CN111890988A - Battery thermal runaway detection method and device, battery management system and vehicle - Google Patents
Battery thermal runaway detection method and device, battery management system and vehicle Download PDFInfo
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- CN111890988A CN111890988A CN202010681865.4A CN202010681865A CN111890988A CN 111890988 A CN111890988 A CN 111890988A CN 202010681865 A CN202010681865 A CN 202010681865A CN 111890988 A CN111890988 A CN 111890988A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The embodiment of the application provides a battery thermal runaway detection method, a device, a battery management system, a vehicle and a storage medium, wherein the battery thermal runaway detection method comprises the steps of obtaining temperature information of a battery; determining whether the temperature change of the battery in a preset time period accords with a preset thermal runaway temperature early warning curve or not according to the temperature information; and if the temperature change accords with the thermal runaway temperature early warning curve and the maximum temperature value in the preset time period is greater than or equal to a preset value, sending out early warning information. The battery thermal runaway detection method provided by the embodiment of the application can be used for early warning the thermal runaway of the battery in advance, and the condition that a user has enough escape time is ensured.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery thermal runaway detection method and device, a battery management system and a vehicle.
Background
As a core energy source of an electric vehicle, a trigger mechanism of thermal runaway of a power battery is a complex chemical reaction process, which may be caused by a single factor or a combination of multiple factors in negative electrode precipitation of active lithium, short circuit in the battery, and release of active oxygen from a positive electrode. The vehicle can be ignited when the power battery is in thermal runaway, the ignition caused by the thermal runaway is not pure electrical ignition, and the heat generated by the electrochemical reaction of the power battery can positively strengthen the intensity of the ignition, so that the traditional fire extinguishing mode has little effect on extinguishing the power battery. Therefore, the detection of thermal runaway of power batteries is the focus of research by researchers in the field.
Disclosure of Invention
In view of the above problems, embodiments of the present application provide a battery thermal runaway detection method, device, battery management system, vehicle and storage medium to solve the above technical problems.
The embodiment of the application is realized by adopting the following technical scheme:
in a first aspect, some embodiments of the present application provide a method for detecting thermal runaway of a battery, including obtaining temperature information of the battery; determining whether the temperature change of the battery in a preset time period accords with a preset thermal runaway temperature early warning curve or not according to the temperature information; and if the temperature change accords with the thermal runaway temperature early warning curve and the maximum temperature value in the preset time period is greater than or equal to a preset value, sending out early warning information.
In a second aspect, some embodiments of the present application further provide a battery thermal runaway detection device, including a temperature acquisition module, a determination module, and an early warning module, where the temperature acquisition module is configured to acquire temperature information of a battery; the determining module is used for determining whether the temperature change of the battery in a preset time period accords with a preset thermal runaway temperature early warning curve or not according to the temperature information; the early warning module is used for sending out early warning information if the temperature change accords with the thermal runaway temperature early warning curve and the maximum temperature value in the preset time period is greater than or equal to a preset value.
In a third aspect, some embodiments of the present application further provide a battery management system, which includes a processor and a memory, where the memory stores computer program instructions, and the computer program instructions, when called by the processor, execute the battery thermal runaway detection method described above.
In a fourth aspect, some embodiments of the present application further provide a vehicle, including a vehicle body, a battery, and the battery management system as described above disposed in the vehicle body, wherein the battery management system is electrically connected to the battery.
In a fifth aspect, an embodiment of the present application further provides a computer-readable storage medium, which stores program codes, wherein the program codes, when executed by a processor, perform the battery thermal runaway detection method.
According to the battery thermal runaway detection method and device, the battery management system, the vehicle and the storage medium, the battery thermal runaway detection method is used for obtaining the temperature information of the battery; determining whether the temperature change of the battery in a preset time period accords with a preset thermal runaway temperature early warning curve or not according to the temperature information; and finally, when the temperature change accords with the thermal runaway temperature early warning curve within a preset time period and the maximum temperature value within the preset time period is greater than or equal to a preset value, sending early warning information so as to early warn the thermal runaway of the battery in advance and ensure that a user has enough escape time.
