A method and device for inhibiting the linkage of a ship power battery overcharge thermal runaway and a storage medium

Abstract

The application relates to the technical field of thermal runaway, and particularly discloses a linkage inhibition method and device for thermal runaway of overcharging of a ship power battery and a storage medium, the method comprising the following steps: performing thermal runaway analysis on multidimensional sensing data to generate an analysis result; if the analysis result indicates that a thermal runaway accident exists, performing a first thermal inhibition operation; if the analysis result indicates that a thermal runaway risk exists, performing ship environment interference verification to generate an interference verification result; judging whether the thermal runaway accident exists based on the interference verification result; if the thermal runaway accident exists, performing the first thermal inhibition operation; and if the thermal runaway accident does not exist, performing a corresponding second thermal inhibition operation based on the multidimensional sensing data. Through multidimensional sensing data analysis and ship environment interference verification, the application improves the accuracy of thermal runaway accident identification under the complex environment of a ship, and avoids misjudgment and excessive inhibition caused by environmental interference.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal runaway, in particular to a linkage inhibition method and device for thermal runaway of overcharged ship power battery and a storage medium. BACKGROUND

[0002] With the development of the electric trend of ships, the safety of ship power batteries, as core energy components, is directly related to the safety of ship navigation. Ship power batteries have the characteristics of large capacity and high charging and discharging power, and are prone to cause fire, explosion and other accidents due to thermal runaway during overcharging.

[0003] Traditional ship power battery overcharge thermal runaway inhibition generally relies on temperature, gas concentration and other parameters, and cannot fully adapt to the specific working conditions of ships. For example, the continuous low-frequency vibration of the main engine of the ship may cause the temperature sensor to produce a transient false temperature rise signal, and the long-term salt spray environment accelerates the aging of the electrochemical sensor, reducing the reliability of the data. These problems make it difficult for existing methods to accurately distinguish between real thermal runaway and environmental interference, and often misjudge thermal runaway and execute aggressive suppression measures such as fire extinguishing agent injection when only two parameters are detected to be abnormal, resulting in over-suppression and waste of fire extinguishing medium and power resources; and when real thermal runaway occurs, the emergency resources are consumed due to the previous false alarm, which may delay the critical suppression opportunity and cause the fire to spread. SUMMARY

[0004] In order to overcome the above technical problems in the prior art, the present application provides a linkage inhibition method and device for thermal runaway of overcharged ship power battery and a storage medium.

[0005] The present application provides a linkage inhibition method for thermal runaway of overcharged ship power battery, the method comprising: acquiring multi-dimensional sensing data of the ship power battery; performing thermal runaway analysis on the multi-dimensional sensing data to generate an analysis result; if the analysis result indicates that there is a thermal runaway accident, performing a first thermal suppression operation; if the analysis result indicates that there is a thermal runaway risk, performing a ship environmental interference verification to generate an interference verification result; determining whether there is the thermal runaway accident based on the interference verification result; if there is the thermal runaway accident, performing the first thermal suppression operation; and if there is no thermal runaway accident, performing a corresponding second thermal suppression operation based on the multi-dimensional sensing data.

[0006] Preferably, the multi-dimensional sensing data includes temperature data, gas concentration data and ultraviolet characteristic data, and the thermal runaway analysis on the multi-dimensional sensing data to generate an analysis result comprises:

[0007] determining a temperature rising rate based on the temperature data; determining whether the temperature rising rate is greater than a first rate value; if the temperature rising rate is greater than the first rate value, obtaining a duration, and in a case that the duration is greater than a preset time threshold, determining that a first thermal runaway condition is met; determining a concentration rising rate based on the gas concentration data; determining whether the concentration rising rate is greater than a second rate value; if the concentration rising rate is greater than the second rate value, determining that a second thermal runaway condition is met;

[0008] determining a micro-spark energy corresponding to the ultraviolet feature data; determining whether the micro-spark energy is greater than a preset energy threshold; if the micro-spark energy is greater than the preset energy threshold, determining that a third thermal runaway condition is met; determining whether the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition are met simultaneously; if the three thermal runaway conditions are met simultaneously, generating an analysis result that a thermal runaway accident exists; otherwise, generating an analysis result that a thermal runaway risk exists.

[0009] Preferably, the multi-dimensional sensing data further includes inclination data and vibration data, and the method further includes: performing dynamic correction processing on the inclination data to obtain a corrected inclination angle; correcting the gas concentration data based on the corrected inclination angle to obtain corrected concentration data; determining whether the vibration data meets a preset host vibration triggering frequency and / or a wave vibration triggering frequency; if yes, performing adaptive Kalman filtering processing on the temperature data to obtain processed temperature data; performing thermal runaway analysis based on the corrected concentration data, the processed temperature data and the ultraviolet feature data to generate an analysis result.

[0010] Preferably, the performing the first thermal suppression operation includes: determining a short-circuit voltage of the ship power battery; determining a first fire extinguishing agent and an initial insulation enhancer; determining an adding proportion of the initial insulation enhancer in the first fire extinguishing agent based on the short-circuit voltage; configuring an insulation fire extinguishing agent based on the initial insulation enhancer, the adding proportion and the first fire extinguishing agent; and performing a corresponding fire extinguishing agent spraying operation based on the insulation fire extinguishing agent.

[0011] Preferably, the multi-dimensional sensing data further includes battery voltage data and pressure relief valve state data, and the performing ship environment interference verification to generate an interference verification result includes: determining whether a voltage drop of the ship power battery within a preset time reaches a preset pressure drop threshold based on the battery voltage data;

[0012] If the voltage drop reaches the preset voltage drop threshold within the preset time, a first criterion is generated; if the duration is greater than the preset time threshold, a second criterion is generated; if the pressure relief valve state data represents that the pressure relief valve has been opened, a third criterion is generated; if the first criterion, the second criterion and the third criterion are obtained, an interference verification result not affected by environmental interference is generated; if at least one of the first criterion, the second criterion and the third criterion is not obtained, an interference verification result affected by environmental interference is generated.

