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CN113787914A - Power battery monitoring method and device, server and storage medium - Google Patents

Power battery monitoring method and device, server and storage medium Download PDF

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Publication number
CN113787914A
CN113787914A CN202111211639.0A CN202111211639A CN113787914A CN 113787914 A CN113787914 A CN 113787914A CN 202111211639 A CN202111211639 A CN 202111211639A CN 113787914 A CN113787914 A CN 113787914A
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Prior art keywords
power battery
temperature
parameters
monitoring
threshold
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Granted
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CN202111211639.0A
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CN113787914B (en
Inventor
曹海涛
王杭挺
蔡潘
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Guangzhou Xiaopeng Motors Technology Co Ltd
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Guangzhou Xiaopeng Motors Technology Co Ltd
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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
    • 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
    • B60L58/16—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • 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
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles
    • Y02T90/167—Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S30/00—Systems supporting specific end-user applications in the sector of transportation
    • Y04S30/10—Systems supporting the interoperability of electric or hybrid vehicles
    • Y04S30/12—Remote or cooperative charging

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application discloses a monitoring method and device of a power battery, a server and a storage medium. The method comprises the following steps: acquiring a charging parameter and a temperature parameter of at least one power battery; determining monitoring parameters according to the charging parameters and the temperature parameters; the monitoring parameter is at least used for representing the temperature rise rate of the power battery; and determining the health state of the power battery based on the monitoring parameters, wherein the health state represents the fault degree of the power battery. According to the technical scheme, the working state of the working battery can be determined based on the monitoring parameters, for example, the working battery is in a state to be repaired and a state to be observed, and the power battery is monitored so as to check and maintain the power battery in time and guarantee the use safety of the power battery.

Description

Power battery monitoring method and device, server and storage medium
Technical Field
The present disclosure relates to the field of power battery technologies, and in particular, to a method and an apparatus for monitoring a power battery, a server, and a storage medium.
Background
The power battery is a power source of the electric vehicle, and the working performance of the power battery has great influence on the driving mileage of the vehicle. Therefore, monitoring of the power cell is necessary.
In the related art, the power battery is monitored in the following manner: before the electric vehicle is on the market, the electric vehicle is subjected to a charge-discharge experiment, and whether the power battery is subjected to the cold joint or not can be detected.
In the related art, the power battery of the sold electric vehicle cannot be monitored.
Disclosure of Invention
The application provides a monitoring method and device for a power battery, a server and a storage medium.
In a first aspect, the present application provides a method for monitoring a power battery, including: acquiring charging parameters and temperature parameters of at least one power battery, wherein the charging parameters comprise charging current of the power battery in a charging process, and the temperature parameters comprise: the temperature of the power battery in the charging process or/and the ambient temperature of the power battery; determining monitoring parameters according to the charging parameters; the monitoring parameter is at least used for representing the temperature rise rate of the power battery; and determining the health state of the power battery based on the monitoring parameters, wherein the health state represents the fault degree of the power battery.
In some examples, determining the monitoring parameter as a function of the charging parameter and the temperature parameter includes: acquiring a starting temperature and an ending temperature of the power battery in the charging process based on the temperature parameters; acquiring a ratio of a difference value between the starting temperature and the ending temperature to the charging time as a temperature rise rate of the power battery, and determining the temperature rise rate of the power battery as a monitoring parameter; or acquiring the charging current of the power battery in the charging process based on the charging parameters, and acquiring the starting temperature and the ending temperature of the power battery in the charging process based on the temperature parameters; determining the ratio of the difference between the starting temperature and the ending temperature to the charging time as the temperature rise rate of the power battery; the ratio between the rate of temperature rise and the charging current is determined as a monitoring parameter. And providing data support for the subsequent determination of the working state of the power battery by providing a determination mode of the monitoring parameters.
In some examples, determining the state of health of the power cell based on the monitored parameter includes: when the monitoring parameter is larger than a first threshold value, determining that the power battery is in a first state, wherein the first state is used for representing that the power battery is in a critical state of failure; when the monitoring parameter is larger than a second threshold and smaller than a first threshold, monitoring and determining that the power battery is in a second state, wherein the second state is used for representing that the power battery is between a critical state and a normal state of a fault; and when the monitoring parameter is smaller than a second threshold value, determining that the power battery is in a normal state. The working state of the power battery is divided according to the first threshold and the second threshold, so that the monitoring of the working state of the power battery is realized.
In some examples, before determining the state of health of the power battery based on the monitored parameter, the method further includes: acquiring working parameters of the power battery, wherein the working parameters comprise at least one of the following: the battery type of the power battery, the ambient temperature of the power battery and the mileage interval of the vehicle in which the power battery is positioned; the first threshold and the second threshold are determined based on an operating parameter of the power cell. The corresponding first threshold value and the second threshold value are formulated according to the working parameters of the power battery, so that the subsequent determination process of the working state of the power battery is more consistent with the actual situation and more accurate.
In some examples, determining the first threshold and the second threshold based on an operating parameter of the power cell includes: acquiring a fault threshold corresponding to working parameters of the power battery, wherein the fault threshold is the minimum monitoring parameter of vehicles with the same working parameters of the power battery when the vehicles have faults, and the first threshold is smaller than the fault threshold; the first threshold and the second threshold are determined based on a fault threshold. The first threshold value and the second threshold value are determined according to the minimum monitoring parameter of the vehicle with the same working parameter of the power battery when the vehicle fails, so that the determination of the first threshold value and the second threshold value is more consistent with the actual condition of the vehicle and more reasonable.
In some examples, determining the first threshold and the second threshold based on an operating parameter of the power cell includes: acquiring distribution information of monitoring parameters of at least one other power battery corresponding to the working parameters of the power battery, wherein the distribution information is used for representing a distribution interval of numerical values of the monitoring parameters of the other power batteries with the same working parameters of the power battery; determining the minimum value of the monitoring parameters with the proportion smaller than a first preset proportion as a first threshold value based on the distribution information; determining the minimum value of the monitoring parameters with the occupation ratio smaller than a second preset ratio as a second threshold value based on the distribution information; the first preset proportion is smaller than the second preset proportion. The first threshold value and the second threshold value are determined according to the distribution information of the monitoring parameters of a plurality of vehicles with the same working parameters of the power battery, so that the determination of the first threshold value and the second threshold value is more consistent with the actual condition of the vehicles and more reasonable.
