Cooling and fire extinguishing device for lithium battery of new energy automobile in underground parking space

Abstract

The invention discloses an underground parking space new energy automobile lithium battery cooling and fire extinguishing device which comprises a double-control module, and the double-control module comprises a main control module A and a main control module B which are used for regularly sending detection signals between the main control module A and the main control module B, detecting faults, exchanging sensor data and synchronously storing the data in a local database; the multi-mode sensing layer is arranged at a parking space and used for detecting whether a vehicle is parked or not and whether the temperature is too high or not, and the multi-mode sensing layer is connected with the main control module A and the main control module B; and the spraying assembly is located at the parking space and connected with the fire fighting pipeline, an electromagnetic valve is arranged at the joint, and the electromagnetic valve is connected with the main control module A and the main control module B. The system has the effects of rapid intervention, accurate cooling, remote early warning closed loop and the like, meanwhile, the fault rate of the system is reduced to 0.0002 times per year by adopting the double main control modules, and the false alarm rate is only 0.1 times per thousand of vehicle days and is reduced by 87% compared with a single-point threshold value detection mode.

Description

Technical Field

[0001] This invention relates to the field of fire protection technology, and in particular to a fire extinguishing device for cooling and extinguishing lithium batteries of new energy vehicles in underground parking spaces. Background Art

[0002] Lithium batteries in new energy vehicles are prone to thermal runaway and explosion. Existing underground parking lots have automatic fire alarm systems (such as smoke detectors and heat detectors) or manual patrols to detect fires in a timely manner. Some parking lots have fire sprinkler systems that can automatically activate the entire overhead sprinkler system. However, overhead sprinklers cannot effectively lower the lithium battery packs under the vehicle chassis. Traditional fire extinguishing methods such as foam and carbon dioxide cannot extinguish battery fires. Currently, the only means is for property management or firefighters to risk their lives to manually flush and cool the batteries with fire hoses until the fire stops.

[0003] Therefore, existing underground parking lots have the following drawbacks in cooling down lithium batteries for new energy vehicles:

[0004] 1. Traditional sprinkler systems rely on a single temperature threshold for triggering, resulting in a high false alarm rate and an inability to accurately locate the fire source;

[0005] 2. The top fire sprinkler system has insufficient coverage and cannot cover the high-temperature area of ​​the thermal runaway battery pack under the chassis, making it difficult to cool the battery pack in a targeted manner.

[0006] 3. Lack of a joint protection mechanism between adjacent parking spaces makes it easy for fire to spread;

[0007] 4. The existing fire protection system lacks a real-time remote alarm mechanism. When battery thermal runaway occurs, property management personnel and car owners cannot be notified of the danger immediately, resulting in a delay in emergency response.

[0008] 5. Early warning systems based on smoke sensors have a large response delay and cannot provide accurate and effective cooling in the early stages of battery pack thermal runaway, which can easily lead to increased losses.

[0009] 6. Some patents propose using foam fire extinguishing agents to cover thermal runaway new energy vehicles, but this cannot effectively cool the battery, and there is still a possibility of damage to adjacent parking spaces. Summary of the Invention

[0010] In view of this, in order to solve the problems of false alarm rate and inability to cover the bottom of the fire sprinkler system in the prior art, the present invention provides a cooling and fire extinguishing device for lithium batteries of new energy vehicles in underground parking spaces.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A cooling and fire extinguishing device for lithium batteries of new energy vehicles in underground parking spaces includes:

[0013] The dual control module includes a main control module A and a main control module B that periodically send detection signals to detect faults, exchange sensor data, and synchronously store the data in a local database.

[0014] A multimodal sensing layer is installed at the parking space to detect whether a vehicle is parked and whether the temperature is too high. The multimodal sensing layer is connected to the main control module A and the main control module B.

[0015] A sprinkler assembly is located at the parking space and connected to a fire hydrant pipe. A solenoid valve is installed at the connection point, and the solenoid valve is connected to main control module A and main control module B.

[0016] As a further improvement to the above technical solution:

[0017] An optimized version of the above technical solution is that it also includes an application APP, wherein both the main control module A and the main control module B are equipped with a communication module, and the communication module is connected to the application APP.

[0018] The applications include a homeowner's mobile app and a property management app.

[0019] The owner's mobile app is used to receive signals transmitted from the main control module A and main control module B of the owner's parking space.

