack cover (500). The venting gas (g) introduced into the gap can be flowed by the venting guide (700).

[0049] FIGS. 4 and 5 are drawings showing a venting guide (700) of a battery pack according to an embodiment of the present invention. FIG. 6 is a drawing showing the folding of the venting guide (700) of a battery pack according to an embodiment of the present invention. Referring to FIGS. 4 to 6, the venting guide (700) according to an embodiment of the present invention may include a flexible material. At least a portion of the venting guide (700) may be folded or bent.

[0050] According to this configuration of the present invention, the venting 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.

[0051] Referring to FIGS. 4 through 6, a venting guide (700) according to one embodiment of the present invention may be configured to be foldable. The venting guide (700) may have a plate shape. The venting guide (700) may include a fixing part (710) that is fixed inside a battery pack. The fixing part (710) may have a square plate shape. An opening / closing part (720) may extend from the fixing part (710). The opening / closing part (720) may extend upward or in the +Z-axis direction from the fixing part (710). Additionally, the opening / closing part (720) may extend obliquely upward from the fixing part (710). The venting guide (700) may include a folding line (fl) formed between the opening / closing part (720) and the fixing part (710). The opening / closing part (720) may pivot around the folding line (fl).

[0052] According to this configuration of the present invention, the gap between the module case (210) and the pack cover (500) can be opened by folding the opening / closing part (720). Additionally, the gap between the module case (210) and the pack cover (500) can be closed by unfolding the opening / closing part (720). The venting guide (700) can allow the flow of venting gas (g) by folding the opening / closing part (720). Additionally, the venting guide (700) can prevent backflow of venting gas (g) by unfolding the opening / closing part (720).

[0053] Referring to FIGS. 4 to 6, a venting guide (700) of a battery pack according to one embodiment of the present invention may include a material having high heat resistance or high fire resistance. As a result, the venting guide (700) may not be damaged even when exposed to high-temperature venting gas (g) or flammable particles (f).

[0054] Additionally, the venting guide (700) can be configured with a thin thickness of 1 mm or less. As a result, it can be installed in the battery pack while maintaining the assembly of the battery module (200).

[0055] FIG. 7 is a diagram showing a separated portion of the battery pack of FIG. 1. FIG. 8 is a diagram showing a battery pack with a venting guide (700) installed. FIG. 9 is an enlarged view of section B of FIG. 8. FIG. 10 is a diagram showing a cross-sectional configuration along the cutting line A-A' of FIG. 1. FIG. 11 is an enlarged view of section C of FIG. 10.

[0056] Referring to FIGS. 7 through 11, a battery pack according to one embodiment of the present invention may further include a spacer (400). The spacer (400) may be provided on the top of the partition wall (300). The spacer (400) may be provided in multiple numbers. A pack cover (500) may be coupled to the spacer (400).

[0057] 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. The first partition wall (310) may be provided in multiple numbers. The multiple first partition walls (310) may be arranged, aligned, or positioned along the front-back direction or the X-axis direction. A battery module (200) may be positioned between adjacent first partition walls (310) and between the first partition wall (310) and the side wall (120).

[0058] The spacer (400) may include a first spacer (410) provided in the first partition wall (310). The first spacer (410) may be provided in multiple numbers. One first partition wall (310) may have a pair of first spacers (410).

[0059] Additionally, the spacer (400) may include a second spacer (420) provided in the second partition wall (320). The second spacer (420) may be provided in multiple numbers.

[0060] According to this configuration of the present invention, 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) due to the spacer (400). When a thermal event occurs, venting gas (g), flammable particles (f), or flames emitted from the battery cell (220) can flow through the gap between the partition wall (300) and the pack cover (500) and be discharged to the outside of the battery pack.

[0061] Referring to FIGS. 7 through 11, a venting guide (700) according to one embodiment of the present invention may be fixed to one side of a module case (210). A fixing part (710) of the venting guide (700) may be coupled, fixed, fastened, or attached to one side of the module case (210). Additionally, the fixing part (710) may cover one side of the module case (210). Additionally, the fixing part (710) may be provided on one side of the module case (210).

