Power battery protection system and vehicle

Abstract

The utility model belongs to the field of electric vehicle power devices, and particularly provides a power battery protection system and a vehicle. The battery protection system comprises a nitrogen generation module, a nitrogen outlet of the nitrogen generation module is connected with a nitrogen storage tank through a gas inlet pipeline, the nitrogen storage tank is connected with a nitrogen conveying path and a boosting gas path which are connected in parallel, the boosting gas path is connected with a fire extinguishing agent storage tank, and the fire extinguishing agent storage tank is connected with a fire extinguishing agent conveying pipeline. The power battery protection system is further provided with a valve device used for controlling one of the nitrogen conveying path and the boosting gas path to be switched on. The vehicle comprises the battery protection system. Nitrogen generated by the nitrogen generation module can be used as a boosting gas source to boost the fire extinguishing agent to enter the battery pack, the speed of the fire extinguishing agent entering the battery pack can be increased, the fire extinguishing agent can play a fire extinguishing role after entering the battery pack, and the defect that the nitrogen introduced into the battery pack through the nitrogen conveying path is difficult to actively extinguish fire is overcome. Therefore, the battery protection system integrates fire suppression and afterwards fire extinguishment.

Description

Technical Field

[0001] This utility model belongs to the field of electric vehicle power devices, and in particular relates to a power battery protection system and vehicle. Background Technology

[0002] With the continuous increase in the penetration rate of new energy vehicles, the safety of power batteries, as the core power source of these vehicles, has become a focus of industry attention. Thermal runaway in power batteries can lead to fires, causing personal injury and property damage.

[0003] In related technologies, utility model patent CN217961053U discloses a battery pack fire extinguishing system. This system includes a fire extinguishing device and a controller. The fire extinguishing device includes an extinguishing agent storage tank, a compressed gas storage tank, and nozzles. The compressed gas storage tank, extinguishing agent storage tank, and nozzles are connected in series on an extinguishing agent delivery pipe. The nozzles are used to spray extinguishing agent into the battery pack. When the internal temperature of the battery pack reaches the thermal runaway standard, the controller activates the fire extinguishing device, and the extinguishing agent stored in the extinguishing agent storage tank is sprayed out through the nozzles to cool and extinguish the fire inside the battery pack. Compressed gas in the compressed gas storage tank flows into the extinguishing agent storage tank to pressurize the extinguishing agent and propel it to the nozzles.

[0004] The key to the aforementioned patent lies in proactive fire suppression after the fire starts. However, with the increasing energy capacity and density of battery packs, it may be difficult to extinguish a fire in time once it starts, and safety still needs to be improved.

[0005] Utility model patent CN217908665U discloses a nitrogen protection system for a battery pack. This system includes a nitrogen separation module (i.e., a nitrogen generation module), a main controller, a nitrogen storage tank, a pressure / flow regulation module, and an oxygen / pressure control module. The nitrogen separation module can be connected to the vehicle's air compressor. The air compressor, acting as the air source, inputs high-pressure air at a certain pressure into the nitrogen separation module. The nitrogen separation module separates nitrogen and oxygen from the air, and the output nitrogen is connected to the nitrogen storage tank. The nitrogen storage tank can be connected to the battery pack via pipelines, and the qualified nitrogen output can be delivered to the battery pack through these pipelines. This system replaces the oxygen in the battery pack with high-purity nitrogen to block combustion conditions, thereby inhibiting combustion.

[0006] The key to the aforementioned patent lies in actively suppressing fire by controlling the oxygen content inside the battery pack to an extremely low level, thereby providing a protective effect against combustion. However, the electrolyte inside the battery pack decomposes upon heating, producing oxygen, which can still potentially lead to combustion. Simply introducing nitrogen into the battery pack is insufficient to achieve timely fire extinguishing, and the safety of power batteries still needs improvement. Utility Model Content

[0007] The purpose of this invention is to provide a power battery protection system to solve the technical problem of insufficient power battery safety in the prior art. Another purpose of this invention is to provide a vehicle to solve the same technical problem.