In some examples, the method further comprises: under the condition that the working state of the power battery is determined to be the first state, sending repair reminding information to associated equipment of the vehicle, wherein the repair reminding information is used for reminding the vehicle to return to a factory for repair; the association equipment comprises an interaction device of the vehicle or external electronic equipment in communication connection with the vehicle; and in the case that the working state of the power battery is determined to be the second state, marking the vehicle as the vehicle to be observed. By providing a solution for providing the working state of the power battery, the use safety of the power battery is improved.
In a second aspect, the present application also provides a monitoring device for a power battery, the device including: the first acquisition module is used for acquiring the charging parameters and the temperature parameters of at least one power battery, wherein the charging parameters comprise the charging current of the power battery in the charging process, and the temperature parameters comprise: the temperature of the power battery in the charging process or/and the ambient temperature of the power battery; the second acquisition module is used for determining monitoring parameters according to the charging parameters and the temperature parameters; the monitoring parameter is at least used for representing the temperature rise rate of the power battery; and the state determination module is used for determining the health state of the power battery based on the monitoring parameters, and the health state represents the fault degree of the power battery.
In a third aspect, the present application further provides a server, where the server 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 monitoring method for the power battery.
In a fourth aspect, the present application further provides a computer-readable storage medium storing program codes, wherein the monitoring method of the power battery is executed when the program codes are executed by a processor.
In a fifth aspect, the present application further provides a computer program product, which when executed, implements the monitoring method for a power battery described above.
The application provides a monitoring method, a monitoring device, a server and a storage medium of a power battery, wherein the monitoring parameters are determined based on charging parameters and temperature parameters after the charging parameters and the temperature parameters of the power battery of a vehicle in the charging process are collected, and the monitoring parameters can reflect the temperature change condition of the power battery in the charging process or the temperature change condition under different charging currents; because the power battery can lead to the phenomenon that the temperature rises too fast in the charging process under different working conditions, namely the temperature rise rate of the power battery is too large, the working state of the power battery can be determined based on the monitoring parameters, for example, the power battery is in a state to be repaired (close to a fault state) and a state to be observed (exceeding a normal state but not close to the fault state), the monitoring of the power battery is realized, so that the power battery can be checked and maintained in time, and the use safety of the power battery is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the present application, the drawings that are needed to be used in the description of the examples are briefly introduced below, it is obvious that the drawings in the following description are only some examples of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic diagram of an implementation environment of a monitoring method for a power battery according to an example of the present application.
Fig. 2 is a flowchart of a monitoring method for a power battery according to an example of the present application.
FIG. 3 is a schematic illustration of temperature parameters of a vehicle provided by one example of the present application.
Fig. 4 is a schematic interface diagram of a rework reminder message provided by an example of the present application.
Fig. 5 is a graph illustrating temperature rise rates at different starting temperatures and different charging currents provided by an example of the present application.
Fig. 6 is a block diagram of a monitoring device for a power battery according to an example of the present application.
Fig. 7 is a block diagram of a server according to an example of the present application.
FIG. 8 is a block diagram of a computer-readable storage medium provided by one example 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.
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the examples of the present application will be clearly and completely described below with reference to the drawings in the present application. It is obvious that the described examples are only a part of the present application, and not all examples. All other examples, which can be obtained by a person skilled in the art without making any creative effort based on the examples in the present application, belong to the protection scope of the present application.
As shown in fig. 1, an implementation environment of the monitoring method for a power battery according to the present example is provided. The implementation environment includes: the server 10 is associated with at least one vehicle 11, an associated device 12 of each vehicle 11.
The server 10 may be one server, multiple servers, or one cloud computing service center. In this example, the server 10 is configured to obtain a charging parameter and a temperature parameter of the power battery sent by each vehicle 11, perform statistical analysis on the charging parameter and the temperature parameter to obtain a monitoring parameter of the power battery of different vehicles 11, and provide a corresponding processing measure for the power battery of the vehicle 11 based on the monitoring parameter.
In some examples, the server 10 is a cluster architecture. Optionally, the server 10 includes a data storage server and a statistical analysis server. The data storage server is used for storing the charging parameters and the temperature parameters reported by the associated devices 12 of each vehicle 11, and is also called as a large data platform of the power battery assembly. The statistical analysis server is configured to perform statistical analysis on the charging parameters and the temperature parameters to obtain monitoring parameters of the power batteries of different vehicles 11, and further provide corresponding processing measures for the power batteries of the vehicles 11 based on the monitoring parameters.
The monitoring parameter refers to a temperature rise rate of the power battery in a charging process, or a ratio of the temperature rise rate to a charging current. Because power battery all can appear power battery at different operating modes under the power battery and the phenomenon too fast that the temperature rises in the charging process, and too high temperature also can influence power battery's working property, and then leads to power battery's life-span to reduce, above-mentioned different operating modes include and are not limited to: the internal wiring of the vehicle 11 is aged, the contact internal resistance is increased, and the like. For the above reasons, the server 10 obtains the monitoring parameters and monitors the operation performance of the power battery through the monitoring parameters.
The peripheral side of the power battery of the vehicle 11 is provided with a temperature sensor for collecting temperature information during charging of the power battery of the vehicle. In some examples, the temperature sensor includes a first temperature sensor for acquiring an ambient temperature of the power battery and a second temperature sensor for acquiring a surface temperature or an internal temperature of the power battery during charging. The number of the first temperature sensors may be one or more. In the case that a plurality of first temperature sensors are arranged, the first temperature sensors are distributed on the peripheral side of the power battery, and the average value of the temperature information collected by each first temperature sensor is determined as the ambient temperature of the power battery, so that the collected ambient temperature is more accurate. The number of the second temperature sensors may be one or more. In the case that a plurality of second temperature sensors are arranged, the second temperature sensors are distributed on the surface or inside of the power battery, and the average value of the temperature information collected by each second temperature sensor is determined as the surface temperature or the inside temperature of the power battery, so that the collected surface temperature or the collected inside temperature of the power battery is more accurate.
