Lithium-based electric bicycle fire suppression method, system, and lithium-based electric bicycle

Abstract

The present application belongs to the technical field of fire early warning and prevention and control of electric bicycles, and provides a lithium electric bicycle fire suppression method, system and lithium electric bicycle. By comparing and judging the battery temperature of the electric bicycle with the preset temperature, and comparing and judging multiple indexes such as the battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration and smoke content with specified threshold values, different stage levels of early warning are realized. After secondary early warning, the combination of aerosol fire extinguishing and cooling fire extinguishing is used to suppress the fire. Through the combination of hierarchical early warning and two fire extinguishing modes, the purpose of applying effective suppression at the best intervention time point is achieved, and the problem of poor suppression effect when aerosol acts alone is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fire early warning and prevention and control of electric bicycles, and particularly relates to a lithium-based electric bicycle fire suppression method, system and lithium-based electric bicycle. BACKGROUND

[0002] With the continuous deterioration of global environmental problems, green transportation such as electric bicycles has developed rapidly. In recent years, the annual number of electric bicycles has gradually increased, but due to the special nature of lithium batteries, design and manufacturing defects, and improper use and maintenance, electric bicycle fire accidents have shown a rapid growth trend. At present, electric bicycles generally improve the safety of charging and discharging through circuit design to avoid fire, and no reliable and efficient passive safety protection system is set up, so there is still a high risk of fire, which poses a great threat to the life and property of the user.

[0003] The inventor found that at present, there is less research on early warning and fire extinguishing technology related to electric bicycles, and there is a lack of fire warning and protection system for lithium battery electric bicycles. The main defects of the existing safety protection devices related to electric bicycles are: no early warning device is set, the fire extinguishing system mostly relies on heat-sensitive wire triggering, the flame sensing sensitivity is poor, the accuracy is low, the fire extinguishing device starts with lag, and the protection efficiency is low; Most of them are single intervention systems, which are not designed according to the thermal runaway and fire characteristics of new energy storage batteries, especially lithium batteries, and cannot apply suppression at the best intervention time, the fire extinguishing efficiency is low, and it is difficult to effectively control the fire; Most of them use small external thermal aerosols, which are difficult to play an effective role in semi-closed space, and the aerosol is difficult to effectively suppress the battery fire, so the fire suppression efficiency of the existing device is low; Most of them are traditional fire extinguishing devices, which are not targeted and have low intelligence, and are difficult to meet the needs of modern consumers. SUMMARY

[0004] In order to solve the above problems, the present application provides a lithium-based electric bicycle fire suppression method, system and lithium-based electric bicycle, which realizes the purpose of applying effective suppression at the best intervention time point by combining the scheme of hierarchical early warning and two fire extinguishing modes, and solves the problem of poor suppression effect when aerosol acts alone.

[0005] In order to achieve the above purpose, the present application is realized by the following technical scheme:

[0006] In a first aspect, the present application provides a lithium-based electric bicycle fire suppression method, comprising:

[0007] obtaining the battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration and smoke content of the electric bicycle;

[0008] determining whether the battery temperature exceeds a preset temperature, and if so, performing a first-level warning, otherwise not performing the first-level warning;

[0009] when at least two of the battery temperature and the temperature rise rate, the carbon monoxide concentration, the volatile organic compound concentration, the hydrogen concentration, and the smoke content are greater than corresponding preset index values, performing a second-level warning; at this time, it is determined that the battery of the electric bicycle has a thermal runaway fire;

[0010] After the second-level warning is performed, the fire is suppressed by combining the aerosol fire extinguishing method and the cooling fire extinguishing method.

[0011] Further, when the first-level warning is performed, it is determined whether the battery temperature exceeds a first preset temperature; when the second-level warning is performed, it is determined whether the battery temperature exceeds a second preset temperature; the first preset temperature is less than the second preset temperature.

[0012] Further, after the time for extinguishing the fire by the aerosol fire extinguishing method reaches a preset time, the cooling fire extinguishing method is used to extinguish the fire.

[0013] Further, the aerosol fire extinguishing method is implemented by an aerosol fire extinguishing system installed inside the battery cabin, and the cooling fire extinguishing method is implemented by a cooling fire extinguishing system installed outside the battery cabin.

[0014] Further, the first-level warning is a high-temperature abnormality alarm of the battery cabin, and the second-level warning is a fire alarm of the electric bicycle system; the battery temperature is obtained by a contact temperature sensor.

