Battery module

Abstract

A battery module according to various embodiments may comprise: a battery cell stack in which two or more battery cells are stacked; a frame accommodating the battery cell stack and including a plurality of venting holes on one surface thereof; and a hole cover part configured to cover the plurality of venting holes, wherein the hole cover part comprises: a cover plate; a rotation shaft connected to one end of the cover plate and rotatably fixed to the frame; and an elastic member having one end connected to the rotation shaft and the other end connected to the frame. Other embodiments are also possible.

Description

battery module

[0001] Various embodiments of the present disclosure relate to a battery module.

[0002] Secondary batteries, capable of being recharged and discharged, are widely used in mobile devices such as digital cameras, cell phones, and laptops. Recently, they have been attracting attention as an energy source for electric vehicles and energy storage systems (ESS).

[0003] In particular, as large-capacity and high-output power are required in electric vehicles and power storage devices, battery modules that house a number of secondary batteries (i.e., battery cells) inside a housing or large-capacity battery devices that connect multiple battery packs are widely used.

[0004] However, battery modules or battery devices containing such a large number of battery cells may be more vulnerable to thermal chain reactions. For example, if a thermal event such as thermal runaway occurs within a battery module, and the propagation of this thermal runaway to other battery cells or modules is not contained, the event occurring in a specific battery cell or module could trigger a chain reaction in other nearby battery modules, potentially increasing the scale of a fire or explosion.

[0005] Various embodiments of the present disclosure have been devised to solve at least some of the problems of the prior art as described above, and can provide an improved battery module and a battery device including the same that can stably discharge gas or flames generated in a specific battery cell to the outside while minimizing the transmission of such gas or flames to other normal battery cells.

[0006] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from various embodiments of the present disclosure.

[0007] To achieve the above purpose, in various embodiments of the present disclosure, a battery module may include a battery cell stack in which two or more battery cells are stacked; a frame that accommodates the battery cell stack and includes a plurality of venting holes on one surface; a hole cover portion configured to cover the plurality of venting holes, wherein the hole cover portion may include a cover plate; a rotational shaft connected to one end of the cover plate and rotatably fixed to the frame; and an elastic member having one end connected to the rotational shaft and the other end connected to the frame.

[0008] In embodiments, the rotation axis may extend in a direction perpendicular to the stacking direction of the battery cells.

[0009] In embodiments, the hole cover portion may be configured such that a plurality of cover plates are connected to one rotation axis, and the plurality of cover plates connected to one rotation axis rotate as one unit.

[0010] In embodiments, the plurality of cover plates connected to one rotational axis may be spaced apart from each other.

[0011] In embodiments, the elastic member may be positioned between the mutually spaced spaces of the plurality of cover plates.

[0012] In embodiments, the mutually spaced spaces of the plurality of cover plates may correspond to sealing reinforcement areas of the battery cells.

[0013] In embodiments, a plurality of rotation axes are provided, and each rotation axle can be spaced apart from each other along the stacking direction of the battery cells.

[0014] In embodiments, the first cover plates connected to some of the plurality of rotation axes may be configured to rotate in a first direction to open venting holes corresponding to the first cover plates, and the second cover plates connected to some of the remaining portions of the plurality of rotation axes may be configured to rotate in a second direction opposite to the first direction to open venting holes corresponding to the second cover plates.

[0015] In embodiments, the elastic member connected to some of the plurality of rotation axes may be configured to apply an elastic force to cause the first cover plates to rotate in the second direction, and the elastic member connected to some of the remaining portions of the plurality of rotation axes may be configured to apply an elastic force to cause the second cover plates to rotate in the first direction.

[0016] In embodiments, the cover plate may be configured to open or close at least some of the plurality of venting holes based on pressure inside the frame.

[0017] In embodiments, the cover plate may include a first side facing the battery cells and a second side facing in an opposite direction to the first side, wherein the first side may be formed of a metal material, and the second side may be formed of a material having a higher fire resistance performance than the material forming the first side.

[0018] According to various embodiments, even if a thermal event occurs in a specific battery cell, the spread of flame or gas to surrounding normal battery cells is prevented and the venting gas is quickly discharged outside the battery module, thereby delaying the spread or amplification rate of the thermal event and enhancing the structural stability of the battery module.

