Acoustic wave resonance standing wave-based battery pack aerosol fire extinguishing permeation system

Abstract

The invention discloses a battery pack aerosol fire extinguishing permeation system based on sound wave resonance standing waves, which is provided with a standing wave chamber, a plurality of ultrasonic transducers are uniformly distributed on the outer wall of an energy-gathering paraboloid of the standing wave chamber, electric energy is converted into sound energy through the ultrasonic transducers, a standing wave field is formed, and the sound wave resonance standing waves are formed. The focus of the energy-gathering paraboloid is located between the surface of the energy-gathering paraboloid and the outlet, so that acoustic radiation force in the direction of the outlet can be formed, aerosol is driven to directionally accelerate towards the outlet, finally, the aerosol is sprayed outwards from the outlet, and directional driving of an ultrasonic standing wave field is achieved. According to the invention, the change from passive diffusion to active acoustic migration is realized through directional driving of an ultrasonic standing wave field, so that the response time is shortened, and aerosol can quickly reach a fire source.

Description

Technical Field

[0001] The present invention relates to the field of new energy battery safety technology, and in particular to a battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing waves. Background Art

[0002] With the widespread use of new energy batteries (such as lithium-ion batteries), the risk of thermal runaway fires is becoming increasingly prominent. In scenarios such as electric vehicles and energy storage power stations, battery packs are typically integrated in a tightly stacked manner (such as square shells, cylinders, and soft packs), with gaps between cells as small as 0.1-0.5mm. To prevent battery fires from causing loss of life and property to users, prevention and fire extinguishing systems are usually implemented. Traditional aerosol fire extinguishing systems use pressure-jet aerosol particles and rely on thermal airflow to drive the aerosol diffusion, ultimately achieving the fire extinguishing effect.

[0003] However, this aerosol fire extinguishing method relies on pressure injection. Excessive pressure will pierce the battery casing, causing electrolyte leakage or thermal runaway diffusion. If the pressure is too low, the ejected aerosol particles can only rely on the hot air flow to drive the aerosol diffusion, which has a slow response speed and is difficult to prevent the spread of fire. Therefore, a battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing waves is needed to improve the diffusion effect of aerosol particles. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing waves.

[0005] The present invention provides a battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing waves, comprising:

[0006] A dynamic control unit, used for receiving fire signals and generating dynamic frequencies;

[0007] The release unit has two outlets for releasing compressed gas and aerosol respectively;

[0008] The standing wave unit includes a standing wave generation module and a nozzle module. The nozzle module includes a standing wave chamber. One end of the standing wave chamber is connected to the discharge port through a double air inlet channel. The other end of the standing wave chamber is provided with a contraction section. The contraction section has an outlet away from the end of the standing wave chamber. The standing wave chamber has an energy-focusing parabola. The focus of the energy-focusing parabola is located between the outlet and the energy-focusing parabola. The standing wave generation module includes a transducer controller for receiving the dynamic frequency, and a plurality of ultrasonic transducers evenly distributed on the outer wall of the energy-focusing parabola.

[0009] According to the technical solution provided in the embodiment of the present application, the dynamic control unit includes a battery structure identification module and a PLC control module. The battery structure identification module is used to photograph and process abnormal batteries to obtain the packaging type of the abnormal batteries and the characteristic parameters corresponding to the packaging type. The PLC control module is used to receive the fire signal, the packaging type and the corresponding characteristic parameters, and then generate the dynamic frequency through the frequency control submodule.

[0010] According to the technical solution provided in the embodiment of the present application, the battery structure identification module includes a laser rangefinder, an industrial camera and an edge computing chip. The edge computing chip processes the pictures taken by the industrial camera based on the YOLOv5 algorithm, identifies and outputs the packaging type of abnormal batteries. The laser rangefinder is used to measure the characteristic parameters corresponding to each packaging type.

[0011] According to the technical solution provided in the embodiment of the present application, the release unit includes a raw material module, and the raw material module includes two pressure containers, which contain the compressed gas and the aerosol. Each of the pressure containers is connected to a gas-liquid two-phase pipeline, and the two gas-liquid two-phase pipelines have the discharge port away from the end of the pressure container.