[0015] In a second aspect, the present application also provides a lithium-based electric bicycle fire suppression system, comprising:

[0016] The data acquisition module is configured to obtain the battery temperature and the temperature rise rate, the carbon monoxide concentration, the volatile organic compound concentration, the hydrogen concentration, and the smoke content of the electric bicycle.

[0017] The first-level warning module is configured to determine whether the battery temperature exceeds a preset temperature, and if so, perform a first-level warning, otherwise not perform the first-level warning.

[0018] The second-level warning module is configured to perform a second-level warning when at least two of the battery temperature and the temperature rise rate, the carbon monoxide concentration, the volatile organic compound concentration, the hydrogen concentration, and the smoke content are greater than corresponding preset index values; at this time, it is determined that the battery of the electric bicycle has a thermal runaway fire.

[0019] The fire suppression module is configured to, after the second-level warning is performed, suppress the fire by combining the aerosol fire extinguishing method and the cooling fire extinguishing method.

[0020] In a third aspect, the present application also provides a lithium electric bicycle, comprising an electric bicycle body, and an alarm system, an aerosol fire extinguishing system and a cooling fire extinguishing system arranged on the electric bicycle body; when fire suppression is performed:

[0021] The battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration and smoke content of the electric bicycle are acquired;

[0022] It is judged whether the battery temperature exceeds a preset temperature, and if yes, a first-level early warning is performed, otherwise, no first-level early warning is performed;

[0023] When at least two of the battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration and smoke content are greater than corresponding preset index values, a second-level early warning is performed; at this time, it is judged that the electric bicycle battery has a thermal runaway fire;

[0024] After the second-level early warning is performed, the aerosol fire extinguishing and cooling fire extinguishing are combined to perform fire suppression.

[0025] Further, the aerosol fire extinguishing system is installed inside the battery cabin, and the cooling fire extinguishing system is installed outside the battery cabin.

[0026] In a fourth aspect, the present application also provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to realize the steps of the lithium electric bicycle fire suppression method of the first aspect.

[0027] In a fifth aspect, the present application also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and executable on the processor, and the processor executes the program to realize the steps of the lithium electric bicycle fire suppression method of the first aspect.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] 1、The present application realizes early warning of different stages by comparing the battery temperature of the electric bicycle with the preset temperature, and comparing multiple indexes of the battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration and smoke content with specified thresholds; and after the second-level early warning is performed, the aerosol fire extinguishing and cooling fire extinguishing are combined to perform fire suppression, so that the purpose of applying effective suppression at the best intervention time point is realized through the scheme of graded early warning and combination of two fire extinguishing modes, and the problem of poor suppression effect of aerosol alone is solved;

[0030] 2、The present application, when the battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration and smoke content exist at least two indicators greater than the specified threshold, then determine that the electric bicycle battery thermal runaway fire, using aerosol fire extinguishing and cooling fire combination way of fire suppression, through the multi-parameter coupling early warning technology to the battery cabin high temperature anomaly, fire and other emergency situations for accurate early warning, effectively improve the sensitivity and accuracy of fire detection perception, solved by relying on the thermal sensitive line trigger, flame perception sensitivity, low accuracy and other problems;

[0031] 3、The aerosol fire extinguishing system in the present application is installed in the battery cabin, and the cooling fire extinguishing system is installed outside the battery cabin; through the built-in aerosol fire extinguishing system, and the combination of aerosol fire extinguishing and cooling fire extinguishing, the problem of external thermal aerosol system and difficult aerosol in semi-closed space to play effective inhibition is solved. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings accompanying this specification form a part of this specification, and serve to further understand the embodiments of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application.

[0033] Figure 1 The working principle diagram of the intelligent fire fighting system of the present application embodiment 1;

[0034] Figure 2 The battery unit schematic diagram of the present application embodiment 1;

[0035] Figure 3 The fire alarm system schematic diagram of the present application embodiment 1;

[0036] Figure 4 The full-automatic electric bicycle installation schematic diagram of the present application embodiment 1;

[0037] Figure 5 The power-assisted electric bicycle installation schematic diagram of the present application embodiment 1;

[0038] Figure 6 The instrument panel battery unit fire anomaly mark of the present application embodiment 1;

[0039] Figure 7 The instrument panel battery system temperature anomaly mark of the present application embodiment 1;

[0040] 1, lithium ion battery; 2, electric bicycle battery unit; 3, fire alarm system; 4, aerosol fire extinguishing system; 5, cooling fire extinguishing system; 6, solid agent storage shell; 7, aerosol agent; 8, fireproof and fire-resistant transportation pipeline; 9, gas collection hole; 10, temperature-resistant shell; 11, microcontroller; 12, VOC sensor; 13, CO sensor; 14, H2 sensor; 15, smoke sensor; 16, temperature sensor collection unit; 17, instrument panel; 18, frame; 19, battery compartment; 20, liquid agent storage cavity; 21, cooling fire extinguishing agent; 22, micro pump. DETAILED DESCRIPTION

[0041] The application will be further described below with reference to the drawings and examples.

