CN115411388A - Early warning method, device and equipment for thermal runaway of vehicle battery based on inspection wakeup and storage medium - Google Patents

Early warning method, device and equipment for thermal runaway of vehicle battery based on inspection wakeup and storage medium Download PDF

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Publication number
CN115411388A
CN115411388A CN202211216196.9A CN202211216196A CN115411388A CN 115411388 A CN115411388 A CN 115411388A CN 202211216196 A CN202211216196 A CN 202211216196A CN 115411388 A CN115411388 A CN 115411388A
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battery
data
thermal runaway
value
voltage
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陈建行
朱骞
喻成
杨旭
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Chongqing Changan New Energy Automobile Technology Co Ltd
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Chongqing Changan New Energy Automobile Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to a method, a device, equipment and a storage medium for early warning of thermal runaway of a vehicle battery based on polling awakening, wherein battery comprehensive data and a battery state threshold of a vehicle power battery in a current polling period are acquired; comparing the value of the battery comprehensive data with a battery state threshold value to obtain a comparison result; inputting the battery comprehensive data into a preset risk identification model according to the comparison result to obtain a risk identification result; carrying out thermal runaway fault judgment on the vehicle power battery according to the risk identification result and the battery comprehensive data to obtain a fault judgment result; and when the fault judgment result indicates that the thermal runaway fault exists in the vehicle power battery, executing thermal runaway early warning. According to the invention, the battery comprehensive data of the vehicle power battery is obtained, the basic state of the vehicle power battery is judged through one-time simple data comparison, and early warning is carried out based on the fault judgment result, so that the problem that the warning can only be carried out after the thermal runaway event occurs in the prior art is solved.

Description

Early warning method, device, equipment and storage medium for thermal runaway of vehicle battery based on patrol and awakening
Technical Field
The invention relates to the technical field of automobile battery detection, in particular to a method, a device, equipment and a storage medium for early warning of thermal runaway of a vehicle battery based on inspection wakeup.
Background
With the gradual deterioration of global climate, the aggravation of urban atmospheric pollution and the excessive consumption of petroleum resources, more and more people in the automobile field have looked to electric automobiles. The power battery is an important component of the electric automobile, and the safety of the power battery is very important to the safety of users and the experience of the users.
The current power battery safety problem occurs on the market occasionally. At present, most of battery assembly safety schemes are all provided with all-weather monitoring schemes of adding an air pressure sensor, the air pressure inside a battery pack can be monitored for 24 hours, and a BMS (battery management system) can be awakened to alarm after a thermal runaway event occurs. However, the scheme can only realize the alarm after the thermal runaway occurs, and cannot meet the requirement of early warning the occurrence of the thermal event.
Disclosure of Invention
One of the objectives of the present invention is to provide a method, an apparatus, a device and a storage medium for early warning of thermal runaway of a vehicle battery based on polling wakeup, so as to solve the problem that in the prior art, an alarm can only be given after a thermal runaway event occurs.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a vehicle battery thermal runaway early warning method based on patrol and awakening comprises the following steps:
the present invention also provides an electronic device comprising:
acquiring battery comprehensive data and a battery state threshold of a vehicle power battery in a current inspection period;
comparing the value of the battery comprehensive data with the battery state threshold value to obtain a comparison result;
inputting the battery comprehensive data into a preset risk identification model according to the comparison result to obtain a risk identification result;
according to the risk identification result, the battery comprehensive data is combined to carry out thermal runaway fault judgment on the vehicle power battery, and a fault judgment result is obtained;
and when the fault judgment result indicates that the thermal runaway fault exists in the vehicle power battery, executing thermal runaway early warning.
In an embodiment of the present invention, if the battery state threshold includes an under-voltage threshold, an over-voltage threshold, and a temperature threshold; then, acquiring a battery state threshold value of the current polling period, including:
acquiring a voltage sampling value CellU1 and a temperature sampling value T1 of the vehicle power battery in the previous polling period, and acquiring a first voltage characteristic value delta U1, a second voltage characteristic value delta U2 and a temperature characteristic value delta T1 of the vehicle power battery; the first voltage characteristic value delta U1, the second voltage characteristic value delta U2 and the temperature characteristic value delta T1 are set according to the battery core characteristics of the power battery;
setting an undervoltage threshold according to the voltage sampling value CellU1 and the first voltage characteristic value Δ U1, where the undervoltage threshold = CellU1- Δ U1; setting an overvoltage threshold according to the voltage sampling value CellU1 and the second voltage characteristic value Δ U2, wherein the overvoltage threshold = CellU1+ Δ U2; and setting a temperature threshold value according to the temperature sampling value T1 and the temperature characteristic value delta T1, wherein the temperature threshold value = T1+ delta T1.
