Battery module, battery pack comprising the battery module, and electric vehicle

Abstract

A battery module according to the present application includes a plurality of battery cells, an upper frame located above the plurality of battery cells and having a plurality of ventilation holes, a lower frame located below the upper frame and having an accommodation space for accommodating at least a portion of each of the plurality of battery cells, and a module case located between the upper frame and the lower frame and above the plurality of battery cells, and the module case is provided with an upper cover having a plurality of openings configured to expose electrode terminals of the plurality of battery cells, a piezoelectric sensor film located between the upper frame and the upper cover or outside the upper frame, and the piezoelectric sensor is configured to generate an electric signal when pressure is applied thereto by an external force, and a control unit configured to receive the electric signal generated from the piezoelectric sensor film and analyze whether the battery cells will explode.

Description

Technical Field

[0001] The present disclosure relates to a battery module, a battery pack, and an electric vehicle, and more particularly, to a battery module capable of quickly detecting explosion of a battery cell.

[0002] This application claims priority from Korean Patent Application No. 10-2020-0131386 filed in Korea on October 12, 2020, the disclosure of which is incorporated herein by reference. Background Art

[0003] In recent years, as the demand for portable electronic products (such as laptops, cameras and portable phones) has rapidly increased, and the development of electric vehicles, energy storage batteries, robots, satellites, etc. is progressing rapidly, research on high-performance secondary batteries that can be repeatedly charged / discharged is being actively carried out.

[0004] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared with nickel-based secondary batteries. Therefore, they have attracted attention due to their advantages of free charging and discharging, extremely low self-discharge rate and high energy density.

[0005] These lithium secondary batteries mainly use lithium-based oxides and carbon materials as positive electrode active materials and negative electrode active materials, respectively. In addition, these lithium secondary batteries include an electrode assembly, in which a positive electrode plate and a negative electrode plate coated with a positive electrode active material and a negative electrode active material, respectively, are arranged with a separator located between the positive electrode plate and the negative electrode plate, and an outer shell (i.e., a battery case) is used to seal and store the electrode assembly and the electrolyte together.

[0006] In addition, lithium secondary batteries may be divided into can-type secondary batteries in which an electrode assembly is embedded in a metal can, and pouch-type secondary batteries in which an electrode assembly is embedded in a pouch of an aluminum laminate, according to the shape of an external case.

[0007] Among them, in the can type secondary battery, the metal can in which the electrode assembly is embedded can be manufactured in a cylindrical shape. The prior art battery module can include a bus bar configured to electrically connect a plurality of can type secondary batteries to a module case for accommodating the plurality of secondary batteries.

[0008] Furthermore, in order to manufacture a battery pack in the related art, a plurality of secondary batteries are mainly accommodated in a module case to manufacture a battery module, and the plurality of battery modules thus manufactured are mounted on a tray.

[0009] Recently, demand for products requiring large-capacity power storage, such as electric vehicles and power storage devices, has been increasing. In particular, when a battery pack is configured to use cylindrical battery cells, a large number of battery cells are stored within the limited internal space of a battery module. Compared to a battery module including a small number of cylindrical battery cells, a battery module including a large number of battery cells may produce a larger explosion in the event of an accident and may have a higher probability of explosion.

[0010] Furthermore, in the prior art, because battery module abnormalities are determined by measuring the temperature within the module housing, even if some of the numerous cylindrical battery cells within the battery module explode, if the exploded cylindrical battery cells are far from the temperature sensor, it is impossible to detect whether the explosion has occurred, or it takes a considerable amount of time to detect a temperature increase and determine whether the explosion has occurred. Consequently, in the event of a battery module explosion, the flames may not be quickly suppressed, spreading to a larger fire. Summary of the Invention

[0011] Technical issues

[0012] The present disclosure aims to solve the problems of the prior art, and thus the present invention aims to provide a battery module capable of quickly detecting battery cell explosions.

[0013] These and other objects and advantages of the present disclosure will be understood from the following detailed description and will become more apparent from the exemplary embodiments of the present disclosure. Moreover, it is easy to understand that the objects and advantages of the present disclosure can be achieved by the means shown in the appended claims and their combinations.

