Secondary battery pack

Abstract

The present invention relates to a secondary battery pack, and more particularly, to a secondary battery pack including a frame for supporting a plurality of secondary batteries. The present invention provides a secondary battery pack including a plurality of secondary batteries, a lower frame for supporting a lower portion of the plurality of secondary batteries, a plurality of side frames that are spaced apart from each other, extend upward from the lower frame, and define a number of separation spaces, and an upper frame that is provided above the side frames and is provided to be able to open and close each of the number of separation spaces.

Description

Technical Field

[0001] This application claims the benefit of priority based on 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, and all the contents disclosed in the documents of the Korean patent applications are incorporated herein by reference in their entirety.

[0002] The present invention relates to a secondary battery pack, and more particularly, to a secondary battery pack including a frame for supporting a plurality of secondary batteries.

Background Art

[0003] Recently, secondary batteries have been attracting attention as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), etc., which are presented as a means to solve air pollution caused by existing gasoline vehicles, diesel vehicles, etc. that use fossil fuels.

[0004] One or two to three secondary batteries are used in small mobile devices, while for medium and large devices such as electric vehicles, due to the need for high power and large capacity, battery modules in which a number of secondary battery cells are electrically connected or battery packs in which a plurality of battery modules are electrically connected to each other are used.

[0005] As an example, a battery module can be composed of a plurality of secondary batteries, busbars (or metal plates) for connecting the secondary batteries in series and / or in parallel, a sensing assembly for voltage and temperature sensing, electrical components for charge and discharge control, and a housing for accommodating them. Among the currently commercialized secondary batteries, one of the most prominent secondary batteries is the lithium secondary battery, which can be divided into a cylindrical type and a pouch type according to the form of the exterior material. Among these, the pouch-type secondary battery is widely used in medium and large battery modules due to its advantages of high energy density and easy stacking.

[0006] On the one hand, in recent years, as the demand for secondary battery modules mounted on vehicles has increased, customers have been demanding an increase in the energy density of secondary batteries within the limited space of the secondary battery modules. In this case, however, there has been a problem that the stability risks associated with the ignition and explosion of the secondary batteries have also increased accordingly.

[0007] In particular, when a secondary battery catches fire and explodes, high-temperature gas is discharged. In this case, if adjacent secondary batteries are continuously exposed to the high-temperature gas, a chain reaction of ignition can be promoted and a large explosion can occur.

[0008] Therefore, there is a situation where it is necessary to develop a technology to solve the above problems.

Summary of the Invention

Problems to be Solved by the Invention

[0009] The present invention has been derived to solve the above problems, and an object of the present invention is to provide a secondary battery pack that can prevent a chain reaction of ignition from occurring by isolating adjacent secondary batteries from high-temperature gas even when ignition occurs in a specific secondary battery and high-temperature gas is generated.

Means for Solving the Problems

[0010] The present invention provides a secondary battery pack including a plurality of secondary batteries, a lower frame that supports the lower portions of the plurality of secondary batteries, a plurality of side frames that are provided at intervals from each other, extend upward from the lower frame, and define a number of separation spaces, and an upper frame that is provided above the side frames and is provided to be able to open and close each of the number of separation spaces.

[0011] The upper frame can selectively open and close the separation spaces according to the pressure difference between the inside and the outside of the separation spaces.

[0012] The upper frame is provided above the side frame, and may include a base portion in which a number of gas discharge holes are formed corresponding to the positions of the plurality of separation spaces, and at least one opening / closing portion coupled to the base portion and opening or closing the gas discharge holes at positions corresponding to the gas discharge holes.

[0013] The upper frame may be coupled to the base portion and provided at a predetermined interval above the opening / closing portion so as to be separated from the opening / closing portion.

[0014] On the other hand, the secondary battery pack according to the present invention may further include a gas exhaust frame coupled to the lower frame and exhausting the gas discharged from the gas discharge holes to the outside.

[0015] At least one or more gas movement holes through which the gas discharged from the gas discharge holes move are formed in the base portion, and the gas exhaust frame can exhaust the gas that has moved from the gas movement holes to the outside in communication with the gas movement holes.

[0016] The gas exhaust frame may include a body portion in which an accommodation space is formed, and a rupture portion coupled to the body portion and rupturing when the pressure in the accommodation space is equal to or greater than a predetermined pressure.

