CN114454774B - Battery pack thermal runaway early warning system and method - Google Patents
Battery pack thermal runaway early warning system and method Download PDFInfo
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- CN114454774B CN114454774B CN202210006248.3A CN202210006248A CN114454774B CN 114454774 B CN114454774 B CN 114454774B CN 202210006248 A CN202210006248 A CN 202210006248A CN 114454774 B CN114454774 B CN 114454774B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000005540 biological transmission Effects 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims description 66
- 230000002159 abnormal effect Effects 0.000 claims description 21
- 239000000779 smoke Substances 0.000 claims description 16
- 230000005856 abnormality Effects 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 9
- 238000011161 development Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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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
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
-
- 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
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a battery pack thermal runaway early warning system and a method, wherein the method for early warning the battery Bao Re of runaway comprises the following steps: collecting thermal runaway related information of a battery pack; carrying out data transmission on the thermal runaway associated information so as to enable a whole vehicle control system to acquire the thermal runaway associated information; acquiring historical thermal runaway associated information before the transmission failure of the thermal runaway associated information, and when the historical thermal runaway associated information is matched with a preset first early warning threshold value, carrying out thermal runaway early warning on the battery pack according to the historical thermal runaway associated information; the reliability and the accuracy of the battery pack thermal runaway early warning are improved, so that the potential safety hazard of the thermal runaway of the battery pack of the electric automobile is reduced.
Description
Technical Field
The application relates to the technical field of thermal runaway management of battery packs, in particular to a thermal runaway early warning system and method for battery packs.
Background
With the rapid development of new energy automobiles and in order to reduce environmental pollution caused by fuel automobiles, the electric power system of an automobile has gradually become a mainstream development trend, and meanwhile, a power battery for storing driving energy of an automobile belongs to the core development direction of the new energy automobiles.
The most popular lithium ion battery at present has the characteristics of high energy, low self-discharge rate and long cycle life, but with more and more new energy automobiles being put into the market, the safety accident of the lithium ion power battery represented by thermal runaway occurs, so the thermal runaway early warning about the power battery becomes necessary and effective safety guarantee for the power battery.
The detection method of the power battery system in the prior art is to detect and pre-warn by means of the battery management system and the thermal runaway detection system, so that fault pre-warn when the battery management system or the thermal runaway detection system fails can not be avoided, certain potential safety hazards still exist, and the life safety of passengers is further threatened.
Disclosure of Invention
The invention provides a battery pack thermal runaway early warning system method, which is used for improving the reliability and accuracy of battery pack thermal runaway early warning, so as to reduce the potential safety hazard of battery pack thermal runaway of an electric automobile.
In order to achieve the above purpose, the specific technical scheme of the battery pack thermal runaway early warning system and method of the invention is as follows:
in a first aspect, a thermal runaway warning method for a battery pack includes the steps of:
collecting thermal runaway related information of a battery pack;
carrying out data transmission on the thermal runaway associated information so as to enable a whole vehicle control system to acquire the thermal runaway associated information;
and acquiring historical thermal runaway associated information before the transmission failure of the thermal runaway associated information, and carrying out thermal runaway early warning on the battery pack according to the historical thermal runaway associated information when the historical thermal runaway associated information is matched with a preset first early warning threshold.
Optionally, the historical thermal runaway related information in a first preset time is obtained, and when the historical thermal runaway related information in the first preset time is matched with a preset first early warning threshold, the thermal runaway early warning of the battery pack is performed according to the historical thermal runaway related information.
Optionally, the historical thermal runaway related information includes a temperature of the battery pack and a voltage of the battery pack;
the first early warning threshold value comprises a temperature early warning threshold value of the battery pack and a voltage early warning threshold value of the battery pack;
and determining that a thermal runaway early warning fault occurs when the temperature of the battery pack is higher than a first early warning threshold value and/or the voltage of the battery pack is lower than the first early warning threshold value.
Optionally, the acquired thermal runaway associated information is matched with a preset second early warning threshold;
and when the thermal runaway associated information is matched with the second early warning threshold and the thermal runaway associated information is successfully transmitted, confirming that the condition of the battery Bao Re for losing control is met, and carrying out thermal runaway early warning on the battery pack according to the thermal runaway associated information.