These and other aspects of the present application will be more readily apparent from the following description of the embodiments.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a schematic flow chart of a battery thermal runaway detection method provided by an embodiment of the present application.
Fig. 2 shows a schematic flow chart of another battery thermal runaway detection method provided in the embodiment of the present application.
Fig. 3 shows a schematic flowchart of steps S211 to S214 provided in an embodiment of the present application.
Fig. 4 shows a block diagram of a battery thermal runaway detection device provided in an embodiment of the present application.
Fig. 5 shows a block diagram of a battery management system according to an embodiment of the present application
Fig. 6 shows a schematic structural diagram of a vehicle according to an embodiment of the present application.
Fig. 7 illustrates a block diagram of a computer-readable storage medium according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
Description of terms:
voltage platform: in the process of charging and discharging of the lithium battery, the voltage approaches a gentle stage.
Charge-discharge multiplying power: it refers to the current value required by the battery to discharge its rated capacity from a specified time, and is equal to a multiple of the battery's rated capacity in data value, generally indicated by the letter C.
Battery Management System (BMS): and the system is responsible for controlling the charging and discharging of the battery, realizing the estimation of the state of the battery and the like.
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all 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 application.
As shown in fig. 1, fig. 1 schematically shows a flow chart of a battery thermal runaway detection method 100 provided by an embodiment of the present application. The battery thermal runaway detection method 100 may include the following steps S110 to S130.
Step S110: temperature information of the battery is acquired.
In this embodiment, the temperature of the battery can be monitored in real time through the battery management system, and then the temperature information of the battery can be obtained. Further, the temperature of the battery can be sampled at a preset time period, and then the temperature information of the battery can be obtained.
The temperature information may include, but is not limited to, a temperature change of the battery over the duration, a temperature change curve of the battery over the duration, and the like.
Step S120: and determining whether the temperature change of the battery in a preset time period accords with a preset thermal runaway temperature early warning curve or not according to the temperature information.
The preset thermal runaway temperature early warning curve is used for representing the temperature change condition of the thermal runaway of the battery. In this embodiment, whether the temperature change of the battery within the preset time conforms to the thermal runaway temperature early warning curve or not may be determined according to the temperature difference between the battery temperature at each time point within the preset time period and each temperature value on a certain section of a continuous curve of the thermal runaway temperature early warning curve. Specifically, when the temperature difference is within a preset temperature difference, it may be considered that the temperature change of the battery within a preset time conforms to a thermal runaway temperature early warning curve.
In some embodiments, the battery temperature at each time point in a preset time period may be plotted as a temperature change curve in the preset time period, and then, whether the temperature change of the battery in the preset time period conforms to the thermal runaway temperature early warning curve or not is determined according to the change rate of the temperature change curve and the change rate of a certain section of continuous curve of the thermal runaway temperature early warning curve. Specifically, when the difference between the change rate of the temperature change curve and the change rate of the thermal runaway temperature early warning curve is within the preset change rate difference, it can be considered that the temperature change of the battery within the preset time conforms to the thermal runaway temperature early warning curve.
Step S130: and if the temperature change accords with a thermal runaway temperature early warning curve and the maximum temperature value in a preset time period is greater than or equal to a preset value, sending out early warning information.
In this embodiment, if the temperature change conforms to the thermal runaway temperature warning curve and the maximum temperature value in the preset time period is greater than or equal to the preset value, it indicates that the battery state is close to the thermal runaway state, and at this time, warning information may be sent out in advance to warn the user, thereby ensuring that the user has sufficient escape time.
Further, the warning information may include, but is not limited to, at least one of a buzzer warning, a light warning, and a voice broadcast warning.
The battery thermal runaway detection method provided by the embodiment of the application acquires the temperature information of the battery; determining whether the temperature change of the battery in a preset time period accords with a preset thermal runaway temperature early warning curve or not according to the temperature information; and finally, when the temperature change accords with the thermal runaway temperature early warning curve within a preset time period and the maximum temperature value within the preset time period is greater than or equal to a preset value, sending early warning information so as to early warn the thermal runaway of the battery in advance and ensure that a user has enough escape time.
