Vehicle device including battery pack

Abstract

A vehicle device according to one embodiment of the present invention comprises a battery pack and a tank. The battery pack includes: a plurality of battery cells; a pack frame on which the battery cells are directly mounted or on which the battery cells are mounted while accommodated in a module frame; and a pack cover for covering the pack frame. The tank includes: cooling water or fire-extinguishing water; a tank outlet from which the cooling water or fire-extinguishing water is discharged; and a sealing layer provided at one side on which the tank outlet is arranged.

Description

Vehicle device including battery pack

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0021604, filed February 15, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a vehicle device including a battery pack, and more specifically, to a vehicle device capable of preventing ignition of a battery pack surface by lowering the temperature of the battery pack surface.

[0004] In modern society, the widespread use of portable devices like cell phones, laptops, camcorders, and digital cameras has fueled active development of technologies related to these devices. Furthermore, rechargeable secondary batteries are increasingly being used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) to address air pollution caused by conventional gasoline-powered vehicles, further fueling the growing need for secondary battery development.

[0005] Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving attention for their advantages of being able to charge and discharge freely, having a very low self-discharge rate, and having a high energy density, as they have almost no memory effect compared to nickel-based secondary batteries.

[0006] These lithium secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. The lithium secondary battery comprises an electrode assembly comprising a positive electrode plate and a negative electrode plate, each coated with the positive and negative electrode active materials, with a separator interposed between them, and a battery case that seals and houses the electrode assembly together with an electrolyte.

[0007] In general, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode assembly is built into a metal can and pouch-type secondary batteries in which the electrode assembly is built into a pouch of an aluminum laminate sheet, depending on the shape of the outer packaging material.

[0008] Secondary batteries used in small devices are configured with 2-3 battery cells, but secondary batteries used in medium- to large-sized devices such as automobiles utilize battery modules in which multiple battery cells are electrically connected. These battery modules enhance capacity and output by forming a battery cell stack by connecting multiple battery cells in series or parallel. In addition, one or more battery modules may be mounted together with various control and protection systems, such as a Battery Disconnect Unit (BDU), a Battery Management System (BMS), and a cooling system, to form a battery pack.

[0009] A battery pack may include battery modules as a sub-concept, and a battery module may include battery cells as a sub-concept. The number of battery cells contained in a battery module or the number of battery modules contained in a battery pack may vary depending on the output or capacity of the battery pack required for the electric vehicle.

[0010] However, for these battery packs, one of the most critical issues is safety. Specifically, if a thermal event occurs in at least one of the multiple battery cells contained within the pack, high-temperature gas and heat are generated.

[0011] Figure 1 is a cross-sectional view showing a conventional battery pack and a conventional chassis inside a vehicle device.

[0012] Referring to Fig. 1, when thermal runaway occurs, high-temperature venting gas is discharged from the side of a conventional battery pack (1). Due to the thermal runaway inside the conventional battery pack (1), the temperature of the surface of the conventional battery pack (1) rises. The high-temperature venting gas flows from inside the conventional chassis (10) to the surface of the conventional battery pack (1). At this time, the high-temperature venting gas ignites on the surface of the conventional battery pack (1). Since such ignition may lead to an explosion of the battery pack (1) and a vehicle device including the same, it is necessary to lower the temperature of the surface of the battery pack to prevent such ignition on the surface of the battery pack.

[0013] The problem to be solved by the present invention is to prevent ignition of the surface of a battery pack when thermal runaway occurs, and more specifically, to provide a vehicle device capable of preventing ignition of the surface of a battery pack by lowering the temperature of the surface of the battery pack.

[0014] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0015] A vehicle device according to one embodiment of the present invention includes a battery pack; and a tank. The battery pack includes a plurality of battery cells; a pack frame in which the battery cells are directly mounted or mounted in a state in which the battery cells are accommodated in a module frame; and a pack cover covering the pack frame. The tank includes cooling water or fire extinguishing water; a tank discharge port through which the cooling water or fire extinguishing water is discharged; and a sealing layer provided on one side where the tank discharge port is disposed.

[0016] The above sealing layer may melt or rupture at high temperatures, causing the cooling water or extinguishing water to be discharged.

[0017] The above tank discharge port may be provided toward the upper part of the pack cover.

[0018] The above battery pack may be provided with a valve for discharging internal gas.

[0019] The tank may be secured to the chassis between the pack cover and the chassis inside the vehicle device.

[0020] The above battery pack may be provided on the pack cover and may include one or more frame members having cooling water or extinguishing water.