Optionally, acquiring a plurality of temperatures of the detection modules for detecting the battery pack and a temperature rise rate of the detection modules;
the second early warning threshold comprises temperature early warning thresholds of a plurality of detection modules and temperature rising rate early warning thresholds of the detection modules;
when the temperatures of at least two detection modules are matched with the second early warning threshold, and the temperature rise rate of the detection modules is matched with the second early warning threshold, and the second preset time is continued, the out-of-control condition of the battery Bao Re is satisfied.
Optionally, acquiring the smoke concentration outside the battery pack;
the second early warning threshold value comprises a smoke concentration early warning threshold value outside the battery pack;
and when the smoke concentration at the outer side of the battery pack is matched with the second early warning threshold value and lasts for a third preset time, the condition that the battery Bao Re is out of control is met.
Optionally, acquiring the temperature outside the battery pack, the temperature rise rate outside the battery pack and the voltage inside the battery pack;
the second early warning threshold comprises a temperature early warning threshold outside the battery pack, a temperature rise rate early warning threshold outside the battery pack and a voltage early warning threshold inside the battery pack;
when the temperature outside the battery pack, the temperature rise rate outside the battery pack and the voltage inside the battery pack are respectively matched with the second early warning threshold value and last for a fourth preset time, the condition that the battery Bao Re is out of control is satisfied.
Optionally, acquiring the temperature inside the battery pack, the temperature rise rate inside the battery pack and the voltage inside the battery pack;
the second early warning threshold comprises a temperature early warning threshold inside the battery pack, a temperature rise rate early warning threshold inside the battery pack and a voltage early warning threshold inside the battery pack;
when the temperature inside the battery pack, the temperature rise rate inside the battery pack and the voltage inside the battery pack are respectively matched with the second early warning threshold value and last for a fifth preset time, the condition that the battery Bao Re is out of control is satisfied.
Optionally, the step of powering up the battery pack before use includes:
presetting a normal voltage threshold of the battery pack, and detecting abnormality of the battery pack before the battery pack is electrified;
acquiring a power-down request of the battery pack according to the abnormal data of the battery pack, and carrying out data transmission on the power-down request so as to enable the whole vehicle control system to acquire the power-down request;
when the whole vehicle control system acquires the power-down request, the whole vehicle control system controls the battery pack to power down.
In a second aspect, a battery pack thermal runaway warning system includes:
a thermal runaway detection unit for acquiring thermal runaway associated information;
the data transmission unit is used for data transmission of the thermal runaway associated information and is electrically connected with the thermal runaway detection unit;
and the thermal runaway early warning unit is electrically connected with the data transmission unit and is used for carrying out thermal runaway early warning on the battery pack according to the thermal runaway related information.
The battery pack thermal runaway early warning method has the following advantages: when the battery thermal runaway detection fails or fails, the whole vehicle control system cannot acquire thermal runaway related information through data transmission, and the whole vehicle control system executes thermal runaway early warning when determining that the battery pack is out of control according to the historical thermal runaway related information by acquiring the historical thermal runaway related information, so that the use safety and reliability of the thermal runaway early warning system are improved.
Drawings
FIG. 1 is a schematic diagram of a connection relationship between a plurality of execution units in a battery Bao Re runaway warning system according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of a method for warning of battery Bao Re of an embodiment of the present disclosure;
FIG. 3 is a flow chart of a method of warning of battery Bao Re of a runaway in one embodiment of the present application;
FIG. 4 is a flow chart of a method of warning of battery Bao Re of a runaway in another embodiment of the present application;
FIG. 5 is a flow chart of a thermal runaway determination condition of a battery Bao Re runaway warning method in one embodiment of the present application;
fig. 6 is a schematic flow chart of a battery pack power-on detection method in an embodiment of the present application;
FIG. 7 is a schematic diagram of the overall structure of a battery Bao Re runaway warning system according to an embodiment of the present application;
fig. 8 is an overall flowchart of a battery Bao Re runaway warning method in an embodiment of the present application.
