Fire diffusion prevention system for electric vehicle

Abstract

The present invention relates to a fire diffusion prevention system for an electric vehicle, the system, in a pack case (110) of a battery pack (100) provided with a plurality of module storage compartments separating battery modules (120) by means of partitions (130) into the left and right sides thereof so that a pipe passage (140) is provided therein, is equipped with an automatic fire extinguishing device for a battery pack, which applies a fire-resistant coating to the inner surface of each module storage compartment and supplies a fire extinguishing liquid to the battery modules to suppress fire, and a module connection wiring circuit breaker for disconnecting connection wiring between battery modules, to rapidly suppress fire caused by a battery by employing the automatic fire extinguishing device, and electrically separate the battery modules by disconnecting the connection wiring to reduce voltage, thus weakening electrical explosion of a battery due to high voltage, and additionally provided are a toxic gas combustion part and a flame guidance-discharge device comprising a first and a second flame guidance-discharge ducts (190a, 190b) at flame outlets (111), provided at the respective module storage compartments of the pack case (110), and an extraction duct which is provided at the rear of the second flame guidance-discharge duct and can be moved to the outside of a vehicle body, to discharge flame and hot air to the outside of a vehicle body, and combust toxic gas, thereby preventing flame from spreading to other places and reducing casualties at fire sites.

Description

Electric vehicle fire spread prevention system

[0001] The present invention relates to a fire spread prevention system for an electric vehicle, and more specifically, to a fire spread prevention system for an electric vehicle that, when a fire occurs in the battery of an electric vehicle, rapidly suppresses the fire using an automatic fire extinguishing device equipped in the vehicle at the battery module level, and simultaneously cuts off the connecting wiring between battery modules to prevent the fire from spreading to other areas.

[0002] Generally, the types of batteries installed and used in electric vehicles currently being produced and sold (hereinafter referred to as "electric vehicles") are classified into lithium-ion batteries, which have high energy density and long lifespan, and nickel-hydrogen batteries, which charge quickly and have good durability.

[0003] If the batteries of such electric vehicles are subjected to strong physical impact due to external collisions while driving, causing damage to the separator, or if the voltage rises due to overcharging during charging, causing swelling inside the battery and damaging the separator, thermal runaway due to overheating may occur, posing a risk of fire and explosion.

[0004] In addition, fires caused by thermal runaway in electric vehicle batteries are occurring not only when subjected to external physical impact or during charging, as described above, but also in electric vehicles driving on the road or parked for a long time due to battery overheating of unknown cause; however, the exact cause of this thermal runaway phenomenon in batteries has not yet been identified.

[0005] Furthermore, the reason it is difficult to extinguish fires in electric vehicles is that the battery pack is covered by upper and lower metal casings, preventing water and extinguishing agents from penetrating from the outside.

[0006] If we look at conventional methods used to extinguish fires in electric vehicles, liquid or gaseous extinguishing agents are sprayed onto the battery and vehicle body from the outside to prevent thermal runaway of the battery, or the fire is extinguished by covering it with a suffocation cover, or

[0007] A temporary water tank is installed to surround the vehicle body, and the tank is filled with fire extinguishing agent or water to immerse the battery of the burning electric vehicle in the agent or water, thereby suppressing the fire.

[0008] As mentioned above, fire suppression methods using suffocation covers or water tanks are methods currently implemented by the National Fire Agency as part of its accident response manual.

[0009] In addition, as a prior art related to electric vehicle fire suppression, there is the ‘method for suppressing fire in an electric vehicle using a rapid-installation water tank’ disclosed in ‘Patent Document 1’ of the prior art literature below, Korean Registered Patent Publication No. 10-2645759 (published on March 11, 2024).

[0010] The above 'Patent Document 1' is a method of transporting a water tank to the area where an electric vehicle fire occurred, installing the water tank to surround the electric vehicle that caught fire, and then filling the water tank with water to suppress the thermal runaway of the electric vehicle's battery.