[0013] Preferably, the method further comprises: obtaining charging voltage data; extracting abnormal voltage drop data from the charging voltage data; correcting the battery voltage data based on the abnormal voltage drop data to generate corrected voltage data; and determining whether the voltage drop of the ship power battery within a preset time reaches a preset voltage drop threshold based on the corrected voltage data.

[0014] Preferably, the second heat suppression operation based on the multi-dimensional sensing data comprises: if any two of the first heat runaway condition, the second heat runaway condition and the third heat runaway condition are met, cutting off the charging circuit and performing a sound-light alarm operation; and if only one of the first heat runaway condition, the second heat runaway condition and the third heat runaway condition is met, starting a liquid cooling system and performing a current-limiting charging operation on the ship power battery.

[0015] Preferably, the method further comprises: obtaining a temperature of an adjacent battery module of the ship power battery.

[0016] determining whether the temperature rise of the adjacent battery module reaches a preset temperature rise threshold based on the temperature of the adjacent battery module; and if so, spraying a second fire extinguishing agent to a cabin where the ship power battery is located, and performing a battery cluster power cutoff operation and a deck ventilation operation.

[0017] Correspondingly, the application provides a linkage inhibition device for overcharge thermal runaway of a ship power battery, the device comprising: a data acquisition module for acquiring multi-dimensional sensing data of the ship power battery; a thermal runaway analysis module connected to the data acquisition module, for performing thermal runaway analysis on the multi-dimensional sensing data to generate an analysis result; an environmental interference verification module connected to the thermal runaway analysis module, for performing ship environmental interference verification when the analysis result represents a thermal runaway risk to generate an interference verification result; and a control execution module connected to the thermal runaway analysis module and the environmental interference verification module, for: if the analysis result represents a thermal runaway accident, performing a first thermal inhibition operation; if the analysis result represents a thermal runaway risk: judging whether there is a thermal runaway accident based on the interference verification result; if there is the thermal runaway accident, performing the first thermal inhibition operation; and if there is not the thermal runaway accident, performing a corresponding second thermal inhibition operation based on the multi-dimensional sensing data.

[0018] In addition, the application further provides a computer readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the method provided by the embodiments of the application.

[0019] Through the technical solutions provided by the application, the application has at least the following technical effects:

[0020] Through multi-dimensional sensing data analysis and ship environmental interference verification, the accuracy of thermal runaway accident identification in a complex ship environment is significantly improved, and misjudgment and excessive inhibition caused by environmental interference are avoided.

[0021] Other features and advantages of the embodiments of the application will be described in detail in the following specific implementation part. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the embodiments of the application, and constitute a part of the specification, and are used together with the following specific implementation part to explain the embodiments of the application, but do not constitute a limitation on the embodiments of the application. In the drawings:

[0023] Figure 1 is a flowchart of a linkage inhibition method for overcharge thermal runaway of a ship power battery provided by the embodiments of the application;

[0024] Figure 2 is a structural schematic diagram of a linkage inhibition device for overcharge thermal runaway of a ship power battery provided by the embodiments of the application. DETAILED DESCRIPTION

[0025] The specific implementation of the embodiments of the present application is described in detail below with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiments of the present application, and is not used to limit the embodiments of the present application.

[0026] The terms "system" and "network" in the embodiments of the present application can be used interchangeably. "Multiple" means two or more, and therefore "multiple" in the embodiments of the present application can also be understood as "at least two". The association relationship of the associated objects is described, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / ", if not specially stated, generally represents that the associated objects before and after it are in an "or" relationship. In addition, it should be understood that in the description of the embodiments of the present application, "first", "second", etc. are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can it be understood as indicating or implying order.

[0027] The conventional overcharge thermal runaway suppression of the ship power battery generally relies on parameters such as temperature and gas concentration, and cannot fully adapt to the specific working conditions of the ship. For example, the continuous low-frequency vibration of the ship main engine can cause the temperature sensor to generate a transient false temperature rise signal, and the long-term salt spray environment can accelerate the aging of the electrochemical sensor, reducing the data reliability. These problems make it difficult for existing methods to accurately distinguish between real thermal runaway and environmental interference, and often misjudge as thermal runaway when only two parameters are detected to be abnormal, and execute aggressive suppression measures such as fire extinguishing agent injection, forming an over-suppression phenomenon, and further causing waste of fire extinguishing medium and power resources; and when real thermal runaway occurs, the emergency resources are consumed due to the previous false alarm, which may delay the critical suppression opportunity, leading to the spread of the fire.

[0028] Based on the above reasons, referring to Figure 1 The present application provides a linkage suppression method for overcharge thermal runaway of a ship power battery, which comprises:

[0029] S1, acquiring multi-dimensional sensing data of the ship power battery.

[0030] In one possible implementation, the multi-dimensional sensing data of the ship power battery is collected through a distributed sensing network, and the multi-dimensional sensing data includes but is not limited to temperature data, gas concentration data, ultraviolet characteristic data, battery voltage data, vibration data, etc. The temperature data includes single battery temperature data, battery module temperature data, etc. The gas concentration data includes combustible gas concentration data and toxic gas concentration data generated by the battery.

[0031] S2, performing thermal runaway analysis on the multi-dimensional sensing data to generate an analysis result.

[0032] After the multi-dimensional sensing data is acquired, the data needs to be analyzed to determine whether to send a thermal runaway accident, so as to facilitate subsequent operation. Although the common thermal runaway analysis has tried to refer to a multi-parameter fusion method, the parameter values are mainly considered, and the parameters are not further analyzed and processed, so that misjudgment is prone to occur.

