Battery packs and devices containing them

Abstract

The present invention relates to a battery pack and a device including the same. A battery pack according to an embodiment of the present invention can include a plurality of battery modules, a flow path frame disposed along at least a part of the periphery of the plurality of battery modules to form an internal passage, and a blower member communicating with one end of the internal passage of the flow path frame to control the gas discharge rate in the internal passage.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0087178 filed on July 14, 2022, and all the contents disclosed in the document of the Korean patent application are incorporated herein by reference as part of this specification.

[0002] The present invention relates to a battery pack and a device including the same, and more particularly, to a battery pack capable of smoothly discharging high-temperature gas and a device including the same.

Background Art

[0003] Recently, with the rapid increase in the demand for portable electronic products such as notebook computers, video cameras, and mobile phones, and the full-scale development of electric vehicles, energy storage batteries, robots, satellites, etc., various studies have been conducted on secondary batteries used as their driving power sources.

[0004] As the need for the structure of large-capacity secondary batteries increases, the need for battery packs with a multi-module structure that combines battery modules connected with a large number of secondary batteries is increasing.

[0005] When a battery cell included in a battery pack catches fire, high-temperature gas and flames can be generated. If the high-temperature gas and flames are not smoothly discharged, the internal pressure of the battery pack may increase, and the pack structure may collapse.

Summary of the Invention

Problems to be Solved by the Invention

[0006] An embodiment of the present invention aims to provide a battery pack capable of smoothly discharging gas generated inside and a device including the same.

[0007] The technical problems of the present invention are not limited to those mentioned above, and other technical problems not mentioned can be clearly understood by an ordinary person of the art from the following description. [Means for solving the problem]

[0008] A battery pack according to one embodiment of the present invention may include a plurality of battery modules, a flow path frame arranged along the periphery of at least some of the plurality of battery modules and forming an internal passage, and a blower member that communicates with one end of the internal passage of the flow path frame and controls the gas discharge rate in the internal passage.

[0009] According to one embodiment, the battery pack may further include an outlet that communicates with the other end of the internal passage.

[0010] According to one embodiment, the battery pack further comprises a pack housing that accommodates the battery module and the flow path frame, a storage tank disposed either inside or outside the pack housing, and a fluid supply pipe disposed between the storage tank and the flow path frame, wherein the fluid stored in the storage tank can be supplied to the internal passage of the flow path frame via the fluid supply pipe.

[0011] According to one embodiment, the fluid can be at least one of a liquid containing water and a gas containing nitrogen.

[0012] According to one embodiment, the blower member operates when the pressure in the internal passage is a first pressure, and the storage tank can operate after the blower member has operated when the pressure in the internal passage is the first pressure or a second pressure higher than the first pressure.

[0013] According to one embodiment, the storage tank can discharge the fluid at a third pressure higher than the second pressure.

[0014] According to one embodiment, the fluid supply pipe can be formed by branching off from the fluid frame.

[0015] According to one embodiment, the storage tanks are provided in multiple quantities, one of which stores a foreign matter discharge gas that is injected into the internal passage, and one of the remaining storage tanks can store a foreign matter discharge liquid that is injected into the internal passage.

[0016] According to one embodiment, the flow path frame may include a first flow path frame arranged along one side periphery of the plurality of battery modules and a second flow path frame arranged along the other side periphery of the plurality of battery modules.

[0017] According to one embodiment, the blowing member may include a rotating fan.

[0018] A device according to one embodiment of the present invention may include the battery pack described above. [Effects of the Invention]

[0019] According to embodiments of the present invention, gas generated inside the battery pack can be smoothly discharged via a blower member placed inside the battery pack, thereby suppressing the generation of flames and the rise in pressure inside the battery pack.

[0020] According to embodiments of the present invention, foreign matter accumulating inside the battery pack can be discharged to the outside via a fluid injected into the battery pack, and the pressure inside the battery pack can be controlled to a predetermined level.

[0021] According to embodiments of the present invention, when an abnormal phenomenon occurs in a battery cell, the stability of the battery pack can be improved by at least one of a blower member placed inside the battery pack and a fluid injected into the battery pack.

[0022] In addition, various effects that can be directly or indirectly grasped by this document can be provided.

