Power battery disassembly fire early warning method and device

Abstract

The invention relates to the technical field of power batteries, and discloses a power battery disassembly fire early warning method and device, and the method comprises the steps: recording a disassembly video and a real-time disassembly temperature in real time in the disassembly process of a power battery; acquiring a current image frame corresponding to the current moment and a plurality of previous image frames before the current moment from the disassembled video; calculating a fire behavior change rate at the current moment based on the current image frame and the plurality of previous image frames; and determining a fire behavior grade at the current moment based on the real-time disassembly temperature and the fire behavior change rate, and performing fire behavior early warning based on the fire behavior grade. According to the invention, the real-time data is taken as the basis of fire early warning, so that the timeliness of fire early warning can be effectively improved, and the safety of the power battery in the disassembly process is improved; fire behavior evaluation is performed in combination with various data, so that the accuracy of fire behavior early warning can be improved; by setting the fire behavior grade and performing corresponding fire behavior early warning based on the fire behavior grade, the comprehensiveness of fire behavior early warning can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular, to a method and device for early warning of fire in the disassembly of power batteries. Background Art

[0002] During the recycling of power batteries, during the disassembly of single cells, it is easy to occur situations such as shell deformation, short circuit between the positive and negative electrodes, and a large number of small discharge circuits formed by residual electricity for rapid energy release. When all the conditions for deflagration are met during the disassembly of a single power battery, the disassembled power battery is extremely likely to generate sparks or even deflagrate. Therefore, real-time monitoring, analysis, and detection of the phenomenon of local temperature rise and sparks during the disassembly process are the keys to ensuring safe disassembly, recycling, and utilization.

[0003] Existing safety guarantee measures mostly use traditional temperature sensors and smoke sensors to monitor and alarm the temperature value and smoke depth at the recycling operation site, and at the same time remind relevant operators to conduct fire fighting on site. However, the current safety guarantee measures need to wait until the on-site temperature rises sharply after a fire occurs, or a large amount of smoke is generated to reach a certain depth before the sensor alarm can be triggered. The characteristics of power battery fires are fast ignition speed, long duration, high combustion temperature, difficult to extinguish, long-term spontaneous combustion and even explosion. Applying traditional fire warning methods to power batteries will have the defect of lag, that is, the alarm will only be given after the disaster occurs, which will inevitably cause losses to related equipment and production. Summary of the Invention

[0004] The present invention provides a method and device for early warning of fire in the disassembly of power batteries, which can effectively improve the timeliness and accuracy of fire warning and improve the safety of power battery disassembly.

[0005] In order to solve the above technical problems, the present invention provides a method for early warning of fire in the disassembly of power batteries, including: During the disassembly process of the power battery, the disassembly video and the real-time disassembly temperature are recorded in real time; Obtain the current image frame corresponding to the current moment and a plurality of previous image frames before the current moment in the disassembly video; Based on the current image frame and the plurality of previous image frames, calculate the fire change rate at the current moment; Determine the fire level at the current moment based on the real-time disassembly temperature and the fire change rate, and conduct fire warning based on the fire level.

[0006] During the disassembly process of the power battery, this invention conducts fire warning by recording the disassembly video in real time and the real-time disassembly temperature. In the real-time recorded disassembly video, by obtaining the image frame at the current moment and several previous image frames before the current moment, and analyzing these obtained image frames, the fire situation change rate at the current moment can be calculated. Based on the real-time disassembly temperature and the fire situation change rate, the fire situation level corresponding to the current moment can be analyzed, and corresponding fire warning operations can be executed according to the fire situation level at the current moment. This invention uses the real-time recorded disassembly video and the real-time disassembly temperature as the basis for fire warning, which can effectively improve the timeliness of fire warning, thereby improving the safety of the power battery during the disassembly process; combining the disassembly temperature and the fire situation change rate for fire warning is to combine multiple data for fire situation assessment, which can improve the accuracy of fire warning; by setting the fire situation level and conducting corresponding fire warning based on the fire situation level, the comprehensiveness of fire warning can be improved.

[0007] Further, calculating the fire situation change rate at the current moment based on the current image frame and several previous image frames specifically includes: Calculating the fire area of the current image frame and several previous image frames respectively to form fire situation data; Based on the fire situation data, performing curve fitting to form a fire situation trend curve; Obtaining the current curvature at the current moment on the fire situation trend curve; Determining the current curvature as the fire situation change rate at the current moment.

[0008] This invention takes the fire area of the current image frame and several previous image frames as fire situation data, then uses the method of curve fitting to form a fire situation trend curve, and takes the curvature of the fire situation trend curve as the fire situation change rate; thus, when conducting fire warning, not only real-time data is considered, but historical data is also referred to for analysis. Taking the fire situation change rate as the basis for fire warning can effectively improve the accuracy of fire warning.

[0009] Further, determining the fire situation level at the current moment based on the real-time disassembly temperature and the fire situation change rate, and conducting fire warning based on the fire situation level specifically includes: When the real-time disassembly temperature is less than or equal to the first warning temperature, determining the fire situation level as the first level and generating a safety prompt; When the real-time disassembly temperature is greater than the first warning temperature, comparing the real-time disassembly temperature with the second warning temperature and the third warning temperature to form a comparison result, and determining the fire situation level at the current moment according to the comparison result and the fire situation change rate, and conducting fire warning based on the fire situation level; wherein, the second warning temperature is greater than the first warning temperature and less than or equal to the third warning temperature.