In an embodiment of the present invention, if the battery integration data includes voltage data; comparing the value of the battery comprehensive data with the battery state threshold value to obtain a comparison result, wherein the comparison result comprises the following steps:
comparing a value of the voltage data to the under-voltage threshold and the over-voltage threshold;
when the value of the voltage data is between the undervoltage threshold and the overvoltage threshold, the value of the voltage data is normal; and when the value of the voltage data is smaller than the undervoltage threshold value and/or the value of the voltage data is larger than the overvoltage threshold value, the value of the voltage data is abnormal.
In an embodiment of the present invention, if the battery comprehensive data further includes temperature data; comparing the value of the battery comprehensive data with the battery state threshold value to obtain a comparison result, and further comprising:
comparing the value of the temperature data to the temperature threshold;
when the value of the temperature data is smaller than the temperature threshold value, the value of the temperature data is normal; when the value of the temperature data is greater than or equal to the temperature threshold value, the value of the temperature data is abnormal.
In an embodiment of the present invention, if the battery comprehensive data further includes current data and air pressure data; carrying out thermal runaway risk identification on the vehicle power battery according to the comparison result and by combining the battery comprehensive data to obtain a risk identification result; the method comprises the following steps:
when the voltage data and the temperature data are abnormal, inputting the voltage data, the temperature data, the current data and the air pressure data into a preset risk identification model to obtain an identification result; the risk identification model comprises a corresponding relation between voltage data and an identification result, a corresponding relation between temperature data and an identification result, a corresponding relation between current data and an identification result, and a corresponding relation between air pressure data and an identification result.
In an embodiment of the present invention, performing a thermal runaway fault judgment on a vehicle power battery according to the risk identification result and the battery comprehensive data to obtain a fault judgment result, including:
when the risk identification result of the vehicle power battery has a thermal runaway risk and simultaneously meets the target condition, judging that the vehicle power battery has a thermal runaway fault; otherwise, judging that the thermal runaway fault does not exist in the vehicle power battery, and ending the current inspection cycle when the duration time of the thermal runaway fault does not exist in the vehicle power battery exceeds a preset time threshold;
when the battery comprehensive data further includes voltage difference data, voltage drop data, insulation state data, and voltage rise data, the target conditions include:
the voltage difference data are larger than a preset voltage difference threshold value, the voltage drop data are larger than a preset voltage drop threshold value, the insulation state data comprise insulation faults, and the voltage rise data are larger than a preset voltage transformation change threshold value.
In an embodiment of the present invention, performing a thermal runaway warning includes:
and sending the pre-generated alarm information to a preset object to execute thermal runaway early warning.
The invention also provides a vehicle battery thermal runaway early warning device based on patrol and awakening, which comprises:
the acquisition module is used for acquiring battery comprehensive data and a battery state threshold of the vehicle power battery in the current inspection period;
the comparison module is used for comparing the value of the battery comprehensive data with the battery state threshold value to obtain a comparison result;
the identification module is used for inputting the battery comprehensive data into a preset risk identification model according to the comparison result to obtain a risk identification result;
the judging module is used for carrying out thermal runaway fault judgment on the vehicle power battery according to the risk identification result and the battery comprehensive data to obtain a fault judgment result;
and the early warning module is used for executing thermal runaway early warning when the fault judgment result indicates that the thermal runaway fault exists in the vehicle power battery.
The present invention also provides an electronic device comprising:
one or more processors;
and the storage device is used for storing one or more programs, and when the one or more programs are executed by the one or more processors, the electronic equipment realizes the inspection wake-based vehicle battery thermal runaway early warning method.
The present invention also provides a computer-readable storage medium having stored thereon computer-readable instructions, which, when executed by a processor of a computer, cause the computer to execute the patrol wake-based vehicle battery thermal runaway early warning method as described above.
The invention has the beneficial effects that: the invention relates to a vehicle battery thermal runaway early warning method based on patrol and awakening, which comprises the steps of obtaining battery comprehensive data and a battery state threshold of a vehicle power battery in a current patrol period; comparing the value of the battery comprehensive data with a battery state threshold value to obtain a comparison result; inputting the battery comprehensive data into a preset risk identification model according to the comparison result to obtain a risk identification result; carrying out thermal runaway fault judgment on the vehicle power battery according to the risk identification result and the battery comprehensive data to obtain a fault judgment result; and when the fault judgment result indicates that the thermal runaway fault exists in the vehicle power battery, executing thermal runaway early warning. According to the invention, the battery comprehensive data of the vehicle power battery is obtained, the basic state of the vehicle power battery is judged through one-time simple data comparison, then the battery comprehensive data is identified and judged according to the comparison result, and early warning is carried out based on the fault judgment result, so that the problem that the warning can be carried out only after the thermal runaway event occurs in the prior art is solved.
