Vehicle battery abnormity processing method and device, storage medium and vehicle

Abstract

The invention belongs to the technical field of new energy automobile batteries, and provides a vehicle battery abnormity processing method and device, a storage medium and a vehicle, and the method comprises the steps: if a current battery is in a to-be-alarmed state, determining that a current condition accords with a preset alarm condition of vehicle battery thermal runaway alarm through a vehicle battery abnormity determination strategy, if so, cutting off the current battery high voltage and generating thermal runaway alarm information. Through the processing method, the current battery high voltage is cut off and the thermal runaway alarm information is generated only on the premise that the current condition meets the preset alarm condition of the vehicle battery thermal runaway alarm; therefore, the accuracy of vehicle battery abnormity alarm is greatly improved, the thermal runaway alarm information can be quickly, timely and automatically generated, and the safety of vehicle driving is greatly improved.

Description

Technical Field

[0001] The present application belongs to the technical field of new energy vehicle batteries, and in particular, relates to a method, device, storage medium and vehicle for handling vehicle battery abnormalities. Background Art

[0002] With the improvement of battery cell safety technology, the strengthening of battery pack safety protection design, and the popularization of matching battery pack liquid cooling system, the phenomenon of thermal runaway and large-scale spread of battery cells is decreasing. At present, tests have shown that a certain brand of LFP (Lithium Iron Phosphate) square shell battery cells only open the battery cell explosion-proof valve to spray a small amount of accumulated heat and electrolyte and other substances after an internal short circuit. If the monitoring sensor can detect it at an early stage and cut off the battery high voltage in time and open the liquid cooling circulation system for heat dissipation, it can effectively prevent the thermal runaway of the battery cell from further spreading out of control and avoid danger to vehicles and even people.

[0003] Since only a small amount of material is ejected from the valve when the battery cell loses control, the physical and chemical properties (smoke, pressure, etc.) in the battery pack will change very little. Currently, monitoring sensors (such as smoke sensors and pressure sensors) adjust the sensitivity of the sensors to wake up the BMS (Battery Management System) and report abnormalities when they can sense very small changes. However, this high sensitivity can lead to false alarms, which can easily cause false alarm problems.

[0004] In order to solve the above-mentioned false alarm problem, the prior art generally uses the following two methods to deal with it.

[0005] The first is to monitor the abnormal condition of the vehicle battery through sensor equipment; if the sensor equipment monitors the abnormal condition of the vehicle battery, an alarm is processed. This method is due to the variety of battery cells, including square shells, cylinders, blades, etc., and different sizes; in addition, there are few preliminary tests on thermal runaway of newly developed battery cells, battery packs, and even complete vehicles. Due to the lack of a large amount of effective test data to configure the alarm strategy used for vehicle battery abnormal alarm, if the alarm threshold is configured too high based on the alarm strategy, it is easy to cause false alarms; if the alarm threshold is configured too low based on the preset alarm strategy, some situations that should be alarmed will be screened out.

[0006] The second method is to periodically monitor the abnormal condition of the vehicle battery through the AFE; if the vehicle battery is abnormally monitored by the AFE, an alarm is issued. Since this method requires real-time monitoring, it will have the problem of excessive power consumption.

[0007] Currently, the thermal runaway strategy mainly relies on the monitoring sensors inside the battery pack to wake up the BMS. The BMS determines whether to send an alarm signal by comprehensively judging the parameter thresholds such as voltage and temperature. Now, with the upgrade of cell technology, the safety protection of cells has been getting better and better. After a single series of cells goes out of control, only the valve opens and the out-of-control does not spread, resulting in no obvious change in the cell voltage. Especially for multiple parallel-connected cells, when a certain series of cells goes out of control, it does not spread, and this voltage change is even less obvious. In addition, the non-spread of cells leads to an insignificant change in the temperature collected by the temperature sensor far from the triggered cell. In this way, even after the highly sensitive monitoring sensor wakes up the BMS, it is difficult to comprehensively judge whether the battery pack has experienced thermal runaway. On the contrary, if the parameter thresholds such as voltage and temperature are lowered to facilitate triggering a thermal runaway alarm through small changes, this is extremely likely to cause false alarms of thermal runaway, and even cut off the high voltage during driving, ultimately greatly increasing the danger of users when using the vehicle and making it impossible to drive safely.

[0008] Based on the existing problems of missed alarms and false alarms mentioned above, how to improve the accuracy of vehicle battery abnormal alarms is a technical problem to be solved. Summary of the Invention

[0009] Based on this, it is necessary to provide a method, device, storage medium, and electronic device for handling vehicle battery abnormalities in view of the defect of low accuracy of vehicle battery abnormal alarms existing in the prior art.

[0010] In a first aspect, an embodiment of the present invention provides a method for handling vehicle battery abnormalities, the method including:

[0011] Obtain current battery data related to the target vehicle battery condition monitored by in-vehicle sensor devices; and obtain a fault identification condition, where the fault identification condition is used to determine whether the current battery has been identified as a faulty battery based on the current battery data;

[0012] If the current battery data is within the fault value range defined by the fault identification condition, then identify the current battery as a faulty battery and determine that the current battery is in a state to be alarmed;

[0013] If the current battery is in the state to be alarmed and it is determined through the vehicle battery abnormality determination strategy that the current condition meets the preset alarm condition for vehicle battery thermal runaway alarm, then cut off the high voltage of the current battery and generate a thermal runaway alarm message.