[0010] Further, when the real-time disassembly temperature is greater than the first warning temperature, compare the real-time disassembly temperature with the second warning temperature and the third warning temperature to form a comparison result, and determine the fire level at the current moment according to the comparison result and the fire change rate, and conduct a fire warning based on the fire level, specifically as follows: When the real-time disassembly temperature is greater than the first warning temperature, compare the real-time disassembly temperature with the second warning temperature and the third warning temperature; When the real-time disassembly temperature is greater than the first warning temperature and less than or equal to the second warning temperature, determine the fire level at the current moment according to the fire change rate, and conduct a fire warning based on the fire level; When the real-time disassembly temperature is greater than the second warning temperature and less than or equal to the third warning temperature, detect the disassembly area of the power battery, and determine the fire level at the current moment according to the fire change rate and the disassembly area, and conduct a fire warning based on the fire level; When the real-time disassembly temperature is greater than the third warning temperature, determine the fire level at the current moment according to the fire change rate, and conduct a fire warning based on the fire level.

[0011] Further, when the real-time disassembly temperature is greater than the first warning temperature and less than or equal to the second warning temperature, determine the fire level at the current moment according to the fire change rate, and conduct a fire warning based on the fire level, specifically as follows: When the real-time disassembly temperature is greater than the first warning temperature and less than or equal to the second warning temperature, compare the fire change rate with a preset change rate warning value; When the fire change rate is less than or equal to the change rate warning value, determine that the fire level at the current moment is the second level, and generate a attention prompt; When the fire change rate is greater than the change rate warning value, determine that the fire level at the current moment is the third level, and generate a warning prompt.

[0012] Further, when the real-time disassembly temperature is greater than the second warning temperature and less than or equal to the third warning temperature, detect the disassembly area of the power battery, and determine the fire level at the current moment according to the fire change rate and the disassembly area, and conduct a fire warning based on the fire level, specifically as follows: When the real-time disassembly temperature is greater than the second warning temperature and less than or equal to the third warning temperature, detect the disassembly area of the power battery; When the disassembly area is in a preset warning area, determine that the fire level at the current moment is the second level, and generate a attention prompt; When the disassembly area is not in the preset warning area, determine the fire level at the current moment according to the fire change rate, and conduct fire warning based on the fire level.

[0013] Further, when the disassembly area is not in the preset warning area, determine the fire level at the current moment according to the fire change rate, and conduct fire warning based on the fire level, specifically: When the disassembly area is not in the preset warning area, compare the fire change rate with the preset change rate warning value; When the fire change rate is less than or equal to the change rate warning value, determine that the fire level at the current moment is the third level, and generate a warning prompt; When the fire change rate is greater than the change rate warning value, determine that the fire level at the current moment is the fourth level, and generate a danger prompt.

[0014] Further, when the real-time disassembly temperature is greater than the third warning temperature, determine the fire level at the current moment according to the fire change rate, and conduct fire warning based on the fire level, specifically: When the real-time disassembly temperature is greater than the third warning temperature, compare the fire change rate with the preset change rate warning value; When the fire change rate is less than or equal to the change rate warning value, determine that the fire level at the current moment is the fifth level, and generate a very dangerous prompt; When the fire change rate is greater than the change rate warning value, determine that the fire level at the current moment is the sixth level, and generate an ignition prompt.

[0015] Further, the method for warning the fire of power battery disassembly further includes: Before disassembling the power battery, detect the change in the open-circuit state voltage of the power battery within a preset detection time to form voltage detection data; Analyze the remaining power and safety level of the power battery based on the voltage detection data; Judge whether the power battery can be safely disassembled according to the remaining power and the safety level; If it is judged that the power battery can be safely disassembled, disassemble the power battery.

[0016] Before disassembling the power battery, the present invention analyzes the remaining power and safety level of the power battery by detecting the change in the open-circuit state voltage of the power battery within a preset detection time, and determines whether the power battery can be safely disassembled based on the remaining power and safety level of the power battery. Only when it is determined that the power battery can be safely disassembled, it is disassembled. The present invention performs a safety judgment on the power battery before disassembling it, which can effectively prevent fires and thus improve the safety of fire warning.

[0017] Correspondingly, the present invention provides a fire warning device for disassembling a power battery, including: a real-time monitoring module, an image acquisition module, a fire data acquisition module, and a fire warning module; The real-time monitoring module is used to record the disassembly video and the real-time disassembly temperature in real time during the disassembly process of the power battery; The image acquisition module is used to acquire the current image frame corresponding to the current moment and several previous image frames before the current moment in the disassembly video; The fire data acquisition module is used to calculate the fire change rate at the current moment based on the current image frame and several previous image frames; The fire warning module is used to determine the fire level at the current moment based on the real-time disassembly temperature and the fire change rate, and perform a fire warning based on the fire level. Description of the Drawings

[0018] Figure 1 It is a schematic flowchart of an embodiment of the fire warning method for disassembling a power battery provided by the present invention; Figure 2 It is a schematic flowchart of another embodiment of the fire warning method for disassembling a power battery provided by the present invention; Figure 3 It is a schematic flowchart of still another embodiment of the fire warning method for disassembling a power battery provided by the present invention; Figure 4 It is a schematic structural diagram of an embodiment of the fire warning device for disassembling a power battery provided by the present invention. Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0020] The flowcharts shown in the accompanying drawings are only illustrative examples, not necessarily including all content and operations / steps, nor necessarily executed in the described order. For example, some operations / steps can be decomposed, combined, or partially merged, so the actual execution order may change according to the actual situation.

