Battery pack

Abstract

The technical concept of the present invention provides a battery pack comprising: a battery pack frame having an accommodation space; a battery cell assembly accommodated in the accommodating space of the battery pack frame and including a battery cell; and an exhaust device mounted to the battery pack frame and configured to open or close the internal passage according to a pressure of an accommodation space of the battery pack frame, in which the exhaust device is completely accommodated in an exhaust passage of the battery pack frame, the exhaust passage being disposed between an inner wall and an outer wall of the battery pack frame.

Description

TECHNICAL FIELD

[0001] The disclosure relates to a battery pack, and more particularly, to a battery pack including an exhaust device.

[0002] This application claims the benefit of Korean Patent Application No. 10-2024-0032552, filed March 7, 2024, the disclosure of which is incorporated herein by reference. BACKGROUND

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices, including cell phones, laptop computers, and cordless vacuum cleaners. In recent years, the main use of secondary batteries has shifted from mobile devices to mobility, as energy density improvements and economies of scale have significantly reduced the manufacturing cost per unit capacity of secondary batteries and increased the range of battery electric vehicles (BEVs) to be comparable to fuel vehicles.

[0004] As the mobility use of secondary batteries, the demand for their safety is growing. In the event of an accident, such as a fire, in a secondary battery for mobility, the life of the driver can be threatened, so it is essential to research technologies to improve the safety of secondary batteries. SUMMARY

[0005] TECHNICAL PROBLEM

[0006] The technical challenge of the disclosure is to provide a battery pack including an exhaust device.

[0007] TECHNICAL SOLUTION

[0008] To solve the above challenge, the technical idea of the disclosure provides a battery pack including: a battery pack frame having an accommodation space; a battery cell assembly accommodated in the accommodation space of the battery pack frame and including a battery cell; and an exhaust device mounted on the battery pack frame and configured to open and close an internal passage in response to a pressure in the accommodation space of the battery pack frame, wherein the exhaust device is completely accommodated within an exhaust passage of the battery pack frame, the exhaust passage being provided between an inner wall and an outer wall of the battery pack frame.

[0009] In an exemplary embodiment, the venting device includes: a base plate mounted to the inner wall of the battery pack frame and having a channel communicating with a through hole in the inner wall of the battery pack frame; an open / close cover configured to open and close the channel of the base plate; a spring providing elasticity to the open / close cover to close the channel in the base plate; and a cover body fixed to the base plate and supporting the spring.

[0010] In an exemplary embodiment, the open / close cover is configured to move between a closed position that closes the channel of the base plate and an open position that opens the channel of the base plate, wherein the closed position of the open / close cover is closer to the inner wall than the open position of the open / close cover, wherein the spring is configured to press the open / close cover in a direction from the outer wall toward the inner wall.

[0011] In an exemplary embodiment, when the open / close cover is in the closed position, the spring does not penetrate into the receiving space of the battery pack frame.

[0012] In an exemplary embodiment, one end of the spring contacts the cover, and the other end of the spring contacts the open / close cover.

[0013] In an exemplary embodiment, the cover includes a protrusion that supports the spring.

[0014] In an exemplary embodiment, the battery pack further includes: a fastening bolt connected to the inner wall of the battery pack frame and including a protrusion projecting from the inner wall of the battery pack frame in a direction from the inner wall of the battery pack frame toward the outer wall of the battery pack frame; and a nut threadedly connected to the protrusion of the fastening bolt, wherein the base plate includes a fastening hole into which the protrusion of the fastening bolt is inserted, and the base plate is secured to the inner wall of the battery pack frame by fitting the nut into the protrusion of the fastening bolt.

[0015] In an exemplary embodiment, the base plate presses against the surface of the inner wall of the battery pack frame facing the outer wall of the battery pack frame.

[0016] In an exemplary embodiment, the outer wall of the battery pack frame includes a through hole that connects the venting passage of the battery pack frame to an external space outside the battery pack frame.

[0017] In an exemplary embodiment, the venting device is exposed to the outside through the through-hole in the outer wall of the battery pack frame.

[0018] In an exemplary embodiment, the battery pack frame includes a bottom frame supporting the battery cell assembly and a side frame on the bottom frame, wherein the venting device is mounted on the side frame.

