CN112549965A - Power battery thermal runaway processing method and device and electric automobile - Google Patents
Power battery thermal runaway processing method and device and electric automobile Download PDFInfo
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- CN112549965A CN112549965A CN201910922665.0A CN201910922665A CN112549965A CN 112549965 A CN112549965 A CN 112549965A CN 201910922665 A CN201910922665 A CN 201910922665A CN 112549965 A CN112549965 A CN 112549965A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- 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
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
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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
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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
- H01M10/4221—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells with battery type recognition
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/549—Current
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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
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/10—Temperature sensitive devices
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using 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
Abstract
The invention relates to the technical field of safety of power batteries of electric automobiles, and discloses a thermal runaway treatment method and device for a power battery and an electric automobile, wherein the method comprises the following steps: collecting working parameters of the power battery in a starting working state; when the working parameters meet a preset first condition, determining that the power battery has a thermal runaway risk; acquiring fault parameters of the power battery after the power battery is determined to have a thermal runaway risk; the fault parameters comprise the temperature of the power battery, the ambient temperature, the insulation resistance value of the power battery and the internal resistance value of the power battery; identifying faults of the power battery according to the fault parameters; and when the power battery is identified to be in thermal runaway fault, executing thermal runaway fault processing. The method and the device can effectively identify whether the power battery has the thermal runaway fault or not, so that corresponding thermal runaway fault processing can be timely executed when the power battery has the thermal runaway fault, and the safety of the power battery is further improved.
Description
Technical Field
The invention relates to the technical field of safety of power batteries of electric automobiles, in particular to a thermal runaway treatment method and device for a power battery and an electric automobile.
Background
The electric automobile is a vehicle which takes a vehicle-mounted power supply as power and drives wheels to run through a motor, and the safety problem of the electric automobile is mainly that of a power battery; among them, thermal runaway of power batteries is one of the most dangerous accidents of electric vehicles. Therefore, prevention and control of thermal runaway of a power battery of an electric vehicle are important to improve safety of the electric vehicle.
In recent years, anyeason et al, the university of qinghua, proposed a power cell electrode material thermal stability determination method, determination apparatus and computer-readable storage medium (CN201810123757.8), the method comprising selecting temperature data of a first power cell electrode material; obtaining heat generation power data of the first power battery electrode material according to the temperature data of the first power battery electrode material and a thermal decomposition reaction kinetic model of the electrode material; and comparing the heat generation power data with a standard value, and judging the thermal stability of the first power battery electrode material. The method can be used for evaluating the thermal stability of the first power battery electrode material at different temperatures so as to comprehensively evaluate the thermal stability of the first power battery electrode material, and therefore the evaluation efficiency of the thermal stability of the electrode material can be improved. However, the method needs to acquire more internal temperature of the battery, and simultaneously needs to compare the temperature after thermal shock for a long time with the thermal runaway standard value, so that the calculation workload is large, and the time required for judgment is long, therefore, the method is difficult to make accurate judgment in a short time, so that the method is difficult to effectively predict the thermal runaway risk of the power battery, and the safety of the power battery cannot be ensured.
Disclosure of Invention
The invention aims to provide a thermal runaway processing method and device for a power battery and an electric automobile, which can effectively identify the thermal runaway fault of the power battery, thereby improving the safety of the power battery.
In order to solve the technical problem, the invention provides a thermal runaway processing method for a power battery, which comprises the following steps:
collecting working parameters of the power battery in a starting working state;
when the working parameters meet a preset first condition, determining that the power battery has a thermal runaway risk;
acquiring fault parameters of the power battery after the power battery is determined to have the risk of thermal runaway; the fault parameters comprise the temperature of the power battery, the ambient temperature, the insulation resistance value of the power battery and the internal resistance value of the power battery;
identifying the fault of the power battery according to the fault parameter;
and when the fault of the power battery is identified to be a thermal runaway fault, executing thermal runaway fault processing.
As a preferable scheme, the identifying the fault of the power battery according to the fault parameter specifically includes:
judging whether the fault parameters meet a preset second condition or not; wherein the preset second condition is that: the temperature of the power battery is greater than a preset first battery temperature threshold, the environment temperature is greater than a preset first environment temperature threshold, the insulation resistance value of the power battery is less than a preset first insulation resistance value threshold, and the internal resistance value of the power battery is greater than a preset first internal resistance value;
when the fault parameters meet a preset second condition, identifying that the fault of the power battery is a thermal runaway fault;
and when the fault parameter does not meet a preset second condition, identifying that the fault of the power battery is a non-thermal runaway fault.