[0012] According to the technical solution provided in the embodiment of the present application, the dual air inlet duct is composed of a coaxially arranged first sleeve and a second sleeve, the first sleeve is arranged outside the second sleeve, and the second sleeve has a second channel for conveying the aerosol inside, and a first channel for conveying the compressed gas is provided between the first sleeve and the second sleeve, and the first channel and the second channel are respectively connected to the corresponding pressure vessel through a gas-liquid two-phase pipeline.

[0013] According to the technical solution provided in the embodiment of the present application, a crushing module is provided on each of the two gas-liquid two-phase pipelines, and the crushing module is used to crush particle agglomerates inside the gas-liquid two-phase pipelines.

[0014] According to the technical solution provided in the embodiment of the present application, a proportional control module is provided on each of the two gas-liquid two-phase pipelines, and the proportional control module is used to adjust the ratio of the compressed gas and the aerosol. The volume ratio of the compressed gas and the aerosol is 1:4 to 5.

[0015] According to the technical solution provided in the embodiment of the present application, the contraction angle of the contraction section is 10 to 15 degrees.

[0016] According to the technical solution provided in the embodiment of the present application, a resonator is provided inside the standing wave chamber.

[0017] According to the technical solution provided in the embodiment of the present application, the aerosol is a nano-SiO2 aerosol whose surface has been modified with trimethylsilane, and the particle size is 1-5 μm.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] First, the present invention sets up a standing wave chamber, and evenly arranges a number of ultrasonic transducers on the outer wall of the energy-focusing parabola of the standing wave chamber. The ultrasonic transducers convert electrical energy into sound energy to form a standing wave field. Because the focus of the energy-focusing parabola is located between its surface and the outlet, an acoustic radiation force is formed along the outlet direction, which drives the aerosol to accelerate toward the outlet and finally ejected outward from the outlet, thereby realizing directional driving of the ultrasonic standing wave field. Compared with the traditional technology, the aerosol only relies on the hot air flow to drive the aerosol diffusion, resulting in a long fire extinguishing response time. The present invention realizes the change from "passive diffusion" to "active acoustic migration" through directional driving of the ultrasonic standing wave field, which not only shortens the response time, but also enables the aerosol to quickly reach the fire source. In addition, compared with the traditional technology that uses high-pressure injection to improve the response speed, the injection pressure caused by the acoustic radiation force drive of the present invention is lower, which effectively solves the problem that high-pressure injection easily pierces the battery casing, causing electrolyte leakage or thermal runaway diffusion.

[0020] Secondly, a battery pattern recognition module is set up, and the characteristic parameters of the battery are measured by a laser rangefinder. When the ultrasonic frequency and the characteristic parameters satisfy f=nv / (2x) (f is the ultrasonic frequency, n is the resonance order, v is the sound speed, and x is the characteristic parameter), the standing wave field generates an acoustic radiation force that can drive the aerogel particles to break through the viscous resistance and penetrate into the submillimeter gap at a directional migration speed (0.5-1.2m / s). Compared with the traditional 20% submillimeter gap coverage rate, the submillimeter gap coverage rate of the present invention is 80%, which greatly improves the coverage effect, thereby greatly improving the fire extinguishing effect. Furthermore, the characteristic parameter x includes the planar gap d of the square shell battery, the arc gap arc length L of the cylindrical battery, and the dynamic deformation thickness Δh of the soft-pack battery, which is convenient for extinguishing fires for batteries of different packaging types, and realizes multi-structure compatibility and full-scene adaptation capabilities;

[0021] Finally, the acoustic wave characteristics of the standing wave field can effectively inhibit aerosol agglomeration and avoid the risk of blockage at the outlet; hydrophobic aerosol can form a barrier to shield water vapor, oxygen and other substances, thereby avoiding electrochemical corrosion.

[0022] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0024] Figure 1 A system block diagram of a battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing waves provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of the structure of a battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing waves provided in an embodiment of the present application;

[0026] Figure 3 A schematic structural diagram of a nozzle module in a battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing waves provided in an embodiment of the present application;

[0027] Figure 4 A schematic diagram of the installation structure of an elastic insulating layer in a battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing waves provided in an embodiment of the present application;

[0028] Figure 5 A schematic diagram of the installation structure of a gas-liquid two-phase pipeline and a dual air inlet duct in a battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing waves provided in an embodiment of the present application.