[0019] Additionally, it is possible to prevent foreign substances such as moisture or dust from entering the inside of the battery module when no thermal event occurs.

[0020] FIG. 1 is a perspective view of a battery module according to one embodiment of the present disclosure.

[0021] Figure 2 is a partial perspective view enlarged from part A of Figure 1.

[0022] FIG. 3 is a schematic drawing of a venting hole and a hole cover portion of a battery module frame according to one embodiment of the present disclosure.

[0023] FIG. 4 is a schematic cross-sectional view of a battery module according to one embodiment of the present disclosure.

[0024] FIG. 5 is a perspective view of a battery module according to one embodiment of the present disclosure.

[0025] Figure 6 is a schematic cross-sectional view of the battery module of Figure 5.

[0026] FIG. 7 is a schematic top view of a battery module according to one embodiment of the present disclosure.

[0027] FIG. 8 is a perspective view of a battery module according to one embodiment of the present disclosure.

[0028] Fig. 9 is a side view of the battery module of Fig. 8.

[0029] FIG. 10 is a schematic cross-sectional view of a battery module according to one embodiment of the present disclosure.

[0030] FIGS. 11A and 11B are schematic top and side views illustrating the position of a cover plate in a battery module according to one embodiment of the present disclosure.

[0031] Before going into the detailed description of the present invention, it should be noted that the terms and words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted with meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain his own invention in the best way. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of ​​the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of this application.

[0032] The same reference numbers or symbols used in each drawing attached to this specification represent parts or components that perform substantially the same functions. For convenience of explanation and understanding, the same reference numbers or symbols may be used in different embodiments. In other words, even if components with the same reference numbers are depicted in multiple drawings, they do not necessarily represent a single embodiment.

[0033] In the following description, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "comprises" or "comprises" should be understood to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0034] In addition, in the description below, expressions such as top, upper, lower, lower, side, front, and rear are expressed based on the direction shown in the drawing, and it is noted in advance that they may be expressed differently if the direction of the object in question changes.

[0035] Additionally, terms including ordinal numbers, such as "first," "second," etc., may be used in this specification and claims to distinguish between components. These ordinal numbers are used to distinguish identical or similar components from each other, and the use of these ordinal numbers should not be interpreted in a limited manner. For example, components associated with these ordinals should not be interpreted in a restricted manner, such as in the order of use or arrangement, based on their numbers. If necessary, each ordinal number may be used interchangeably.

[0036] Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. However, the spirit of the present invention is not limited to the presented embodiments. For example, those skilled in the art who understand the spirit of the present invention may propose other embodiments within the spirit of the present invention by adding, modifying, or deleting components, etc., but such embodiments will also be considered to be within the spirit of the present invention. The shapes and sizes of elements in the drawings may be exaggerated for clarity.

[0037] Fig. 1 is a perspective view of a battery module (1) according to one embodiment of the present disclosure. Fig. 2 is a partial perspective view of the battery module (1) enlarged from part A of Fig. 1. Fig. 3 is a schematic drawing of a venting hole (120) provided in a frame (100) according to one embodiment of the present disclosure and a cover plate (220) covering the venting hole (120). Fig. 4 is a schematic cross-sectional view of a battery module according to one embodiment of the present disclosure.

[0038] Referring to FIGS. 1 to 4, a battery module (1) according to various embodiments may include a battery cell stack (10) and a frame (100) that accommodates the battery cell stack (10).

[0039] According to various embodiments, the battery cell stack (10) may include a plurality of battery cells (11).

[0040] For example, a battery cell (11) may mean a secondary battery.

[0041] For example, each battery cell (11) may include an electrode assembly, an electrolyte, and a battery cell case.

[0042] For example, each battery cell (11) may be stacked along one direction (e.g., the X-axis direction of FIG. 4).

[0043] In the embodiment, the battery cell (11) provided in the battery cell stack (10) may be a pouch-type battery cell.

[0044] For example, a plurality of pouch-shaped battery cells (11) included in a battery cell stack (10) may be arranged in a stacked form so that the wide surfaces of the storage portions (see FIG. 10b) in which the electrode assembly is stored face the side, and the wide surfaces of the storage portions face each other. However, the present invention is not limited to the above examples, and it goes without saying that various embodiments of the present disclosure may be applied to cylindrical batteries, square batteries, and the like.