[0017] At least one communication hole that communicates the gas movement hole and the accommodation space is formed in one region of the body portion, and at least one exhaust hole that exhausts the gas in the accommodation space to the outside is formed in another region, and the rupture portion may be provided at a position corresponding to the exhaust hole.

[0018] The gas discharge holes may be formed to extend along the length direction of the secondary battery on the base portion.

[0019] The gas discharge holes may be formed to extend along the arrangement direction of the plurality of secondary batteries on the base portion.

[0020] The opening and closing part may include a fixing part fixedly coupled to the base part, and a rotating part rotatably connected from the fixing part to open and close the gas discharge hole.

[0021] The fixing part can be fixedly coupled to the base part by welding or bolting.

[0022] At least one of the plurality of side frames may have a groove recessed inward on the surface facing the secondary battery.

Advantages of the Invention

[0023] In the present invention, the side frames define a number of separation spaces, and a plurality of secondary batteries are divided and arranged in the separation spaces. Thus, even if ignition occurs in a specific secondary battery and high-temperature gas is generated, the adjacent secondary batteries are not exposed to the high-temperature gas, so that the effect of preventing chain ignition can be achieved.

[0024] Further, the present invention further includes a gas exhaust frame for discharging the gas generated by the plurality of secondary batteries to the outside. The gas exhaust frame forms one gas discharge path, and the free volume through which the gas flows is increased. As a result, the maximum pressure during ignition is reduced, so that the deformation and destruction of the frame structure can be minimized.

[0025] Further, the present invention includes one exhaust hole and one rupture part in the gas exhaust frame, so that the number of parts of the rupture part can be reduced, and the manufacturing and management costs can be reduced.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3a

Figure 3b

Figure 4a

Figure 4b

Figure 5

Embodiments for Carrying Out the Invention

[0027] Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement it. However, the present invention can be realized in various different forms and is not limited or restricted by the following embodiments.

[0028] To clearly explain the present invention, detailed descriptions of parts not related to the explanation or related known technologies that may obscure the gist of the present invention are omitted. In this specification, when attaching reference numerals to the components of each drawing, the same or similar reference numerals are attached to the same or similar components throughout the specification.

[0029] Also, the terms and words used in this specification and the claims should not be construed as being limited to their ordinary or dictionary meanings. In accordance with the principle that the inventors can appropriately define the concept of the terms in order to explain their invention in the best way, they should be construed in meanings and concepts consistent with the technical idea of the present invention.

[0030] (Embodiment 1) The secondary battery pack 100 according to the present invention includes a plurality of secondary batteries 110, a lower frame 120 that supports the lower portions of the plurality of secondary batteries 110, a plurality of side frames 130 that are provided at intervals from each other, extend upward from the lower frame 120, and define a number of separation spaces, and an upper frame 140 that is provided above the side frames 130 and is provided to be able to open and close each of the number of separation spaces.

[0031] Here, the secondary battery 110 can be configured to include an electrode assembly and a battery case that houses the electrode assembly. Further, the electrode assembly can have a structure in which a positive electrode current collector / positive electrode active material layer / separator / negative electrode active material layer / negative electrode current collector are laminated in this order, and the positive electrode active material layer on one side of the separator faces the negative electrode active material layer on the other side. Further, the battery case can have various shapes and materials such as a cylindrical shape, a rectangular shape, and a pouch shape.

[0032] A plurality of such secondary batteries 110 can be provided, and in this case, they can be arranged in parallel along one direction. For example, as shown in FIG. 1, the secondary batteries 110 can be arranged in parallel along one direction (the Y direction with reference to FIG. 1). Further, the secondary batteries 110 arranged in parallel can be placed on the lower frame 120.

[0033] Specifically, the lower frame 120 is configured to support the lower portions of the plurality of secondary batteries 110, and various configurations are possible. For example, the lower frame 120 can have various materials and shapes.

[0034] On one hand, a plurality of side frames 130 are formed to extend upward (in the Z direction with reference to FIG. 1) on the lower frame 120, and can support the sides of the secondary battery 110. Here, a plurality of side frames 130 are formed separately from each other on the lower frame 120, so that a number of separation spaces can be defined. Also, in the separation spaces, the secondary batteries 110 can be arranged separately into a predetermined number. That is, a plurality of secondary batteries 110 can be arranged separately by a predetermined number by the side frames 130.

[0035] On one hand, at least one of the plurality of side frames 130 can have a groove 130a formed to be recessed inward on the surface facing the secondary battery 110.