Preferably, the method for controlling thermal runaway of the power battery further includes:
when the working parameters do not meet a preset first condition, determining that the power battery does not have a thermal runaway risk;
after determining that the power battery does not have the thermal runaway risk, acquiring the temperature of the power battery, the ambient temperature, the insulation resistance value of the power battery and the internal resistance value of the power battery;
and when the temperature of the power battery is less than or equal to a preset second battery temperature threshold, the environment temperature is less than or equal to a preset second environment temperature threshold, the insulation resistance value of the power battery is greater than or equal to a preset second insulation resistance value threshold, and the internal resistance value of the power battery is less than or equal to a preset second internal resistance value, controlling the power battery to enter a working mode.
Preferably, the working parameters comprise the voltage of the power battery, the temperature rise speed of the power battery, the highest temperature of the power battery, the temperature difference of the power battery and the pressure inside the power battery;
the preset first condition is that:
the voltage of the power battery is smaller than a preset voltage threshold, the temperature rise speed of the power battery is larger than a preset temperature rise speed threshold, the highest temperature of the power battery is larger than a preset highest temperature threshold, the temperature difference of the power battery is larger than a preset temperature difference threshold, and the pressure inside the power battery is larger than a preset pressure threshold.
As a preferable scheme, before the collecting the working parameters of the power battery in the starting working state, the method further comprises the following steps:
collecting the temperature of the power battery, the insulation resistance value of the power battery and the internal resistance value of the power battery;
and when the temperature of the power battery is greater than a preset third battery temperature threshold, the insulation resistance value of the power battery is smaller than a preset third insulation resistance value threshold, and the internal resistance value of the power battery is greater than a preset third internal resistance value threshold, determining that the power battery is started to work.
Preferably, the power battery is a square hard-shell battery adopting liquid-cooling thermal management, and a temperature sensor is arranged at the bottom of the power battery; then, the acquiring the temperature of the power battery specifically includes: acquiring the temperature of the bottom of the power battery as the temperature of the power battery through the temperature sensor;
or the power battery is a square hard shell battery adopting air-cooled thermal management, a cylindrical battery adopting liquid-cooled thermal management or a cylindrical battery adopting air-cooled thermal management, and a temperature sensor is arranged on the shell of the power battery; then, the acquiring the temperature of the power battery specifically includes: acquiring the temperature of the shell of the power battery as the temperature of the power battery through the temperature sensor;
or the power battery is a square hard-shell battery adopting natural cooling type thermal management or a cylindrical battery adopting natural cooling type thermal management, and a temperature sensor is arranged on an electrode of the power battery; then, the acquiring the temperature of the power battery specifically includes: acquiring the temperature of an electrode of the power battery as the temperature of the power battery through the temperature sensor;
or the type of the power battery is a soft package battery adopting liquid cooling type thermal management or a soft package battery adopting air cooling type thermal management, and a temperature sensor is arranged on the surface of the power battery; then, the acquiring the temperature of the power battery specifically includes: acquiring the surface temperature of the power battery as the temperature of the power battery through the temperature sensor;
or the type of the power battery is a soft package battery adopting natural cooling type heat management, and a tab of the power battery is provided with a temperature sensor; then, the acquiring the temperature of the power battery specifically includes: and acquiring the temperature of a lug of the power battery through the temperature sensor to serve as the temperature of the power battery.
Preferably, the method for controlling thermal runaway of the power battery further includes:
and when the fault of the power battery is identified to be a non-thermal runaway fault, executing corresponding non-thermal runaway fault processing.
In order to solve the same technical problem, the invention also provides a thermal runaway processing device for the power battery, which comprises:
the working parameter acquisition module is used for acquiring working parameters of the power battery in a starting working state;
the thermal runaway risk module is used for determining that the power battery has a thermal runaway risk when the working parameters meet a preset first condition;
the fault parameter acquisition module is used for acquiring fault parameters of the power battery after the power battery is determined to have the thermal runaway risk; the fault parameters comprise the temperature of the power battery, the ambient temperature, the insulation resistance value of the power battery and the internal resistance value of the power battery;
the fault identification module is used for identifying the fault of the power battery according to the fault parameter; and the number of the first and second groups,
and the thermal runaway fault processing module is used for executing thermal runaway fault processing when the fault of the power battery is identified to be the thermal runaway fault.