Brief Description of the Drawings

[0023] [Figure 1] It is a perspective view showing a battery pack according to the first embodiment of the present invention. [Figure 2] It is an exploded perspective view of the battery module shown in FIG. 1. [Figure 3] It is a cross-sectional view for specifically explaining the flow path frame shown in FIG. 1. [Figure 4a] It is a diagram for explaining a gas discharge method of a battery pack according to an embodiment of the present invention using the flow path frame shown in FIG. 3. [Figure 4b] It is a diagram for explaining a gas discharge method of a battery pack according to an embodiment of the present invention using the flow path frame shown in FIG. 3. [Figure 5] It is a cross-sectional view showing a part of a battery pack according to the second embodiment of the present invention. [Figure 6a] It is a diagram for explaining a gas discharge method of a battery pack according to another embodiment of the present invention using the flow path frame shown in FIG. 5. [Figure 6b] It is a diagram for explaining a gas discharge method of a battery pack according to another embodiment of the present invention using the flow path frame shown in FIG. 5.

Modes for Carrying Out the Invention

[0024] Hereinafter, referring 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.

[0025] For the purpose of clearly describing the present invention, detailed descriptions of relevant prior art that are irrelevant to the description or that could obscure the gist of the invention have been omitted. In this specification, when assigning reference numerals to components in the drawings, the same or similar reference numerals are used for components that are the same or similar throughout the specification.

[0026] Furthermore, the terms and words used in this specification and the claims should not be interpreted in a manner limited to their ordinary or dictionary meanings, but rather should be interpreted in a manner consistent with the technical idea of ​​the present invention, in accordance with the principle that inventors may appropriately define the concepts of terms in order to best describe their invention.

[0027] First Embodiment Figure 1 is an exploded perspective view showing a battery pack according to a first embodiment of the present invention, and Figure 2 is an exploded perspective view showing the battery module shown in Figure 1 in detail.

[0028] Referring to Figure 1, the battery pack 101 according to the first embodiment of the present invention may include a pack housing 400 and a plurality of battery modules 100 and a flow path frame 300 housed in the pack housing 400.

[0029] Each of the multiple battery modules 100 may include a battery cell stack 102 in which multiple battery cells 103 are stacked, a module frame 110 that houses the battery cell stack 102, and an end plate 120, as illustrated in Figure 2.

[0030] Multiple battery cells 103 are stacked so as to be electrically connected to each other to form a battery cell stack 102. For example, multiple battery cells 103 can be stacked along a direction parallel to the y-axis, as shown in Figure 2.

[0031] The module frame 110 housing the battery cell stack 102 may include an upper plate 112 and a lower frame 111. The lower frame 111 may be U-shaped. The U-shaped lower frame 111 may include a bottom and two side portions extending in the z-axis direction from both ends of the bottom. The bottom can cover the bottom surface (opposite direction of the z-axis) of the battery cell stack 102, and the side portions can cover both sides of the battery cell stack 102 (in the y-axis direction and the opposite direction).

[0032] The upper plate 112 can be formed as a single plate-like structure that encloses the remaining upper surface (in the z-axis direction) except for the bottom surface and both sides that are enclosed by the lower frame 111. The upper plate 112 and the lower frame 111 can be joined by welding or other means, with their corresponding corner portions in contact, to form a structure that covers the battery cell stack 102 from all sides. The upper plate 112 and the lower frame 111 can physically protect the battery cell stack 102. The upper plate 112 and the lower frame 111 can be made of a metal material having a predetermined strength.

[0033] The end plates 120 can cover the battery cell stacks 102 exposed at both ends of the module frame 110. A venting gate 121 can be formed on at least one of the end plates 120. The venting gate 121 can communicate with the interior of the battery module 100 and release any flames or heat that may be generated inside the battery module 100. The venting gate 121 can communicate with the interior of the battery module 100 by being connected to an opening (not shown) formed in a part of the end plate 120. The venting gate 121 can be positioned to face outwards from the battery pack 101.

[0034] Multiple battery modules 100 can be arranged in a single row or in a matrix configuration. For example, some of the battery modules 100 arranged in a matrix configuration can be arranged in a first row parallel to the y-axis direction, and the remaining portion of the battery modules 100 can be arranged in a second row parallel to the first row. The battery modules 100 arranged in the first row and the battery modules 100 arranged in the second row can be arranged symmetrically with respect to the y-axis direction. The venting gates 121 of each battery module 100 arranged in the first row can be positioned to face in opposite directions along the x-axis direction. The venting gates 121 of each battery module 100 arranged in the second row can be positioned to face along the x-axis direction.