[0021] The following will, with reference to the accompanying drawings, elaborate on some embodiments of the present invention. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0022] Embodiment 1 As Figure 1 shown, it is a schematic flowchart of an embodiment of the method for early warning of fire in the disassembly of power batteries provided by the present invention. This method includes steps 101 to 104, and the specific steps are as follows: Step 101: During the disassembly process of the power battery, record the disassembly video and the real-time disassembly temperature in real time.

[0023] Step 102: Obtain the current image frame corresponding to the current moment and several previous image frames before the current moment in the disassembly video.

[0024] Step 103: Calculate the fire change rate at the current moment based on the current image frame and several of the previous image frames.

[0025] Step 104: Determine the fire level at the current moment based on the real-time disassembly temperature and the fire change rate, and conduct early warning of fire based on the fire level.

[0026] In the embodiment of the present invention, during the disassembly process of the power battery, early warning of fire is carried out by recording the disassembly video and the real-time disassembly temperature in real time. Among them, a thermal infrared thermal imager or a thermal infrared sensor can collect the disassembly temperature in real time during the disassembly process of the power battery to form the real-time disassembly temperature. An infrared camera can obtain the change process of the temperature field over time through continuous video acquisition technology to form the disassembly video.

[0027] The present invention uses the real-time recorded disassembly video and the real-time disassembly temperature as the basis for early warning of fire, which can effectively improve the timeliness of early warning of fire, thereby improving the safety of power batteries during the disassembly process.

[0028] In an embodiment of the present invention, in the disassembling video recorded in real time, by obtaining the image frame at the current moment and several previous image frames before the current moment, and analyzing these obtained image frames, the fire change rate at the current moment can be calculated. Among them, the image frames obtained in the disassembling video contain the fire data corresponding to that moment. By combining the current moment and multiple image frames before the current moment, the fire change rate of the current moment frame can be obtained by comparing the fire data, so as to obtain the fire change rate indicating the fire change trend. According to this fire change rate, the fire warning operation that needs to be carried out at the current moment can be accurately judged.

[0029] In an embodiment of the present invention, by combining the real-time disassembling temperature and the fire change rate, the fire level corresponding to the current moment can be analyzed, and the corresponding fire warning operation can be executed according to the fire level at the current moment. Therefore, by combining multiple data such as the disassembling temperature and the fire change rate for fire warning, the accuracy of fire warning can be effectively improved. In addition, by setting the fire level and performing different corresponding fire warnings based on the fire level, the comprehensiveness of fire warning can be improved.

[0030] In summary, the embodiment of the present invention provides a method for warning of fire in the disassembly of power batteries. During the disassembly process of the power battery, the disassembly video and the real-time disassembly temperature are recorded in real time; the current image frame corresponding to the current moment and several previous image frames before the current moment are obtained in the disassembly video; based on the current image frame and several previous image frames, the fire change rate at the current moment is calculated; based on the real-time disassembly temperature and the fire change rate, the fire level at the current moment is determined, and a fire warning is carried out based on the fire level. The present invention uses real-time data as the basis for fire warning, can effectively improve the timeliness of fire warning, thereby improving the safety of power batteries during the disassembly process; combining multiple data for fire assessment can improve the accuracy of fire warning; by setting the fire level and performing corresponding fire warnings based on the fire level, the comprehensiveness of fire warning can be improved.

[0031] Embodiment 2 As Figure 1 shown, it is a schematic flowchart of an embodiment of the method for warning of fire in the disassembly of power batteries provided by the present invention. The method includes steps 101 to 104, and the specific steps are as follows: Step 101: During the disassembly process of the power battery, record the disassembly video and the real-time disassembly temperature in real time.

[0032] Since the power battery will carry a certain amount of electricity. When starting to cut the battery, the ejection of substances such as electrolyte and the instantaneous release of electrical energy cause a small amount of sparks to appear at the cut. During the cutting process, the metal chips flying into the battery interior and the damage of the battery partition lead to local short-circuit phenomena. The rapid release of electrical energy inside the battery causes the battery to heat up. The accumulation of a large amount of heat causes the temperature inside the battery to rise, which will cause the battery to release smoke containing combustible gases such as CO, CO2, H2, CH4, and C2H4. Different phenomena will occur according to the degree of temperature rise and the duration. For example, when the temperature continues to rise, the smoke released by the battery will gradually increase from a small amount; when the temperature remains unchanged, the amount of smoke released by the battery will also remain unchanged continuously; when the temperature gradually decreases, the amount of smoke released by the battery will gradually decrease. The smoke released by the battery combines with the oxygen in the air and may thus be ignited by the high-temperature battery, resulting in a combustion phenomenon. Therefore, through analysis, it can be seen that continuous smoke release, air, and the battery temperature rising to the ignition level are the conditions for ignition during the disassembly process of the power battery.

[0033] In the embodiment of the present invention, since the power battery catches fire during cutting, it will experience a small amount of smoking, a large amount of smoking, the battery temperature rising to the ignition temperature, and combustion. In order to monitor whether the power battery will burn during the disassembly process, it can be judged by the amount of smoke and the smoke temperature. And the amount of smoke can be obtained from the disassembly video recorded in real time during the disassembly process of the power battery. Therefore, recording the disassembly video and the disassembly temperature in real time can effectively judge the fire situation at the current moment.

[0034] In the embodiment of the present invention, a thermal infrared thermal imager or a thermal infrared sensor can collect the disassembly temperature in real time during the disassembly process of the power battery to form a real-time disassembly temperature. The infrared camera can obtain the change process of the temperature field over time through continuous video acquisition technology to form a disassembly video.