[0014] Technical Solution

[0015] A battery module according to the present disclosure for achieving this object includes:

[0016] Multiple battery cells;

[0017] a module case comprising an upper frame, a lower frame, and an upper cover, the upper frame being located above the plurality of battery cells and having a plurality of flow holes formed therein, the lower frame being located below the upper frame and including an accommodation space for accommodating at least a portion of each of the plurality of battery cells, the upper cover being located between the upper frame and the lower frame and above the plurality of battery cells and including a plurality of openings configured to expose electrode terminals of the plurality of battery cells;

[0018] a piezoelectric sensor film located between the upper frame and the upper cover or outside the upper frame, and configured to generate an electric signal when pressure is applied by an external force; and

[0019] A control unit is configured to receive the electrical signal generated from the piezoelectric sensor film and analyze whether the battery cell explodes.

[0020] In addition, the upper cover may include a partition wall extending to surround the plurality of openings and protruding upward.

[0021] Furthermore, the piezoelectric sensor film may be mounted on the partition wall.

[0022] Furthermore, the piezoelectric sensor film may be housed in a space surrounded by the partition wall, and

[0023] The partition wall may include a slit configured to allow an outer peripheral portion of the piezoelectric sensor film to be inserted.

[0024] Additionally, the piezoelectric sensor film may include:

[0025] a plurality of sensing units positioned to respectively face the plurality of openings formed in the upper cover; and

[0026] A connecting portion configured to connect between the plurality of sensing units.

[0027] Furthermore, the piezoelectric sensor film may include:

[0028] A cut portion is linearly cut in a portion corresponding to the plurality of flow holes.

[0029] Furthermore, the piezoelectric sensor film may include:

[0030] A bending portion is configured such that a portion can be bent along a reference line by external pressure.

[0031] Furthermore, a battery pack according to the present disclosure for achieving the above-mentioned object includes at least one battery module.

[0032] Furthermore, a battery pack may include a plurality of battery modules.

[0033] The battery pack may further include a tray configured to mount the plurality of battery modules.

[0034] The plurality of battery modules may be mounted on the tray, and

[0035] Piezoelectric sensor membranes can be configured to:

[0036] Covering upper portions of the plurality of battery modules.

[0037] Furthermore, an electric vehicle according to the present disclosure for achieving the above-mentioned object includes at least one battery module.

[0038] Beneficial effects

[0039] According to one aspect of the present disclosure, a piezoelectric sensor film is incorporated between the upper frame and the upper cover. Therefore, when at least some of the multiple battery cells explode, the explosion pressure generates an electrical signal from the piezoelectric sensor film, allowing a control unit to determine whether the battery cells have exploded. Therefore, compared to conventional techniques that only measure the temperature of some battery cells, it is possible to quickly detect whether multiple battery cells have exploded. Furthermore, the present disclosure can address the drawback of conventional techniques that only monitor the temperature of some battery cells and fail to detect explosions in battery cells located far from the temperature sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the foregoing disclosure, are used to provide a further understanding of the technical features of the present disclosure. Therefore, the present disclosure is not to be construed as being limited to the accompanying drawings.

[0041] Figure 1 is a perspective view schematically illustrating a battery module according to an embodiment of the present disclosure.

[0042] Figure 2 is an exploded perspective view schematically illustrating the configuration of a battery module according to an embodiment of the present disclosure.

[0043] Figure 3 is a perspective view schematically illustrating a state of a battery module according to another embodiment of the present disclosure.

[0044] Figure 4 is a vertical cross-sectional view schematically illustrating a state of an upper cover and a piezoelectric sensor film of a battery module according to another embodiment of the present disclosure.

[0045] Figure 5 is a perspective view schematically showing a state of a piezoelectric sensor film of a battery module according to another embodiment of the present disclosure.

[0046] Figure 6 is a perspective view schematically showing a state of a piezoelectric sensor film of a battery module according to another embodiment of the present disclosure.

[0047] Figure 7 is a perspective view schematically showing a battery pack according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0048] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the terms used in the specification and the appended claims should not be interpreted as limited to the general and dictionary meanings, but should be interpreted based on the meanings and concepts corresponding to the technical aspects of the present disclosure based on the principle that the inventor is allowed to appropriately define the terms for the best interpretation.

[0049] Therefore, the descriptions presented herein are merely preferred examples for illustrative purposes and are not intended to limit the scope of the present disclosure, and it should be understood that other equivalents and modifications may be made thereto without departing from the scope of the present disclosure.

[0050] Figure 1 : is a perspective view schematically showing a battery module according to an embodiment of the present disclosure. Figure 2 is an exploded perspective view schematically illustrating the configuration of a battery module according to an embodiment of the present disclosure.

[0051] Reference Figure 1 and Figure 2 , a battery module 100 according to an embodiment of the present disclosure includes a plurality of battery cells 110 , a module case 120 , a piezoelectric sensor film 130 , and a control unit 140 .