[0014] Optionally, the first trigger condition corresponding to the fault identification condition includes:

[0015] If the in-vehicle sensor device is a pressure sensor and the air pressure rise rate within a preset determination duration is greater than a first preset value, then identify the current battery as a faulty battery and generate a corresponding fault flag; or,

[0016] If the vehicle-mounted sensor device is a pressure sensor, and the difference between the current pressure value at the current moment and the previous pressure value within a preset interval duration is greater than a second preset value, then mark the current battery as a faulty battery and generate a corresponding fault flag bit; or,

[0017] If the vehicle-mounted sensor device is a smoke sensor, and the PWM duty cycle corresponding to a preset concentration is greater than or equal to a third preset value, then mark the current battery as a faulty battery and generate a corresponding fault flag bit.

[0018] Optionally, the second trigger condition corresponding to the preset alarm condition includes any one of the following combinations:

[0019] The minimum cell voltage is less than or equal to a fourth preset value within a preset duration, and the highest temperature is greater than or equal to a fifth preset value within the preset duration; or,

[0020] The minimum cell voltage is less than or equal to a fourth preset value within a preset duration, and the temperature rise rate is greater than or equal to a sixth preset value within the preset duration; or,

[0021] The current pressure condition meets the preset pressure condition, and the minimum cell voltage is less than or equal to a fourth preset value within a preset duration; or,

[0022] The current pressure condition meets the preset pressure condition, and the highest temperature is greater than or equal to a fifth preset value within a preset duration; or,

[0023] The current pressure condition meets the preset pressure condition, and the temperature rise rate is greater than or equal to a sixth preset value within a preset duration; or,

[0024] The current pressure condition meets the preset pressure condition, and there is an insulation fault under the current condition.

[0025] Optionally, the method further includes:

[0026] Configure the preset pressure condition to include: the air pressure rise rate within a preset determination duration is greater than a first preset value, or the difference between the current pressure value at the current moment and the previous pressure value within a preset interval duration is greater than a second preset value.

[0027] Optionally, after obtaining the current battery data monitored by the vehicle-mounted sensor device related to the battery condition of the target vehicle, the method further includes:

[0028] If the current battery data shows that multiple parameters of multiple signals in the battery pack change and the current condition has reached multiple preset thermal runaway thresholds, wake up the target vehicle in the sleep state, where the multiple preset thermal runaway thresholds are the thresholds used to trigger an alarm.

[0029] Optionally, after generating the thermal runaway alarm information, the method further includes:

[0030] Controlling the target vehicle in motion to stop at a randomly generated position to be stopped.

[0031] Optionally, the method further includes:

[0032] If the current battery is in the to-be-alarmed state and it is determined through the vehicle battery anomaly determination strategy that the current conditions do not meet the preset alarm conditions, then maintain the current state of the target vehicle unchanged and ignore the current battery that has been identified as a faulty battery.

[0033] In a second aspect, an embodiment of the present invention provides a device for handling vehicle battery anomalies, the device including:

[0034] An acquisition module, configured to acquire current battery data related to the battery status of the target vehicle monitored by an in-vehicle sensor device; and acquire a fault identification condition, where the fault identification condition is used to determine whether the current battery has been identified as a faulty battery based on the current battery data;

[0035] A determination module, configured to determine that the current battery has been identified as a faulty battery and determine that the current battery is in a to-be-alarmed state if the current battery data is within the fault value range defined by the fault identification condition;

[0036] A cut-off module, configured to cut off the high voltage of the current battery if the current battery is in the to-be-alarmed state and it is determined through the vehicle battery anomaly determination strategy that the current conditions have met the preset alarm conditions for vehicle battery thermal runaway alarm;

[0037] A generation module, configured to generate a thermal runaway alarm information.

[0038] In a third aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed in a computer, the computer is made to execute the method of the first aspect.

[0039] In a fourth aspect, a vehicle is provided, including a memory and a processor. An executable code is stored in the memory. When the processor executes the executable code, the method of the first aspect is implemented.

[0040] In an embodiment of the present invention, current battery data related to the battery condition of a target vehicle monitored by an in-vehicle sensor device is acquired; and a fault identification condition is acquired, where the fault identification condition is used to determine whether the current battery has been identified as a faulty battery based on the current battery data; if the current battery data is within the fault value range defined by the fault identification condition, the current battery is identified as a faulty battery, and it is determined that the current battery is in a state of waiting for an alarm; and if the current battery is in a state of waiting for an alarm and it is determined through a vehicle battery anomaly determination strategy that the current condition has met the preset alarm condition for vehicle battery thermal runaway alarm, the high voltage of the current battery is cut off, and a thermal runaway alarm message is generated. The processing method provided by the embodiment of the present invention only cuts off the high voltage of the current battery, generates a thermal runaway alarm message, and performs reporting processing on the thermal runaway alarm message on the premise that the current condition meets the preset alarm condition for vehicle battery thermal runaway alarm; in this way, not only is the accuracy of vehicle battery anomaly alarm greatly improved, but also the thermal runaway alarm message can be automatically generated quickly and in a timely manner, greatly improving the safety of vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] By referring to the following drawings, the exemplary embodiments of the present invention can be more completely understood. The drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings, the same reference numerals generally represent the same components or steps.