[0021] The above frame member may be a tubular member having a cavity part therein and extending in one direction. The cooling water or the fire extinguishing water may be provided in the cavity part.

[0022] The above frame member may include a TIM pad that contacts the pack cover.

[0023] It may include an adhesive tape positioned between the frame member and the TIM pad.

[0024] The frame member may include one or more frame member valves for discharging cooling water or extinguishing water.

[0025] The above frame member valve may include a frame member outlet facing the pack cover.

[0026] The above frame member may include a mounting portion having a mounting hole formed therein. A mounting bolt may pass through the mounting hole and be fastened to the pack cover.

[0027] The above frame member may include a first hollow portion and a second hollow portion in which the cooling water or the extinguishing water is provided. The mounting portion may be positioned between the first hollow portion and the second hollow portion.

[0028] The above frame member can be welded to the pack cover.

[0029] The above frame member can be fixed to the pack cover between the pack cover and the chassis inside the vehicle device.

[0030] According to embodiments of the present invention, a vehicle device can lower the temperature of the surface of a battery pack by including a tank containing coolant or extinguishing agent. This can prevent ignition of the surface of the battery pack, thereby preventing flames from spreading.

[0031] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0032] Figure 1 is a cross-sectional view showing a conventional battery pack and a conventional chassis inside a vehicle device.

[0033] Figure 2 is an exploded perspective view showing a battery pack according to one embodiment of the present invention.

[0034] Figure 3 is a perspective view showing a battery pack according to one embodiment of the present invention.

[0035] FIG. 4 is a cross-sectional view showing a chassis inside a vehicle device according to one embodiment of the present invention.

[0036] Figure 5 is a partial drawing showing an enlarged portion of “A” of Figure 4.

[0037] Figure 6 is a perspective view showing a battery pack according to another embodiment of the present invention.

[0038] Figure 7 is an exploded perspective view showing a battery pack according to another embodiment of the present invention.

[0039] Figure 8 is a perspective view showing a battery pack according to another embodiment of the present invention.

[0040] Figure 9 is a plan view showing a battery pack according to another embodiment of the present invention.

[0041] Figure 10 is a plan view showing a battery pack according to another embodiment of the present invention.

[0042] Fig. 11 is a cross-sectional view showing a cross-section taken along the cutting line A-A' of Fig. 9.

[0043] Fig. 12 is a cross-sectional view showing a battery pack according to another embodiment of the present invention.

[0044] Fig. 13 is a cross-sectional view showing a battery pack according to another embodiment of the present invention.

[0045] Figure 14 is a partial perspective view showing the outlet of a frame member valve included in a frame member.

[0046] Fig. 15 is a cross-sectional view showing a cross-section taken along the cutting line B-B' of Fig. 9.

[0047] Fig. 16 is a cross-sectional view showing a battery pack according to another embodiment of the present invention.

[0048] Fig. 17 is a cross-sectional view showing a chassis inside a vehicle device according to another embodiment of the present invention.

[0049] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0050] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0051] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0052] Furthermore, when we say that a layer, membrane, region, plate, or other part is "on" or "over" another part, this includes not only cases where it is "directly on" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly on" another part, it means that there are no other parts in between. Furthermore, saying that a part is "on" or "over" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "over" the direction opposite to gravity.

[0053] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0054] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0055] Fig. 2 is an exploded perspective view illustrating a battery pack (1000) according to one embodiment of the present invention. Fig. 3 is a perspective view illustrating a battery pack (1000) according to one embodiment of the present invention. Fig. 4 is a cross-sectional view illustrating a chassis (10000) inside a vehicle device according to one embodiment of the present invention. Specifically, Fig. 4 illustrates a chassis (10000), a tank (1300), and a battery pack (1000).

[0056] Referring to FIGS. 2 to 4, a vehicle device according to an embodiment of the present invention includes a battery pack (1000); and a tank (1300). The battery pack (1000) includes a plurality of battery cells (100); a pack frame (1100) in which the battery cells (100) are directly mounted or mounted in a state in which the battery cells (100) are accommodated in a module frame; and a pack cover (1200) covering the pack frame (1100). The tank (1300) includes a tank outlet (1300a) through which cooling water or fire extinguishing water is discharged; and a sealing layer (1300b) provided on one side where the tank outlet (1300a) is disposed.