[0052] Specifically, each battery cell 110 may be a cylindrical battery cell 110. The cylindrical battery cell 110 may have a shape elongated in the upward and downward directions. Electrode terminals 111 and 112 may be provided on the upper portion of the cylindrical battery cell 110. The cylindrical battery cell 110 may include a battery can 116, a negative terminal 112 formed on the body of the battery can 116, and a positive terminal 111 formed on a battery cap coupled to the upper portion of the battery can 116. An electrode assembly (not shown) housed in the battery can 116 may be included. Because the configuration of the cylindrical battery cell 110 is well known to those skilled in the art at the time of filing this disclosure, a more detailed description will be omitted in this specification.

[0053] In addition, the plurality of battery cells 110 may be arranged in at least one direction. The plurality of cylindrical battery cells 110 may be arranged at predetermined intervals. For example, Figure 2 As shown, the plurality of battery cells 110 can be arranged in the front-to-back direction (Y-axis direction) and the left-to-right direction (X-axis direction). Furthermore, the plurality of cylindrical battery cells 110 in one column and the plurality of cylindrical battery cells 110 in another column can be arranged so that their left-to-right positions are different. In other words, it can be seen that the plurality of cylindrical battery cells 110 are arranged in a zigzag pattern, front, back, left, and right.

[0054] In addition, the plurality of battery cells 110 may be electrically connected via bus bars 150. The bus bars 150 may include a conductive metal. For example, the bus bars 150 may include a metal such as aluminum, nickel, or copper. The bus bars 150 may be mounted on the upper cover 123. That is, the bus bars 150 may be located on one side of the opening H2 of the upper cover 123. The bus bars 150 may be connected to the positive terminal, the negative terminal, or both the positive terminal and the negative terminal of the battery cells 110 via metal wires (not shown).

[0055] Furthermore, the module housing 120 may include an upper frame 121, a lower frame 122, and an upper cover 123. The upper frame 121 may be positioned above the plurality of battery cells 110. The upper frame 121 may include a plurality of circulation holes H1 configured to allow air inside the module housing 120 and air outside to circulate between each other. The upper frame 121 may have a plate shape extending in a horizontal direction.

[0056] In addition, the lower frame 122 may be located below the upper frame 121. The lower frame 122 may include an accommodation space 122a for accommodating at least a portion of each of the plurality of battery cells 110. For example, Figure 2 As shown, the lower frame 122 may include a side wall 122d extending to surround the plurality of battery cells 110 and a lower plate 122c connected to a lower portion of the side wall 122d. The side wall may form a space 122a in which the plurality of battery cells 110 may be accommodated.

[0057] In addition, an upper cover 123 may be located between the upper frame 121 and the lower frame 122. The upper cover 123 may have a plate shape extending in a horizontal direction. The upper cover 123 may be located above the plurality of battery cells 110. The upper cover 123 may include a plurality of openings H2 through which the electrode terminals 111 and 112 of each of the plurality of battery cells 110 may be exposed to the outside.

[0058] In addition, the piezoelectric sensor film 130 may be located between the upper frame 121 and the upper cover 123. The piezoelectric sensor film 130 may have a circumference interposed between a lower surface of the upper frame 121 and an upper surface of the upper cover 123.

[0059] Furthermore, the piezoelectric sensor film 130 can be configured to generate a voltage based on the displacement or deformation of a piezoelectric crystal due to pressure or torsion of the film. Specifically, the piezoelectric sensor film 130 can include a piezoelectric crystal. Examples of the piezoelectric crystal include quartz, Rochelle salt, barium titanate, and the like. The piezoelectric sensor film 130 can be made of, for example, a polyester material. The piezoelectric sensor film 130 can include at least two terminal ports T. When a voltage is generated due to pressure or torsion, the piezoelectric sensor film 130 can transmit an electrical signal to the control unit 140 via a coil C connected to the terminal ports T.

[0060] In addition, the control unit 140 may be configured to receive an electrical signal generated from the piezoelectric sensor film 130 and analyze whether the battery cell 110 has exploded. For example, the control unit 140 may be configured to determine that at least some of the plurality of battery cells 110 have exploded when receiving an electrical signal of a predetermined voltage or higher from the piezoelectric sensor film 130.