[0045] Meanwhile, in the embodiment, an auxiliary member (or pad) (12) may be further arranged at the outermost end of the battery cell stack (10) or between the battery cells (11) to block the transfer of heat or shock between the battery cells (11) or to absorb and cool heat from the battery cells (11).

[0046] According to various embodiments, the frame (100) may include a space on the inside in which a battery cell stack (10) can be accommodated.

[0047] The frame (100) may include, for example, six plates and may be configured in the shape of a substantially rectangular parallelepiped.

[0048] For example, at least a portion of each plate may be formed in an integral form, or may be manufactured individually and then joined together by welding, bolting, or the like.

[0049] For example, the frame (100) may be formed of a material with excellent heat resistance and high rigidity (e.g., a metal such as aluminum) to protect the battery cell stack (10).

[0050] According to various embodiments, the frame (100) may include a plurality of venting holes (120) on one surface.

[0051] For example, the frame (100) may include venting holes (120) on the upper surface (100a) based on the arrangement of the battery module (1) of FIG. 1.

[0052] The venting hole (120) may be configured to penetrate the inside and outside of the frame (100), and may be provided so that when a specific battery cell (e.g., 11' in FIG. 6) of the battery cell stack (10) is ignited and venting gas is generated inside the frame (100), the venting gas can be smoothly discharged to the outside.

[0053] The venting hole (120) may have an oval shape, as illustrated in FIG. 3, but various embodiments of the present disclosure are not necessarily limited to this shape. For example, the venting hole (120) illustrated in dotted lines in FIG. 3 may be replaced with one or more circular or rectangular shapes.

[0054] Meanwhile, according to various embodiments of the present disclosure, the battery module (1) may further include a hole cover portion (200) configured to cover the venting hole (120).

[0055] For example, the hole cover part (200) can be configured to be opened and closed by rotating in one direction (e.g., toward the outside of the frame (100) of the battery module (1)) based on the pressure inside the frame (100) of the battery module (1).

[0056] For example, the hole cover portion (200) may include at least one of a cover plate (220), a rotation axis (240), and an elastic member (260).

[0057] For example, the cover plate (220) is positioned so as to cover the venting hole (120) on the outside of the frame (100), and may be configured to have a size at least partially larger than or the same size as the venting hole (120).

[0058] For example, the cover plate (220) can be formed of a metal material having excellent heat resistance and a certain level of rigidity.

[0059] For example, the cover plate (200) may be formed of the same material as the frame (100), or may be formed of another material that is lighter than the frame (100).

[0060] The cover plate (220) may have an elliptical shape extending in one direction (e.g., the Y-axis direction of FIG. 1) corresponding to the longitudinal direction of the battery cell (11). However, the present embodiments are not limited to the illustrated shape, and in various embodiments, unlike the illustrated one, the cover plate (220) may have a rectangular shape with only a partial curvature at the corners or no curvature at the corners.

[0061] Meanwhile, in various embodiments, the cover plate (220) may be fixed on one side to a rotation axis (240). For example, the cover plate (220) and the rotation axis (240) may be interconnected and rotate as one unit.

[0062] For example, the rotation axis (240) may extend along the longitudinal direction of the battery cell (11).

[0063] For example, the rotation axis (240) may extend in a direction (e.g., the Y-axis direction) perpendicular to the direction in which the battery cells (11) are stacked (i.e., the X-axis direction in FIG. 4) on one surface (e.g., the upper surface (100a)) of the frame (100).

[0064] For example, the rotation axis (240) may be mounted in a rotatable manner, with each end (210) connected to the frame (100). For example, the rotation axis (240) may be configured to be rotatable together with the cover plate (220) by the internal pressure of the frame (100) or the elastic force of the elastic member (260).

[0065] Meanwhile, as illustrated in FIGS. 1 and 4, in the embodiment, a plurality of rotation axes (240) may be provided.

[0066] For example, a plurality of rotation axes (240) may be arranged spaced apart from each other along the stacking direction of the battery cells (11). The plurality of rotation axes (240) may each move independently of each other.

