CN111114328A - Thermal runaway early warning method, device and system for power storage battery of electric automobile - Google Patents
Thermal runaway early warning method, device and system for power storage battery of electric automobile Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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Abstract
The invention discloses a thermal runaway early warning method, device and system for a power storage battery of an electric automobile. The method comprises the following steps: acquiring air pressure data in the storage battery pack; when the air pressure data is abnormal, sending a verification request to a battery management system to obtain data to be verified in the storage battery pack; and when the data to be verified meet the preset conditions, sending a thermal runaway alarm signal to the whole vehicle. The thermal runaway phenomenon can be timely found by detecting the air pressure data in the storage battery pack, the problem of untimely alarm is avoided, and the timeliness of alarm is improved. In addition, when the air pressure data is abnormal, the data to be verified is further verified, the phenomenon of false alarm and missing alarm is avoided, and the accuracy of alarm is improved.
Description
Technical Field
The embodiment of the invention relates to a battery management technology, in particular to a thermal runaway early warning method, device and system for a power storage battery of an electric automobile.
Background
With the outstanding problems of energy consumption, resource shortage and environmental pollution caused by automobiles, electric automobiles are concerned as energy-saving and environment-friendly vehicles due to the obvious advantages of high efficiency, energy conservation and low emission. The lithium ion power battery has the characteristics of high specific energy, low self-discharge rate and long cycle life, and is the most practical pure electric vehicle energy source at present.
However, with the large-scale application of lithium ion batteries to electric vehicles, safety accidents of lithium ion power batteries, represented by thermal runaway, sometimes occur. Lithium ion power battery accidents are usually manifested by phenomena of temperature shock, smoke, fire and even explosion, which take thermal runaway as a core. Thermal runaway accidents often release large amounts of energy in a short period of time, and are very likely to cause casualties and property losses. Therefore, the thermal runaway accident can attack the confidence that people accept the electric automobile and prevent the electric automobile from being popularized.
The thermal runaway can be caused by a plurality of reasons, and the thermal runaway can be caused by the accumulation of heat inside the battery due to the internal puncture, overcharge, overdischarge, internal short circuit and the like caused by the common mechanical collision, external puncture, extrusion, and the growth of lithium metal dendrite.
Relevant researches show that at present, no absolutely reliable method is available for avoiding the occurrence of thermal runaway and the spread of the thermal runaway in a battery system, so that a thermal runaway early warning is necessary before the occurrence of the thermal runaway in order to reduce the harm of the thermal runaway.
Disclosure of Invention
The invention provides a thermal runaway early warning method, device and system for a power storage battery of an electric vehicle, which are used for avoiding the phenomena of untimely warning and false warning and missing warning and improving the accuracy and timeliness of warning.
In a first aspect, an embodiment of the present invention provides an early warning method for thermal runaway of a power storage battery of an electric vehicle, including:
acquiring air pressure data in the storage battery pack;
when the air pressure data is abnormal, sending a checking request to a battery management system to acquire data to be checked in the storage battery pack;
and when the data to be verified meet the preset conditions, sending a thermal runaway alarm signal to the whole vehicle.
Optionally, the air pressure data includes an air pressure value and an air pressure change rate;
the barometric pressure data anomaly comprises: the air pressure value is greater than or equal to an air pressure threshold value, and/or the air pressure change rate is greater than or equal to an air pressure change threshold value.
Optionally, the data to be verified includes a cell voltage value and a change rate of the cell voltage in the battery pack, and the data to be verified satisfies a preset condition, including:
the minimum value of the cell voltage value is less than or equal to a voltage threshold value, and/or the rate of change of the cell voltage is greater than or equal to a voltage change threshold value.
Optionally, the data to be verified includes a cell temperature value and a change rate of the cell temperature in the battery pack, and the data to be verified satisfies a preset condition, including:
the maximum value of the monomer temperature value is greater than or equal to a temperature threshold value, and/or the rate of change of the monomer temperature is greater than or equal to a temperature change threshold value.
Optionally, the method for warning thermal runaway of the power storage battery of the electric vehicle further includes:
and when the data to be verified is determined not to meet the preset conditions, recording the verification request event, wherein the verification request event comprises the air pressure data and the time of the verification request.
Optionally, when the air pressure data is abnormal, sending a verification request to the battery management system includes:
determining a current state of a battery management system;
and when the current state is a dormant state, sending an activation instruction to the battery management system based on the verification request so that the battery management system enters a working state, and acquiring the data to be verified by the battery management system in the working state.