[0035] The present invention uses the real-time recorded disassembly video and the real-time disassembly temperature as the basis for fire warning, which can effectively improve the timeliness of fire warning, thereby improving the safety of the power battery during the disassembly process.

[0036] Step 102: Obtain the current image frame corresponding to the current moment and a plurality of previous image frames before the current moment in the disassembly video.

[0037] Step 103: Calculate the fire change rate at the current moment based on the current image frame and the plurality of previous image frames.

[0038] In an embodiment of the present invention, in the disassembling video recorded in real time, by obtaining the image frame at the current moment and several previous image frames before the current moment, and analyzing these obtained image frames, the fire situation change rate at the current moment can be calculated. Among them, the image frames obtained in the disassembling video contain the fire situation data corresponding to that moment. By combining the current moment and multiple image frames before the current moment, the fire situation change rate of the current moment frame can be obtained by comparing the fire situation data, so as to obtain the fire situation change rate representing the fire situation change trend. According to this fire situation change rate, the fire situation early warning operation to be performed at the current moment can be accurately judged.

[0039] Further, in an embodiment of the present invention, based on the current image frame and several of the previous image frames, the fire situation change rate at the current moment is calculated, specifically as follows: Calculate the fire situation areas of the current image frame and several of the previous image frames respectively to form fire situation data; Based on the fire situation data, perform curve fitting to form a fire situation trend curve; Obtain the current curvature at the current moment on the fire situation trend curve; Determine the current curvature as the fire situation change rate at the current moment.

[0040] In an embodiment of the present invention, after obtaining the current image frame and multiple previous image frames, the fire situation areas of each image frame can be calculated to form fire situation data. And the fire situation area of each image frame can be calculated by using a pre-trained fire situation development model. The fire situation development model can be constructed based on the LSTM model, and the historical fire situation image frames are used for model training. Specifically, the feature points representing smoke in the historical fire situation image frames are marked, the LSTM model is trained to extract the smoke feature points in the historical fire situation image frames, and the smoke amount is calculated based on these feature points. When the fire situation development model is trained, the smoke amount calculated by the fire situation development model can be determined as the fire situation area.

[0041] In an embodiment of the present invention, after obtaining the fire situation areas of each image frame, the fire situation areas corresponding to the moments of each image frame are associated to form fire situation data. A coordinate system with time as the horizontal axis and fire situation area as the vertical axis is constructed. Based on the fire situation data, curve fitting can form a fire situation trend curve, and the current curvature at the current moment obtained on this fire situation trend curve is determined as the fire situation change rate at the current moment.

[0042] Step 104: Determine the fire situation level at the current moment based on the real-time disassembling temperature and the fire situation change rate, and perform fire situation early warning based on the fire situation level.

[0043] In an embodiment of the present invention, by combining the real-time disassembly temperature and the fire rate of change, the fire level corresponding to the current moment can be analyzed, and the corresponding fire warning operation can be performed according to the fire level at the current moment. Therefore, by combining multiple aspects of data such as the disassembly temperature and the fire rate of change for fire warning, the accuracy of fire warning can be effectively improved. In addition, by setting the fire level and performing different corresponding fire warnings based on the fire level, the comprehensiveness of fire warning can be improved.

[0044] Further, in an embodiment of the present invention, based on the real-time disassembly temperature and the fire rate of change, the fire level at the current moment is determined, and a fire warning is performed based on the fire level. Specifically: When the real-time disassembly temperature is less than or equal to the first warning temperature, the fire level is determined to be the first level, and a safety prompt is generated; When the real-time disassembly temperature is greater than the first warning temperature, the real-time disassembly temperature is compared with the second warning temperature and the third warning temperature to form a comparison result, and the fire level at the current moment is determined according to the comparison result and the fire rate of change, and a fire warning is performed based on the fire level; wherein, the second warning temperature is greater than the first warning temperature and less than or equal to the third warning temperature.

[0045] Further, in an embodiment of the present invention, when the real-time disassembly temperature is greater than the first warning temperature, the real-time disassembly temperature is compared with the second warning temperature and the third warning temperature to form a comparison result, and the fire level at the current moment is determined according to the comparison result and the fire rate of change, and a fire warning is performed based on the fire level. Specifically: When the real-time disassembly temperature is greater than the first warning temperature, the real-time disassembly temperature is compared with the second warning temperature and the third warning temperature; When the real-time disassembly temperature is greater than the first warning temperature and less than or equal to the second warning temperature, the fire level at the current moment is determined according to the fire rate of change, and a fire warning is performed based on the fire level; When the real-time disassembly temperature is greater than the second warning temperature and less than or equal to the third warning temperature, the disassembly area of the power battery is detected, and the fire level at the current moment is determined according to the fire rate of change and the disassembly area, and a fire warning is performed based on the fire level; When the real-time disassembly temperature is greater than the third warning temperature, the fire level at the current moment is determined according to the fire rate of change, and a fire warning is performed based on the fire level.

[0046] Further, in the embodiments of the present invention, when the real-time disassembly temperature is greater than the first warning temperature and less than or equal to the second warning temperature, the fire situation level at the current moment is determined according to the fire situation change rate, and fire situation warning is carried out based on the fire situation level. Specifically: When the real-time disassembly temperature is greater than the first warning temperature and less than or equal to the second warning temperature, compare the fire situation change rate with a preset change rate warning value; When the fire situation change rate is less than or equal to the change rate warning value, determine that the fire situation level at the current moment is the second level, and generate a attention prompt; When the fire situation change rate is greater than the change rate warning value, determine that the fire situation level at the current moment is the third level, and generate a warning prompt.