[0020] The property management APP is used to receive signals transmitted from the main control module A and main control module B in each parking space of the entire parking lot.

[0021] An optimized version of the above technical solution is that the main control module A and the main control module B use a heartbeat detection signal to detect each other, as detailed below:

[0022] S1. If any master control unit in the dual control module does not receive a heartbeat detection signal from the other active unit within three heartbeat detection signal cycles, a reset signal is sent to restart the other master control unit.

[0023] S2. If a heartbeat detection signal is not received from another active unit after a reset signal is sent, the main control unit will transmit the main control unit fault information to the owner's mobile phone through the SIM communication module of the main control unit. At the same time, the reset signal will continue to be sent and the heartbeat detection signal will be detected until the data transmission between the two control modules is normal.

[0024] S3. When the sensor data values ​​between the main control module A and the main control module B differ too much, the sensor fault information is transmitted to the owner's mobile phone via the SIM communication module.

[0025] An optimized version of the above technical solution is that the multimodal sensing layer includes:

[0026] A vehicle sensing module, which is installed in the parking space, is used to determine whether there is a vehicle parked in the parking space;

[0027] A temperature sensing module, which is installed in the parking space, is used to detect the ambient temperature and thus determine whether the battery is overheating.

[0028] A water pressure detection module is installed on the fire water pipe outside the solenoid valve to determine whether there is enough fire water.

[0029] An optimized version of the above technical solution is that the vehicle sensing module includes N vehicle status sensors installed in the parking space.

[0030] If N / 2 parking space sensors are covered, it is determined that "a vehicle is parked".

[0031] If X parking space sensors are not covered within a unit of time, the system is determined to be in a "no vehicle parked" state, where N / 2≤X≤N;

[0032] When there is no vehicle parked, if the parking space sensor is covered, it will transmit a message to the owner's mobile phone via the SIM communication module of the main control unit that "there is a foreign object in the parking space".

[0033] An optimized version of the above technical solution is that the temperature sensing module includes several temperature sensors arranged in a matrix on the parking space. When the vehicle sensing module determines that a car has parked, the temperature sensors detect the ambient temperature within a unit of time.

[0034] When Y temperature sensors detect that the ambient temperature exceeds 80°C, the local warning light will flash.

[0035] When the Y+1 temperature sensor detects that the ambient temperature exceeds 80℃, the local warning light flashes and sends an alarm message of "parking space number + abnormal high temperature" to the property management and the owner simultaneously through the SIM communication module of the main control unit.

[0036] When Y+2 temperature sensors detect that the ambient temperature exceeds 100℃ and remains above 100℃ for a certain period of time, the solenoid valve is opened, and the sprinkler assembly sprays water. At the same time, the local warning light flashes continuously, the sound alarm is activated, and a "parking space number + battery high temperature" alarm is sent to the property management and the owner via the communication module, and the telephone rings.

[0037] Once the spray assembly starts operating, if all temperature sensors detect that the ambient temperature has dropped to the preset temperature and remains there for a certain period of time, the solenoid valve will be closed and the spray assembly will stop spraying.

[0038] An optimized solution to the above technical solution is that when the vehicle sensing module determines that the parking space is empty, the temperature sensor reduces the frequency of ambient temperature detection to check whether the temperature sensor is working properly.

[0039] An optimized version of the above technical solution is that the water pressure detection module includes several water pressure sensors installed on the fire water pipe outside the solenoid valve.

[0040] An optimized version of the above technical solution is that the spray assembly includes:

[0041] Bottom protective spray: The bottom protective spray has several atomizing spray heads distributed in a matrix on the parking space. The nozzles of the atomizing spray heads on the central axis are vertically upward. Starting from the central axis, each row of atomizing spray heads distributed on both sides is tilted outward by 5° compared to the previous row.

[0042] The side protection spray is located on the outermost side of the bottom protection spray and includes several wide-angle atomizing nozzles arranged at equal intervals with an outward tilt angle of 30°.

[0043] An optimized version of the above technical solution is that both the atomizing spray head and the wide-angle atomizing spray head are equipped with dust caps.