[0033] In the embodiment of the application, the multi-dimensional sensing data includes temperature data, gas concentration data and ultraviolet characteristic data, the thermal runaway analysis on the multi-dimensional sensing data is performed to generate an analysis result, including: determining a temperature rising rate based on the temperature data; determining whether the temperature rising rate is greater than a first rate value; if the temperature rising rate is greater than the first rate value, acquiring a duration, and in a case where the duration is greater than a preset time threshold, determining that a first thermal runaway condition is met; determining a concentration rising rate based on the gas concentration data; determining whether the concentration rising rate is greater than a second rate value; if the concentration rising rate is greater than the second rate value, determining that a second thermal runaway condition is met; determining a corresponding micro-spark energy based on the ultraviolet characteristic data; determining whether the micro-spark energy is greater than a preset energy threshold; if the micro-spark energy is greater than the preset energy threshold, determining that a third thermal runaway condition is met; determining whether the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition are met simultaneously; if the three thermal runaway conditions are met simultaneously, generating an analysis result that a thermal runaway accident exists; otherwise, generating an analysis result that a thermal runaway risk exists.

[0034] Temperature is the most basic monitoring parameter of power battery thermal runaway, which can directly reflect the energy accumulation state in the power battery. In the process of overcharge thermal runaway, the decomposition of power battery materials and short-circuit heat release will cause the temperature to rise rapidly. The essence of power battery thermal runaway is a chain chemical reaction process, which will release CO, H2, alkane and other characteristic gases at different stages. The release rate and concentration change of the gases are prior to the occurrence of open fire or rapid temperature rise, which is a key indication of thermal runaway. In the later stage of thermal runaway, the internal short circuit of the battery or the gas combustion will produce micro-spark, electric arc and other phenomena, and the ultraviolet spectral characteristics thereof are unique, which are direct physical evidence of thermal runaway. Therefore, the multi-dimensional sensor data in the thermal runaway analysis of the multi-dimensional sensing data in the embodiment of the application is preferably temperature data, gas concentration data and ultraviolet characteristic data.

[0035] In a possible implementation, temperature data of key positions in the ship power battery corresponding to a cell and a battery module is monitored in real time by a temperature sensor, a temperature increase rate is calculated based on the temperature data, if the temperature increase rate exceeds a first rate value and a duration is greater than a preset time threshold, it is determined that a first thermal runaway condition is met, gas concentration data of key positions in the ship power battery corresponding to CO, H2 and electrolyte volatile gas is monitored in real time by a gas sensor, a concentration increase rate is calculated based on the monitored gas concentration data, if the concentration increase rate exceeds a second rate value, it is determined that a second thermal runaway condition is met, ultraviolet characteristic data of key positions in the ship power battery is monitored in real time by an ultraviolet flame sensor, flame spectrum intensity and flame spectrum frequency are extracted from the ultraviolet characteristic data, a microspark energy value is calculated based on the flame spectrum intensity and the flame spectrum frequency, if the microspark energy exceeds a preset energy threshold, it is determined that a third thermal runaway condition is met, only when the three conditions are met at the same time, an analysis result of a thermal runaway accident is generated, and if any condition is not met, it is determined that there is a thermal runaway risk.

[0036] In the embodiment of the present application, the temperature data, the gas concentration data and the ultraviolet characteristic data are further analyzed, the temperature increase rate, the concentration increase rate and the microspark energy value are obtained, a plurality of thermal runaway conditions are generated based on the temperature increase rate, the concentration increase rate and the microspark energy value, and the plurality of thermal runaway conditions are cooperatively judged, so that the accurate division of the thermal runaway accident and the thermal runaway risk is realized.

[0037] However, in actual application, the inclination and vibration in ship navigation seriously interfere with the authenticity of the temperature data and the gas concentration data. Specifically, the inclination of the ship body causes the concentration value collected by the gas sensor to deviate from the actual distribution, resulting in distortion of the gas concentration data, and the vibration of the ship main engine and the impact of the sea waves can cause high-frequency noise of the temperature sensor, which covers the real temperature change trend. If these environmental disturbances are not processed specifically, the original data is directly used for thermal runaway analysis, which can cause the judgment accuracy to decrease and affect the effectiveness of the suppression measures.

[0038] In the embodiment of the present application, the multi-dimensional sensing data further includes inclination data and vibration data, and the method further includes: performing dynamic correction processing on the inclination data to obtain a corrected inclination angle; correcting the gas concentration data based on the corrected inclination angle to obtain corrected concentration data; judging whether the vibration data meets a preset main engine vibration trigger frequency and / or a wave vibration trigger frequency; if yes, performing adaptive Kalman filtering processing on the temperature data to obtain processed temperature data; and performing thermal runaway analysis based on the corrected concentration data, the processed temperature data and the ultraviolet characteristic data to generate an analysis result.

[0039] In a possible implementation, an inclination sensor is arranged in a cabin where the ship power battery is stored, and the inclination sensor has a range of ±15° to adapt to the working condition of the ship. The inclination data of the cabin is collected in real time through the inclination sensor, and a tilt compensation algorithm is introduced for the real-time gas concentration data of the gas sensor. The gas concentration is corrected according to the inclination data of the cabin to obtain corrected concentration data. The correction formula is derived based on a gas diffusion model, for example, corrected concentration data = gas concentration data x cosθ, θ is the inclination data (inclination angle), so as to ensure that the real gas concentration level can be reflected under different inclination states. Secondly, in view of the problem that the temperature sensing data is affected by vibration, vibration data (vibration acceleration) of the ship power battery is collected through a vibration sensor, and the vibration data is input into an adaptive Kalman filtering algorithm to dynamically suppress noise of the temperature sensing data. The algorithm can adaptively adjust the filtering parameters according to the vibration data, effectively filter out the temperature pulse interference caused by the vibration of the ship, and retain the real temperature data. Through tilt compensation and vibration filtering processing, the corrected temperature data and the corrected concentration data that are corrected by the environment are finally obtained, which are used as reliable basis for heat runaway judgment. The heat runaway analysis is performed on the processed temperature data, the corrected concentration data and the ultraviolet characteristic data to generate an analysis result.

[0040] In the embodiments of the present application, the gas concentration data is corrected through the inclination data, and the temperature data is corrected through the vibration data, which significantly improves the accuracy and stability of multi-dimensional sensing data, and effectively eliminates the interference of ship body inclination and mechanical vibration on heat runaway analysis.