[0067] Meanwhile, the direction of rotation of the cover plate (220) may be set differently depending on the direction of the end of the cover plate (220) connected to the rotation axis (240). For example, in various embodiments of the present disclosure, at least some of the plurality of cover plates (220) may have the rotation axis (240) arranged on the first side, and at least some of the other may have the rotation axis (240) arranged on the second side opposite to the first side.

[0068] According to various embodiments, the elastic member (260) may have one end connected to the rotation axis (240) and the other end connected to the frame (100).

[0069] For example, the elastic member (260) can apply a predetermined elastic force in the direction in which the cover plate (220) connected to the rotation axis (240) closes the venting hole (120).

[0070] For example, the elastic member (260) may be placed at a point between the two ends of the rotation axis (240), for example, in a blank area between cover plates (220) connected to a specific rotation axis (240).

[0071] Fig. 5 is a perspective view of a battery module according to one embodiment of the present disclosure. Fig. 6 is a schematic cross-sectional view of the battery module of Fig. 5.

[0072] For example, FIGS. 5 and 6 are drawings for explaining a state in which some cover plates (220) (e.g., 221, 222, 223) are opened in the battery module (1) described with reference to FIGS. 1 to 4.

[0073] Referring to FIGS. 5 and 6, in a battery module (1) according to various embodiments, one rotation axis (240) may be connected to a plurality of cover plates (220) (e.g., 221, 222, 223 of FIG. 5). In this case, each of the plurality of cover plates (220) connected to one rotation axis (240) may rotate integrally with the rotation axis (240).

[0074] Meanwhile, a plurality of cover plates (220) (e.g., 221, 222, 223) connected to one rotation axis (240) can be arranged to be spaced apart from each other by a predetermined interval.

[0075] For example, an elastic member (260) may be arranged in at least some of the spaced apart spaces between a plurality of cover plates (220) (e.g., 221, 222, 223) connected to one rotation axis (240). For example, the spaced apart space may correspond to a sealing reinforcement area of ​​each battery cell (11, 11') in an area where the possibility of venting gas leakage is relatively low. In this way, in various embodiments of the present disclosure, by setting the spaced apart space between the cover plates (220) as a point where the possibility of venting gas leakage is relatively low, not only is the weight of the battery module (1) prevented from increasing unnecessarily, thereby improving energy efficiency, but also, by efficiently arranging the elastic member (260) in the space, it is possible to provide an effect of evenly imparting elasticity to each area of ​​the cover plates (220).

[0076] Again, referring to FIGS. 5 and 6, the battery module (1) according to various embodiments may have an internal pressure around the battery cell (11') ignited by the venting gas as a specific battery cell (11') inside the frame (100) is ignited and venting gas is released, and a pressure is applied to the adjacent cover plate (220) so that the cover plate (220) can rotate outwardly from the frame (100) to open the venting hole (120).

[0077] For example, the cover plate (220) can rotate in the direction of opening the venting hole (120) on the outside of the frame (100) when the force of the venting gas pushing the cover plate (220) from the inside of the frame (110) is greater than the elastic force of the elastic member (260).

[0078] Meanwhile, when a certain amount of venting gas is discharged to the outside through the open venting hole (120) in the embodiment, the internal pressure inside the frame (100) may decrease again, and accordingly, when the force of the venting gas pushing the cover plate (220) becomes smaller than the elastic force of the elastic member (260), the cover plate (220) may rotate again in the direction of closing the venting hole (120).

[0079] In addition, in the case of a venting hole (120) near another battery cell (11) that is spaced apart from the ignited battery cell (11') by a certain distance, the internal pressure around the venting hole (120) does not increase to the extent of pushing out the cover plate (220), so that the cover plates (220) covering the venting hole (120) can be maintained in a closed state. Accordingly, even if the venting gas emitted from the ignited battery cell (11') is discharged to the outside of the frame (100) by the open cover plate (220'), the discharged venting gas may not flow into the other normal battery cell (11).

[0080] FIG. 7 is a schematic top view of a battery module according to one embodiment of the present disclosure. FIG. 8 is a perspective view of a battery module according to one embodiment of the present disclosure. FIG. 9 is a side view of the battery module of FIG. 8.