In order to solve the same technical problem, the invention also provides another power battery thermal runaway processing device, which comprises: the device comprises a memory, a processor and a power battery thermal runaway processing program which is stored on the memory and can run on the memory, wherein the power battery thermal runaway processing program realizes the power battery thermal runaway processing method when being executed by the processor.
In order to solve the same technical problem, the invention further provides an electric vehicle which comprises a power battery and the thermal runaway processing device for the power battery, wherein the power battery is electrically connected with the thermal runaway processing device for the power battery.
Compared with the prior art, according to the power battery thermal runaway processing method, the power battery thermal runaway processing device and the electric vehicle provided by the invention, when the collected working parameters of the power battery in the starting working state meet the preset first condition, the fact that the power battery has a thermal runaway risk is determined, and after the fact that the power battery has the thermal runaway risk is determined, the fault parameters of the power battery are collected, so that the fault of the power battery is identified according to the fault parameters, whether the thermal runaway fault occurs in the power battery can be effectively identified, the corresponding thermal runaway fault processing can be timely executed when the thermal runaway fault occurs in the power battery, and the safety of the power battery is further improved. In addition, the invention adopts various parameters to comprehensively identify whether the power battery has the thermal runaway fault, thereby avoiding the phenomenon of misinformation of the thermal runaway fault and improving the user experience.
Drawings
FIG. 1 is a schematic flow diagram of one embodiment of a thermal runaway processing method for a power cell in an embodiment of the invention;
FIG. 2 is a schematic flow diagram of another embodiment of a thermal runaway processing method for a power battery in an embodiment of the invention;
fig. 3 is a schematic structural diagram of a thermal runaway processing device for a power battery in an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic flow chart of a thermal runaway processing method for a power battery according to an embodiment of the present invention is shown.
The thermal runaway processing method for the power Battery provided by the embodiment of the invention can be executed by a Battery Management System (BMS), and the embodiment is described by taking the BMS as an execution subject.
In the embodiment of the invention, the thermal runaway processing method for the power battery comprises the following steps of S11-S15:
and S11, collecting working parameters of the power battery in a starting working state.
Specifically, after waking up the BMS, the BMS performs self-checking, and after the self-checking is passed, working parameters of the power battery in a starting working state are collected. In a preferred embodiment, in order to effectively identify whether the power battery has a thermal runaway risk, the collected working parameters comprise the voltage of the power battery, the temperature rise speed of the power battery, the highest temperature of the power battery, the temperature difference of the power battery and the pressure inside the power battery. The temperature difference of the power battery is specifically the difference between the highest temperature and the lowest temperature of the power battery.
And S12, when the working parameters meet a preset first condition, determining that the power battery has a thermal runaway risk.
In step S12, the preset first condition is that:
the voltage of the power battery is smaller than a preset voltage threshold, the temperature rise speed of the power battery is larger than a preset temperature rise speed threshold, the highest temperature of the power battery is larger than a preset highest temperature threshold, the temperature difference of the power battery is larger than a preset temperature difference threshold, and the pressure inside the power battery is larger than a preset pressure threshold.
It can be understood that when the collected voltage of the power battery is smaller than the voltage threshold, the temperature rise speed of the power battery is larger than the temperature rise speed threshold, the maximum temperature of the power battery is larger than the maximum temperature threshold, the temperature difference of the power battery is larger than the temperature difference threshold, and the pressure inside the power battery is larger than the pressure threshold, it indicates that the voltage of the power battery is too low, the temperature rise speed of the power battery is too high, the maximum temperature of the power battery is too high, the temperature difference of the power battery is too large, and the pressure inside the power battery is too high, and the pressure threshold allowed by the air release valve is exceeded, so that it can be determined that the power battery has a thermal runaway risk. It should be noted that the voltage threshold, the temperature rise speed threshold, the maximum temperature threshold, the temperature difference threshold, and the pressure threshold may be set according to actual use conditions, for example, may be adjusted according to an ambient temperature, a working mode of the power battery, a material of the power battery, and the like, which is not limited in the present invention.