[0042] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0043] Example 1:

[0044] Unlike electric vehicles, electric bicycles have more and more fire accidents during charging and driving due to their low cost, no regular maintenance and detection processes, and other reasons such as design and manufacturing defects, improper maintenance after long-term use, and aging of components. In order to solve the problem of electric bicycle fire, a safety protection device is provided on the electric bicycle, but the existing safety protection device for electric bicycles does not have a warning device, and the fire extinguishing system relies on a thermal sensitive wire to trigger, which has poor flame sensing sensitivity, low accuracy, delayed fire extinguishing start, and low protection efficiency. The existing safety protection device for electric bicycles is mostly a single intervention system, which is not designed according to the thermal runaway and fire characteristics of new energy storage batteries, especially lithium batteries, and cannot suppress at the best intervention time, resulting in low fire extinguishing efficiency and difficulty in effectively controlling the fire. The existing safety protection device for electric bicycles mostly uses small external thermal aerosol, which is difficult to effectively suppress in a semi-closed space, and the aerosol is difficult to effectively suppress battery fire, so the fire suppression efficiency of the existing device is low. Obviously, the existing electric bicycles, especially lithium electric bicycles, have many drawbacks in fire warning and extinguishing systems, and frequent electric bicycle fire and explosion accidents have posed a great threat to life and property safety. Therefore, it is urgent to design an efficient fire warning and control device for electric bicycles.

[0045] Based on the above problems, a lithium electric bicycle fire suppression method comprises:

[0046] acquire the battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration and smoke content of the electric bicycle;

[0047] determine whether the battery temperature exceeds the preset temperature, if yes, proceed with the first-level early warning, otherwise, do not proceed with the first-level early warning;

[0048] when at least two of the battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration and smoke content are greater than the corresponding preset index value, proceed with the second-level early warning; at this time, determine that the electric bicycle battery has thermal runaway fire;

[0049] after the second-level early warning, adopt the combination of aerosol fire extinguishing and cooling fire extinguishing to suppress the fire.

[0050] Specifically, by comparing the battery temperature of the electric bicycle with the preset temperature, and comparing the battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration and smoke content with the specified threshold, different stage-level early warnings are realized; and after the second-level early warning, the combination of aerosol fire extinguishing and cooling fire extinguishing is adopted to suppress the fire, through the combination of the stage-level early warning and the two fire extinguishing methods, the purpose of applying effective suppression at the best intervention time point is realized, and the problem of poor suppression effect when aerosol acts alone is solved.

[0051] In order to realize the above method, the embodiment provides a smart fire extinguishing system for lithium electric bicycles, which comprises a fire alarm system, a smart control system and a fire suppression system.

[0052] The fire alarm system mainly comprises a temperature-resistant shell 10, a microcontroller 11, a VOC sensor 12, a CO sensor 13, an H2 sensor 14, a smoke sensor 15, a contact temperature sensor 16, an acquisition unit, a bus and a control wire harness, etc. The fire alarm system comprises a first-level early warning and a second-level early warning, and is used for early warning of abnormal temperature of the battery unit of the electric bicycle and early warning of fire of the electric bicycle system.

[0053] The intelligent control system mainly includes a driver, a 4 / 5G data transmission module, and a cloud platform, etc. Optionally, the intelligent control system includes a wireless transmission module and a user interface, etc. The intelligent control system realizes wireless interconnection with user smart devices through the wireless transmission module, and can display the state (normal, early warning, component abnormality, and maintenance, etc.) of the fire alarm system and the fire suppression system and the life of each key component in real time. The intelligent control system can realize wired interconnection with the instrument panel through bus communication, and display the state of the fire alarm system and the fire suppression system in the instrument panel to alert the driver. The intelligent control system can be optionally equipped with a 5G module, which can realize all-weather online monitoring of the electric bicycle, and at the same time realize accurate positioning of the fire on the road network, and realize faster external fire rescue.