[0057] According to embodiments of the present invention, when ignition occurs within the battery pack (1000), heat or gas generated within the battery pack (1000) may melt the sealing layer (1300b). That is, as the sealing layer (1300b) surrounding the tank outlet (1300a) melts, the tank outlet (1300a) may be opened. As the tank outlet (1300a) is opened, the cooling water or fire extinguishing water within the tank (1300) may be discharged. The discharged cooling water or fire extinguishing water may be sprayed onto the surface of the battery pack (1000) to lower the temperature of the surface of the battery pack (1000). This may prevent ignition of the surface of the battery pack (1000), thereby preventing flames from leaking out and explosions from occurring.

[0058] The size of the tank (1300) can be determined according to the capacity, shape, size, etc. of the battery pack (1000). The size of the tank (1300) can cover the entire cross-sectional area (xy plane of FIG. 2) of the battery pack (1000).

[0059] The location and dimensions of the tank discharge port (1300a) can be determined according to the shape, size, etc. of the battery pack (1000).

[0060] The sealing layer (1300b) may be applied to the entire outer surface of the tank (1300), or may be applied only to the area corresponding to the tank outlet (1300a). The material and function of the sealing layer (1300b) will be described later.

[0061] Coolant or extinguishing water may be one of the known ones or a mixture thereof, and any of the known ones may be used as long as it is capable of releasing heat from the battery pack (1000) by being held in the tank (1300).

[0062] The tank (1300) may include an opening (not shown) for injecting or discharging coolant or extinguishing water. A user of the vehicle device or the like may inject or discharge coolant or extinguishing water into the tank (1300) through the opening, depending on the remaining amount of coolant or extinguishing water in the tank (1300).

[0063] The tank (1300) may be equipped with a water level sensor (not shown) capable of checking the remaining amount of cooling water or fire extinguishing water contained in the tank (1300). The vehicle device may be equipped with a water level display unit (not shown) that receives data on the level of cooling water or fire extinguishing water from the water level sensor and displays the water level. Through the water level display unit, the user of the vehicle device can check the level of cooling water or fire extinguishing water.

[0064] Additionally, the vehicle device may be equipped with a water level warning display unit that can notify the user of the vehicle device when the level of the coolant or extinguishing water contained in the tank (1300) exceeds or falls below a preset level. If a warning is displayed on the water level warning display unit, the user of the vehicle device can immediately take action, such as repairing the vehicle device.

[0065] In addition, the user of the vehicle device can easily check whether there is a leak or leakage of coolant or extinguishing water in the tank (1300) through the water level display unit and water level warning display unit.

[0066] The tank (1300) may be equipped with a temperature sensor (not shown) capable of checking the temperature of the coolant or fire extinguishing agent contained in the tank (1300). The vehicle device may receive data on the temperature of the coolant or fire extinguishing agent from the temperature sensor and be equipped with a temperature display unit (not shown) that displays the temperature. Through the temperature display unit, the user of the vehicle device can check the temperature of the coolant or fire extinguishing agent.

[0067] Additionally, the vehicle device may be equipped with a temperature warning display unit that can notify the user of the vehicle device when the temperature of the coolant or extinguishing agent contained in the tank (1300) exceeds a preset temperature. If a warning is displayed on the temperature warning display unit, the user of the vehicle device can immediately take action, such as repairing the vehicle device.

[0068] A transparent glass (not shown) may be provided on the side of the tank (1300) to allow the user or mechanic of the vehicle device to visually check the remaining amount of coolant or fire extinguishing agent contained in the tank (1300). This allows the user or mechanic of the vehicle device to directly check the remaining amount of coolant or fire extinguishing agent contained in the tank (1300) with their own eyes.

[0069] The tank (1300) may be equipped with a hose (not shown) for injecting or discharging cooling water or extinguishing water into or out of the tank (1300). The hose may be connected to the tank (1300) through an opening or may be connected directly to the tank (1300) without going through the opening or discharging.

[0070] The tank discharge port (1300a) can automatically discharge cooling water or fire extinguishing water in conjunction with the water level sensor and temperature sensor inside the tank (1300).

[0071] Fig. 5 is a partial drawing showing an enlarged portion of “A” of Fig. 4. Specifically, Fig. 5 shows that the sealing layer (1300b) is ruptured and cooling water or fire extinguishing water is discharged.

[0072] Referring to FIGS. 4 and 5, the sealing layer (1300b) may melt or burst at high temperatures, causing cooling water or extinguishing water to be discharged.

[0073] The sealing layer (1300b) may include a material that melts or ruptures at high temperatures. The sealing layer (1300b) may have a structure that seals the tank (1300) and the tank outlet (1300a) by a method such as fusion. The sealing layer (1300b) may serve to seal the tank outlet (1300a) in environments that are not high temperatures.