As shown in fig. 2, another battery thermal runaway detection method 200 is further provided in the embodiment of the present application, where the battery thermal runaway detection method 200 may include the following steps S210 to S230.
Step S210: temperature information of the battery is acquired.
In this embodiment, the step S210 may refer to the step S110, and is not described again.
Step S220: and determining whether the temperature change of the battery in a preset time period accords with a preset thermal runaway temperature early warning curve or not according to the temperature information.
In this embodiment, the step S260 may refer to the step S120 specifically, and is not described again.
In addition, the thermal runaway temperature early warning curve in the embodiment of the application can be obtained by testing temperature reference curves of the battery under different working conditions. Specifically, the embodiment further provides a step of determining the thermal runaway temperature early warning curve as a judgment reference, which can be specifically implemented by the following steps S211 to S214.
As shown in fig. 3, in this embodiment, a thermal runaway temperature early warning curve may be determined according to a test temperature reference curve of a battery under at least two different working conditions. Specifically, the test temperature reference curves under various working conditions may be determined according to the test data of the battery under different working conditions, which may be implemented through the following steps S211 to S212. And fitting the test temperature reference curves corresponding to all the working conditions to obtain a thermal runaway temperature early warning curve, which can be realized through the following steps S213 to S214. The implementation of steps S211 to S214 may be as follows.
Step S211: and determining at least two groups of test temperature change curves of the battery under each working condition according to the test data of the battery under various working conditions.
Thermal runaway of a battery is a complex process, and the mechanism leading to thermal runaway has various forms. For example, deformation or puncture of the battery caused by severe collision may cause internal short circuit of the battery, and severe chemical reaction of the electrolyte is caused after the internal short circuit of the battery, so that thermal runaway is caused; either after extreme overcharge or aging of the cell, causing lithium dendrites to puncture the separator causing thermal runaway. Although the mechanisms of the thermal runaway of the battery are various, a certain rule can be obtained for external expression, and the temperature of the battery can change rapidly when the thermal runaway of the battery occurs. According to the embodiment, the test temperature change curve of the battery under each working condition can be determined according to the test data of the battery under different working conditions, and the test temperature change curve can reflect the thermal runaway temperature change characteristic of the battery under each corresponding working condition.
In this embodiment, the plurality of operating conditions may include, but are not limited to, any combination of at least two of the following operating conditions: the battery collision working condition, the battery overcharge working condition, the working condition of a heat source outside the battery and different arrangement working conditions of the battery.
The battery crash conditions may simulate localized battery deformation caused by impacts and compression. In this embodiment, temperature test data of the same battery with different OCV (Open Circuit Voltage) under abuse tests such as collision or extrusion needling can be collected by the temperature collection device, so as to obtain a first test temperature variation curve of thermal runaway changing with time under at least two groups of battery collision conditions under the battery collision condition.
Specifically, at least two groups of batteries with voltages evenly distributed on two sides of the voltage platform may be selected for performing the collision penetration test, wherein voltages of two adjacent groups of batteries in the at least two groups of batteries may be separated by a preset voltage value. For example, groups of cells having cell voltages of, for example, 3.2V, 3.3V, 3.4V may be selected at intervals of 0.1V, and a collision penetration test may be performed on each group of cells. According to the temperature test data, a first test temperature change curve corresponding to the 3.2V battery can be obtained, and the first test temperature change curve reflects the change condition of the temperature of the 3.2V battery along with time under the collision puncture test; a first test temperature change curve corresponding to a 3.3V battery, which reflects the temperature change over time of the 3.3V battery under a crash penetration test; and a first test temperature change curve corresponding to the 3.4V battery, which reflects the temperature change of the 3.4V battery with time under the collision and puncture test. Reference may be made specifically to table 1 below.
| Numbering | Voltage of battery | Temperature measurement temperature change curve |
| 1 | 3.2V | First test temperature Change Curve-1 |
| 2 | 3.3V | First test temperature Change Curve-2 |
| 3 | 3.4V | First test temperature Change Curve-3 |
| … | … | … |
| … | … | … |
| … | … | … |
TABLE 1
Further, the battery overcharge condition can simulate the actual battery overcharge condition. In this embodiment, the temperature acquisition device can be used for acquiring temperature test data in the process of overcharging the same battery with different charging rates until a thermal runaway state occurs, and then a second test temperature change curve of thermal runaway changing along with time under the condition of at least two groups of battery limit overcharging under the battery overcharging working condition is obtained.