[0011] However, this has the problem that the amount of water required to fill the tank is high, and since the water filled in this way is inefficient for completely extinguishing a fire caused by a battery runaway, it takes a considerably long time to suppress.

[0012] Another prior art is the ‘fire suppression system for electric vehicle charging stations’ disclosed in ‘Patent Document 2’, Korean Registered Patent Publication No. 10-2577099 (published September 12, 2023).

[0013] The above 'Patent Document 2' is configured to detect the presence of fire by installing a camera measuring device that captures general images and thermal images in a parking area equipped with an electric vehicle charger, and to prevent the external exposure of flames by having a flame-retardant film folded above the charging parking area unfold and cover the parked electric vehicle when a fire occurs, and to suppress the fire by spraying a fire extinguishing agent from an agent tank into the flame-retardant film.

[0014] Furthermore, when the advanced rod installed on the floor of the charging area penetrates the floor of the electric vehicle and enters the battery, the fire extinguishing liquid from the chemical tank is injected into the battery through the rod to extinguish the fire.

[0015] This ‘Patent Document 2’ is only capable of suppressing fires in electric vehicles parked in parking areas equipped with chargers, and has the problem of being difficult to deal with when a fire occurs in an electric vehicle parked in a general parking area or due to a collision while driving on the road.

[0016] In addition, if a fire breaks out in an electric vehicle in a place where fire trucks have difficulty entering, such as an underground parking lot of a building, and initial suppression is not effective, the fire can spread to numerous vehicles parked nearby, causing massive material damage.

[0017] For example, recently, an unexplained fire broke out in an electric vehicle parked in the underground parking lot of an apartment complex in Incheon. As a result of the failure to suppress the battery, which experienced rapid thermal runaway, more than 140 of the hundreds of vehicles parked nearby were completely burned or scorched, causing damage to their bodies. Additionally, various pipes and cables installed in the ceiling of the underground parking lot melted, leading to water and power outages.

[0018] In addition, when a battery fire occurs in an electric vehicle, the fire becomes larger due to thermal runaway caused by overheating resulting from contact between the positive and negative electrodes as the separator is damaged, and toxic gases such as carbon monoxide, hydrofluoric acid, and toluene generated from the battery can cause casualties.

[0019] In particular, the risk is significantly increased in enclosed underground parking lots, where toxic gases cannot escape easily, making it difficult to enter the fire scene; however, existing fire suppression systems currently fail to provide methods to reduce the toxic gases generated during such battery fires.

[0020] [Prior Art Literature]

[0021] [Patent Literature]

[0022] (Patent Document 1) 'Method for suppressing fire in electric vehicles using a rapid-installation water tank' of Korean Registered Patent Publication No. 10-2645759 (Published March 11, 2024)

[0023] (Patent Document 2) 'Fire suppression system for electric vehicle charging stations' of Korean Registered Patent Publication No. 10-2577099 (Published Sept. 12, 2023)

[0024] The fire suppression method or fire suppression system of the aforementioned prior art has a problem in that it cannot quickly prevent the fire originating inside the battery pack from spreading to other areas, resulting in a long time required for fire suppression.

[0025] Accordingly, the present invention, developed to improve upon the problems of the aforementioned prior art, aims to provide a fire spread prevention system for an electric vehicle that automatically extinguishes and suppresses a battery fire early when the electric vehicle is parked or driving on the road, and prevents the fire from spreading to other places by disconnecting the connecting wiring between battery modules.

[0026] Another objective of the present invention is to prevent the spread of fire by guiding and discharging the flames and ignition sources inside the battery pack that has caught fire to the outside of the vehicle body.

[0027] Another objective of the present invention is to reduce damage at the scene of a fire by enabling the reduction of toxic gases generated from a battery that has caught fire.