[0019] In an exemplary embodiment, the battery pack further includes a battery pack cover coupled to the side frame to cover the battery cell assembly housed within the battery pack frame.

[0020] Beneficial effects

[0021] According to an exemplary embodiment of this disclosure, the venting device is installed on the battery pack frame so that it does not occupy the space of the battery pack frame for housing battery cells, thereby improving the space utilization and energy density of the battery pack.

[0022] According to an exemplary embodiment of this disclosure, the venting device is mounted on the battery pack frame so as not to occupy the housing space of the battery pack frame, so that the venting device can be mounted on different parts of the battery pack frame without being limited by the installation position and number of valve structures.

[0023] The effects obtainable from the exemplary embodiments of this disclosure are not limited to those mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art from the following description. That is, those skilled in the art can also derive unintended effects from practicing the exemplary embodiments of this disclosure. Attached Figure Description

[0024] Figure 1 This is a perspective view showing a battery pack according to an exemplary embodiment of the present disclosure.

[0025] Figure 2 This is a side view showing a portion of a battery pack according to an exemplary embodiment of the present disclosure.

[0026] Figure 3 This is a side view showing an exhaust device according to an exemplary embodiment of the present disclosure.

[0027] Figure 4 This is a cross-sectional view of the battery pack with the exhaust device closed.

[0028] Figure 5 This is a cross-sectional view of the battery pack with the exhaust device in the open position.

[0029] Figure 6a and Figure 6bThis is a cross-sectional view illustrating a method for manufacturing a battery pack according to an exemplary embodiment of the present disclosure. Detailed Implementation

[0030] In the following, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that the terms and words used in this specification and claims should not be interpreted in their ordinary or dictionary sense, but rather on the basis of the principles by which the inventor can define the concepts of the terms, in a manner that he considers best suited to describe his disclosure, and in a meaning and concept consistent with the technical concept of the present disclosure.

[0031] Therefore, it should be understood that the embodiments described herein and the configurations shown in the accompanying drawings are merely the most preferred embodiments of this disclosure, and not an exhaustive list of the technical concepts of this disclosure, and various equivalents and modifications may exist that can replace them at the time of submission.

[0032] Furthermore, in describing this disclosure, specific descriptions of relevant known configurations or features have been omitted where such detailed description would obscure the nature of this disclosure.

[0033] Because embodiments of this disclosure are provided to explain this disclosure more fully to those skilled in the art, the shapes and dimensions of components in the drawings may be exaggerated, omitted, or shown schematically for clarity. Therefore, the dimensions or proportions of each component do not necessarily indicate its actual size or proportion.

[0034] (First Implementation)

[0035] Figure 1 This is a perspective view showing a battery pack 10 according to an exemplary embodiment of the present disclosure. Figure 2 This is a side view showing a portion of a battery pack 10 according to an exemplary embodiment of the present disclosure. Figure 3 This is a side view showing an exhaust device 100 according to an exemplary embodiment of the present disclosure. Figure 4 and Figure 5 This is a cross-sectional view showing a portion of a battery pack 10 according to an exemplary embodiment of the present disclosure, wherein Figure 4 This is a cross-sectional view showing the battery pack 10 with the exhaust device 100 in the closed state, and Figure 5 This is a cross-sectional view showing the battery pack 10 with the exhaust device 100 in the open state.

[0036] Reference Figures 1 to 5 The battery pack 10 may include a battery pack frame 200, a battery pack cover 310, a battery cell assembly 400, and an exhaust device 100.

[0037] The battery pack frame 200 provides a receiving space 291 in which the battery cell assembly 400 and various electrical components are housed. The battery pack frame 200 may include a bottom frame 210 and side frames 250. The bottom frame 210 and side frames 250 define the receiving space 291.

[0038] The bottom frame 210 can support the battery cell assembly 400. The bottom frame 210 can have a generally flat plate shape extending in a first horizontal direction (e.g., the X direction) and a second horizontal direction (e.g., the Y direction).

[0039] The side frame 250 may be disposed on the edge of the bottom frame 210 and may extend continuously along the edge of the bottom frame 210 to enclose the battery cell assembly 400. For example, the side frame 250 may include a first segment and a second segment opposite each other in a first horizontal direction (e.g., the X direction), and a third segment and a fourth segment opposite each other in a second horizontal direction (e.g., the Y direction). The first segment of the side frame 250 may be located at the front of the battery pack 10, and the second segment of the side frame 250 may be located at the rear of the battery pack 10.