[0041] In addition, the seawater salt spray environment can accelerate the aging of the sensor. In a possible implementation, the relationship curve between the salt spray concentration and each sensor can also be fitted through experiments, and each multi-dimensional sensing data is corrected according to the relationship curve, to further provide the reliability of the data.

[0042] S3, if the analysis result represents that there is a heat runaway accident, a first heat suppression operation is performed.

[0043] When the analysis result represents that there is a heat runaway accident, a heat runaway suppression operation needs to be performed on the ship power battery to suppress the further development of the heat runaway accident. Specifically, the first heat suppression operation is to spray a fire extinguishing agent to the ship power battery.

[0044] Common extinguishing agents include water-based, dry powder and perfluoroacetone, however, the water-based extinguishing agent has conductivity, which is easy to cause short circuit of the battery module after spraying; the residual particles of the dry powder extinguishing agent can reduce the electrical insulation performance; the perfluoroacetone is a clean gas extinguishing agent, but the breakdown voltage generated by the thermal runaway of the power battery causes the aging of the insulating layer of the battery pole, and there is a risk of secondary short circuit, based on this, the extinguishing agent sprayed when the first thermal operation is performed in the embodiment of the application is selected to be perfluoroacetone, and the insulation performance of the extinguishing agent is also improved.

[0045] In the embodiment of the application, the first thermal suppression operation includes: determining the short-circuit voltage of the ship power battery; determining a first extinguishing agent and an initial insulation enhancer; determining the adding proportion of the initial insulation enhancer in the first extinguishing agent based on the short-circuit voltage; configuring an insulation extinguishing agent based on the initial insulation enhancer, the adding proportion and the first extinguishing agent; and performing a corresponding insulation extinguishing agent spraying operation based on the insulation extinguishing agent.

[0046] In a possible implementation, the higher the short-circuit voltage, the more the initial insulation enhancer needs to be added in the first extinguishing agent, specifically, the short-circuit voltage of the ship power battery is monitored in real time; perfluoroacetone is selected as the first extinguishing agent based on the short-circuit voltage, and perfluoropolyether insulation enhancer is used as the initial insulation enhancer, which is added to the perfluoroacetone at a mass ratio of 0.5%, the perfluoroacetone is chemically modified, the volume resistivity of the modified perfluoroacetone is greater than or equal to 1*10 5 Ω·cm, and the breakdown voltage reaches 35kV, so as to realize the configuration of the insulation extinguishing agent; and the configured insulation extinguishing agent is sprayed to the ship power battery through the extinguishing agent spraying system.

[0047] The embodiment of the application dynamically configures the insulation extinguishing agent based on the short-circuit voltage, realizes the synergistic effect of extinguishing and insulation, effectively blocks the continuous generation of short-circuit arc, greatly reduces the risk of secondary short circuit, ensures the effectiveness of suppression under various fault scenarios, and improves the safety and reliability of the extinguishing operation.

[0048] S4, if the analysis result represents that there is a risk of thermal runaway, a ship environment disturbance verification is performed to generate a disturbance verification result.

[0049] The vibration and other environmental disturbances in the ship environment can cause multi-dimensional data anomalies, for example, the low-frequency vibration of the ship main engine can cause temperature rise pulses, and the vibration caused by wave impact can cause transient temperature spikes. In order to avoid misjudging the data fluctuation under normal working conditions as a thermal runaway accident and causing unnecessary suppression operation and affecting the stability of the ship energy system, when the analysis result represents that there is a risk of thermal runaway, the ship environment disturbance verification needs to be further performed.

[0050] In the embodiment of the present application, the multi-dimensional sensing data further includes battery voltage data and pressure relief valve state data, the execution of the ship environment interference verification and the generation of the interference verification result include: judging whether the voltage drop of the ship power battery within a preset time reaches a preset voltage drop threshold based on the battery voltage data; if the voltage drop reaches the preset voltage drop threshold within the preset time, a first criterion is generated; if the duration is greater than the preset time threshold, a second criterion is generated; if the pressure relief valve state data represents that the pressure relief valve has been opened, a third criterion is generated; if the first criterion, the second criterion and the third criterion are obtained, an interference verification result of not being interfered by the environment is generated; if at least one of the first criterion, the second criterion and the third criterion is not obtained, an interference verification result of being interfered by the environment is generated.

[0051] In a possible implementation, the voltage drop is the essence of electrochemical runaway, the temperature rise rate corresponding to the duration is the performance of heat diffusion, and the pressure relief valve state is the ultimate evidence of mechanical deformation of the ship power battery. Therefore, in the thermal runaway risk state, the embodiment of the present application introduces the battery voltage data, the pressure relief valve state data and the duration corresponding to the temperature rise rate to verify the ship environment interference. Specifically, the battery voltage data is collected by the ship power battery management system in real time at a set sampling frequency, the voltage drop within a preset time is calculated, and if the voltage drop is greater than a preset voltage drop threshold, a first criterion is generated. If the duration is greater than a preset time threshold, a second criterion is generated. The pressure relief valve state is detected by an integrated position sensor, and when the pressure relief valve is detected to be opened, a third criterion is generated. When the three criteria are met at the same time, it is determined that the thermal runaway signal is not affected by environmental factors such as ship vibration interference, and an interference verification result of not being interfered by the environment is generated, triggering subsequent suppression operations. If any criterion is not met, it is determined that there is environmental interference, and an interference verification result of being interfered by the environment is generated, and the suppression operation is suspended and a sensor data review process is started. Specifically, the voltage drop threshold is 25%, the temperature rise rate threshold is 1° / s, and the duration threshold is 3s. When the voltage drop is greater than 25%, the temperature rise rate is greater than 1° / s, the duration is greater than 3s, and the pressure relief valve is opened, an interference verification result of not being interfered by the environment is generated.