[0028] To achieve the above objective, the present invention is characterized by a battery pack installed in an electric vehicle having a plurality of module storage compartments formed on the left and right sides by partitions, with a piping passage provided in the center of the pack case, wherein fire-resistant paint is applied to the entire inner surface of each module storage compartment, and by providing an automatic battery pack fire extinguishing device that supplies fire extinguishing liquid to the battery modules to suppress the fire in the event of a battery fire, and a module connection wiring cutoff device that cuts off the connecting wiring between battery modules, thereby rapidly suppressing the fire with the automatic fire extinguishing device in the event of a fire caused by the battery and lowering the voltage by electrically isolating the battery modules through the cutting of the connecting wiring between battery modules, thereby weakening the electrical explosion of the battery caused by high voltage.

[0029] In addition, the device is characterized by further providing a flame-inducing exhaust device in which a first flame-inducing exhaust pipe and a second flame-inducing exhaust pipe are provided in flame exhaust ports for each module storage compartment on the upper side frame of the pack case, and an extraction pipe installed to slide in and out at the rear of the second flame-inducing exhaust pipe is exposed to the outside of the vehicle body by the pressure of the discharged flame and fire, thereby discharging the flame and fire inside the battery discharged due to a fire to the outside of the vehicle body, so as to prevent the fire from spreading to other places.

[0030] In addition, it is characterized by having a toxic gas combustion unit further provided at the rear of the extraction pipe constituting the flame-induced exhaust device to efficiently burn and discharge the toxic gas being discharged.

[0031] The present invention has the effect of rapidly suppressing a fire in the early stages through an automatic fire extinguishing device equipped in the vehicle when a fire occurs in an electric vehicle while charging, parked, or while driving, and of weakening the electrical explosion of the battery caused by high voltage by lowering the voltage through electrically disconnecting the battery modules by cutting off the connecting wiring between the battery modules.

[0032] In addition, by using a flame exhaust device to vent flames and heat from inside the battery pack to the outside of the vehicle body and effectively burning and expelling toxic gases generated inside the battery pack to the outside, it prevents the spread of fire and effectively minimizes damage caused by toxic gases at the fire scene.

[0033] FIG. 1 is a side view of the fire spread prevention system of the present invention mounted on a vehicle.

[0034] FIG. 2 is a plan view of the fire prevention system of the present invention mounted on a vehicle.

[0035] FIG. 3 is an exploded perspective view showing an example of the battery pack structure of the present invention.

[0036] FIG. 4 is a plan view showing the state in which the wiring circuit breaker of the present invention is equipped in a battery pack.

[0037] FIG. 5 is a partial enlarged cross-sectional view of the wiring circuit breaker of FIG. 4 installed in the battery pack.

[0038] FIG. 6 is a side view of the flame-induced exhaust device of the present invention mounted on a vehicle.

[0039] FIG. 7 is a plan view of the flame-induced exhaust device of the present invention mounted on a vehicle.

[0040] FIG. 8 is a partial enlarged cross-sectional view of a battery pack equipped with the flame-induced exhaust device of the present invention.

[0041] FIGS. 9a and 9b are diagrams showing the state in which the extraction pipe is operated in the flame-induced exhaust device of the present invention.

[0042] FIGS. 10a and 10b are diagrams showing the state in which the exposed pipe is operated in the flame-induced exhaust device of the present invention.

[0043] [Explanation of the symbol]