[0036] Specifically, as shown in FIG. 2, a groove 130a can be formed to be recessed inward on the surface of the side frame 130 facing the secondary battery 110. In this case, since the contact area between the side frame 130 and the secondary battery 110 is reduced, there is an effect of minimizing the heat transfer between the secondary batteries 110 separated by one side frame 130.

[0037] Such a groove 130a can be formed in various shapes and sizes. For example, the groove 130a can be formed to extend along the height direction (in the Z direction with reference to FIG. 2) of the secondary battery 110.

[0038] On one hand, an upper frame 140 can be provided above the side frame 130 to open or close each of the multiple separation spaces.

[0039] Specifically, as shown in FIGS. 1 to 2, the upper frame 140 is provided above the side frame 130 and can be provided to open and close each of the multiple separation spaces. For example, the upper frame 140 can selectively open and close the separation spaces according to the pressure difference between the inside and the outside of the separation spaces.

[0040] More specifically, when one of the plurality of secondary batteries 110 catches fire, the upper frame 140 can open the separation space to which the fired secondary battery 110 belongs and release the gas in the separation space. Here, the upper frame 140 can prevent the secondary battery 110 disposed in the other separation space from being exposed to the high-temperature gas by closing the other separation space instead of the separation space to which the fired secondary battery 110 belongs. As a result, there is an effect of preventing the chain ignition of the secondary batteries 110.

[0041] The above upper frame 140 can have various structures.

[0042] For example, as illustrated in FIGS. 2 to 3b, the upper frame 140 is provided above the side frame 130, and includes a base portion 141 in which a plurality of gas discharge holes 141a are formed corresponding to the positions of the plurality of separation spaces, and at least one opening / closing portion 142 coupled to the base portion 141 and opening or closing the gas discharge holes 141a at positions corresponding to the gas discharge holes 141a.

[0043] Here, the base portion 141 is provided above the side frame 130, and is configured such that a plurality of gas discharge holes 141a are formed corresponding to the positions of the plurality of separation spaces, and various configurations are possible.

[0044] For example, the base portion 141 can have a plate shape in which a plurality of gas discharge holes 141a are formed in parallel. Here, as illustrated in FIG. 2, a gasket 160 for improving the watertightness of the secondary battery pack 100 can be further provided between the base portion 141 and the side frame 130. In this case, the gasket 160 can have the same and similar shapes as the base portion 141, and it goes without saying that through holes penetrating up and down can be formed in a region corresponding to the gas discharge holes 141a of the base portion 141.

[0045] Further, the gas discharge holes 141a can be formed in various ways on the base portion 141.

[0046] In this case, the gas discharge holes 141a can have various sizes and shapes according to the position of the separation space and the area of the separation space, etc.

[0047] Specifically, the gas discharge holes 141a can be formed to extend along the length direction (X direction in FIG. 1) of the secondary battery 110 on the base portion 141, or can also be formed to extend along the arrangement direction (Y direction in FIG. 1) of the plurality of secondary batteries 110 on the base portion 141.

[0048] On the other hand, as shown in FIGS. 3a to 3b, at least one or more gas movement holes 141b through which the gas discharged from the gas discharge holes 141a moves can be formed in the base portion 141.

[0049] Here, the gas movement holes 141b communicate with the communication holes 150a of the gas exhaust frame 150 described later, and can be understood as a configuration for moving the gas discharged from the gas discharge holes 141a to the communication holes 150a of the gas exhaust frame 150.

[0050] A plurality of such gas movement holes 141b can be formed in a number corresponding to the number of the plurality of gas discharge holes 141a. Also, one gas movement hole 141b can be provided adjacent to one gas discharge hole 141a corresponding to each other. Thereby, the gas discharged from any one of the gas discharge holes 141a can move to the communication hole 150a described later through the gas movement hole 141b adjacent to the gas discharge hole 141a.

[0051] On the one hand, as shown in FIGS. 4a to 4b, the gas discharge hole 141a can be opened and closed by the opening / closing part 142. Here, the opening / closing part 142 is coupled to the base part 141 and can be understood as being configured to open or close the gas discharge hole 141a at a position corresponding to the gas discharge hole 141a.

[0052] More specifically, as shown in FIG. 4a, when no gas is generated in the separation space where the secondary battery 110 is disposed and the internal pressure of the separation space is the same as or lower than the outside, the opening / closing part 142 closes the gas discharge hole 141a corresponding to the separation space, thereby preventing gas from flowing into the inside of the separation space.