S13, collecting fault parameters of the power battery after the power battery is determined to have the thermal runaway risk; the fault parameters comprise the temperature of the power battery, the ambient temperature, the insulation resistance value of the power battery and the internal resistance value of the power battery.
It should be noted that the collected fault parameters include, but are not limited to, the temperature of the power battery, the ambient temperature, the insulation resistance value of the power battery, and the internal resistance value of the power battery.
In addition, after the power battery is determined to have the thermal runaway risk, the method further comprises the following steps: and carrying out thermal runaway pretreatment on the power battery. It can be understood that after it is determined that the power battery has the risk of thermal runaway, corresponding processing may be performed on the risk of thermal runaway that the power battery has, so as to reduce the risk of occurrence of thermal runaway, thereby ensuring the safety of the power battery, and ensuring the safety of a driver.
S14, identifying the fault of the power battery according to the fault parameter;
in step S14, the identifying the fault of the power battery according to the fault parameter specifically includes the following steps:
judging whether the fault parameters meet a preset second condition or not; wherein the preset second condition is that: the temperature of the power battery is greater than a preset first battery temperature threshold, the environment temperature is greater than a preset first environment temperature threshold, the insulation resistance value of the power battery is less than a preset first insulation resistance value threshold, and the internal resistance value of the power battery is greater than a preset first internal resistance value;
when the fault parameters meet a preset second condition, identifying that the fault of the power battery is a thermal runaway fault;
and when the fault parameter does not meet a preset second condition, identifying that the fault of the power battery is a non-thermal runaway fault.
It can be understood that when the collected temperature of the power battery is greater than the first battery temperature threshold, the environment temperature is greater than the first environment temperature threshold, the insulation resistance value of the power battery is less than the first insulation resistance value threshold, and the internal resistance value of the power battery is greater than the first internal resistance value, it is determined that the power battery has a thermal runaway fault; and when the temperature of the power battery is less than or equal to the first battery temperature threshold, the environment temperature is less than or equal to the first environment temperature threshold, the insulation resistance value of the power battery is greater than or equal to the first insulation resistance value threshold, or the internal resistance value of the power battery is less than or equal to the first internal resistance value, determining that the power battery has a non-thermal runaway fault. It should be noted that the first battery temperature threshold, the first environment temperature threshold, the first insulation resistance threshold, and the first internal resistance may be set according to actual use conditions, for example, the first battery temperature threshold, the first environment temperature threshold, the first insulation resistance threshold, and the first internal resistance may be adjusted according to environment temperature, a working mode of the power battery, a material of the power battery, and the like, which is not limited in the present invention.
In another preferred embodiment, when the fault parameters of the power battery are collected, the current state of a pressure reducing valve of the power battery is also detected, and whether electrolyte leaks inside the power battery is detected; when the collected temperature of the power battery is smaller than or equal to a first battery temperature threshold value, the insulation resistance value of the power battery is larger than or equal to a first insulation resistance value threshold value, the internal resistance value of the power battery is smaller than or equal to a first internal resistance value, and the current state of a pressure reducing valve of the power battery is detected to be a closed state, or when the collected temperature of the power battery is smaller than or equal to the first battery temperature threshold value, the insulation resistance value of the power battery is larger than or equal to the first insulation resistance value threshold value, the internal resistance value of the power battery is smaller than or equal to the first internal resistance value, and when electrolyte leakage is detected in the power battery, the fault of the power battery can be determined to be the non-thermal runaway fault.
And S15, when the fault of the power battery is identified to be a thermal runaway fault, executing thermal runaway fault processing.
When the thermal runaway fault occurs in the power battery, the battery pack may be ignited and exploded, and therefore, in order to ensure the safety of personnel, when the thermal runaway fault is identified as the thermal runaway fault, thermal runaway fault processing needs to be performed in time. Wherein the executing the thermal runaway fault processing specifically comprises: and uploading the thermal runaway fault information to a monitoring platform through a remote monitoring network, and executing corresponding fault treatment, such as reducing the power of the power battery, prohibiting the power battery from charging, starting a fire extinguishing device and the like.