[0052] The embodiment of the present application effectively distinguishes between real thermal runaway and environmental interference through a multi-criterion joint verification mechanism, greatly reducing the false trigger rate of the suppression measure. The introduction of the voltage drop and the pressure relief valve state parameter doubly proves the authenticity of the thermal runaway from the electrical characteristics and mechanical state, improving the rigor of the verification logic.

[0053] During the charging process of the ship power battery, fluctuations in the shore power supply or abnormalities in the charger can cause abnormal charging voltage, interfere with the accuracy of the battery voltage data, and further affect the detection accuracy of the voltage drop in the thermal runaway risk judgment.

[0054] In the embodiment of the present application, the method further comprises: acquiring charging voltage data; extracting abnormal voltage drop data from the charging voltage data; correcting the battery voltage data based on the abnormal voltage drop data to generate corrected voltage data; and determining whether the voltage drop of the ship power battery within a preset time reaches a preset voltage drop threshold based on the corrected voltage data.

[0055] In a possible implementation, the charging voltage data is collected in real time by a voltage sensor at a charging interface corresponding to the ship power battery, a wavelet transform algorithm is used to perform multi-scale decomposition on the voltage curve to separate normal charging voltage drop and abnormal interference such as power grid sudden drop and pulse noise, an abnormal voltage drop model is constructed based on interference characteristics to subtract interference from the battery voltage data to generate corrected voltage data, and the voltage drop within the preset time is recalculated based on the corrected voltage data, and if the preset voltage drop threshold is reached, a first criterion is generated, otherwise it is determined that the voltage drop is caused by charging interference.

[0056] The embodiment of the present application effectively eliminates the interference of power grid fluctuations on battery voltage data through correction of charging voltage, significantly improves the accuracy of voltage drop detection, ensures the reliability of the first criterion in ship environmental interference verification, avoids misjudgment caused by abnormal charging voltage, and provides key support for accurate judgment of thermal runaway accidents.

[0057] S5, determining whether the thermal runaway accident exists based on the interference verification result: if the thermal runaway accident exists, performing the first thermal suppression operation; and if the thermal runaway accident does not exist, performing a corresponding second thermal suppression operation based on the multi-dimensional sensing data.

[0058] If the interference verification result is that no environmental interference is received, it is determined that the thermal runaway accident exists, and a corresponding first thermal suppression operation is performed; if the interference verification result is that environmental interference is received, it is determined that the thermal runaway accident does not exist, although the thermal runaway accident does not exist, there is still a risk of thermal runaway, and therefore a corresponding second thermal suppression operation is performed based on multi-dimensional sensing data.

[0059] The second thermal suppression operation can be to cut off the power supply of the ship power battery, which leads to excessive suppression in a low-risk scenario and affects the endurance of the ship, and insufficient suppression in a high-risk scenario, which is easy to escalate into an accident.

[0060] In the embodiment of the present application, the performing of the corresponding second thermal inhibition operation based on the multi-dimensional sensing data comprises: if any two of the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition are met, cutting off the charging circuit and performing an audible and visual alarm operation; if only one of the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition is met, starting the liquid cooling system and performing a current-limiting charging operation on the ship power battery.

[0061] In a possible implementation, in order to avoid a one-size-fits-all thermal inhibition, the embodiment of the present application performs hierarchical inhibition according to the number of thermal runaway conditions met, specifically, if any one of the first thermal runaway condition and the second thermal runaway condition is met, it belongs to low risk, at this time, the second thermal inhibition operation performed is to perform a current-limiting charging current operation to reduce the load of the ship power battery, and start the liquid cooling system to perform liquid cooling on the ship power battery; if any two of the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition are met, it belongs to high risk, at this time, the second thermal inhibition operation performed is to cut off the charging circuit and start the audible and visual alarm system to prompt the crew to perform emergency treatment. More specifically, if the temperature rise rate is greater than the first rate value and the duration is greater than the preset duration, the gas concentration rise rate is greater than the second rate value, and the microspark energy is less than the preset energy threshold value, the charging circuit is cut off, and the audible and visual alarm system is started to prompt the crew to perform emergency treatment; if the temperature rise rate is greater than the first rate value and the duration is greater than the preset duration, the gas concentration rise rate is greater than the second rate value, the microspark energy is less than the preset energy threshold value, and the microspark energy is less than the preset energy threshold value, the charging current is reduced, and the liquid cooling system is started.

[0062] The hierarchical inhibition strategy provided by the embodiment of the present application realizes hierarchical inhibition of thermal runaway risk, reduces the influence on the ship's endurance under the premise of ensuring safety.

[0063] It should be noted that, in order to reduce space waste, the liquid cooling system and the fire extinguishing agent spraying system provided by the embodiment of the present application adopt a shared spray pipe network design, and pipeline integration is achieved through a three-way mixer. The liquid cooling system includes a liquid cooling pipeline and a first electromagnetic valve for conveying cooling liquid; the fire extinguishing agent spraying system includes a fire extinguishing agent pipeline and a second electromagnetic valve for conveying insulating fire extinguishing agent. The liquid cooling pipeline and the fire extinguishing agent pipeline are connected to the same spray pipe network through the three-way mixer, so as to realize a shared conveying channel for the cooling medium and the fire extinguishing medium. According to different working conditions, the state of the electromagnetic valve is controlled: when the liquid cooling system is started, the first electromagnetic valve is opened and the second electromagnetic valve is closed, the cooling liquid enters the battery pack through the spray pipe network to liquid cool the ship power battery; when the fire extinguishing agent spraying system is started, the first electromagnetic valve is closed and the second electromagnetic valve is opened, the insulating fire extinguishing agent is sprayed into the battery pack through the spray pipe network to insulate and extinguish the fire of the ship power battery; in the normal state, both valves are closed to realize pipeline vacuum isolation and prevent medium leakage.

[0064] The embodiment of the present application significantly simplifies the system structure by sharing the pipeline, reduces the number of pipelines and interfaces, reduces the space occupation and equipment weight, and adapts to the compact layout requirements of the ship battery cabin.