Drawings
Fig. 1 is an application scenario diagram of a vehicle battery thermal runaway early warning method based on patrol and wakeup according to an exemplary embodiment of the present application;
FIG. 2 is a flow chart illustrating a method for early warning of thermal runaway of a vehicle battery based on wake-up-on-patrol in accordance with an exemplary embodiment of the present application;
FIG. 3 is a diagram illustrating an implementation process of a vehicle battery thermal runaway warning method based on patrol wake-up according to another exemplary embodiment of the present application;
fig. 4 is a block diagram illustrating a vehicle battery thermal runaway warning device based on patrol wakeup according to an exemplary embodiment of the present application;
FIG. 5 illustrates a schematic structural diagram of a computer system suitable for use to implement the electronic device of the embodiments of the subject application.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure herein, wherein the embodiments of the present invention are described in detail with reference to the accompanying drawings and preferred embodiments. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Fig. 1 is a view of an application scenario of a vehicle Battery thermal runaway warning method based on polling wakeup according to an exemplary embodiment of the application, and as shown in fig. 1, a BMS (Battery Management System) board inside a vehicle collects relevant data of a vehicle power Battery, the BMS board includes a BMS motherboard and a BMS board, the BMS board is capable of polling Battery voltage and temperature regularly and comparing the Battery voltage and temperature with a preset voltage threshold and a preset temperature threshold, and when the Battery voltage exceeds the voltage threshold, the Battery temperature exceeds the temperature threshold or the Battery voltage is lower than the voltage threshold, it is determined that the vehicle power Battery is abnormal. When vehicle power battery is unusual, the BMS mainboard is awaken up to the BMS branch board, the BMS mainboard is with vehicle power battery's other comprehensive data, including current data, atmospheric pressure data, pressure difference data, pressure drop data, the insulating state data, upload to the big data platform at high in the clouds such as voltage rising data, big data platform synthesizes data according to the battery and carries out thermal runaway risk identification and thermal runaway trouble judgement to vehicle power battery, if it has the thermal runaway risk to obtain vehicle power battery, during the structure of thermal runaway trouble, big data platform sends thermal runaway risk identification result and thermal runaway trouble judgement result to relevant staff's intelligent terminal, realize the early warning.
The smart terminal 110 shown in fig. 1 is a device such as a mobile phone, a tablet, a wearable device, and the like, which supports receiving an early warning message, and the big data server platform 120 is a server, which may be, for example, an independent physical server, a server cluster or a distributed system formed by a plurality of physical servers, or a cloud server providing basic cloud computing services such as cloud service, a cloud database, cloud computing, cloud functions, cloud storage, network service, cloud communication, middleware service, domain name service, security service, CDN (Content Delivery Network), and a big data and artificial intelligence platform, which are not limited herein. The intelligent terminal 110 may communicate with the big data platform 120 through a wireless network such as 3G (third generation mobile information technology), 4G (fourth generation mobile information technology), 5G (fifth generation mobile information technology), etc., which is not limited herein.
As shown in fig. 2, in an exemplary embodiment, the method for warning a thermal runaway of a vehicle battery based on patrol wakeup at least includes steps S210 to S240, which are described in detail as follows:
s210, acquiring battery comprehensive data and a battery state threshold of the vehicle power battery in the current inspection cycle;
in this embodiment, BMS divides the board to patrol and examine vehicle power battery's battery integration data regularly, consequently will patrol and examine the process and divide into a plurality of periods of patrolling and examining.
S220, comparing the value of the battery comprehensive data with the battery state threshold value to obtain a comparison result;
in this embodiment, the comparison result includes that the battery is normal and the battery is abnormal, such as that the cell voltage is too low (lower than the cell voltage threshold), the cell voltage is too high (higher than the cell voltage threshold), the cell temperature is too high, and the like (higher than the cell temperature threshold), which all belong to the abnormal operation condition of the battery.
S230, inputting the battery comprehensive data into a pre-established thermal runaway risk identification model according to the comparison result to obtain a risk identification result;
when the vehicle power battery is in an abnormal working condition, the BMS mainboard awakens the vehicle control unit, and the data uploading request flag position of the vehicle control unit is 1 (enabled), so that the battery comprehensive data is uploaded to the big data platform, and the big data platform identifies the battery comprehensive data by using the thermal runaway risk identification model, so that whether the vehicle power battery in the current period (or the current time) has the thermal runaway risk is identified.
S240, carrying out thermal runaway fault judgment on the vehicle power battery according to the risk identification result and the battery comprehensive data to obtain a fault judgment result;
in step S230, when the vehicle power battery has a risk of thermal runaway, the big data platform determines, by using the condition, whether the vehicle power battery in the current cycle (or the current time) has a thermal runaway fault. And when the thermal runaway risk flag bit in the BMS board lasts for n minutes and the thermal runaway fault of the vehicle power battery is judged to be absent, the current routing inspection period is ended, and the whole vehicle controller sends a dormancy instruction to the BMS board.