[0040] The side frames 250 and bottom frames 210 of the battery pack frame 200 may each include an inner wall 261 and an outer wall 263. The inner wall 261 may define a receiving space 291 for the battery pack frame 200. The outer wall 263 may include the exterior of the battery pack frame 200 and may be exposed to an external space ES outside the battery pack frame 200. The inner wall 261 and the outer wall 263 may be spaced apart from each other and may provide space between the inner wall 261 and the outer wall 263. An exhaust passage 265 may be disposed between the inner wall 261 and the outer wall 263 of the battery pack frame 200. The exhaust passage 265 may guide the flow of gas inside the battery pack frame 200 and may include an installation space therein where an exhaust device 100 is installed.

[0041] The battery pack cover 310 can be attached to the battery pack frame 200 to cover the battery cell assembly 400 housed within the battery pack frame 200. The battery pack cover 310 can cover the receiving space 291 of the battery pack frame 200, thereby closing the receiving space 291. The battery pack cover 310 can be attached to the upper end of the side frame 250. The battery pack cover 310 can have a generally flat plate shape extending in a first horizontal direction (e.g., the X direction) and a second horizontal direction (e.g., the Y direction).

[0042] Battery cell assembly 400 may be disposed within receiving space 291 of battery pack frame 200. Battery cell assembly 400 may correspond to battery module or cell-to-battery pack structure. Battery pack 10 may include one or more battery cell assemblies 400. In an exemplary embodiment, battery pack 10 may include a plurality of battery cell assemblies 400 arranged along a first horizontal direction (e.g., X direction) and / or a second horizontal direction (e.g., Y direction).

[0043] Battery cell assembly 400 may include multiple battery cells. Each battery cell is a basic unit of a lithium-ion battery, i.e., a secondary battery. Each battery cell may include an electrode assembly, an electrolyte, and a cell housing. The electrode assembly embedded in the cell housing may include a positive electrode, a negative electrode, and a separator inserted between the positive and negative electrodes. Depending on the form of the assembly, the electrode assembly may be either a wound type or a stacked type. A wound type electrode assembly may include a wound structure of a positive electrode, a negative electrode, and a separator inserted between the positive and negative electrodes. A stacked type electrode assembly may include multiple positive electrodes and multiple negative electrodes stacked in sequence, and multiple separators inserted between the multiple positive electrodes and multiple negative electrodes. The positive electrode may include a positive electrode current collector and a positive electrode active material. The negative electrode may include a negative electrode current collector and a negative electrode active material.

[0044] Multiple battery cells can be connected in series and / or in parallel. In one example, multiple battery cells can be connected in series with each other. In one example, multiple battery cells can be connected in parallel with each other. In one example, when a group of two or more battery cells connected in parallel with each other is defined as a bank, a group of two or more battery cells connected in parallel with each other and another group of two or more battery cells connected in parallel with each other can be connected in series with each other.

[0045] Each battery cell can be a pouch cell, a cylindrical cell, or a prismatic cell. The electrode assembly of a pouch cell is embedded in a pouch cell housing including aluminum laminates. The electrode assembly of a cylindrical cell is embedded in a cylindrical metal can. The electrode assembly of a prismatic cell is embedded in a prismatic metal can.

[0046] The exhaust device 100 can be mounted to the battery pack frame 200. Figure 1 In the diagram, the exhaust device 100 is shown mounted to a first section of the side frame 250 at the front of the side frame 250, but is not limited thereto, and the exhaust device 100 may be mounted to at least one section of the side frame 250, and may also be mounted to the bottom frame 210.

[0047] The venting device 100 can be configured to open and close the internal passage based on the pressure in the housing space 291 of the battery pack frame 200. The venting device 100 can be configured to switch between a closed state and an open state based on the pressure in the housing space 291 of the battery pack frame 200.

[0048] When the exhaust device 100 is closed, it can close the passage between the external space ES and the housing space 291 of the battery pack frame 200, thereby blocking gas flow between them. When the exhaust device 100 is open, it can open the passage between the external space ES and the housing space 291 of the battery pack frame 200, allowing gas flow between them.