In a second aspect, an embodiment of the present invention further provides an early warning device for thermal runaway of a power storage battery of an electric vehicle, including:
the air pressure data acquisition module is used for acquiring air pressure data in the storage battery pack;
the checking request sending module is used for sending a checking request to a battery management system when the air pressure data is abnormal so as to obtain the data to be checked in the storage battery pack;
and the alarm signal sending module is used for sending a thermal runaway alarm signal to the whole vehicle when the data to be verified meet the preset conditions.
In a third aspect, an embodiment of the present invention further provides a computer device, including:
one or more processors;
a memory for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors implement the method for warning thermal runaway of the power storage battery of the electric vehicle according to the first aspect of the invention.
In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for warning thermal runaway of the power storage battery of an electric vehicle according to the first aspect of the present invention.
In a fifth aspect, an embodiment of the present invention further provides an early warning system for thermal runaway of a power storage battery of an electric vehicle, including: the device comprises a controller, an air pressure collector and a battery management system;
the air pressure collector is used for collecting air pressure data in the storage battery pack and sending the air pressure data to the controller;
the controller is used for sending a verification request to the battery management system when determining that the air pressure data in the storage battery pack is abnormal;
the battery management system is used for acquiring data to be verified in the storage battery pack based on the verification request and sending the data to be verified to the controller;
and the controller is also used for sending a thermal runaway alarm signal to the whole vehicle when the data to be verified meet the preset conditions.
According to the thermal runaway early warning method for the power storage battery of the electric automobile, provided by the embodiment of the invention, air pressure data in the storage battery pack is obtained; when the air pressure data is abnormal, sending a verification request to a battery management system to obtain data to be verified in the storage battery pack; and when the data to be verified meet the preset conditions, sending a thermal runaway alarm signal to the whole vehicle. The thermal runaway phenomenon can be timely found by detecting the air pressure data in the storage battery pack, the problem of untimely alarm is avoided, and the timeliness of alarm is improved. In addition, when the air pressure data is abnormal, the data to be verified is further verified, the phenomenon of false alarm and missing alarm is avoided, and the accuracy of alarm is improved.
Drawings
Fig. 1 is a flowchart of a thermal runaway early warning method for a power storage battery of an electric vehicle according to an embodiment of the invention;
fig. 2 is a logic diagram of a thermal runaway early warning method for a power storage battery of an electric vehicle according to a second embodiment of the invention;
fig. 3 is a schematic structural diagram of a thermal runaway early warning system for a power storage battery of an electric vehicle according to a third embodiment of the invention;
fig. 4 is a schematic structural diagram of a thermal runaway early warning device for a power storage battery of an electric vehicle according to a fourth embodiment of the invention;
fig. 5 is a schematic structural diagram of a computer device according to a fifth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
The embodiment of the invention provides a thermal runaway early warning method for a power storage battery of an electric automobile, which is suitable for the situation that thermal runaway early warning is given before the thermal runaway of the power storage battery of the electric automobile occurs. The method is applied to a battery management system and can be executed by the thermal runaway early warning device for the power storage battery of the electric vehicle, which can be realized by software and/or hardware and is generally configured in the battery management system. Fig. 1 is a flowchart of a thermal runaway warning method for a power storage battery of an electric vehicle according to an embodiment of the present invention, and as shown in fig. 1, the method specifically includes the following steps:
s101, acquiring air pressure data in the storage battery pack.
The battery pack generally includes a plurality of single batteries, the plurality of single batteries form a battery pack in a series-parallel connection mode, and the battery pack is fixed in a sealed shell to form the battery pack.
Because the battery package is encapsulated, the battery thermal runaway can release a large amount of gas simultaneously for the inside atmospheric pressure of battery package increases, consequently, can gather the atmospheric pressure data in the battery package through the atmospheric pressure collector. The air pressure collector is arranged in the storage battery pack and used for collecting air pressure data in the storage battery pack. The air pressure data includes an air pressure value and an air pressure change rate.
And S102, when the air pressure data is abnormal, sending a verification request to the battery management system.
After the air pressure data is obtained, the air pressure data is compared, and when the air pressure data is determined to be abnormal, a verification request is sent to a Battery Management System (BMS).
The single batteries are manufactured independently, and due to the manufacturing process and the electrochemical characteristics of the batteries, in the storage battery pack after delivery, the internal resistance, the capacity, the voltage and the like of each single battery are different, and the energy storage consistency is also different. Therefore, in practical application, each single battery in the storage battery pack is prone to phenomena such as uneven heat dissipation, excessive charge and discharge and the like. As soon as time passes, the single batteries in the poor working state are likely to be damaged in advance, so that the overall service life of the storage battery pack is greatly shortened. The battery management system can effectively monitor, protect, balance energy and alarm faults of each single battery in the storage battery pack, avoid the situations of overcharge, overdischarge and the like of the single batteries, and further improve the working efficiency and the service life of the whole storage battery pack.