[0047] Further, in the embodiments of the present invention, when the real-time disassembly temperature is greater than the second warning temperature and less than or equal to the third warning temperature, detect the disassembly area of the power battery, and determine the fire situation level at the current moment according to the fire situation change rate and the disassembly area, and carry out fire situation warning based on the fire situation level. Specifically: When the real-time disassembly temperature is greater than the second warning temperature and less than or equal to the third warning temperature, detect the disassembly area of the power battery; When the disassembly area is in a preset warning area, determine that the fire situation level at the current moment is the second level, and generate a attention prompt; When the disassembly area is not in the preset warning area, determine the fire situation level at the current moment according to the fire situation change rate, and carry out fire situation warning based on the fire situation level.

[0048] Further, in the embodiments of the present invention, when the disassembly area is not in the preset warning area, determine the fire situation level at the current moment according to the fire situation change rate, and carry out fire situation warning based on the fire situation level. Specifically: When the disassembly area is not in the preset warning area, compare the fire situation change rate with a preset change rate warning value; When the fire situation change rate is less than or equal to the change rate warning value, determine that the fire situation level at the current moment is the third level, and generate a warning prompt; When the fire situation change rate is greater than the change rate warning value, determine that the fire situation level at the current moment is the fourth level, and generate a danger prompt.

[0049] Further, in the embodiments of the present invention, when the real-time disassembly temperature is greater than the third warning temperature, determine the fire situation level at the current moment according to the fire situation change rate, and carry out fire situation warning based on the fire situation level. Specifically: When the real-time disassembly temperature is greater than the third warning temperature, compare the fire situation change rate with a preset change rate warning value; When the fire situation change rate is less than or equal to the change rate warning value, determine that the fire situation level at the current moment is the fifth level, and generate a very dangerous prompt; When the fire situation change rate is greater than the change rate warning value, determine that the fire situation level at the current moment is the sixth level, and generate an ignition prompt.

[0050] As an example of an embodiment of the present invention, see Figure 2 , which is a schematic flowchart of another embodiment of the method for warning of fire in the disassembly of power batteries provided by the present invention. Set the first warning temperature to 40 °C, the second warning temperature to 100 °C, and the third warning temperature to 150 °C. At room temperature, the overall temperature is less than 40 °C, and at this time, it can be considered to be in a safe state. When disassembling the power battery, the temperature of the grinding wheel will be maintained at 100 °C to 150 °C, causing the temperature of the battery cross-section to rise. At this time, it can be considered that it is the beginning of the heat release of the power battery during the cutting process. During the cutting process or at the end of cutting, if the power battery releases heat slightly, slight smoke will appear locally, and the smoke temperature is in the range of 40 °C to 100 °C. During the cutting process or at the end of cutting, if the heat of the power battery continues to rise and a large amount of heat is released, jet-like smoke will appear locally, and the smoke temperature is greater than 150 °C; at this time, the smoke temperature has reached the ignition condition of combustible gas and is in a dangerous state. Therefore, 40 °C, 100 °C, and 150 °C can be used as the three warning temperatures.

[0051] During the disassembly process of the power battery, record the real-time disassembly temperature in real time, and perform the following analysis of the fire situation level according to different real-time disassembly temperatures: If the real-time disassembly temperature is less than or equal to 40 °C, it belongs to the first level at this time, and a safety prompt is given.

[0052] If there is an area where the real-time disassembly temperature is in the range of 40 °C to 100 °C, calculate the fire situation area of the current image frame and the fire situation areas of the previous five frames, perform curve fitting based on these fire situation area data to form a fire situation trend curve, and the curvature on the fire situation trend curve can judge whether the fire situation trend is rising or falling, and the speed of change of the fire situation trend. Set the change rate warning value to 10. Then, when the absolute value of the curvature is greater than 10, it belongs to the third level at this time, and a warning prompt is given; when the absolute value of the curvature is less than or equal to 10, it belongs to the second level at this time, and a attention prompt is given.

[0053] If there is an area where the real-time disassembly temperature is in the range of 100°C to 150°C, first determine the area where the real-time disassembly temperature is located. If the real-time disassembly temperature occurs on the grinding wheel, it belongs to the second level at this time, and a prompt to pay attention is given. If the real-time disassembly temperature does not occur on the grinding wheel, then calculate the fire area of the current image frame and the fire areas of the previous five frames, perform curve fitting based on these fire area data to form a fire trend curve, and the curvature on the fire trend curve can judge whether the fire trend is rising or falling, and the speed of change of the fire trend. Set the change rate warning value to 10. When the absolute value of the curvature is greater than 10, it belongs to the fourth level at this time, and a danger prompt is given; when the absolute value of the curvature is less than or equal to 10, it belongs to the third level at this time, and a warning prompt is given.

[0054] If there is an area where the real-time disassembly temperature is greater than 150°C, then calculate the fire area of the current image frame and the fire areas of the previous five frames, perform curve fitting based on these fire area data to form a fire trend curve, and the curvature on the fire trend curve can judge whether the fire trend is rising or falling, and the speed of change of the fire trend. Set the change rate warning value to 10. Then when the absolute value of the curvature is greater than 10, it belongs to the sixth level at this time, and an ignition prompt is given; when the absolute value of the curvature is less than or equal to 10, it belongs to the fifth level at this time, and a very dangerous prompt is given.

[0055] The present invention classifies the fire levels into six levels: safe, attention, warning, danger, very dangerous, and ignition, and performs corresponding fire warnings based on the fire levels, which can improve the comprehensiveness of fire warnings.