[0008] To achieve the above objectives, the technical solution of the power battery protection system provided by this utility model is as follows:

[0009] A power battery protection system includes a nitrogen generation module. The nitrogen outlet of the nitrogen generation module is connected to a nitrogen storage tank via an inlet pipe. The nitrogen storage tank is connected to a nitrogen supply line and a booster gas line in parallel. The nitrogen supply line is used to connect to the battery pack to input nitrogen into the battery pack. The booster gas line is connected to a fire extinguishing agent storage tank. A fire extinguishing agent delivery line is connected to the fire extinguishing agent storage tank. The fire extinguishing agent delivery line is used to connect to the battery pack to deliver fire extinguishing agent into the battery pack. The power battery protection system is also equipped with a valve device for selectively controlling the operation of either the nitrogen supply line or the booster gas line.

[0010] As a further improvement, the valve device includes a pressure-sensing solenoid valve connected to the nitrogen supply line and a fire-extinguishing solenoid valve connected to the booster gas line, so as to control the selective conduction of the nitrogen supply line and the booster gas line by controlling the opening and closing of the pressure-sensing solenoid valve and the booster gas line.

[0011] As a further improvement, the outlet connection of the nitrogen storage tank is equipped with a three-way connector, and the nitrogen supply line and the booster gas line are respectively connected to the other two ports of the three-way connector.

[0012] As a further improvement, the downstream ends of the extinguishing agent delivery line and the nitrogen delivery line are connected to a two-position three-way solenoid valve for connection to the battery pack via the two-position three-way solenoid valve.

[0013] As a further improvement, the nitrogen generation module includes a container cylinder with a partition inside, which divides the container cylinder into two chambers, each equipped with a molecular sieve. A gas passage connects the two chambers, with one chamber having an air inlet for connecting to a gas source and the other chamber having a nitrogen outlet.

[0014] This utility model belongs to a combination invention, and its beneficial effects are as follows: The power battery protection system of this utility model integrates active fire suppression and passive fire extinguishing functions. During normal vehicle operation, the nitrogen supply path can be opened by controlling the valve device. The nitrogen stored in the nitrogen storage tank and generated by the nitrogen generation module can be introduced into the battery pack through the nitrogen supply path, keeping the oxygen content in the battery pack at a low level to reduce the risk of battery pack fire. Once the battery pack accidentally catches fire, the nitrogen stored in the nitrogen storage tank and generated by the nitrogen generation module can be introduced into the fire extinguishing agent storage tank through the booster gas path by controlling the valve device. This increases the pressure in the fire extinguishing agent storage tank, propelling the fire extinguishing agent to be quickly delivered into the battery pack, thereby controlling the fire in the battery pack.

[0015] Compared with existing technologies, this utility model can use nitrogen generated by the nitrogen generation module as a booster gas source to help the fire extinguishing agent enter the battery pack, which can accelerate the speed at which the fire extinguishing agent enters the battery pack. After entering the battery pack, the fire extinguishing agent can play a role in extinguishing the fire, thus making up for the defect that the nitrogen introduced into the battery pack through the nitrogen supply line is difficult to actively extinguish the fire. This makes the battery protection system integrate fire suppression and post-fire extinguishing into one, and the two functions support each other, thereby improving the safety of the power battery.

[0016] To achieve the above objectives, the technical solution for the vehicle provided by this utility model is as follows:

[0017] A vehicle includes a battery pack, an air source, and a battery protection system. The battery protection system includes a nitrogen generation module. The nitrogen outlet of the nitrogen generation module is connected to a nitrogen storage tank via an air intake pipe. The nitrogen storage tank is connected to a nitrogen supply line and a booster air line in parallel. The nitrogen supply line is connected to the battery pack to input nitrogen into the battery pack. The booster air line is connected to a fire extinguishing agent storage tank. A fire extinguishing agent delivery line is connected to the fire extinguishing agent storage tank. The fire extinguishing agent delivery line is connected to the battery pack to deliver fire extinguishing agent into the battery pack. The battery protection system is also equipped with a valve device for selectively controlling the operation of either the nitrogen supply line or the booster air line.

[0018] As a further improvement, the valve device includes a pressure-sensing solenoid valve connected to the nitrogen supply line and a fire-extinguishing solenoid valve connected to the booster gas line, so as to control the selective conduction of the nitrogen supply line and the booster gas line by controlling the opening and closing of the pressure-sensing solenoid valve and the booster gas line.