Illustratively, in one embodiment of the invention, the barometric pressure data anomalies include: the air pressure value is greater than or equal to an air pressure threshold, or the air pressure change rate is greater than or equal to an air pressure change threshold, and the air pressure threshold is 1.5 standard atmospheres for example, and the air pressure change threshold is 12 KPa/s.
It should be noted that, in practical cases, the air pressure value and the air pressure change rate are usually associated, and when the air pressure value reaches the air pressure threshold, the air pressure change rate will reach the air pressure change threshold at the same time, therefore, in another embodiment of the present invention, the air pressure data abnormality may also be that the air pressure value is greater than or equal to the air pressure threshold, and the air pressure change rate is greater than or equal to the air pressure change threshold.
The check data acquisition unit is integrated in the storage battery pack and used for acquiring data to be checked in the storage battery pack and sending the data to the BMS, and then the data to be checked can be acquired through the BMS.
Illustratively, in one embodiment of the invention, the data to be verified includes the voltage (i.e., cell voltage value) of each cell in the battery pack and the rate of change of the cell voltage. The data acquisition unit may include a voltage collector.
Illustratively, in another embodiment of the invention, the data to be verified includes the temperature of each cell in the battery pack (i.e., the cell temperature value) and the rate of change of the cell temperature. The data acquisition unit may include a temperature sensor.
Illustratively, in another embodiment of the invention, the data to be verified comprises the temperature of each single battery (i.e. the single temperature value) and the change rate of the single temperature in the storage battery pack, and the temperature of each single battery (i.e. the single temperature value) and the change rate of the single temperature. The data acquisition unit may include a voltage collector and a temperature sensor.
S103, when the data to be verified meet the preset conditions, sending a thermal runaway alarm signal to the whole vehicle.
Illustratively, after the data to be verified is acquired, the data to be verified is verified, and whether the data to be verified meets a preset condition is determined.
For example, in one embodiment of the present invention, when the minimum value of the cell voltage values of the respective cells is less than or equal to the voltage threshold, or the change rate of the cell voltages is greater than or equal to the voltage change threshold, it is determined that the data to be verified satisfies the preset condition. Illustratively, the voltage threshold is 2.75V and the voltage variation threshold is 0.3V/s.
It should be noted that, in an actual situation, the cell voltage value and the voltage change rate are usually associated, and when the cell voltage value of a certain cell reaches the voltage threshold, the voltage change rate of the cell will reach the voltage change threshold at the same time, therefore, in another embodiment of the present invention, it may also be that the cell voltage value is greater than or equal to the voltage threshold, and when the voltage change rate is greater than or equal to the voltage change threshold, it is determined that the data to be verified satisfies the preset condition.
For example, in one embodiment of the present invention, when the maximum value of the cell temperature values of the individual cells is greater than or equal to the temperature threshold value, or the change rate of the cell temperature is greater than or equal to the temperature change threshold value, it is determined that the data to be verified satisfies the preset condition. Illustratively, the temperature threshold is 85 ℃ and the temperature change threshold is 3 ℃/s.
It should be noted that, in an actual situation, the monomer temperature value and the temperature change rate are usually associated, and when the monomer temperature value of a certain monomer reaches the temperature threshold, the temperature change rate of the certain monomer reaches the temperature change threshold at the same time, therefore, in another embodiment of the present invention, it may also be that the monomer temperature value is greater than or equal to the temperature threshold, and when the temperature change rate is greater than or equal to the temperature change threshold, it is determined that the data to be verified satisfies the preset condition.
In another embodiment of the present invention, when the maximum value of the cell temperature value of each cell is greater than or equal to the temperature threshold, or the change rate of the cell temperature is greater than or equal to the temperature change threshold, or when the minimum value of the cell voltage value of each cell is less than or equal to the voltage threshold, or the change rate of the cell voltage is greater than or equal to the voltage change threshold, that is, any one of the four conditions is satisfied, it may be determined that the data to be verified satisfies the preset condition.
When the data to be verified meet the preset conditions, a thermal runaway alarm signal is sent to the central control unit of the whole vehicle in a CAN bus or hard wire mode, a driver is reminded to take reasonable measures (such as turning off power output and the like) in a sound or flashing light mode to prevent further accident deterioration, and the vehicle is timely dropped.
