Secondary battery pack

Abstract

The present invention relates to a secondary battery pack, and more particularly, to a secondary battery pack including a frame supporting a plurality of secondary batteries. The present invention provides a secondary battery pack comprising: a plurality of secondary batteries; a lower frame configured to support a lower portion of each of the plurality of secondary batteries; a plurality of side frames disposed spaced apart from each other and vertically extending from the lower frame to define a plurality of separated spaces; and an upper frame disposed above the side frame and capable of opening and closing each of the plurality of partitioned spaces.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2022-0073088, filed on June 15, 2022, and Korean Patent Application No. 10-2022-0144784, filed on November 2, 2022, which are hereby incorporated by reference in their entirety. Technical Field

[0004] The present invention relates to a secondary battery pack, and more particularly, to a secondary battery pack including a frame supporting a plurality of secondary batteries. Background Art

[0005] Recently, secondary batteries have attracted much attention as energy sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and the like, and have been developed to solve limitations caused by existing gasoline and diesel vehicles using fossil fuels, such as air pollution.

[0006] Although one or two to three or four secondary batteries are used in small transfer devices, due to the demand for high power and large capacity in medium and large devices such as electric vehicles, a battery module in which multiple secondary battery cells are electrically connected to each other or a battery pack in which multiple battery modules are electrically connected to each other is used.

[0007] For example, a battery module may be composed of a plurality of secondary batteries, a bus bar (or metal plate) for connecting the secondary batteries in series and / or in parallel, a sensing component for sensing voltage and temperature, an electronic component for controlling charging / discharging, and a housing for accommodating the above components. Among the currently commercialized secondary batteries, one of the most popular secondary batteries may be a lithium secondary battery, which can be classified into a can-type secondary battery and a soft-pack secondary battery according to the shape of its external material. Among them, soft-pack secondary batteries are widely used in medium and large battery modules because of their high energy density and easy stacking.

[0008] As the demand for secondary battery modules mounted on vehicles has increased recently, customers are demanding an increase in the energy density of secondary batteries within the limited space of the secondary battery modules. In this case, there is a problem that the safety risks associated with the ignition and explosion of the secondary batteries are also increasing.

[0009] Specifically, when a secondary battery catches fire and explodes, high-temperature gas may be discharged. In this case, when adjacent secondary batteries are continuously exposed to the high-temperature gas, a chain fire may be promoted, and a large explosion may occur.

[0010] Therefore, technology development is needed to solve the above problems. Summary of the invention

[0011] Technical issues

[0012] The present invention is made to solve the above problems, and an object of the present invention is to provide a secondary battery pack in which, even if a specific secondary battery catches fire and generates high-temperature gas, adjacent secondary batteries are isolated from the high-temperature gas to prevent chain fire from occurring.

[0013] Technical Solution

[0014] The present invention provides a secondary battery pack, comprising: a plurality of secondary batteries; a lower frame configured to support the lower portion of each of the plurality of secondary batteries; a side frame provided in plurality, the plurality of side frames being spaced apart from each other and extending vertically from the lower frame to define a plurality of partition spaces; and an upper frame provided above the side frames and capable of opening and closing each of the plurality of partition spaces.

[0015] The upper frame may be configured to selectively open and close the partition space according to a pressure difference between the inside and the outside of the partition space.

[0016] The upper frame may include: a base portion, which is arranged above the side frame and in which a plurality of exhaust holes are defined corresponding to the positions of the separated spaces; and at least one switch portion, which is combined with the base portion and is configured to open or close the exhaust holes at positions corresponding to the exhaust holes.

[0017] The upper frame may be combined with the base portion and disposed above the switch portion at a predetermined distance from the switch portion.

[0018] The secondary battery pack may further include: a gas exhaust frame coupled to the lower frame and configured to discharge gas exhausted from the gas exhaust hole to the outside.