And S250, when the fault judgment result shows that the thermal runaway fault exists in the vehicle power battery, executing thermal runaway early warning.
In step S240, the risk identification result includes a high or low which may be a risk degree; the fault judgment result comprises two conditions of existence of thermal runaway fault and nonexistence of thermal runaway fault; therefore, in the embodiment, when an out-of-control fault exists, the risk identification result and the fault judgment result are sent, and early warning is achieved.
In an embodiment of the present invention, the battery state threshold includes an under-voltage threshold, an over-voltage threshold, and a temperature threshold;
the process of obtaining the battery state threshold of the current patrol period may include steps S310 to S320, which are described in detail as follows:
s310, acquiring a voltage sampling value CellU1 and a temperature sampling value T1 of the vehicle power battery in the previous inspection cycle, and acquiring a first voltage characteristic value delta U1, a second voltage characteristic value delta U2 and a temperature characteristic value delta T1 of the vehicle power battery; the first voltage characteristic value delta U1, the second voltage characteristic value delta U2 and the temperature characteristic value delta T1 are set according to the battery core characteristics of the power battery;
after each patrol and examine the cycle, vehicle control unit can send dormancy instruction to the BMS board to make the BMS board get into the dormancy, need dispose before the BMS board gets into the dormancy and patrol and examine mode and battery state threshold value, in this embodiment, patrol and examine the mode and all dispose the cycle and patrol and examine the model. Therefore, the battery state threshold needs to be configured. The undervoltage threshold, the overvoltage threshold and the temperature threshold of the vehicle power battery in the current inspection period need to be set according to the voltage sampling value and the temperature sampling value of the vehicle power battery in the previous inspection period, so that the voltage sampling value and the temperature sampling value of the vehicle power battery in the previous inspection period need to be collected at first. The first voltage characteristic value Δ U1, the second voltage characteristic value Δ U2, and the temperature characteristic value Δ T1 are set according to the discharge characteristics of the vehicle-mounted power battery.
S320, setting an undervoltage threshold according to the voltage sampling value CellU1 and the first voltage characteristic value Δ U1, where the undervoltage threshold = CellU1- Δ U1; setting an overvoltage threshold according to the voltage sampling value CellU1 and the second voltage characteristic value Δ U2, wherein the overvoltage threshold = CellU1+ Δ U2; and setting a temperature threshold value according to the temperature sampling value T1 and the temperature characteristic value delta T1, wherein the temperature threshold value = T1+ delta T1.
The first voltage characteristic value delta U1, the second voltage characteristic value delta U2 and the temperature characteristic value delta T1 are preset in an inspection threshold value table, and after a BMS board acquires a voltage sampling value CellU1 and a temperature sampling value T1 through a certain acquisition channel, the BMS board directly configures an undervoltage threshold value, an overvoltage threshold value and a temperature threshold value through inquiring the inspection threshold value table. The vehicle power battery in this embodiment may be a single battery or a plurality of batteries.
In an embodiment of the present invention, if the battery integration data includes voltage data; comparing the value of the battery comprehensive data with the battery state threshold value to obtain a comparison result may include steps S410 to S420, which are described in detail as follows:
s410, comparing the value of the voltage data with the undervoltage threshold value and the overvoltage threshold value;
s420, when the value of the voltage data is between the undervoltage threshold value and the overvoltage threshold value, the value of the voltage data is normal; and when the value of the voltage data is smaller than the undervoltage threshold value and/or the value of the voltage data is larger than the overvoltage threshold value, the value of the voltage data is abnormal.
In the embodiment, a range of a normal voltage value is established through an undervoltage threshold and an overvoltage threshold, and when the voltage data value of the vehicle power battery in the current inspection period is in the range, the vehicle power battery in the current inspection period is judged to be normal; otherwise, judging the abnormality of the vehicle power battery in the current inspection cycle.
In one embodiment of the present invention, if the battery integration data further includes temperature data; comparing the value of the battery comprehensive data with the battery state threshold value, and obtaining the comparison result may further include steps S510 to S520, which are described in detail as follows:
s510, comparing the value of the temperature data with the temperature threshold value;
s520, when the value of the temperature data is smaller than the temperature threshold value, the value of the temperature data is normal; when the value of the temperature data is greater than or equal to the temperature threshold value, the value of the temperature data is abnormal.
In the embodiment, a range of a normal temperature value is established through a temperature threshold, and when the temperature data value of the vehicle power battery in the current inspection period is smaller than the temperature threshold, the vehicle power battery in the current inspection period is judged to be normal; otherwise, judging the abnormality of the vehicle power battery in the current inspection cycle.