[0044] Compared with existing technologies, the beneficial effects of this invention are:

[0045] 1. Improved fire response efficiency

[0046] Rapid intervention: Through the algorithm in the main control module (8 sets of vehicle sensors + 16 temperature nodes) of multi-sensor fusion, the system can trigger sprinklers within 8 seconds in the early stage of thermal runaway (temperature > 100℃ and ΔT / Δt > 15℃ / s), which improves the fire control efficiency by 7.5 times compared with traditional fire protection systems (average response time > 60 seconds).

[0047] Precise cooling: The chassis-oriented spray system can achieve full chassis three-dimensional coverage. Experimental data shows that the cooling rate of the 21700 battery cell reaches 6.8℃ / s, which is 467% higher than the 1.2℃ / s of the traditional top spray system.

[0048] 2. Enhanced reliability of security protection

[0049] Dual redundancy protection: Dual main control modules (main control + backup) and multi-protocol IoT communication (4G + LoRa) reduce the system failure rate to 0.0002 times / year and the MTBF (mean time between failures) to over 50,000 hours.

[0050] False alarm rate control: Based on the spatial correlation algorithm within the main control module (requiring ≥3 non-adjacent nodes to trigger), the false alarm rate is only 0.1 times / thousand vehicles / day, which is 87% lower than the single-point threshold detection mode.

[0051] 3. Intelligent management capabilities

[0052] Remote early warning closed loop: The IoT module realizes full-link automation of "monitoring-handling-notification", the delay in delivering SMS messages to car owners is less than 8 seconds, the property management platform can simultaneously obtain temperature heat map, and the emergency response time is shortened by 64% (actual test from an average of 4.2 minutes to 1.5 minutes).

[0053] Adaptive adjustment: The flow rate of the sprinkler components can be dynamically allocated through the main control module to improve water resource utilization by 35%, with a single event water consumption of ≤150L (traditional systems ≥500L).

[0054] 4. Economic Benefit Analysis

[0055] Direct cost savings

[0056] Property loss avoidance: Early intervention can reduce the probability of total vehicle loss. Based on the average value of 200,000 yuan for new energy vehicles, a single accident can save 180,000 to 190,000 yuan in losses.

[0057] Insurance cost optimization: Parking lots that install this system can receive a 15-20% discount on property insurance rates (refer to the UL certified fire protection facility subsidy policy).

[0058] 5. Reduced operation and maintenance costs

[0059] Energy saving: The power consumption in standby mode is only 2.8W, and the annual electricity cost is less than 50 yuan per parking space;

[0060] Extended maintenance cycle: The design of 304 stainless steel spray heads and armored sensors extends the equipment replacement cycle from 2 years to 5 years, reducing overall maintenance costs by 60%.

[0061] 6. Expanding Value-Added Revenue

[0062] Data service value: Temperature field data can be sold to car manufacturers for battery safety analysis, with an estimated annual additional revenue of 120-150 yuan per parking space;

[0063] Improved management efficiency: The property management company uses an IoT platform to visualize the status of parking spaces, reducing the cost of manual inspections by 70%. Attached Figure Description

[0064] Figure 1 This is a schematic diagram of the overall system architecture of the present invention;

[0065] Figure 2This is a schematic diagram of the distribution plan of the vehicle sensor, temperature sensor, and spray head of the present invention;

[0066] Figure 3 This is a schematic cross-sectional view of the spray head model in the vertical state of the present invention;

[0067] Figure 4 This is a schematic cross-sectional view of the spray head model in the tilted state of the present invention;

[0068] Figure 5 This is a schematic diagram of the fire water pipe connection distribution structure of the present invention;

[0069] Figure 6 This is a schematic diagram of the installation structure of the temperature sensor and vehicle sensor of the present invention;

[0070] Figure 7 This is a schematic diagram of the module structure for communication between the main control unit and the application (APP) of this invention. Detailed Implementation

[0071] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0072] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0073] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0074] The overall system architecture of this technical solution is shown below:

[0075] 1. Dual control module

[0076] From the appendix Figure 1It is known that the system consists of main control module A and main control module B, which are interconnected. The two main control units periodically send heartbeat detection signals to each other, exchange sensor detection data, and store them synchronously in the local database to ensure high system reliability. If either main control unit does not receive a heartbeat detection signal from the other main control module within three heartbeat detection cycles, it sends a reset signal to reset and restart the other main control module. If it still cannot receive a heartbeat signal from the other main control module, it sends a "main control unit failure" SMS reminder to the owner's mobile phone via the SIM communication module. Then, the process of detecting heartbeat signals and sending reset signals is repeated, with a silent SMS alarm for 1 hour, until both main control modules are online simultaneously and data exchange is restored. If the sensor values ​​exchanged by the two main units differ significantly, a "sensor failure" SMS reminder is sent to the owner's mobile phone via the SIM communication module, and the location of the faulty sensor is marked on the owner's APP.

