Battery heat dissipation and fire extinguishing system and vehicle

Abstract

The utility model provides a battery heat dissipation fire extinguishing system and a vehicle, the battery heat dissipation fire extinguishing system includes battery cell, liquid storage tank, diversion pipe, nozzle and thermosensitive plugging piece, liquid storage tank is used for storing cooling liquid, one end of diversion pipe is connected with liquid storage tank, the other end of diversion pipe is connected with nozzle, nozzle is arranged above battery cell, can spray cooling liquid to battery cell surface. The thermosensitive plugging piece is arranged in the flow guide pipe and is in interference fit with the flow guide pipe, cooling liquid in the flow guide pipe cannot flow to the spray head under the condition that the flow guide pipe is plugged, but the thermosensitive plugging piece is broken and the plugging effect on the flow guide pipe is invalid under the condition that a battery cell in the battery pack is thermally runaway, so that the cooling liquid in the flow guide pipe flows to the spray head; and then the spray head can spray cooling liquid to the surface of the battery cell to quickly extinguish and cool the thermal runaway battery cell, so that the thermal runaway battery cell is prevented from continuously diffusing to cause fire, explosion and the like of the battery pack, and the use safety of the battery pack is effectively protected.

Description

Technical Field

[0001] The utility model relates to the technical field of battery thermal control, and particularly relates to a battery heat dissipation and fire extinguishing system and a vehicle. Background Art

[0002] New energy vehicles have gradually become the key development object in the vehicle industry due to their advantages such as environmental protection and energy conservation, and are deeply favored by consumers. As the core component of new energy vehicles, the power battery pack provides power output for new energy vehicles. The charge and discharge performance of the power battery pack determines the driving ability and endurance of new energy vehicles, and the safety performance of the power battery pack determines the safety performance of new energy vehicles.

[0003] During the charge and discharge process of the power battery pack, its internal temperature will continuously rise, resulting in heat generation problems of the battery pack. In the case of overheating, the battery pack is prone to thermal runaway, leading to the battery pack catching fire or even exploding, seriously affecting the use safety of the vehicle. Summary of the Utility Model

[0004] In view of this, the utility model aims to provide a battery heat dissipation and fire extinguishing system and a vehicle to solve the problems in the prior art that the battery cells are prone to thermal runaway, resulting in the battery pack catching fire and exploding.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] The utility model provides a battery heat dissipation and fire extinguishing system, including battery cells, a liquid storage tank, a diversion pipe, a spray head and a thermal sealing member;

[0007] The liquid storage tank is used for storing coolant. One end of the diversion pipe is connected to the liquid storage tank, and the other end is connected to the spray head, and the spray head is arranged above the battery cells;

[0008] The thermal sealing member is arranged in the diversion pipe and is in interference fit with the diversion pipe.

[0009] Further, the thermal sealing member is arranged at the end of the diversion pipe close to the spray head.

[0010] Further, the thermal sealing member is a thermal glass tube, and the thermal glass tube is filled with a thermal expansion liquid.

[0011] Further, there are at least two battery cells, and the diversion pipe includes a common rail pipe and at least two drainage pipes;

[0012] One end of the common rail pipe is connected to the liquid storage tank, and the other end is connected to at least two drainage pipes, and the other end of each drainage pipe is connected to a spray head.

[0013] Further, it further includes a temperature sensor, which is connected to the liquid storage tank and is used to detect the temperature of the coolant in the liquid storage tank.

[0014] Further, it further includes a heater, which is connected to the liquid storage tank and is used to heat the coolant in the liquid storage tank.

[0015] Further, the liquid storage tank is connected to an air pump, and the battery heat dissipation and fire extinguishing system further includes a pressure sensor, which is connected to the liquid storage tank and is used to detect the pressure in the liquid storage tank.

[0016] Further, it further includes a check valve, which is connected between the air pump and the liquid storage tank and is used to prevent the coolant in the liquid storage tank from flowing back to the air pump.