In an embodiment of the present invention, if the battery comprehensive data further includes current data and air pressure data; then, the battery comprehensive data is input into a pre-established risk identification model according to the comparison result, and the process of obtaining the risk identification result may include step S610, which is described in detail as follows:
s610, when the voltage data value is abnormal and the temperature data value is abnormal, inputting the voltage data, the temperature data, the current data and the air pressure data into a preset risk identification model to obtain an identification result; the risk identification model comprises corresponding relations between voltage data, temperature data, current data, air pressure data and identification results.
In this embodiment, the big data platform analyzes whether a thermal runaway risk exists by applying a thermal runaway early warning algorithm according to the voltage data, the temperature data, the current data and the air pressure data of the current inspection cycle. The big data early warning algorithm is used for identifying battery parameters by a battery electrochemical model-based method according to data in a battery big data platform and identifying the safety condition, the dangerous condition or the dangerous state of the battery. The big data platform can also find out the rule of data change based on massive battery data by a data driving method, such as identifying the current, voltage, temperature, internal air pressure value of the battery pack and the like of the battery to find out special points and abnormal points of the battery change, and diagnosing and predicting the battery state. Specifically, the thermal runaway early warning algorithm is to input voltage data, temperature data, current data and air pressure data of the current inspection cycle into a pre-established risk identification model for identification result query. The risk identification model comprises the numerical distribution conditions of voltage data, temperature data, current data and air pressure data under various conditions (including the conditions of thermal runaway risk and thermal runaway risk), so that corresponding identification results can be obtained by matching the voltage data, the temperature data, the current data and the air pressure data of the current inspection cycle with the voltage data, the temperature data, the current data and the air pressure data in the risk identification model, and whether the thermal runaway risk exists in the vehicle power battery of the current inspection cycle is judged.
Specifically, the air pressure data is collected by an air pressure sensor preset in the vehicle power battery assembly.
In an embodiment of the present invention, the process of performing the thermal runaway fault judgment on the vehicle power battery according to the risk identification result and the battery comprehensive data to obtain the fault judgment result may include step S710, which is described in detail as follows:
s710, when the fault judgment result of the vehicle power battery has a thermal runaway risk and simultaneously meets the target condition, judging that the vehicle power battery has a thermal runaway fault; otherwise, judging that the thermal runaway fault does not exist in the vehicle power battery, and ending the current inspection cycle when the duration time of the thermal runaway fault does not exist in the vehicle power battery exceeds a preset time threshold;
when the battery comprehensive data further comprises voltage difference data, voltage drop data, insulation state data and voltage rise data; the target conditions include:
the voltage difference data are larger than a preset voltage difference threshold value, the voltage drop data are larger than a preset voltage drop threshold value, the insulation state data comprise insulation faults, and the voltage rise data are larger than a preset voltage transformation change threshold value.
Common diagnostic methods of thermal runaway include: UT (cell voltage, cell temperature) diagnostic scheme, UTP (cell voltage, cell temperature, barometric sensor pressure value) diagnostic scheme, UTs (cell voltage, cell temperature, switch explosion-proof valve status) diagnostic scheme, UTP (cell voltage, cell temperature, smoke sensor pressure value) diagnostic scheme; in the embodiment, a UT (cell voltage, cell temperature) diagnosis scheme is adopted, and a thermal runaway fault is reported when combination conditions of temperature rise exceeding a threshold value, overlarge voltage drop, large voltage difference, insulation fault, voltage acquisition fault or voltage acquisition electrical fault, voltage rationality fault and the like are met within a certain time.
If the fault judgment result shows that the thermal runaway fault does not exist in the vehicle power battery, the thermal runaway fault mark position 0 of the BMS mainboard and the time of the thermal runaway fault mark position 0 of the BMS mainboard exceeds a time threshold (such as n minutes), the current inspection cycle is ended, and the whole vehicle controller sends a sleep signal to enable the BMS board to sleep.
In an embodiment of the present invention, the process of performing the warning of the thermal runaway based on the fault determination result may include step S810, which is described in detail as follows:
and S810, when the thermal runaway fault exists in the vehicle power battery, sending pre-generated alarm information to a preset object to execute thermal runaway early warning.
In this embodiment, when the vehicle power battery has a thermal runaway fault, the thermal runaway fault flag in the BMS board is set to 1 (true), and then the thermal runaway fault processing is performed, for example, information is sent to a user to prompt maintenance, enterprise recall, and the like.