[0065] Further, when the liquid cooling system and the fire extinguishing agent spraying system share the pipeline, there is a risk of mixing of the cooling medium and the fire extinguishing medium. If the electromagnetic valve fails or malfunctions, the two media may mix in the pipeline, affecting the fire extinguishing effect. The traditional isolation measures (such as one-way valve) have insufficient reliability in the ship vibration environment, and are prone to sealing failure, which cannot effectively prevent the mutual leakage of the media. Therefore, a reliable isolation mechanism is needed to ensure that the two media are completely isolated in the normal working condition and only the fire extinguishing medium is allowed to pass through in the case of thermal runaway.

[0066] In one possible implementation, the fire extinguishing agent inlet end of the three-way mixer is provided with a fuse diaphragm which automatically ruptures to conduct the pipeline when the temperature exceeds a fuse threshold. Specifically, a PEEK (polyether ether ketone) fuse diaphragm is arranged at the fire extinguishing agent inlet end of the three-way mixer. The PEEK diaphragm has a specific melting point and can withstand a pressure difference of 2 MPa in normal state, effectively isolating the media in the liquid cooling pipeline and the fire extinguishing pipeline to prevent mixing of the cooling medium and the fire extinguishing medium. When a thermal runaway accident occurs, the PEEK material melts under heat, the PEEK diaphragm ruptures to form a spraying channel, at this time the insulating fire extinguishing agent enters the spray pipe network through the ruptured diaphragm and is sprayed into the battery pack to inhibit thermal runaway of the ship power battery.

[0067] The embodiment of the present application provides a reliable passive isolation guarantee for the fire extinguishing agent spraying system and the liquid cooling system sharing the pipeline, effectively prevents the mixing of the cooling medium and the fire extinguishing medium in the normal working condition, and ensures the independent operation of the two systems.

[0068] In another possible implementation, a cam structure is arranged between the first electromagnetic valve and the second electromagnetic valve, and the cam structure is used to forcibly close the second electromagnetic valve when the first electromagnetic valve is opened, and forcibly close the first electromagnetic valve when the second electromagnetic valve is opened. Specifically, the first electromagnetic valve and the second electromagnetic valve are mechanically interlocked through the cam mechanism. The cam mechanism is installed between the valve rods of the two electromagnetic valves. When the first electromagnetic valve is opened, the valve rod drives the cam to rotate, and the protruding part of the cam pushes the valve rod of the second electromagnetic valve, thereby forcibly keeping the second electromagnetic valve closed. Conversely, when the second electromagnetic valve is opened, the valve rod drives the cam to rotate in the opposite direction, and the protruding part of the cam pushes the valve rod of the first electromagnetic valve, thereby forcibly keeping the first electromagnetic valve closed. Further, the cam mechanism is made of high-strength alloy material, which can withstand the influence of ship vibration and temperature change, and ensure long-term reliable operation.

[0069] The embodiment of the present application ensures that the first electromagnetic valve and the second electromagnetic valve cannot be in an open state at the same time by arranging the cam mechanism mechanical linkage structure, and realizes the physical mutual exclusion of liquid cooling and fire extinguishing medium delivery.

[0070] The ship power battery pack is densely arranged by a plurality of battery modules. After a single module is in thermal runaway, it is easy to spread to adjacent modules through heat conduction, radiation and gas injection. When a thermal runaway accident occurs, even if the fire extinguishing agent is sprayed on the ship power battery, the heat suppression may be insufficient, leading to heat diffusion between the battery modules, and the accident range is easy to expand. Moreover, the closed cabin environment can aggravate gas accumulation and temperature rise, further accelerating the spread of thermal runaway.

[0071] In the embodiment of the present application, the method further comprises: acquiring the temperature of the adjacent battery module of the ship power battery; judging whether the temperature rise of the adjacent battery module reaches a preset temperature rise threshold based on the temperature of the adjacent battery module; if yes, spraying a second fire extinguishing agent into the cabin where the ship power battery is located, and performing battery cluster power cut-off operation and deck ventilation operation.

[0072] In a possible implementation, when a thermal accident occurs, a first fire extinguishing agent is sprayed on the battery pack corresponding to the ship power battery. After the spraying is completed, the liquid cooling system is started to perform liquid cooling. After a certain period of time, the temperature data of the adjacent battery module is collected, the temperature rise rate of the adjacent battery module is calculated, and if the temperature rise rate reaches a preset temperature rise rate, it is determined that heat diffusion may occur between the battery modules. A second fire extinguishing agent is immediately sprayed into the cabin where the ship power battery is located. The battery cluster main power supply is cut off at the same time to prevent the heat runaway from being aggravated by current conduction. The deck ventilation system is started to discharge the high-temperature gas and flammable gas in the cabin to the atmosphere, thereby reducing the temperature and gas concentration in the cabin to a safe range.

[0073] The embodiment of the present application effectively controls the cabin temperature and gas concentration through the linkage of the second fire extinguishing agent and the ventilation system, effectively solves the further spread of the thermal runaway accident when the first thermal inhibition operation has insufficient inhibition effect; and through the battery cluster power cut-off operation, the energy supply is prevented from the root, the influence range is greatly reduced, and the overall safety of the ship power battery is improved.

[0074] In order to avoid heat diffusion between adjacent battery modules, a fire-retardant isolation structure is usually arranged between adjacent battery modules. However, in a ship environment, the fire-retardant isolation structure is prone to fatigue failure under long-term vibration, resulting in an increase in the gap between the mica sheet and the module, the formation of a heat conduction path, and a weakening of the heat insulation effect. In addition, thermal expansion may cause damage to the isolation structure when a thermal runaway accident occurs, further exacerbating heat diffusion. Therefore, the present application also needs to provide a fire-retardant isolation structure that can adapt to the dynamic working conditions of a ship to ensure that it still has good heat insulation performance under conditions of inclination, vibration, and thermal expansion.