In the prior art, the thermal early warning scheme is used for acquiring single temperature of a single battery and performing thermal runaway early warning according to the single temperature. However, the temperature variation has a certain hysteresis compared with the air pressure variation, and at present, not every single battery in the storage battery pack is provided with a temperature sensor, so that the data collected by the temperature sensor has a certain limitation. Further, even the same unit cell has a local temperature difference. Therefore, the thermal early warning scheme in the prior art has the phenomena of untimely warning, false warning and missing warning, and brings great risks to the personal and property safety of drivers and passengers.
According to the thermal runaway early warning method for the power storage battery of the electric automobile, provided by the embodiment of the invention, air pressure data in the storage battery pack is obtained; when the air pressure data is abnormal, sending a verification request to a battery management system to obtain data to be verified in the storage battery pack; and when the data to be verified meet the preset conditions, sending a thermal runaway alarm signal to the whole vehicle. The thermal runaway phenomenon can be timely found by detecting the air pressure data in the storage battery pack, the problem of untimely alarm is avoided, and the timeliness of alarm is improved. In addition, when the air pressure data is abnormal, the data to be verified is further verified, the phenomenon of false alarm and missing alarm is avoided, and the accuracy of alarm is improved.
For example, in another embodiment of the present invention, when it is determined that the data to be verified does not satisfy the preset condition, that is, when the minimum value of the cell voltage value is greater than the voltage threshold and the change rate of the cell voltage is less than the voltage change threshold, or when the maximum value of the cell temperature value is less than the temperature threshold and the change rate of the cell temperature is less than the temperature change threshold, the verification request event is recorded. The verification request event comprises the air pressure value and the air pressure change rate acquired by the air pressure acquisition unit, the time for sending the verification request and the generation of a log. The method and the device can be used for analyzing the reason of the request event subsequently and adjusting the air pressure threshold value, so that the accuracy of judgment of air pressure data is improved, the check request is timely and accurately sent to the battery management system, and the false alarm is avoided.
Illustratively, in another embodiment of the present invention, the data to be verified includes cell voltage data (including a cell voltage value and a cell voltage variation) and cell temperature data (including a cell temperature value and a cell temperature variation rate). Corresponding weight values can be configured when the air pressure data, the cell voltage data and the cell temperature data are abnormal, namely, the corresponding weight values are configured when the air pressure data, the cell voltage data and the cell temperature data exceed corresponding threshold values respectively. For example, a first weight value is configured when the air pressure data is abnormal, a second weight value is configured when the cell voltage data is abnormal, and a third weight value is configured when the cell temperature data is abnormal. And when the sum of the configured first weight value, the second weight value and the third weight value is greater than a preset weight value, sending a thermal runaway alarm signal to the whole vehicle.
Since the air pressure data can reflect the thermal runaway phenomenon more timely and sensitively, for example, in the embodiment of the present invention, the first weight value is greater than the second weight value and the third weight value, so as to increase the weight value of the air pressure data.
Illustratively, when an abnormality occurs in the data, the first weight value is configured to be 60%, the second weight value and the third weight value are both configured to be 20%, and the preset weight value is 80%. When the air pressure data is abnormal, a first weight value (60%) is configured, the data to be checked is further verified, when the cell voltage data is abnormal and/or the cell temperature data is abnormal, the configured total weight value is larger than or equal to a preset weight value (80%), and then a thermal runaway alarm signal is sent to the whole vehicle.
For example, when the air pressure data is abnormal, a first weight value (60%) is configured, the data to be verified is further verified, when the single voltage data is abnormal, a second weight value (20%) is configured, the single temperature data is not abnormal, and a third weight value is not configured, namely the third weight value is 0, so that the configured total weight value is 80%, and a thermal runaway alarm signal can be sent to the whole vehicle; when the air pressure data is abnormal, a first weight value (60%) is configured, the data to be verified is further verified, when the single voltage data is abnormal, a second weight value (20%) is configured, and when the single temperature data is abnormal, a third weight value (20%) is configured, so that the total configured weight value is 100% and is greater than 80%, and a thermal runaway alarm signal can be sent to the whole vehicle.
It should be noted that specific values of the first weight value, the second weight value, and the third weight value may be set according to requirements, and the embodiment of the present invention is not limited herein.
Example two
The second embodiment of the present invention provides another warning method for thermal runaway of a power storage battery of an electric vehicle, and fig. 2 is a logic diagram of the warning method for thermal runaway of the power storage battery of the electric vehicle according to the second embodiment of the present invention, and this embodiment details a specific process of acquiring data to be verified by a battery management system on the basis of the first embodiment, as shown in fig. 2, the method includes:
s201, acquiring air pressure data in the storage battery pack.