Specifically, at least two groups of the same batteries may be selected to perform the overcharge test, where each group of the batteries is charged at different charging rates, and the different charging rates may be separated by a preset rate. For example, the same sets of cells may be subjected to a limit charge test at charge rates of 2C, 3C, and 4C, respectively, at intervals of 1C charge rate until thermal runaway occurs. According to the temperature test data in the whole process, a second test temperature change curve corresponding to the extreme overcharge of the battery at the 2C charging rate can be obtained, and the second test temperature change curve reflects the time change condition of the temperature in the process from the extreme charging of the battery at the 2C charging rate to the thermal runaway; a second test temperature variation curve corresponding to extreme overcharge of the battery at a 3C charge rate, which reflects a time-varying condition of temperature during the process from extreme charging of the battery at the 3C charge rate to thermal runaway; and a second test temperature change curve corresponding to a limit overcharge of the battery at a 4C charge rate, which reflects a time-varying condition of temperature during a limit charge to thermal runaway of the battery at the 4C charge rate. It can be specifically referred to the following table 2.
| Numbering | Multiplying power of charging | Test temperature change curve |
| 1 | 2C | Second test temperature Change Curve-1 |
| 2 | 3C | Second test temperature Change Curve-2 |
| 3 | 4C | Second test temperature Change Curve-3 |
| … | … | … |
| … | … | … |
| … | … | … |
TABLE 2
In addition, it should be noted that although the overcharge test may cause the overcharge of a plurality of batteries at the same time, the thermal runaway of the battery in a certain module usually occurs after the battery reaches the overcharge limit, so that the limit charge test of the battery can obtain relatively accurate data, and the damage to the charge and discharge equipment and the safety are ensured.
Further, the working condition of the external heat source of the battery can simulate the condition that the external heating exists in the battery. In this embodiment, temperature test data of the same battery with different OCVs under the external heating test can be acquired through the temperature acquisition device, so as to obtain a third test temperature variation curve of thermal runaway along with time change under the external heating condition of at least two groups of batteries under the working condition of the external heat source.
Specifically, at least two groups of batteries with voltages evenly distributed on two sides of the voltage platform may be selected for the external heating test, wherein voltages of two adjacent groups of batteries in the at least two groups of batteries may be separated by a preset voltage value. For example, groups of cells with cell voltages of 3.2V, 3.3V, 3.4V may be selected at intervals of 0.1V, and each group of cells may be subjected to an external heat test separately. According to the temperature test data, a third test temperature change curve corresponding to the 3.2V battery can be obtained, and the third test temperature change curve reflects the change situation of the temperature of the 3.2V battery along with time under the external heating test; a third test temperature change curve corresponding to a 3.3V cell, which reflects the temperature change over time of the 3.3V cell under an external heating test; and a third test temperature profile corresponding to a 3.4V cell, which reflects the temperature of the 3.4V cell as a function of time under an external heat test. It can be referred to table 3 below.
| Numbering | Voltage of battery | Test temperature change curve |
| 1 | 3.2V | Third test temperature Change Curve-1 |
| 2 | 3.3V | Third test temperature Change Curve-2 |
| 3 | 3.4V | Third test temperature Change Curve-3 |
| … | … | … |
| … | … | … |
| … | … | … |
TABLE 3
Furthermore, the conditions of various batteries arranged in the battery pack under an external heat source can be simulated under different arrangement working conditions of the batteries. In this embodiment, the temperature test data of the batteries in the battery pack at various different arrangement positions under the condition of external heating of the battery pack can be collected through the temperature collection device, and a fourth test temperature variation curve of thermal runaway of at least two groups of batteries at different arrangement positions along with time change under different arrangement working conditions of the batteries is obtained.