[0035] The flow path frame 300 can be formed along the periphery of at least some of the multiple battery modules 100. The flow path frame 300 can be formed along at least one of the multiple sides of the lower housing 410. The flow path frame 300 can be formed in a tubular shape between the lower housing 410 and the battery modules 100. At least one flow path frame 300 can be provided between the lower housing 410 and the battery modules 100. For example, if the multiple battery modules 100 arranged in a matrix configuration are arranged in two rows, the flow path frame 300 can include a first flow path frame 310 and a second flow path frame 320 arranged in parallel. The first flow path frame 310 can be formed in a form that extends along the end plates 120 of the multiple battery modules 100 arranged in the first row. The second flow path frame 320 can be formed in a form that extends along the end plates 120 of the multiple battery modules 100 arranged in the second row. The internal passages of the first flow channel frame 310 and the internal passages of the second flow channel frame 320 can be formed to communicate with each other or to be formed to be separated from each other.

[0036] The pack housing 400 may include a lower housing 410 and an upper cover 420.

[0037] The upper cover 420 connects with the lower housing 410 so as to cover the top of the battery module 100, thereby protecting the entire length inside the pack housing 400.

[0038] The lower housing 410 may include a bottom surface and side walls extending in the z-axis direction from the edge of the bottom surface. A pack tray 200 can be placed on the bottom surface. The lower housing 410 can house a battery module 100, a flow path frame 300, a blower member 500, and a pack tray 200. Multiple battery modules 100, flow path frames 300, and blower members 500 can be arranged on the pack tray 200. Multiple battery modules 100 and flow path frames 300 can be fixed to the pack tray 200 as needed.

[0039] The blower member 500 can discharge air into the internal passage of the flow path frame 300 via the outlet 430. The blower member 500 may be a blower fan (or rotary fan) with multiple blades positioned to rotate around an axis, or it may be a blower member without blades.

[0040] The blower member 500 can be activated when at least one of the gas flow velocity, gas volume, and pressure inside the flow path frame 300 reaches a predetermined level (reference value). The operation (or rotation) of the blower member 500 causes the gas inside the flow path frame 300 to be discharged to the outside at a speed exceeding the performance of the venting member, thereby suppressing the rise in temperature and pressure inside the battery pack 101. The venting member may include at least one of the venting gate 121, outlet 430, venting valve, and rupture disc.

[0041] An outlet 430 can be provided on one side wall of the lower housing 410 to discharge heat or flames generated inside to the outside. At least one of a venting valve and a rupture disc, which are part of the venting member, can be provided around the outlet 430. The rupture disc can be connected to the flow path frame 300. The rupture disc can be formed to rupture when the pressure of the gas flowing into the internal passage of the flow path frame 300 exceeds a predetermined pressure.

[0042] Inside the pack housing 400, which includes the lower housing 410 and the upper cover 420, various control and protection systems such as a Battery Management System (BMS) and a cooling system can be installed along with the battery module 100. The Battery Management System can monitor at least one of the pressure, temperature, and gas of at least one of the battery module 100 and the flow path frame 300. The Battery Management System can control whether the blower member 500 operates by comparing the monitored measurement value with a preset reference value. The Battery Management System can control the blower member 500 to operate if the monitored measurement value reaches the preset reference value. The Battery Management System can control the blower member 500 not to operate if the monitored measurement value is below the preset reference value.

[0043] As an example, the battery management system can compare the measured pressure with a preset reference pressure and control the blower 500 to operate when the measured pressure reaches the reference pressure. As another example, the battery management system can compare the measured amount of gas with a preset reference amount of gas and control the blower 500 to operate when the measured amount of gas reaches the reference amount of gas. As yet another example, the battery management system can control the blower 500 to operate when at least two of the measured values ​​of pressure, temperature, and gas reach preset reference values.

[0044] Figure 3 is a diagram that provides a detailed explanation of the flow path frame shown in Figure 1. Although two flow path frames are illustrated in Figure 3, the diagram is not limited to these, and their positions and number can be appropriately selected as needed.

[0045] Referring to Figure 3, the flow channel frame 300 according to the first embodiment of the present invention can communicate with the venting gate 121 and the outlet 430 of the battery module 100. When thermal runaway occurs in the battery module 100, the flow channel frame 300 can guide the heat and flames outward, minimizing the impact on surrounding battery modules. Here, the flames contained in the high-pressure venting gas generated can burn completely as they pass through the internal passages of the flow channel frame 300 and be discharged to the outside in a safer state. Furthermore, the flow channel frame 300 can act as a support frame that stably supports the battery module 100, thereby improving the stability of the battery pack 101.