[0017] Further, the liquid storage tank is the coolant tank in the vehicle cooling system.

[0018] The present utility model also provides a vehicle, which includes the battery heat dissipation and fire extinguishing system described in any one of the foregoing items.

[0019] Compared with the prior art, the battery heat dissipation and fire extinguishing system and the vehicle of the present utility model have the following advantages:

[0020] The battery heat dissipation and fire extinguishing system of the present utility model includes a battery cell, a liquid storage tank, a diversion pipe, a nozzle, and a thermal sealing member. The liquid storage tank is used to store coolant. One end of the diversion pipe is connected to the liquid storage tank, and the other end is connected to the nozzle and is used to deliver the coolant to the nozzle. The nozzle is arranged above the battery cell and can spray the coolant onto the surface of the battery cell. The thermal sealing member is arranged in the diversion pipe and is in interference fit with the diversion pipe. The thermal sealing member can block the diversion pipe. In the case where the diversion pipe is blocked, the coolant in the diversion pipe cannot flow to the nozzle, and thus the nozzle cannot spray the coolant onto the surface of the battery cell. However, in the case of thermal runaway of the battery cell in the battery pack, the thermal sealing member ruptures and its blocking effect fails, so that the coolant in the diversion pipe flows to the nozzle, and thus the nozzle can spray the coolant onto the surface of the battery cell to quickly extinguish the fire and reduce the temperature of the thermally runaway battery cell, avoiding the continuous spread of the thermally runaway battery cell and causing the battery pack to catch fire, explode, etc., thereby effectively protecting the use safety of the battery pack.

[0021] The vehicle and the above battery heat dissipation and fire extinguishing system have the same advantages as those of the prior art, and will not be elaborated here. Description of the Drawings

[0022] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0023] Figure 1 Schematic diagram of the battery heat dissipation and fire extinguishing system according to the embodiment of the present utility model.

[0024] Explanation of the reference numerals:

[0025] 1 - battery cell, 2 - liquid storage tank, 20 - coolant, 21 - liquid injection port, 3 - diversion pipe, 31 - common rail pipe, 32 - drainage pipe, 4 - spray head, 5 - thermal sealing member, 6 - temperature sensor, 7 - heater, 8 - air pump, 80 - intake pipe, 81 - check valve, 9 - pressure sensor. Detailed implementation manners

[0026] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the protection scope of the present utility model.

[0027] The terms "first", "second", etc. in the description and claims of the present utility model are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0028] It should be understood that the term "an embodiment" mentioned throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present utility model. Therefore, the phrase "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0029] Figure 1 Schematic diagram of a battery heat dissipation and fire extinguishing system according to an embodiment of the present utility model. The following will refer to Figure 1 and describe the present utility model in detail in combination with the embodiments.

[0030] Refer to Figure 1, the present utility model provides a battery heat dissipation and fire extinguishing system, which includes a battery cell 1, a liquid storage tank 2, a diversion pipe 3, a spray head 4 and a thermal sealing member 5; the liquid storage tank 2 is used for storing a coolant 20, one end of the diversion pipe 3 is connected to the liquid storage tank 2, and the other end is connected to the spray head 4, and the spray head 4 is arranged above the battery cell 1; the thermal sealing member 5 is arranged in the diversion pipe 3 and is in interference fit with the diversion pipe 3.

[0031] Specifically, the battery pack includes a battery cell 1. The battery cell 1 is the core component of the battery pack. The charging and discharging of the battery pack are essentially carried out by the battery cell 1 inside it. The battery pack usually includes multiple battery cells 1, and the multiple battery cells 1 are arranged in an orderly manner inside the battery pack to form the charging and discharging unit of the battery pack. Since a large amount of heat is generated during the charging and discharging process of the battery cell 1, the temperature inside the battery pack rises. An excessively high temperature environment is not conducive to the normal operation of the battery cell 1. Therefore, a liquid cooling plate is usually provided inside the battery pack to dissipate heat from the battery cell 1 to maintain the normal temperature inside the battery pack. However, in the case where the heat generation of the battery cell 1 is too high or the liquid cooling plate fails, the temperature inside the battery pack rises sharply, which easily leads to the problem of thermal runaway of the battery cell 1, and then causes the battery pack to catch fire, explode, etc., seriously affecting the use safety of the battery pack.