[0042] Figure 1 It is a flowchart of a method for processing vehicle battery anomalies provided according to an exemplary embodiment of the present invention;

[0043] Figure 2 It is a flowchart of a method for processing vehicle battery anomalies in a specific application scenario;

[0044] Figure 3 It is a flowchart of a method for processing vehicle battery anomalies in another specific application scenario;

[0045] Figure 4 It is a schematic structural diagram of a vehicle battery anomaly processing device 200 provided according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The exemplary embodiments of the present application will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be completely conveyed to those skilled in the art.

[0047] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those skilled in the art to which the present invention pertains.

[0048] In addition, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product, or equipment that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products, or equipment.

[0049] Embodiments of the present invention provide a method and device for handling abnormal vehicle batteries, a computer-readable medium, and a vehicle, which will be described below with reference to the accompanying drawings.

[0050] Please refer to Figure 1 , which shows a flowchart of the method for handling abnormal vehicle batteries provided by some embodiments of the present invention. As Figure 1 shown, the method for handling abnormal vehicle batteries may include the following steps:

[0051] Step S101: Obtain the current battery data related to the target vehicle battery monitored by in-vehicle sensor devices; and obtain a fault identification condition, which is used to determine whether the current battery has been identified as a faulty battery based on the current battery data;

[0052] In one example, the first trigger condition corresponding to the fault identification condition includes:

[0053] If the in-vehicle sensor device is a pressure sensor and the air pressure rise rate within a preset determination duration is greater than a first preset value, then identify the current battery as a faulty battery and generate a corresponding fault flag bit.

[0054] In another example, the first trigger condition corresponding to the fault identification condition includes:

[0055] If the in-vehicle sensor device is a pressure sensor and the difference between the current pressure value at the current moment and the previous pressure value at a preset interval duration is greater than a second preset value, then identify the current battery as a faulty battery and generate a corresponding fault flag bit.

[0056] In yet another example, the first trigger condition corresponding to the fault identification condition includes:

[0057] If the in-vehicle sensor device is a smoke sensor and the PWM duty cycle corresponding to a preset concentration is greater than or equal to a third preset value, then identify the current battery as a faulty battery and generate a corresponding fault flag bit.

[0058] In a specific application scenario, the preset determination duration can be set to 1 s; the air pressure rise rate corresponding to the first preset value is: 0.25 Kpa / 0.5 s; the pressure value difference corresponding to the second preset value is 2 Kpa; the preset concentration is: 4000 μg / m3; the PWM duty cycle corresponding to the third preset value is 40%. The above are only examples. It should be noted that the above preset determination duration, preset interval duration, first preset value, second preset value, and third preset value can all be configured according to different application scenarios and are not specifically limited here.

[0059] In an actual application scenario, the above vehicle-mounted sensors are used to monitor the status inside the vehicle battery pack in real time, and at the same time, the sensitivity of the vehicle-mounted sensors is set to the highest value required by the battery pack to ensure that the corresponding physical and chemical changes, such as smoke and pressure, can be detected immediately after the battery cell valve opens. The high sensitivity of the vehicle-mounted sensors can sense the weak changes inside the battery pack in real time. By reaching the set alarm threshold, the BMS battery management system can be normally awakened. At this time, without considering the risk of false awakening of the vehicle-mounted sensors, in this way, the small abnormal changes inside the battery pack can be immediately converted into BMS wake-up signals.

[0060] The setting result of setting the sensitivity of the vehicle-mounted sensor to the highest value required by the battery pack can be specifically described as follows:

[0061] In an example, if the vehicle-mounted sensor is a pressure sensor, the following configuration is performed:

[0062] Air pressure rise rate > 0.25 Kpa / 0.5 s (determination time 1 s) or current moment pressure value > pressure value Ts ago + 2 Kpa, each cycle is 0.1 s, Ts = 60 s.

[0063] In another example, if the vehicle-mounted sensor is a smoke sensor, the following configuration is performed:

[0064] The PWM duty cycle corresponding to a concentration of 4000 μg / m3 is 40%.

[0065] It should be noted that the PWM duty cycle is the proportion of the high level in the entire cycle within a pulse cycle.

[0066] Step S102: If the current battery data is within the fault value range defined by the fault identification condition, then mark the current battery as a faulty battery and determine that the current battery is in a state of waiting for an alarm.

[0067] Step S103: If the current battery is in a state of waiting for an alarm and it is determined through the vehicle battery anomaly determination strategy that the current condition already meets the preset alarm condition for vehicle battery thermal runaway alarm, then cut off the high voltage of the current battery and generate a thermal runaway alarm message.