[0061] Therefore, according to this configuration of the present disclosure, the present disclosure includes a piezoelectric sensor film 130 between the upper frame 121 and the upper cover 123. Therefore, when at least some of the plurality of battery cells 110 explode, an electrical signal generated by the explosion pressure from the piezoelectric sensor film 130 allows the control unit 140 to determine whether the battery cells 110 have exploded. Therefore, compared to the technology represented by the prior art that only measures the temperature of some of the battery cells 110, it is possible to quickly detect whether the plurality of battery cells 110 have exploded. Furthermore, the present disclosure can overcome the disadvantage of only checking the temperature of some of the battery cells 110 represented by the prior art, without detecting the explosion of battery cells 110 located far from the temperature sensor.

[0062] Figure 3 is a perspective view schematically illustrating a state of a battery module according to another embodiment of the present disclosure.

[0063] Reference Figure 3 In a battery module 100 according to another embodiment of the present disclosure, the piezoelectric sensor film 130 may be located outside the upper frame 121. For example, the piezoelectric sensor film 130 may have a size corresponding to the upper surface of the upper frame 121. The piezoelectric sensor film 130 may be positioned so as to be in close contact with the upper surface of the upper frame 121. The piezoelectric sensor film 130 may be configured to generate an electrical signal by the pressure of the gas ejected through the plurality of flow holes H1 when some of the plurality of battery cells 110 accommodated in the module housing 120 explode.

[0064] Therefore, according to this configuration of the present disclosure, the present disclosure includes a piezoelectric sensor film 130 located outside the upper frame 121. Therefore, when at least some of the plurality of battery cells 110 explode, an electrical signal generated by the explosion pressure from the piezoelectric sensor film 130 allows the control unit 140 to determine whether the battery cells 110 have exploded. Therefore, compared to conventional techniques that only measure the temperature of some of the battery cells 110, it is possible to quickly detect whether the plurality of battery cells 110 have exploded. Furthermore, the present disclosure can solve the following problem: when only checking the temperature of some of the battery cells 110, thermal runaway or explosion of battery cells 110 located far from the temperature sensor is not detected, or it takes a considerable amount of time to detect such thermal runaway or explosion.

[0065] In addition, return to Figure 2 The upper cover 123 of the present disclosure may include a partition wall 123a. The partition wall 123a may extend to surround the plurality of openings H2. The partition wall 123a may have a shape extending in a horizontal direction along the outer periphery of the upper cover 123. The partition wall 123a may have a shape protruding upward.

[0066] In addition, the piezoelectric sensor film 130 may be mounted on the partition wall 123a. That is, when mounted on the partition wall 123a, the piezoelectric sensor film 130 may be spaced apart from the plurality of openings H2 of the upper cover 123 by a predetermined distance in the upward and downward directions.

[0067] Therefore, according to this configuration of the present disclosure, by including the partition wall 123a in the upper cover 123, a space of a predetermined size can be ensured between the piezoelectric sensor film 130 and the plurality of battery cells 110, and thus a sufficient free space can be ensured in which the piezoelectric sensor film 130 may be displaced due to the explosion pressure of the battery cells 110. Therefore, the present disclosure can prevent the piezoelectric sensor film 130 from not detecting the explosion of the battery cells 110.

[0068] Figure 4 is a vertical cross-sectional view schematically illustrating a state of an upper cover and a piezoelectric sensor film of a battery module according to another embodiment of the present disclosure.

[0069] Reference Figure 4 ,and Figure 2 Compared to the battery module 100 of FIG. 1 , the battery module 100 according to another embodiment of the present disclosure may further include a slit 123 b in the upper cover 123 .

[0070] Specifically, in Figure 4 In the upper cover 123, a slit 123b may be formed on the inner surface of the partition wall 123a included in the upper cover 123. The slit 123b may have a shape extending in the horizontal direction along the inner surface of the partition wall 123a. Moreover, the slit 123b may be configured so that the outer peripheral portion of the piezoelectric sensor film 130 is inserted.

[0071] In addition, the piezoelectric sensor film 130 may be configured to be accommodated in a space surrounded by the partition wall 123a. A slit 123b may be formed in an inner middle portion of the partition wall 123a so that the piezoelectric sensor film 130 may be located at a middle height of the space of the partition wall 123a.

[0072] Therefore, according to this configuration of the present disclosure, the present disclosure includes the slit 123b into which the outer peripheral portion of the piezoelectric sensor film 130 is inserted and fixed, and the slit 123b is formed in the partition wall 123a. This makes it possible to stably fix the piezoelectric sensor film 130 and ensure a sufficient free space in which displacement of the piezoelectric sensor film 130 may occur due to the explosion pressure of the battery cell 110. Therefore, the present disclosure can prevent the piezoelectric sensor film 130 from not detecting the explosion of the battery cell 110.