[0049] When the pressure in the housing space 291 of the battery pack frame 200 is lower than a preset threshold, the venting device 100 can be in a closed state, and when the pressure in the housing space 291 of the battery pack frame 200 exceeds the preset threshold, the venting device 100 can be in an open state. When the pressure in the housing space 291 of the battery pack frame 200 exceeds the preset threshold, the venting device 100 can be in an open state, and the gas in the housing space 291 of the battery pack frame 200 can be released into the external space ES to release the pressure in the housing space 291 of the battery pack frame 200. When the pressure in the housing space 291 of the battery pack frame 200 is released so that the pressure in the housing space 291 of the battery pack frame 200 is lower than the preset threshold, the venting device 100 can switch from the open state to the closed state.

[0050] The venting device 100 can be installed within the venting channel 265 provided between the inner wall 261 and the outer wall 263 of the battery pack frame 200. In an exemplary embodiment, the venting device 100 can be installed to the battery pack frame 200 such that its entirety is accommodated within the venting channel 265 of the battery pack frame 200. In an exemplary embodiment, the venting device 100 can be completely disposed between the inner wall 261 and the outer wall 263 of the battery pack frame 200. In an exemplary embodiment, the components of the venting device 100 can be installed to the battery pack frame 200 such that they do not penetrate the accommodating space 291 of the battery pack frame 200. When the venting device 100 is installed to the side frame 250, the thickness of the venting device 100 along the thickness direction of the side frame 250 can be less than the thickness of the side frame 250. When the venting device 100 is installed on the bottom frame 210, the thickness of the venting device 100 along the thickness direction of the bottom frame 210 can be less than the thickness of the bottom frame 210.

[0051] The inner wall 261 of the battery pack frame 200 may include a through hole 2611 communicating with the receiving space 291 of the battery pack frame 200. The outer wall 263 of the battery pack frame 200 may include a through hole 2631 communicating with the external space ES. The venting passage 265 of the battery pack frame 200 may communicate with the external space ES through the through hole 2631 in the outer wall 263. The venting device 100 may be exposed to the outside of the battery pack 10 through the through hole 2631 in the outer wall 263 of the battery pack frame 200.

[0052] The exhaust device 100 may include a base plate 110, an open / close cover 120, a spring 130, and a cover body 140.

[0053] The base plate 110 can be mounted to the inner wall 261 of the battery pack frame 200. The base plate 110 can press against the outer surface of the inner wall 261 of the battery pack frame 200 facing the outer wall 263. The base plate 110 may include a channel 111 communicating with a through hole 2611 in the inner wall 261 of the battery pack frame 200. The channel 111 of the base plate 110 can communicate with the receiving space 291 of the battery pack frame 200 through the through hole 2611 in the inner wall 261 of the battery pack frame 200. A sealing ring may be disposed between the inner walls 261 of the battery pack frame 200 to prevent gas leakage.

[0054] The open / close cover 120 can open and close the channel 111 of the base plate 110. Depending on the pressure in the receiving space 291 of the battery pack frame 200, the open / close cover 120 can switch between a closed position that closes the channel 111 of the base plate 110 and an open position that opens the channel 111 of the base plate 110. When the venting device 100 is closed, the open / close cover 120 can be in the closed position. When the venting device 100 is open, the open / close cover 120 can be in the open position. The open / close cover 120 can be opened / closed to move linearly between the open and closed positions. The closed position of the open / close cover 120 can be closer to the inner wall 261 than the open position of the open / close cover 120.

[0055] When the open / close cover 120 is in the closed position, it closes the passage 111 from the base plate 110 to the external space ES, preventing the passage 111 from communicating with the external space ES. When the open / close cover 120 is in the closed position, it also blocks gas flow between the housing space 291 of the battery pack frame 200 and the external space ES.

[0056] When the open / close cover 120 is in the open position, opening / closing the cover 120 opens the channel 111 of the base plate 110 to the external space ES, allowing the channel 111 of the base plate 110 to communicate with the external space ES. When the open / close cover 120 is in the open position, gas can flow from the housing space 291 of the battery pack frame 200 to the external space ES through the channel 111 of the base plate 110.

[0057] The cover 140 can be fixed to the base plate 110. The cover 140 can contact one end of the spring 130 and support one end of the spring 130. The cover 140 may include a support portion supporting one end of the spring 130, and a connecting portion extending between the support portion and the base plate 110. The support portion of the cover 140 may include a protrusion supporting the spring 130. The connecting portion of the cover 140 can be fastened to the base plate 110 via bolts 150. By fastening the connecting portion of the cover 140 to the base plate 110 via bolts 150, the cover 140 can be fixed to the base plate 110.