[0029] Numbers in the figure: 1. Dynamic control unit; 11. PLC control module; 12. Laser rangefinder; 13. Industrial camera; 2. Release unit; 21. Pressure vessel; 22. Aerosol; 23. Compressed gas; 24. Solenoid valve; 25. Gas-liquid two-phase pipeline; 26. Mass flow meter; 3. Standing wave unit; 31. Transducer controller; 32. Ultrasonic transducer; 33. Elastic insulation layer; 34. Nozzle module; 35. Double air inlet; 36. Standing wave chamber; 37. Energy-focusing parabola; 38. Contraction section; 39. Resonator; 4. Abnormal battery. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0031] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] Please refer to Figures 1 to 5 , an embodiment of the present invention provides a battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing wave, comprising:

[0033] A dynamic control unit 1 is used to receive a fire signal and generate a dynamic frequency;

[0034] The release unit 2 has two outlets for releasing compressed gas 23 and aerosol 22 respectively;

[0035] The standing wave unit 3 includes a standing wave generation module and a nozzle module 34. The nozzle module 34 includes a standing wave chamber 36. One end of the standing wave chamber 36 is connected to the discharge port through a double air inlet 35. The other end of the standing wave chamber 36 is provided with a contraction section 38. The contraction section 38 has an outlet away from the end of the standing wave chamber 36. The standing wave chamber 36 has an energy-focusing parabola 37. The focus of the energy-focusing parabola 37 is located between the outlet and the energy-focusing parabola 37. The standing wave generation module includes a transducer controller 31 for receiving dynamic frequency, and a plurality of ultrasonic transducers 32 evenly distributed on the outer wall of the energy-focusing parabola 37.

[0036] The present invention provides a standing wave chamber 36 and evenly distributes a number of ultrasonic transducers 32 on the outer wall of the focusing parabola 37 of the standing wave chamber 36. The ultrasonic transducers 32 convert electrical energy into acoustic energy, forming a standing wave field. Because the focus of the focusing parabola 37 is located between its surface and the outlet, an acoustic radiation force is generated in the direction of the outlet, driving the aerosol 22 and compressed gas 23 to accelerate in a direction toward the outlet, and finally ejected outward from the outlet, realizing the directional drive function of the ultrasonic standing wave field. Compared with the traditional technology, the aerosol 22 relies solely on the thermal airflow to drive the aerosol 22 to diffuse, resulting in a longer fire extinguishing response time. The present invention achieves a change from "passive diffusion" to "active acoustic migration" through the directional drive of the ultrasonic standing wave field, greatly shortening the response time and enabling the aerosol 22 to quickly reach the fire source. In addition, compared with the traditional technology that uses high-pressure injection to improve the response speed, the injection pressure caused by the acoustic radiation force drive of the present invention is lower, effectively solving the problem that high-pressure injection can easily pierce the battery casing, causing electrolyte leakage or thermal runaway diffusion.

[0037] In some embodiments, an elastic insulating layer 33 is mounted on the outer wall of the standing wave chamber 36, and each ultrasonic transducer 32 is mounted on the elastic insulating layer 33. Figure 4 As shown, the elastic insulating layer 33 is prevented from playing the role of buffering and insulation. On the one hand, it prevents multiple ultrasonic transducers 32 from forming an electrical connection with the outer wall of the standing wave chamber 36. On the other hand, it prevents the ultrasonic transducers 32 from directly contacting the outer wall of the standing wave chamber 36, and the generated sound waves from causing the outer wall of the standing wave chamber 36 to vibrate and break.

[0038] In some embodiments, the dynamic control unit 1 includes a battery structure identification module and a PLC control module 11. The battery structure identification module is used to photograph and process the abnormal battery 4, obtain the packaging type of the abnormal battery 4, and the characteristic parameters corresponding to the packaging type. The PLC control module 11 is used to receive the fire signal, the packaging type and the corresponding characteristic parameters, and then generate the dynamic frequency through the frequency control submodule.