[0074] The sealing layer (1300b) may include a material that melts or ruptures only at high temperatures. The material may be determined by the thickness and area of ​​the sealing layer (1300b), the shape and dimensions of the tank outlet (1300a), the distance between the sealing layer (1300b) and the upper portion of the battery pack (1000), etc. For example, the material may be a polyethylene terephthalate (PET) layer, a polyamide (PA) layer, a polycarbonate (PC) layer, or a polypropylene (PP) layer, and the thickness of the sealing layer (1300b) may be determined depending on the characteristics of the material.

[0075] The melting point of the sealing layer (1300b) may be 200°C.

[0076] As described above, when ignition occurs within the battery pack (1000), heat or gas generated within the battery pack (1000) may melt the sealing layer (1300b). That is, as the sealing layer (1300b) surrounding the tank outlet (1300a) melts, the tank outlet (1300a) may be opened. As the tank outlet (1300a) is opened, the cooling water or fire extinguishing water within the tank (1300) may be discharged. The discharged cooling water or fire extinguishing water may be sprayed onto the surface of the battery pack (1000) to lower the temperature of the surface of the battery pack (1000). Through this, ignition of the surface of the battery pack (1000) may be prevented, thereby preventing flames from leaking out and explosions from occurring.

[0077] Referring again to FIGS. 3 to 5, the tank discharge port (1300a) may be provided toward the upper portion of the pack cover (1200).

[0078] Since the tank discharge port (1300a) faces the pack cover (1200), the coolant or extinguishing water discharged from the tank discharge port (1300a) can be mixed with the venting gas discharged from the battery pack (1000). This can reduce the concentration of flammable substances in the gas diffused inside the chassis (10000), thereby preventing ignition on the surface of the battery pack (1000), and further preventing an explosion inside the chassis (10000) due to ignition.

[0079] FIG. 6 is a perspective view showing a battery pack (1000) according to another embodiment of the present invention.

[0080] Referring to FIG. 6, the battery pack (1000) may be equipped with a valve (2100) for discharging internal gas. Gas generated within the battery pack (1000) may be discharged by the valve (2100). Through this, the propagation of thermal runaway of the battery pack (1000) may be prevented and suppressed, and damage to the battery pack (1000) may be minimized.

[0081] The number, location, type, etc. of valves (2100) can be appropriately determined by considering the arrangement of battery modules (110, see FIG. 2) in the battery pack (1000), the structure of the battery modules (110, see FIG. 2), and the venting system.

[0082] Referring again to FIG. 4, the tank (1300) can be secured to the chassis (10000) between the pack cover (1200) and the chassis (10000) inside the vehicle device.

[0083] The tank (1300) can be fixed to the chassis (10000) inside the vehicle device, between the pack cover (1200) and the chassis (10000) inside the vehicle device. This allows the tank (1300) to be fixed even under vibration, impact, or other conditions of the vehicle device, thereby ensuring mechanical rigidity and preventing ignition inside the chassis (10000).

[0084] The tank (1300) can be fixed to the chassis (10000) while minimizing the space between the upper ends through surface contact between the chassis (10000) and the tank (1300). In this case, a gasket (not shown) or the like can be provided between the tank (1300) and the chassis (10000).

[0085] Additionally, the tank (1300) may be fixed to the chassis (10000) by a bolt / nut combination, but is not limited thereto.

[0086] Fig. 7 is an exploded perspective view showing a battery pack (1000) according to another embodiment of the present invention. Fig. 8 is a perspective view showing a battery pack (1000) according to another embodiment of the present invention. Fig. 9 is a plan view showing a battery pack (1000) according to another embodiment of the present invention. Specifically, Fig. 9 is a plan view showing the battery pack (1000) when viewed along the -z-axis direction on the xy plane. Fig. 10 is a plan view showing the battery pack (1000) according to another embodiment of the present invention. Specifically, Fig. 10 is a plan view showing the battery pack (1000) when viewed along the +y-axis direction on the xz plane.

[0087] Referring to FIGS. 7 to 10, a battery pack (1000) is provided in a pack cover (1200) and may include one or more frame members (1500) having cooling water or extinguishing water.

[0088] The frame member (1500) may have a shape that extends in a direction perpendicular to the direction of the longer side of the battery pack (1000), as illustrated in FIGS. 7 to 9. In addition, the frame member (1500) may be provided in multiple pieces, and the multiple frame members (1500) may be arranged at regular intervals along the direction of the longer side of the battery pack (1000).