[0053] Also, as shown in FIG. 4b, when gas is generated in a specific separation space where the secondary battery 110 is disposed and the internal pressure of the separation space increases, the opening / closing part 142 opens the gas discharge hole 141a corresponding to the separation space, thereby discharging the gas to the outside of the separation space.

[0054] Thereby, even if the secondary battery 110 disposed in a specific separation space catches fire and high-temperature gas is generated, the opening / closing part 142 can prevent the inflow of the high-temperature gas into the secondary battery 110 disposed in other separation spaces, and can prevent the chain ignition of the secondary batteries 110.

[0055] The above-mentioned opening / closing part 142 can have various structures.

[0056] For example, the opening / closing part 142 can include a fixing part 142a fixedly coupled to the base part 141 and a rotating part 142b rotatably connected from the fixing part 142a to open and close the gas discharge hole 141a.

[0057] Here, the fixing part 142a is configured to be fixedly coupled to the base part 141 and can be fixedly coupled to the base part 141 as shown in FIGS. 4a to 4b. In this case, the fixing part 142a can be fixedly coupled to the base part 141 by welding or bolting.

[0058] Also, the rotating part 142b is configured to be rotatably connected from the fixing part 142a to open and close the gas discharge hole 141a. One end is rotatably connected from the fixing part 142a, and the other end can be provided to be in contact with the base part 141. Here, the rotating part 142b can be rotatably provided to the fixing part 142a via a connecting part 142c.

[0059] On the other hand, the upper frame 140 can further include a cover part 143 that is coupled to the base part 141 and is provided at a predetermined distance from the opening and closing part 142 above the opening and closing part 142.

[0060] Here, as shown in FIG. 2, the cover part 143 can include a cover plate 143a and a plurality of protruding parts 143b that protrude from the cover plate 143a toward the base part 141 and are coupled to the base part 141. The protruding part 143b can be formed to extend along the length direction of the gas discharge hole 141a.

[0061] Here, the cover plate 143a can have various shapes. For example, the cover plate 143a has a shape corresponding to the shape of the above-described lower frame 120 and can cover the upper side of the plurality of secondary batteries 110.

[0062] Also, the protruding parts 143b are configured such that a plurality of them are spaced apart from each other at a predetermined interval from the cover plate 143a toward the base part 141 and can have various configurations.

[0063] Specifically, the protruding portion 143b protrudes from the cover plate 143a, and by separating the cover plate 143a from the above-described opening / closing portion 142, the rotating portion 142b of the opening / closing portion 142 can be made rotatable. In this case, the cover plate 143a and the opening / closing portion 142 can be separated by the height of the protruding portion 143b (the length in the Z direction with reference to FIG. 2).

[0064] Also, a plurality of the protruding portions 143b can be formed at predetermined intervals so as to be coupled to a region in the base portion 141 where the gas discharge holes 141a are not formed. Here, the protruding portion 143b can be formed to extend along the length direction of the gas discharge holes 141a from one end of the cover plate 143a to the other end located opposite to the one end. In this case, the protruding portion 143b can serve to isolate the gases discharged from the plurality of gas discharge holes 141a from each other and guide the movement of the gases to the above-described gas movement holes 141b.

[0065] Also, the structure of the protruding portion 143b of the cover portion 143 can be said to be an important technology as a core structure necessary for the gasket 160 to maintain the watertight characteristics between the separation spaces in which the secondary batteries are partitioned. The cover portion 143 can be coupled to the side frame 130 with a coupling bolt or the like. At this time, if there is no protruding portion 143b, the gasket 160 may be lifted during the process in which the coupling bolt penetrates the gasket 160 and is coupled to the side frame 130. In this case, the watertight characteristics between the separation spaces in which the secondary batteries are partitioned may be lost. Therefore, the protruding portion can play an important role in maintaining the watertight characteristics between the separation spaces in which the secondary batteries are partitioned.

[0066] On the other hand, the secondary battery pack 100 according to the present invention can discharge the gas generated from the above-described separation space to the outside. In this case, the secondary battery pack 100 according to the present invention can be coupled to the lower frame 120 and further include a gas exhaust frame 150 that exhausts the gas discharged from the gas discharge holes 141a to the outside.