Detailed Description
For a better understanding of the objects, structures and functions of the present invention, the exemplary embodiments described herein should be considered in descriptive sense only and not for purposes of limitation. The description of features or aspects in each exemplary embodiment should be generally considered to be applicable to similar features or aspects in other exemplary embodiments.
In the prior art of the mainstream, regarding the battery Bao Re out-of-control early warning system and method of the new energy automobile, mainly detect through the sensor, judge whether the battery pack has battery thermal out-of-control according to the detection result of the sensor, but along with more and more new energy automobiles being put into the market, because of different road conditions and different driving environments, often can lead to the sensor to detect failure or inaccurate detection result, thus there is a potential safety hazard, even security accident appears, in order to improve the safety in use of the battery pack, the application provides a battery pack thermal out-of-control early warning system and method, can improve the reliability of battery pack thermal out-of-control detection.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The application provides a battery package thermal runaway early warning system and method, as shown in fig. 1, battery Bao Re runaway early warning system includes: a thermal runaway detection unit for acquiring thermal runaway associated information; the data transmission unit is used for data transmission of the thermal runaway associated information and is electrically connected with the thermal runaway detection unit; and the thermal runaway early warning unit is electrically connected with the data transmission unit and is used for carrying out thermal runaway early warning on the battery pack according to the thermal runaway related information.
The thermal runaway detection unit is used for collecting thermal runaway associated information of the battery pack and comprises a plurality of detection modules, wherein the detection modules are used for collecting various data of the battery pack, such as temperature, temperature rise rate, voltage and smoke concentration; transmitting the data detected by the thermal runaway detection unit through a data transmission unit, wherein the data transmission unit can be a vehicle body bus; and transmitting the thermal runaway related information to a thermal runaway early warning unit through a bus of the vehicle body, analyzing and processing the thermal runaway related information through the thermal runaway early warning unit, and executing corresponding thermal runaway early warning according to an analysis result.
As shown in fig. 2 and 3, the method for early warning of thermal runaway of the battery pack comprises the following steps:
s1, acquiring thermal runaway associated information of a battery pack;
s2, carrying out data transmission on the thermal runaway associated information so as to enable a whole vehicle control system to acquire the thermal runaway associated information;
and S3, acquiring historical thermal runaway associated information before the transmission failure of the thermal runaway associated information, and carrying out thermal runaway early warning on the battery pack according to the historical thermal runaway associated information when the historical thermal runaway associated information is matched with a preset first early warning threshold.
Through the steps, the acquired thermal runaway associated information is transmitted to a whole vehicle control system; if the acquisition of the thermal runaway associated information by the whole vehicle control system fails, an auxiliary early warning system is intervened, and the whole vehicle control system reads the historical thermal runaway associated information, wherein the thermal runaway associated information before the acquisition of the data of the whole vehicle control system fails is used as the historical thermal runaway associated information; presetting a first early warning threshold, matching the history associated information with the first early warning threshold, and if the history associated information is matched with the first early warning threshold, confirming that a thermal runaway fault exists, and controlling a related module to perform corresponding thermal runaway early warning through a whole vehicle control system; by the method, when the battery pack fails in thermal runaway detection or data transmission fails, thermal runaway early warning can be performed, so that potential safety hazards caused by the loss of control of the battery Bao Re are reduced.
When the battery pack thermal runaway early warning device is used, the historical thermal runaway associated information in a first preset time is obtained, for example, the thermal runaway associated information within 30 seconds before communication failure, and when the historical thermal runaway associated information in the first preset time is matched with a preset first early warning threshold value, the thermal runaway early warning of the battery pack is carried out according to the historical thermal runaway associated information.
In order to improve the reliability of the thermal runaway early warning, the historical thermal runaway correlation information in the first preset time is obtained, and the historical thermal runaway correlation is matched with the first early warning threshold value in the first preset time, for example, when the temperature of the battery pack is too high, the thermal runaway early warning can be triggered, and the abnormal condition that the temperature of the battery pack is too high but the temperature is detected normally possibly occurs at a certain time point, so that the reliability and the safety of the thermal runaway early warning are improved by comparing the historical thermal runaway correlation with the first early warning threshold value in a certain period of time.