[0089] According to embodiments of the present invention, since the battery pack (1000) includes one or more frame members (1500) equipped with coolant or extinguishing agent, the temperature of the surface of the battery pack (1000) can be lowered. This prevents ignition of the surface of the battery pack (1000), thereby preventing flames from leaking out and explosions from occurring.

[0090] The frame member (1500) may include an opening (not shown) for injecting or discharging coolant or extinguishing water. A user of the vehicle device or the like may inject or discharge coolant or extinguishing water into the frame member (1500) through the opening, depending on the remaining amount of coolant or extinguishing water within the frame member (1500).

[0091] The frame member (1500) may be equipped with a water level sensor (not shown) capable of checking the remaining amount of coolant or fire extinguishing agent provided in the frame member (1500). The vehicle device may be equipped with a water level display unit (not shown) that receives data on the level of coolant or fire extinguishing agent from the water level sensor and displays the water level. Through the water level display unit, the user of the vehicle device can check the level of coolant or fire extinguishing agent.

[0092] In addition, the vehicle device may be equipped with a water level warning display unit that can notify the user of the vehicle device when the level of coolant or extinguishing agent provided in the frame member (1500) exceeds or falls below a preset level. If a warning is displayed on the water level warning display unit, the user of the vehicle device can immediately take action, such as repairing the vehicle device.

[0093] In addition, the user of the vehicle device can easily check whether there is a leak or leakage of coolant or extinguishing agent within the frame member (1500) through the water level indicator and water level warning indicator.

[0094] The frame member (1500) may be equipped with a temperature sensor (not shown) capable of checking the temperature of the coolant or fire extinguishing agent provided in the frame member (1500). The vehicle device may receive data on the temperature of the coolant or fire extinguishing agent from the temperature sensor and be equipped with a temperature display unit (not shown) that displays the temperature. Through the temperature display unit, the user of the vehicle device can check the temperature of the coolant or fire extinguishing agent.

[0095] Additionally, the vehicle device may be equipped with a temperature warning display unit that can notify the user of the vehicle device when the temperature of the coolant or extinguishing agent provided in the frame member (1500) exceeds a preset temperature. If a warning is displayed on the temperature warning display unit, the user of the vehicle device can immediately take action, such as repairing the vehicle device.

[0096] A transparent glass (not shown) may be provided on the side of the frame member (1500) to allow the user or mechanic of the vehicle device to visually check the remaining amount of coolant or fire extinguishing agent provided in the frame member (1500). This allows the user or mechanic of the vehicle device to directly check the remaining amount of coolant or fire extinguishing agent provided in the frame member (1500) with their own eyes.

[0097] The frame member (1500) may be provided with a hose (not shown) for injecting or discharging cooling water or extinguishing water into or out of the frame member (1500). The hose may be connected to the frame member (1500) through an opening or closing portion, or may be connected directly to the frame member (1500) without going through the opening or closing portion.

[0098] Fig. 11 is a cross-sectional view showing a cross-section taken along the cutting line A-A' of Fig. 9.

[0099] Referring to Fig. 11, the frame member (1500) may be a tubular member having a hollow portion (1500a, cavity part) therein and extending in one direction. Cooling water or extinguishing water may be provided in the hollow portion (1500a).

[0100] Referring to FIGS. 7 to 11, the frame member (1500) may be a tubular member having a hollow portion (1500a) therein and extending in one direction. However, the frame member (1500) in the present invention is not limited to a tubular form, and any form capable of retaining a liquid such as cooling water or extinguishing water is sufficient.

[0101] The hollow portion (1500a) may be provided with cooling water or extinguishing water. The cooling water or extinguishing water may be one of the known ones or a mixture thereof, and any known one may be used as long as it is capable of dissipating heat from the battery cells (100, see FIG. 2) by being retained in the hollow portion (1500a) within the frame member (1500).

[0102] FIG. 12 is a cross-sectional view showing a battery pack (1000) according to another embodiment of the present invention.

[0103] Referring to FIG. 12, the frame member (1500) may include a TIM pad (1600) that contacts the pack cover (1200).

[0104] By providing a TIM pad (1600) between the frame member (1500) and the pack cover (1200), the heat of the pack cover (1200) can be effectively transferred to the frame member (1500). Through this, the temperature of the surface of the battery pack (1000) can be effectively lowered, and ignition of the surface of the battery pack (1000) can be prevented, thereby preventing the outflow of flames.

[0105] There are various types of TIM pads (1600), including thermal grease, thermal sheet, metal plate, and thermally conductive adhesive. Any of the known ones can be used as long as it can transfer the heat of the pack cover (1200) to the frame member (1500).