[0068] In a specific application scenario, the vehicle battery abnormality determination strategy specifically includes:

[0069] 1) The minimum single - cell voltage Vmin ≤ 1.5V (lasting for 3s) & the maximum temperature Tmax ≥ 68℃ (lasting for 3s);

[0070] 2) The minimum single - cell voltage Vmin ≤ 1.5V (lasting for 3s) & the temperature rise rate dT / dt ≥ 1℃ / s (lasting for 3s);

[0071] 3) Pressure condition A & the minimum single - cell voltage Vmin ≤ 1.5V (lasting for 3s);

[0072] 4) Pressure condition A & the maximum temperature Tmax ≥ 68℃ (lasting for 3s);

[0073] 5) Pressure condition A & the temperature rise rate dT / dt ≥ 1℃ / s (lasting for 3s);

[0074] 6) Pressure condition A & insulation failure;

[0075] The above combined conditions are in an OR relationship with each other. When one set of conditions occurs, it is determined as thermal runaway, and the BMS immediately issues an alarm.

[0076] Among them, the pressure condition A is defined as:

[0077] The air pressure rise rate > 0.25Kpa / 0.5s (judgment time 1s) or the current pressure value > the pressure value before Ts + 2Kpa, each cycle is 0.1s, and Ts = 60s.

[0078] In an example, the second trigger conditions corresponding to the preset alarm conditions include any one of the following combinations:

[0079] The minimum single - cell voltage is less than or equal to the fourth preset value within the preset duration, and the maximum temperature is greater than or equal to the fifth preset value within the preset duration; or,

[0080] The minimum single - cell voltage is less than or equal to the fourth preset value within the preset duration, and the temperature rise rate is greater than or equal to the sixth preset value within the preset duration; or,

[0081] The current pressure condition meets the preset pressure condition, and the minimum single - cell voltage is less than or equal to the fourth preset value within the preset duration; or,

[0082] The current pressure condition meets the preset pressure condition, and the maximum temperature is greater than or equal to the fifth preset value within the preset duration; or,

[0083] The current pressure condition meets the preset pressure condition, and the temperature rise rate is greater than or equal to the sixth preset value within the preset duration; or,

[0084] The current pressure condition meets the preset pressure condition, and there is an insulation fault in the current condition.

[0085] In a specific application scenario, the minimum single-cell voltage corresponding to the fourth preset value is set to: 1.5V; the preset duration is set to 3s; the highest temperature corresponding to the fifth preset value is: 68°C; the temperature rise rate corresponding to the sixth preset value is 1°C / s; the preset pressure condition can be configured as: the air pressure rise rate > 0.25 Kpa / 0.5s (judgment time 1s) or the current pressure value at the current moment > the pressure value before Ts + 2 Kpa, 0.1s for each cycle, Ts = 60s.

[0086] It should be noted that the above are merely examples, and the preset duration, the fourth preset value, the fifth preset value, and the sixth preset value can all be configured according to different application scenarios, and no specific limitations are made here.

[0087] In an actual application scenario, since the vehicle battery abnormality determination strategy adopts the multiple thresholds corresponding to the above second trigger condition. When the above second trigger condition is satisfied, that is, the preset alarm condition is satisfied, it is determined that the vehicle battery is in an abnormal state, and alarm processing is performed on this abnormal state.

[0088] In one example, the method for handling vehicle battery abnormalities provided by the embodiments of the present invention may further include the following steps:

[0089] The preset pressure condition is configured to include: the air pressure rise rate within the preset determination duration is greater than the first preset value.

[0090] It should be noted that the above fourth preset value, preset duration, fifth preset value, and sixth preset value can all be configured according to different application scenarios, and no specific limitations are made here.

[0091] In another example, the method for handling vehicle battery abnormalities provided by the embodiments of the present invention may further include the following steps:

[0092] The preset pressure condition is configured to include: the difference between the current pressure value at the current moment and the pressure value before the preset interval duration is greater than the second preset value.

[0093] It should be noted that the above preset determination duration, preset interval duration, first preset value, and second preset value can all be configured according to different application scenarios, and no specific limitations are made here.

[0094] In one example, after obtaining the current battery data related to the target vehicle battery condition monitored by the in-vehicle sensor device, the method for handling vehicle battery abnormalities provided by the embodiments of the present invention may further include the following steps:

[0095] If the current battery data shows that multiple parameters of multiple signals in the battery pack have changed and the current conditions have reached multiple preset thermal runaway thresholds, the target vehicle in the sleep state is woken up, and the multiple preset thermal runaway thresholds are the thresholds used to trigger an alarm.

[0096] It should be noted that the multiple preset thermal runaway thresholds in this step refer to the respective thresholds included in the aforementioned second alarm trigger condition, which will not be elaborated here.

[0097] In one example, after generating the thermal runaway alarm information, the method for handling vehicle battery anomalies provided by the embodiments of the present invention may further include the following steps:

[0098] Control the target vehicle in motion to dock at a randomly generated position to be docked; in this way, safe driving can be achieved, and the safety of the user driving the target vehicle can be guaranteed.

[0099] In one example, the method for handling vehicle battery anomalies provided by the embodiments of the present invention may further include the following steps:

[0100] If the current battery is in a state of waiting for an alarm and it is determined through the vehicle battery anomaly determination strategy that the current conditions do not meet the preset alarm conditions for vehicle battery thermal runaway alarm, the current state of the target vehicle remains unchanged, and the battery that has been identified as a faulty battery is ignored; in this way, on the basis of ensuring the accuracy of vehicle battery anomaly alarms, the memory overhead can be greatly saved.