[0077] The dual-control module is based on the STM32H743 heterogeneous dual-core design, supports CAN bus communication in polling mode, and supports 4G communication modules with eSIM chips (e.g., SIM7600SA-H) to connect to the SMS gateway, enabling alarm actions such as sending SMS messages and making phone calls to owners and property management.

[0078] Meanwhile, the dual-control module should have relevant algorithms for processing temperature data, which facilitates the processing of temperature data, actively responds to the sprinkler system, and transmits the data to the owner or property management. It can also be configured with corresponding allocation algorithms to help control the sprinkler water flow.

[0079] 2. Multimodal sensing layer

[0080] 2.1 Vehicle Sensing Module

[0081] As attached Figure 1 With appendix Figure 2 As shown, the vehicle sensing module mainly consists of N (natural number) vehicle status sensors, with additional sensors attached. Figure 2 (The solid circles in the attached figure represent temperature sensors) Eight vehicle status sensors are used, arranged in two columns of 2*4 below the parking space to detect the occupancy status of the parking space. Their distribution is shown in the attached figure, which is a matrix distribution. The vehicle status sensors are inductive proximity sensors with a sensing distance of 5mm to 200mm.

[0082] If a metal object is within 20 cm and is simultaneously covered by four or more proximity sensors, it is determined that a vehicle is parked.

[0083] One minute after determining that a vehicle is parked, the battery heat detection and water valve control unit are activated until the vehicle leaves the parking space.

[0084] If more than 6 proximity sensors detect "no metal object covering" for more than 1 minute, it can be determined that the vehicle has left. At this time, the water valve control module is shut off to prevent false activation.

[0085] If a proximity sensor is consistently covered by a metal object within a "vehicle parking - vehicle departure" cycle, a text message alert indicating "object in parking space" will be sent to the owner's mobile phone via the SIM communication module, and the location of the object will be marked on the owner's APP.

[0086] 2.2 Temperature Sensing Module

[0087] As attached Figure 1 With appendix Figure 2 As shown, the temperature sensing module mainly consists of several temperature sensors. The specific number can be modified during the installation design process according to needs. This technical solution uses 16 sensors, as shown in the attached diagram. Figure 2 (The hollow circles in the attached diagram represent temperature sensors) are arranged in a matrix on the parking space. The temperature sensors only start to detect the ambient temperature at a high frequency of 1Hz 1 minute after the system determines that "a vehicle is parked". Therefore, the temperature sensor selected is a far-infrared temperature sensor (range -50 to 500℃) with a maximum sampling frequency of 10Hz.

[0088] If any temperature sensor detects that the ambient temperature exceeds 80°C, the local warning light will flash.

[0089] If two temperature sensors detect that the ambient temperature exceeds 80°C, the local warning light will flash and send an alarm message with "parking space number + abnormal high temperature" to the property management and the owner simultaneously via the communication module.

[0090] If more than three temperature sensors detect an ambient temperature exceeding 100°C for more than two seconds, the inlet solenoid valve will be opened immediately, and fire-fighting water will continuously spray through the sprinkler array to cool down the battery module under the new energy vehicle and the adjacent parking space. At the same time, the local warning light will continue to flash, the sound alarm will be activated, and a "parking space number + battery high temperature" alarm will be sent to the property management and the owner through the communication module, and the telephone will ring.

[0091] The quantity mentioned above can be changed according to actual needs. It can be modified to Y (natural number, ≥1) items, and then increased sequentially.

[0092] Once the spraying starts, if all temperature sensors detect that the ambient temperature drops to 30°C and remains there for 300 seconds, the inlet solenoid valve will be closed to stop the spraying. Manual closure of the inlet solenoid valve to stop the spraying is also supported.