[0054] The intelligent control system mainly realizes mobile phone mapping, cloud monitoring, and cloud positioning. The intelligent control system includes two levels of response, which are sending abnormal information to the user end and the instrument panel when the battery unit temperature is abnormal, and sending fire information to the user end and the instrument panel when the electric bicycle catches fire, and uploading positioning information to the cloud. The fire suppression system mainly includes an aerosol fire extinguishing system 4 and a cooling fire extinguishing system 5, which specifically include a solid agent storage shell 6, an aerosol agent 7, a fireproof and fireproof transport pipeline 8, a liquid agent storage cavity 20, a cooling fire extinguishing agent 21, and a micro pump 22, etc. The intelligent control system mainly includes two levels of action, which are mainly aerosol suppression and cooling fire extinguishing system suppression.

[0055] The fire suppression system mainly includes an aerosol fire extinguishing system and a cooling fire extinguishing system, which include an aerosol agent, perfluorohexone / 2-BTP / water, a storage shell, a storage cavity, a micro pump, a fireproof pipeline, and a liquid transport pipeline, etc. The abnormal state can be warned according to the characteristic parameter changes of the battery and the electric bicycle system in different states, and control instructions are sent to the intelligent control system and the fire suppression system to quickly suppress the system fire and release a beeping sound to alert passersby. Specifically:

[0056] When the temperature of the battery detected by the contact temperature sensor 16 exceeds 70°C and does not reach 85°C, and the VOC sensor 12, the CO sensor 13, the H2 sensor 14 and the smoke sensor 15 in the system do not reach the alarm threshold, it is determined that the temperature rise of the battery unit of the electric bicycle is abnormal. The abnormal information is transmitted to the intelligent control system through the communication line, and the intelligent control system transmits the abnormal information to the user end through wireless information transmission, and displays the battery system temperature abnormality symbol to the instrument panel through bus communication. When any two of the absolute value of the battery unit temperature detected by the contact temperature sensor 16 exceeds 85°C and the temperature rise rate is 2°C / s, or the VOC sensor 12 measurement value exceeds 4% VOL, or the CO sensor 13 measurement value exceeds 1000ppm, or the H2 sensor 14 measurement value exceeds 100ppm, or the smoke sensor 15 measurement value exceeds 4.5V, the system determines that the battery unit of the electric bicycle has a thermal runaway fire, and transmits the abnormal signal to the intelligent control system through the communication line. The intelligent control system transmits the fire information to the user end through wireless information transmission, and automatically uploads the location of the electric bicycle to the cloud, assists efficient and accurate fire fighting, and displays the battery unit fire abnormal information to the instrument panel through bus communication. In addition, in order to effectively reduce the fire risk of the electric bicycle and effectively protect the safety of the driver, the fire suppression system intervenes after the secondary warning is triggered. After receiving the control command, the aerosol fire extinguishing system 4 is started by electric signal. The matrix such as potassium nitrate and strontium nitrate stored in the shell forms a powdery atmosphere in space after high temperature reaction, and quickly suppresses the flame of the system through oxygen isolation, combustion reaction chain inhibition and suffocation effect. In particular, when the control circuit is damaged and the electric signal control fails, the solid aerosol agent can also be ignited by the heat sensitive wire to release aerosol suppression.

[0057] For the battery, especially the lithium battery, the thermal runaway fire is accompanied by a violent thermal runaway chain reaction, and the existing fire extinguishing medium cannot block the thermal runaway chain reaction, so even if the system flame is extinguished, the battery still maintains a high temperature, and the high temperature environment is easy to cause the spread of thermal runaway, flame spreading and other secondary disasters, therefore, in order to more efficiently deal with the lithium electric bicycle fire, the cooling fire extinguishing system 5 is introduced into the intelligent fire fighting system of the embodiment. In order to improve the reliability of the system, no sensor control signal is set between the aerosol fire extinguishing system 4 and the cooling fire extinguishing system 5, and the linkage control of the two systems is realized through the timer in the microcontroller, and the delay start time of the two is set to 5-10s. Therefore, 5-10s after the aerosol fire extinguishing system 4 acts, the cooling fire extinguishing system 5 starts. The micro pump 22 releases the cooling fire extinguishing medium stored in the liquid agent storage cavity 20 to the electric bicycle battery cabin through the fireproof and refractory conveying pipeline 8, effectively cools the battery after thermal runaway by using the high specific heat or vaporization heat of the cooling fire extinguishing medium, efficiently takes away the heat of the battery and the electric bicycle system after thermal runaway, and effectively suppresses the reignition of the battery, the spread of the flame and the spread of the thermal runaway. Especially for the full-automatic electric bicycle and the power-assisted electric bicycle, the cooling fire extinguishing system 5 is placed in different positions, but is designed and modified according to the original structure of the electric bicycle, effectively saving space, and beautifying the original appearance design.