[0081] Referring to FIGS. 7 to 9, in a battery module (1) according to various embodiments, at least some of the cover plates (220) can open the venting hole (120) by rotating in a first direction, and at least some of the other cover plates (220) can open the venting hole (120) by rotating in a second direction opposite to the first direction.

[0082] To this end, at least some of the cover plates (220) (e.g., a group of cover plates (220) located at the L portion) may be connected to each of the rotation axes (240) at a first side (e.g., a -X-axis direction end), and at least some of the other cover plates (220) (e.g., a group of cover plates (220) located at the R portion) may be connected to each of the rotation axes (240) at a second side opposite to the first side (e.g., a +X-axis direction end).

[0083] For example, a group of cover plates (220) located in the L portion (hereinafter, the first cover plate group) can be opened by rotating in a first direction (e.g., clockwise with reference to FIG. 9), and a group of cover plates (220) located in the R portion (hereinafter, the second cover plate group) can be opened by rotating in a second direction opposite to the first direction (e.g., counterclockwise with reference to FIG. 9).

[0084] For example, each of the cover plates (220) that rotate in different directions when opened can be configured to rotate in a direction in which the outer surface (e.g., the surface facing the outside of the frame (100)) of each cover plate (220) approaches each other when opened. Accordingly, the gas discharge direction formed by the opening of the first cover plate group can be different from the gas discharge direction formed by the opening of the second cover plate group. With this opening structure, the high-temperature gas or flame discharged by the opening of the cover plates can be guided to flow in a certain direction. In addition, even when the cover plates (220) of the two groups are each opened, the high-temperature gas or flame discharged from the venting hole opened by one group of cover plates (220) can be prevented from flowing back into the venting hole opened by the cover plate (220) of the other group.

[0085] In one embodiment, the maximum opening angle of each cover plate (220) may be limited to form an acute angle. For example, the maximum opening angle of the cover plate (220) may be limited by an elastic force applied from an elastic member (260) connected to the rotational axis (240). To this end, the elastic coefficient of the elastic member (260) may be appropriately set so that the maximum opening angle of the cover plates (220) may form an acute angle. Alternatively, a stopper member (not shown) may be disposed on the frame (100) of the battery module (1) adjacent to the cover plate (220) or the rotational axis (240) to prevent the cover plate (220) from rotating beyond a certain degree. However, the maximum opening angle of the cover plate (220) is not limited to that described above, and may be configured to be 90 degrees or more, if necessary.

[0086] FIG. 10 is a schematic cross-sectional view of a battery module (1) according to one embodiment of the present disclosure.

[0087] Referring to FIG. 10, a cover plate (220) configured to cover a venting hole (120) provided on one side of a frame (100) in a battery module (1) according to various embodiments may include a coating surface (225) formed of a material having excellent fire resistance.

[0088] In a battery module (1) according to various embodiments, a cover plate (220) may include a first surface (221) facing the battery cells (11, 11') on the inside of the frame (100), and a second surface (222) facing in the opposite direction to the first surface (221). For example, the second surface (222) may correspond to a surface facing the outside of the frame (100).

[0089] For example, the first side (221) and the second side (222) may be formed of different materials. For example, the cover plate (220) may be formed by bonding two layers of different materials, or may be formed by coating one side of a specific layer with a different material.

[0090] For example, the first side (221) can be formed of a material having excellent rigidity characteristics, and the second side (222) can be formed of a material having better fire resistance characteristics.

[0091] For example, the first side (221) may be formed of a metal material, and the second side (222) may be formed of a fiber-reinforced plastic (e.g., basalt fiber, etc.) with excellent fire resistance.

[0092] By forming the surface (e.g., the second surface (222)) of the cover plate (220) facing the outside of the frame (100) with a material having excellent fire resistance, even if venting gas (or flame) is emitted from a specific battery cell (11') that has ignited and flows outside the frame (100), damage such as melting of another adjacent cover plate (220) in a closed state can be prevented.

[0093] FIG. 11a and FIG. 11b are schematic top and side views for explaining the arrangement position of the cover plate (220) in the battery module (1) according to one embodiment of the present disclosure.

[0094] Referring to FIGS. 11a and 11b, in a battery module (1) according to various embodiments, a plurality of cover plates (220) connected to one rotation axis (240) may be arranged to be spaced apart from each other in the longitudinal direction (e.g., Y-axis direction).