[0019] As a further improvement, the outlet connection of the nitrogen storage tank is equipped with a three-way connector, and the nitrogen supply line and the booster gas line are respectively connected to the other two ports of the three-way connector.

[0020] As a further improvement, the downstream ends of the extinguishing agent delivery line and the nitrogen delivery line are connected to a two-position three-way solenoid valve, which is used to connect to the battery pack.

[0021] As a further improvement, the nitrogen generation module includes a container cylinder with a partition inside. The partition divides the container cylinder into two chambers, each equipped with a molecular sieve. A gas passage connects the two chambers. One chamber has an air inlet connected to the gas source, and the other chamber has a nitrogen outlet.

[0022] This utility model is an improved invention, and its beneficial effects are as follows: The battery protection system configured in this utility model integrates active fire suppression and passive fire extinguishing functions. During normal vehicle operation, the nitrogen supply path can be opened by controlling the valve device. The nitrogen stored in the nitrogen storage tank and generated by the nitrogen generation module can be introduced into the battery pack through the nitrogen supply path, keeping the oxygen content in the battery pack at a low level to reduce the risk of battery pack fire. Once the battery pack catches fire, the nitrogen stored in the nitrogen storage tank and generated by the nitrogen generation module can be introduced into the fire extinguishing agent storage tank through the booster gas path by controlling the valve device. This increases the pressure in the fire extinguishing agent storage tank, propelling the fire extinguishing agent to be quickly delivered into the battery pack, thereby controlling the fire in the battery pack.

[0023] Compared with existing technologies, this utility model can use nitrogen generated by the nitrogen generation module as a booster gas source to help the fire extinguishing agent enter the battery pack, which can accelerate the speed at which the fire extinguishing agent enters the battery pack. After entering the battery pack, the fire extinguishing agent can play a role in extinguishing the fire, thus making up for the defect that the nitrogen introduced into the battery pack through the nitrogen supply line is difficult to actively extinguish the fire. This makes the battery protection system integrate fire suppression and post-fire extinguishing into one, and the two functions support each other, thereby improving the safety of the power battery. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the structural principle of the power battery protection system implementation method in a vehicle.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100, Nitrogen gas supply line; 200, Propellant gas supply line; 300, Extinguishing agent delivery pipeline. Detailed Implementation

[0027] To improve the safety of power batteries, the basic technical concept of this utility model is to integrate a fire extinguishing device into the nitrogen protection system, so as to quickly introduce a fire extinguishing agent into the battery pack in the event of an accidental fire, thus integrating active suppression and passive fire extinguishing into the battery protection system.

[0028] Based on the above concept, the present invention will be further described in detail below with reference to some embodiments.

[0029] Specific implementation of the power battery protection system provided by this utility model:

[0030] like Figure 1 As shown, the power battery protection system includes a nitrogen generator module. The function of the nitrogen generator module is to separate nitrogen and oxygen from the air to produce the required nitrogen. At its most basic level, the nitrogen generator module should include an air inlet and a nitrogen outlet. The air inlet can be connected to the vehicle's air source, such as the vehicle's air compressor. Air with a certain pressure can enter the nitrogen generator module through the air inlet, and after separation by the nitrogen generator module, nitrogen is discharged from the nitrogen outlet. To better protect the nitrogen generator module, a dust filter is connected between the vehicle's air source and the nitrogen generator module. Dust and other impurities carried in the air can be filtered by the dust filter and then sent to the nitrogen generator module through the air inlet.

[0031] The nitrogen outlet is connected to a nitrogen storage tank via a pipeline. This pipeline can be defined as the inlet pipeline that supplies nitrogen to the nitrogen storage tank. The nitrogen generated by the nitrogen generation module can be stored in the nitrogen storage tank. The nitrogen discharged from the nitrogen storage tank can be divided into two paths. One path can send nitrogen into the battery pack to replace the air inside the battery pack with a high concentration of nitrogen, thereby reducing the oxygen content inside the battery pack and actively suppressing battery pack fires. The other path can serve as a propellant source to push the extinguishing agent in the extinguishing agent storage tank into the battery pack to control any fires in the battery pack.