[0058] The aerosol fire extinguishing system 4 and the cooling fire extinguishing system 5 are triggered in response to the secondary warning, which is realized by designing a time delay. The aerosol fire extinguishing system is small in size, in the embodiment, the aerosol fire extinguishing system can be installed inside the battery cabin, and the release port is pre-installed on the battery module, so that point-to-point rapid suppression of the ignition point of a closed small cavity can be realized; in the embodiment, the cooling fire extinguishing system is installed outside the battery cabin, and is used to solve the problem of continuous high temperature of the lithium battery after thermal runaway, effectively alleviate the spread of thermal runaway and the intensity of subsequent flame, and provide more preparation time for the driver to escape and the fire brigade to rescue. In the cooling fire extinguishing system, the liquid storage cavity can be placed on both sides of the frame, and the medium can be a new halogenated alkane including but not limited to perfluorohexanone, 2-BTP and Novec7000, and the water-based medium can include but not limited to hydrogel, F500 and deionized water, etc., and different corresponding media can be selected according to the cost. In the application embodiment, the medium in the cooling fire extinguishing system installed outside the battery cabin is applied to the inside of the battery cabin through the fireproof and flame-retardant pipeline, so as to realize point-to-point accurate cooling and fire extinguishing.

[0059] Based on the current problems of the lack of electric bicycle fire protection system and low efficiency, the fire characteristics of lithium ion battery and the adaptability of various fire extinguishing media to lithium ion battery fire are proposed. The electric bicycle fire warning and prevention system has fire alarm, intelligent control and fire suppression. The system can quickly issue a warning in the incubation stage of electric bicycle fire, upload the alarm information through the intelligent control system, and quickly suppress the system fire through the cooperation of aerosol and cooling fire extinguishing medium, and prevent the spread of system fire. The proposed system can efficiently deal with lithium electric bicycle fire, improve the accuracy of early warning, and enhance the efficiency of suppression. The assembly of the system is of great significance to the safety of electric bicycles.

[0060] Embodiment 2:

[0061] The embodiment provides a lithium electric bicycle fire suppression system, comprising:

[0062] The data acquisition module is configured to acquire the battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration and smoke content of the electric bicycle;

[0063] The first warning module is configured to determine whether the battery temperature exceeds the preset temperature, and if so, to perform a first warning, otherwise not to perform a first warning;

[0064] The second warning module is configured to perform a second warning when at least two of the battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration and smoke content are greater than the corresponding preset index value; at this time, it is determined that the electric bicycle battery has a thermal runaway fire;

[0065] The fire suppression module is configured to perform fire suppression by combining aerosol fire extinguishing and cooling fire extinguishing after the second warning.

[0066] The working method of the system is the same as the lithium electric bicycle fire suppression method of embodiment 1, which will not be described here.

[0067] Embodiment 3:

[0068] The embodiment provides a lithium electric bicycle fire suppression system, which can accurately warn the system fire through the cooperation of various sensors when the electric bicycle catches fire, and send the system abnormality and fire information to the mobile phone and cloud through the intelligent control device, start the fire extinguishing and cooling system, effectively suppress the system fire and delay the spread of the fire through the cooperation of the built-in aerosol and cooling fire extinguishing medium, effectively delay the development of the electric bicycle fire, and provide sufficient time for personnel escape and external rescue; specifically:

[0069] When the battery system abnormally rises in temperature, the temperature abnormality information is transmitted to the electric bicycle instrument panel and the user's mobile phone through the wireless / wired transmission module, reminding the driver to check and handle. If the fire develops rapidly or cannot be avoided by human intervention, the electric bicycle battery system catches fire. At this time, the fire alarm system accurately detects the battery fire through the early warning system, transmits the fire warning information to the electric bicycle instrument panel and the user's mobile phone through the wireless / wired transmission module, and uploads the fire information and accurate position to the cloud to realize faster external fire rescue; at the same time, the buzzer releases an alarm, and sends a control signal to the aerosol fire extinguishing system to release aerosol to suppress the fire in the battery compartment. In this embodiment, a more effective cooling fire extinguishing medium suppression system is introduced to suppress the fire and effectively suppress the heat and fire spread of the battery. Through the cooperation of the multi-stage early warning and fire extinguishing system, the fire of the lithium electric bicycle is effectively suppressed, and the driving and use safety of the electric bicycle is ensured.