[0101] In one example, after generating the thermal runaway alarm information, the method for handling vehicle battery anomalies provided by the embodiments of the present invention may further include the following steps:

[0102] Perform a reporting process on the thermal runaway alarm information; in this way, the safety of vehicle driving can be greatly improved.

[0103] The method for handling vehicle battery anomalies provided by the embodiments of the present invention can solve the problems of false alarms and non - reporting after the sensor wakes up the BMS when the vehicle is in the sleep state. Specifically as follows:

[0104] 1) No false alarms.

[0105] When the vehicle is in the sleep state, after the BMS is woken up by the sensor, the abnormal signals uploaded by the sensor are locked and stored in the register as the standby reference signals for thermal runaway alarm, without waking up the whole vehicle and without reporting the abnormal conditions of the vehicle battery detected by the in - vehicle sensors. At the same time, parameters such as the voltage, temperature threshold, change amount threshold, and insulation fault signal in the battery pack are detected.

[0106] Through the above - mentioned processing process, the problem of false alarms existing in the prior art can be effectively solved.

[0107] 2) No false negatives. If there are no changes in other signal parameters within the battery pack, continuously monitor the battery pack status for 5 minutes. If a threshold parameter is satisfied within 5 minutes, wake up the entire vehicle; if there is no change, automatically enter the sleep state. When the vehicle is powered on next time, switch the power-on mode alarm strategy. If there is no fault after 1 minute, clear the fault signals (fault signals corresponding to battery faults detected by on-vehicle sensors) in the buffer.

[0108] If any parameter of other signals within the battery pack changes, but does not reach the set thermal runaway threshold and there is no alarm for insulation faults, the BMS does not enter the sleep state. Continuously monitor the battery pack status for 1 hour. If there is a change within 1 hour, wake up the entire vehicle; if there is no change, automatically enter the sleep state. When the vehicle is powered on next time, switch the power-on mode alarm strategy. If there is no fault after 10 minutes, clear the fault flag bits (fault flag bits corresponding to battery faults detected by on-vehicle sensors) in the buffer.

[0109] If any parameter of other signals within the battery pack changes and reaches the set thermal runaway threshold, immediately wake up the entire vehicle, generate a thermal runaway alarm message, and report and process this thermal runaway alarm message for fast and timely alarm.

[0110] Through the above processing process, the problem of false negatives existing in the prior art can be effectively solved.

[0111] In a specific application scenario, for any signal, such as the single-cell voltage and temperature signals, the normal lithium iron phosphate battery cell has a voltage of 2.0 - 3.75V and the maximum cell temperature is 55°C. When the voltage drops or jumps to the minimum single-cell voltage Vmin ≤ 1.5V (lasting for 3s), or the temperature rises abnormally or jumps to the maximum temperature Tmax ≥ 68°C (lasting for 3s), it indicates that the battery parameter changes abnormally.

[0112] Multiple thermal runaway thresholds can be set as follows:

[0113] 1) Minimum single-cell voltage Vmin ≤ 1.5V (lasting for 3s) & maximum temperature Tmax ≥ 68°C (lasting for 3s);

[0114] 2) Minimum single-cell voltage Vmin ≤ 1.5V (lasting for 3s) & temperature rise rate dT / dt ≥ 1°C / s (lasting for 3s);

[0115] 3) Pressure condition A & minimum single-cell voltage Vmin ≤ 1.5V (lasting for 3s);

[0116] 4) Pressure condition A & maximum temperature Tmax ≥ 68°C (lasting for 3s);

[0117] 5) Pressure condition A & temperature rise rate dT / dt ≥ 1°C / s (lasting for 3s);

[0118] 6) Pressure condition A & insulation fault;

[0119] Among them, pressure condition A is defined as: the air pressure rising rate > 0.25 Kpa / 0.5 s (judgment time 1 s) or the current pressure value > the pressure value before Ts + 2 Kpa, 0.1 s for each cycle, and Ts = 60 s.

[0120] It should be noted that the above multiple thermal runaway thresholds are only examples, and the above multiple thermal runaway thresholds can all be configured according to different application scenarios, and no specific limitations are made here.

[0121] As Figure 2 shown, it is a flowchart of the method for handling vehicle battery anomalies in a specific application scenario.

[0122] As Figure 2 shown, the specific implementation process of the method for handling vehicle battery anomalies in a specific application scenario is as follows:

[0123] Start; determine whether there is an abnormal fault in the current battery based on the current battery data monitored by the sensor (in-vehicle sensor device); if it is determined that there may be an abnormal fault in the current battery, further monitor through the battery management system to determine whether the current condition has reached the thermal runaway threshold for alarm processing based on the current battery data; if it is determined that the current condition has reached the thermal runaway threshold for alarm processing, perform the following operations: cut off the high voltage of the battery and report the thermal runaway alarm information of the battery; end; otherwise, if it is determined that the current condition has not reached the thermal runaway threshold for alarm processing, perform the following operations: keep the vehicle state unchanged; and after the next power-off and power-on, clear the fault flag in the buffer.

[0124] As Figure 3 shown, it is a flowchart of the method for handling vehicle battery anomalies in another specific application scenario.