In another embodiment of the present application, a complete implementation process of the early warning method for thermal runaway of vehicle battery based on wake-up-by-inspection is shown in fig. 3,
(1) Starting the polling process after the clock signal in the BMS sub-board is the current polling period, and acquiring the battery comprehensive data of the vehicle power battery, including temperature data and voltage data; awakening the BMS mainboard when the temperature data and the voltage data are abnormal; when the temperature data and the voltage data are normal, the BMS mainboard is not awakened;
(2) The BMS main board judges whether the BMS main board receives the wake-up signal from the BMS sub-board, if so, the BMS main board wakes up the whole vehicle controller, if not, the BMS main board returns to the judging process, and whether the BMS main board receives the wake-up signal from the BMS sub-board is judged continuously;
(3) When the BMS mainboard is awakened, the data uploading request of the vehicle control unit is marked at the position 1, the battery comprehensive data uploading is started to be transferred to the big data translation, and meanwhile, the timing is started;
(4) The big data platform identifies the battery comprehensive data, when the fact that the thermal runaway risk exists in the vehicle power battery is identified, but the big data platform does not judge that the thermal runaway fault exists in the vehicle battery in the timing period (n min), the big data platform uploads the data of the vehicle control unit to a mark position 0, the uploading of the data is stopped, and the vehicle control unit sends a sleep instruction to the BMS board; when the thermal runaway risk exists in the power battery of the vehicle and the thermal runaway fault exists in the battery of the vehicle, the large data platform enters a thermal runaway fault processing stage and sends early warning information at the same time;
(5) And (3) carrying out voltage sampling and temperature sampling on the vehicle power battery before the BMS board is in dormancy to obtain a voltage threshold value and a temperature threshold value of the next polling period, then entering dormancy, and finishing battery polling of the current period.
The invention discloses a vehicle battery thermal runaway early warning method based on patrol and awakening, which comprises the steps of obtaining battery comprehensive data and a battery state threshold of a vehicle power battery in a current patrol period; comparing the value of the battery comprehensive data with a battery state threshold value to obtain a comparison result; inputting the battery comprehensive data into a preset risk identification model according to the comparison result to obtain a risk identification result; performing thermal runaway fault judgment on the vehicle power battery according to the risk identification result and the battery comprehensive data to obtain a fault judgment result; and when the fault judgment result indicates that the thermal runaway fault exists in the vehicle power battery, executing thermal runaway early warning. According to the invention, the battery comprehensive data of the vehicle power battery is obtained, the basic state of the vehicle power battery is judged through one-time simple data comparison, then the battery comprehensive data is identified and judged according to the comparison result, and early warning is carried out based on the fault judgment result, so that the problem that warning can only be carried out after a thermal runaway event occurs in the prior art is solved.
As shown in fig. 4, the present invention further provides a vehicle battery thermal runaway early warning device based on patrol and wakeup, the device includes:
the system comprises an acquisition module, a storage module and a processing module, wherein the acquisition module is used for acquiring battery comprehensive data and a battery state threshold of a vehicle power battery in a current inspection cycle;
the comparison module is used for comparing the value of the battery comprehensive data with the battery state threshold value to obtain a comparison result;
the identification module is used for inputting the battery comprehensive data into a preset risk identification model according to the comparison result to obtain a risk identification result;
the judgment module is used for carrying out thermal runaway fault judgment on the vehicle power battery according to the risk identification result and the battery comprehensive data to obtain a fault judgment result;
and the early warning module is used for executing thermal runaway early warning when the fault judgment result indicates that the thermal runaway fault exists in the vehicle power battery.
The invention relates to a vehicle battery thermal runaway early warning device based on patrol awakening, which acquires battery comprehensive data and a battery state threshold of a vehicle power battery in a current patrol period; comparing the value of the battery comprehensive data with a battery state threshold value to obtain a comparison result; inputting the battery comprehensive data into a preset risk identification model according to the comparison result to obtain a risk identification result; carrying out thermal runaway fault judgment on the vehicle power battery according to the risk identification result and the battery comprehensive data to obtain a fault judgment result; and when the fault judgment result indicates that the thermal runaway fault exists in the vehicle power battery, executing thermal runaway early warning. According to the invention, the battery comprehensive data of the vehicle power battery is obtained, the basic state of the vehicle power battery is judged through one-time simple data comparison, then the battery comprehensive data is identified and judged according to the comparison result, and early warning is carried out based on the fault judgment result, so that the problem that the warning can be carried out only after the thermal runaway event occurs in the prior art is solved.
It should be noted that the inspection wake-up based vehicle battery thermal runaway early warning device provided in the foregoing embodiment and the inspection wake-up based vehicle battery thermal runaway early warning method provided in the foregoing embodiment belong to the same concept, and specific ways in which the modules and units execute operations have been described in detail in the method embodiment, and are not described herein again. In practical application, the patrol and awakening-based vehicle battery thermal runaway early warning device provided by the embodiment can distribute the functions through different functional modules according to needs, namely, the internal structure of the device is divided into different functional modules so as to complete all or part of the functions described above, and the patrol and awakening-based vehicle battery thermal runaway early warning device is not limited herein.