[0106] FIG. 13 is a cross-sectional view showing a battery pack (1000) according to another embodiment of the present invention.

[0107] Referring to FIG. 13, a vehicle device according to another embodiment of the present invention may include an adhesive tape (1700) positioned between a frame member (1500) and a TIM pad (1600).

[0108] By positioning the adhesive tape (1700) between the frame member (1500) and the TIM pad (1600), the frame member (1500) and the TIM pad (1600) can be fixed, thereby ensuring the mechanical rigidity of the battery pack (1000) in situations such as vibration and impact of the vehicle device.

[0109] The material, area, thickness, etc. of the adhesive tape (1700) can be appropriately determined by considering the size, area, weight, material characteristics, required adhesive strength, thermal conductivity, etc. of the frame member (1500) and the TIM pad (1600).

[0110] The frame member (1500) may include one or more frame member valves (1800) for discharging coolant or extinguishant.

[0111] Referring again to FIGS. 7 through 11, the frame member (1500) may include one or more frame member valves (1800) for discharging cooling water or extinguishing water.

[0112] The coolant or extinguishing agent discharged by the frame member valve (1800) may be vaporized by the heat of the surface of the battery pack (1000) when thermal runaway occurs. By vaporizing the coolant or extinguishing agent, that is, by changing the phase of the coolant or extinguishing agent from liquid to gas, the heat of the surface of the battery pack (1000) is taken away, so that the temperature of the surface of the battery pack (1000) may be lowered. This prevents ignition of the surface of the battery pack (1000), thereby preventing the outflow of flames.

[0113] The number, location, type, etc. of the frame member valves (1800) can be appropriately determined by considering the size of the battery pack (1000), the capacity of the cooling water or extinguishing water in the frame member (1500), etc.

[0114] The frame member valve (1800) can automatically discharge cooling water or fire extinguishing water in conjunction with the water level sensor and temperature sensor within the frame member (1500).

[0115] Fig. 14 is a partial perspective view showing the outlet of the frame member valve (1800) included in the frame member (1500).

[0116] Referring to FIG. 14, the frame member valve (1800) may include a frame member outlet (1800a) facing the pack cover (1200).

[0117] Since the frame member discharge port (1800a) of the frame member valve (1800) faces the pack cover (1200), the coolant or extinguishing water discharged from the frame member discharge port (1800a) of the frame member valve (1800) can be mixed with the venting gas discharged from the battery pack (1000). This can reduce the concentration of flammable substances in the gas diffused inside the chassis (10000), thereby preventing ignition on the surface of the battery pack (1000), and further preventing an explosion inside the chassis (10000) due to ignition.

[0118] The frame member discharge port (1800a) may be oriented along the direction of the longer side of the battery pack (1000).

[0119] Fig. 15 is a cross-sectional view showing a cross-section taken along the cutting line B-B' of Fig. 9.

[0120] Referring to FIGS. 7 to 9 and 15, the frame member (1500) may include a mounting portion (1900) having a mounting hole (1900a) formed therein. A mounting bolt (2000) may pass through the mounting hole (1900a) and be fastened to the pack cover (1200).

[0121] The frame member (1500) may include a mounting portion (1900) having a mounting hole (1900a) formed therein. A mounting bolt (2000) may pass through the mounting hole (1900a) and be fastened to at least one of the pack cover (1200) or the pack frame (1100). That is, the mounting portion (1900) includes a mounting hole (1900a) extending in the -z-axis direction of FIG. 15.

[0122] In addition, the pack cover (1200) includes a fastening hole (not shown) at a position corresponding to the mounting hole (1900a). When the mounting hole (1900a) and the fastening hole are aligned, the frame member (1500) is fixed to the battery pack (1000) by fastening the mounting bolt (2000) passing through them. As one example, the mounting bolt (2000) may be fastened to the pack cover (1200). As another example, the mounting bolt (2000) may be fastened to both the pack cover (1200) and the pack frame (1100). For example, the pack frame (1100) may include a vertical beam (not shown) for dividing the battery cells (100, see FIG. 2) into sections. For stable fastening, the mounting bolt (2000) may be fastened to the vertical beam after passing through the mounting hole (1900a) and the fastening hole of the pack cover (1200). Alternatively, the mounting bolt (2000) may be bolted to a separate nut member (not shown) after passing through the vertical beam.

[0123] For effective fixation, it is preferable that the mounting portion (1900) and mounting bolt (2000) applied to each frame member (1500) be configured in multiple numbers.

[0124] FIG. 16 is a cross-sectional view showing a battery pack (1000) according to another embodiment of the present invention.