[0093] After the vehicle leaves the parking space for 1 minute, the temperature sensor reduces the ambient temperature detection frequency to below 0.01Hz to check if the temperature sensor is working properly. If a sensor value does not change for more than 24 hours, or if the measured value differs too much from the average value of all sensors, it can be determined that the temperature sensor is malfunctioning. An alarm for "a certain temperature sensor is malfunctioning" can be sent to the owner through the communication module, and the location of the faulty sensor can be marked on the owner's APP.

[0094] The installation method for temperature sensors and vehicle sensors is specified in the appendix. Figure 6 As shown, in the appendix Figure 6 The numbered part is the mounting reference surface. Below the mounting reference surface, there is a mounting groove. The armored temperature sensor and vehicle sensor are installed in the mounting groove, which is numbered 7 in the attached drawing. Above the mounting groove, there is an acrylic window, which is waterproof and allows the sensor signal to pass through. Its size is about 6mm. At the same time, the output terminals of the temperature sensor and vehicle sensor are transmitted to the intermediate transmission controller (numbered 9) through the sensor RS485 data line (numbered 8), and finally transmitted to the dual control module through the CAN bus (numbered 10). It can be seen that the temperature sensor and vehicle sensor are both recessed and distributed, which helps to shield lateral interference and improve the accuracy of the sensors.

[0095] 2.3 Water Pressure Detection Module

[0096] As attached Figure 1 With appendix Figure 5 As shown, the water pressure detection module mainly consists of two water pressure sensors, which are mainly used to determine whether there is water in the fire water pipe. The water pressure sensor is a 316 stainless steel pressure transmitter with a measurement range of 0-5MPa. The installation position is at the inlet of the fire water pipe. Two installation holes are opened at the corresponding positions in the fire water pipe for installation.

[0097] If both water pressure sensors detect low water pressure simultaneously, an alarm with "parking space number + fire water pressure loss" will be sent to the property management via the communication module. If the difference between the two water pressure sensor readings is too large, an alarm with "water pressure sensor malfunction" will be sent to the homeowner via the communication module, and the location of the faulty sensor will be marked on the homeowner's app.

[0098] At the same time, by the appendix Figure 1 As can be seen from this, all the analog sensors mentioned above are converted into digital signals by ADC. After all the sensors are digitized, the sensor data is encapsulated through a CAN bus transceiver and connected to the main control module A and the main control module B through the CAN bus. A transceiver combination of STM32F407 and TJA1050 can be used.

[0099] 3. Spray assembly

[0100] 3.1 Bottom protective spray

[0101] Primarily used for cooling batteries, as shown in the attached image. Figure 2 (As shown in the attached diagram, triangles represent temperature sensors.) Several atomizing spray heads are installed in a matrix arrangement in the parking space, with a spacing of 120mm*120mm. Meanwhile, the nozzles of the atomizing spray heads along the central axis of the vehicle chassis point vertically upwards, as shown in the attached diagram. Figure 3 As shown, starting from the central axis nozzle, the outward tilt angle of each row of nozzles on both sides is 5° greater than that of the inner nozzles, as shown in the attached diagram. Figure 4 As shown, in order to achieve the effects of cooling and fire extinguishing, the bottom protective sprinkler system operates at full power at a rate of ≥20L / min·m. 2 , .

[0102] 3.2 Lateral protective spray

[0103] The main purpose is to cool down the vehicles in the parking spaces on both sides. Therefore, it is installed on both sides of the bottom protective spray system, specifically two rows of wide-angle atomizing nozzles arranged at equal intervals, with an outward tilt angle of 30°, as shown in the attached image. Figure 4 As shown, this achieves cooling of the side parking spaces, protecting them from high temperatures.

[0104] As attached Figure 5 As shown, the pipes of each wide-angle atomizing nozzle and atomizing sprinkler head are connected to the fire water pipe pre-buried underground at the rear of the vehicle. A solenoid valve is installed at the main water pipe; the on / off state of the solenoid valve controls the flow of fire water, achieving the spraying and shut-off effect of the wide-angle atomizing nozzles and atomizing sprinkler heads. An emergency stop button is installed next to the solenoid valve to manually cut off the fire water supply. Figure 5 In the diagram, number 4 is a solenoid valve, number 5 is a manual valve, and number 6 is a water pressure sensor. As shown in the attached diagram, the fire hydrant branches from a main fire hydrant pipe into multiple branch pipes. (This is in conjunction with the attached diagram.) Figure 3 With appendix Figure 4 It can be seen that the lower end of the valve is connected to the branch pipe.