[0058] Spring 130 can provide elasticity to open / close cover 120 in a direction from the open position to the closed position. For example, spring 130 can be configured to compress open / close cover 120 in a direction from the outer wall 263 to the inner wall 261. Spring 130 can be disposed between cover body 140 and open / close cover 120. Cover body 140 can support one end of spring 130, and open / close cover 120 can support the other end of spring 130. In an exemplary embodiment, spring 130 can be a helical spring. Spring 130 can be mounted to cover body 140 such that a portion of it is wound around protrusion 141 of cover body 140.

[0059] like Figure 4 As shown, when the pressure in the housing space 291 of the battery pack frame 200 is below a predetermined threshold, the open / close cover 120 can press against the spring 130 and lock in the closed position. When the open / close cover 120 is in the closed position, the components of the venting device 100 (such as the open / close cover 120 and the spring 130) do not penetrate the housing space 291 of the battery pack frame 200.

[0060] like Figure 5 As shown, when the pressure in the housing space 291 of the battery pack frame 200 exceeds a predetermined threshold, the open / close cover 120 can gradually move from the closed position to the open position or from the inner wall 261 to the outer wall 263. When the open / close cover 120 is in the open position, exhaust gas (VG) can be discharged into the external space (ES) through the channel 111 of the base plate 110, the gap between the open / close cover 120 and the base plate 110, the channel between the inner wall 261 and the outer wall 263, and the through hole 2631 in the outer wall 263.

[0061] The battery pack frame 200 may include fastening bolts 320 for securing the venting device 100. The fastening bolts 320 may be attached to the inner wall 261 of the battery pack frame 200 and may include a protrusion projecting from the inner wall 261 of the battery pack frame 200 in a direction facing the outer wall 263. The fastening bolts 320 may be riveted bolts that are self-riveted to the inner wall 261 of the battery pack frame 200. The protrusion of the fastening bolts 320 may be inserted into fastening holes in the base plate 110. Figure 6a In section 113), the battery pack 10 may further include a nut 330 fitted onto the protrusion of the fastening bolt 320. The inner circumferential surface of the nut 330 may be threaded, which engages with a thread on the outer circumferential surface of the protrusion of the fastening bolt 320. The base plate 110 of the venting device 100 may be secured to the inner wall 261 of the battery pack frame 200 by the engagement of the nut 330 with the protrusion of the fastening bolt 320.

[0062] In the case of the battery pack according to the comparative example, a portion of the valve structure mounted on the battery pack frame is configured to penetrate the receiving space of the battery pack frame. In this case, the space occupied by the valve structure in the receiving space of the battery pack frame prevents the battery cells from being installed there, resulting in poor space utilization of the battery pack. Furthermore, in order to minimize the space occupied by the valve structure in the receiving space of the battery pack frame, there are restrictions on the installation location and number of valve structures.

[0063] According to an exemplary embodiment of this disclosure, the venting device 100 is mounted to the battery pack frame 200 so as not to occupy the housing space 291 of the battery pack frame 200 for housing battery cells, which can improve the space utilization and energy density of the battery pack 10.

[0064] According to an exemplary embodiment of this disclosure, the venting device 100 is mounted to the battery pack frame 200 such that it does not occupy the receiving space 291 of the battery pack frame 200, so that the venting device 100 can be mounted on different parts of the battery pack frame 200 without being limited by the installation position and number of valve structures.

[0065] (Second Implementation)

[0066] Figure 6a and Figure 6b This is a cross-sectional view illustrating a method of manufacturing a battery pack 10 according to an exemplary embodiment of the present disclosure.

[0067] Reference Figure 6aThe fastening bolt 320 is connected to the inner wall 261 of the battery pack frame 200. The fastening bolt 320 can be connected to the inner wall 261 of the battery pack frame 200 by self-riveting. The fastening bolt 320 may have a protrusion that protrudes from the inner wall 261 in a direction away from the inner wall 261 toward the outer wall 263.