[0125] As Figure 3 shown, the specific implementation process of the method for handling vehicle battery anomalies in a specific application scenario is as follows:

[0126] Start; Determine whether there is an abnormal fault in the current battery based on the current battery data monitored by the sensor (in-vehicle sensor device); If it is determined that there may be an abnormal fault in the current battery, further monitor through the BMS and determine whether the signal threshold has changed; If it is determined that the signal threshold has changed, further determine whether the current condition has reached the thermal runaway alarm threshold; If it is determined that the current condition has reached the thermal runaway alarm threshold, wake up the entire vehicle and report the thermal runaway alarm information for processing; Otherwise, if it is determined that the current condition has not reached the thermal runaway alarm threshold, continuously monitor for 1 hour and determine whether the threshold has changed during this period. If it has changed, wake up the entire vehicle and report the thermal runaway alarm information for processing; Otherwise, clear the fault (fault flag bit in the buffer) 10 minutes after the next power-on, and the target vehicle enters the sleep state, and finally ends the processing flow. During the above processing, if it is determined that there is no abnormal fault in the current battery, the target vehicle enters the sleep state, and finally ends the processing flow. During the above processing, if it is determined that the signal threshold has not changed, continuously monitor for 5 minutes and determine whether the threshold has changed during this process. If the threshold is monitored to have changed during this period, wake up the entire vehicle and report the thermal runaway alarm information for processing; Otherwise, if the threshold is not monitored to have changed during this period, perform the following operations: Clear the fault (fault flag bit in the buffer) 1 minute after the next power-on, and the target vehicle enters the sleep state, and finally ends the processing flow.

[0127] It should be noted that for the detailed description of the thermal runaway alarm threshold above, please refer to the description of the same or similar parts above, and it will not be repeated here.

[0128] During the above processing, when the vehicle is in the sleep state, after the BMS is woken up by the sensor, it locks the abnormal signal uploaded by the sensor and stores it in the register as a backup reference signal for thermal runaway alarm, without waking up the entire vehicle, without reporting the sensor abnormality, and at the same time detecting the voltage, temperature threshold, change amount threshold, and insulation fault signal in the battery pack.

[0129] If there is no change in other signal parameters in the battery pack (the minimum single-cell voltage Vmin ≤ 1.5V (lasting for 3s), the temperature rise rate dT / dt ≥ 1℃ / s (lasting for 3s), the highest temperature Tmax ≥ 68℃, and there is no insulation fault alarm. After combining them in pairs, continuously monitor the battery pack status for 5 minutes. If a threshold parameter meets the condition within 5 minutes, wake up the entire vehicle. If there is no change, automatically enter the sleep state. When the vehicle is powered on next time, switch the power-on mode alarm strategy. If there is no fault after 1 minute, clear the fault flag bit in the buffer.

[0130] If any parameter of other signals in the battery pack changes, but does not reach the set thermal runaway threshold (minimum cell voltage Vmin ≤ 1.5V (for 3s continuously), temperature rise rate dT / dt ≥ 1℃ / s (for 3s continuously), maximum temperature Tmax ≥ 68℃, insulation fault alarm. After pairwise combination, the BMS does not enter the sleep state and continuously monitors the status of the battery pack for 1 hour. If there is a change within 1 hour, the vehicle is woken up. If there is no change, it automatically enters the sleep state. When the vehicle is powered on next time, the power-on mode alarm strategy is switched. If there is no fault after 10 minutes, the fault flag bit in the buffer is cleared.

[0131] If any parameter of other signals in the battery pack changes and reaches the set thermal runaway threshold (minimum cell voltage Vmin ≤ 1.5V (for 3s continuously), temperature rise rate dT / dt ≥ 1℃ / s (for 3s continuously), maximum temperature Tmax ≥ 68℃, insulation fault alarm. After pairwise combination, the vehicle is immediately woken up and a thermal runaway alarm message is reported.

[0132] When the vehicle is powered on, the BMS continuously monitors the current battery data of the target vehicle. If an abnormal signal is detected, it is locked and stored in the register. At the same time, the voltage, temperature threshold, and change amount threshold in the battery pack, as well as the insulation fault signal, are monitored. During the above process, if a thermal runaway alarm message is received, the high-voltage of the battery is cut off according to the received fault level information; otherwise, the vehicle state remains unchanged, that is, no sensor fault is reported and no alarm signal is reported. After that, the target vehicle is continuously monitored until it is powered off. After power-off, the fault flag bit in the buffer is cleared when it is powered on next time.

[0133] It should be noted that for the judgment process of the change of other signal parameters in the battery pack, refer to the description of the same or similar parts above, and will not be repeated here.

[0134] The processing method provided by the embodiment of the present invention only cuts off the current battery high-voltage, generates a thermal runaway alarm message, and performs reporting processing on the thermal runaway alarm message when the current conditions meet the preset alarm conditions for vehicle battery thermal runaway alarm; in this way, not only greatly improves the accuracy of vehicle battery abnormal alarm, avoids unnecessary panic that may be caused to users, and improves the user experience of using the vehicle; but also can quickly and timely generate a thermal runaway alarm message automatically, greatly improving the safety of vehicle driving. In addition, the processing method provided by the embodiment of the present invention can alarm quickly and timely to remind the driving user of the target vehicle to escape from the vehicle in a dangerous state as soon as possible through alarm signals (such as alarm sounds, flashing alarm lights).