[0019] The base portion may have at least one gas transfer hole through which the gas exhausted from the exhaust hole is transferred, and the exhaust frame may be configured to communicate with the gas transfer hole so as to discharge the gas transferred from the gas transfer hole to the outside.

[0020] The exhaust frame may include a body part having an accommodation space therein, and a rupture part combined with the body part and ruptured when a pressure of the accommodation space is equal to or greater than a predetermined pressure.

[0021] The main body may have at least one connecting hole in one area and at least one discharge hole in another area, wherein the gas transfer hole and the accommodating space are connected to each other through the at least one connecting hole, the gas in the accommodating space is discharged to the outside through the at least one discharge hole, and the rupture portion may be set at a position corresponding to the discharge hole.

[0022] The exhaust hole may extend in the base portion along a length direction of the secondary battery.

[0023] The exhaust hole may extend in the base portion along an arrangement direction of the secondary batteries.

[0024] The switch part may include a fixing part fixedly combined with the base part; and a rotatable part rotatably combined with the fixing part to open and close the exhaust hole.

[0025] The fixing portion may be fixedly coupled to the base portion by welding or bolts.

[0026] At least one of the plurality of side frames may have an inwardly recessed groove at a surface facing the secondary battery.

[0027] Beneficial Effects

[0028] In the present invention, the side frame may define a plurality of partition spaces, and a plurality of secondary batteries may be arranged to be divided into a predetermined number in the partition spaces so that even if a specific secondary battery catches fire and generates high-temperature gas, adjacent secondary batteries are prevented from being exposed to the high-temperature gas, thereby preventing a chain fire of the secondary batteries.

[0029] In addition, the present invention may further include an exhaust frame for exhausting the gas generated from the plurality of secondary batteries to the outside. Therefore, since the exhaust frame provides a gas exhaust path to increase the free volume in which the gas flows, thereby reducing the maximum pressure during a fire, it can have the effect of minimizing deformation and damage of the frame structure.

[0030] Furthermore, the present invention may include a discharge hole and a rupture portion in the exhaust frame to reduce the number of components of the rupture portion, thereby reducing manufacturing and management costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is an exploded perspective view showing a secondary battery pack according to Embodiment 1 of the present invention.

[0032] Figure 2 It is shown Figure 1 A partial cross-sectional view of a secondary battery pack.

[0033] Figure 3a The switch section is closed. Figure 1 A plan view of a state of a partition space in a base portion of a secondary battery pack.

[0034] Figure 3b The switch part is opened. Figure 1 A plan view of a state of a partition space in a base portion of a secondary battery pack.

[0035] Figure 4a The switch section is closed. Figure 1 A sectional view of a state of a partition space in an upper frame of a secondary battery pack.

[0036] Figure 4b The switch part is opened. Figure 1 A sectional view of a state of a partition space in an upper frame of a secondary battery pack.

[0037] Figure 5 It is shown Figure 1 Schematic conceptual diagram of the gas flow path of a secondary battery pack. DETAILED DESCRIPTION

[0038] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. However, the present invention can be implemented in several different forms and is not limited or restricted by the following examples.

[0039] In order to clearly illustrate the present invention, detailed descriptions of parts that are not related to the specification or related known technologies that may unnecessarily obscure the main points of the present invention have been omitted, and in this specification, reference numerals are added to the components in the various drawings. In this case, the same or similar reference numerals are assigned to the same or similar elements throughout the specification.

[0040] Furthermore, the terms or words used in the specification and claims should not be restrictively interpreted as general meanings or dictionary-based meanings, but should be interpreted as meanings and concepts consistent with the scope of the present invention on the basis of the principle that the inventor can appropriately define the concepts of the terms to best describe and explain his or her invention.