In the embodiment of the invention, when the collected working parameters of the power battery in the starting working state meet the preset first condition, the power battery is determined to have the thermal runaway risk, and after the power battery is determined to have the thermal runaway risk, the fault parameters of the power battery are collected to identify the fault of the power battery according to the fault parameters, so that whether the thermal runaway fault occurs in the power battery can be effectively identified, the corresponding thermal runaway fault treatment can be timely executed when the thermal runaway fault occurs in the power battery, the safety of the power battery is further improved, and the safety of drivers is ensured. In addition, the invention adopts various parameters to comprehensively identify whether the power battery has the thermal runaway fault, thereby avoiding the phenomenon of misinformation of the thermal runaway fault and improving the user experience.
Further, in the embodiment of the present invention, the method for controlling thermal runaway of the power battery further includes step S16:
and S16, when the power battery is identified to have the fault of non-thermal runaway, executing corresponding non-thermal runaway fault processing.
Specifically, the executing the corresponding non-thermal runaway fault processing specifically includes: and uploading the non-thermal runaway fault information to a monitoring platform through a remote monitoring network, and executing corresponding fault processing.
It should be noted that the non-thermal runaway fault includes a general fault and a system false alarm; the general fault refers to a fault which can be automatically recovered, for example, the current of the power battery is too large, after the current is reduced to a safe value, the alarm prompt of the fault disappears, and the power battery can be continuously used; in addition, a fault requiring comprehensive confirmation of a plurality of signals can be regarded as a system false alarm if only a single fault is confirmed and no other corresponding signal verification confirms, for example, an insulation fault, and the occurrence of the insulation fault can be confirmed only after continuously confirming for more than 5 times.
In a preferred embodiment, as shown in fig. 2, after the step S11 is executed to collect the operating parameters of the power battery in the starting operating state, the method for controlling thermal runaway of the power battery further includes the following steps S12 '-S14':
s12', when the working parameters do not meet the preset first condition, determining that the power battery does not have the thermal runaway risk;
s13', collecting the temperature, the environment temperature, the insulation resistance value and the internal resistance value of the power battery after determining that the power battery has no thermal runaway risk;
s14', when the temperature of the power battery is smaller than or equal to a preset second battery temperature threshold value, the environment temperature is smaller than or equal to a preset second environment temperature threshold value, the insulation resistance value of the power battery is larger than or equal to a preset second insulation resistance value threshold value, and the internal resistance value of the power battery is smaller than or equal to a preset second internal resistance value, the power battery is controlled to enter a working mode.
Specifically, when the collected voltage of the power battery is greater than or equal to a preset voltage threshold, the temperature rise speed of the power battery is less than or equal to a preset temperature rise speed threshold, the maximum temperature of the power battery is less than or equal to a preset maximum temperature threshold, the temperature difference of the power battery is less than or equal to a preset temperature difference threshold, or the internal pressure of the power battery is less than or equal to a preset pressure threshold, it is determined that the power battery does not have a thermal runaway risk; and after the power battery is determined not to have the thermal runaway risk, identifying whether the power battery can enter a working mode or not by acquiring the temperature of the power battery, the ambient temperature, the insulation resistance value of the power battery and the internal resistance value of the power battery and comparing the acquired temperature, the ambient temperature, the insulation resistance value of the power battery and the internal resistance value of the power battery with corresponding threshold values. It should be noted that the second battery temperature threshold, the second ambient temperature threshold, the second insulation resistance threshold, and the second internal resistance may be set according to actual use conditions, for example, the second battery temperature threshold, the second ambient temperature threshold, the second insulation resistance threshold, and the second internal resistance may be adjusted according to ambient temperature, a working mode of the power battery, and a material of the power battery, and the invention is not limited.
In addition, in the actual Control process, after the BMS receives a request sent by a VCU (Vehicle Control Unit) that the power battery enters the working mode, the BMS may Control the power battery to enter the working mode when recognizing that the power battery can enter the working mode according to the parameters, which is not described herein in further detail. In addition, after the power battery is controlled to enter the working mode, the above steps S11-S15 are executed in a loop until the power battery exits the working mode, so that in the process that the power battery is in the working mode, whether the thermal runaway fault occurs in the power battery can be effectively identified, and the normal operation of the power battery is further ensured.
In the embodiment of the invention, after the power battery is determined not to have the thermal runaway risk, and when the collected temperature of the power battery, the collected environment temperature, the collected insulation resistance value of the power battery and the collected internal resistance value of the power battery meet preset conditions, the power battery is controlled to enter a working mode, so that the normal work of the power battery is ensured, and the safety of the power battery is further ensured.