[0046] Such a flow channel frame 300 may include a first flow channel frame 310 and a second flow channel frame 320. The first flow channel frame 310 can communicate with the venting gates 121 of each of the multiple battery modules 100 arranged in the first row of the multiple battery modules 100. The second flow channel frame 320 can communicate with the venting gates 121 of each of the multiple battery modules 100 arranged in the second row of the multiple battery modules 100.

[0047] A blower member 500 can be positioned on at least one side of the first flow path frame 310 and the second flow path frame 320 (e.g., the side facing the opposite direction of the y-axis). An outlet 430 can be positioned on the other side of at least one of the first flow path frame 310 and the second flow path frame 320 (e.g., the side facing the y-axis).

[0048] The air blower member 500 can be positioned in the internal passages of each flow path frame 310, 320, or between each of the flow path frames 310, 320 and the lower housing 410. The air blower member 500 can be positioned adjacent to the battery module 100 that is furthest from the venting member among the multiple battery modules 100. The air blower member 500 can forcibly expel the air in the internal passages of the flow path frame 300 to the outside through the venting member. Since the air blower member 500 rotates due to the rotation of the motor 510, it can accelerate the flow of gas within the flow path frames 310, 320. As the air blower member 500 rotates, the gas within the flow path frames 310, 320 moves toward the outlet 430 and can be discharged to the outside of the battery pack 101.

[0049] Figures 4a and 4b illustrate a method for discharging gas from a battery pack according to a first embodiment of the present invention.

[0050] As illustrated in Figure 4a, problems such as overvoltage, overcurrent, or overheating (or thermal problems) may occur in at least one of the multiple battery modules 100. In this case, high-pressure venting gas can be discharged from inside the battery module 100 through the venting gate 121. The high-temperature, high-pressure gas and flame released through the venting gate 121 can flow into the internal passages of the flow path frames 310 and 320. The incoming high-temperature, high-pressure gas and flame can be discharged to the outside through a venting member including at least one of the outlet 430, a rupture disc, and a venting valve. The gas flowing into the internal passages of the flow path frames 310 and 320 can be discharged at a first velocity.

[0051] Here, the battery management system can monitor at least one of the internal temperature, pressure, gas volume, and gas flow velocity of the flow path frames 310 and 320 in real time or periodically. The battery management system can control the operation of the blower member 500 when at least one of the internal temperature, pressure, gas volume, and gas flow velocity of the flow path frames 310 and 320 reaches a reference value. The blower member 500 can rotate using power supplied to the motor 510. The rotational motion of the blower member 500 allows the high-pressure gas and flame in the internal passages of the flow path frames 300 to be forcibly discharged to the outside through the outlet 430, as illustrated in Figure 4b. The blower member 500 can discharge the high-pressure gas and flame in the internal passages of the flow path frames 300 to the outside at a second speed. The second speed can be higher than the first speed (performance of the venting member) at which the high-pressure gas and flame in the internal passages of the flow path frames 300 are discharged to the outside through the venting member including the outlet 430. This suppresses the rise in temperature and pressure inside the battery pack 101, thereby preventing deformation and collapse of the battery pack 101's structure.

[0052] Second Embodiment Figure 5 is a cross-sectional view showing a battery pack according to a second embodiment of the present invention. The battery pack shown in Figure 5 may have the same components as the battery pack of the first embodiment shown in Figures 1 and 3, except that it further includes a storage tank 700 and a fluid supply pipe 600. It goes without saying that a detailed description of the same components can be considered as the contents of the battery pack of the first embodiment.

[0053] Referring to Figure 5, the battery pack 501 according to a second embodiment of the present invention may include a storage tank 700 and a fluid supply pipe 600.

[0054] The fluid supply pipe 600 can be formed by branching off from the flow path frame 300. The blower member 500, positioned within the flow path frame 300, can avoid obstructing the flow of fluid injected through the storage tank 700.

[0055] One end of the fluid supply pipe 600 can be connected to a storage tank 700 located either inside or outside the pack housing 400. The other end of the fluid supply pipe 600 can communicate with an internal passage of the flow path frame 300.