[0056] Furthermore, in the embodiment of the present invention, the method for warning of fire in the disassembly of power batteries further includes: Before disassembling the power battery, detect the change in the open-circuit state voltage of the power battery within a preset detection time to form voltage detection data; Analyze the remaining power and safety level of the power battery based on the voltage detection data; Judge whether the power battery can be safely disassembled according to the remaining power and the safety level; If it is judged that the power battery can be safely disassembled, then disassemble the power battery.

[0057] In the embodiment of the present invention, before disassembling the power battery, by detecting the change in the open-circuit state voltage of the power battery within a preset detection time, analyzing the remaining power and safety level of the power battery, and judging whether the power battery can be safely disassembled based on the remaining power and safety level of the power battery, and only when it is determined that the power battery can be safely disassembled, disassemble it. The present invention first judges the safety of the power battery before disassembling the power battery, which can effectively prevent the occurrence of fires and thus improve the safety of fire warnings.

[0058] As an example of an embodiment of the present invention, refer to Figure 3 which is a schematic flowchart of another embodiment of the method for warning of fire during the disassembly of a power battery provided by the present invention. Before disassembling the power battery, the remaining power and safety level of the power battery are first tested and evaluated. Specifically: a 1-ohm resistor is used to control the power battery to maintain an open circuit state for more than 10S, and at the same time, the voltage change within 10S is measured. If the open-circuit voltage of the power battery is always 0 within 10S, the internal circuit of the power battery is short-circuited, and the power of the power battery cannot be estimated, and it is determined that the power battery cannot be disassembled. If the initial open-circuit voltage of the power battery is greater than 3V within 10S, there is a relatively large amount of remaining power inside the power battery, and it is determined that the power battery cannot be disassembled. If the initial open-circuit voltage of the power battery is greater than 2V and less than 3V within 10S, and the voltage after discharging for 10S is greater than 1V, there is a relatively large amount of remaining power inside the power battery, and it is determined that the power battery cannot be disassembled. If the initial open-circuit voltage of the power battery is greater than 2V and less than 3V within 10S, and the voltage after discharging for 10S is less than 1V, the open-circuit state of the power battery is maintained for 30S and then the voltage is measured. If the voltage for 30S is less than 1.5V, it is determined that the power battery can be safely cut. If the initial open-circuit voltage of the power battery is less than 2V within 10S, and the voltage after discharging for 2S is less than 1V, it is determined that the power battery can be safely cut.

[0059] In summary, the embodiment of the present invention provides a method for warning of fire during the disassembly of a power battery. During the disassembly process of the power battery, the disassembly video and the real-time disassembly temperature are recorded in real time; the current image frame corresponding to the current moment and several previous image frames before the current moment are obtained from the disassembly video; based on the current image frame and several previous image frames, the fire change rate at the current moment is calculated; based on the real-time disassembly temperature and the fire change rate, the fire level at the current moment is determined, and a fire warning is carried out based on the fire level. The present invention uses real-time data as the basis for fire warning, which can effectively improve the timeliness of fire warning and thus improve the safety of the power battery during the disassembly process; combining multiple data for fire assessment can improve the accuracy of fire warning; by setting the fire level and carrying out corresponding fire warnings based on the fire level, the comprehensiveness of fire warning can be improved.

[0060] Embodiment 3 Refer to Figure 4 which is a schematic structural diagram of an embodiment of a device for warning of fire during the disassembly of a power battery provided by the present invention. The device includes a real-time monitoring module 201, an image acquisition module 202, a fire data acquisition module 203, and a fire warning module 204; The real-time monitoring module 201 is used to record the disassembly video and the real-time disassembly temperature in real time during the disassembly process of the power battery; The image acquisition module 202 is used to acquire the current image frame corresponding to the current moment and several previous image frames before the current moment in the disassembly video; The fire data acquisition module 203 is used to calculate the fire change rate at the current moment based on the current image frame and several previous image frames; The fire warning module 204 is used to determine the fire level at the current moment based on the real-time disassembly temperature and the fire change rate, and perform fire warning based on the fire level.

[0061] Further, in the embodiment of the present invention, calculating the fire change rate at the current moment based on the current image frame and several previous image frames specifically includes: Calculating the fire areas of the current image frame and several previous image frames respectively to form fire data; Performing curve fitting based on the fire data to form a fire trend curve; Obtaining the current curvature at the current moment on the fire trend curve; Determining the current curvature as the fire change rate at the current moment.

[0062] Further, in the embodiment of the present invention, determining the fire level at the current moment based on the real-time disassembly temperature and the fire change rate, and performing fire warning based on the fire level specifically includes: When the real-time disassembly temperature is less than or equal to the first warning temperature, determining the fire level as the first level and generating a safety prompt; When the real-time disassembly temperature is greater than the first warning temperature, comparing the real-time disassembly temperature with the second warning temperature and the third warning temperature to form a comparison result, and determining the fire level at the current moment according to the comparison result and the fire change rate, and performing fire warning based on the fire level; wherein, the second warning temperature is greater than the first warning temperature and less than or equal to the third warning temperature.