The battery management system is used for acquiring thermal runaway related information, wherein the thermal runaway related information comprises the temperature and the voltage of a battery pack, the first early warning threshold comprises a low-voltage early warning value of the battery pack and a high-temperature early warning value of the battery pack, in the thermal runaway detection, the acquired thermal runaway related information is transmitted to a whole vehicle control system through a vehicle body bus, in the process, if the thermal runaway detection fails, data transmission of the thermal runaway detection cannot be communicated normally, after the whole vehicle control system detects that communication is lost, battery pack voltage data and battery pack temperature data in a period of time before the communication is lost are acquired, and when the voltage data of the battery pack is lower than the first early warning threshold and/or the temperature data of the battery pack is higher than the first early warning threshold, the condition that the thermal runaway fails is met, the thermal runaway early warning is triggered, and therefore the reliability of the thermal runaway early warning is improved.
In order to further improve the reliability of the thermal runaway warning, as shown in fig. 4, by way of example, the thermal runaway warning method further includes matching the collected thermal runaway related information with a preset second warning threshold; and when the thermal runaway associated information is matched with the second early warning threshold value and the thermal runaway associated information is successfully transmitted, confirming that the thermal runaway condition of the battery pack is met, and carrying out thermal runaway early warning on the battery pack according to the thermal runaway associated information. For the convenience of understanding, it should be noted that the communication relationship between the thermal runaway detection and the battery management system is also between the battery management system and the vehicle control system.
The second early warning threshold includes an abnormal voltage value, an abnormal temperature, an abnormal smoke concentration outside the battery pack, and the like of the battery pack, as shown in fig. 5, and illustrates that when the thermal runaway detection is in a normal state and the thermal runaway associated information of the battery pack can be normally transmitted to the whole vehicle control system, the detected thermal runaway associated information is matched with the second early warning threshold, the battery management system transmits a matching result to the whole vehicle control system, and if the matching result is successful, the whole vehicle control system performs corresponding thermal runaway early warning by controlling the thermal runaway early warning associated facility, and if the matching result is failed, the battery pack is indicated that the thermal runaway does not occur.
Specifically, the second early warning threshold comprises a plurality of early warning conditions, wherein the first early warning condition is the abnormal temperature of the detection module and the abnormal temperature rise rate of the detection module, and the temperature of the detection module and the temperature rise rate of the detection module for detecting the battery pack are obtained; the second early warning threshold comprises temperature early warning thresholds of a plurality of detection modules and temperature rising rate early warning thresholds of the detection modules; when the temperature of at least two detection modules is matched with the second early warning threshold, the temperature rise rate of the detection modules is matched with the second early warning threshold, and the second preset time is continued, the thermal runaway condition of the battery pack is met.
In the practical use process, after the detection modules for detecting various thermal runaway related signals are used for a long time, the detection modules can generate heat, so that the situation that detected data are inaccurate or lost is caused, therefore, the temperature detection modules are arranged on each detection module, the temperature of the detection modules is also monitored while the battery pack is detected, and when the temperature values of at least two detection modules reach 75 ℃ and the temperature rise rate is higher than 0.5 ℃ per second, the standard of the thermal runaway early warning of the battery pack is reached, and meanwhile, in order to reduce misjudgment caused by the burst property of the data, when the temperature values of the at least two detection modules are matched with the temperature early warning threshold value set by the second early warning threshold value and last more than 5 seconds, the condition of the thermal runaway early warning is met, and the thermal runaway related facilities are controlled by the whole car control system to execute the thermal runaway early warning, so that the accuracy of the thermal runaway early warning is improved.
The second early warning condition is abnormal smoke concentration outside the battery pack, and the smoke concentration outside the battery pack is obtained; the second early warning threshold value comprises a smoke concentration early warning threshold value outside the battery pack; and when the smoke concentration at the outer side of the battery pack is matched with the second early warning threshold value and lasts for a third preset time, the thermal runaway condition of the battery pack is met.
The smoke concentration outside the battery pack is detected through the detection module for detecting smoke, and the method is exemplified by the fact that when the detected smoke concentration value reaches 500 micrograms per cubic meter, the smoke concentration value lasts for more than 3 seconds, namely, the condition of thermal runaway early warning is met, and the thermal runaway early warning is executed through the whole vehicle control system control thermal runaway associated facilities.