[0056] The storage tank 700 can store fluids that can be injected into the internal passages of the flow path frame 300. The fluids can be periodically filled and stored in the storage tank 700. The storage tank 700 may store at least one of the following fluids: a gas for foreign matter discharge and a liquid for foreign matter discharge. For example, the gas for foreign matter discharge may include nitrogen, and the liquid for foreign matter discharge may include water.

[0057] The storage tank 700 may include multiple storage tanks, each storing different or the same fluid. For example, the storage tank 700 may include a first storage tank storing a gas containing nitrogen and a second storage tank storing a liquid containing water. Fluid can be supplied into the fluid supply pipe 600 and the flow path frame 300 in the order of the first and second storage tanks, or in reverse order. A pump (not shown) connected to the storage tank 700 pumps the fluid in the storage tank 700, thereby allowing the fluid stored in the storage tank 700 to be injected into the fluid supply pipe 600.

[0058] The storage tank 700 can remove foreign matter accumulated inside the flow channel frame 300 and at the outlet 430 by injecting fluid at high pressure into the fluid supply pipe 600 and the flow channel frame 300 toward the outlet 430. Foreign matter can be generated by carbonization when the battery cell 103 ignites, or by the melting of at least one of the venting member and the blower member 500, including the outlet 430. As a result, the foreign matter can be smoothly discharged to the outside of the battery pack 101 via the fluid injected at high pressure.

[0059] For example, the storage tank 700 can inject fluid into the flow path frame 300 via the fluid supply pipe 600 if the temperature and pressure inside the flow path frame 300 rise despite the operation of the blower member 500. The storage tank 700 can inject fluid into the flow path frame 300 if, despite the operation of the blower member 500, at least one of the temperature and pressure of the internal passages of the flow path frame 300 reaches a preset reference value. Specifically, the operation of the blower member 500 can cause the amount of gas generated from at least one of the multiple battery modules 100 to exceed the amount of gas discharged to the outside. In this case, the temperature and pressure inside the flow path frame 300 and the battery modules 100 may rise. If a flame is generated and propagates due to the rise in temperature and pressure, foreign matter generated by carbonizing or melting the internal structures of the battery pack may accumulate in the internal passages of the flow path frame 300 and the outlet 430. Foreign matter can block the internal passages and outlets 430 of the flow path frame 300, reducing the amount of gas discharged through the flow path frame 300 and potentially accelerating the rise in pressure and temperature inside the battery pack 101. Therefore, the fluid injected at high pressure by the storage tank 700 can discharge the foreign matter accumulated in the internal passages and outlets 430 of the flow path frame 300 to the outside of the battery pack 101.

[0060] As another example, if the temperature and pressure inside the flow path frame 300 are below a reference value after the operation of the blower member 500 is complete, the storage tank 700 can inject fluid into the flow path frame 300 via the fluid supply pipe 600. This allows foreign matter accumulated inside the flow path frame 300 and at the outlet 430 to be smoothly discharged to the outside of the battery pack 101, and the pressure inside the battery pack 101 can be maintained at a predetermined level.

[0061] As yet another example, without the operation of the blower member 500, after the gas has been discharged through the vent gate 121, the flow path frame, and the outlet, the storage tank 700 can inject fluid into the flow path frame 300 via the fluid supply pipe 600. This allows any foreign matter accumulated inside the flow path frame 300 and at the outlet 430 to be smoothly discharged to the outside of the battery pack 101, and the inside of the battery pack 101 can maintain a predetermined pressure level.

[0062] Figures 6a and 6b illustrate a method for discharging gas from a battery pack according to a second embodiment of the present invention.

[0063] As illustrated in Figure 6a, problems such as overvoltage, overcurrent, or overheating (thermal problems) may occur in at least one of the multiple battery modules 100. In this case, venting gas can be discharged from inside the battery module 100 through the venting gate 121. The high-temperature, high-pressure venting gas and flame released through the venting gate 121 can flow into the flow path frames 310 and 320. The incoming high-temperature, high-pressure venting gas and flame can be discharged to the outside at a first velocity through the venting member including the outlet 430.