The associated device 12 of the vehicle 11 may be provided on the vehicle 11, such as a center console, a control center provided in the vehicle 11. The associated device 12 of the vehicle 11 may also be an external electronic device communicatively connected with the vehicle, and the external electronic device may be an electronic device installed with a control application program of the vehicle, such as a mobile terminal like a mobile phone, a tablet computer, and the like. The associated device 12 of the vehicle 11 is capable of collecting the charging parameters and the temperature parameters of the power battery of the vehicle 11 and reporting them to the server 10. In the present example, the associated device 12 of the vehicle 11 reports to the server 10 the charging parameters and the temperature parameters, such as the current of the vehicle during charging, the temperature of the vehicle during charging, the ambient temperature of the power battery, and so on. Optionally, the associated device 12 of the vehicle 11 also reports information about the type of power battery, the manufacturer of the vehicle, etc. to the server 10. In some examples, the association device 121 of the vehicle 11 reports the charging and discharging information to the server 10 periodically, and the reporting period may be set by the server 10 or the association device 12 of the vehicle 11 by default, such as 3 days, one week, one month, and the like. In other examples, the associated device 12 of the vehicle 11 reports the charging parameters and the temperature parameters after each charge of the vehicle is completed.
The server 10 and the associated device 12 of the vehicle 11 establish a communication connection through a wired network or a wireless network. In some examples, when the server 10 is a cluster architecture, the associated device 12 of the vehicle 11 establishes a communication connection with each server 10 (such as a data storage server, a statistical analysis server), or with any server in the cluster architecture through a wired network or a wireless network.
As shown in fig. 2, the present application provides a method for monitoring a power battery, which is applied to the server in the example shown in fig. 1, and includes:
step 201, acquiring a charging parameter and a temperature parameter of at least one power battery.
The charging parameters comprise the charging current of the power battery in the charging process. Optionally, the charging parameter comprises a relation between a charging current and time of the power battery during charging.
The temperature parameters include: the temperature of the power battery in the charging process, or/and the ambient temperature of the power battery. The temperature of the power battery during the charging process may be an internal temperature of the power battery during the charging process, a surface temperature of the power battery during the charging process, or a temperature determined based on the internal temperature and the surface temperature (such as an average value of the internal temperature and the surface temperature). Optionally, the temperature parameter comprises a relationship between temperature and time of the power battery during charging. The ambient temperature of the power cell is the temperature of the environment in which the power cell is located. Alternatively, the ambient temperature refers to the ambient temperature of the power battery before the start of charging.
Referring collectively to FIG. 3, a schematic diagram of temperature parameters of a vehicle provided by one embodiment of the present application is shown. Three temperature sampling points, namely a sampling point 1, a sampling point 2 and a sampling point 3, are arranged on the peripheral side of a power battery of the vehicle, and the temperatures collected by the three temperature sampling points are shown in figure 3.
In some examples, the server receives the charging parameters and the temperature parameters reported by the associated devices of the respective vehicles. In some possible implementations, the server receives the charging parameter and the temperature parameter reported by an interactive device of the vehicle (such as a control device disposed inside the vehicle). Optionally, the interactive device of the vehicle acquires a charging parameter and a temperature parameter of the vehicle, and reports the charging parameter and the temperature parameter periodically. Optionally, the charging parameter and the temperature parameter are reported to the server by the vehicle interaction device after the triggering instruction is acquired. The interaction device of the vehicle acquires the trigger instruction after acquiring the reporting instruction triggered by the user, or acquires the trigger instruction after the vehicle finishes charging. In other possible implementation manners, the server receives the charging parameter and the temperature parameter reported by the intelligent device in communication connection with the vehicle.
In other examples, the server obtains the charging parameters and the temperature parameters from a big data platform of the power battery assembly. In this example, the server acquires the above-described charging parameter and temperature parameter every predetermined period. The predetermined period is set by default by the server or the associated device of the vehicle, such as one week, one month, etc. The process of acquiring the charging parameters and the temperature parameters by the big data platform of the assembly can refer to the manner of acquiring the charging parameters and the temperature parameters by the server, which is not described herein again.
Optionally, the server also obtains information such as the type of the power battery of the vehicle, the driving range of the vehicle, and the like. The associated equipment of the vehicle reports the information to the server so that the server can know more information of the power battery and give auxiliary support for determining the working state of the power battery.
And 202, acquiring monitoring parameters of the power battery according to the charging parameters and the temperature parameters.
The monitoring parameter is at least used for characterizing the temperature rise rate of the power battery. In some examples, the monitored parameter is also the rate of temperature rise of the power cell. In other examples, the monitored parameter is calculated based on a rate of temperature rise of the power cell and the charging current. Optionally, the monitored parameter is a ratio between a rate of temperature rise of the power cell and a charging current.
When the battery is in different working conditions, the phenomenon that the temperature rising rate is too fast can occur in the charging process. In addition, the temperature rise rate is also affected by the charging current. On the basis, the server designs monitoring parameters, judges the working performance of the power battery through the monitoring parameters, and generates treatment measures for the power battery based on the monitoring parameters.
In some examples, the monitored parameter includes a ratio between a rate of temperature rise and a charging current used to characterize the power cell. In this example, step 202 is implemented as:
step 202a, acquiring a charging current of the power battery in a charging process based on the charging parameters.
And the server reads the charging current from the charging parameters reported by the associated equipment of the vehicle. The rising charging current may be the average current of the power cell during charging.
And step 202b, acquiring a starting temperature and an ending temperature of the power battery in the charging process based on the temperature parameters.
The starting temperature refers to the temperature of the power battery at the start of charging. The end temperature is the temperature of the power battery at the end of charging. And the server reads the starting temperature and the ending temperature from the temperature parameters reported by the associated equipment of the vehicle.
In some examples, after the server obtains the starting temperature and the ending temperature, it is determined whether the ending temperature is greater than a first preset value, if the ending temperature is greater than the first preset value, the subsequent steps are executed, and if the ending temperature is less than the first preset value, it is determined that the temperature rise condition of the power battery in the charging process is reasonable, and the subsequent determination of the monitoring parameters of the power battery is not needed.
And step 202c, determining the ratio of the difference between the starting temperature and the ending temperature to the charging time as the temperature rise rate of the power battery.
Alternatively, the rate of temperature rise of the power battery is expressed by the following equation:
Figure BDA0003309159550000071
v represents the rate of temperature rise, TendIndicates the end temperature, TstartDenotes the starting temperature, and t denotes the charging period.