[0032] Specifically, the nitrogen storage tank is connected to two parallel gas lines. Based on the above description, these two gas lines can be defined as a nitrogen supply line 100 and a booster gas line 200. When the battery protection system is applied to the vehicle, the nitrogen supply line 100 is connected to the battery pack, allowing nitrogen to be supplied into the battery pack. The booster gas line 200 is connected to a fire extinguishing agent storage tank, which stores a certain amount of fire extinguishing agent, such as perfluorohexanone or heptafluoropropane. A fire extinguishing agent delivery line 300 is connected to the fire extinguishing agent storage tank. When the battery protection system is applied to the vehicle, the fire extinguishing agent delivery line 300 is connected to the battery pack, allowing fire extinguishing agent to be supplied into the battery pack.

[0033] The battery protection system is also equipped with a valve device that allows selective operation of either the nitrogen supply path 100 or the booster gas path 200. When the nitrogen supply path 100 is open, nitrogen from the nitrogen storage tank enters the battery pack via this path, replacing the oxygen-rich air with high-purity nitrogen. When the booster gas path 200 is open, nitrogen from the nitrogen storage tank enters the fire extinguishing agent storage tank via this path, increasing the internal pressure and propelling the fire extinguishing agent from the storage tank into the battery pack.

[0034] As described above, the battery protection system has the functions of suppressing fire and extinguishing fire. During normal vehicle operation, the nitrogen supply line 100 is activated, allowing nitrogen from the nitrogen reservoir to enter the battery pack, reducing the oxygen content inside the battery pack and thus suppressing fire. In the event of an accidental fire in the battery pack, the booster gas line 200 is activated, allowing nitrogen from the nitrogen reservoir to enter the extinguishing agent storage tank. This increases the pressure within the extinguishing agent storage tank, propelling the extinguishing agent towards the battery pack to control the fire.

[0035] Regarding the aforementioned valve devices, in some embodiments, solenoid valves can be configured for the nitrogen supply line 100 and the booster gas line 200 respectively, so as to control the conduction of the gas lines by controlling the opening and closing of their respective solenoid valves. Specifically, the nitrogen supply line 100 is equipped with a pressure-detecting solenoid valve, which can detect the pressure inside the battery pack. When the internal pressure of the battery pack drops to a certain value, the pressure-reducing solenoid valve opens in time to replenish nitrogen into the battery pack, so that the inside of the battery pack is in a continuous positive pressure state. The booster gas line 200 is equipped with a fire-extinguishing solenoid valve, which can cut off the booster gas line 200 when closed. When the vehicle is running normally, the fire-extinguishing solenoid valve is closed, the booster gas line 200 is cut off, and the pressure-detecting solenoid valve can be opened as needed to input nitrogen into the battery pack. After the battery pack catches fire, the pressure-detecting solenoid valve closes, the fire-extinguishing solenoid valve opens, and the booster gas line 200 is opened to deliver nitrogen into the fire extinguishing agent storage tank.

[0036] In some other embodiments, the fire extinguishing solenoid valve may not be installed on the booster gas path 200. In this case, the booster gas path 200 and the nitrogen supply path 100 can be connected in the same solenoid directional valve so as to control the flow direction of nitrogen through the solenoid directional valve, that is, to control the conduction of the booster gas path 200 or the nitrogen supply path 100.

[0037] In some embodiments, when both the booster gas path 200 and the nitrogen supply path 100 are equipped with solenoid valves, such as Figure 1 As shown, the outlet of the nitrogen storage tank is connected to a T-junction, and the booster gas path 200 and the nitrogen delivery path 100 are respectively connected to the other two ports of this T-junction. In this case, only one nitrogen outlet needs to be reserved for the nitrogen storage tank, resulting in a simple structure. Of course, it should be noted that, in other embodiments, those skilled in the art will understand that two nitrogen outlets can also be reserved for the nitrogen storage tank, with the booster gas path 200 and the nitrogen delivery path 100 respectively connected to the two nitrogen outlet positions.

[0038] As a preferred embodiment, such as Figure 1As shown, the downstream ends of the extinguishing agent delivery pipeline 300 and the nitrogen delivery pipeline 100 are connected to a solenoid valve. This solenoid valve is a two-position three-way solenoid valve. Both the extinguishing agent delivery pipeline 300 and the nitrogen delivery pipeline 100 are connected to the battery pack through this two-position three-way solenoid valve. Specifically, it can be connected to the air inlet of the battery pack. In this case, the medium (nitrogen or extinguishing agent) introduced into the battery pack can be controlled by controlling the two-position three-way solenoid valve, and there is no need to install a valve on the extinguishing agent delivery pipeline 300.