[0135] In the above embodiments, a method for handling abnormal vehicle batteries is provided. Correspondingly, the present invention also provides a device for handling abnormal vehicle batteries. The device for handling abnormal vehicle batteries provided by the embodiments of the present invention can implement the above method for handling abnormal vehicle batteries, and the device for handling abnormal vehicle batteries can be implemented in a software, hardware, or software-hardware combination manner. For example, the device for handling abnormal vehicle batteries can include integrated or separate functional modules or units to execute the corresponding steps in the above methods.

[0136] Please refer to Figure 4 , which shows a schematic diagram of a device for handling abnormal vehicle batteries provided by some embodiments of the present invention. Since the device embodiments are basically similar to the method embodiments, the description is relatively simple, and for the relevant parts, refer to the partial description of the method embodiments. The device embodiments described below are only illustrative.

[0137] As Figure 4 shown, the device 400 for handling abnormal vehicle batteries may include:

[0138] An acquisition module 401, configured to acquire current battery data related to the target vehicle battery status monitored by the vehicle-mounted sensor device; and acquire a fault identification condition, where the fault identification condition is used to determine whether the current battery has been identified as a faulty battery based on the current battery data;

[0139] An identification module 402, configured to, if the current battery data is within the fault value range defined by the fault identification condition, identify the current battery as a faulty battery;

[0140] A determination module 403, configured to determine that the current battery is in a state to be alarmed;

[0141] A cut-off module 404, configured to, if the current battery is in a state to be alarmed and it is determined through the vehicle battery abnormality determination strategy that the current condition has met the preset alarm condition for vehicle battery thermal runaway alarm, cut off the high voltage of the current battery;

[0142] A generation module 405, configured to generate a thermal runaway alarm message.

[0143] In some embodiments of the embodiments of the present invention, the first trigger condition corresponding to the fault identification condition includes:

[0144] If the vehicle-mounted sensor device is a pressure sensor and the air pressure rise rate within the preset determination duration is greater than the first preset value, then identify the current battery as a faulty battery and generate a corresponding fault flag; or,

[0145] If the in-vehicle sensor device is a pressure sensor and the difference between the current pressure value at the current moment and the previous pressure value within a preset interval duration is greater than a second preset value, then mark the current battery as a faulty battery and generate a corresponding fault flag; or,

[0146] If the in-vehicle sensor device is a smoke sensor and the PWM duty cycle corresponding to a preset concentration is greater than or equal to a third preset value, then mark the current battery as a faulty battery and generate a corresponding fault flag.

[0147] In some embodiments of the embodiments of the present invention, the second trigger condition corresponding to the preset alarm condition includes any one of the following combinations:

[0148] The minimum cell voltage is less than or equal to a fourth preset value within a preset duration and the highest temperature is greater than or equal to a fifth preset value within the preset duration; or,

[0149] The minimum cell voltage is less than or equal to a fourth preset value within a preset duration and the temperature rise rate is greater than or equal to a sixth preset value within the preset duration; or,

[0150] The current pressure condition meets the preset pressure condition and the minimum cell voltage is less than or equal to a fourth preset value within a preset duration; or,

[0151] The current pressure condition meets the preset pressure condition and the highest temperature is greater than or equal to a fifth preset value within a preset duration; or,

[0152] The current pressure condition meets the preset pressure condition and the temperature rise rate is greater than or equal to a sixth preset value within a preset duration; or,

[0153] The current pressure condition meets the preset pressure condition and there is an insulation fault in the current condition.

[0154] In some embodiments of the embodiments of the present invention, the processing device 400 for abnormal vehicle batteries may further include:

[0155] A configuration module (not shown in Figure 4 ), configured to configure the preset pressure condition to include: the air pressure rise rate within a preset determination duration is greater than a first preset value, or the difference between the current pressure value at the current moment and the previous pressure value within a preset interval duration is greater than a second preset value.

[0156] In some embodiments of the embodiments of the present invention, the processing device 400 for abnormal vehicle batteries may further include:

[0157] A wake-up module (in Figure 4(not shown) is used to wake up the target vehicle in a dormant state after obtaining the current battery data related to the battery status of the target vehicle monitored by the on-board sensor equipment, if the current battery data shows that multiple parameters of multiple signals in the battery pack have changed and the current conditions have reached multiple preset thermal runaway thresholds, and the multiple preset thermal runaway thresholds are the thresholds used to trigger the alarm.

[0158] In some implementations of the embodiments of the present invention, the vehicle battery abnormality processing device 400 may further include:

[0159] Control module (in Figure 4 ), which is used to control the moving target vehicle to stop at a randomly generated to-be-stopped position after generating the thermal runaway alarm information.

[0160] In some implementations of the embodiments of the present invention, the vehicle battery abnormality processing device 400 may further include:

[0161] Processing module (in Figure 4 (not shown) is used to maintain the current state of the target vehicle unchanged and ignore the battery that has been identified as a faulty battery if the current battery is in a pending alarm state and the vehicle battery abnormality determination strategy determines that the current condition does not meet the preset alarm condition for the vehicle battery thermal runaway alarm.