[0075] In the embodiment of the present application, a fire-retardant isolation structure is arranged between adjacent battery modules, and the fire-retardant isolation structure comprises: a mica sheet inserted into a slope clamping groove, a limiting stopper is arranged on a first side wall of the slope clamping groove, a silica gel pad is connected to a second side wall of the slope clamping groove through a limiting spring, and the silica gel pad elastically abuts against an end of the mica sheet.

[0076] In a possible implementation, the fire-retardant isolation structure uses a mica sheet as the core heat insulation material and realizes multiple fixations through a slope clamping groove, a spring pressing strip, a silica gel pad, and a limiting stopper. The mica sheet is inserted into the slope clamping groove and is self-locked by gravity, effectively preventing the mica sheet from falling out when the ship is inclined. A limiting stopper with a height of 8 mm is arranged on one side of the slope clamping groove, which limits the lateral displacement of the mica sheet and keeps the mica sheet stable in the horizontal direction. The other side of the slope clamping groove is connected to a silica gel pad through a limiting spring, wherein the compression rate of the silica gel pad is 30%±3%, the silica gel pad elastically abuts against the end of the mica sheet, and can provide continuous pre-tightening force to compensate for the gap caused by ship vibration. At the same time, the silica gel pad can also absorb the thermal expansion and vibration displacement of the battery to prevent the mica sheet from being damaged due to stress concentration. In addition, a spring pressing strip with a pre-tightening force of 50N±5N is arranged, which provides additional longitudinal pre-tightening force and further enhances the adhesion of the mica sheet to the module, thereby ensuring the integrity of the heat insulation layer and forming a reliable fire-retardant isolation structure.

[0077] The improved fireproof isolation structure of the embodiment can effectively adapt to the tilting, vibration and thermal expansion working conditions of the ship. The gravity self-locking slope clamping groove design prevents the risk of slipping when tilting. The elastic compensation function of the spring pressing strip and the silica gel pad absorbs the displacement caused by vibration and thermal expansion, avoiding structural damage. The reliable fixation of the mica sheet ensures that the heat conduction path between the modules is effectively blocked, delaying the spread speed of thermal runaway.

[0078] Further, in order to adapt to the working conditions of the ship (ship tilting ± 15°), in the embodiment of the application, the inclination angle of the slope clamping groove is set to 17°. The 17° slope clamping groove inclination angle forms a 2° safety margin with the maximum inclination angle of 15° of the cabin, and through the gravity self-locking effect, the mica sheet has no risk of falling out under dynamic working conditions such as ship tilting and rocking.

[0079] Correspondingly, please refer to Figure 2 The application provides a kind of linkage inhibition device of ship power battery overcharge thermal runaway, the device includes: data acquisition module, for obtaining the multidimensional sensing data of ship power battery;Thermal runaway analysis module is connected the data acquisition module, for the multidimensional sensing data is executed thermal runaway analysis, generates analysis result;Environment interference verification module is connected the thermal runaway analysis module, for when the analysis result is characterized as thermal runaway risk, ship environment interference verification is executed, generates interference verification result;Control execution module is connected the thermal runaway analysis module and the environment interference verification module, for: if the analysis result is characterized as thermal runaway accident, executes first thermal inhibition operation;If the analysis result is characterized as thermal runaway risk: based on the interference verification result judges whether there is thermal runaway accident;If there is the thermal runaway accident, executes the first thermal inhibition operation;If there is no thermal runaway accident, based on the multidimensional sensing data executes corresponding second thermal inhibition operation.

[0080] In addition, the application also provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to realize the method provided by the embodiment of the application.

[0081] The above describes the optional implementation of the embodiment of the application in detail in combination with the drawings, but the embodiment of the application is not limited to the specific details in the above implementation, and various simple modifications can be made to the technical solution of the embodiment of the application within the technical concept range of the embodiment of the application, and these simple modifications all belong to the protection range of the embodiment of the application.

[0082] In addition, it should be noted that each specific technical feature described in the above specific implementation can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the embodiment of the application.

[0083] Those skilled in the art can understand that all or part of the steps of the method in the above-mentioned embodiments can be completed by programs instructing the relevant hardware, the programs are stored in a storage medium, and the programs include a plurality of instructions for enabling a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in various embodiments of the present application. The foregoing storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk and various storage media capable of storing program codes.

[0084] In addition, various different embodiments of the embodiments of the present application can also be combined arbitrarily, as long as they do not deviate from the idea of the embodiments of the present application, and they should also be considered as disclosed in the embodiments of the present application.

Claims

1. A method for suppressing thermal runaway due to overcharging of a ship's power battery, characterized in that, include: Acquire multi-dimensional sensing data of marine power batteries; Perform thermal runaway analysis on the multi-dimensional sensor data and generate analysis results; If the analysis results indicate the presence of a thermal runaway accident, perform the first thermal suppression operation; If the analysis results indicate a risk of thermal runaway, perform a ship environmental disturbance verification and generate the disturbance verification results. Based on the interference verification results, determine whether the thermal runaway accident exists: If the thermal runaway accident occurs, perform the first thermal suppression operation; If the thermal runaway accident does not occur, the corresponding second thermal suppression operation is performed based on the multi-dimensional sensor data. The multi-dimensional sensing data includes temperature data, gas concentration data, and ultraviolet characteristic data. The thermal runaway analysis performed on the multi-dimensional sensing data generates analysis results, including: The temperature rise rate is determined based on the temperature data; Determine whether the temperature rise rate is greater than the first rate value; If the temperature rise rate is greater than the first rate value, the duration is obtained, and if the duration is greater than a preset time threshold, it is determined that the first thermal runaway condition is met. The concentration increase rate is determined based on the gas concentration data; Determine whether the concentration increase rate is greater than the second rate value; If the concentration increase rate is greater than the second rate value, it is determined that the second thermal runaway condition is met. The corresponding microspark energy is determined based on the aforementioned ultraviolet characteristic data; Determine whether the energy of the micro-spark is greater than a preset energy threshold; If the microspark energy is greater than the preset energy threshold, it is determined that the third thermal runaway condition is met; Determine whether the first thermal runaway condition, the second thermal runaway condition, and the third thermal runaway condition are simultaneously met; If all three thermal runaway conditions are met simultaneously, an analysis result indicating a thermal runaway accident is generated. Otherwise, an analysis result with a risk of thermal runaway will be generated.