S202, judging whether the air pressure data is abnormal or not.
Specifically, the abnormality determination of the air pressure data has been described in detail in the foregoing embodiments, and the embodiments of the present invention are not described herein again.
If the air pressure data is abnormal, step S203 is executed, and if the air pressure data is normal, the early warning process is ended.
S203, judging whether the battery management system is in a dormant state.
For example, the battery management system may have two different states, e.g., an active state and a sleep state. The sleep state may be a state where the battery management system is located after the vehicle is turned off, and the working state may be a state where the battery management system is located when the vehicle is in operation. The battery management system can determine the state of the battery management system through the state identification code. When the current state of the battery management system is the dormant state, executing step S204; when the current state of the battery management system is the operating state, step S205 is performed.
And S204, sending an activation instruction to the battery management system according to the verification request.
And the battery management system in the dormant state is activated and enters a working state when receiving the activation instruction, and the battery management system acquires the data to be checked in the working state.
And S205, acquiring data to be checked in the storage battery pack.
Illustratively, the data to be checked in the storage battery pack is acquired by a battery management system.
The battery management system sends a data request to the data acquisition unit in a working state, and the data acquisition unit responds to the data request and returns data to be verified to the battery management system.
S206, judging whether the data to be verified meet preset conditions or not, and executing the step S207 when the data to be verified meet the preset conditions; and when the data to be verified does not meet the preset condition, executing the step S208.
Specifically, in the embodiment of the present invention, the data to be verified includes a maximum value of the cell temperature value, a change rate of the cell temperature, a minimum value of the cell voltage value, and a change rate of the cell voltage.
When the maximum value of the cell temperature value of each cell is greater than or equal to the temperature threshold value, or the change rate of the cell temperature is greater than or equal to the temperature change threshold value, or when the minimum value of the cell voltage value of each cell is less than or equal to the voltage threshold value, or the change rate of the cell voltage is greater than or equal to the voltage change threshold value, that is, any one of the four conditions is satisfied, it can be determined that the data to be verified satisfies the preset condition.
And S207, sending a thermal runaway alarm signal to the whole vehicle.
And S208, recording the verification request event.
And when the data to be verified does not meet the preset conditions, namely the four conditions are not met, recording the verification request event. The verification request event comprises air pressure data, data to be verified, time for sending a verification request and log generation. The reason of the request event is analyzed subsequently, the reason of the false alarm is searched and adjusted, and the false alarm is avoided.
According to the thermal runaway early warning method for the power storage battery of the electric automobile, provided by the embodiment of the invention, air pressure data in the storage battery pack is obtained; when the air pressure data is abnormal, sending a verification request to a battery management system to obtain data to be verified in the storage battery pack; and when the data to be verified meet the preset conditions, sending a thermal runaway alarm signal to the whole vehicle. The thermal runaway phenomenon can be timely found by detecting the air pressure data in the storage battery pack, the problem of untimely alarm is avoided, and the timeliness of alarm is improved. In addition, when the air pressure data is abnormal, the data to be verified is further verified, the phenomenon of false alarm and missing alarm is avoided, and the accuracy of alarm is improved.
Illustratively, in another embodiment of the present invention, the data to be verified includes cell voltage data (including a cell voltage value and a cell voltage variation) and cell temperature data (including a cell temperature value and a cell temperature variation rate). Corresponding weight values can be configured when the air pressure data, the cell voltage data and the cell temperature data are abnormal, namely, the corresponding weight values are configured when the air pressure data, the cell voltage data and the cell temperature data exceed corresponding threshold values respectively. For example, a first weight value is configured when the air pressure data is abnormal, a second weight value is configured when the cell voltage data is abnormal, and a third weight value is configured when the cell temperature data is abnormal. And when the sum of the configured first weight value, the second weight value and the third weight value is greater than a preset weight value, sending a thermal runaway alarm signal to the whole vehicle.
Since the air pressure data can reflect the thermal runaway phenomenon more timely and sensitively, for example, in the embodiment of the present invention, the first weight value is greater than the second weight value and the third weight value, so as to increase the weight value of the air pressure data.
For example, when the battery management system is in a sleep state, when an abnormality occurs in data, the first weight value is configured to be 50%, the second weight value and the third weight value are both configured to be 25%, and the preset weight value is 75%. When the air pressure data is abnormal, a first weight value (50%) is configured, after the battery management system is awakened, the data to be verified is further verified, when the single voltage data is abnormal and/or the temperature data is abnormal, the configured total weight value is larger than or equal to a preset weight value (75%), and then a thermal runaway alarm signal is sent to the whole vehicle.