Specifically, can carry out the heating of external heat source to the battery package, the battery package includes that the multiunit arranges the different battery in position, and in the heating process, can take notes the position of arranging of every group battery to the temperature variation condition of the battery that every position of arranging corresponds and the inside heat distribution condition of battery package are monitored. According to the temperature test data, a plurality of different fourth test temperature change curves of the batteries at different positions in the battery pack can be obtained. For example, an external heat source heating test is performed on the battery pack, and a fourth test temperature change curve of the battery at the first position in the battery pack in the heating process is recorded respectively, which reflects the change of the temperature of the battery at the first position in the battery pack along with the time under the condition that the battery pack is heated by the external heat source; a fourth test temperature change curve of the battery at the second position in the heating process reflects the change of the temperature of the battery at the second position in the battery pack along with the time under the condition that the battery pack is heated by an external heat source; and a fourth test temperature change curve of the battery at the third position in the heating process reflects the change of the temperature of the battery at the third position in the battery pack along with the time under the condition that the battery pack is heated by the external heat source. Reference may be made specifically to table 4 below.
TABLE 4
Step S212: and determining a test temperature reference curve of the battery under each working condition according to at least two groups of test temperature change curves of the battery under each working condition.
In this embodiment, at least two sets of test temperature variation curves of the battery under each working condition can be fitted respectively, and then the test temperature reference curve under each working condition is obtained respectively.
For example, for the battery collision condition, the first test temperature change curves of the batteries with different OCVs can be fitted to obtain a first test temperature reference curve corresponding to the battery collision condition, for example, the first test temperature change curve-1, the first test temperature change curve-2 and the first test temperature change curve-3 are fitted to the first test temperature reference curve of the battery collision condition, and the first test temperature reference curve can reflect the influence of the abuse conditions such as collision and extrusion on the temperature of the battery under thermal runaway. For the battery overcharge condition, fitting a second test temperature change curve of the battery limit overcharge under different charge multiplying factors to further obtain a second test temperature reference curve corresponding to the battery overcharge condition, for example, fitting a second test temperature change curve-1, a second test temperature change curve-2 and a second test temperature change curve-3 into the second test temperature reference curve of the battery overcharge condition, wherein the second test temperature reference curve can reflect the influence of the battery limit overcharge on the battery temperature under thermal runaway. For the working condition of the external heat source of the battery, fitting can be performed on third test temperature change curves of batteries with different OCVs, so as to obtain a third test temperature reference curve corresponding to the working condition of the external heat source, for example, the third test temperature change curve-1, the third test temperature change curve-2 and the third test temperature change curve-3 are fitted into the third test temperature reference curve of the working condition of the external heat source of the battery, and the third test temperature reference curve can reflect the influence on the temperature of the battery under thermal runaway under the condition of the existence of the external heat source. For different arrangement working conditions of the batteries, the fourth test temperature change curves of the batteries at different arrangement positions can be fitted, so that fourth test temperature reference curves corresponding to the different arrangement working conditions of the batteries are obtained, for example, the fourth test temperature change curve-1, the fourth test temperature change curve-2 and the fourth test temperature change curve-3 are fitted into the fourth test temperature reference curves of the batteries at different arrangement working conditions, and the fourth test temperature reference curves can reflect the influence of various arrangement positions and structures in the battery pack on the temperature of the batteries under thermal runaway under the condition of existence of an external heat source.
Step S213: and respectively determining the weight occupied by each working condition.