[0044] 100 : Battery pack

[0045] 110 : Pack case

[0046] 110a: Upper cover

[0047] 110b: Side frame

[0048] 110c: Bottom cover

[0049] 111 : Flame exhaust

[0050] 112 : Sealing barrier

[0051] 113 : Check valve

[0052] 120 : Battery module

[0053] 130 : Partition

[0054] 140 : Pipe passage

[0055] 150: Digestive fluid supply tube

[0056] 151 : Sprinkler head

[0057] 152 : Valve

[0058] 160 : Fire detector

[0059] 170 : Fire extinguishing liquid tank

[0060] 171 : Pump

[0061] 172 : Control section

[0062] 180a~180c: 1st busbar to 3rd busbar

[0063] 181 : Module connection wiring

[0064] 182 : Circuit breaker

[0065] 183 : Thermal sensor

[0066] 184 : Circuit breaker control unit

[0067] 190a: First flame induction exhaust pipe

[0068] 190b: Second flame induction exhaust pipe

[0069] 191 : Oxygen inlet

[0070] 200 : Outlet pipe

[0071] 201 : Tension spring

[0072] 202 : Perforated board

[0073] 210 : Exposed piping

[0074] 211 : Hinge part

[0075] 220 : Toxic gas combustion section

[0076] The following description regarding the present invention is merely an example for structural or functional explanation, and therefore the scope of the present invention should not be interpreted as being limited by the examples specified in the text. That is, since the examples can be modified in various ways and can take various forms, the scope of the present invention should be understood to include equivalents capable of realizing the technical concept.

[0077] Furthermore, the purposes or effects presented in this invention do not imply that specific embodiments must include all of them or only such effects; therefore, the scope of the rights of this invention should not be understood as being limited by them.

[0078] A preferred technical configuration and operation for implementing the present invention will be described in detail below with reference to the attached drawings.

[0079] FIG. 1 is a side view showing the fire spread prevention system of the present invention mounted on a vehicle, FIG. 2 is a bottom view showing the fire spread prevention system of the present invention mounted on a vehicle, FIG. 3 is an exploded perspective view showing the battery pack structure of the present invention as an example, FIG. 4 is a plan view showing the wiring circuit breaker of the present invention provided in a battery pack, and FIG. 5 is a cross-sectional view showing a partially enlarged view of the wiring circuit breaker of FIG. 4 installed inside the battery pack.

[0080] As described herein, the electric vehicle fire spread prevention system of the present invention is characterized by comprising a battery pack (100) in which a number of module storage compartments are sealed and isolated, an automatic battery pack fire extinguishing device provided on one side of the battery pack, a module connection wiring cutoff device provided in the battery pack, and a flame induction discharge device that discharges flames and fire generated inside the battery pack to the outside of the vehicle body.

[0081] As shown in FIG. 3, the battery pack (100) installed in the electric vehicle has a pipe passage (140) between two module storage compartments partitioned by a partition (130) inside the pack case (110), and fire-resistant paint is applied to the inner surface of each module storage compartment and the inner surface of the upper and lower covers (110a) (110c) and the side frame (110b) constituting the pack case (110), and battery modules (120) are installed separately in each module storage compartment.

[0082] These pack cases (110) delay the time for thermal runaway and fire to spread between battery modules as much as possible.

[0083] The above battery pack automatic fire extinguishing device is configured with a fire extinguishing liquid supply pipe (150) arranged at predetermined intervals so that a closed-type sprinkler head (151) that opens and closes with a valve (152) as shown in FIG. 2 is placed in each module storage compartment, and a fire detector (160) is also installed in each module storage compartment, and a fire extinguishing liquid tank (170) and a pump (171) installed outside the battery pack (100) to pump and supply fire extinguishing liquid to the fire extinguishing liquid supply pipe (150), and a control unit (172) that receives signals from the fire detector (160) placed in each module storage compartment and controls the opening and closing of the valve (152) and the operation of the pump (171).

[0084] The above-mentioned closed-type sprinkler head (151) is equipped with a heat-sensitive element, so that the water outlet is closed in a normal state, and when the heat-sensitive element itself melts and is destroyed by the heat generated during a fire, the heat-sensitive element detaches from the head, and the water outlet opens to discharge fire extinguishing liquid.

[0085] The above-mentioned battery pack automatic fire extinguishing device automatically sprays extinguishing liquid through sprinkler heads that operate under the control of a fire detector and monitoring and control system when a battery fire occurs, thereby suppressing the fire at the initial stage at the battery cell and battery module level.