An embodiment of the present application further provides an electronic device, including: one or more processors; and the storage device is used for storing one or more programs, and when the one or more programs are executed by one or more processors, the electronic equipment is enabled to realize the early warning method for the thermal runaway of the vehicle battery based on the patrol awakening provided by the embodiments.
FIG. 5 illustrates a schematic structural diagram of a computer system suitable for use in implementing the electronic device of an embodiment of the present application. It should be noted that the computer system 500 of the electronic device shown in fig. 5 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.
As shown in fig. 5, the computer system 500 includes a Central Processing Unit (CPU) 501, which can perform various appropriate actions and processes, such as executing the methods in the above-described embodiments, according to a program stored in a Read-Only Memory (ROM) 502 or a program loaded from a storage section 508 into a Random Access Memory (RAM) 503. In the RAM 503, various programs and data necessary for system operation are also stored. The CPU 501, ROM 502, and RAM 503 are connected to each other via a bus 504. An Input/Output (I/O) interface 505 is also connected to bus 504.
The following components are connected to the I/O interface 505: an input portion 506 including a keyboard, a mouse, and the like; an output section 507 including a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, a speaker, and the like; a storage portion 508 including a hard disk and the like; and a communication section 509 including a Network interface card such as a LAN (Local Area Network) card, a modem, or the like. The communication section 509 performs communication processing via a network such as the internet. The driver 510 is also connected to the I/O interface 505 as necessary. A removable medium 511 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 510 as necessary, so that a computer program read out therefrom is mounted into the storage section 508 as necessary.
In particular, according to embodiments of the application, the processes described above with reference to the flow diagrams may be implemented as computer software programs. For example, embodiments of the present application include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising a computer program for performing the method illustrated by the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network through the communication section 509, and/or installed from the removable medium 511. The computer program executes various functions defined in the system of the present application when executed by a Central Processing Unit (CPU) 501.
It should be noted that the computer readable medium shown in the embodiments of the present application may be a computer readable signal medium or a computer readable storage medium or any combination of the two. The computer readable storage medium may be, for example, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read-Only Memory (ROM), an Erasable Programmable Read-Only Memory (EPROM), a flash Memory, an optical fiber, a portable Compact Disc Read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present application, a computer-readable signal medium may comprise a propagated data signal with a computer-readable computer program embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the foregoing.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. Each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the embodiments of the present application may be implemented by software, or may be implemented by hardware, and the described units may also be disposed in a processor. Wherein the names of the elements do not in some way constitute a limitation on the elements themselves.
Another aspect of the present application also provides a computer-readable storage medium having a computer program stored thereon, where the computer program, when executed by a processor of a computer, causes the computer to execute the above patrol wake-up based vehicle battery thermal runaway warning method. The computer-readable storage medium may be included in the electronic device described in the above embodiment, or may exist separately without being incorporated in the electronic device.
Another aspect of the application also provides a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer readable storage medium, and executes the computer instructions, so that the computer device executes the inspection wake-up based vehicle battery thermal runaway early warning method provided in the above embodiments.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitutions or changes made by the person skilled in the art on the basis of the present invention are all within the protection scope of the present invention.

Claims (10)

1. A vehicle battery thermal runaway early warning method based on patrol and awakening is characterized by comprising the following steps:
acquiring battery comprehensive data and a battery state threshold of a vehicle power battery in a current inspection period;
comparing the value of the battery comprehensive data with the battery state threshold value to obtain a comparison result;
inputting the battery comprehensive data into a preset risk identification model according to the comparison result to obtain a risk identification result;
according to the risk identification result, the battery comprehensive data is combined to carry out thermal runaway fault judgment on the vehicle power battery, and a fault judgment result is obtained;
and executing thermal runaway early warning when the fault judgment result indicates that the thermal runaway fault exists in the vehicle power battery.
2. The inspection wake-up based vehicle battery thermal runaway early warning method of claim 1, wherein: if the battery state threshold value comprises an undervoltage threshold value, an overvoltage threshold value and a temperature threshold value; then, acquiring a battery state threshold value of the current polling period, including:
acquiring a voltage sampling value CellU1 and a temperature sampling value T1 of the vehicle power battery in the previous polling period, and acquiring a first voltage characteristic value delta U1, a second voltage characteristic value delta U2 and a temperature characteristic value delta T1 of the vehicle power battery; the first voltage characteristic value delta U1, the second voltage characteristic value delta U2 and the temperature characteristic value delta T1 are set according to the battery core characteristics of the power battery;
setting an undervoltage threshold according to the voltage sampling value CellU1 and the first voltage characteristic value Δ U1, where the undervoltage threshold = CellU1- Δ U1; setting an overvoltage threshold according to the voltage sampling value CellU1 and the second voltage characteristic value Δ U2, wherein the overvoltage threshold = CellU1+ Δ U2; and setting a temperature threshold value according to the temperature sampling value T1 and the temperature characteristic value delta T1, wherein the temperature threshold value = T1+ delta T1.