[0070] The intelligent fire fighting system mainly includes a fire alarm system, an intelligent control system and a fire suppression system. The fire alarm system mainly includes a microcontroller, a CO sensor, a VOC sensor, a H2 sensor, a smoke sensor, a temperature sensor, a bus and a control wire harness.

[0071] The fire alarm system mainly includes two-stage early warning. The first-stage early warning is high-temperature abnormality alarm of the battery compartment, and the used sensor is mainly a contact temperature sensor. The second-stage early warning is electric bicycle system fire alarm, and the used sensors are mainly CO sensor, VOC sensor, H2 sensor and smoke sensor.

[0072] The microcontroller can be a freescale single-chip microcomputer. Such MCU has low power consumption, multiple communication interfaces, high reliability and strong anti-interference ability.

[0073] The contact temperature sensor can adopt a K-type thermocouple, which is inserted into the battery module through a preformed hole and a buckle to obtain more accurate battery temperature. The reason for setting the contact temperature sensor is that the test result of the temperature is more accurate compared with the infrared temperature sensor, and the temperature absolute value and temperature rise rate are closer to the true value.

[0074] The temperature collection and judgment of the fire alarm system mainly include temperature absolute value and temperature rise rate to reduce misjudgment and improve early warning accuracy.

[0075] Optionally, in the first level of early warning, the absolute temperature threshold is 70℃, and in the second level of early warning, the absolute temperature threshold is 85℃ and the temperature rise rate threshold is 2℃ / s. The fixing buckle of the contact temperature sensor is made of high-temperature-resistant mica material, which has a maximum temperature resistance of 1000℃, and can effectively prevent temperature measurement distortion caused by high-temperature deformation. The CO sensor, H2 sensor and VOC sensor are all gas sensors based on electrochemical principle. The CO sensor is internally equipped with a self-heating device to maintain the service life and state of the gas-sensitive element, and uses high-low temperature cycle monitoring method to monitor CO gas, which has strong environmental adaptability and high test stability.

[0076] Optionally, in the second level of early warning, the parameter threshold of the CO sensor is 1000ppm. The VOC sensor tests the concentration of VOCs by changes in electrical conductivity, has simple control circuit and strong environmental adaptability, and can be used for detection of various volatile organic compounds in the battery fire process. In the second level of early warning, the parameter threshold of the VOC sensor can be 4% VOL; the alarm voltage of the smoke sensor is not less than 4.5V; the H2 sensor is based on catalytic combustion principle and tests the concentration of H2 in the environment according to the change of electrical parameters in the test circuit, and has a built-in compensation module, which can be applied to the environment with rapid changes of humidity and temperature in the electric bicycle fire process. The parameter threshold of the H2 sensor can be 100ppm or 5% VOL; the smoke sensor uses a tin dioxide semiconductor-based sensor, which has high sensitivity, fast response speed, high stability, long service life, and simple driving circuit, and can be used in complex environments during battery thermal runaway and fire process.

[0077] The fire alarm system is installed in the battery compartment of the electric bicycle outside the battery module, which can effectively improve the detection accuracy and reduce the hysteresis of the early warning system.

[0078] The intelligent control system mainly includes a driver, a 4 / 5G data transmission module, a cloud platform, etc. The main functions of the intelligent control system mainly include mobile phone mapping, cloud monitoring and cloud positioning. The driver is mainly a hardware interface device to assist data transmission and control. The main functions of the intelligent control system mainly include level conversion, providing driving force, signal buffering and isolation, and signal shaping. The 4 / 5G data transmission module is a wireless data transmission module, which can send the data of the electric bicycle battery system to the cloud server through the application layer protocol to realize online dynamic monitoring; at the same time, the module can also receive cloud data to realize remote safety control, and realize wireless cloud interconnection through data upload and download.

[0079] The fire suppression system comprises two-stage responses, both triggered after a two-stage early warning, and the first-stage response and the second-stage response are achieved by time delay design. The first-stage response and the second-stage response are aerosol fire extinguishing and cooling fire extinguishing respectively. The aerosol fire extinguishing system and the high-efficiency cooling fire extinguishing system comprise aerosol agent, cooling fire extinguishing agent, solid agent storage shell, liquid agent storage cavity, micro pump, fireproof transportation pipeline and fireproof high-temperature-resistant communication line, etc. The aerosol fire extinguishing system mainly comprises aerosol agent, solid agent storage shell, fireproof transportation pipeline and fireproof high-temperature-resistant communication line, etc.