[0063] Further, in the embodiment of the present invention, when the real-time disassembly temperature is greater than the first warning temperature, comparing the real-time disassembly temperature with the second warning temperature and the third warning temperature to form a comparison result, and determining the fire level at the current moment according to the comparison result and the fire change rate, and performing fire warning based on the fire level specifically includes: When the real-time disassembly temperature is greater than the first warning temperature, comparing the real-time disassembly temperature with the second warning temperature and the third warning temperature; When the real-time disassembly temperature is greater than the first warning temperature and less than or equal to the second warning temperature, determining the fire level at the current moment according to the fire change rate, and performing fire warning based on the fire level; When the real-time disassembly temperature is greater than the second warning temperature and less than or equal to the third warning temperature, detect the disassembly area of the power battery, determine the fire level at the current moment according to the fire change rate and the disassembly area, and conduct a fire warning based on the fire level; When the real-time disassembly temperature is greater than the third warning temperature, determine the fire level at the current moment according to the fire change rate, and conduct a fire warning based on the fire level.

[0064] Further, in the embodiment of the present invention, when the real-time disassembly temperature is greater than the first warning temperature and less than or equal to the second warning temperature, determine the fire level at the current moment according to the fire change rate, and conduct a fire warning based on the fire level, specifically: When the real-time disassembly temperature is greater than the first warning temperature and less than or equal to the second warning temperature, compare the fire change rate with a preset change rate warning value; When the fire change rate is less than or equal to the change rate warning value, determine that the fire level at the current moment is the second level, and generate a attention prompt; When the fire change rate is greater than the change rate warning value, determine that the fire level at the current moment is the third level, and generate a warning prompt.

[0065] Further, in the embodiment of the present invention, when the real-time disassembly temperature is greater than the second warning temperature and less than or equal to the third warning temperature, detect the disassembly area of the power battery, determine the fire level at the current moment according to the fire change rate and the disassembly area, and conduct a fire warning based on the fire level, specifically: When the real-time disassembly temperature is greater than the second warning temperature and less than or equal to the third warning temperature, detect the disassembly area of the power battery; When the disassembly area is in a preset warning area, determine that the fire level at the current moment is the second level, and generate a attention prompt; When the disassembly area is not in a preset warning area, determine the fire level at the current moment according to the fire change rate, and conduct a fire warning based on the fire level.

[0066] Further, in the embodiment of the present invention, when the disassembly area is not in a preset warning area, determine the fire level at the current moment according to the fire change rate, and conduct a fire warning based on the fire level, specifically: When the disassembly area is not in a preset warning area, compare the fire change rate with a preset change rate warning value; When the fire change rate is less than or equal to the change rate warning value, determine that the fire level at the current moment is the third level, and generate a warning prompt; When the fire situation change rate is greater than the change rate warning value, determine that the fire situation level at the current moment is the fourth level, and generate a danger prompt.

[0067] Further, in the embodiment of the present invention, when the real-time disassembly temperature is greater than the third warning temperature, determine the fire situation level at the current moment according to the fire situation change rate, and perform fire situation warning based on the fire situation level, specifically: When the real-time disassembly temperature is greater than the third warning temperature, compare the fire situation change rate with a preset change rate warning value; When the fire situation change rate is less than or equal to the change rate warning value, determine that the fire situation level at the current moment is the fifth level, and generate a very dangerous prompt; When the fire situation change rate is greater than the change rate warning value, determine that the fire situation level at the current moment is the sixth level, and generate an ignition prompt.

[0068] Further, in the embodiment of the present invention, the fire situation warning device for power battery disassembly further includes: a pre-disassembly detection module; The pre-disassembly detection module is used to detect the open-circuit state voltage change of the power battery within a preset detection time before disassembling the power battery, form voltage detection data; analyze the remaining power and safety degree of the power battery based on the voltage detection data; judge whether the power battery can be safely disassembled according to the remaining power and the safety degree; if it is judged that the power battery can be safely disassembled, then disassemble the power battery.

[0069] In summary, the embodiment of the present invention provides a fire situation warning device for power battery disassembly. Based on the organic combination of modules, during the disassembly process of the power battery, the disassembly video and the real-time disassembly temperature are recorded in real time; the current image frame corresponding to the current moment and several previous image frames before the current moment are obtained from the disassembly video; based on the current image frame and several previous image frames, calculate the fire situation change rate at the current moment; determine the fire situation level at the current moment based on the real-time disassembly temperature and the fire situation change rate, and perform fire situation warning based on the fire situation level. The present invention uses real-time data as the basis for fire situation warning, can effectively improve the timeliness of fire situation warning, thereby improving the safety of the power battery during the disassembly process; combines multiple data for fire situation assessment, can improve the accuracy of fire situation warning; by setting the fire situation level and performing corresponding fire situation warning based on the fire situation level, can improve the comprehensiveness of fire situation warning.

[0070] The specific embodiments described above further elaborate on the object, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only for the specific embodiments of the present invention and is not intended to limit the protection scope of the present invention. In particular, for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for warning of fire in the disassembly of a power battery, characterized in that, Including: During the disassembly process of the power battery, the disassembly video and the real-time disassembly temperature are recorded in real time; In the disassembly video, the current image frame corresponding to the current moment and several previous image frames before the current moment are obtained; Based on the current image frame and several previous image frames, the fire change rate at the current moment is calculated; Based on the real-time disassembly temperature and the fire change rate, the fire level at the current moment is determined, and a fire warning is given based on the fire level.

2. The method for warning of fire in power battery disassembly according to claim 1, wherein The calculating the fire change rate at the current moment based on the current image frame and several previous image frames is specifically as follows: The fire areas of the current image frame and several previous image frames are calculated respectively to form fire data; Curve fitting is performed based on the fire data to form a fire trend curve; The current curvature at the current moment is obtained on the fire trend curve; The current curvature is determined as the fire change rate at the current moment.