[0073] Figure 5 is a perspective view schematically showing a state of a piezoelectric sensor film of a battery module according to another embodiment of the present disclosure.

[0074] Refer to it together Figure 5 and Figure 2 The piezoelectric sensor film 130 of the battery module 100 according to another embodiment of the present disclosure may have Figure 2 The piezoelectric sensor film 130 has different shapes. That is, Figure 2 The piezoelectric sensor film 130 has a rectangular sheet shape, and Figure 5 The piezoelectric sensor film 130 may include a plurality of sensing units 131 and a connection portion 132 connecting the plurality of sensing units 131 .

[0075] Specifically, the plurality of sensing units 131 may be positioned to respectively face the plurality of openings H2 (see FIG. Figure 2 ). That is, the plurality of sensing units 131 may have a shape corresponding to the plurality of openings H2 of the upper cover 123. The connection portion 132 may be a connection portion for connecting between the sensing units 131. For example, Figure 5 As shown, each of the plurality of sensing units 131 may have a shape extending longitudinally in the front-to-rear direction along the shape of each of the openings H2 of the upper cover 123. The connecting portion 132 may be configured to connect the front end portions of the plurality of sensing units 131 and to connect the rear end portions of the plurality of sensing units 131.

[0076] That is, when some of the plurality of battery cells 110 explode, the plurality of sensing units 131 are pressed and the gas is discharged to the outside through the opening H2, so the piezoelectric sensor film 130 can generate an electrical signal, and the electrical signal can be transmitted to the control unit 140 through the connecting portion 132.

[0077] Therefore, according to this configuration of the present disclosure, the present disclosure includes a plurality of sensing units 131 and a connecting portion 132 in the piezoelectric sensor film 130, thereby minimizing the portion of the piezoelectric sensor film 130 facing the upper cover 123 where pressure sensing is not required (i.e., the upper surface where the plurality of openings H2 are not formed), and thus, the occurrence of erroneous sensing caused by pressure due to the influence of external impact (such as a collision with the upper cover 123) rather than the explosion of the plurality of battery cells 110 can be minimized.

[0078] Figure 6 is a perspective view schematically showing a state of a piezoelectric sensor film of a battery module according to another embodiment of the present disclosure.

[0079] Reference Figure 6 ,and Figure 2 Compared to the piezoelectric sensor film 130 , the piezoelectric sensor film 130 may further include a cut portion 133 .

[0080] Specifically, Figure 6 The piezoelectric sensor film 130 may include a cut portion 133 in a portion corresponding to the plurality of flow holes H1. The cut portion 133 may be formed by linearly cutting a portion of the piezoelectric sensor film 130. That is, the cut portion 133 may be configured so that the portion of the piezoelectric sensor film 130 that is cut is easily bent by external pressure. For example, the cut portion 133 may be formed by cutting in a left direction, then in a rearward direction, and then in a right direction. That is, for example, when viewed from the front, the cut portion 133 may be cut in a "C" shape on a plane. When the battery cell 110 located below the cut portion 133 explodes, the cut portion 133 may be bent upward by the upwardly moving gas. In this case, an electrical signal may be generated from the bent cut portion 133.

[0081] In addition, the piezoelectric sensor film 130 may include a bending portion 134 configured so that a portion can be bent along a reference line by external pressure. For example, the bending portion 134 may be configured so that a portion of the piezoelectric sensor film 130 is pre-bent and easily bent by external pressure. For example, Figure 6 As shown, the bent portion 134 may be formed by pre-bending a portion of the cut portion 133. That is, the bent portion 134 may be formed by pre-bending an uncut portion of the cut portion 133.

[0082] Therefore, according to this configuration of the present disclosure, the present disclosure includes the cutout portion 133 and the bent portion 134. Therefore, when at least some of the plurality of battery cells 110 explode, the cutout portion 133 of the piezoelectric sensor film 130 can be easily bent with a large displacement due to the explosion pressure, thereby generating a relatively high voltage electrical signal. Therefore, the present disclosure can more clearly detect whether the battery cell 110 has exploded through the piezoelectric sensor film 130.

[0083] Figure 7 is a perspective view schematically showing a battery pack according to an embodiment of the present disclosure.

[0084] Reference Figure 7 , the battery pack 200 according to an embodiment of the present disclosure includes at least one battery module 100. The battery pack 200 may include a tray 210 configured to mount the battery module 100. In this case, as Figure 7 As shown, four battery modules 100 may be mounted on a tray.