The third early warning condition is the combination of abnormal temperature outside the battery pack, abnormal temperature rise rate outside the battery pack and abnormal voltage inside the battery pack, and the temperature outside the battery pack, the temperature rise rate outside the battery pack and the voltage inside the battery pack are obtained; the second early warning threshold comprises a temperature early warning threshold outside the battery pack, a temperature rise rate early warning threshold outside the battery pack and a voltage early warning threshold inside the battery pack; and when the temperature outside the battery pack, the temperature rise rate outside the battery pack and the voltage inside the battery pack are respectively matched with the second early warning threshold value and last for a fourth preset time, the thermal runaway condition of the battery pack is met.
The detection module of the outside temperature of the battery pack and the voltage detection module inside the battery pack are used for detecting the outside temperature of the battery pack, the outside temperature rise rate of the battery pack and the internal voltage, and the detection module is used for exemplarily illustrating that when the detected outside air temperature of the battery pack is greater than 75 ℃, the temperature rise rate of the outside air of the battery pack is greater than 5 ℃ per second, and simultaneously, when the detected inside voltage of the battery pack is lower than 1 volt and lasts for more than 3 seconds, namely, the conditions of thermal runaway early warning are met, and the thermal runaway associated facilities are controlled by the whole vehicle control system to execute the thermal runaway early warning.
The fourth early warning condition is the combination of the abnormal temperature inside the battery pack, the abnormal temperature rise rate inside the battery pack and the abnormal voltage inside the battery pack, and the temperature inside the battery pack, the temperature rise rate inside the battery pack and the voltage inside the battery pack are obtained; the second early warning threshold comprises a temperature early warning threshold inside the battery pack, a temperature rise rate early warning threshold inside the battery pack and a voltage early warning threshold inside the battery pack; and when the temperature inside the battery pack, the temperature rise rate inside the battery pack and the voltage inside the battery pack are respectively matched with the second early warning threshold value and last for a fourth preset time, the thermal runaway condition of the battery pack is met.
The detection module of the internal temperature of the battery pack and the voltage detection module of the internal temperature of the battery pack detect the internal temperature, the internal temperature rise rate and the internal voltage of the battery pack, and the detection module is used for exemplarily illustrating that when the detected internal temperature of the battery pack is greater than 65 ℃, the internal temperature rise rate of the battery pack is greater than 1 ℃ per second, and simultaneously, the detected internal voltage of the battery pack is lower than 1 volt and lasts for more than 5 seconds, namely, the condition of thermal runaway early warning is met, and the thermal runaway associated facilities are controlled by the whole vehicle control system to execute the thermal runaway early warning.
Through the arrangement of the plurality of thermal runaway early-warning devices, in the process of detecting the thermal runaway of the battery pack, the thermal runaway early-warning device can trigger the thermal runaway early-warning device as long as one early-warning condition is met, so that the accuracy of the thermal runaway early-warning device is improved, and the probability of missing report of the thermal runaway detection of the battery pack is reduced; meanwhile, the temperature of the detection module body is detected, the early warning condition is set, and when the detection module fails or detects abnormal conditions, the early warning can be carried out through the thermal runaway early warning unit, so that the maintenance of the thermal runaway early warning unit by workers is facilitated, and the safety and the maintenance convenience of the battery pack thermal runaway early warning system are improved.
In order to further improve the use safety of the battery pack thermal runaway warning system, as shown in fig. 6, the power-up step before the use of the battery pack includes:
s01, presetting a normal voltage threshold of the battery pack, and detecting abnormality of the battery pack before the battery pack is electrified;
s02, acquiring a power-down request of the battery pack according to the abnormal data of the battery pack, and carrying out data transmission on the power-down request so as to enable the whole vehicle control system to acquire the power-down request;
and S03, when the whole vehicle control system acquires the power-down request, controlling the battery pack to power down through the whole vehicle control system.