In some examples, the server determines whether the temperature rise rate is greater than a second preset value after the temperature rise rate of the power battery, if the temperature rise rate is greater than the second preset value, the subsequent steps are executed, and if the temperature rise rate is less than the second preset value, the power battery is considered to be in a fast charging state, the temperature rise condition of the power battery in the charging process is reasonable, and subsequent determination of the monitoring parameters of the power battery is not needed.
In step 202d, the ratio between the temperature rise rate and the charging current is determined as a monitoring parameter.
Optionally, the monitoring parameter is expressed by the following formula:
Figure BDA0003309159550000081
x represents the monitored parameter, v represents the rate of temperature rise, and I represents the charging current.
In other examples, the monitored parameter is used to characterize a rate of temperature rise of the power cell. In this example, step 202 is implemented as:
and step 202e, acquiring a starting temperature and an ending temperature of the power battery in the charging process based on the temperature parameters.
And step 202f, acquiring the ratio of the difference between the starting temperature and the ending temperature to the charging time as the temperature rise rate of the power battery.
And step 202g, determining the temperature rise rate of the power battery as a monitoring parameter.
The calculation process of the temperature rise rate of the power battery can refer to the above steps 202a-202c, which is not described herein. In some examples, the server also obtains a charge duration of the power battery before determining the monitoring parameter. If the charging time is longer than a third preset value, executing the subsequent step of acquiring the monitoring parameters; if the charging time is shorter than the third preset value, the charging time of the power battery is too short, and the temperature parameter and the charging parameter obtained in the charging process do not have reference values, so that the step of obtaining the monitoring parameter is not executed.
And step 203, determining the health state of the power battery based on the monitoring parameters.
The state of health of the power battery characterizes the degree of failure of the power battery. The monitoring parameters and the fault degree of the power battery are in positive correlation. That is, the larger the monitoring parameter is, the larger the fault degree of the power battery is; the smaller the monitoring parameter, the smaller the degree of failure of the power battery.
If the monitoring parameter is larger than a first threshold value, determining that the power battery is in a first state, wherein the first state is a critical state of a fault, namely the power battery is about to break down; if the monitoring parameter is larger than a second threshold value and smaller than a first threshold value, determining that the power battery state is in a second state, wherein the second state is a state between a critical state and a normal state of a fault; and if the monitoring parameter is smaller than a second threshold value, determining that the power battery is in a normal state, wherein the first threshold value is larger than the second threshold value.
The first threshold and the second threshold are determined by the server in combination with the operating parameters of the power battery, or are set by the relevant technicians in a self-defined manner. In some examples, the first threshold and the second threshold are determined according to distribution conditions of monitoring parameters corresponding to the working parameters of the power battery. In other examples, the first threshold and the second threshold are determined according to a fault threshold corresponding to an operating parameter of the power battery, and the fault threshold is used for representing a minimum monitoring parameter of the power battery when the power battery is in fault. The above two determination processes will be explained in the following examples.
The operating parameters of the power cell include one or more of the following in combination: the battery type of the power battery, the ambient temperature of the power battery, and the mileage interval of the vehicle in which the power battery is located. The three working parameters all affect the charging parameters and the temperature change conditions of the power battery in the charging process, so that corresponding threshold values are necessary to be set for different types, different environmental temperatures and different mileage intervals, so that the determining process of the working state of the power battery is more in line with the actual conditions of the power battery of the type, and the determining of the working state of the power battery is more accurate. Referring collectively to fig. 4, a graph illustrating temperature rise rates at different ambient temperatures and different charging currents is shown.
In some examples, in the event that the operating state of the power battery is determined to be a critical state of failure, a rework reminder message is sent to an associated device of the vehicle. The associated equipment of the vehicle comprises an interactive device of the vehicle and external electronic equipment in communication connection with the vehicle. The repair reminding information is used for reminding the vehicle to return to the factory for repair. In some examples, the rework alert includes monitored parameters of the power cell, and the power cell is in a critical state of failure. Optionally, the repair reminding information may further include a working condition of the power battery, that is, a reason why the power battery is in a critical state of the fault. The working conditions of the power battery include and are not limited to: line aging conditions, contact internal resistance increasing conditions and the like. In this example, before sending the repair reminding information, the server determines the working condition of the power battery based on the monitoring parameters. Optionally, the server tests a corresponding relationship between the operating condition of the power battery and the monitoring parameter in a laboratory environment, and then searches the corresponding relationship to determine the operating condition of the power battery.
The associated equipment of the vehicle displays the repair reminding information, so that the vehicle owner can know the condition that the power battery of the vehicle is in the critical state of the fault in time. The mode of showing the repair reminding information comprises the following steps: voice prompt mode, display mode, etc. Further, when the repair reminding information includes the working condition of the power battery, the owner can also know the reason that the power battery of the vehicle is in the critical state of the fault. With reference to fig. 5, a schematic interface diagram of the rework reminder information provided by an embodiment of the application is shown. The associated device 51 of the vehicle displays the rework prompting message 52 "the power battery of the vehicle is about to fail, please repair in time".
In some examples, the server further receives a repair instruction transmitted by the associated device of the vehicle, transmits location information of a repair shop to the associated device of the vehicle based on the repair instruction, and the subsequent vehicle may acquire a travel path of the vehicle to the repair shop based on the map-based application.
When the repair instruction is the first repair instruction, the server determines the location information of the repair shop based on the location information of the vehicle currently located, such as obtaining the location information of the repair shop closest to the location of the vehicle currently located. The first repair order is used to indicate that the vehicle is being serviced immediately. Optionally, the associated device of the vehicle further displays a first control, and receives a first repair instruction if a trigger signal corresponding to the first control is received. Referring to fig. 5, the associated equipment of the vehicle also displays a first control 53 "immediate processing". In some examples, the associated device of the vehicle also displays a second control 54 "post-processing for a period of time" and a third control 55 "ignore". After receiving the trigger signal corresponding to the second control 54, the associated device of the vehicle cancels the display of the repair notice information, and redisplays the repair notice information after a preset period of time. After the associated device of the vehicle receives the trigger signal corresponding to the third control 55, the display of the rework prompting message is cancelled.
And the monitoring parameter is larger than the second threshold and smaller than the first threshold, and is used for representing that the monitoring parameter of the power battery is far beyond the normal state but does not reach the fault state, and at the moment, the vehicle is brought into an observation area.