[0041] Example 1

[0042] A secondary battery pack 100 according to the present invention may include: a plurality of secondary batteries 110; a lower frame 120 supporting the lower portion of each of the plurality of secondary batteries 110; a side frame 130 provided in plurality, the plurality of side frames 130 being spaced apart from each other and extending upward from the lower frame 120 to define a plurality of partition spaces; and an upper frame 140 provided above the side frames 130 and capable of opening and closing each of the plurality of partition spaces.

[0043] Here, the secondary battery 110 may include an electrode assembly and a battery case accommodating the electrode assembly. In addition, the electrode assembly may have a structure in which a positive electrode collector / positive electrode active material layer / separator / negative electrode active material layer / negative electrode collector are stacked in sequence so that the positive electrode active material layer disposed on one surface of the separator faces the negative electrode active material layer disposed on the other surface of the separator. In addition, the battery case may have various shapes and materials, such as cylindrical, prismatic, and soft-pack shapes.

[0044] The secondary battery 110 may be provided in plurality. In this case, the plurality of secondary batteries 110 may be arranged in one direction. Figure 1 As shown in , it is possible to move along one direction ( Figure 1 The secondary batteries 110 are arranged side by side in the Y direction (in the Y direction). In addition, the secondary batteries 110 arranged side by side may be located on the lower frame 120.

[0045] Specifically, the lower frame 120 may be configured to support a lower portion of each of the plurality of secondary batteries 110 and may have various configurations. For example, the lower frame 120 may have various materials and shapes.

[0046] A plurality of side frames 130 may be formed on the lower frame 120. Figure 1 The side frame 130 may extend in the Z direction to support the side surface of the secondary battery 110. Here, the side frame 130 may be provided in plurality, and the plurality of side frames may be spaced apart from each other to define a plurality of partition spaces with the lower frame 120. In addition, the secondary battery 110 may be provided to be divided into a predetermined number in the partition space. That is, the plurality of secondary batteries 110 may be provided to be isolated into a predetermined number by the side frame 130.

[0047] In at least one of the plurality of side frames 130 , a groove 130 a recessed inwardly may be defined at a surface facing the secondary battery 110 .

[0048] Specifically, Figure 2 As shown in FIG, in the side frame 130, a groove 130a that is inwardly concave may be defined on the surface facing the secondary battery 110. In this case, since the contact area between the side frame 130 and the secondary battery 110 is reduced, it has an effect of minimizing heat transfer between the secondary battery 110 isolated with one side frame 130 therebetween.

[0049] The groove 130a may be defined in various shapes and sizes. For example, the groove 130a may be formed along the height direction ( Figure 2 The Z direction in the figure extends.

[0050] An upper frame 140 capable of opening or closing each of the plurality of divided spaces may be disposed above the side frames 130 .

[0051] Specifically, Figure 1 and Figure 2 As shown in , the upper frame 140 may be disposed above the side frame 130 and configured to be able to open and close each of the plurality of partitioned spaces. For example, the upper frame 140 may selectively open and close the partitioned space according to the pressure difference between the inside and outside of the partitioned space.

[0052] In more detail, when one of the plurality of secondary batteries 110 catches fire, the upper frame 140 may open the partition space to which the secondary battery 110 that caught fire belongs to release the gas in the partition space. Here, the upper frame 140 may close the partition space other than the partition space to which the secondary battery 110 that caught fire belongs, so that the secondary battery 110 disposed in another partition space may not be exposed to high-temperature gas. Therefore, there is an effect of preventing the chain fire of the secondary battery 110.

[0053] The upper frame 140 may have various structures.

[0054] For example, Figures 2 to 3b As shown in the figure, the upper frame 140 may include: a base portion 141, which is arranged above the side frame 130 and in which a plurality of exhaust holes 141a are defined corresponding to the positions of the separation spaces; and at least one switch portion 142, which is coupled to the base portion 141 and opens or closes the exhaust holes 141a at positions corresponding to the exhaust holes 141a.

[0055] Here, the base part 141 may be a configuration disposed above the side frame 130 , and in the base part 141 , a plurality of exhaust holes 141 a are defined to correspond to positions of the partitioned spaces and may have various configurations.