[0039] However, it should be emphasized that in other embodiments, conventional tee connectors can also be used to connect the extinguishing agent delivery pipeline 300 and the nitrogen delivery pipeline 100 to the battery pack. In this case, a valve can be installed on the extinguishing agent delivery pipeline 300 to prevent the extinguishing agent from entering the battery pack when nitrogen is introduced into the battery pack.

[0040] In some implementations, the nitrogen generation module can be based on the pressure swing adsorption (PSA) principle. Compared to separation membranes, the molecular sieves used in PSA are less expensive, reducing the overall cost of the battery protection system. Specifically, the nitrogen generation module includes a housing cylinder with a partition inside, dividing the cylinder into two chambers, each containing a molecular sieve. A connecting gas path connects the two chambers. One chamber has an air inlet connected to a gas source, while the other has a nitrogen outlet. The nitrogen generation module contains two stages of molecular sieves in series. Air enters the first chamber through the air inlet, undergoes initial adsorption by the molecular sieve, then enters the second chamber through the connecting gas path, undergoes further adsorption by the molecular sieve, and is discharged through the nitrogen outlet, thus obtaining relatively pure nitrogen. Meanwhile, the two chambers share a partition as the enclosing plate, which makes the dimensions more compact and allows for a longer path for oxygen adsorption within a limited space, ensuring the purity of the produced nitrogen.

[0041] Regarding the connecting air passage, in some embodiments, such as Figure 1 As shown, a solid pipeline can be used to connect the two receiving cavities. Specifically, a pipeline can be used to connect the outlet above the first receiving cavity and the inlet below the second receiving cavity. Alternatively, in some embodiments, holes can be made in the partition plate, allowing the two receiving cavities to be connected through an air passage formed by the holes in the partition plate.

[0042] The air inlet of the nitrogen generator module can be connected to a booster solenoid valve via a three-way connector, which in turn connects to a dust filter, thus connecting to the vehicle's air supply. The relatively clean air filtered by the dust filter is pressurized by the booster solenoid valve and enters the nitrogen generator module. The other port of this three-way connector connects to a pressure relief and oxygen exhaust pipeline, which is equipped with a pressure relief solenoid valve. When the molecular sieve in the nitrogen generator module is saturated, the booster solenoid valve can be closed and the pressure relief solenoid valve opened, releasing the oxygen adsorbed by the molecular sieve and venting it through the pressure relief and oxygen exhaust pipeline. After a certain level of oxygen is exhausted, the pressure relief solenoid valve can be closed and the booster solenoid valve opened, restarting the next nitrogen generation cycle. To reduce the noise of oxygen exhaust, a muffler can be installed on the pressure relief and oxygen exhaust pipeline. By using a three-way connector, the air inlet also functions as an oxygen outlet, eliminating the need for a separate oxygen outlet for the nitrogen generator module. Furthermore, the intake and exhaust can share a single pipeline section, resulting in a more compact pipeline layout and easier installation on the vehicle.

[0043] To ensure that all nitrogen entering the battery pack is of acceptable quality, a gas detection module is installed on the nitrogen supply line 100. This module includes an oxygen sensor to detect whether the composition of the gas output from the nitrogen storage tank meets requirements. The nitrogen supply line 100 is connected to an exhaust gas line via a T-connector, and this exhaust gas line is equipped with an exhaust solenoid valve. If the gas detection module determines that the gas discharged from the nitrogen storage tank is acceptable (i.e., the oxygen content is low), it opens the solenoid valve connected to the battery pack and closes the exhaust solenoid valve, allowing the gas to enter the battery pack. If the gas detection module determines that the discharged gas is unacceptable (i.e., the oxygen content is high), it closes the solenoid valve connected to the battery pack and opens the exhaust solenoid valve to discharge the gas.

[0044] To increase the capacity of the vehicle's power battery, the battery system can connect N (N≥2) battery packs in series or parallel, and the same battery protection system can be connected to each battery pack through corresponding branch pipelines.

[0045] Understandably, the battery protection system is also equipped with a controller, which controls the opening and closing of each solenoid valve to keep the battery protection system in a suitable state.