In some examples, when the operating state of the power battery is determined to be the second state, that is, the monitoring parameter of the power battery is far beyond the normal state, but does not reach the state of the fault state, the server marks the vehicle as a vehicle to be observed, continuously observes the temperature change condition of the vehicle in the subsequent charging process, and finds whether the power battery fails or not.
According to the monitoring method of the power battery, the charging parameters and the temperature parameters of the power battery of the vehicle in the charging process are collected, and then the monitoring parameters are determined based on the charging parameters and the temperature parameters, wherein the monitoring parameters can reflect the temperature change condition of the power battery in the charging process or the temperature change condition under different charging currents; because the power battery can lead to the phenomenon that the temperature rises too fast in the charging process under different working conditions, namely the temperature rise rate of the power battery is too large, the working state of the power battery can be determined based on the monitoring parameters, for example, the power battery is in a state to be repaired (close to a fault state) and a state to be observed (exceeding a normal state but not close to the fault state), the monitoring of the power battery is realized, so that the power battery can be checked and maintained in time, and the use safety of the power battery is guaranteed.
The determination process of the first threshold value and the second threshold value is explained below. In an alternative embodiment provided based on the embodiment shown in fig. 2, before step 203, the method further comprises the steps of:
and 301, acquiring working parameters of the power battery.
The operating parameters of the power cell include at least one of: the battery type of the power battery, the ambient temperature of the power battery, and the mileage interval of the vehicle in which the power battery is located.
In some examples, the ambient temperature of the power battery is carried in temperature parameters reported by the associated device of the vehicle. The mileage interval of the vehicle where the power battery is located may be reported together when the associated device of the vehicle reports the temperature parameter and the charging parameter. The battery type of the power battery can be reported by the associated equipment of the vehicle when reporting the temperature parameter and the charging parameter, or can be obtained by the server through query from an assembly big data platform.
Step 302, determining a first threshold and a second threshold based on the operating parameters of the power battery.
Because the battery type of the power battery, the ambient temperature of the power battery, and the mileage interval of the vehicle in which the power battery is located all affect the charging parameters and temperature variation conditions during the charging process of the power battery, it is necessary to set corresponding thresholds for different types, different ambient temperatures, and different mileage intervals, so that the determination process of the working state of the power battery is more in line with the actual conditions of the power battery of the type, and the determination of the working state of the power battery is more accurate.
In some examples, the server determines the first threshold and the second threshold based on a battery type of the power battery. In some examples, the server determines the first threshold and the second threshold based on an ambient temperature of the power cell. In some examples, the server determines the first threshold and the second threshold based on a range interval of a vehicle in which the power battery is located.
In some examples, the server determines the first and second thresholds based on a battery type of the power battery and an ambient temperature. In some examples, the server determines the first threshold and the second threshold based on a battery type of the power battery and a range of the vehicle in which the server is located. In some examples, the server determines the first threshold and the second threshold based on an ambient temperature of the power battery and a range of the vehicle in which the server is located.
In some examples, the server determines the first and second thresholds based on a battery type of the power battery, an ambient temperature, and a range of the vehicle in which the server is located.
The determination process of the first threshold and the second threshold is explained below by taking the example that the operating parameter of the power battery includes the battery type. In one possible implementation, the process includes the steps of:
step 401, acquiring a fault threshold corresponding to the battery type of the power battery.
The failure threshold value refers to the minimum monitoring parameter of the vehicles with the same operating parameters of the power battery when the vehicle fails. In some examples, the failure threshold is detected by the server for vehicles that have the same battery type and that have failed, which may be referred to as a target type for the power battery of the failed vehicle.
In this example, the failure thresholds corresponding to the power batteries of different battery types are not the same, and therefore the server needs to obtain the failure threshold corresponding to the target type to determine the first threshold and the second threshold corresponding to the power battery of the target type respectively.
Step 402, determining a first threshold and a second threshold based on the failure threshold.
The fault threshold is greater than the first threshold. And the server subtracts the first difference value from the fault threshold value corresponding to the power battery of the target type to obtain a first threshold value corresponding to the target type, and subtracts the second difference value from the fault threshold value corresponding to the target type to obtain a second threshold value corresponding to the target type. The first difference and the second difference are set experimentally or empirically, the first difference being less than the second difference.
Illustratively, if the failure threshold of the power battery with the battery type a is 8, the first difference is 2, and the second difference is 4, the first threshold is 6, and the second threshold is 4.
In another possible implementation, the process includes the steps of:
and step 403, acquiring distribution information of monitoring parameters of a plurality of other power batteries corresponding to the battery types of the power batteries.
The distribution information of the monitoring parameters is used for representing the distribution interval of the values of the monitoring parameters of other power batteries with the same working parameters of the power batteries. The monitoring parameters of the other power batteries can be reported to the server by the associated equipment of the vehicle provided with the other power batteries, or can be acquired by the server from the assembly big data platform. In some examples, the battery type of the power battery corresponds to a normal distribution of the monitored parameters of a plurality of other power batteries. Table-1 below illustrates one type of distribution information.
Temperature rise Rate (. degree. C./min) Number of vehicles Ratio of occupation of Partitioning
2 30 42.86％ B3
3 22 31.43％ B2
4 13 18.57％ B1
6 5 7.17％ A
TABLE-1
In some examples, after acquiring the distribution information of the monitoring parameters of the plurality of power batteries, the server classifies the power batteries according to the types of the power batteries to obtain the distribution information of the monitoring parameters of other power batteries with the same type as the power battery in step 201. The type of the power battery can be reported by a control center or associated equipment of the vehicle when reporting the charging parameter and the temperature parameter, or can be obtained by a server according to the query of the vehicle model.
And step 404, determining the minimum value of the monitoring parameter with the proportion smaller than the first preset proportion as a first threshold value based on the distribution information.
The first predetermined ratio is set experimentally or empirically.
In some examples, the server determines, as the first threshold, a minimum value of the monitoring parameters having a proportion smaller than a first preset proportion, based on the distribution information of the monitoring parameters of the type of power battery.
Illustratively, the first predetermined proportion is 10%. For example, if the monitoring parameters of the plurality of power batteries, which account for more than 10%, are greater than 6, the first threshold value is 6.