[0056] For example, the base portion 141 may have a plate shape in which a plurality of exhaust holes 141a are defined side by side. Figure 2 As shown in FIG, a gasket 160 for improving the waterproofness of the secondary battery pack 100 may be further provided between the base portion 141 and the side frame 130. In this case, the gasket 160 may have the same or similar shape as the base portion 141, and may also define a through hole that vertically penetrates in a region of the base portion 141 corresponding to the exhaust hole 141a.

[0057] In addition, the exhaust hole 141 a may be defined in the base portion 141 in various manners.

[0058] In this case, the exhaust hole 141 a may have various sizes and shapes according to the position of the partition space and the area of ​​the partition space.

[0059] Specifically, the exhaust hole 141a may be formed on the base portion 141 along the length direction ( Figure 1 Alternatively, the base portion 141 may extend in the X direction along the arrangement direction of the plurality of secondary batteries 110 ( Figure 1 The Y direction in the figure extends.

[0060] like Figure 3a and Figure 3bAs shown in FIG. 1 , the base portion 141 may have at least one gas transfer hole 141 b through which the gas exhausted from the exhaust hole 141 a is transferred.

[0061] Here, the gas transfer hole 141 b may be understood as a configuration communicating with a communication hole 150 a of an exhaust frame 150 to be described later, such that gas exhausted from the exhaust hole 141 a is transferred to the communication hole 150 a of the exhaust frame 150 .

[0062] The gas transfer hole 141b may be provided in plurality and correspond to the number of the plurality of exhaust holes 141a. In addition, one gas transfer hole 141b may be provided to correspond to one exhaust hole 141a, so that one gas transfer hole 141b and one exhaust hole 141a are adjacent to each other. Therefore, the gas exhausted from one exhaust hole 141a may be transferred to the communication hole 150a to be described later through the gas transfer hole 141b adjacent to the exhaust hole 141a.

[0063] like Figure 4a to Figure 4b As shown in FIG. 1 , the exhaust hole 141a can be opened and closed by the switch portion 142. Here, the switch portion 142 can be coupled to the base portion 141, and can be understood as a configuration that opens or closes the exhaust hole 141a at a position corresponding to the exhaust hole 141a.

[0064] In more detail, Figure 4a As shown in FIG. 1 , when no gas is generated in the partition space where the secondary battery is disposed so that the internal pressure of the partition space is equal to or less than the external pressure, the switch part 142 can close the exhaust hole 114a corresponding to the partition space to prevent gas from being introduced into the partition space.

[0065] In addition, if Figure 4b As shown in FIG. 1 , when gas is generated in a specific partition space where the secondary battery 110 is disposed to increase the internal pressure of the partition space, the switch part 142 may open the exhaust hole 141 a corresponding to the partition space to exhaust the gas to the outside.

[0066] Therefore, even if the secondary battery 110 disposed in a specific partition space catches fire to generate high temperature gas, the switch portion 142 can prevent the high temperature gas from being introduced into the secondary batteries 110 disposed in other partition spaces, thereby preventing the secondary batteries 110 from catching fire in a chain reaction.

[0067] The switch part 142 may have various structures.

[0068] For example, the switch portion 142 may include a fixed portion 142 a fixedly coupled to the base portion 141 , and a rotatable portion 142 b rotatably connected to the fixed portion 142 a to open and close the exhaust hole 141 a .

[0069] Here, the fixing portion 142a may be configured to be fixedly coupled to the base portion 141 so that it may be fixedly coupled to the base portion 141, such as Figure 4a to Figure 4b In this case, the fixing portion 142a may be fixedly coupled to the base portion 141 by welding or bolts.