[0086] The above module connection wiring cutoff device comprises a wiring breaker (182) installed at the contact point of the module connection wiring (181) and any one of the first bus bar (180a) to the third bus bar (180c) that connects the negative and positive electrodes between each battery module (120) in series as shown in FIGS. 4 and 5, and a wiring cutoff control unit (184) that receives a signal from a heat detection sensor (183) placed in each module storage compartment and controls the wiring cutoff operation of each wiring breaker (182).

[0087] In the drawing, the unexplained symbol (185) is a BMS (battery management system), and (175) is a valve installed in each fire extinguishing fluid supply line in the battery pack automatic fire extinguishing device.

[0088] Also, the fire extinguishing liquid supplied through the fire extinguishing liquid supply pipe (150) is a collective term for fire extinguishing materials such as fire extinguishing water, fire fighting water, fire extinguishing solution and fire extinguishing gas, and will be described as 'fire extinguishing liquid' below.

[0089] In this invention, the fire-resistant paint applied to the inner surface including the upper and lower covers (110a) (110c), the side frame (110b), and the partition (130) of the pack case (110) significantly reduces the thermal conductivity of the pack case forming the module storage compartment when a spark occurs between battery modules, thereby primarily preventing the spread of battery fire.

[0090] And when a fire occurs in the battery of an electric vehicle, the battery pack automatic fire extinguishing device detects this and automatically sprays the fire extinguishing liquid onto the battery module (120) where the fire occurred.

[0091] That is, the control unit (172) that receives the signal from the fire detector (160) opens the nozzle of the fire extinguishing liquid tank (170) and activates the pump (171), so that the fire extinguishing liquid is pumped into the fire extinguishing liquid supply pipe (150) and automatically sprayed into the battery module (120) where the fire occurred through the closed sprinkler head (151), so that the fire is quickly suppressed in the early stages.

[0092] Here, the battery pack automatic fire extinguishing device can be used as a fire extinguishing agent by connecting the existing coolant tank (173) equipped in the vehicle as shown in FIG. 2 to the pump (171) and pumping the coolant filled in the coolant tank (173) to the fire extinguishing agent supply pipe (150).

[0093] And the module connection wiring cutoff device illustrated in FIG. 4 can prevent the spread of fire by lowering the voltage of the battery pack (100) when an abnormal sign, such as a fire or heat generation, is detected by a heat detection sensor (183) in a battery module (120) isolated in each module storage compartment, and the wiring cutoff control unit (184) that receives the detection signal cuts off the module connection wiring (181) connected between each battery module (120) through a wiring cutoff device (182).

[0094] In other words, the present invention can rapidly suppress a fire using an automatic fire extinguishing device when a battery fire occurs in an electric vehicle, and by disconnecting the module connection wiring between battery modules, the spread of the fire to other areas can be prevented as much as possible.

[0095] The present invention is characterized by having a flame-induced exhaust device comprising: a flame exhaust port (111) provided at the top of each module storage compartment of the side frames (110b) forming the pack case (110) as shown in FIGS. 7 and 8; two first flame-induced exhaust pipes (190a) provided on the outside of the pack case (110) to be connected to the flame exhaust port (111); and a second flame-induced exhaust pipe (190b) having a tip connected to the first flame-induced exhaust pipe (190a) and a tip protruding to the outside of the vehicle body.

[0096] This flame-induced exhaust device expels thermal runaway, flames, gases, and pressure generated during a fire to the outside of the electric vehicle body through a flame-induced exhaust pipe connected to the flame exhaust port.

[0097] As an embodiment, the flame-induced discharge device may further include a discharge pipe (200) that is inserted to be pulled out in a sliding manner by a tension spring (201) at the end of the second flame-induced discharge pipe (190b) as shown in FIG. 9a and 9b, and has a perforated plate (202) inside.