[0125] Referring to FIG. 16, the frame member (1500) may include a first hollow portion (1500b) and a second hollow portion (1500c) in which cooling water or extinguishing water is provided. A mounting portion (1900) may be positioned between the first hollow portion (1500b) and the second hollow portion (1500c).

[0126] The first hollow portion (1500b) and the second hollow portion (1500c) may each include a first opening / closing portion (not shown) and a second opening / closing portion (not shown). Users of the vehicle device, etc., may inject or discharge coolant or fire extinguishing water into both the first hollow portion (1500b) and the second hollow portion (1500c), or into either the first hollow portion (1500b) or the second hollow portion (1500c), depending on the remaining amount of coolant or fire extinguishing water in the first hollow portion (1500b) and the second hollow portion (1500c) through the first opening / closing portion and the second opening / closing portion.

[0127] The first hollow portion (1500b) and the second hollow portion (1500c) may each be provided with a first water level sensor (not shown) and a second water level sensor (not shown). The vehicle device may receive data on the water level of the cooling water or the fire extinguishing water within the first hollow portion (1500b) and the second hollow portion (1500c) from the first water level sensor and the second water level sensor, respectively, and may be provided with a first water level display unit and a second water level display unit that display the water level. Through the first water level display unit and the second water level display unit, the user of the vehicle device can check the water level of the cooling water or the fire extinguishing water within the first hollow portion (1500b) and the second hollow portion (1500c), respectively.

[0128] In addition, the vehicle device may be provided with a first water level warning display unit and a second water level warning display unit that can notify a user of the vehicle device when the level of the cooling water or fire extinguishing water in the first hollow section (1500b) or the second hollow section (1500c) exceeds or falls below a preset level. If a warning is displayed on both the first water level warning display unit and the second water level warning display unit, or if a warning is displayed on one of the first water level warning display unit and the second water level warning display unit, the user of the vehicle device can immediately take measures such as repairing the vehicle device.

[0129] In addition, the user of the vehicle device can easily check whether there is a leak or leakage of coolant or extinguishing water within the frame member (1500) through the first water level indicator, the second water level indicator, the first water level warning indicator, and the second water level warning indicator.

[0130] The first hollow portion (1500b) and the second hollow portion (1500c) may each be equipped with a first temperature sensor (not shown) and a second temperature sensor (not shown). The vehicle device may receive data on the temperature of the coolant or fire extinguishing water within the first hollow portion (1500b) and the second hollow portion (1500c) from the first temperature sensor and the second temperature sensor, respectively, and may be equipped with a first temperature display unit and a second temperature display unit that display the temperature. Through the first temperature display unit and the second temperature display unit, the user of the vehicle device can check the temperature of the coolant or fire extinguishing water within the first hollow portion (1500b) and the second hollow portion (1500c), respectively.

[0131] In addition, the vehicle device may be provided with a first temperature warning display unit and a second temperature warning display unit that can notify a user of the vehicle device when the temperature of the coolant or extinguishing water in the first hollow section (1500b) or the second hollow section (1500c) exceeds or falls below a preset temperature. If a warning is displayed on both the first temperature warning display unit and the second temperature warning display unit, or if a warning is displayed on one of the first temperature warning display unit and the second temperature warning display unit, the user of the vehicle device can immediately take measures such as repairing the vehicle device.

[0132] In addition, the user of the vehicle device can easily check whether there is a leak or leakage of coolant or extinguishing agent within the frame member (1500) through the first temperature display unit, the second temperature display unit, the first temperature warning display unit, and the second temperature warning display unit.

[0133] The first hollow part (1500b) and the second hollow part (1500c) may be provided with a first hose and a second hose for injecting or discharging cooling water or fire extinguishing water into or out of the first hollow part (1500b) and the second hollow part (1500c), respectively. The first hose and the second hose may communicate with the first hollow part (1500b) and the second hollow part (1500c) through the first opening and closing portion and the second opening and closing portion, or may communicate directly with the frame member (1500) without going through the first opening and closing portion.

[0134] Referring again to FIGS. 14 and 16, the first hollow portion (1500b) and the second hollow portion (1500c) may each be provided with a frame member valve (1800). Depending on the temperature or remaining amount of the cooling water or extinguishing water within the first hollow portion (1500b) and the second hollow portion (1500c), each frame member valve (1800) may independently discharge the cooling water or extinguishing water. Specifically, regardless of whether the frame member valve (1800) provided in the second hollow portion (1500c) is operated, only the frame member valve (1800) provided in the first hollow portion (1500b) may be operated to discharge the cooling water or extinguishing water within the first hollow portion (1500b).