Through the step of electrifying the battery pack, before electrifying the battery pack, the battery pack is subjected to self-checking, specifically, the voltage of the battery pack is detected before the battery pack is electrified at high voltage, the detection result is transmitted to a battery management system, when the voltage of the battery pack is in a normal state, the battery pack is electrified, and when the voltage of the battery pack is in an abnormal state, the battery management system transmits voltage abnormality information of the battery pack to a whole vehicle control system, and the whole vehicle control system controls the battery pack to be electrified; if the battery pack is abnormal, the probability of faults of the battery pack is reduced in a self-checking mode of the battery pack, so that the use safety of the battery pack heat loss early warning system is improved.
The thermal runaway early warning unit comprises a vehicle body controller, a combination instrument and a vehicle network terminal, wherein the vehicle body controller is electrically connected with a door lock switch of a vehicle door, the vehicle body controller is also electrically connected with an alarm lamp arranged in the vehicle, and the vehicle network terminal is in communication connection with mobile equipment, such as a mobile phone terminal; each thermal runaway early warning unit is in communication connection with a bus of the vehicle body, and a whole vehicle controller in the whole vehicle control system is also in communication connection with the bus of the vehicle body. By way of example, when the battery pack is out of control, the vehicle body controller transmits a data signal of the thermal runaway warning to the vehicle body controller, the vehicle body controller controls the alarm lamp to be opened, and the vehicle body controls the door lock of the vehicle door to be opened, so that passengers can acquire information of the out of control of the battery Bao Re in time and can leave from the vehicle in time; meanwhile, the thermal runaway early warning information is sent to the mobile device through the vehicle-mounted network terminal, and passengers in the vehicle are further prompted through the mobile device, so that the use safety of the thermal runaway early warning system is improved.
In order to more clearly show the specific content of the present invention, as shown in fig. 8, the battery pack thermal runaway warning system and method of the present invention mainly comprises the following contents:
after the battery pack is electrified at high voltage, the battery pack is detected in real time through a thermal runaway detection unit, the detected thermal runaway associated information is transmitted to a battery management system, the battery management system matches the thermal runaway associated information with a second early warning threshold value, and the thermal runaway associated information and a matching result are transmitted to a whole vehicle control system through a vehicle body bus; when the communication between the battery control system and the whole vehicle control system is normal, the whole vehicle control system executes corresponding thermal runaway early warning control according to the matching result of the thermal runaway associated information and the second early warning threshold value; when the communication between the battery control system and the whole vehicle control system is abnormal, the whole vehicle control system matches the historical thermal runaway associated information with a first early warning threshold value, and executes corresponding thermal runaway early warning control according to a matching result of the historical thermal runaway associated information and the first early warning threshold value; the following objects are achieved in this way: in a normal state of thermal runaway detection of the battery pack, the whole vehicle control system controls the starting of related facilities of the thermal runaway early warning according to the acquired thermal runaway related information; and in the abnormal or even invalid state of thermal runaway detection, judging whether the battery pack is in thermal runaway or not through reading the historical thermal runaway associated data, if so, controlling the associated facilities of the thermal runaway early warning to be started, and if not, indicating that the battery pack is not in thermal runaway. Through the judgment of the multiple early warning conditions, the use safety and reliability of the thermal runaway early warning system are improved.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (9)
1. The battery pack thermal runaway early warning method is characterized by comprising the following steps of:
collecting thermal runaway related information of a battery pack;
carrying out data transmission on the thermal runaway associated information so as to enable a whole vehicle control system to acquire the thermal runaway associated information;
matching the acquired thermal runaway associated information with a preset second early warning threshold;
when the thermal runaway associated information is matched with the second early warning threshold and the thermal runaway associated information is successfully transmitted, confirming that the condition of the battery Bao Re for runaway is met, and carrying out thermal runaway early warning on the battery pack according to the thermal runaway associated information;
and acquiring historical thermal runaway associated information before the transmission failure of the thermal runaway associated information, and carrying out thermal runaway early warning on the battery pack according to the historical thermal runaway associated information when the historical thermal runaway associated information is matched with a preset first early warning threshold.