[0098] Since the above-mentioned extraction pipe (200) is pulled by a tension spring (201), it normally remains in a state fitted to the end of the second flame-induced discharge pipe (190b) as shown in FIG. 9a.

[0099] In such a state, when the pressure inside the battery pack increases due to a fire in the battery module (120), the pressure of the flame and fire discharged through the flame exhaust port (111), the first flame-induced exhaust pipe (190a), and the second flame-induced exhaust pipe (190b) reaches the perforated plate (202). Since the perforated plate (202) has small holes formed therein, it generates pressure resistance that pushes the perforated plate (202) while the pressure is escaping.

[0100] Therefore, the extraction pipe (200) is slid and pushed by a certain distance, and as a result, the end of the extraction pipe (200) protrudes outward from the vehicle body as shown in FIGS. 6 and 7, and as a result, flames and fire generated inside the battery pack (100) can be discharged outward from the vehicle body through the extraction pipe (200) protruding outward from the vehicle body, thereby preventing the fire from spreading to the vehicle body.

[0101] In another embodiment, this flame-induced exhaust device may be composed of: an extraction pipe (200) that is inserted into the second flame-induced exhaust pipe (190b) as shown in FIG. 10a to be pulled by a tension spring (201) and then pulled out in a sliding manner, and which has a perforated plate (202) inside; and an exposed pipe (210) that is connected to the end of the second flame-induced exhaust pipe (190b) by a hinge part (211) having a torsion spring, rotates at a right angle by receiving the force of the torsion spring, and then rotates in a horizontal state by being pushed by the extraction pipe (200) when the extraction pipe (200) is pulled out.

[0102] As described above, when a fire occurs in the battery pack, the extraction pipe (200) slides backward due to pressure resistance acting on the perforated plate (202). As the extraction pipe (200) is pushed backward in this manner, it pushes the exposed pipe (210), which was standing upright at a right angle by the hinge part (211), so the exposed pipe (210) compresses the torsion spring and lies horizontally, protruding outward from the vehicle body.

[0103] Therefore, flames and fire generated inside the battery pack (100) can be discharged to the outside of the vehicle body through the exposed pipe (210), so that the fire can be prevented from spreading to the vehicle body.

[0104] When the pressure resistance pushing the withdrawal pipe (200) backward is released, the withdrawal pipe (200) is pulled back to its original position by the force of the tension spring (201), and the exposed pipe (210) is returned to its original position at a right angle by the force of the compressed torsion spring.

[0105] The present invention provides flame-induced exhaust devices at the front and rear of an electric vehicle so that, in the event of a battery fire, flames and fire radiating from inside the battery pack (100) can be rapidly discharged together to the front and rear outside of the vehicle body.

[0106] Additionally, the flame exhaust port (111) may be further equipped with a sealing blocker (112) and a backflow prevention valve (113) that open due to the internal pressure of the battery generated during a battery fire, as shown in FIG. 8. Then, foreign substances such as rainwater, wind, and dust can be effectively prevented from entering the battery pack (100) from the outside through the flame exhaust port (111) in normal circumstances.

[0107] In addition, the flame-induced exhaust device is characterized by having a plurality of small-diameter oxygen inlet holes (191) formed at the end of the second flame-induced exhaust pipe (190b) to which the extraction pipe (200) overlaps as shown in FIG. 9b and FIG. 10b, and the extraction pipe (200) or the exposed pipe (210) is equipped with a toxic gas combustion section (220) that burns toxic gas with an ignition coil.

[0108] Then, normally, the oxygen inlet port (191) is covered by the overlapping outlet pipe (200), but when the outlet pipe (200) is moved due to a battery fire, the oxygen inlet port (191) is exposed. Since the flame and fire passing through the outlet pipe (200) fuse with the oxygen of the air entering through the oxygen inlet port (191) due to the pressure difference, the toxic gas is burned by the good spark input ignition of the ignition coil when passing through the toxic gas combustion section (220), thereby significantly reducing the amount of toxic gas leaking to the outside, so that damage caused by toxic gas at the fire scene can be minimized.