In this embodiment, the vehicle condition information of the vehicle to which the battery is applied may be acquired, the probability of each operating condition that causes thermal runaway of the battery may be estimated according to the vehicle condition information, and the weight occupied by each operating condition may be determined according to the probability. Specifically, the vehicle condition information may include, but is not limited to, travel path information of the vehicle, traveled mileage information of the vehicle, life information of the battery, aging degree information of the battery, charging frequency information of the battery, and the like. And estimating the probability of each working condition of the battery in all working conditions according to the vehicle condition information if the battery is out of control thermally, and determining the weight of each working condition according to the probability. For example, according to the vehicle condition information, if the vehicle condition information is over a long distance (e.g., 3 kilometers) and the life of the battery is low (e.g., less than 60%), it can be determined according to the vehicle condition information that the battery has a relatively high probability of being in the battery overcharge condition if the battery is in thermal runaway. Further, the corresponding relation between the vehicle condition information and various working condition proportions can be calculated according to a preset calculation formula, and the corresponding relation between the vehicle condition information and various working condition proportions can also be determined by inquiring a corresponding relation table.
For example, under a certain vehicle condition, if the probability of thermal runaway triggered by the battery overcharge condition is the largest, the probability of thermal runaway triggered by the battery collision condition is the second, the probability of thermal runaway triggered by the battery external heat source condition is the third, and the probability of thermal runaway triggered by the battery different arrangement conditions is the smallest, the probability of the battery overcharge condition possibly occurring in the four conditions is 40%, the probability of the battery collision condition possibly occurring in the four conditions is 30%, the probability of the battery external heat source condition possibly occurring in the four conditions is 20%, and the probability of the battery different arrangement conditions possibly occurring in the four conditions is 10%; at this time, it can be determined that the weight of the first test temperature reference curve corresponding to the battery collision working condition is 0.3, the weight of the second test temperature reference curve corresponding to the battery overcharge working condition is 0.4, the weight of the third test temperature reference curve corresponding to the working condition of the external heat source of the battery is 0.2, and the weight of the fourth test temperature reference curve corresponding to the different arrangement working conditions of the battery is 0.1.
In some embodiments, the weight of each operating condition may also be determined according to the occurrence ratio of each operating condition in a plurality of battery thermal runaway cases which occur historically. Specifically, the weight occupied by each working condition can be determined according to the occurrence proportion of each working condition in the multiple battery thermal runaway cases of historical vehicles. For example, in 1000 battery thermal runaway cases which have occurred historically, a crash situation occurs 300 times, a battery overcharge situation occurs 400 times, an external heat source heats the battery 200 times, and an external heat source heats the battery pack 100 times. At this time, the proportion of the corresponding battery collision working condition is 30%, the proportion of the battery overcharge working condition is 40%, the proportion of the battery external heat source working condition is 20%, and the proportion of the battery in different arrangement working conditions is 10%. And then the weight of the first test temperature reference curve corresponding to the battery collision working condition is 0.3, the weight of the second test temperature reference curve corresponding to the battery overcharge working condition is 0.4, the weight of the third test temperature reference curve corresponding to the working condition of a heat source outside the battery is 0.2, and the weight of the fourth test temperature reference curve corresponding to different arrangement working conditions of the battery is 0.1.
It is worth noting that due to frequent charging of the vehicle, extreme overcharge may be the main cause of thermal runaway, and therefore the weight occupied by the second test temperature reference curve corresponding to the battery overcharge condition may be the highest.
Step S214; and fitting the test temperature reference curves corresponding to all the working conditions according to the weight occupied by the working conditions to obtain a thermal runaway temperature early warning curve.
In this embodiment, the test temperature reference curves corresponding to various working conditions can be fitted according to the weights occupied by the various working conditions, and then the thermal runaway temperature early warning curve is obtained.
For example, assuming that the weight occupied by the first test temperature reference curve corresponding to the battery collision working condition is W1, the weight occupied by the second test temperature reference curve corresponding to the battery overcharge working condition is W2, the weight occupied by the third test temperature reference curve corresponding to the battery external heat source working condition is W3, and the weight occupied by the fourth test temperature reference curve corresponding to the different battery arrangement working conditions is W4, the various test temperature reference curves can be fitted to the thermal runaway temperature early warning curve according to the following formula:
the thermal runaway temperature pre-warning curve is (W1 × first test temperature reference curve) + (W2 × second test temperature reference curve) + (W3 × third test temperature reference curve) + (W4 × fourth test temperature reference curve).