[0032] To avoid the occurrence of the above phenomena, the battery heat dissipation and fire extinguishing system of the embodiment of the present utility model further includes a liquid storage tank 2, a diversion pipe 3, a spray head 4 and a thermal sealing member 5. The liquid storage tank 2 is used for storing a coolant 20. The coolant 20 is a liquid with heat dissipation and fire extinguishing properties, which can be pure water or can be composed of ethylene glycol, anti-corrosion additives, anti-foam additives and water, etc. The type of the coolant 20 is not limited in this embodiment. The liquid storage tank 2 is used for storing the coolant 20. The liquid storage tank 2 can be processed from anti-corrosion materials, or the inner wall of the liquid storage tank 2 can be coated with an anti-corrosion film to avoid the corrosion of the liquid storage tank 2 caused by the coolant 20. A liquid injection port 21 is provided on the liquid storage tank 2. Through the liquid injection port 21, the coolant 20 can be injected into the liquid storage tank 2. A cover is connected to the liquid injection port 21 to cover the liquid injection port 21 after the injection of the coolant 20 is completed to avoid the leakage of the coolant 20. An observation window can be provided on at least one side wall of the liquid storage tank 2. The observation window is made of transparent glass. Through the observation window, the remaining amount of the coolant 20 in the liquid storage tank 2 can be observed, so that the personnel can replenish the liquid storage tank 2 in time. One end of the diversion pipe 3 is connected to the liquid storage tank 2, and the other end is connected to the spray head 4. The coolant 20 inside the liquid storage tank 2 can flow to the spray head 4 through the diversion pipe 3. The spray head 4 is arranged above the battery cell 1 and can spray the coolant 20 onto the surface of the battery cell 1, thereby realizing the rapid cooling of the battery cell 1. Multiple small holes can be provided on the surface of the spray head 4 close to the battery cell 1 to improve the uniformity when spraying the coolant 20.

[0033] It should be noted that when the battery cell 1 is operating normally or the temperature inside the battery pack is normal, the coolant 20 flowing from the diversion pipe 3 to the nozzle 4 is blocked by the thermal blocking member 5. The thermal blocking member 5 is disposed inside the diversion pipe 3 and has an interference fit with the diversion pipe 3. The interference fit causes there to be no gap between the thermal blocking member 5 and the diversion pipe 3, thereby blocking the diversion pipe 3 and preventing the coolant 20 inside the diversion pipe 3 from flowing to the nozzle 4. Subsequently, the nozzle 4 will not spray the coolant 20 onto the surface of the battery cell 1. The interference fit between the thermal blocking member 5 and the diversion pipe 3 can be achieved through an adhesive or an elastic material to ensure the reliability of the interference fit and prevent the leakage of the coolant 20 inside the diversion pipe 3. However, in the case of a thermal runaway of the battery cell 1 inside the battery pack, the thermal blocking member 5 will be ruptured. Generally, the operating temperature of the battery cell 1 does not exceed 150°C. If the temperature inside the battery pack is higher than 150°C, the battery cell 1 is extremely likely to have a thermal runaway problem, which may further cause the battery thermal management and fire extinguishing system to catch fire or explode. Therefore, a thermal blocking member 5 with a heat resistance temperature not exceeding 150°C can be selected. When the temperature inside the battery pack does not exceed 150°C, the thermal blocking member 5 is in a sound state and effectively blocks the diversion pipe 3, preventing the coolant 20 inside the diversion pipe 3 from flowing to the nozzle 4. However, when the temperature inside the battery pack exceeds 150°C, the thermal blocking member 5 ruptures, and the interference fit relationship between it and the diversion pipe 3 fails accordingly. The thermal blocking member 5 can no longer effectively block the diversion pipe 3, allowing the coolant 20 inside the diversion pipe 3 to flow to the nozzle 4. At this time, the nozzle 4 will spray the coolant 20 onto the surface of the battery cell 1, achieving rapid cooling of the battery cell 1 and preventing the continuously spreading thermal runaway battery cell 1 from causing the battery pack to catch fire or explode, thereby effectively protecting the safety of the battery pack during use.