In the embodiment of the present invention, in order to determine that the power battery has started to operate, so as to collect the operating parameters of the power battery in the starting operating state, in a preferred embodiment, before collecting the operating parameters of the power battery in the starting operating state, the following steps S01-S02 are further included:
s01, collecting the temperature of the power battery, the insulation resistance value of the power battery and the internal resistance value of the power battery;
and S02, when the temperature of the power battery is greater than a preset third battery temperature threshold value, the insulation resistance value of the power battery is smaller than a preset third insulation resistance value threshold value, and the internal resistance value of the power battery is greater than a preset third internal resistance value threshold value, determining that the power battery is started to work.
It should be noted that the third battery temperature threshold, the third insulation resistance threshold, and the third internal resistance threshold may be set according to actual use conditions, for example, may be adjusted according to an ambient temperature, a working mode of the power battery, a material of the power battery, and the like, and the present invention is not limited thereto.
In the embodiment of the invention, the structures of the power batteries in the vehicle are different, and the positions of the temperature sensors arranged on the power batteries are also different, so that the monitoring position of the temperature of the power batteries and the position of the power battery thermal runaway danger prevention can be confirmed according to the structures of the power batteries in the vehicle. In a preferred embodiment, the power battery in this embodiment is a square hard-shell battery with liquid-cooling thermal management, and a temperature sensor is disposed at the bottom of the power battery; then, in the above steps S13, S13' and S01, the acquiring the temperature of the power battery specifically includes: acquiring the temperature of the bottom of the power battery as the temperature of the power battery through the temperature sensor;
or the type of the power battery in this embodiment is a square hard-shell battery adopting air-cooled thermal management, a cylindrical battery adopting liquid-cooled thermal management, or a cylindrical battery adopting air-cooled thermal management, and a temperature sensor is arranged on a housing of the power battery; then, in the above steps S13, S13' and S01, the acquiring the temperature of the power battery specifically includes: acquiring the temperature of the shell of the power battery as the temperature of the power battery through a temperature sensor;
or the power battery in this embodiment is a square hard-shell battery adopting natural cooling type thermal management or a cylindrical battery adopting natural cooling type thermal management, and a temperature sensor is arranged on an electrode of the power battery; then, in the above steps S13, S13' and S01, the acquiring the temperature of the power battery specifically includes: acquiring the temperature of an electrode of the power battery as the temperature of the power battery through the temperature sensor;
or the type of the power battery in this embodiment is a soft package battery adopting liquid-cooled thermal management or a soft package battery adopting air-cooled thermal management, and a temperature sensor is arranged on the surface of the power battery; then, in the above steps S13, S13' and S01, the acquiring the temperature of the power battery specifically includes: acquiring the surface temperature of the power battery as the temperature of the power battery through the temperature sensor;
or the type of the power battery in the embodiment is a soft package adopting natural cooling type thermal management, and a tab of the battery power battery is provided with a temperature sensor; then, in the above steps S13, S13' and S01, the acquiring the temperature of the power battery specifically includes: and acquiring the temperature of a lug of the power battery through the temperature sensor to serve as the temperature of the power battery.
Fig. 3 is a schematic structural diagram of a thermal runaway processing device for a power battery according to an embodiment of the present invention; the thermal runaway processing device for the power battery comprises:
the working parameter acquisition module 11 is used for acquiring working parameters of the power battery in a starting working state;
the thermal runaway risk module 12 is configured to determine that the power battery has a thermal runaway risk when the working parameter meets a preset first condition;
the fault parameter acquisition module 13 is used for acquiring fault parameters of the power battery after the power battery is determined to have the risk of thermal runaway; the fault parameters comprise the temperature of the power battery, the ambient temperature, the insulation resistance value of the power battery and the internal resistance value of the power battery;
the fault identification module 14 is used for identifying the fault of the power battery according to the fault parameter; and the number of the first and second groups,
and the thermal runaway fault processing module 15 is configured to execute thermal runaway fault processing when the power battery is identified as a thermal runaway fault.