3. The method for warning of fire in the disassembly of a power battery according to claim 1, wherein The determining the fire level at the current moment based on the real-time disassembly temperature and the fire change rate, and giving a fire warning based on the fire level is specifically as follows: When the real-time disassembly temperature is less than or equal to the first warning temperature, the fire level is determined to be the first level, and a safety prompt is generated; When the real-time disassembly temperature is greater than the first warning temperature, the real-time disassembly temperature is compared with the second warning temperature and the third warning temperature to form a comparison result, and the fire level at the current moment is determined according to the comparison result and the fire change rate, and a fire warning is given based on the fire level; wherein, the second warning temperature is greater than the first warning temperature and less than or equal to the third warning temperature.

4. The method for warning of fire in the disassembly of power batteries according to claim 3, characterized in that, The when the real-time disassembly temperature is greater than the first warning temperature, the real-time disassembly temperature is compared with the second warning temperature and the third warning temperature to form a comparison result, and the fire level at the current moment is determined according to the comparison result and the fire change rate, and a fire warning is given based on the fire level is specifically as follows: When the real-time disassembly temperature is greater than the first warning temperature, the real-time disassembly temperature is compared with the second warning temperature and the third warning temperature; When the real-time disassembly temperature is greater than the first warning temperature and less than or equal to the second warning temperature, the fire level at the current moment is determined according to the fire change rate, and a fire warning is given based on the fire level; When the real-time disassembly temperature is greater than the second warning temperature and less than or equal to the third warning temperature, the disassembly area of the power battery is detected, and the fire level at the current moment is determined according to the fire change rate and the disassembly area, and a fire warning is given based on the fire level; When the real-time disassembly temperature is greater than the third warning temperature, the fire level at the current moment is determined according to the fire change rate, and a fire warning is given based on the fire level.

5. The method for warning of fire in the disassembly of power batteries according to claim 4, wherein, The when the real-time disassembly temperature is greater than the first warning temperature and less than or equal to the second warning temperature, the fire level at the current moment is determined according to the fire change rate, and a fire warning is given based on the fire level is specifically as follows: When the real-time disassembly temperature is greater than the first warning temperature and less than or equal to the second warning temperature, compare the fire situation change rate with a preset change rate warning value; When the fire situation change rate is less than or equal to the change rate warning value, determine that the fire situation level at the current moment is the second level, and generate a attention prompt; When the fire situation change rate is greater than the change rate warning value, determine that the fire situation level at the current moment is the third level, and generate a warning prompt.

6. The method for warning of fire in the disassembly of a power battery according to claim 4, wherein, When the real-time disassembly temperature is greater than the second warning temperature and less than or equal to the third warning temperature, detect the disassembly area of the power battery, and determine the fire situation level at the current moment according to the fire situation change rate and the disassembly area, and conduct a fire situation warning based on the fire situation level. Specifically: When the real-time disassembly temperature is greater than the second warning temperature and less than or equal to the third warning temperature, detect the disassembly area of the power battery; When the disassembly area is in a preset warning area, determine that the fire situation level at the current moment is the second level, and generate a attention prompt; When the disassembly area is not in the preset warning area, determine the fire situation level at the current moment according to the fire situation change rate, and conduct a fire situation warning based on the fire situation level.

7. The method for warning of fire in the disassembly of a power battery according to claim 6, wherein, When the disassembly area is not in the preset warning area, determine the fire situation level at the current moment according to the fire situation change rate, and conduct a fire situation warning based on the fire situation level. Specifically: When the disassembly area is not in the preset warning area, compare the fire situation change rate with a preset change rate warning value; When the fire situation change rate is less than or equal to the change rate warning value, determine that the fire situation level at the current moment is the third level, and generate a warning prompt; When the fire situation change rate is greater than the change rate warning value, determine that the fire situation level at the current moment is the fourth level, and generate a danger prompt.

8. The method for warning of fire in the disassembly of a power battery according to claim 4, characterized in that, When the real-time disassembly temperature is greater than the third warning temperature, determine the fire situation level at the current moment according to the fire situation change rate, and conduct a fire situation warning based on the fire situation level. Specifically: When the real-time disassembly temperature is greater than the third warning temperature, compare the fire situation change rate with a preset change rate warning value; When the fire situation change rate is less than or equal to the change rate warning value, determine that the fire situation level at the current moment is the fifth level, and generate a very dangerous prompt; When the fire situation change rate is greater than the change rate warning value, determine that the fire situation level at the current moment is the sixth level, and generate an ignition prompt.

9. The method for warning of fire in the disassembly of a power battery according to claim 1, characterized in that, It further includes: Before disassembling the power battery, detect the change of the open-circuit state voltage of the power battery within a preset detection time to form voltage detection data; Analyze the remaining power and safety degree of the power battery based on the voltage detection data; Judge whether the power battery can be safely disassembled according to the remaining power and the safety degree; If it is judged that the power battery can be safely disassembled, disassemble the power battery.

10. A fire warning device for power battery disassembly, characterized in that It includes: A real-time monitoring module, an image acquisition module, a fire situation data acquisition module, and a fire situation warning module; The real-time monitoring module is used to record the disassembly video and the real-time disassembly temperature in real time during the disassembly process of the power battery; The image acquisition module is used to acquire the current image frame corresponding to the current moment and several previous image frames before the current moment in the disassembly video; The fire situation data acquisition module is used to calculate the fire situation change rate at the current moment based on the current image frame and several of the previous image frames; The fire situation early warning module is used to determine the fire situation level at the current moment based on the real-time disassembly temperature and the fire situation change rate, and conduct fire situation early warning based on the fire situation level.

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