[0039] Package types include square shell, cylindrical and soft package, among which:

[0040] The characteristic parameter corresponding to the prismatic shell is the plane gap d, which is the reserved gap between the battery shell and the internal battery cells or structural parts. Its function is to buffer the pressure of battery expansion on the shell, prevent structural deformation or cracking, and provide a channel for heat dissipation.

[0041] The characteristic parameter corresponding to the cylindrical type is the arc length L, which is the arc length between adjacent limiting structures (such as arc plates). The limiting structures (such as arc plates) are spaced along the circumference of the cylinder. Their arc surfaces contact the side walls of the battery, providing support and forming a heat dissipation duct through the gap.

[0042] The characteristic parameter corresponding to the soft-pack type is the dynamic deformation thickness Δh, which is the elastic deformation characteristic of the aluminum-plastic film shell when the internal pressure changes (such as gas production and expansion).

[0043] Among them, the frequency control submodule can directly output the corresponding dynamic frequency based on the acquired characteristic parameters according to the preset characteristic parameter-dynamic frequency database;

[0044] It should be noted that the above dynamic frequency can be calculated using the first formula, which is as follows:

[0045] f=nv / (2x)

[0046] Where f is the dynamic frequency, n is the resonance order, in kHz; v is the speed of sound, in m / s; x is the characteristic parameter (including the plane gap d of the square shell battery, the arc length L of the arc gap of the cylindrical battery, and the dynamic deformation thickness Δh of the soft pack battery), in mm.

[0047] Further optionally, a finite element simulation method may be used to establish a characteristic parameter-frequency mapping relationship, thereby reading the corresponding dynamic frequency according to the characteristic parameter.

[0048] In some embodiments, the battery structure identification module includes a laser rangefinder 12, an industrial camera 13 and an edge computing chip. The edge computing chip processes the pictures taken by the industrial camera 13 based on the YOLOv5 algorithm, identifies and outputs the packaging type of the abnormal battery 4. The laser rangefinder 12 is used to measure the characteristic parameters corresponding to each packaging type.

[0049] refer to Figure 1 and Figure 2 As shown, YOLOv5 has high accuracy in standard data sets and specific fields, and can accurately identify the abnormal battery 4 shape, and then output the corresponding packaging type. By setting multiple groups of laser rangefinders 12 to emit lasers and analyze the reflected signals to determine the target distance, the corresponding characteristic parameters are measured, such as the characteristic parameters of the soft-pack battery (dynamic deformation thickness Δh). The laser rangefinder 12 measures the initial distance and obtains the latest distance after deformation occurs. By calculating the difference between the initial distance and the current distance, the dynamic deformation thickness Δh can be obtained. Similarly, the reserved gap d of the square shell battery and the arc length L of the arc gap of the cylindrical battery can be obtained.

[0050] In some embodiments, the release unit 2 includes a raw material module, which includes two pressure vessels 21. The two pressure vessels 21 contain compressed gas 23 and aerosol 22. Each pressure vessel 21 is connected to a gas-liquid two-phase pipeline 25. The two gas-liquid two-phase pipelines 25 have a discharge port at the end away from the pressure vessel 21.

[0051] like Figure 2 As shown, this is the basic function of the glue release unit 2, which stores the compressed gas 23 and the aerosol 22 in the pressure container 21, and provides an initial driving force through the pressure in the pressure container 21 to transport the compressed gas 23 and the aerosol 22 to the discharge port, and then send the two into the nozzle module 34.

[0052] In some embodiments, the dual air inlet 35 is composed of a coaxially arranged first sleeve and a second sleeve, the first sleeve is arranged outside the second sleeve, the second sleeve has a second channel for conveying aerosol 22 inside, and a first channel for conveying compressed gas 23 is provided between the first sleeve and the second sleeve, and the first channel and the second channel are respectively connected to the corresponding pressure vessel 21 through a gas-liquid two-phase pipeline 25.

[0053] refer to Figure 3 As shown, the second channel with a circular cross section and the first channel with an annular cross section are coaxially arranged, thus forming a coaxial annular flow field, which can effectively disperse and mix the particles, and the particle concentration uniformity is ≥95%. Optionally, refer to Figure 5 As shown, one gas-liquid two-phase pipeline 25 passes through the inside of another gas-liquid two-phase pipeline 25 to achieve the purpose of communicating with the dual air inlet ducts 35.