[0109] And the above battery pack automatic fire extinguishing device may be connected to a pump (171) so that the coolant from the existing coolant tank (173) equipped in the vehicle as shown in FIG. 2 can be pumped and supplied to the fire extinguishing liquid supply pipe (150), thereby allowing the coolant to be used as a fire extinguishing liquid.

[0110] In this invention, when a fire occurs in a battery module (120) of a module storage compartment, a control unit that receives a signal from a sensor detecting the fire may open only the valve of the sprinkler head (151) in the module storage compartment where the fire occurred, thereby spraying fire extinguishing liquid only on the battery module (120) of the module storage compartment where the fire occurred.

[0111] Although the invention made by the inventors has been specifically described according to the above embodiments, it is obvious to those skilled in the art that the invention is not limited to the above embodiments and can be modified in various ways without departing from the gist thereof.

Claims

1. A battery pack (100) installed in an electric vehicle, wherein a pipe passage (140) is provided between two module storage compartments partitioned by a partition (130) inside a pack case (110), fire-resistant paint is applied to the inner surface of each module storage compartment and the inner surface of the pack case (110), and battery modules (120) are isolated and installed in each of the two module storage compartments; A battery pack automatic fire extinguishing device comprising: a sprinkler head (151) and a fire detector (160) installed at predetermined intervals in a fire extinguishing liquid supply pipe (150) installed in a pipe passage (140) inside the battery pack (100) and a fire extinguishing liquid tank (170) and a pump (171) that pump and supply fire extinguishing liquid to the fire extinguishing liquid supply pipe (150) outside the battery pack (100), and a control unit (172) that controls the opening and closing of a valve (175) and the operation of a pump (171) by receiving a signal from a fire detector (160) installed in each module storage compartment; A module connection wiring cutoff device comprising a wiring cutoff control unit (184) that controls the wiring cutoff operation of each wiring cutoff device (182) by receiving a signal from a heat detection sensor (183) placed in each module storage compartment, wherein a wiring cutoff device (182) is installed at the contact point of a module connection wiring (181) and one end of a first bus bar (180a) to a third bus bar (180c) that connects the negative and positive electrodes of each battery module (120) in series; An electric vehicle fire spread prevention system characterized by being composed of a fire suppression device that prevents the spread of fire by rapidly extinguishing the fire and rapidly disconnecting the connecting wires between battery modules in the event of a fire caused by the battery.

2. In Paragraph 1, Both side frames (110b) forming the pack case (110) are provided with a flame exhaust port (111) at the top in each module storage compartment, and A flame-induced exhaust device comprising: a first flame-induced exhaust pipe (190a) provided on the outside of a pack case (110) to be connected to the flame exhaust port (111); and a second flame-induced exhaust pipe (190b) having a tip connected to the first flame-induced exhaust pipe (190a) and an end protruding to the outside of the vehicle body. A fire spread prevention system for an electric vehicle characterized by being equipped with a device to guide and discharge flames to the outside of the vehicle body.

3. In Paragraph 2, The flame-induced exhaust device is, A pull-out pipe (200) that is fitted to the end of the second flame-induced discharge pipe (190b) so as to be pulled by a tension spring (201), and slides backward and protrudes to the outside of the vehicle body when the pressure of the flame and fire discharged to the perforated plate (202) provided inside. A fire spread prevention system for an electric vehicle characterized by having [ ] 4. In Paragraph 2, The flame-induced exhaust device is, A pull-out pipe (200) that is fitted to the end of the second flame-induced discharge pipe (190b) so as to be pulled by a tension spring (201) and slides backward when the pressure of the flame and fire discharged to the internal perforated plate (202) is applied; and An exposed pipe (210) that is connected to the end of the second flame-inducing discharge pipe (190b) by a hinge portion (211) and is in a right-angled state by a torsion spring, then rotates to a horizontal state and protrudes outside the vehicle body when pushed by a sliding pull-out pipe (200); A fire spread prevention system for an electric vehicle characterized by having [ ] 5. In Paragraph 2, By equipping the front and rear of the electric vehicle with flame-induced exhaust devices A fire spread prevention system for an electric vehicle characterized by allowing flames and fire inside the battery pack (100) to be discharged together to the front and rear outside of the vehicle body in the event of a battery fire.