[0070] In addition, the rotatable portion 142b may be configured to be rotatably connected to the fixed portion 142a so as to open and close the exhaust hole 141a, and may have one end rotatably connected to the fixed portion 142a and the other end disposed in contact with the base portion 141. Here, the rotatable portion 142b may be rotatably provided to the fixed portion 142a through the connection portion 142c.

[0071] The upper frame 140 may further include a cover portion 143 coupled to the base portion 141 and disposed at an upper side of the switch portion 142 to be spaced apart from the switch portion 142 by a predetermined distance.

[0072] Here, if Figure 2 As shown in FIG. 1 , the cover portion 143 may include a cover plate 143a and a plurality of protrusions 143b protruding from the cover plate 143a toward the base portion 141 and coupled to the base portion 141. Each protrusion 143b may extend along a length direction of the exhaust hole 141a.

[0073] Here, the cap plate 143a may have various shapes. For example, the cap plate 143a may cover the upper side of each of the plurality of secondary batteries 110 while having a shape corresponding to the shape of the lower frame 120 described above.

[0074] In addition, the plurality of protrusions 143 b may be spaced apart a predetermined distance from the cover plate 143 a toward the base portion 141 , and may have various configurations.

[0075] Specifically, the protrusion 143b may protrude from the cover plate 143a to space the cover plate 143a from the switch portion 142, thereby enabling the rotatable portion 142b of the switch portion 142 to rotate. In this case, the cover plate 143a and the switch portion 142 may be spaced apart from each other by the height of the protrusion 143b ( Figure 2 in the Z direction).

[0076] In addition, the plurality of protrusions 143b may be spaced a predetermined distance apart from each other so as to be coupled to an area of ​​the base portion 141 where the exhaust hole 141a is not generated. In this case, the protrusion 143b may extend from one end of the cover plate 143a to the other end opposite to the one end along the length direction of the exhaust hole 141a. In this case, the protrusion 143b may be used to isolate the gases exhausted from the plurality of exhaust holes 141a from each other and guide the gases to be transferred to the above-mentioned gas transfer hole 141b.

[0077] In addition, the structure of the protrusion 143b of the cover portion 143 can be regarded as an important technology as a core structure necessary for the gasket 160 to maintain the waterproofness between the partitions in which the secondary batteries are divided. The cover portion 143 can be coupled to the side frame 130 by a coupling bolt or the like. Here, if there is no protrusion 143b, the gasket 160 may be lifted in the process of coupling the coupling bolt to the side frame 130 by passing the gasket 160. In this case, the waterproofness between the partitions in which the secondary batteries are divided may fail. Therefore, the protrusion can play an important role in maintaining the waterproofness between the partitions in which the secondary batteries are divided.

[0078] The secondary battery pack 100 according to the present invention may exhaust the gas generated from the above-mentioned partition space to the outside. In this case, the secondary battery pack 100 according to the present invention may further include an exhaust frame 150 coupled to the lower frame 120 to discharge the gas exhausted from the exhaust hole 141a to the outside.

[0079] Specifically, the exhaust frame 150 may communicate with the above-mentioned gas transfer hole 141 b of the base portion 141 to discharge the gas transferred from the gas transfer hole 141 b to the outside.

[0080] For example, the exhaust frame 150 may include a body part 151 in which an accommodation space is defined, and a rupture part 152 coupled to the body part 151 and ruptured when the pressure in the accommodation space exceeds a predetermined pressure.

[0081] Specifically, the main body 151 may have a containing space therein to define a flow space for the gas introduced from the gas transfer hole 141b. Here, the containing space may define a gas flow path. Here, since the free volume of the gas flow generated in the entire secondary battery pack 100 is greater than the volume of the structure in which the containing space is divided to define a plurality of gas flow paths, the maximum pressure when the secondary battery 110 catches fire can be reduced to prevent the secondary battery pack 100 from structural deformation and damage.