[0054] In some embodiments, both gas-liquid two-phase pipelines 25 are provided with a crushing module, which is used to crush particle agglomerates inside the gas-liquid two-phase pipelines 25 .

[0055] refer to Figure 1 and Figure 2As shown, the crushing module can use an electromagnetic valve 24, which periodically outputs pressure pulses of 50-100 Hz and an amplitude of 0.2 MPa, which can effectively crush particle agglomerates and reduce the critical agglomeration size from 50 μm to 10 μm, avoiding the risk of micropore blockage and improving the system pressure stability; further, the electromagnetic valve 24 can also serve as a valve body, sealing the pressure vessel 21 through the valve core before extinguishing the fire, to prevent leakage of compressed gas 23 or aerosol 22.

[0056] In some embodiments, both gas-liquid two-phase pipelines 25 are provided with a proportional control module, which is used to adjust the ratio of the compressed gas 23 and the aerosol 22. The volume ratio of the compressed gas 23 and the aerosol 22 is 1:4.

[0057] refer to Figure 1 and Figure 2 As shown, the proportional control module can use a mass flow meter 26 to adjust the ratio of the compressed gas 23 and the aerosol 22 in real time. The optimal working condition is that the volume ratio of the compressed gas 23 and the aerosol 22 is 1:4, at which time the particle momentum flux reaches 0.8 kg / (m 2 ·s), ensuring that it matches the sound wave vibration energy.

[0058] In some embodiments, the converging section 38 has a converging angle of 15 degrees.

[0059] Among them, reference Figure 4 As shown, the contraction section 38 has a contraction angle α. In this embodiment, the contraction section 38 is used to achieve synergistic enhancement of acoustic energy and kinetic energy, focusing the acoustic wave force. The contraction angle is optimized through CFD simulation. When the contraction angle α is 15 degrees, the sound speed is 343 m / s, and the air flow speed is 60 m / s, a subsonic flow field with a Mach number of 0.17 is formed, avoiding the generation of shock waves and ensuring efficient transmission of acoustic energy to the particles. Furthermore, the inner wall of the standing wave chamber 36 is coated with a 2 mm thick acoustic matching layer, such as a polyurethane elastomer with an acoustic impedance of 1.2×10 6 kg / (m 2 ·s), which can effectively reduce the sound wave reflection loss.

[0060] In some embodiments, a resonator 39 is disposed inside the standing wave chamber 36 .

[0061] Among them, high-frequency standing waves are stable fluctuation patterns formed by multiple reflections and superpositions of sound waves in a limited space (such as a pipe or cavity), which are manifested as alternating distributions of maximum and minimum sound pressure values ​​at a specific frequency. When the external excitation frequency matches the natural frequency of the space, the standing wave energy is concentrated to form modal clutter, which leads to uneven distribution of sound field energy and signal distortion.

[0062] By designing the resonator 39 to a specific resonant frequency that matches the target standing wave frequency, when the sound wave passes through, the resonator 39 generates maximum impedance at the matching frequency, converting the sound energy into mechanical vibration energy or heat energy, thereby eliminating high-frequency standing wave modal clutter and improving the purity of the sound field. Optionally, refer to Figure 4 As shown, the resonator 39 is a blind hole provided on the energy-concentrating parabola 37 .

[0063] In some embodiments, the aerosol 22 is a nano-SiO2 aerosol whose surface has been modified with trimethylsilane and has a particle size of 1-5 μm;

[0064] Among them, through trimethylsilane modification, -C(CH3)3 groups are introduced on the surface of nano-SiO2 aerosol, so that the contact angle is changed from hydrophilic (<30°) to strongly hydrophobic (150°±5°), and the surface energy is reduced to below 15mN / m, ensuring that the aerosol 22 flows stably in the gas-liquid two-phase flow pipeline and the aerosol 22 particles are evenly dispersed. On the other hand, the hydrophobic property of the aerosol 22 forms a barrier to shield substances such as water vapor and oxygen, thereby avoiding electrochemical corrosion.