Step S230: and if the temperature change accords with a thermal runaway temperature early warning curve and the maximum temperature value in a preset time period is greater than or equal to a preset value, sending out early warning information.
In this embodiment, the step S230 may refer to the step S130 specifically, and is not described again.
The thermal runaway battery thermal runaway detection method provided by the embodiment comprises the steps of obtaining temperature information of a battery, respectively determining test temperature reference curves under various working conditions according to test data of the battery under different working conditions, fitting the test temperature reference curves under various working conditions to determine a thermal runaway temperature early warning curve, determining whether temperature change of the battery in a preset time period accords with the preset thermal runaway temperature curve according to the temperature information, and sending early warning information when the temperature change accords with the thermal runaway temperature early warning curve and the maximum temperature value in the preset time period is greater than or equal to the preset value, so that early warning is carried out on the thermal runaway of the battery in advance, and a user is ensured to have enough escape time. In addition, the battery thermal runaway detection method provided by the embodiment obtains the thermal runaway temperature early warning curve by comprehensively considering the temperature characteristics of the battery thermal runaway under various working conditions, so that the accuracy of the thermal runaway temperature early warning curve is higher, and the accuracy of the battery thermal runaway detection is improved.
As shown in fig. 4, an embodiment of the present application further provides a battery thermal runaway detection apparatus 300, where the battery thermal runaway detection apparatus 300 includes a temperature acquisition module 310, a determination module 320, and an early warning module 330. The temperature obtaining module 310 is configured to obtain temperature information of the battery; the determining module 320 is configured to determine whether a temperature change of the battery within a preset time period meets a preset thermal runaway temperature early warning curve according to the temperature information; the early warning module 330 is configured to send out early warning information if the temperature change conforms to a thermal runaway temperature early warning curve and the maximum temperature value in a preset time period is greater than or equal to a preset value.
In some embodiments, the battery thermal runaway detection apparatus 300 further includes a first curve determination module 340, a second curve determination module 350, a weight determination module 360, and a fitting module 370. The first curve determining module 340 is configured to determine at least two groups of test temperature variation curves of the battery under each working condition according to test data of the battery under various working conditions; the second curve determining module 350 is configured to determine a test temperature reference curve of the battery under each working condition according to at least two groups of test temperature variation curves of the battery under the working condition; the weight determination module 360 is configured to determine the weight occupied by each working condition; the fitting module 370 is configured to fit the test temperature reference curves corresponding to all the operating conditions according to the weight occupied by each operating condition to obtain a thermal runaway temperature early warning curve.
The battery thermal runaway detection device provided by the embodiment of the application acquires the temperature information of the battery; determining whether the temperature change of the battery in a preset time period accords with a preset thermal runaway temperature early warning curve or not according to the temperature information; and finally, when the temperature change accords with the thermal runaway temperature early warning curve within a preset time period and the maximum temperature value within the preset time period is greater than or equal to a preset value, sending early warning information so as to early warn the thermal runaway of the battery in advance and ensure that a user has enough escape time.
As shown in fig. 5, an embodiment of the present invention further provides a battery management system 400, where the battery management system 400 includes a processor 410 and a memory 420, where the memory 420 stores computer program instructions, and the computer program instructions are invoked by the processor 410 to execute the battery thermal runaway detection method 100 or the battery thermal runaway detection method 200.
The Memory 420 may include a Random Access Memory (RAM) 420 or a Read-Only Memory (Read-Only Memory) 420. The memory 420 may be used to store instructions, programs, code, sets of codes, or sets of instructions. The memory 420 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing various method embodiments described below, and the like. The storage data area can also store data (such as a phone book, audio and video data, chatting record data) created by the electronic device map in use and the like.
As shown in fig. 6, an embodiment of the present application further provides a vehicle 500, where the vehicle 500 includes a vehicle body 510, a battery 520, and the battery management system 400, where the battery management system 400 is disposed in the vehicle body 510, and the battery management system 400 is electrically connected to the battery 520.