For example, when a battery management system is in a dormant state, if the air pressure data is abnormal, a first weight value (50%) is configured, after the battery management system is awakened, data to be verified is further verified, when the cell voltage data is abnormal, a second weight value (25%) is configured, and the cell temperature data is not abnormal, a third weight value is not configured, namely the third weight value is 0, so that the total configured weight value is 75%, and a thermal runaway alarm signal can be sent to the whole vehicle; if the air pressure data is abnormal, a first weight value (50%) is configured, after the battery management system is awakened, the data to be verified is further verified, when the cell voltage data is abnormal, a second weight value (25%) is configured, and when the cell temperature data is abnormal, a third weight value (25%) is configured, so that the total configured weight value is 100% and is more than 75%, and a thermal runaway alarm signal can be sent to the whole vehicle.
For example, when the battery management system is in an operating state, if the air pressure data is abnormal, the first weight value is configured to be 60%, the second weight value and the third weight value are both configured to be 20%, and the preset weight value is 80%. When the air pressure data is abnormal, a first weight value (60%) is configured, the data to be checked is further verified, when the cell voltage data is abnormal and/or the cell temperature data is abnormal, the configured total weight value is larger than or equal to a preset weight value (80%), and then a thermal runaway alarm signal is sent to the whole vehicle.
For example, when the battery management system is in an operating state, if the air pressure data is abnormal, a first weight value (60%) is configured, the data to be verified is further verified, and when the cell voltage data is abnormal, a second weight value (20%) is configured, and the cell temperature data is not abnormal, a third weight value is not configured, namely the third weight value is 0, so that the total configured weight value is 80%, and a thermal runaway alarm signal can be sent to the whole vehicle; when the air pressure data is abnormal, a first weight value (60%) is configured, the data to be verified is further verified, when the single voltage data is abnormal, a second weight value (20%) is configured, and when the single temperature data is abnormal, a third weight value (20%) is configured, so that the total configured weight value is 100% and is greater than 80%, and a thermal runaway alarm signal can be sent to the whole vehicle.
It should be noted that specific values of the first weight value, the second weight value, and the third weight value may be set according to requirements, and the embodiment of the present invention is not limited herein.
EXAMPLE III
The third embodiment of the present invention provides a thermal runaway early warning system for a power storage battery of an electric vehicle, and fig. 3 is a schematic structural diagram of the thermal runaway early warning system for the power storage battery of the electric vehicle provided by the third embodiment of the present invention, as shown in fig. 3, the system includes:
a controller 310, a gas pressure collector 320 and a battery management system 330;
the air pressure collector 320 is used for collecting air pressure data in the storage battery pack and sending the air pressure data to the controller 310;
the controller 310 is configured to send a verification request to the battery management system 330 when it is determined that the air pressure data in the battery pack is abnormal;
the battery management system 330 is configured to obtain data to be verified in the battery pack based on the verification request, and send the data to be verified to the controller 310;
the controller 310 is further configured to send a thermal runaway alarm signal to the entire vehicle when it is determined that the data to be verified meets a preset condition.
Illustratively, in embodiments of the present invention, the air pressure data includes an air pressure value and an air pressure change rate. The air pressure data anomaly may be an air pressure value greater than or equal to an air pressure threshold and an air pressure change rate greater than or equal to an air pressure change threshold.
The data to be verified comprises the maximum value of the monomer temperature value, the change rate of the monomer temperature, the minimum value of the monomer voltage value and the change rate of the monomer voltage.
When the maximum value of the cell temperature value of each cell is greater than or equal to the temperature threshold value, or the change rate of the cell temperature is greater than or equal to the temperature change threshold value, or when the minimum value of the cell voltage value of each cell is less than or equal to the voltage threshold value, or the change rate of the cell voltage is greater than or equal to the voltage change threshold value, that is, any one of the four conditions is satisfied, it can be determined that the data to be verified satisfies the preset condition.
The battery management system may be connected to the voltage collector 341 and the temperature sensor 342, and the voltage collector 341 and the temperature sensor 342 are respectively configured to obtain a cell voltage value of each cell and a cell temperature value of each cell.