In the embodiment of the invention, when the collected working parameters of the power battery in the starting working state meet the preset first condition through the thermal runaway risk module 1, it is determined that the power battery has a thermal runaway risk, and after it is determined that the power battery has the thermal runaway risk through the fault parameter collection module 13, the fault parameters of the power battery are collected, so that the fault identification module 14 identifies the fault of the power battery according to the fault parameters, and thus, whether the power battery has the thermal runaway fault can be effectively identified, and the corresponding thermal runaway fault treatment can be timely executed when the power battery has the thermal runaway fault, so that the safety of the power battery is improved, and the safety of drivers is ensured. In addition, the invention adopts various parameters to comprehensively identify whether the power battery has the thermal runaway fault, thereby avoiding the phenomenon of misinformation of the thermal runaway fault and improving the user experience.
In this embodiment of the present invention, the power battery thermal runaway processing apparatus further includes a plurality of modules/units, so that the power battery thermal runaway processing apparatus can implement other steps of the above power battery thermal runaway control method, which will not be described herein.
Correspondingly, the embodiment of the invention also provides another power battery thermal runaway processing device, which comprises: the device comprises a memory, a processor and a power battery thermal runaway processing program which is stored on the memory and can run on the memory, wherein the power battery thermal runaway processing program realizes the power battery thermal runaway processing method when being executed by the processor. The above description of the embodiments can be specifically referred to for the thermal runaway processing method of the power battery, and further details are not described herein.
Correspondingly, the embodiment of the invention also provides an electric automobile which comprises a power battery and the thermal runaway processing device for the power battery, wherein the power battery is electrically connected with the thermal runaway processing device for the power battery.
In summary, according to the thermal runaway processing method and device for the power battery and the electric vehicle provided by the invention, when the collected working parameters of the power battery in the starting working state meet the preset first condition, it is determined that the power battery has a thermal runaway risk, and after it is determined that the power battery has the thermal runaway risk, the fault parameters of the power battery are collected to identify the fault of the power battery according to the fault parameters, so that whether the power battery has the thermal runaway fault can be effectively identified, and the corresponding thermal runaway fault processing can be timely executed when the power battery has the thermal runaway fault, so that the safety of the power battery is improved, and the safety of drivers is ensured. In addition, the invention adopts various parameters to comprehensively identify whether the power battery has the thermal runaway fault, thereby avoiding the phenomenon of misinformation of the thermal runaway fault and improving the user experience. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A thermal runaway treatment method for a power battery is characterized by comprising the following steps:
collecting working parameters of the power battery in a starting working state;
when the working parameters meet a preset first condition, determining that the power battery has a thermal runaway risk;
acquiring fault parameters of the power battery after the power battery is determined to have the risk of thermal runaway; the fault parameters comprise the temperature of the power battery, the ambient temperature, the insulation resistance value of the power battery and the internal resistance value of the power battery;
identifying the fault of the power battery according to the fault parameter;
and when the fault of the power battery is identified to be a thermal runaway fault, executing thermal runaway fault processing.
2. The method for processing thermal runaway of a power battery as claimed in claim 1, wherein the identifying the fault of the power battery according to the fault parameter specifically includes:
judging whether the fault parameters meet a preset second condition or not; wherein the preset second condition is that: the temperature of the power battery is greater than a preset first battery temperature threshold, the environment temperature is greater than a preset first environment temperature threshold, the insulation resistance value of the power battery is less than a preset first insulation resistance value threshold, and the internal resistance value of the power battery is greater than a preset first internal resistance value;
when the fault parameters meet a preset second condition, identifying that the fault of the power battery is a thermal runaway fault;
and when the fault parameter does not meet a preset second condition, identifying that the fault of the power battery is a non-thermal runaway fault.
3. The power battery thermal runaway processing method of claim 1, wherein the power battery thermal runaway control method further comprises:
when the working parameters do not meet a preset first condition, determining that the power battery does not have a thermal runaway risk;
after determining that the power battery does not have the thermal runaway risk, acquiring the temperature of the power battery, the ambient temperature, the insulation resistance value of the power battery and the internal resistance value of the power battery;
and when the temperature of the power battery is less than or equal to a preset second battery temperature threshold, the environment temperature is less than or equal to a preset second environment temperature threshold, the insulation resistance value of the power battery is greater than or equal to a preset second insulation resistance value threshold, and the internal resistance value of the power battery is less than or equal to a preset second internal resistance value, controlling the power battery to enter a working mode.