In this embodiment, the battery 520 may include, but is not limited to, any one of a single power battery, a power battery module, and a power battery pack.
As shown in fig. 7, an embodiment of the present application further provides a computer-readable storage medium 600, in which a computer program instruction 610 is stored in the computer-readable storage medium 600, and the computer program instruction 610 can be called by a processor to execute the method described in the above embodiment.
The computer-readable storage medium may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read only memory), an EPROM, a hard disk, or a ROM. Alternatively, the computer-readable storage medium includes a non-volatile computer-readable storage medium. The computer-readable storage medium 600 has storage space for program code for performing any of the method steps described above. The program code can be read from or written to one or more computer program products. The program code may be compressed, for example, in a suitable form.
Although the present application has been described with reference to the preferred embodiments, it is to be understood that the present application is not limited to the disclosed embodiments, but rather, the present application is intended to cover various modifications, equivalents and alternatives falling within the spirit and scope of the present application.
Claims (10)
1. A battery thermal runaway detection method is characterized by comprising the following steps:
acquiring temperature information of a battery;
determining whether the temperature change of the battery in a preset time period accords with a preset thermal runaway temperature early warning curve or not according to the temperature information; and
and if the temperature change accords with the thermal runaway temperature early warning curve and the maximum temperature value in the preset time period is greater than or equal to a preset value, sending out early warning information.
2. The battery thermal runaway detection method of claim 1, wherein the thermal runaway temperature early warning curve is obtained from test temperature reference curves of the battery under at least two different operating conditions; the at least two different working conditions comprise at least two combinations of a battery collision working condition, a battery overcharge working condition, a battery external heat source working condition and different battery arrangement working conditions.
3. The battery thermal runaway detection method of claim 2, wherein the thermal runaway temperature early warning curve is obtained from a test temperature reference curve of the battery under at least two different operating conditions, and the method comprises:
respectively determining the test temperature reference curves under various working conditions according to the test data of the battery under different working conditions; and
and fitting the test temperature reference curves corresponding to all the working conditions to obtain the thermal runaway temperature early warning curve.
4. The method for detecting the thermal runaway of the battery according to claim 3, wherein the determining the test temperature reference curves under various working conditions respectively according to the test data of the battery under the different working conditions comprises:
determining at least two groups of test temperature change curves of the battery under each working condition according to the test data of the battery under various working conditions; and
and determining the test temperature reference curve of the battery under each working condition according to the at least two groups of test temperature change curves of the battery under each working condition.
5. The battery thermal runaway detection method of claim 3, wherein fitting the test temperature reference curves corresponding to all the operating conditions to obtain the thermal runaway temperature early warning curve comprises:
respectively determining the weight occupied by each working condition; and
and fitting the test temperature reference curves corresponding to all the working conditions according to the weight occupied by the working conditions to obtain the thermal runaway temperature early warning curve.
6. The method for detecting thermal runaway of a battery as claimed in claim 5, wherein the separately determining the weight occupied by each operating condition comprises:
acquiring vehicle condition information of a vehicle to which the battery is applied;
estimating the probability of each working condition causing the thermal runaway of the battery according to the vehicle condition information; and
and determining the weight occupied by each working condition according to the probability.
7. A battery thermal runaway detection device, comprising:
the temperature acquisition module is used for acquiring temperature information of the battery;
the determining module is used for determining whether the temperature change of the battery in a preset time period accords with a preset thermal runaway temperature early warning curve or not according to the temperature information; and
and the early warning module is used for sending out early warning information if the temperature change accords with the thermal runaway temperature early warning curve and the maximum temperature value in the preset time period is greater than or equal to a preset value.
8. A battery management system comprising a processor and a memory, the memory storing computer program instructions which, when invoked by the processor, perform the battery thermal runaway detection method of any of claims 1-6.
9. A vehicle comprising a vehicle body, a battery, and the battery management system of claim 8 disposed in the vehicle body, the battery management system being electrically connected to the battery.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a program code, wherein the program code when executed by a processor performs the method of any of claims 1-6.
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