The thermal runaway early warning system for the power storage battery of the electric automobile comprises a controller, an air pressure collector and a battery management system, wherein the controller is used for controlling the air pressure collector to collect the thermal runaway of the power storage battery; the air pressure collector is used for collecting air pressure data in the storage battery pack and sending the air pressure data to the controller; the controller is used for sending a verification request to the battery management system when the atmospheric pressure data in the storage battery pack is determined to be abnormal; the battery management system is used for acquiring data to be checked in the storage battery pack based on the checking request and sending the data to be checked to the controller; the controller is also used for sending a thermal runaway alarm signal to the whole vehicle when the data to be verified meet the preset conditions. The thermal runaway phenomenon can be timely found by detecting the air pressure data in the storage battery pack, the problem of untimely alarm is avoided, and the timeliness of alarm is improved. In addition, when the air pressure data is abnormal, the data to be verified is further verified, the phenomenon of false alarm and missing alarm is avoided, and the accuracy of alarm is improved.
Example four
The fourth embodiment of the present invention provides an electric vehicle power storage battery thermal runaway early warning device, fig. 4 is a schematic structural diagram of the electric vehicle power storage battery thermal runaway early warning device provided by the fourth embodiment of the present invention, and as shown in fig. 4, the device includes:
the air pressure data acquisition module 410 is used for acquiring air pressure data in the storage battery pack;
a verification request sending module 420, configured to send a verification request to a battery management system when the air pressure data is abnormal, so as to obtain data to be verified in the storage battery pack;
and the alarm signal sending module 430 is configured to send a thermal runaway alarm signal to the whole vehicle when it is determined that the data to be verified meets the preset condition.
Illustratively, the air pressure data includes an air pressure value and an air pressure change rate;
the barometric pressure data anomaly comprises: the air pressure value is greater than or equal to an air pressure threshold value, and/or the air pressure change rate is greater than or equal to an air pressure change threshold value.
Illustratively, the data to be verified includes a cell voltage value and a change rate of the cell voltage in the battery pack, and the data to be verified satisfies a preset condition, including:
the minimum value of the cell voltage value is less than or equal to a voltage threshold value, and/or the rate of change of the cell voltage is greater than or equal to a voltage change threshold value.
Illustratively, the data to be verified includes a cell temperature value and a change rate of the cell temperature in the battery pack, and the data to be verified satisfies a preset condition, including:
the maximum value of the monomer temperature value is greater than or equal to a temperature threshold value, and/or the rate of change of the monomer temperature is greater than or equal to a temperature change threshold value.
The apparatus further includes a recording module, configured to record the verification request event when it is determined that the data to be verified does not satisfy the preset condition, where the verification request event includes the air pressure data and a time of the verification request.
For example, the verification request sending module 420 may include:
a state determination unit for determining a current state of the battery management system;
and the activation instruction sending unit is used for sending an activation instruction to the battery management system based on the verification request when the current state is the dormant state so as to enable the battery management system to enter a working state, and the battery management system acquires the data to be verified in the working state.
The thermal runaway early warning device for the power storage battery of the electric vehicle, provided by the embodiment of the invention, can execute the thermal runaway early warning method for the power storage battery of the electric vehicle, provided by the embodiment of the invention, and has corresponding functions and beneficial effects.
EXAMPLE five
An embodiment of the present invention provides a computer device, and fig. 5 is a schematic structural diagram of the computer device provided in the embodiment of the present invention, as shown in fig. 5, the computer device includes: a processor 501, a memory 502, a communication module 503, an input device 504, and an output device 505; the number of the processors 501 in the computer device may be one or more, and one processor 501 is taken as an example in fig. 5; the processor 501, the memory 502, the communication module 503, the input device 504 and the output device 505 in the computer apparatus may be connected by a bus or other means, and the connection by the bus is exemplified in fig. 5. The processor 501, the memory 502, the communication module 503, the input device 504 and the output device 505 may be integrated on a control board of the computer apparatus.
The memory 502 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as the modules corresponding to the thermal runaway warning method for an electric vehicle power storage battery in the above embodiments (for example, the air pressure data acquiring module 410, the verification request sending module 420, and the alarm signal sending module 430 in an electric vehicle power storage battery thermal runaway warning device). The processor 501 executes various functional applications and data processing of the computer device by running the software programs, instructions and modules stored in the memory 502, that is, the method for warning the thermal runaway of the power storage battery of the electric vehicle is realized.
The memory 502 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the microcomputer, and the like. Further, the memory 502 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 502 may further include memory located remotely from processor 501, which may be connected to an electronic device through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The communication module 503 is configured to establish a connection with an external device (e.g., a smart terminal), and implement data interaction with the external device. The input device 504 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function controls of the computer apparatus.