[0095] Meanwhile, in the embodiment, the cover plates (220) connected to the above-described single rotation axis (240) may be positioned corresponding to areas (11A, 11B, 11C) in which venting gas is relatively easily released in each battery cell (11).

[0096] For example, the areas (11A, 11B, 11C) vulnerable to the release of venting gas may correspond to the remaining areas excluding the sealing reinforcement area (11T) at the edge of the pouch-type battery cell (11). For example, the sealing reinforcement area (11T) in the battery cell (11) may correspond to a portion of the sealed edge portion of the cell case forming the outer shape of the battery cell (11) that is additionally sealed using a sealing tape or the like.

[0097] For example, a space (e.g., a space between 11A and 11B, a space between 11B and 11C) spaced apart from each other in a plurality of cover plates (220) connected to one rotation axis (240) may be an area corresponding to a sealing reinforcement area (11T) in a battery cell (11).

[0098] In various embodiments of the present disclosure, a space is provided between a plurality of cover plates (220) in the axial direction, thereby minimizing the obstruction to the discharge of venting gas while maximizing the structural rigidity of the battery module (1) and the efficiency of the arrangement structure.

[0099] In addition, by arranging other components such as elastic members (260) in the gap between the cover plates (220) in the axial direction, the efficiency of arranging the parts can be increased, and the elastic members (260) can be stably provided with elastic force to each cover plate (220) and the rotation axis (240).

[0100] While various embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and it will be apparent to those skilled in the art that various modifications and variations are possible without departing from the technical spirit of the present invention as set forth in the claims. Furthermore, the embodiments described above may be implemented by deleting some components, and the embodiments may be implemented in combination with each other.

Claims

1. In the battery module, A battery cell stack in which two or more battery cells are stacked; A frame that accommodates the battery cell stack and includes a plurality of venting holes on one surface; Including a hole cover portion configured to cover the plurality of venting holes, The above hole cover part, A cover plate configured to open and close at least one of the plurality of venting holes; A rotary shaft connected to one end of the cover plate and rotatably fixed to the frame; and A battery module comprising an elastic member, one end of which is connected to the rotation axis and the other end of which is connected to the frame.

2. In paragraph 1, A battery module wherein the rotation axis is formed to extend in a direction perpendicular to the stacking direction of the battery cells.

3. In paragraph 1, The above hole cover part, Multiple cover plates are connected to one rotation axis, A battery module in which a plurality of cover plates connected to the above-mentioned single rotation axis are configured to rotate integrally.

4. In paragraph 3, A battery module wherein the plurality of cover plates connected to the above one rotation axis are spaced apart from each other.

5. In paragraph 4, A battery module wherein the elastic member is disposed between the mutually spaced spaces of the plurality of cover plates.

6. In paragraph 4, A battery module, wherein the mutually spaced spaces of the plurality of cover plates correspond to the sealing reinforcement areas of the battery cells.

7. In paragraph 1, The above rotation axis is provided in a plurality of numbers, A battery module, wherein each axis of rotation is spaced apart from each other along the stacking direction of the battery cells.

8. In paragraph 7, The first cover plates connected to some of the plurality of rotation axes are configured to rotate in a first direction to open venting holes corresponding to the first cover plates, A battery module, wherein the second cover plates connected to the remaining portions of the plurality of rotation axes are configured to rotate in a second direction opposite to the first direction to open the venting holes corresponding to the second cover plates.

9. In paragraph 8, The elastic member connected to some of the plurality of rotation axes is configured to apply an elastic force to cause the first cover plates to rotate in the second direction, A battery module, wherein the elastic member connected to the remaining portion of the plurality of rotation axes is configured to apply an elastic force to the second cover plates so that they rotate in the first direction.

10. In paragraph 1, A battery module, wherein the cover plate is configured to open or close at least some of the plurality of venting holes based on the pressure inside the frame.

11. In paragraph 1, The cover plate includes a first surface facing the battery cells and a second surface facing in the opposite direction to the first surface, The above first surface is formed of a metal material, A battery module wherein the second side is formed of a material having better fire resistance than the material forming the first side.

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