[0068] Reference Figure 6b and Figure 4 The venting device 100 is assembled to the battery pack frame 200. Assembling the venting device 100 to the battery pack frame 200 includes introducing the venting device 100 into the venting channel 265 of the battery pack frame 200 through the through hole 2631 of the outer wall 263, adjusting the position of the venting device 100 so that the fastening hole 113 in the base plate 110 of the venting device 100 is inserted into the protrusion of the fastening bolt 320, and fixing the base plate 110 of the venting device 100 to the inner wall 261 of the battery pack frame 200 by tightening the nut 330 onto the protrusion of the fastening bolt 320.

[0069] According to an exemplary embodiment of this disclosure, the assembly of the venting device 100 to the battery pack frame 200 can be performed outside the battery pack frame 200. In this case, it is not necessary to reserve space for assembling the venting device 100 in the receiving space 291 of the battery pack frame 200, and the assembly operation of the venting device 100 can be performed with the battery pack cover 310 attached to the battery pack frame 200. Because the assembly of the venting device 100 can be performed with the battery pack cover 310 attached to the battery pack frame 200, the assembly of the venting device 100 can be performed during the end-of-production testing phase.

[0070] The present disclosure has been described in more detail above with reference to the accompanying drawings and embodiments. However, it should be understood that the configurations shown in the drawings or the embodiments described herein are merely one embodiment of the present disclosure and do not represent all the technical concepts of the present disclosure. Various equivalents and modifications may exist that can replace them at the time of submission of this disclosure.

Claims

1. A battery pack comprising: a battery pack frame having an accommodation space; a battery cell assembly accommodated in the accommodation space of the battery pack frame and including a battery cell; and an exhaust device mounted on the battery pack frame and configured to open and close an internal passage in response to a pressure in the accommodation space of the battery pack frame, wherein the exhaust device is entirely accommodated in an exhaust passage of the battery pack frame, the exhaust passage being provided between an inner wall and an outer wall of the battery pack frame. 2.The battery pack of claim 1, wherein the exhaust device includes: a bottom plate mounted to the inner wall of the battery pack frame and having a passage communicating with a through-hole in the inner wall of the battery pack frame; an open / close cover configured to open and close the passage of the bottom plate; a spring providing elasticity to the open / close cover to cause the open / close cover to close the passage in the bottom plate; and a cover body fixed to the bottom plate and supporting the spring. 3.The battery pack of claim 2, wherein the open / close cover is configured to move between a closed position in which the passage of the bottom plate is closed and an open position in which the passage of the bottom plate is opened, wherein the closed position of the open / close cover is closer to the inner wall than the open position of the open / close cover, wherein the spring is configured to press the open / close cover in a direction from the outer wall toward the inner wall. 4.The battery pack of claim 3, wherein when the open / close cover is in the closed position, the spring does not penetrate into the accommodation space of the battery pack frame. 5.The battery pack of claim 2, wherein one end of the spring contacts the cover body, and the other end of the spring contacts the open / close cover. 6.The battery pack of claim 2, wherein the cover body includes a protrusion supporting the spring. 7.The battery pack of claim 2, further comprising: a fastening bolt coupled to the inner wall of the battery pack frame and including a protrusion protruding from the inner wall of the battery pack frame in a direction from the inner wall of the battery pack frame toward an outer wall of the battery pack frame; and a nut threadedly coupled to the protrusion of the fastening bolt, wherein the bottom plate includes a fastening hole into which the protrusion of the fastening bolt is inserted, and the bottom plate is fixed to the inner wall of the battery pack frame by fitting the nut into the protrusion of the fastening bolt. 8.The battery pack of claim 7, wherein the bottom plate is pressed against a surface of the inner wall of the battery pack frame facing the outer wall of the battery pack frame. 9.The battery pack of claim 1, wherein ​ ​ ​ The outer wall of the battery pack frame includes a through-hole that communicates the exhaust passage of the battery pack frame with an external space outside the battery pack frame.

10. The battery pack of claim 9, wherein The exhaust device is exposed to the outside through the through-hole in the outer wall of the battery pack frame.

11. The battery pack of claim 1, wherein The battery pack frame includes a bottom frame that supports the battery cell assembly and a side frame on the bottom frame, wherein The exhaust device is mounted on the side frame.

12. The battery pack of claim 11, further comprising: a battery pack cover coupled to the side frame to cover the battery cell assembly housed in the battery pack frame.

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