[0080] The aerosol fire extinguishing system is small in size and can be installed inside the battery compartment, and the release port is pre-installed on the battery module. The aerosol fire extinguishing system can be an S-shaped hot aerosol, and the main agent is potassium nitrate, strontium nitrate, etc. It is started by a thermal sensitive wire or an electrical signal, and can be opened by the thermal sensitive wire combustion or the early warning system electrical signal control when a fire occurs in the battery compartment of the electric bicycle, releasing a large amount of inert gas to block the combustion reaction by suffocation and oxygen isolation. The cooling fire extinguishing system mainly comprises cooling fire extinguishing agent, liquid agent storage cavity, micro pump, fireproof transportation pipeline and fireproof high-temperature-resistant communication line, etc. The cooling fire extinguishing system can intervene in the fire scene after the aerosol system is released, rely on the high-efficiency cooling effect of the cooling fire extinguishing medium, quickly take away the heat in the battery thermal runaway and fire, and further suppress the high temperature and flame jet in the heat runaway or flame propagation.

[0081] The cooling fire extinguishing medium mainly comprises halogenated alkane and water-based medium. The halogenated alkane mainly includes but is not limited to perfluorohexanone, 2-BTP, Novec7000, etc., and the water-based medium includes but is not limited to hydrogel, F500 and deionized water, etc. In actual application, different corresponding media can be selected according to the design cost of the vehicle.

[0082] In this embodiment, in order to be aesthetically designed and reduce the impact on the energy density of the battery system, the high-efficiency cooling fire extinguishing system is mainly installed outside the battery compartment, the control harness is placed in the vehicle frame, the liquid storage cavity is placed on both sides or the bottom of the vehicle frame, and the cooling fire extinguishing medium stored on both sides or the bottom of the vehicle frame is transported to the fire area through the cooperation of the liquid delivery pipeline and the micro pump during the fire process. The dosage of the cooling fire extinguishing agent is calculated according to the heat balance.

[0083] This embodiment can accurately warn the battery compartment high temperature anomaly, fire and other sudden situations through the multi-parameter coupling early warning technology, effectively improve the sensitivity and accuracy of the fire detection perception, realize the wireless interconnection of the system, vehicle and user end, improve the intelligence degree of the fire fighting equipment, realize more efficient prevention and control and effectively cater to the needs of consumers, and the intelligent fire fighting system is equipped with the composite suppression strategy of fire extinguishing and cooling cooperation, is provided with aerosol and cooling fire extinguishing medium, and can reduce the battery temperature while suppressing the battery open fire according to the battery thermal runaway characteristics, and effectively suppress the battery flame and heat runaway propagation.

[0084] The working method of the system is the same as the lithium electric bicycle fire suppression method of embodiment 1, and contains the functions of all modules in embodiment 2, which will not be repeated here.

[0085] Embodiment 4:

[0086] The embodiment provides a lithium electric bicycle, which comprises an electric bicycle body, and an alarm system, an aerosol fire extinguishing system and a cooling fire extinguishing system arranged on the electric bicycle body; when fire suppression is performed:

[0087] The battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration and smoke content of the electric bicycle are acquired;

[0088] It is judged whether the battery temperature exceeds a preset temperature, if yes, a first-level early warning is performed, otherwise, no first-level early warning is performed;

[0089] When at least two indicators of the battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration and smoke content are greater than corresponding preset indicator values, a second-level early warning is performed; at this time, it is judged that the electric bicycle battery has a thermal runaway fire;

[0090] After the second-level early warning is performed, the aerosol fire extinguishing and the cooling fire extinguishing are combined to perform fire suppression.

[0091] Further, the aerosol fire extinguishing system is installed inside the battery cabin, and the cooling fire extinguishing system is installed outside the battery cabin.

[0092] Embodiment 5:

[0093] The embodiment provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to realize the steps of the lithium electric bicycle fire suppression method of embodiment 1.

[0094] Embodiment 6:

[0095] The embodiment provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor realizes the steps of the lithium electric bicycle fire suppression method of embodiment 1 when executing the program.