[0034] In summary, the battery thermal management and fire extinguishing system of the present utility model includes a battery cell 1, a liquid storage tank 2, a diversion pipe 3, a nozzle 4, and a thermal blocking member 5. The liquid storage tank 2 is used to store the coolant 20. One end of the diversion pipe 3 is connected to the liquid storage tank 2, and the other end is connected to the nozzle 4 for delivering the coolant 20 to the nozzle 4. The nozzle 4 is disposed above the battery cell 1 and can spray the coolant 20 onto the surface of the battery cell 1. The thermal blocking member 5 is disposed inside the diversion pipe 3 and has an interference fit with the diversion pipe 3. The thermal blocking member 5 can block the diversion pipe 3. When the diversion pipe 3 is blocked, the coolant 20 inside the diversion pipe 3 cannot flow to the nozzle 4, and subsequently, the nozzle 4 cannot spray the coolant 20 onto the surface of the battery cell 1. However, in the case of a thermal runaway of the battery cell 1 inside the battery pack, the thermal blocking member ruptures, and the blocking effect of the thermal blocking member 5 on the diversion pipe 3 fails, allowing the coolant 20 inside the diversion pipe 3 to flow to the nozzle 4. Subsequently, the nozzle 4 can spray the coolant 20 onto the surface of the battery cell 1 to quickly extinguish the fire and cool down the thermally runaway battery cell 1, preventing the continuously spreading thermally runaway battery cell 1 from causing the battery pack to catch fire or explode, thereby effectively protecting the safety of the battery pack during use.

[0035] Further, referring to Figure 1, the thermal sealing member 5 is disposed at the end of the diversion tube 3 close to the nozzle 4.

[0036] Specifically, the thermal sealing member 5 is disposed at the end of the diversion tube 3 close to the nozzle 4. This position can maximize the amount of the coolant 20 stored in the diversion tube 3. At the same time, it can shorten the path of the coolant 20 in the diversion tube 3 flowing to the nozzle 4 after the thermal sealing member 5 fails, and thus shorten the time for the coolant 20 to flow to the nozzle 4. When a thermal runaway occurs in the battery cell 1 in the battery pack, causing the thermal sealing member 5 to rupture and fail, the coolant 20 in the diversion tube 3 quickly flows to the nozzle 4, and the coolant 20 is sprayed on the thermally runaway battery cell 1 through the nozzle 4, thereby improving the timeliness of extinguishing the fire and cooling the thermally runaway battery cell 1.

[0037] Furthermore, the thermal sealing member 5 is a thermosensitive glass tube, and the thermosensitive glass tube is filled with a thermal expansion liquid.