[0062] According to this configuration of the present invention, the venting guide (700) can be stably supported or fixed. As a result, the opening / closing part (720) can operate stably and the thermal safety of the battery pack can be improved.

[0063] Referring to FIGS. 7 through 11, the extended length of the opening / closing part (720) according to one embodiment of the present invention may be configured to be longer than the height between the module case (210) and the pack cover (500). The opening / closing part (720) may be extended obliquely from the fixed part (710). As a result, the opening / closing part (720) may be folded in only one direction. For example, the opening / closing part (720) may be folded in a direction closer to the upper surface of the module case (210). And the opening / closing part (720) may not be folded in a direction further away from the module case (210).

[0064] According to this configuration of the present invention, the venting guide (700) is configured to be foldable in only one direction, thereby providing directionality to the flow of the venting gas (g). In addition, the venting guide (700) prevents the venting gas (g) from flowing backward, thereby blocking or suppressing heat propagation to an adjacent battery module (200). As a result, the thermal safety of the battery pack can be improved.

[0065] Referring to FIGS. 7 to 11, an opening / closing part (720) according to one embodiment of the present invention can cover the upper surface of a module case (210). The opening / closing part (720) can cover the upper surface of the module case (210) in a folded or unfolded state. Additionally, the opening / closing part (720) may come into contact with the upper surface of the module case (210) as it is folded.

[0066] According to this configuration of the present invention, the opening / closing portion (720) can be extended from the fixed portion (710) long enough to cover the upper surface of the module case (210). As a result, the venting guide (700) can provide directionality to the flow of the venting gas (g).

[0067] Referring to FIGS. 7 through 11, a venting guide (700) according to one embodiment of the present invention may be in oblique contact with a pack cover (500). The upper or upper edge of the opening / closing part (720) may be in contact with the lower surface of the pack cover (500). The opening / closing part (720) may be in contact with the pack cover (500) while closing the gap between the module case (210) and the pack cover (500). Additionally, contact with the pack cover (500) may be separated while the opening / closing part (720) opens the gap between the module case (210) and the pack cover (500).

[0068] According to this configuration of the present invention, the opening / closing part (720) comes into contact with the pack cover (500), thereby more reliably blocking or suppressing the backflow of the venting gas (g). As a result, heat propagation of the battery pack can be suppressed.

[0069] Referring to FIGS. 7 through 11, a venting guide (700) of a battery pack according to one embodiment of the present invention may be located between a partition wall (300) and a module case (210). The partition wall (300) may partition the internal space of the case (100). Additionally, the partition wall (300) may be positioned along the side of the battery module (200). Furthermore, a fixing part (710) may be coupled, fastened, fixed, attached, or positioned between one side of the module case (210) and the partition wall (300). The fixing part (710) may be coupled, fastened, fixed, attached, or positioned on one side of the module case (210) or on one side of the partition wall (300).

[0070] According to this configuration of the present invention, the venting guide (700) can be stably supported or fixed. As a result, the opening / closing part (720) can operate stably and the thermal safety of the battery pack can be improved.

[0071] FIG. 12 is an enlarged view of section C of FIG. 10 when a thermal event occurs. Referring to FIG. 12, a thermal event may occur from a battery cell (220) or a battery module (200). Venting gas (g) and flammable particles (f) may be discharged in an upward direction or in the Z-axis direction through the venting hole (211) of the battery module (200). Venting gas (g) and flammable particles (f) introduced 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, venting gas (g) and flammable particles (f) introduced into the gap between the module case (210) and the pack cover (500) may flow in the forward and backward directions.