[0096] The above only describes the preferred embodiments of the present embodiment and is not used to limit the present embodiment. The present embodiment can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A method for suppressing fires in lithium-based electric bicycles, characterized in that, include: The battery temperature and rate of temperature rise of electric bicycles, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration, and smoke content are obtained. Determine if the battery temperature exceeds the preset temperature. If it does, issue a Level 1 warning; otherwise, do not issue a Level 1 warning. A level-two warning will be issued when at least two of the following indicators—battery temperature and rate of temperature rise, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration, and smoke content—exceed the corresponding preset values. At this point, it is determined that the electric bicycle battery has experienced thermal runaway fire. After issuing a level-two warning, fire suppression is carried out by combining aerosol fire extinguishing and cooling fire extinguishing methods. Aerosol fire suppression is achieved through an aerosol fire suppression system installed inside the battery compartment, with the release port pre-installed on the battery module; Cooling and extinguishing are achieved through a cooling and extinguishing system installed outside the battery compartment. A micro pump releases the cooling and extinguishing medium stored in the liquid agent storage chamber into the electric bicycle battery compartment through a fireproof and fire-resistant transport pipeline. After the preset time of 5-10 seconds has elapsed when using aerosol extinguishing method to extinguish the fire, cooling extinguishing method should be used instead.

2. The method for suppressing lithium-ion electric bicycle fires as described in claim 1, characterized in that, When a Level 1 warning is issued, it is determined whether the battery temperature exceeds a first preset temperature; when a Level 2 warning is issued, it is determined whether the battery temperature exceeds a second preset temperature; the first preset temperature is less than the second preset temperature.

3. The method for suppressing lithium-ion electric bicycle fires as described in claim 1, characterized in that, The first-level warning is an alarm for abnormal high temperature in the battery compartment, and the second-level warning is an alarm for fire in the electric bicycle system; the battery temperature is obtained using a contact-type temperature sensor.

4. A lithium-based electric bicycle fire suppression system, characterized in that, include: The data acquisition module is configured to acquire the battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration, and smoke content of the electric bicycle. The Level 1 warning module is configured to: determine whether the battery temperature exceeds the preset temperature; if so, issue a Level 1 warning; otherwise, do not issue a Level 1 warning. The secondary warning module is configured to issue a secondary warning when at least two of the following indicators—battery temperature and temperature rise rate, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration, and smoke content—exceed the corresponding preset indicator values. At this point, it is determined that the electric bicycle battery has experienced thermal runaway fire. The fire suppression module is configured to suppress fire by combining aerosol extinguishing and cooling extinguishing methods after a level-two warning is issued. Aerosol fire suppression is achieved through an aerosol fire suppression system installed inside the battery compartment, with the release port pre-installed on the battery module; Cooling and extinguishing are achieved through a cooling and extinguishing system installed outside the battery compartment. A micro pump releases the cooling and extinguishing medium stored in the liquid agent storage chamber into the electric bicycle battery compartment through a fireproof and fire-resistant transport pipeline. After the preset time of 5-10 seconds has elapsed when using aerosol extinguishing method to extinguish the fire, cooling extinguishing method should be used instead.

5. A lithium-ion electric bicycle, characterized in that, Includes the electric bicycle body, and an alarm system, aerosol fire extinguishing system, and cooling fire extinguishing system installed on the electric bicycle body; during fire suppression: The battery temperature and rate of temperature rise of electric bicycles, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration, and smoke content are obtained. Determine if the battery temperature exceeds the preset temperature. If it does, issue a Level 1 warning; otherwise, do not issue a Level 1 warning. A level-two warning will be issued when at least two of the following indicators—battery temperature and rate of temperature rise, carbon monoxide concentration, volatile organic compound concentration, hydrogen concentration, and smoke content—exceed the corresponding preset values. At this point, it is determined that the electric bicycle battery has experienced thermal runaway fire. After issuing a level-two warning, fire suppression is carried out by combining aerosol fire extinguishing and cooling fire extinguishing methods. Aerosol fire suppression is achieved through an aerosol fire suppression system installed inside the battery compartment, with the release port pre-installed on the battery module; Cooling and extinguishing are achieved through a cooling and extinguishing system installed outside the battery compartment. A micro pump releases the cooling and extinguishing medium stored in the liquid agent storage chamber into the electric bicycle battery compartment through a fireproof and fire-resistant transport pipeline. After the preset time of 5-10 seconds has elapsed when using aerosol extinguishing method to extinguish the fire, cooling extinguishing method should be used instead.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the lithium-based electric bicycle fire suppression method as described in any one of claims 1-3.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the lithium-based electric bicycle fire suppression method as described in any one of claims 1-3.

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