[0105] At the same time, by the appendix Figure 3 With appendix Figure 4 It is known that, to prevent long-term disuse and clogging of the nozzles by foreign objects, dust caps are installed on both the atomizing and wide-angle atomizing nozzles. During operation, the water pressure can open the dust caps without affecting normal water spraying. Furthermore, the nozzles are made of 304 stainless steel with an embedded conical water distributor to atomize the columnar water, increasing the rinsing area. Figure 3 With appendix Figure 4 In the diagram, number 1 is the installation reference surface, number 2 is the spray head (wide-angle atomizing spray head or atomizing spray head), and number 3 is the dust cap. There is also a traction rope on the side of the dust cap to limit the dust cap and prevent it from being sprayed out along with the water pressure, causing property damage.

[0106] 4. Related supporting facilities, details are attached. Figure 7 As shown;

[0107] 4.1 Internet of Things Communication Module

[0108] From the appendix Figure 1 It can be understood that both main control module A and main control module B are equipped with communication modules, specifically 4GCat.1+LoRa, and have built-in eSIM cards. They can also be configured with integrated SMS gateway interfaces to support Alibaba Cloud / Tencent Cloud platform integration.

[0109] In order to alert parking occupants or security personnel in the garage, local sound and light alarms can be installed in the parking spaces. These alarms can consist of a 105dB buzzer and an LED warning light, which will alert people in the garage through sound and light.

[0110] 4.2 Power Supply and Battery

[0111] The entire device system requires a power source to operate. Therefore, the power source is directly drawn from the new energy vehicle charging pile in the new energy vehicle parking space to charge the dual control module, the sensors in the multimodal sensing layer, the solenoid valves, and the backup battery.

[0112] Meanwhile, in order to cope with power outages, the entire system should be equipped with batteries. The dual-battery power supply used in this technical solution has a capacity of ≥100Wh for each battery group. When the mains power fails, it supplies power to the main control unit, sensors, and solenoid valves, ensuring that the vehicle protection task can be completed even when the mains power fails. When the battery voltage is too low, a "low battery" prompt message is sent to the owner's mobile APP.

[0113] 4.3 APP Application

[0114] As described above, this system is equipped with a communication module for alarm functions; therefore, two apps are configured within this system.

[0115] One is a mobile app for homeowners: it displays the status of the homeowner's parking space, the real-time status and values ​​of various sensors, and receives various alarm information sent by the "main control unit".

[0116] The two are property management apps: one displays the parking status of new energy vehicles in the entire parking lot and the other receives alarm signals from the parking space's "main control unit".

[0117] The startup conditions for this system are as follows:

[0118] 1. The entire system needs to be activated after the vehicle sensors continuously detect the parked state for 1 minute to start the monitoring mode. The detection mode is to turn on the temperature sensor and monitor the ambient temperature in real time.

[0119] 2. If the alarm conditions are met, and the following conditions are also met simultaneously, the sprinkler system will be activated to spray water;

[0120] (1) This parking space has ≥3 temperature nodes >100℃;

[0121] (2) Temperature gradient ΔT / Δt > 15℃ / s;

[0122] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cooling and fire extinguishing device for lithium batteries of new energy vehicles in underground parking spaces, characterized in that, include: The dual control module includes a main control module A and a main control module B that periodically send detection signals to detect faults, exchange sensor data, and synchronously store the data in a local database. A multimodal sensing layer is installed at the parking space to detect whether a vehicle is parked and whether the temperature is too high. The multimodal sensing layer is connected to the main control module A and the main control module B. A sprinkler assembly is located at the parking space and connected to a fire hydrant pipe. A solenoid valve is installed at the connection point, and the solenoid valve is connected to main control module A and main control module B.

2. The underground parking space new energy vehicle lithium battery cooling and fire extinguishing device according to claim 1, characterized in that, It also includes an application APP. Both the main control module A and the main control module B are equipped with a communication module, which is connected to the application APP. The applications include a homeowner's mobile app and a property management app. The owner's mobile app is used to receive signals transmitted from the main control module A and main control module B of the owner's parking space. The property management APP is used to receive signals transmitted from the main control module A and main control module B in each parking space of the entire parking lot.