[0038] Specifically, the thermal sealing member 5 is a thermosensitive glass tube, and the thermosensitive glass tube is filled with a thermal expansion liquid. The thermal expansion of the liquid is caused by the decrease in the attraction between liquid molecules. The molecules of the liquid vibrate more violently due to the action of heat, increasing the average distance between the molecules, causing the volume of the entire liquid to increase and expand. The thermal expansion liquid in the embodiments of the present invention includes, but is not limited to, kerosene, ether, etc., and the specific type is not limited in this embodiment. The glass tube has good mechanical properties, thermal stability, and corrosion resistance, and will not chemically react with the thermal expansion liquid filled therein. However, at too high a temperature, the glass tube will still break, causing the thermal expansion liquid inside to leak out. The thermal expansion liquid filled in the thermosensitive glass tube expands when heated, squeezing the inner wall of the thermosensitive glass tube. When a thermal runaway occurs in the battery cell 1 in the battery pack, the extrusion force of the thermal expansion liquid on the inner wall of the thermosensitive glass tube is too large, causing the thermosensitive glass tube to break, so that the interference fit between the thermosensitive glass tube and the diversion tube 3 fails, and then the coolant 20 in the diversion tube 3 flows to the nozzle 4, and the nozzle 4 sprays the coolant 20 on the thermally runaway battery cell 1 to extinguish the fire and cool the thermally runaway battery cell 1. In the embodiments of the present invention, a glass tube with a breaking temperature of about 150 °C is selected to ensure the effectiveness of extinguishing the fire and cooling the thermally runaway battery cell 1. In some preferred embodiments, a glass tube with a wall thickness of 0.01 mm to 3 mm can be selected. It can be understood that if the wall thickness of the glass tube is too thick, it will be more difficult for the glass tube to break. Therefore, a glass tube with a wall thickness in the range of 0.01 mm to 3 mm is selected to ensure that the glass tube can break smoothly at high temperature, so that the coolant 20 in the diversion tube 3 can smoothly flow to the nozzle 4, and the coolant 20 is sprayed on the thermally runaway battery cell 1 through the nozzle 4 to achieve the extinguishing of the fire and cooling of the thermally runaway battery cell 1.

[0039] Furthermore, referring to Figure 1, there are at least two of the battery cells 1, and the flow guide pipe 3 includes a common rail pipe 31 and at least two drainage pipes 32; one end of the common rail pipe 31 is connected to the liquid storage tank 2, and the other end is connected to at least two of the drainage pipes 32, and the other end of each drainage pipe 32 is connected to a nozzle 4.

[0040] Specifically, there are at least two battery cells 1. In practical applications, multiple battery cells 1 are usually arranged in a battery pack, and the multiple battery cells 1 are arranged in an orderly manner to form the charge and discharge unit of the battery pack. The flow guide pipe 3 includes a common rail pipe 31 and at least two drainage pipes 32. One end of the common rail pipe 31 is connected to the liquid storage tank 2, and the other end is connected to at least two drainage pipes 32. The other end of each drainage pipe 32 is connected to a nozzle 4. The common rail pipe 31 transports the coolant 20 in the liquid storage tank 2 to each drainage pipe 32, and different drainage pipes 32 then transport the coolant 20 to the surfaces of different battery cells 1, thereby enabling simultaneous cooling of multiple battery cells 1 and preventing the spread of thermal runaway. In some preferred embodiments, the aperture of the common rail pipe 31 is set to be larger than that of the drainage pipe 32 to ensure that the coolant 20 can fully flow into each drainage pipe 32.

[0041] Furthermore, referring to Figure 1 , the battery heat dissipation and fire extinguishing system further includes a temperature sensor 6, and the temperature sensor 6 is connected to the liquid storage tank 2 for detecting the temperature of the coolant 20 in the liquid storage tank 2.

[0042] Specifically, the temperature sensor 6 is connected to the liquid storage tank 2, and the connection methods include but are not limited to adhesive connection, fastener assembly connection, etc. The specific connection method is not limited in this embodiment. The outer wall of the liquid storage tank 2 can also be provided with structures such as installation grooves, and the temperature sensor 6 is embedded in the installation groove, thereby improving the installation reliability of the temperature sensor 6. The temperature sensor 6 is used to detect the temperature of the coolant 20 in the liquid storage tank 2. When the battery pack is used in some relatively hot environments, the temperature of the coolant 20 in the liquid storage tank 2 may be relatively high, which is not conducive to extinguishing the fire and cooling the thermal runaway battery cell 1. At this time, an appropriate amount of low-temperature coolant 20 can be injected into the liquid storage tank 2 through the liquid injection port 21 to reduce the temperature of the coolant 20 in the liquid storage tank 2 and ensure the normal function of the coolant 20. In some preferred embodiments, a reminder device, such as a microphone, an indicator light, an electronic screen, etc., can be connected to the temperature sensor 6 to prompt the temperature detected by the temperature sensor 6, so as to facilitate personnel to timely understand the temperature situation of the coolant 20.