[0072] FIG. 13 is a diagram showing the flow of venting gas (g) in part C of FIG. 10. Referring to FIG. 13, the venting gas (g) and flammable particles (f) can fold the opening / closing portion (720) of the venting guide (700) located in front of the battery module (200) where a thermal event occurred. As the opening / closing portion (720) is folded, the gap between the module case (210) and the pack cover (500) can be opened, and the venting gas (g) and flammable particles (f) can move forward or in the +X-axis direction.

[0073] On the other hand, venting gas (g) and flammable particles (f) flowing in the rearward or -X-axis direction may collide with the opening / closing part (720) of the venting guide (700) provided in the battery module (200) where a thermal event occurred. At this time, the opening / closing part (720) of the venting guide (700) may remain in a closed state. As a result, the flow of venting gas (g) and flammable particles (f) in the -X-axis direction may be blocked or suppressed.

[0074] Additionally, by blocking or suppressing the flow of venting gas (g) and flammable particles (f) in the -X axis direction, radiative heat transfer and convective heat transfer through the venting hole (211) of the adjacent battery module (200) can be prevented.

[0075] Referring to FIGS. 12 and 13, a venting guide (700) of a battery pack according to one embodiment of the present invention may be configured to allow flow in one direction by folding and to restrict flow in the opposite direction by unfolding. For example, the venting guide (700) may allow flow in the +X-axis direction and restrict flow in the -X-axis direction.

[0076] According to this configuration of the present invention, the venting guide (700) is configured to be foldable in only one direction, thereby providing directionality to the flow of the venting gas (g). In addition, the venting guide (700) prevents the venting gas (g) from flowing backward, thereby blocking or suppressing heat propagation to an adjacent battery module (200). As a result, the thermal safety of the battery pack can be improved.

[0077] Referring to FIGS. 7 to 13, a battery pack according to one embodiment of the present invention may have a plurality of venting guides (700). A venting guide (700) may be provided for each battery module (200). And the plurality of venting guides (700) may be installed in a folded or bent state in the same direction.

[0078] According to this configuration of the present invention, even if a thermal event occurs in any of the plurality of battery modules (200), the venting gas (g) and flammable particles (f) can flow only in the +X-axis direction. As a result, the thermal propagation of the battery pack can be blocked or suppressed.

[0079] FIG. 14 is an enlarged view of section D of FIG. 10. FIG. 15 is an enlarged view of section E of FIG. 10. Referring to FIG. 14 and FIG. 15, a battery pack according to one embodiment of the present invention may further include a venting device (600) located in one direction and provided on one side of a case (100). The venting device (600) can discharge gas inside the case (100) to the outside when the pressure inside the battery pack increases. For example, the venting device (600) may be installed on the front side wall (120). Venting gas (g) flowing in the +X-axis direction or forward may be discharged to the outside of the case (100) through the venting device (600). At this time, flammable particles (f) flowing in the +X-axis direction or forward may be suppressed or blocked from being discharged to the outside of the case (100) by the venting device (600).

[0080] According to this configuration of the present invention, the venting gas (g) is discharged through the venting device (600) while preventing backflow, thereby minimizing heat propagation. As a result, the thermal safety of the battery pack can be improved.

[0081] Referring to FIG. 14, the venting gas (g) and flammable particles (f) generated in the battery module (200b) can be flowed in the +X axis direction by folding the venting guide (700a) provided in the battery module (200a) located in the front. The venting gas (g) can be discharged to the outside through the venting device (600). Additionally, the flow of the venting gas (g) and flammable particles (f) in the -X axis direction can be blocked or suppressed by the venting guide (700b). As a result, heat propagation to the battery module (200c) located in the rear can be suppressed or blocked.

[0082] Referring to FIG. 15, the venting gas (g) generated in the battery module (200a) can be discharged to the outside through the venting device (600). Additionally, the flow of the venting gas (g) and flammable particles (f) in the -X axis direction can be blocked or suppressed by the venting guide (700a). As a result, heat propagation to the battery module (200b) located at the rear can be suppressed or blocked.