3. The underground parking space new energy vehicle lithium battery cooling and fire extinguishing device according to claim 1, characterized in that, The main control module A and main control module B use a heartbeat detection signal to detect each other, as detailed below: S1. If any master control unit in the dual control module does not receive a heartbeat detection signal from the other active unit within three heartbeat detection signal cycles, a reset signal is sent to restart the other master control unit. S2. If a heartbeat detection signal is not received from another active unit after a reset signal is sent, the main control unit will transmit the main control unit fault information to the owner's mobile phone through the SIM communication module of the main control unit. At the same time, the reset signal will continue to be sent and the heartbeat detection signal will be detected until the data transmission between the two control modules is normal. S3. When the sensor data values ​​between the main control module A and the main control module B differ too much, the sensor fault information is transmitted to the owner's mobile phone via the SIM communication module.

4. The underground parking space new energy vehicle lithium battery cooling and fire extinguishing device according to claim 1, characterized in that, The multimodal sensing layer includes: A vehicle sensing module, which is installed in the parking space, is used to determine whether there is a vehicle parked in the parking space; A temperature sensing module, which is installed in the parking space, is used to detect the ambient temperature and thus determine whether the battery is overheating. A water pressure detection module is installed on the fire water pipe outside the solenoid valve to determine whether there is enough fire water.

5. The underground parking space new energy vehicle lithium battery cooling and fire extinguishing device according to claim 4, characterized in that, The vehicle sensing module includes N vehicle status sensors installed in the parking space; If N / 2 parking space sensors are covered, it is determined that "a vehicle is parked". If X parking space sensors are not covered within a unit of time, the system is determined to be in a "no vehicle parked" state, where N / 2≤X≤N; When there is no vehicle parked, if the parking space sensor is covered, it will transmit a message to the owner's mobile phone via the SIM communication module of the main control unit that "there is a foreign object in the parking space".

6. The underground parking space new energy vehicle lithium battery cooling and fire extinguishing device according to claim 4, characterized in that, The temperature sensing module includes several temperature sensors arranged in a matrix on the parking space. When the vehicle sensing module determines that a car has parked, the temperature sensors detect the ambient temperature within a unit of time. When Y temperature sensors detect that the ambient temperature exceeds 80°C, the local warning light will flash. When the Y+1 temperature sensor detects that the ambient temperature exceeds 80℃, the local warning light flashes and sends an alarm message of "parking space number + abnormal high temperature" to the property management and the owner simultaneously through the SIM communication module of the main control unit. When Y+2 temperature sensors detect that the ambient temperature exceeds 100℃ and remains above 100℃ for a certain period of time, the solenoid valve is opened, and the sprinkler assembly sprays water. At the same time, the local warning light flashes continuously, the sound alarm is activated, and a "parking space number + battery high temperature" alarm is sent to the property management and the owner via the communication module, and the telephone rings. Once the spray assembly starts operating, if all temperature sensors detect that the ambient temperature has dropped to the preset temperature and remains there for a certain period of time, the solenoid valve will be closed and the spray assembly will stop spraying.

7. The underground parking space new energy vehicle lithium battery cooling and fire extinguishing device according to claim 6, characterized in that, When the vehicle sensing module determines that the parking space is empty, the temperature sensor reduces the frequency of ambient temperature detection to check whether the temperature sensor is working properly.

8. The underground parking space new energy vehicle lithium battery cooling and fire extinguishing device according to claim 4, characterized in that, The water pressure detection module includes several water pressure sensors installed on the fire water pipe outside the solenoid valve.

9. The underground parking space new energy vehicle lithium battery cooling and fire extinguishing device according to claim 1, characterized in that, The spray assembly includes: Bottom protective spray: The bottom protective spray has several atomizing spray heads distributed in a matrix on the parking space. The nozzles of the atomizing spray heads on the central axis are vertically upward. Starting from the central axis, each row of atomizing spray heads distributed on both sides is tilted outward by 5° compared to the previous row. The side protection spray is located on the outermost side of the bottom protection spray and includes several wide-angle atomizing nozzles arranged at equal intervals with an outward tilt angle of 30°.

10. The underground parking space new energy vehicle lithium battery cooling and fire extinguishing device according to claim 9, characterized in that, Both the atomizing spray head and the wide-angle atomizing spray head are equipped with dust caps.

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