Step 405, based on the distribution information, determining a minimum value of the monitoring parameter with the proportion smaller than a second preset proportion as a second threshold value.
The first preset proportion is smaller than the second preset proportion. The second predetermined ratio is set experimentally or empirically. In some examples, the server determines, as the second threshold, a minimum value of the monitoring parameters having a proportion smaller than a second preset proportion, based on the distribution information of the monitoring parameters of the type of power battery.
Illustratively, the second predetermined proportion is 30%. For example, if the monitoring parameter of the plurality of power batteries, which accounts for more than 30%, is greater than 4, the second threshold value is 4.
The determination process of the first threshold and the second threshold is explained below by taking the working parameters of the power battery including the battery type and the ambient temperature as an example.
In one possible implementation, the process includes the steps of:
and step 406, acquiring a fault threshold corresponding to the battery type and the ambient temperature of the power battery.
In some examples, the failure threshold is detected by the server for vehicles that have the same battery type and the same ambient temperature and that have failed, the battery type of the power battery of the failed vehicle may be referred to as a target type, and the ambient temperature of the power battery of the failed vehicle may be referred to as a target temperature.
In this example, the fault thresholds corresponding to the power batteries of different battery types are different, and the fault thresholds corresponding to the power batteries of different environmental temperatures are also different, so the server needs to obtain the fault thresholds corresponding to the target type and the target temperature to determine the first threshold and the second threshold corresponding to the power battery with the target type and the environmental temperature as the target temperature, respectively.
Step 407, determining a first threshold and a second threshold based on the failure threshold.
The fault threshold is greater than the first threshold. The server subtracts the first difference value from the fault threshold value corresponding to the power battery with the target type and the ambient temperature as the target temperature to obtain a first threshold value corresponding to the power battery with the target type and the ambient temperature as the target temperature, and subtracts the second difference value from the fault threshold value corresponding to the power battery with the target type and the ambient temperature as the target temperature to obtain a second threshold value corresponding to the power battery with the target type and the ambient temperature as the target temperature. The first difference and the second difference are set experimentally or empirically, the first difference being less than the second difference.
In another possible implementation, the process includes the steps of:
and step 408, acquiring distribution information of monitoring parameters of at least one other power battery corresponding to the battery type and the ambient temperature of the power battery.
In some examples, after acquiring the distribution information of the monitoring parameters of the plurality of power batteries, the server classifies the power batteries according to the battery types and the ambient temperatures of the power batteries to obtain the distribution information of the monitoring parameters of other power batteries which are the same as the power batteries in step 201 in both types and ambient temperatures.
Step 409, based on the distribution information, determining the minimum value of the monitoring parameter with the proportion smaller than the first preset proportion as a first threshold value.
The first predetermined ratio is set experimentally or empirically. In some examples, the server determines, as the first threshold, a minimum value of the monitoring parameters having a proportion smaller than a first preset proportion, based on distribution information of the monitoring parameters of the power battery of the target type and the power battery having the ambient temperature at the target temperature.
And step 410, determining the minimum value of the monitoring parameter with the proportion smaller than a second preset proportion as a second threshold value based on the distribution information.
The first preset proportion is smaller than the second preset proportion. The second predetermined ratio is set experimentally or empirically. In some examples, the server determines, as the second threshold, a minimum value of the monitoring parameters having a proportion smaller than a second preset proportion, based on the distribution information of the monitoring parameters of the power battery of the target type and the power battery of which the ambient temperature is the target temperature.
The determination process of the first threshold and the second threshold is explained below by taking the working parameters of the power battery including the battery type, the ambient temperature, and the range of the mileage of the vehicle in which the power battery is located as an example.
In one possible implementation, the process includes the steps of:
step 411, obtaining a battery type of the power battery, an ambient temperature, and a fault threshold corresponding to a mileage interval of the vehicle.
In some examples, the failure threshold is detected by the server for vehicles having the same battery type, the same ambient temperature, the same mileage section, and a failure, the battery type of the power battery of the failed vehicle may be referred to as a target type, the ambient temperature of the power battery of the failed vehicle may be referred to as a target temperature, and the mileage section of the failed vehicle may be referred to as a target mileage section.
In this example, the fault thresholds corresponding to the power batteries of different battery types are different, the fault thresholds corresponding to the power batteries of different environmental temperatures are also different, and the fault thresholds corresponding to the power batteries of different mileage intervals are also different, so that the server needs to obtain the fault thresholds corresponding to the power batteries of the target type, the target temperature, and the mileage interval as the target mileage interval, so as to determine the first threshold and the second threshold corresponding to the power batteries of the target type, the environmental temperature as the target temperature, and the mileage interval as the target mileage interval, respectively.
In step 412, a first threshold and a second threshold are determined based on the fault threshold.
The fault threshold is greater than the first threshold. The server subtracts a first difference value from a fault threshold value corresponding to the power battery with the target type, the environment temperature as the target temperature and the mileage interval as the target mileage interval to obtain a first threshold value corresponding to the power battery with the target type, the environment temperature as the target temperature and the mileage interval as the target mileage interval, and subtracts a second difference value from a fault threshold value corresponding to the power battery with the target type, the environment temperature as the target temperature and the mileage interval as the target mileage interval to obtain a second threshold value corresponding to the power battery with the target type, the environment temperature as the target temperature and the mileage interval as the target mileage interval. The first difference and the second difference are set experimentally or empirically, the first difference being less than the second difference.
In another possible implementation, the process includes the steps of:
and 413, acquiring the distribution information of the monitoring parameters of at least one other power battery corresponding to the battery type and the environmental temperature of the power battery.
In some examples, after acquiring the distribution information of the monitoring parameters of the plurality of power batteries, the server classifies the power batteries according to the battery types, the environmental temperatures and the mileage intervals of the power batteries to obtain the distribution information of the monitoring parameters of other power batteries, which are the same as the types, the environmental temperatures and the mileage intervals of the power batteries in step 201.
Step 414, based on the distribution information, determining the minimum value of the monitoring parameter with the proportion smaller than the first preset proportion as the first threshold value.
The first predetermined ratio is set experimentally or empirically. In some examples, the server determines, as the first threshold, a minimum value of the monitoring parameters having a proportion smaller than a first preset proportion, based on distribution information of the monitoring parameters of the power battery having a target type, an ambient temperature as a target temperature, and a mileage interval as a target mileage interval.