3. The inspection wake-up based vehicle battery thermal runaway early warning method of claim 2, wherein: if the battery comprehensive data comprises voltage data; comparing the value of the battery comprehensive data with the battery state threshold value to obtain a comparison result, wherein the comparison result comprises the following steps:
comparing a value of the voltage data to the under-voltage threshold and the over-voltage threshold;
when the value of the voltage data is between the undervoltage threshold and the overvoltage threshold, the value of the voltage data is normal; and when the value of the voltage data is smaller than the undervoltage threshold value and/or the value of the voltage data is larger than the overvoltage threshold value, the value of the voltage data is abnormal.
4. The inspection wake-up based vehicle battery thermal runaway early warning method of claim 3, wherein: if the battery comprehensive data also comprises temperature data; comparing the value of the battery comprehensive data with the battery state threshold value to obtain a comparison result, and further comprising:
comparing the value of the temperature data to the temperature threshold;
when the value of the temperature data is smaller than the temperature threshold value, the value of the temperature data is normal; when the value of the temperature data is greater than or equal to the temperature threshold value, the value of the temperature data is abnormal.
5. The inspection wake-up based vehicle battery thermal runaway early warning method of claim 4, wherein: if the battery comprehensive data also comprises current data and air pressure data; carrying out thermal runaway risk identification on the vehicle power battery according to the comparison result and by combining the battery comprehensive data to obtain a risk identification result; the method comprises the following steps:
when the voltage data and the temperature data are abnormal, inputting the voltage data, the temperature data, the current data and the air pressure data into a preset risk identification model to obtain an identification result; the risk identification model comprises a corresponding relation between voltage data and an identification result, a corresponding relation between temperature data and the identification result, a corresponding relation between current data and the identification result, and a corresponding relation between air pressure data and the identification result.
6. The inspection wake-up based vehicle battery thermal runaway early warning method according to claim 5, wherein; and carrying out thermal runaway fault judgment on the vehicle power battery according to the risk identification result and the battery comprehensive data to obtain a fault judgment result, wherein the fault judgment result comprises the following steps:
when the risk identification result of the vehicle power battery has a thermal runaway risk and simultaneously meets the target condition, judging that the vehicle power battery has a thermal runaway fault; otherwise, judging that the thermal runaway fault does not exist in the vehicle power battery, and ending the current inspection cycle when the duration time of the thermal runaway fault does not exist in the vehicle power battery exceeds a preset time threshold;
when the battery comprehensive data further comprises differential pressure data, voltage drop data, insulation state data and voltage rise data, the target conditions comprise:
the voltage difference data are larger than a preset voltage difference threshold value, the voltage drop data are larger than a preset voltage drop threshold value, the insulation state data comprise insulation faults, and the voltage rise data are larger than a preset voltage transformation change threshold value.
7. The inspection wake-up based vehicle battery thermal runaway early warning method of claim 6, wherein: performing a thermal runaway warning, comprising:
and sending the pre-generated alarm information to a preset object to execute thermal runaway early warning.
8. The utility model provides a vehicle battery thermal runaway early warning device based on it awakens up to patrol and examine, a serial communication port, the device includes:
the acquisition module is used for acquiring battery comprehensive data and a battery state threshold of the vehicle power battery in the current inspection period;
the comparison module is used for comparing the value of the battery comprehensive data with the battery state threshold value to obtain a comparison result;
the identification module is used for inputting the battery comprehensive data into a preset risk identification model according to the comparison result to obtain a risk identification result;
the judging module is used for carrying out thermal runaway fault judgment on the vehicle power battery according to the risk identification result and the battery comprehensive data to obtain a fault judgment result;
and the early warning module is used for executing thermal runaway early warning when the fault judgment result indicates that the thermal runaway fault exists in the vehicle power battery.
9. An electronic device, comprising:
one or more processors;
a storage device to store one or more programs that, when executed by the one or more processors, cause the electronic device to implement the patrol wake-based vehicle battery thermal runaway early warning method of any one of claims 1 to 7.
10. A computer readable storage medium having computer readable instructions stored thereon, which when executed by a processor of a computer, cause the computer to perform the patrol wakefulness based vehicle battery thermal runaway warning method of any one of claims 1 to 7.
CN202211216196.9A 2022-09-30 2022-09-30 Early warning method, device and equipment for thermal runaway of vehicle battery based on inspection wakeup and storage medium Pending CN115411388A (en)

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