[0085] Furthermore, in the battery pack 200, the piezoelectric sensor film 130 may be mounted on the plurality of battery modules 100 so as to cover the upper portions of the plurality of battery modules 100. That is, the piezoelectric sensor film 130 may have an area sufficient to cover the upper portions of the plurality of battery modules 100. A control unit 140 configured to detect whether a battery cell has exploded by analyzing an electrical signal transmitted from the piezoelectric sensor film 130 may be mounted in the tray 210. The battery pack 200 may further include various devices (not shown) for controlling the charging and discharging of the battery modules 100, such as a battery management system (BMS), a current sensor, a fuse, and the like.

[0086] In addition, the electric vehicle (not shown) according to the embodiment of the present disclosure includes at least one battery module 100. That is, in the electric vehicle according to the embodiment of the present disclosure, the battery module 100 according to the embodiment of the present disclosure described above may be installed in the vehicle body.

[0087] In addition, although terms indicating directions such as up, down, left, right, front, and back are used in this specification, it is obvious to those skilled in the art that these terms are merely for convenience of description and may vary depending on the position of the object or the position of the observer.

[0088] As described above, although the present disclosure has been described with reference to limited embodiments and drawings, the present disclosure is not limited thereto, and it is possible for ordinary technicians in the field to which the present disclosure belongs to make various modifications and changes to the present disclosure within the technical ideas of the present disclosure and the scope of equivalents of the claims to be described below.

[0089] [Explanation of Reference Numerals]

[0090] 100: Battery module 110: Battery cell

[0091] 120: Module housing H1, H2: flow hole, opening

[0092] 121, 122, 123: upper frame, lower frame, upper cover

[0093] 130: Piezoelectric sensor film 140: Control unit

[0094] 123a: Partition wall 123b: Slit

[0095] 150: Busbar 131, 132: Sensing unit, connection part

[0096] 133: Cutting part 134: Bending part

[0097] 200: Battery pack

Claims

1. A battery module, comprising: Multiple battery cells; a module case comprising an upper frame, a lower frame, and an upper cover, the upper frame being located above the plurality of battery cells and having a plurality of flow holes formed therein, the lower frame being located below the upper frame and including an accommodation space for accommodating at least a portion of each of the plurality of battery cells, the upper cover being located between the upper frame and the lower frame, being located above the plurality of battery cells, and including a plurality of openings configured to expose electrode terminals of the plurality of battery cells; a piezoelectric sensor film located between the upper frame and the upper cover or outside the upper frame, and configured to generate an electric signal when pressure is applied by an external force; as well as a control unit configured to receive the electrical signal generated from the piezoelectric sensor film and analyze whether the battery cell has exploded, The piezoelectric sensor film includes a cut portion that is linearly cut in a portion corresponding to the plurality of flow holes.

2. The battery module according to claim 1, wherein: The upper cover includes a partition wall extending to surround the plurality of openings and protruding upward.

3. The battery module according to claim 2, wherein: The piezoelectric sensor film is mounted on the partition wall.

4. The battery module according to claim 2, wherein: The piezoelectric sensor film is accommodated in a space surrounded by the partition wall, and The partition wall includes a slit configured so that an outer peripheral portion of the piezoelectric sensor film is inserted.

5. The battery module according to claim 4, wherein: The slit is formed in an inner middle portion of the partition wall so that the piezoelectric sensor film is located at a middle height of a space of the partition wall. The battery module according to claim 1 , wherein: The piezoelectric sensor film comprises: a plurality of sensing units positioned to respectively face the plurality of openings formed in the upper cover; and A connecting portion configured to connect between the plurality of sensing units.

7. The battery module according to claim 1, wherein: The cutting portion is cut in a C-shape on a plane.

8. The battery module according to claim 1, wherein: The piezoelectric sensor film includes a bending portion configured such that a portion can be bent along a reference line by external pressure.

9. The battery module according to claim 1, wherein: The control unit is configured to determine that at least some of the plurality of battery cells have exploded when receiving an electrical signal of a predetermined voltage or higher from the piezoelectric sensor film. 10 . A battery pack comprising at least one battery module according to claim 1 .

11. The battery pack according to claim 10, wherein: The battery pack includes a plurality of battery modules. The battery pack further includes a tray, The plurality of battery modules are mounted on the tray, and The piezoelectric sensor film is configured to cover upper portions of the plurality of battery modules. 12 . An electric vehicle comprising at least one battery module according to claim 1 .

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