And 415, determining the minimum value of the monitoring parameter with the proportion smaller than a second preset proportion as a second threshold value based on the distribution information.
The first preset proportion is smaller than the second preset proportion. The second predetermined ratio is set experimentally or empirically. In some examples, the server target type, the environmental temperature as the target temperature, and the mileage interval as the distribution information of the monitoring parameters of the power battery with the target mileage interval determine the minimum value of the monitoring parameters with the proportion smaller than the second preset proportion as the second threshold.
In some examples, the associated device of the vehicle is provided with a switch of the power battery monitoring function, and the server monitors the operating state of the power battery of the vehicle when the switch of the power battery monitoring function is in an open state. In an alternative example provided based on the example shown in fig. 2, before step 202, the method further comprises the steps of: and receiving the state information of the power battery monitoring function sent by the associated equipment of the vehicle.
Under the condition that the state information of the power battery monitoring function is used for representing that the power battery monitoring function is in an open state, executing the step of acquiring the monitoring parameters of the power battery according to the charging parameters and the temperature parameters; and under the condition that the state information of the power battery monitoring function is used for representing that the power battery monitoring function is in a closed state, the step of obtaining the monitoring parameters of the power battery according to the charging parameters and the temperature parameters is not executed.
And the state information of the power battery monitoring function is used for representing that the power battery monitoring function is in an opening state or a closing state. Optionally, the associated device of the vehicle is provided with a switch of the power battery monitoring function, and the vehicle owner can trigger the switch according to the own requirement, so that the power battery monitoring function is switched between an on state and an off state. And the power battery monitoring function is used for representing a function of monitoring the working state of the power battery based on the monitoring parameters of the power battery.
According to the technical scheme, the switch for providing the power battery monitoring function at the associated equipment of the vehicle enables a vehicle owner to select whether to use the power battery monitoring function or not as required, and actual use requirements of the vehicle owner are met.
As shown in fig. 6, the present application example further provides a monitoring device for a power battery, including: a first obtaining module 601, a second obtaining module 602 and a status determining module 603.
The first obtaining module 601 is configured to obtain a charging parameter and a temperature parameter of at least one power battery, where the charging parameter includes a charging current of the power battery during a charging process, and the temperature parameter includes: the temperature of the power battery in the charging process or/and the ambient temperature of the power battery; a second obtaining module 602, configured to determine a monitoring parameter according to the charging parameter and the temperature parameter; the monitoring parameter is at least used for representing the temperature rise rate of the power battery; and the state determination module 603 is configured to determine a state of health of the power battery based on the monitoring parameter, where the state of health represents a degree of failure of the power battery.
According to the monitoring device for the power battery, the monitoring parameters are determined based on the charging parameters and the temperature parameters after the charging parameters and the temperature parameters of the power battery of the vehicle in the charging process are collected, and the monitoring parameters can reflect the temperature change condition of the power battery in the charging process or the temperature change condition under different charging currents; because the power battery can lead to the phenomenon that the temperature rises too fast in the charging process under different working conditions, namely the temperature rise rate of the power battery is too large, the working state of the power battery can be determined based on the monitoring parameters, for example, the power battery is in a state to be repaired (close to a fault state) and a state to be observed (exceeding a normal state but not close to the fault state), the monitoring of the power battery is realized, so that the power battery can be checked and maintained in time, and the use safety of the power battery is guaranteed.
In some examples, the second obtaining module 602 is configured to obtain a start temperature and an end temperature of the power battery during charging based on the temperature parameter; acquiring the ratio of the difference between the starting temperature and the ending temperature to the charging time as the temperature rise rate of the power battery; determining the temperature rise rate of the power battery as a monitoring parameter; or/and acquiring the charging current of the power battery in the charging process based on the charging parameters, and acquiring the starting temperature and the ending temperature of the power battery in the charging process based on the temperature parameters; determining the ratio of the difference between the starting temperature and the ending temperature to the charging time as the temperature rise rate of the power battery; the ratio between the rate of temperature rise and the charging current is determined as a monitoring parameter.
In some examples, the state determination module 603 is to: when the monitoring parameter is larger than a first threshold value, determining that the power battery is in a first state, wherein the first state is used for representing that the power battery is in a critical state of failure; when the monitoring parameter is larger than a second threshold and smaller than a first threshold, monitoring and determining that the power battery is in a second state, wherein the second state is used for representing that the power battery is between a critical state and a normal state of a fault; and when the monitoring parameter is smaller than a second threshold value, determining that the power battery is in a normal state.
In some examples, the apparatus further comprises: a threshold determination module. A threshold determination module to: acquiring working parameters of the power battery, wherein the working parameters comprise at least one of the following: the battery type of the power battery, the ambient temperature of the power battery and the mileage interval of the vehicle in which the power battery is positioned; the first threshold and the second threshold are determined based on an operating parameter of the power cell.
In some examples, the threshold determination module is configured to obtain a fault threshold corresponding to an operating parameter of the power battery, where the fault threshold refers to a minimum monitoring parameter of vehicles having the same operating parameter of the power battery when a fault occurs, and the first threshold is smaller than the fault threshold; the first threshold and the second threshold are determined based on a fault threshold.
In some examples, the threshold determination module is configured to obtain distribution information of monitoring parameters of at least one other power battery corresponding to the operating parameters of the power battery, where the distribution information is used to characterize a distribution interval of values of the monitoring parameters of the other power batteries having the same operating parameters of the power battery; determining the minimum value of the monitoring parameters with the proportion smaller than a first preset proportion as a first threshold value based on the distribution information; determining the minimum value of the monitoring parameters with the occupation ratio smaller than a second preset ratio as a second threshold value based on the distribution information; the first preset proportion is smaller than the second preset proportion.
In some examples, the apparatus further comprises: and a measure generation module. The measure generation module is used for sending repair reminding information to the associated equipment of the vehicle under the condition that the working state of the power battery is determined to be the first state, and the repair reminding information is used for reminding the vehicle to return to a factory for repair; the association equipment comprises an interaction device of the vehicle or external electronic equipment in communication connection with the vehicle; and in the case that the working state of the power battery is determined to be the second state, marking the vehicle as the vehicle to be observed.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and modules may refer to the corresponding processes in the foregoing method examples, and are not described again here.