[0067] Specifically, the gas exhaust frame 150 communicates with the gas transfer hole 141b of the base portion 141 described above and is configured to exhaust the gas that has moved from the gas transfer hole 141b to the outside, and various configurations are possible.

[0068] For example, the gas exhaust frame 150 can include a body portion 151 in which an accommodation space is formed, and a rupture portion 152 that is coupled to the body portion 151 and ruptures when the pressure in the accommodation space is equal to or higher than a predetermined pressure.

[0069] Specifically, since the accommodation space is formed inside the body portion 151, a flow space for the gas flowing in from the gas transfer hole 141b can be defined. Here, the accommodation space can form a single gas flow path. In this case, since the free volume through which the gas generated in the entire secondary battery pack 100 can flow is larger than that of a structure in which the accommodation space is partitioned to form a plurality of gas flow paths, the maximum pressure decreases during ignition of the secondary battery 110, and there is an effect of preventing deformation and destruction of the structure of the secondary battery pack 100.

[0070] Referring to FIG. 5, the gas flow path of the present invention can be more easily understood. That is, in FIG. 5, the gas generated from the plurality of secondary batteries 110 is discharged through the opening / closing portion 142, and the state in which the gas discharged from the opening / closing portion 142 flows while sharing a single path in the accommodation space of the body portion 151 is illustrated.

[0071] Here, although FIG. 5 illustrates that a plurality of opening / closing portions 142 are formed corresponding to the number of the plurality of secondary batteries 110, the opening / closing portion 142 can be provided in a number less than the number of the plurality of secondary batteries 110. Needless to say, when the secondary batteries 110 are provided in a predetermined number in the separation space, the opening / closing portion 142 can be provided corresponding to the number of the separation spaces.

[0072] On one hand, at least one communication hole 150a that communicates the gas transfer hole 141b and the accommodation space in one area and at least one exhaust hole 150b that exhausts the gas in the accommodation space to the outside in another area can be formed in the body portion 151.

[0073] Here, a plurality of communication holes 150a can be formed corresponding to the number and position of the gas transfer holes 141b. Here, the accommodation space can form one gas flow path, and the gas flowing in from the plurality of communication holes 150a can pass through the accommodation space and be exhausted to the outside through the exhaust hole 150b.

[0074] Here, on the body portion 151, various numbers of the communication holes 150a and the exhaust holes 150b can be formed respectively.

[0075] For example, a plurality of communication holes 150a can be formed corresponding to the number of the above-described gas transfer holes 141b, and one exhaust hole 150b can be formed. That is, the gas flowing in from the plurality of communication holes 150a can be exhausted to the outside through one exhaust hole 150b while sharing one path in the internal accommodation space.

[0076] On one hand, a rupture portion 152 that ruptures when the pressure in the accommodation space is equal to or higher than a predetermined pressure can be provided at a position corresponding to the exhaust hole 150b. The above rupture portion 152 has a structure with lower mechanical rigidity than the body portion 151, and can be understood as a structure that ruptures when the pressure inside the accommodation space of the body portion 151 is equal to or higher than a predetermined pressure.

[0077] That is, when the pressure in the accommodation space is less than the predetermined pressure, the rupture portion 152 is provided at a position corresponding to the exhaust hole 150b and can seal the exhaust hole 150b, and when the pressure in the accommodation space is equal to or higher than the predetermined pressure, it ruptures and can open the exhaust hole 150b.

[0078] Such a rupture part 152 can be coupled to the body part 151 in various ways. For example, the rupture part 152 can be coupled to the body part 151 by welding or bolting, etc., or can also be adhered to the body part 151 via an adhesive substance.

[0079] On the other hand, as described above, on the body part 151, when a plurality of the communication holes 150a are formed corresponding to the number of the above-described gas movement holes 141b and one exhaust hole 150b is formed, one rupture part 152 provided corresponding to the exhaust hole 150b can also be provided. In this case, since it is not necessary to provide a plurality of configurations of the rupture part 152, it is possible to have the effect of minimizing the manufacturing and management costs of the secondary battery pack 100 to which the rupture part 152 is applied.

[0080] (Embodiment 2) On the other hand, in Embodiment 2 of the present invention, there is a difference from Embodiment 1 in that the gas exhaust frame 150 of Embodiment 1 does not include the rupture part 152.

[0081] The content common to Embodiment 1 will be omitted as much as possible, and Embodiment 2 will be described centering on the differences. That is, it goes without saying that when the content not described in Embodiment 2 is necessary, it can be regarded as the content of Embodiment 1.