[0043] Furthermore, referring to Figure 1 , the battery heat dissipation and fire extinguishing system further includes a heater 7, and the heater 7 is connected to the liquid storage tank 2 for heating the coolant 20 in the liquid storage tank 2.

[0044] Specifically, if the battery pack is in a normal temperature or high temperature environment, the fluidity of the coolant 20 in the liquid storage tank 2 is relatively strong, and it can usually flow smoothly into the diversion pipe 3. If the battery pack is in a low temperature environment, the fluidity of the coolant 20 in the liquid storage tank 2 becomes poor, and even icing may occur. At this time, the coolant 20 in the liquid storage tank 2 cannot flow into the diversion pipe 3. To ensure the fluidity of the coolant 20 in a low temperature environment, the battery heat dissipation and fire extinguishing system of the embodiment of the present utility model further includes a heater 7. The heater 7 can be an electric heating pipe. The heater 7 is fixedly connected to the liquid storage tank 2 through a fastener. After being powered on, the heater 7 can heat the coolant 20 in the liquid storage tank 2, so as to maintain the normal function of the coolant 20 in the liquid storage tank 2 and avoid situations such as icing of the coolant 20. Of course, the temperature sensor 6 and the heater 7 can also be electrically connected to the vehicle control system. The temperature sensor 6 sends the temperature of the coolant 20 in the liquid storage tank 2 detected to the control system, and the control system judges whether to heat the coolant 20 in the liquid storage tank 2 based on this temperature situation by the heater 7 for the liquid storage tank 2.

[0045] Further, referring to Figure 1 , the liquid storage tank 2 is connected with an air pump 8. The battery heat dissipation and fire extinguishing system further includes a pressure sensor 9. The pressure sensor 9 is connected to the liquid storage tank 2 and is used to detect the pressure in the liquid storage tank 2.

[0046] Specifically, the liquid storage tank 2 can be a high-pressure container, which can withstand a relatively high internal pressure. The upper part inside the liquid storage tank 2 is gas, and the lower part is the coolant 20. The liquid storage tank 2 is connected with an air inlet pipe 80. The end of the air inlet pipe 80 is connected with an air pump 8. The air pump 8 presses high-pressure gas into the liquid storage tank 2 through the air inlet pipe 80, so that the liquid storage tank 2 has a relatively high air pressure. As the air pressure in the liquid storage tank 2 increases, the coolant 20 in the liquid storage tank 2 will be continuously pressed into the diversion pipe 3. By using air pressure to promote the coolant 20 in the liquid storage tank 2 to be pressed into the diversion pipe 3, the reliability of the flow of the coolant 20 can be further ensured. On this basis, the battery heat dissipation and fire extinguishing system further includes a pressure sensor 9. The pressure sensor 9 is connected to the liquid storage tank 2 and is also connected to the vehicle control system. The pressure sensor 9 is used to detect the pressure in the liquid storage tank 2 and feedback the pressure in the liquid storage tank 2 to the control system. When the pressure does not meet the preset requirements, the control system can control the air pump 8 to supplement air to the liquid storage tank 2 to ensure the stability of the air pressure in the liquid storage tank 2 and avoid the backflow of the coolant 20.

[0047] Further, referring to Figure 1 , the battery heat dissipation and fire extinguishing system further includes a check valve 81. The check valve 81 is connected between the air pump 8 and the liquid storage tank 2 and is used to prevent the coolant in the liquid storage tank 2 from flowing back to the air pump 8.

[0048] Specifically, the check valve 81 is specifically connected to the intake pipe 80 between the air pump 8 and the liquid storage tank 2. The check valve 81 has only one medium flow direction, which can ensure that the gas provided by the air pump 8 only flows into the liquid storage tank 2, and at the same time prevent the gas and coolant in the liquid storage tank 2 from flowing back to the air pump 8, thereby improving the output efficiency of the air pump 8. Of course, a check valve 81 can also be connected between the liquid injection port 21 of the liquid storage tank 2 and the tank body of the liquid storage tank 2 to prevent the coolant 20 in the liquid storage tank 2 from flowing back.