6. In Paragraph 2, The flame exhaust port (111) is, A fire spread prevention system for an electric vehicle characterized by having a sealing barrier (112) that opens due to internal pressure of the battery generated during a battery fire, and a backflow prevention valve (113) that prevents foreign substances such as rainwater, wind, and dust from entering from the outside.

7. In Paragraph 3 or 4, The flame-induced exhaust device is, A plurality of small-diameter oxygen inlet holes (191) are formed at the end of the second flame-induced discharge pipe (190b) to which the extraction pipe (200) overlaps so that it is exposed to the outside when the extraction pipe (200) is pushed backward, and A fire spread prevention system for an electric vehicle, characterized in that the extraction pipe (200) or the exposed pipe (210) further comprises a toxic gas combustion section (220) that burns toxic gas with an ignition coil.

8. In Paragraph 1, The battery pack automatic fire extinguishing device is, A fire spread prevention system for an electric vehicle characterized by being connected to a pump (171) so that the coolant from an existing coolant tank (173) provided in the vehicle can be pumped and supplied to a fire extinguishing liquid supply pipe (150) and used as a fire extinguishing liquid.

9. A battery pack (100) installed in an electric vehicle, wherein a pipe passage (140) is provided between two module storage compartments partitioned by a partition (130) inside a pack case (110), fire-resistant paint is applied to the inner surface of each module storage compartment and the inner surface of the pack case (110), and battery modules (120) are isolated and installed in each of the two module storage compartments; A flame-induced exhaust device comprising: two side frames (110b) forming a pack case (110) each having a flame exhaust port (111) at the top in each module storage compartment, a first flame-induced exhaust pipe (190a) provided on the outside of the pack case (110) to be connected to the flame exhaust port (111), and a second flame-induced exhaust pipe (190b) having a tip connected to the first flame-induced exhaust pipe (190a) and an end protruding to the outside of the vehicle body; A battery pack automatic fire extinguishing device comprising: a sprinkler head (151) and a fire detector (160) installed at predetermined intervals in a fire extinguishing liquid supply pipe (150) installed in a pipe passage (140) inside the battery pack (100) and a fire extinguishing liquid tank (170) and a pump (171) that pump and supply fire extinguishing liquid to the fire extinguishing liquid supply pipe (150) outside the battery pack (100), and a control unit (172) that controls the opening and closing of a valve (175) and the operation of a pump (171) by receiving a signal from a fire detector (160) installed in each module storage compartment; A fire spread prevention system for an electric vehicle, characterized by being composed of a flame induction exhaust device to release pressure and a battery pack automatic fire extinguishing device to extinguish the fire when a fire caused by the battery occurs in the electric vehicle.

10. In Paragraph 9, A module connection wiring cutoff device comprising a wiring cutoff control unit (184) that controls the wiring cutoff operation of each wiring cutoff device (182) by receiving a signal from a heat detection sensor (183) placed in each module storage compartment, wherein a wiring cutoff device (182) is installed at the contact point of a module connection wiring (181) and one end of a first bus bar (180a) to a third bus bar (180c) that connects the negative and positive electrodes of each battery module (120) in series; A fire spread prevention system for an electric vehicle characterized by further providing pressure release by flame discharge, extinguishing by an automatic fire extinguishing device, and electrical disconnection of the battery module by disconnecting the connecting wires to weaken the electrical explosion of the battery.

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