2. The method for suppressing overcharge thermal runaway of a ship's power battery according to claim 1, characterized in that, The multi-dimensional sensing data also includes tilt data and vibration data, and the method further includes: Dynamic correction processing is performed on the tilt data to obtain the corrected tilt angle; The gas concentration data is corrected based on the corrected tilt angle to obtain the corrected concentration data. Determine whether the vibration data meets the preset host vibration trigger frequency and / or wave vibration trigger frequency; If so, perform adaptive Kalman filtering on the temperature data to obtain processed temperature data; Thermal runaway analysis is performed based on the corrected concentration data, the processed temperature data, and the ultraviolet characteristic data to generate analysis results.

3. The method for suppressing overcharge thermal runaway of a ship's power battery according to claim 1, characterized in that, The execution of the first thermal suppression operation includes: Determine the short-circuit voltage of the ship's power battery; Determine the primary extinguishing agent and the initial insulation enhancer; The addition ratio of the initial insulation enhancer in the first extinguishing agent is determined based on the short-circuit voltage. An insulating fire extinguishing agent is prepared based on the initial insulating reinforcing agent, the addition ratio, and the first fire extinguishing agent; The corresponding fire extinguishing agent spraying operation is performed based on the insulating fire extinguishing agent.

4. The method for suppressing overcharge thermal runaway of a ship's power battery according to claim 3, characterized in that, The multi-dimensional sensing data also includes battery voltage data and pressure relief valve status data. The process of performing ship environmental interference verification and generating interference verification results includes: Based on the battery voltage data, it is determined whether the voltage drop of the ship's power battery reaches a preset voltage drop threshold within a preset time. If the voltage drop reaches the preset voltage drop threshold within the preset time, a first criterion is generated; If the duration is greater than the preset time threshold, a second criterion is generated; If the pressure relief valve status data indicates that the pressure relief valve has been opened, a third criterion is generated; If the first criterion, the second criterion, and the third criterion are obtained, an interference verification result unaffected by environmental interference is generated; If at least one of the first criterion, the second criterion, and the third criterion is not obtained, an interference verification result due to environmental interference is generated.

5. The method for suppressing overcharge thermal runaway of a ship's power battery according to claim 4, characterized in that, The method further includes: Obtain charging voltage data; Extract abnormal voltage drop data from the charging voltage data; The battery voltage data is corrected based on the abnormal voltage drop data to generate corrected voltage data; Based on the corrected voltage data, it is determined whether the voltage drop of the ship's power battery within a preset time reaches a preset voltage drop threshold.

6. The method for suppressing overcharge thermal runaway of a ship's power battery according to claim 1, characterized in that, The execution of the corresponding second thermal suppression operation based on the multi-dimensional sensing data includes: If any two of the first thermal runaway condition, the second thermal runaway condition, and the third thermal runaway condition are met, the charging circuit is cut off and an audible and visual alarm is triggered. If any one of the first thermal runaway condition, the second thermal runaway condition, and the third thermal runaway condition is met, the liquid cooling system is activated to perform a current-limited charging operation on the ship's power battery.

7. A method for suppressing overcharge thermal runaway of a ship's power battery according to any one of claims 1-6, characterized in that, The method further includes: Obtain the temperature of adjacent battery modules of the ship's power battery; Based on the temperature of the adjacent battery modules, determine whether the temperature rise of the adjacent battery modules has reached the preset temperature rise threshold. If so, spray a second fire extinguishing agent into the cabin where the ship's power battery is located, and perform battery cluster power cut-off and deck ventilation operations.

8. A linkage suppression device for overcharge thermal runaway of a ship's power battery, characterized in that, The device includes: The data acquisition module is used to acquire multi-dimensional sensor data of the ship's power battery; A thermal runaway analysis module, connected to the data acquisition module, is used to perform thermal runaway analysis on the multi-dimensional sensor data and generate analysis results. An environmental disturbance verification module, connected to the thermal runaway analysis module, is used to perform ship environmental disturbance verification and generate disturbance verification results when the analysis results indicate a risk of thermal runaway. The control execution module, connected to the thermal runaway analysis module and the environmental disturbance verification module, is used for: If the analysis results indicate a thermal runaway accident, perform the first thermal suppression operation; If the analysis results indicate a risk of thermal runaway: Based on the interference verification results, determine whether a thermal runaway accident exists; If the thermal runaway accident occurs, perform the first thermal suppression operation; If the thermal runaway accident does not occur, the corresponding second thermal suppression operation is performed based on the multi-dimensional sensor data. The multi-dimensional sensing data includes temperature data, gas concentration data, and ultraviolet characteristic data. The thermal runaway analysis module is specifically used for: The temperature rise rate is determined based on the temperature data; Determine whether the temperature rise rate is greater than the first rate value; If the temperature rise rate is greater than the first rate value, the duration is obtained, and if the duration is greater than a preset time threshold, it is determined that the first thermal runaway condition is met. The concentration increase rate is determined based on the gas concentration data; Determine whether the concentration increase rate is greater than the second rate value; If the concentration increase rate is greater than the second rate value, it is determined that the second thermal runaway condition is met. The corresponding microspark energy is determined based on the aforementioned ultraviolet characteristic data; Determine whether the energy of the micro-spark is greater than a preset energy threshold; If the microspark energy is greater than the preset energy threshold, it is determined that the third thermal runaway condition is met; Determine whether the first thermal runaway condition, the second thermal runaway condition, and the third thermal runaway condition are simultaneously met; If all three thermal runaway conditions are met simultaneously, an analysis result indicating a thermal runaway accident is generated. Otherwise, an analysis result with a risk of thermal runaway will be generated.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the method described in any one of claims 1-7.

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