[0065] In this specification, the terms "connect," "install," and "fix" should be understood broadly. For example, "connect" can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0066] Throughout this specification, terms such as "one embodiment" or "some embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0067] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery pack aerosol fire extinguishing penetration system based on acoustic resonance standing wave, characterized in that: include: A dynamic control unit (1) is used to receive a fire signal and generate a dynamic frequency; The release unit (2) has two discharge ports for respectively releasing compressed gas (23) and aerosol (22) outwards; The standing wave unit (3) comprises a standing wave generating module and a nozzle module (34), wherein the nozzle module (34) comprises a standing wave chamber (36), wherein one end of the standing wave chamber (36) is connected to the discharge port via a double air inlet duct (35), and the other end of the standing wave chamber (36) is provided with a contraction section (38), wherein the contraction section (38) has an outlet away from the end of the standing wave chamber (36), and the standing wave chamber (36) has an energy-gathering parabola (37), wherein the focus of the energy-gathering parabola (37) is located between the outlet and the energy-gathering parabola (37), and the standing wave generating module comprises a transducer controller (31) for receiving the dynamic frequency, and a plurality of ultrasonic transducers (32) uniformly arranged on the outer wall of the energy-gathering parabola (37).

2. The battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing wave according to claim 1 is characterized in that: The dynamic control unit (1) comprises a battery structure identification module and a PLC control module (11). The battery structure identification module is used to photograph and process abnormal batteries (4) to obtain the packaging type of the abnormal batteries (4) and characteristic parameters corresponding to the packaging type. The PLC control module (11) is used to receive the fire signal, the packaging type and the corresponding characteristic parameters, and then generate the dynamic frequency through processing by a frequency control submodule.

3. The battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing wave according to claim 2 is characterized in that: The battery structure identification module includes a laser rangefinder (12), an industrial camera (13) and an edge computing chip. The edge computing chip processes images taken by the industrial camera (13) based on the YOLOv5 algorithm to identify and output the packaging type of the abnormal battery (4). The laser rangefinder (12) is used to measure the characteristic parameters corresponding to each packaging type.

4. The battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing wave according to claim 1 is characterized in that: The release unit (2) includes a raw material module, and the raw material module includes two pressure containers (21). The two pressure containers (21) contain the compressed gas (23) and the aerosol (22). Each of the pressure containers (21) is connected to a gas-liquid two-phase pipeline (25), and the two gas-liquid two-phase pipelines (25) have the discharge port at the end away from the pressure container (21).

5. The battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing wave according to claim 4 is characterized in that: The dual air inlet channel (35) is composed of a first sleeve and a second sleeve arranged coaxially, wherein the first sleeve is sleeved outside the second sleeve, and the interior of the second sleeve has a second channel for conveying the aerosol (22), and a first channel for conveying the compressed gas (23) is provided between the first sleeve and the second sleeve, and the first channel and the second channel are respectively connected to the corresponding pressure container (21) through a gas-liquid two-phase pipeline (25).

6. The battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing wave according to claim 4 is characterized in that: The two gas-liquid two-phase pipelines (25) are both provided with a crushing module, and the crushing module is used to crush particle agglomerates inside the gas-liquid two-phase pipelines (25).

7. The battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing wave according to claim 4 is characterized in that: The two gas-liquid two-phase pipelines (25) are both provided with a proportional control module, and the proportional control module is used to adjust the ratio of the compressed gas (23) and the aerosol (22). The volume ratio of the compressed gas (23) to the aerosol (22) is 1:4-5.

8. The battery pack aerosol fire extinguishing penetration system based on acoustic wave resonance standing wave according to claim 1 is characterized in that: The contraction angle of the contraction section (38) is 10 to 15 degrees.

9. The battery pack aerosol fire extinguishing penetration system based on acoustic resonance standing wave according to claim 1, characterized in that: A resonator (39) is provided inside the standing wave chamber (36).

10. The battery pack aerosol fire extinguishing penetration system based on acoustic resonance standing wave according to claim 1, characterized in that: The aerosol (22) is a nano-SiO2 aerosol whose surface has been modified with trimethylsilane, and the particle size is 1-5 μm.

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