[0083] FIG. 16 is a drawing showing a modified embodiment of the cross-sectional configuration according to the cutting line A-A' of FIG. 1. FIG. 17 is an enlarged view of section F of FIG. 16. Referring to FIG. 16 and FIG. 17, a battery pack according to one embodiment of the present invention may include a venting device (600) provided on a front side wall (120) and a rear side wall (120), respectively. At this time, a plurality of venting guides (700a, 700b, 700c, 700d) may be installed so that the venting gas (g) can be discharged through the nearest venting device (600).

[0084] For example, the venting guide (700a, 700b) provided in the battery module (200a, 200b) can be bent or folded in the +X axis direction. As a result, the venting gas (g) generated in the battery module (200a, 200b) can be discharged through the venting device (600) provided in the front side wall (120).

[0085] Additionally, the venting guide (700c, 700d) provided in the battery module (200c, 200d) can be bent or folded toward the -X axis direction. As a result, the venting gas (g) generated in the battery module (200c, 200d) can be discharged through the venting device (600) provided in the rear side wall (120).

[0086] In addition, the battery pack according to the present invention may further include various components, such as components of a battery pack known at the time of filing the present invention, such as a BMS, a busbar, a relay, a current sensor, etc.

[0087] An automobile according to the present invention may include a battery pack according to the present invention as described above. The battery pack according to the present invention may be applied to an automobile such as an electric vehicle or a hybrid vehicle. In addition, the automobile according to the present invention may further include various other components included in the automobile in addition to such a battery pack, for example, a vehicle body, a motor, a control device such as an ECU (electronic control unit), etc.

[0088] Meanwhile, although terms indicating directions such as up, down, left, right, front, and back have been used in this specification, these terms are used merely for convenience of explanation, and it is obvious to those skilled in the art that they may vary depending on the location of the object or the position of the observer.

[0089] As described above, although the present invention has been explained by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs. Explanation of the symbols

[0090] 100: Case 110: Base Plate 120: Sidewall 200: Battery module 210: Modular Case 211: Benting Hall 220: Battery cell 300: Partition Wall 310: 1st Partition Wall 320: Second Partition Wall 400: Spacer 410: 1st Spacer 420: 2nd Spacer 500: Pack Cover 600: Venting device 700: Venting Guide 710: Fixed part 720: Opening / closing part fl: folding line f: ignitable particles g: Venting gas

Claims

Claim 1 A battery pack comprising: a case having an open top surface and providing an internal space; a battery cell accommodated in the case; a pack cover coupled to the top surface of the case and covering the battery cell; and a venting guide for opening and closing a gap between the pack cover and the battery cell, wherein the venting guide is configured to be foldable. Claim 2 In claim 1, the venting guide comprises a battery pack including a flexible material. Claim 3 delete Claim 4 In claim 1, the venting guide is a battery pack that contacts the pack cover at an angle. Claim 5 A battery pack according to claim 1, wherein the venting guide is configured to allow flow in one direction by folding and to restrict flow in the opposite direction of said one direction by unfolding. Claim 6 A battery pack according to claim 5, further comprising a venting device provided on one side of the case and located in one direction. Claim 7 A battery pack according to claim 1, further comprising a module case located in the internal space of the case and accommodating the battery cell, wherein the venting guide comprises: a fixing part fixed to one side of the module case; and an opening / closing part extending upward from the fixing part and opening / closing the gap. Claim 8 In claim 7, the extended length of the opening / closing part is configured to be longer than the height between the module case and the pack cover. Claim 9 In claim 7, the opening / closing part is a battery pack covering the upper surface of the module case. Claim 10 In claim 7, the module case is a battery pack having a venting hole formed on the upper surface. Claim 11 In claim 7, the case further comprises a partition wall dividing the internal space of the case, and the fixing part is a battery pack located between the module case and the partition wall. Claim 12 In claim 11, the device further comprises a spacer provided on the top of the partition wall, and the pack cover is a battery pack coupled to the spacer. Claim 13 An automobile comprising a battery pack according to any one of claims 1, 2 and 4 through 12.

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