2. The method of claim 1, wherein the historical thermal runaway associated information is obtained for a first predetermined time, and the thermal runaway of the battery pack is pre-warned according to the historical thermal runaway associated information when the historical thermal runaway associated information for the first predetermined time matches a predetermined first pre-warning threshold.
3. The battery Bao Re runaway warning method of claim 2, wherein the historical thermal runaway related information includes a temperature of the battery pack and a voltage of the battery pack;
the first early warning threshold value comprises a temperature early warning threshold value of the battery pack and a voltage early warning threshold value of the battery pack;
and determining that a thermal runaway early warning fault occurs when the temperature of the battery pack is higher than a first early warning threshold value and/or the voltage of the battery pack is lower than the first early warning threshold value.
4. The method for warning of runaway of a battery Bao Re of claim 1, wherein a plurality of detection module temperatures for detection of the battery pack are obtained, and a rate of temperature rise of the detection module is determined;
the second early warning threshold comprises temperature early warning thresholds of a plurality of detection modules and temperature rising rate early warning thresholds of the detection modules;
when the temperatures of at least two detection modules are matched with the second early warning threshold, and the temperature rise rate of the detection modules is matched with the second early warning threshold, and the second preset time is continued, the out-of-control condition of the battery Bao Re is satisfied.
5. The method of claim 1, wherein the smoke concentration outside the battery pack is obtained;
the second early warning threshold value comprises a smoke concentration early warning threshold value outside the battery pack;
and when the smoke concentration at the outer side of the battery pack is matched with the second early warning threshold value and lasts for a third preset time, the condition that the battery Bao Re is out of control is met.
6. The method for warning of runaway of a battery Bao Re of claim 1, wherein a temperature outside the battery pack, a rate of temperature rise outside the battery pack, and a voltage inside the battery pack are obtained;
the second early warning threshold comprises a temperature early warning threshold outside the battery pack, a temperature rise rate early warning threshold outside the battery pack and a voltage early warning threshold inside the battery pack;
when the temperature outside the battery pack, the temperature rise rate outside the battery pack and the voltage inside the battery pack are respectively matched with the second early warning threshold value and last for a fourth preset time, the condition that the battery Bao Re is out of control is satisfied.
7. The method for warning of runaway of battery Bao Re of claim 1, wherein the temperature inside the battery pack, the rate of temperature rise inside the battery pack, and the voltage inside the battery pack are obtained;
the second early warning threshold comprises a temperature early warning threshold inside the battery pack, a temperature rise rate early warning threshold inside the battery pack and a voltage early warning threshold inside the battery pack;
when the temperature inside the battery pack, the temperature rise rate inside the battery pack and the voltage inside the battery pack are respectively matched with the second early warning threshold value and last for a fifth preset time, the condition that the battery Bao Re is out of control is satisfied.
8. The method of claim 1, wherein the step of powering up the battery pack before use comprises:
presetting a normal voltage threshold of the battery pack, and detecting abnormality of the battery pack before the battery pack is electrified;
acquiring a power-down request of the battery pack according to the abnormal data of the battery pack, and carrying out data transmission on the power-down request so as to enable the whole vehicle control system to acquire the power-down request;
when the whole vehicle control system acquires the power-down request, the whole vehicle control system controls the battery pack to power down.
9. A battery pack thermal runaway warning system, comprising:
a thermal runaway detection unit for acquiring thermal runaway associated information;
the data transmission unit is used for data transmission of the thermal runaway associated information and is electrically connected with the thermal runaway detection unit;
the thermal runaway early warning unit, thermal runaway early warning unit with data transmission unit electric connection carries out the thermal runaway early warning of battery package according to thermal runaway associated information, includes:
matching the acquired thermal runaway associated information with a preset second early warning threshold;
when the thermal runaway associated information is matched with the second early warning threshold and the thermal runaway associated information is successfully transmitted, confirming that the condition of the battery Bao Re for runaway is met, and carrying out thermal runaway early warning on the battery pack according to the thermal runaway associated information;
and acquiring historical thermal runaway associated information before the transmission failure of the thermal runaway associated information, and carrying out thermal runaway early warning on the battery pack according to the historical thermal runaway associated information when the historical thermal runaway associated information is matched with a preset first early warning threshold.
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