[0135] A mounting portion (1900) may be positioned between the first hollow portion (1500b) and the second hollow portion (1500c). That is, the first hollow portion (1500b) and the second hollow portion (1500c) may be partitioned by the mounting portion (1900).

[0136] The frame member (1500) can be welded to the pack cover (1200). Through the welding process between the frame member (1500) and the pack cover (1200), the frame member (1500) can be more securely fixed to the pack cover (1200), thereby ensuring the mechanical rigidity of the battery pack (1000).

[0137] Welding-related factors such as welding method, welding area, and welding agent can be appropriately determined by considering the size of the battery pack (1000), the size and weight of the frame member (1500), and the material properties of the battery pack (1000) and the frame member (1500).

[0138] Fig. 17 is a cross-sectional view illustrating a chassis (10000) within a vehicle device according to another embodiment of the present invention. Specifically, Fig. 17 illustrates a chassis (10000), a tank (1300), a frame member (1500), and a battery pack (1000). A detailed description of each component is omitted as it overlaps with the previously described content.

[0139] Referring to FIG. 17, the frame member (1500) may be fixed to the pack cover (1200) between the pack cover (1200) and the chassis (10000) inside the vehicle device. More specifically, the frame member (1500) may be positioned between the pack cover (1200) and the tank (1300) and may be fixed to the pack cover (1200). A description of how the frame member (1500) is fixed to the pack cover (1200) is omitted as it overlaps with the previously described content.

[0140] Through this, the frame member is fixed to the pack cover even in situations such as vibration or impact of the vehicle device, thereby securing mechanical rigidity and preventing ignition inside the chassis.

[0141] In this example, terms indicating directions such as front, back, left, right, up, and down are used, but these terms are only for convenience of explanation and may vary depending on the location of the target object or the location of the observer.

[0142] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0143] Description of the symbol

[0144] 1000: Battery pack

[0145] 1100: Pack Frame

[0146] 1200: Pack Cover

[0147] 1300: Tank

[0148] 1300a: Tank drain

[0149] 1300b: Sealing layer

[0150] 1500: Frame absence

[0151] 10000: Chassis

Claims

1. Battery pack; and including tanks; The above battery pack, Multiple battery cells; A pack frame in which the battery cells are directly mounted or in which the battery cells are mounted in a state of being housed in a module frame; A pack cover covering the above pack frame; The above tank, Coolant or extinguishing water; A tank outlet through which the cooling water or extinguishing water is discharged; and A vehicle device comprising a sealing layer provided on one side where the tank discharge port is arranged.

2. In paragraph 1, A vehicle device in which the sealing layer melts or ruptures at high temperatures, thereby discharging the coolant or extinguishing water.

3. In paragraph 1, A vehicle device wherein the tank discharge port is provided toward the upper portion of the pack cover.

4. In paragraph 1, A vehicle device, wherein the battery pack has a valve for discharging internal gas.

5. In the vehicle device according to paragraph 1, A vehicle device wherein the tank is fixed to the chassis between the pack cover and the chassis inside the vehicle device.

6. In paragraph 1, A vehicle device, wherein the battery pack is provided on the pack cover and includes one or more frame members having coolant or extinguishing agent.

7. In paragraph 6, A vehicle device wherein the frame member is a tubular member having a cavity part inside and extending in one direction, and wherein the cooling water or the fire extinguishing water is provided in the cavity part.

8. In paragraph 6, A vehicle device, wherein the frame member includes a TIM pad that contacts the pack cover.

9. In paragraph 8, A vehicle device comprising an adhesive tape positioned between the frame member and the TIM pad.

10. In paragraph 6, A vehicle device, wherein the frame member includes one or more frame member valves for discharging coolant or extinguishant.

11. In paragraph 10, A vehicle device wherein the frame member valve includes a frame member outlet facing the pack cover.

12. In paragraph 6, The above frame member includes a mounting portion having a mounting hole formed therein, A vehicle device, wherein a mounting bolt passes through the mounting hole and is fastened to the pack cover.

13. In paragraph 12, A vehicle device wherein the frame member includes a first hollow portion and a second hollow portion in which the cooling water or the extinguishing water is provided, and the mounting portion is positioned between the first hollow portion and the second hollow portion.

14. In paragraph 6, A vehicle device wherein the frame member is welded to the pack cover.

15. In paragraph 6, A vehicle device wherein the frame member is fixed to the pack cover between the pack cover and the chassis inside the vehicle device.

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