[0082] Reference Figure 5 , the gas flow path of the present invention can be more easily understood. That is, Figure 5 A state is shown in which the gas generated from the plurality of secondary batteries 110 is exhausted through the opening / closing portion 142 and the gas exhausted from the opening / closing portion 142 flows through one path in the accommodation space of the shared body portion 151 .

[0083] Here, although Figure 5The structure in which the plurality of switch parts 142 are provided to correspond to the number of the plurality of secondary batteries 110 is shown, but the number of switch parts 142 may be less than the number of the plurality of secondary batteries 110. When the secondary batteries 110 are provided in a predetermined number in the partition space, the number of the secondary batteries 110 may correspond to the number of the partition space.

[0084] The main body 151 may have at least one connecting hole 150a in one area and at least one exhaust hole 150b in another area, wherein the at least one connecting hole 150a connects the gas transfer hole 141b and the accommodating space to each other, and the gas in the accommodating space is discharged to the outside through the at least one exhaust hole 150b.

[0085] Here, the communicating hole 150a may be provided in plurality to correspond to the number of the gas transfer holes 141b and the positions of the gas transfer holes 141b. In this case, the accommodating space may provide a gas flow path, and the gas introduced from the plurality of communicating holes 150a may pass through the accommodating space and then be discharged to the outside via the discharge hole 150b.

[0086] Here, the communication holes 150 a and the discharge holes 150 b may be provided in different numbers in the body part 151 .

[0087] For example, a plurality of communication holes 150a may be provided to correspond to the number of the gas transfer holes 141b, and a single discharge hole 150b may be provided. That is, the gas introduced from the plurality of communication holes 150a may share a path in the internal accommodation space and may be discharged to the outside through one discharge hole 150b.

[0088] The rupture portion 152 that ruptures when the pressure in the accommodation space is greater than a predetermined pressure may be provided at a position corresponding to the discharge hole 150b. The mechanical rigidity of the rupture portion 152 may be less than that of the main body 151, and may be understood as a configuration that ruptures when the pressure inside the accommodation space of the main body 151 exceeds a predetermined pressure.

[0089] That is, when the pressure of the accommodating space is less than a predetermined pressure, the rupture portion 152 may be disposed at a position corresponding to the discharge hole 150b to seal the discharge hole 150b, and when the pressure of the accommodating space is equal to or greater than the predetermined pressure, the rupture portion 152 may rupture to open the discharge hole 150b.

[0090] The rupture part 152 may be coupled to the body part 151 in various ways. For example, the rupture part 152 may be coupled to the body part 151 by welding or bolts, or may be bonded to the body part 151 by an adhesive material.

[0091] As described above, when the plurality of communication holes 150a corresponds to the number of the above-mentioned gas transfer holes 141b in the main body 151, and the discharge hole 150b is provided as one, the rupture part 152 provided corresponding to the discharge hole 150b may also be provided as one. In this case, since it is not necessary to provide a plurality of rupture parts 152, the manufacturing and management costs of the secondary battery pack 100 to which the rupture parts 152 are applied can be minimized.

[0092] Example 2

[0093] The difference between the second embodiment of the present invention and the first embodiment is that the exhaust frame 150 of the first embodiment is not provided with the rupture portion 152 .

[0094] The contents repeated with Embodiment 1 will be omitted as much as possible, and the description will focus on the differences of Embodiment 2. That is, it is obvious that the contents not described in Embodiment 2 can be regarded as the contents of Embodiment 1 if necessary.

[0095] That is, in Embodiment 2 of the present invention, since the rupture part 152 for sealing the discharge hole 150b defined in the exhaust frame 150 is not provided, the discharge hole 150b can always be kept in an open state. Therefore, the gas collected in the accommodation space can be quickly discharged to the outside.

[0096] However, if a large amount of gas collected in the accommodation space inside the body part 151 is discharged at once, there is a possibility of generating a flame inside or outside the secondary battery pack 100, so the exhaust holes 150b may be preferably provided in an appropriate size and number.