The computer device provided by the embodiment can execute the thermal runaway early warning method for the power storage battery of the electric vehicle provided by the first embodiment and the second embodiment of the invention, and has corresponding functions and beneficial effects.
EXAMPLE six
The sixth embodiment of the present invention provides a storage medium containing computer executable instructions, where the storage medium stores a computer program, and the computer program, when executed by a processor, implements the method for warning thermal runaway of an electric vehicle power storage battery according to any of the above embodiments of the present invention.
Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the method operations described above, and may also perform related operations in the method for warning thermal runaway of the power storage battery of the electric vehicle provided by the embodiments of the present invention.
It should be noted that, as for the apparatus, the device and the storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and in relevant places, reference may be made to the partial description of the method embodiments.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk, or an optical disk of a computer, and includes several instructions to enable a computer device (which may be a robot, a personal computer, a server, or a network device) to execute the method for warning thermal runaway of an electric vehicle power storage battery according to any embodiment of the present invention.
It should be noted that, in the above apparatus, each unit and each module included in the apparatus are merely divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by suitable instruction execution devices. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The thermal runaway early warning method for the power storage battery of the electric automobile is characterized by comprising the following steps of:
acquiring air pressure data in the storage battery pack;
when the air pressure data is abnormal, sending a checking request to a battery management system to acquire data to be checked in the storage battery pack;
and when the data to be verified meet the preset conditions, sending a thermal runaway alarm signal to the whole vehicle.
2. The thermal runaway early warning method for the power storage battery of the electric automobile according to claim 1, wherein the air pressure data comprises an air pressure value and an air pressure change rate;
the barometric pressure data anomaly comprises: the air pressure value is greater than or equal to an air pressure threshold value, and/or the air pressure change rate is greater than or equal to an air pressure change threshold value.
3. The thermal runaway early warning method for the power storage battery of the electric automobile according to claim 1, wherein the data to be verified comprise a cell voltage value and a change rate of the cell voltage in the storage battery pack, and the data to be verified meet a preset condition, and the method comprises the following steps:
the minimum value of the cell voltage value is less than or equal to a voltage threshold value, and/or the rate of change of the cell voltage is greater than or equal to a voltage change threshold value.
4. The thermal runaway early warning method for the power storage battery of the electric automobile according to claim 1, wherein the data to be verified comprise a monomer temperature value and a change rate of the monomer temperature in the storage battery pack, and the data to be verified meet a preset condition, and the method comprises the following steps:
the maximum value of the monomer temperature value is greater than or equal to a temperature threshold value, and/or the rate of change of the monomer temperature is greater than or equal to a temperature change threshold value.
5. The electric vehicle power storage battery thermal runaway early warning method according to any one of claims 1 to 4, further comprising:
and when the data to be verified is determined not to meet the preset conditions, recording the verification request event, wherein the verification request event comprises the air pressure data and the time of the verification request.
6. The warning method for thermal runaway of a power storage battery of an electric vehicle as claimed in claim 5, wherein when the air pressure data is abnormal, sending a verification request to a battery management system comprises:
determining a current state of a battery management system;
and when the current state is a dormant state, sending an activation instruction to the battery management system based on the verification request so that the battery management system enters a working state, and acquiring the data to be verified by the battery management system in the working state.
7. The utility model provides an electric automobile power battery thermal runaway early warning device which characterized in that includes:
the air pressure data acquisition module is used for acquiring air pressure data in the storage battery pack;
the checking request sending module is used for sending a checking request to a battery management system when the air pressure data is abnormal so as to obtain the data to be checked in the storage battery pack;
and the alarm signal sending module is used for sending a thermal runaway alarm signal to the whole vehicle when the data to be verified meet the preset conditions.
8. A computer device, comprising:
one or more processors;
a memory for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors are enabled to implement the method for warning thermal runaway of the power storage battery of the electric vehicle as set forth in any one of claims 1 to 6.
9. A computer-readable storage medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the warning method for thermal runaway of a power storage battery of an electric vehicle according to any one of claims 1 to 6.
10. The utility model provides an electric automobile power battery thermal runaway early warning system which characterized in that includes: the device comprises a controller, an air pressure collector and a battery management system;
the air pressure collector is used for collecting air pressure data in the storage battery pack and sending the air pressure data to the controller;
the controller is used for sending a verification request to the battery management system when determining that the air pressure data in the storage battery pack is abnormal;
the battery management system is used for acquiring data to be verified in the storage battery pack based on the verification request and sending the data to be verified to the controller;
and the controller is also used for sending a thermal runaway alarm signal to the whole vehicle when the data to be verified meet the preset conditions.
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