4. The power battery thermal runaway processing method of claim 1 or claim 3, wherein the operating parameters include power battery voltage, power battery temperature rise rate, power battery maximum temperature, power battery temperature difference, and power battery internal pressure;
the preset first condition is that:
the voltage of the power battery is smaller than a preset voltage threshold, the temperature rise speed of the power battery is larger than a preset temperature rise speed threshold, the highest temperature of the power battery is larger than a preset highest temperature threshold, the temperature difference of the power battery is larger than a preset temperature difference threshold, and the pressure inside the power battery is larger than a preset pressure threshold.
5. The thermal runaway processing method for the power battery as claimed in claim 1, further comprising, before the collecting the operating parameters of the power battery in the starting operating state:
collecting the temperature of the power battery, the insulation resistance value of the power battery and the internal resistance value of the power battery;
and when the temperature of the power battery is greater than a preset third battery temperature threshold, the insulation resistance value of the power battery is smaller than a preset third insulation resistance value threshold, and the internal resistance value of the power battery is greater than a preset third internal resistance value threshold, determining that the power battery is started to work.
6. The thermal runaway treatment method for the power battery according to any one of claims 2, 3 and 5, wherein the power battery is a square hard-shell battery adopting liquid cooling thermal management, and a temperature sensor is arranged at the bottom of the power battery; then, the acquiring the temperature of the power battery specifically includes: acquiring the temperature of the bottom of the power battery as the temperature of the power battery through the temperature sensor;
or the power battery is a square hard shell battery adopting air-cooled thermal management, a cylindrical battery adopting liquid-cooled thermal management or a cylindrical battery adopting air-cooled thermal management, and a temperature sensor is arranged on the shell of the power battery; then, the acquiring the temperature of the power battery specifically includes: acquiring the temperature of the shell of the power battery as the temperature of the power battery through the temperature sensor;
or the power battery is a square hard-shell battery adopting natural cooling type thermal management or a cylindrical battery adopting natural cooling type thermal management, and a temperature sensor is arranged on an electrode of the power battery; then, the acquiring the temperature of the power battery specifically includes: acquiring the temperature of an electrode of the power battery as the temperature of the power battery through the temperature sensor;
or the type of the power battery is a soft package battery adopting liquid cooling type thermal management or a soft package battery adopting air cooling type thermal management, and a temperature sensor surface is arranged on the surface of the power battery; then, the acquiring the temperature of the power battery specifically includes: acquiring the surface temperature of the power battery as the temperature of the power battery through the temperature sensor;
or the type of the power battery is a soft package battery adopting natural cooling type heat management, and a tab of the power battery is provided with a temperature sensor; then, the acquiring the temperature of the power battery specifically includes: and acquiring the temperature of a lug of the power battery through the temperature sensor to serve as the temperature of the power battery.
7. The power battery thermal runaway processing method of claim 1 or claim 2, wherein the power battery thermal runaway control method further comprises:
and when the fault of the power battery is identified to be a non-thermal runaway fault, executing corresponding non-thermal runaway fault processing.
8. A thermal runaway processing device for a power battery is characterized by comprising:
the working parameter acquisition module is used for acquiring working parameters of the power battery in a starting working state;
the thermal runaway risk module is used for determining that the power battery has a thermal runaway risk when the working parameters meet a preset first condition;
the fault parameter acquisition module is used for acquiring fault parameters of the power battery after the power battery is determined to have the thermal runaway risk; the fault parameters comprise the temperature of the power battery, the ambient temperature, the insulation resistance value of the power battery and the internal resistance value of the power battery;
the fault identification module is used for identifying the fault of the power battery according to the fault parameter; and the number of the first and second groups,
and the thermal runaway fault processing module is used for executing thermal runaway fault processing when the fault of the power battery is identified to be the thermal runaway fault.
9. A thermal runaway processing device for a power battery is characterized by comprising: the device comprises a memory, a processor and a power battery thermal runaway processing program which is stored on the memory and can run on the memory, wherein the power battery thermal runaway processing program realizes the power battery thermal runaway processing method according to any one of claims 1 to 7 when being executed by the processor.
10. An electric vehicle, characterized by comprising a power battery and the thermal runaway processing device for the power battery according to claim 8 or 9, wherein the power battery is electrically connected with the thermal runaway processing device for the power battery.
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