[0097] Here, the size and number of the discharge holes 150b may be appropriately selected so that the gas inside the accommodating space is discharged to the outside at an appropriate discharge rate, or is discharged while maintaining an appropriate discharge rate according to the needs of the operator.

[0098] While embodiments of the present invention have been described with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

[0099] [Explanation of Reference Numerals]

[0100] 100: Secondary battery pack

[0101] 110: Secondary battery

[0102] 120: Lower frame

[0103] 130: Side frame

[0104] 130a: Groove

[0105] 140: Upper frame

[0106] 141: Base

[0107] 141a: Exhaust hole

[0108] 141b: Gas transfer hole

[0109] 142: Switch Department

[0110] 142a: Fixed part

[0111] 142b: Rotatable part

[0112] 142c: Connection

[0113] 143: Cover

[0114] 143a: Cover

[0115] 143b: protrusion

[0116] 150: Exhaust frame

[0117] 150a: Connecting hole

[0118] 150b: Drain hole

[0119] 151: Main body

[0120] 152: Rupture

[0121] 160: Washer

Claims

1. A secondary battery pack, comprising: a plurality of secondary batteries; a lower frame configured to support a lower portion of each of the plurality of secondary batteries; A plurality of side frames, each of which is spaced apart from the other and vertically extends from the lower frame to define a plurality of partitioned spaces; as well as An upper frame is disposed above the side frames and is capable of opening and closing each of the plurality of divided spaces.

2. The secondary battery pack according to claim 1, wherein: The upper frame is configured to selectively open and close the partition space according to a pressure difference between the inside and the outside of the partition space.

3. The secondary battery pack according to claim 1, wherein: The upper frame comprises: a base portion disposed above the side frame and having a plurality of exhaust holes defined in the base portion corresponding to positions of the partitioned spaces; and At least one switch portion is combined with the base portion and configured to open or close the exhaust hole at a position corresponding to the exhaust hole.

4. The secondary battery pack according to claim 3, wherein: The upper frame further includes a cover portion coupled to the base portion and disposed above the switch portion at a predetermined distance from the switch portion.

5. The secondary battery pack according to claim 3, further comprising: The exhaust frame is combined with the lower frame and is configured to discharge the gas exhausted from the exhaust hole to the outside.

6. The secondary battery pack according to claim 5, wherein: The base portion has at least one gas transfer hole, and the gas exhausted from the exhaust hole is transferred through the at least one gas transfer hole, and The exhaust frame is configured to communicate with the gas transfer hole to discharge the gas transferred from the gas transfer hole to the outside.

7. The secondary battery pack according to claim 6, wherein: The exhaust frame comprises: a main body portion having a receiving space therein; and The rupture portion is combined with the main body portion and ruptures when the pressure of the accommodation space is equal to or greater than a predetermined pressure.

8. The secondary battery pack according to claim 7, wherein: The main body has at least one communicating hole in one region and at least one exhaust hole in another region, the gas transfer hole and the accommodation space are connected to each other through the at least one communicating hole, and the gas in the accommodation space is exhausted to the outside through the at least one exhaust hole, and The rupture portion is provided at a position corresponding to the discharge hole.

9. The secondary battery pack according to claim 3, wherein: The exhaust hole extends in the base portion along a length direction of the secondary battery.

10. The secondary battery pack according to claim 3, wherein: The exhaust hole extends in the base portion along an arrangement direction of the secondary batteries.

11. The secondary battery pack according to claim 3, wherein: The switch unit comprises: a fixing portion fixedly coupled to the base portion; and The rotatable part is rotatably combined with the fixing part to open and close the exhaust hole.

12. The secondary battery pack according to claim 11, wherein: The fixing portion is fixedly combined with the base portion by welding or bolts.

13. The secondary battery pack according to claim 1, wherein: At least one of the plurality of side frames has an inwardly recessed groove on a surface facing the secondary battery.

Images