[0082] That is, in Embodiment 2 of the present invention, since the rupture part 152 that seals the exhaust hole 150b formed in the gas exhaust frame 150 is not included, the exhaust hole 150b can always maintain an open state. Thereby, the gas collected in the accommodation space can be quickly discharged to the outside.

[0083] However, when too much gas collected in the internal accommodation space of the body part 151 is discharged at the same time, there is a possibility that a flame may occur inside or outside the secondary battery pack 100. Therefore, the exhaust hole 150b is preferably formed with an appropriate size and number.

[0084] Here, it goes without saying that the size and number of the exhaust holes 150b can be appropriately selected so that the gas inside the accommodation space is discharged to the outside at an appropriate discharge amount or discharged while maintaining an appropriate discharge speed, according to the needs of the operator.

[0085] As described above, the present invention has been described with reference to limited embodiments and drawings. However, the present invention is not limited thereby, and various implementations are possible within the equivalent scope of the technical idea of the present invention and the scope of the claims described below by those having ordinary knowledge in the technical field to which the present invention pertains.

Explanation of Reference Numerals

[0086] 100 Secondary battery pack 110 Secondary battery 120 Lower frame 130 Side frame 130a Groove 140 Upper frame 141 Base portion 141a Gas discharge hole 141b Gas movement hole 142 Opening / closing portion 142a Fixed portion 142b Rotating portion 142c Connecting portion 143 Cover portion 143a Cover plate 143b Protruding portion 150 Gas exhaust frame 150a Communication hole 150b Exhaust hole 151 Body portion 152 Rupture portion 160 Gasket

Claims

1. A plurality of secondary batteries, A lower frame that supports the lower portions of the plurality of secondary batteries, A plurality of side frames that are provided separately from each other, extend upward from the lower frame, and define a number of separation spaces, A secondary battery pack including an upper frame provided above the side frames and configured to be able to open and close each of the number of separation spaces.

2. The secondary battery pack according to claim 1, wherein the upper frame selectively opens and closes the separation space according to a pressure difference between the inside and the outside of the separation space.

3. The upper frame, A base portion provided above the side frame and having a number of gas discharge holes formed corresponding to the positions of the number of separation spaces, The secondary battery pack according to claim 1, further including at least one opening / closing portion coupled to the base portion and configured to open or close the gas discharge holes at positions corresponding to the gas discharge holes.

4. The upper frame, The secondary battery pack according to claim 3, further including a cover portion coupled to the base portion and provided at a predetermined interval above the opening / closing portion so as to be separated from the opening / closing portion.

5. The secondary battery pack according to claim 3, further including a gas exhaust frame coupled to the lower frame and configured to exhaust the gas discharged from the gas discharge holes to the outside.

6. At least one or more gas movement holes through which the gas discharged from the gas discharge holes moves are formed in the base portion, The secondary battery pack according to claim 5, wherein the gas exhaust frame communicates with the gas movement holes and exhausts the gas that has moved from the gas movement holes to the outside.

7. The gas exhaust frame, A body portion having an accommodation space formed therein, The secondary battery pack according to claim 6, further including a rupture portion coupled to the body portion and configured to rupture when the pressure in the accommodation space is equal to or greater than a predetermined pressure.

8. In the body portion, At least one communication hole that communicates the gas movement hole and the accommodation space is formed in one region, and at least one exhaust hole that exhausts the gas in the accommodation space to the outside is formed in another region, The secondary battery pack according to claim 7, wherein the rupture portion is provided at a position corresponding to the exhaust hole.

9. The gas discharge holes, The secondary battery pack according to any one of claims 3 to 8, which are formed to extend along the length direction of the secondary battery on the base portion.

10. The gas discharge holes, The secondary battery pack according to any one of claims 3 to 8, which is formed to extend along the arrangement direction of the plurality of secondary batteries on the base portion.

11. The opening / closing portion includes a fixing portion fixedly coupled to the base portion, and a rotating portion rotatably connected from the fixing portion to open and close the gas discharge hole. The secondary battery pack according to any one of claims 3 to 8.

12. The secondary battery pack according to claim 11, wherein the fixing portion is fixedly coupled to the base portion by welding or bolting.

13. In at least one of the plurality of side frames, a groove recessed inward is formed on the surface facing the secondary battery. The secondary battery pack according to claim 1.

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