[0162] In some embodiments of the embodiments of the present invention, in some embodiments of the embodiments of the present invention, the vehicle battery abnormality processing device 400 provided in the embodiments of the present invention is based on the same inventive concept as the vehicle battery abnormality processing method provided in the aforementioned embodiments of the present invention and has the same beneficial effects.

[0163] According to another embodiment, there is also provided a computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to execute a combination of Figure 1 The method described.

[0164] According to another embodiment, a vehicle is provided, comprising a memory and a processor, wherein the memory stores an executable code, and when the processor executes the executable code, the vehicle is combined with Figure 1 The method described.

[0165] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the present invention can be implemented by hardware, software, firmware or any combination thereof. When implemented by software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium.

[0166] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solution of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for handling abnormal vehicle batteries, characterized in that, The method includes: Obtaining current battery data related to the battery condition of a target vehicle monitored by an in-vehicle sensor device; and obtaining a fault identification condition for determining whether the current battery has been identified as a faulty battery based on the current battery data; If the current battery data is within the fault value range defined by the fault identification condition, then identify the current battery as a faulty battery and determine that the current battery is in a state to be alarmed; If the current battery is in the state to be alarmed and it is determined through a vehicle battery anomaly determination strategy that the current condition has met the preset alarm condition for vehicle battery thermal runaway alarm, then cut off the high voltage of the current battery and generate a thermal runaway alarm message.

2. The processing method according to claim 1, wherein The first trigger condition corresponding to the fault identification condition includes: If the in-vehicle sensor device is a pressure sensor and the air pressure rising rate within a preset determination duration is greater than a first preset value, then identify the current battery as a faulty battery and generate a corresponding fault flag; or, If the in-vehicle sensor device is a pressure sensor and the difference between the current pressure value at the current moment and the previous pressure value at a preset interval duration is greater than a second preset value, then identify the current battery as a faulty battery and generate a corresponding fault flag; or, If the in-vehicle sensor device is a smoke sensor and the PWM duty cycle corresponding to a preset concentration is greater than or equal to a third preset value, then identify the current battery as a faulty battery and generate a corresponding fault flag.

3. The processing method according to claim 1, wherein The second trigger condition corresponding to the preset alarm condition includes any one of the following combinations: The minimum cell voltage is less than or equal to a fourth preset value within a preset duration and the highest temperature is greater than or equal to a fifth preset value within the preset duration; Or, The minimum cell voltage is less than or equal to a fourth preset value within a preset duration and the temperature rise rate is greater than or equal to a sixth preset value within the preset duration; Or, The current pressure condition meets the preset pressure condition and the minimum cell voltage is less than or equal to a fourth preset value within a preset duration; Or, The current pressure condition meets the preset pressure condition and the highest temperature is greater than or equal to a fifth preset value within a preset duration; Or, The current pressure condition meets the preset pressure condition and the temperature rise rate is greater than or equal to a sixth preset value within a preset duration; Or, The current pressure condition meets the preset pressure condition and there is an insulation fault in the current condition.

4. The processing method according to claim 3, characterized in that, The method further includes: Configuring the preset pressure condition to include: the air pressure rising rate within a preset determination duration is greater than a first preset value, or the difference between the current pressure value at the current moment and the previous pressure value at a preset interval duration is greater than a second preset value.

5. The processing method according to claim 1, characterized in that After obtaining the current battery data related to the battery condition of the target vehicle monitored by the in-vehicle sensor device, the method further includes: If multiple parameters of multiple signals in the battery pack change as shown in the current battery data and the current conditions have reached multiple preset thermal runaway thresholds, the target vehicle in the dormant state is woken up, and the multiple preset thermal runaway thresholds are the thresholds used to trigger an alarm.

6. The processing method according to claim 1, characterized in that, After generating the thermal runaway alarm information, the method further includes: Controlling the target vehicle in motion to stop at a randomly generated position to be stopped.

7. The processing method according to claim 1, wherein The method further includes: If the current battery is in the to-be-alarmed state and it is determined through the vehicle battery anomaly determination strategy that the current conditions do not meet the preset alarm conditions, the current state of the target vehicle remains unchanged, and the current battery that has been identified as a faulty battery is ignored.

8. A processing device for vehicle battery anomalies, characterized in that, The device includes: An acquisition module, configured to acquire current battery data related to the battery condition of the target vehicle monitored by an in-vehicle sensor device; and acquire a fault identification condition, where the fault identification condition is used to determine whether the current battery has been identified as a faulty battery based on the current battery data; An identification module, configured to identify the current battery as a faulty battery if the current battery data is within the fault value range defined by the fault identification condition; A determination module, configured to determine that the current battery is in a to-be-alarmed state; A cut-off module, configured to cut off the high voltage of the current battery if the current battery is in the to-be-alarmed state and it is determined through the vehicle battery anomaly determination strategy that the current conditions have met the preset alarm conditions for vehicle battery thermal runaway alarm; A generation module, configured to generate a thermal runaway alarm information.

9. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is executed on a computer, the computer is made to execute the method according to any one of claims 1 to 7.

10. A vehicle, characterized in that, It includes a memory and a processor, and an executable code is stored in the memory. When the processor executes the executable code, the method according to any one of claims 1 to 7 is implemented.

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