[0046] In addition, the nitrogen generator module, various valves, and some pipelines (see reference) Figure 1 The components inside the dashed box can be encapsulated in a separate enclosure, with interfaces reserved at appropriate locations on the enclosure to facilitate connection to battery packs, nitrogen storage tanks, controllers, etc.

[0047] Specific implementation of the vehicle in this utility model:

[0048] The vehicle includes an air source, a battery pack, and a battery protection system. The structure and principle of the battery protection system are the same as those of the power battery protection system described above, and will not be described in detail here.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A power battery protection system, characterized in that, The system includes a nitrogen generation module, whose nitrogen outlet is connected to a nitrogen storage tank via an inlet pipe. The nitrogen storage tank is connected to a parallel nitrogen supply line and a booster gas line. The nitrogen supply line is used to connect to the battery pack to supply nitrogen to the battery pack. The booster gas line is connected to a fire extinguishing agent storage tank. A fire extinguishing agent delivery line is connected to the fire extinguishing agent storage tank. The fire extinguishing agent delivery line is used to connect to the battery pack to supply fire extinguishing agent to the battery pack. The power battery protection system is also equipped with a valve device for selectively controlling the operation of either the nitrogen supply line or the booster gas line.

2. The power battery protection system according to claim 1, characterized in that, The valve device includes a pressure-sensing solenoid valve connected to the nitrogen supply line and a fire-extinguishing solenoid valve connected to the booster gas line, so as to control the selective conduction of the nitrogen supply line and the booster gas line by controlling the opening and closing of the pressure-sensing solenoid valve and the booster gas line.

3. The power battery protection system according to claim 2, characterized in that, The outlet of the nitrogen storage tank is connected to a three-way connector, and the nitrogen supply line and the booster gas line are respectively connected to the other two ports of the three-way connector.

4. The power battery protection system according to claim 1, 2, or 3, characterized in that, The downstream ends of the extinguishing agent delivery pipeline and the nitrogen delivery pipeline are connected to a two-position three-way solenoid valve for connecting to the battery pack via the two-position three-way solenoid valve.

5. The power battery protection system according to claim 1, 2, or 3, characterized in that, The nitrogen generation module includes a container cylinder with a partition inside, which divides the container cylinder into two chambers, each equipped with a molecular sieve. A gas passage connects the two chambers. One chamber has an air inlet for connecting to a gas source, and the other chamber has a nitrogen outlet.

6. A vehicle comprising a battery pack, a gas source, and a battery protection system, characterized in that, The battery protection system includes a nitrogen generation module. The nitrogen outlet of the nitrogen generation module is connected to a nitrogen storage tank via an inlet pipe. The nitrogen storage tank is connected to a parallel nitrogen supply line and a booster gas line. The nitrogen supply line is connected to the battery pack to input nitrogen into the battery pack. The booster gas line is connected to a fire extinguishing agent storage tank. A fire extinguishing agent delivery line is connected to the fire extinguishing agent storage tank. The fire extinguishing agent delivery line is connected to the battery pack to deliver fire extinguishing agent into the battery pack. The battery protection system is also equipped with a valve device for selectively controlling the operation of either the nitrogen supply line or the booster gas line.

7. The vehicle according to claim 6, characterized in that, The valve device includes a pressure-sensing solenoid valve connected to the nitrogen supply line and a fire-extinguishing solenoid valve connected to the booster gas line, so as to control the selective conduction of the nitrogen supply line and the booster gas line by controlling the opening and closing of the pressure-sensing solenoid valve and the booster gas line.

8. The vehicle according to claim 7, characterized in that, The outlet of the nitrogen storage tank is connected to a three-way connector, and the nitrogen supply line and the booster gas line are respectively connected to the other two ports of the three-way connector.

9. The vehicle according to claim 6, 7, or 8, characterized in that, The downstream ends of the extinguishing agent delivery pipeline and the nitrogen delivery pipeline are connected to a two-position three-way solenoid valve, which is used to connect to the battery pack.

10. The vehicle according to claim 6, 7, or 8, characterized in that, The nitrogen generation module includes a container cylinder with a partition inside, which divides the container cylinder into two chambers, each equipped with a molecular sieve. A gas passage connects the two chambers, with one chamber having an air inlet connected to the gas source and the other chamber having a nitrogen outlet.

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