[0064] Here, the battery management system can monitor at least one of the following in real time or periodically: temperature, pressure, gas volume, and gas flow velocity inside the flow path frames 310 and 320. When at least one of the following in the flow path frames 310 and 320 reaches a reference value, the battery management system can control the operation of the blower member 500. For example, the battery management system can control the operation of the blower member 500 when the pressure in the internal passages of the flow path frames 310 and 320 rises to a first pressure. The blower member 500 can be rotated by the power supplied to the motor 510. The rotational motion of the blower member 500 allows the high-pressure gas and flame inside the flow path frame 300 to be forcibly discharged to the outside through the outlet 430. The blower member 500 can discharge the high-pressure venting gas and flame inside the flow path frame 300 to the outside at a second speed. The second velocity can be higher than the first velocity (or the performance of the venting member) that causes the high-pressure venting gas and flame inside the flow path frame 300 to be discharged to the outside through the venting member.

[0065] Despite the operation of the blower member 500, if at least one of the temperature, pressure, gas volume, and gas velocity in the internal passages of the flow path frames 310 and 320 reaches a reference value, the storage tank 700 can inject fluid into the flow path frame 300, as illustrated in Figure 6b. For example, the storage tank 700 can inject fluid into the flow path frame 300 if the pressure in the internal passages of the flow path frames 310 and 320 reaches a first pressure or a second pressure higher than the first pressure. The storage tank 700 can inject fluid at a third pressure higher than the second pressure.

[0066] The fluid injected at high pressure (e.g., third pressure) from the storage tank 700 can discharge foreign matter accumulated in the internal passages of the flow path frame 300 and the outlet 430 to the outside of the battery pack 101. This allows the inside of the battery pack 101 to maintain a predetermined temperature and pressure.

[0067] The structure of the battery pack 101 described above is not limited to the embodiments described in each drawing, and the structures described in each drawing can be applied in combination with each other. For example, the battery pack 101 can employ multiple blower members 500 as described in Figures 3, 4a, and 4b, or multiple storage tanks 700 and fluid supply pipes 600 without the blower members 500 as described in Figures 5, 6a, and 6b, or a combination of blower members 500, storage tanks 700 and fluid supply pipes 600 as described in Figures 5, 6a, and 6b.

[0068] Furthermore, the aforementioned battery pack 101 can be applied to a variety of devices. It can be applied to means of transportation such as electric bicycles, electric vehicles, and hybrids, but is not limited to these; it can be applied to any device that can use the battery pack 101.

[0069] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible by persons with ordinary skill in the art to which the present invention pertains, within the equivalent scope of the technical concept of the present invention and the claims described below. [Explanation of symbols]

[0070] 101 Battery Pack 100 Battery Modules 120 End Plate 121 Venting Gate 430 Outlet 500 Air blower component 510 Motor 300, 310, 320 flow path frames 600 Fluid supply pipe 700 storage tanks

Claims

1. Multiple battery modules, A flow path frame is arranged along the periphery of at least some of the battery modules and forms an internal passage, The system includes a blower member that communicates with one end of the internal passage of the flow path frame and controls the gas discharge rate within the internal passage, A pack housing that accommodates the battery module and the flow path frame, A storage tank is located either inside or outside the pack housing, The system further comprises a fluid supply pipe positioned between the storage tank and the flow path frame, A battery pack in which the fluid stored in the storage tank is supplied to the internal passages of the flow path frame via the fluid supply pipe for the purpose of discharging foreign matter from the internal passages of the flow path frame.

2. The battery pack according to claim 1, further comprising an outlet communicating with the other end of the internal passage.

3. The battery pack according to claim 1, wherein the fluid is at least one of a liquid containing water and a gas containing nitrogen.

4. The blowing member operates when the pressure in the internal passage is a first pressure. The battery pack according to claim 1, wherein the storage tank operates after the operation of the blower member when the pressure in the internal passage is the first pressure or a second pressure higher than the first pressure.

5. The battery pack according to claim 4, wherein the storage tank discharges the fluid at a third pressure higher than the second pressure.

6. The battery pack according to claim 1, wherein the fluid supply pipe is formed by branching off from the flow path frame.

7. Multiple storage tanks are provided, Any one of the aforementioned storage tanks stores the foreign matter discharge gas that is injected into the internal passage, The battery pack according to claim 1, wherein one of the remaining storage tanks stores a foreign matter discharge liquid that is injected into the internal passage.

8. The flow path frame includes a first flow path frame arranged along one side of the periphery of the plurality of battery modules, The battery pack according to claim 1, further comprising a second flow channel frame arranged along the other periphery of the plurality of battery modules.

9. The battery pack according to claim 1, wherein the blowing member includes a rotating fan.

10. A device comprising the battery pack described in claim 1.

Images