In several examples provided in this application, the coupling of the modules to each other may be electrical, mechanical or other forms of coupling.
In addition, each functional module in each example of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
As shown in fig. 7, the present application example further provides an electronic device 700, where the electronic device 700 may be a server, the electronic device 700 includes a processor 710 and a memory 720, where the memory 720 stores computer program instructions, and the computer program instructions are invoked by the processor 710 to execute the above-mentioned monitoring method for a power battery.
Processor 710 may include one or more processing cores. The processor 710 interfaces with various interfaces and circuitry throughout the battery management system to perform various functions of the battery management system and process data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 720 and invoking data stored in the memory 720. Alternatively, the processor 710 may be implemented in hardware using at least one of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA). The processor 710 may integrate one or more of a Central Processing Unit (CPU) 710, a Graphics Processing Unit (GPU) 710, a modem, and the like. Wherein, the CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for rendering and drawing display content; the modem is used to handle wireless communications. It is understood that the modem may not be integrated into the processor 710, but may be implemented by a communication chip.
The Memory 720 may include a Random Access Memory (RAM) 720 and a Read-Only Memory (Read-Only Memory) 720. The memory 720 may be used to store instructions, programs, code sets, or instruction sets. The memory 720 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 examples described below, and the like. The data storage area may also store data created by the vehicle in use (such as a phone book, audio and video data, chat log data), and the like.
As shown in fig. 8, the present example also provides a computer-readable storage medium 800, in which computer-readable storage medium 800 is stored computer program instructions 810, and the computer program instructions 810 can be called by a processor to execute the method described in the above example.
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 800 has a storage space for program code for performing any of the method steps of the method 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 preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.

Claims (10)

1. A method of monitoring a power cell, the method comprising:
acquiring charging parameters and temperature parameters of at least one power battery, wherein the charging parameters comprise charging current of the power battery in a charging process, and the temperature parameters comprise: the temperature of the power battery in the charging process or/and the ambient temperature of the power battery;
determining a monitoring parameter according to the charging parameter and the temperature parameter; the monitoring parameter is at least used for representing the temperature rise rate of the power battery;
and determining the health state of the power battery based on the monitoring parameters, wherein the health state represents the fault degree of the power battery.
2. The method of claim 1, wherein determining a monitoring parameter as a function of the charging parameter and the temperature parameter comprises:
acquiring a starting temperature and an ending temperature of the power battery in a charging process based on the temperature parameter;
acquiring the ratio of the difference between the starting temperature and the ending temperature to the charging time as the temperature rise rate of the power battery;
determining the temperature rise rate of the power battery as the monitoring parameter; or/and
acquiring the charging current of the power battery in the charging process based on the charging parameters;
acquiring a starting temperature and an ending temperature of the power battery in a charging process based on the temperature parameter;
determining the ratio of the difference between the starting temperature and the ending temperature to the charging time as the temperature rise rate of the power battery;
determining a ratio between the rate of temperature rise and the charging current as the monitoring parameter.
3. The method of claim 1, wherein determining the state of health of the power cell based on the monitored parameter comprises:
when the monitoring parameter is larger than a first threshold value, determining that the power battery is in a first state, wherein the first state is used for representing that the power battery is in a critical state of fault;
when the monitoring parameter is larger than a second threshold and smaller than the first threshold, monitoring and determining that the power battery is in a second state, wherein the second state is used for representing that the power battery is between a critical state and a normal state of a fault;
and when the monitoring parameter is smaller than the second threshold value, determining that the power battery is in the normal state.
4. The method of claim 3, wherein prior to determining the state of health of the power cell based on the monitored parameter, further comprising:
obtaining working parameters of the power battery, wherein the working parameters comprise at least one of the following: the battery type of the power battery, the ambient temperature of the power battery, and the mileage interval of a vehicle in which the power battery is located;
determining the first threshold and the second threshold based on an operating parameter of the power battery.
5. The method of claim 4, wherein the determining the first threshold and the second threshold based on the operating parameter of the power cell comprises:
acquiring a fault threshold corresponding to the working parameters of the power battery, wherein the fault threshold refers to the minimum monitoring parameter of a vehicle with the same working parameters of the power battery when the vehicle fails, and the first threshold is smaller than the fault threshold;
determining the first threshold and the second threshold based on the failure threshold.
6. The method of claim 4, wherein the determining the first threshold and the second threshold based on the operating parameter of the power cell comprises:
acquiring distribution information of monitoring parameters of at least one other power battery corresponding to the working parameters of the power battery, wherein the distribution information is used for representing a distribution interval of numerical values of the monitoring parameters of the other power batteries with the same working parameters of the power battery;
determining the minimum value of the monitoring parameters with the proportion smaller than a first preset proportion as the first threshold value based on the distribution information;
determining the minimum value of the monitoring parameters with the proportion smaller than a second preset proportion as the second threshold value based on the distribution information;
the first preset proportion is smaller than the second preset proportion.
7. The method of claim 3, further comprising:
under the condition that the working state of the power battery is determined to be the first state, sending repair reminding information to associated equipment of the vehicle, wherein the repair reminding information is used for reminding the vehicle to return to a factory for repair; the association equipment comprises an interaction device of the vehicle or external electronic equipment in communication connection with the vehicle;
and under the condition that the working state of the power battery is determined to be the second state, marking the vehicle as a vehicle to be observed.
8. A power cell monitoring device, the device comprising:
the first acquisition module is used for acquiring charging parameters and temperature parameters of at least one power battery, wherein the charging parameters comprise charging current of the power battery in a charging process, and the temperature parameters comprise: the temperature of the power battery in the charging process or/and the ambient temperature of the power battery;
the second acquisition module is used for determining monitoring parameters according to the charging parameters and the temperature parameters; the monitoring parameter is at least used for representing the temperature rise rate of the power battery;
and the state determination module is used for determining the health state of the power battery based on the monitoring parameters, and the health state represents the fault degree of the power battery.
9. A server, characterized in that it comprises a processor and a memory, said memory storing computer program instructions which are invoked by said processor to perform a method for monitoring a power cell according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that a program code is stored in the computer-readable storage medium, which program code can be called by a processor to execute the monitoring method of a power battery according to any one of claims 1-7.
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