[0049] Furthermore, the liquid storage tank 2 is a coolant tank in a vehicle cooling system.

[0050] Specifically, in some embodiments, the coolant tank in the vehicle cooling system can directly serve as the liquid storage tank 2. The vehicle can be a pure electric vehicle or a hybrid vehicle equipped with a battery pack. The cooling system cools the motor and related heat-generating components during the operation of the motor. The cooling system generally consists of a pump, a coolant tank, cooling pipelines, etc. The coolant tank stores coolant, and the pump pumps the coolant in the coolant tank to the cooling pipelines. Then, the coolant flows along the cooling pipelines through the components with higher heat generation during the operation of the motor to achieve heat dissipation and temperature reduction of the power system. Among them, the coolant tank in the cooling system can be used as the liquid storage tank 2 in the battery heat dissipation and fire extinguishing system, which can not only reduce the number of components, save the occupied space of the battery heat dissipation and fire extinguishing system, but also help control the vehicle cost and achieve the lightweight design of the vehicle.

[0051] An embodiment of the present invention further provides a vehicle, including the battery heat dissipation and fire extinguishing system described in any one of the foregoing items.

[0052] Specifically, the vehicle is a new energy vehicle. The vehicle includes the battery heat dissipation and fire extinguishing system described in any one of the foregoing items. The battery heat dissipation and fire extinguishing system has high safety, can effectively prevent the phenomenon of thermal runaway of the battery cells, and thus improve the safety performance of the vehicle.

[0053] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or terminal device including the said element.

[0054] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery heat dissipation fire extinguishing system, characterized in that: Including battery cells, liquid storage tanks, flow guide tubes, nozzles, thermal sealing parts and temperature sensors; The liquid storage tank is used to store coolant, one end of the guide tube is connected to the liquid storage tank, and the other end is connected to the nozzle, and the nozzle is arranged above the battery cell; The heat-sensitive plugging member is arranged in the flow guide tube and has an interference fit with the flow guide tube; The temperature sensor is connected to the liquid storage tank and is used to detect the temperature of the coolant in the liquid storage tank.

2. The battery heat dissipation and fire extinguishing system according to claim 1, characterized in that: The heat-sensitive plugging member is arranged at the end of the flow guide pipe close to the nozzle.

3. The battery heat dissipation and fire extinguishing system according to claim 1, characterized in that: The thermosensitive sealing member is a thermosensitive glass tube, and the thermosensitive glass tube is filled with a thermal expansion liquid.

4. The battery heat dissipation and fire extinguishing system according to claim 1, characterized in that: There are at least two battery cells, and the flow guide pipe includes a common rail pipe and at least two flow guide pipes; One end of the common rail pipe is connected to the liquid storage tank, and the other end is connected to at least two drainage pipes, and the other end of each drainage pipe is connected to one of the nozzles.

5. The battery heat dissipation and fire extinguishing system according to claim 1, characterized in that: It also includes a heater, which is connected to the liquid storage tank and is used to heat the coolant in the liquid storage tank.

6. The battery heat dissipation and fire extinguishing system according to claim 1, characterized in that: The liquid storage tank is connected to an air pump, and the battery heat dissipation and fire extinguishing system further includes a pressure sensor, which is connected to the liquid storage tank and is used to detect the pressure in the liquid storage tank.

7. The battery heat dissipation and fire extinguishing system according to claim 6, characterized in that: A check valve is also included, which is connected between the air pump and the liquid storage tank and is used to prevent the coolant in the liquid storage tank from flowing back to the air pump.

8. The battery heat dissipation and fire extinguishing system according to claim 1, characterized in that: The liquid storage tank is a coolant tank in a vehicle cooling system.

9. A vehicle, characterized in that: A battery heat dissipation and fire extinguishing system comprising any one of claims 1 to 8.

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