CN113093015B - Battery life estimation method, device, battery management system, automobile and medium - Google Patents
Battery life estimation method, device, battery management system, automobile and medium Download PDFInfo
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- 230000032683 aging Effects 0.000 claims description 5
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- 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
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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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/64—Constructional details of batteries specially adapted for electric vehicles
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- 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]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiment of the invention discloses a battery life estimation method, a device, a battery management system, an automobile and a medium. The battery life estimation method comprises the following steps: acquiring pressure parameters affecting the residual service life of the battery in the battery charge-discharge cycle; the pressure parameters include current, temperature, and residual electrical quantity values of the battery; determining the type of the pressure factor affecting the service life of the battery to which the current charge-discharge cycle belongs according to the pressure parameter; the pressure factor type influencing the service life of the battery comprises at least one of conventional charge and discharge, high Wen Changgui charge and discharge, low-temperature conventional charge and discharge, normal-temperature high-current charge and discharge and transitional discharge; determining the capacity change of the charge-discharge cycle battery according to a single-index life experience model corresponding to the determined type of the pressure factor influencing the life of the battery; the remaining life of the battery is estimated based on the change in the capacity of the battery. The technical scheme of the embodiment of the invention realizes more accurate estimation of the residual service life of the battery, and the method is simple.
Description
Technical Field
The embodiment of the invention relates to the technical field of energy automobiles, in particular to a battery life estimation method, a device, a battery management system, an automobile and a medium.
Background
The remaining service life of a power battery is the number of cycles that need to be experienced for the maximum available capacity of the power battery to decay to a specified failure threshold under a certain charge-discharge regime. The residual service life of the battery is a process of predicting and calculating the residual service life of the battery by using a certain mathematical means based on the historical data of the power battery.
With the increase of the charge and discharge cycle times of the power battery, some irreversible chemical reactions often occur in the power battery, so that the internal resistance is increased, the maximum available capacity, the energy and the peak power capacity are reduced, the driving range of the electric automobile is greatly shortened, and even potential safety hazards are possibly brought.
The reliable battery remaining life estimation can fully solve the problem that the user anxiety the uncertain mileage of the remaining driving range and worries about potential safety hazards, ensure the safe and efficient operation of the power battery pack, greatly improve the safety and reliability of the electric automobile in the driving process, reduce the failure rate and the operation cost and improve the user experience. Therefore, how to accurately estimate the remaining service life of the battery is a technical problem to be solved currently.
Disclosure of Invention
The embodiment of the invention provides a battery life estimation method, a device, a battery management system, an automobile and a medium, so that the residual service life of a battery can be estimated more accurately, and the method is simple.
In a first aspect, an embodiment of the present invention provides a battery life estimation method, including:
acquiring pressure parameters affecting the residual service life of the battery in the battery charge-discharge cycle; the pressure parameters include current, temperature and residual electricity value of the battery;
determining the type of the pressure factor affecting the service life of the battery to which the current charge-discharge cycle belongs according to the pressure parameter; the pressure factor type influencing the service life of the battery comprises at least one of conventional charge and discharge, high Wen Changgui charge and discharge, low-temperature conventional charge and discharge, normal-temperature high-current charge and discharge and transitional discharge;
determining the capacity change of the battery in the current charge and discharge cycle according to a single-index life experience model corresponding to the determined type of the pressure factor influencing the life of the battery;
and estimating the remaining life of the battery based on the capacity change of the battery.
Optionally, the single-index life experience model corresponding to the conventional charge and discharge is a conventional charge and discharge single-index life experience model;
the single-index life experience model corresponding to the high-temperature conventional charge and discharge is a high Wen Changgui charge and discharge single-index life experience model;
the single-index life experience model corresponding to the low-temperature conventional charge and discharge is a low-temperature conventional charge and discharge single-index life experience model;
the single-index life experience model corresponding to the normal-temperature heavy-current charge and discharge is a normal-temperature heavy-current charge and discharge single-index life experience model;
the single-index life experience model corresponding to the transition discharge is a transition discharge single-index life experience model.
Optionally, the conventional charge and discharge includes a current of less than 25A during the charge and discharge of the battery and a temperature of less than 45 ℃ and greater than 5 ℃ during the charge and discharge;
the high-temperature conventional charge and discharge comprises that the current of the battery in the charge and discharge process is less than 25A, and the temperature of the battery in the charge and discharge process is greater than or equal to 45 ℃;
the low-temperature conventional charge and discharge comprises that the current of the battery in the charge and discharge process is less than 25A, and the temperature of the battery in the charge and discharge process is less than or equal to 5 ℃;
the normal-temperature high-current charge and discharge comprises the steps that the current of the battery in the charge and discharge process is more than or equal to 25A, and the temperature of the battery in the charge and discharge process is less than 45 ℃ and more than 5 ℃;
the transition discharging comprises that the residual electric quantity value of the battery is less than or equal to 20 percent in the charging and discharging process of the battery.
Optionally, before obtaining the pressure parameter affecting the remaining service life of the battery in the current battery charging and discharging cycle, the method further includes:
and respectively establishing a conventional charge-discharge single-index life empirical model of conventional charge and discharge, a high Wen Changgui charge-discharge single-index life empirical model of high Wen Changgui charge and discharge, a low-temperature conventional charge-discharge single-index life empirical model of low-temperature conventional charge and discharge, a normal-temperature high-current charge-discharge single-index life empirical model of normal-temperature high-current charge and discharge and a transition-discharge single-index life empirical model of transition discharge.
Optionally, estimating the remaining life of the battery based on the capacity change of the battery includes:
acquiring a maximum remaining capacity of the battery based on a capacity change of the battery;
and determining the residual cycle times of the battery according to the capacity-cycle times curve and the maximum residual capacity, and taking the residual cycle times as the residual life of the battery.
Optionally, before obtaining the pressure parameter affecting the remaining service life of the battery in the current battery charging and discharging cycle, the method further includes:
the capacity-cycle number curve was fitted according to the battery offline aging test.
In a second aspect, an embodiment of the present invention further provides a battery life estimating apparatus, including:
the acquisition module is used for acquiring pressure parameters affecting the residual service life of the battery in the current battery charging and discharging cycle; the pressure parameters include current, temperature and residual electricity value of the battery;
the type determining module is used for determining the type of the pressure factor affecting the service life of the battery, which the charge and discharge cycle belongs to, according to the pressure parameter; the pressure factor type influencing the service life of the battery comprises at least one of conventional charge and discharge, high Wen Changgui charge and discharge, low-temperature conventional charge and discharge, normal-temperature high-current charge and discharge and transitional discharge;
the capacity change determining module is used for determining the capacity change of the battery in the current charge and discharge cycle according to the single-index life experience model corresponding to the determined type of the pressure factor affecting the life of the battery;
and the estimation module is used for estimating the residual life of the battery based on the capacity change of the battery.
In a third aspect, an embodiment of the present invention further provides a battery management system, including:
one or more processors;
a memory for storing one or more programs;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the battery life estimation method provided by any embodiment of the present invention.
In a fourth aspect, the embodiment of the invention also provides an automobile, which comprises the battery management system provided by the embodiment of the invention.
In a fifth aspect, embodiments of the present invention further provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the battery life estimation method provided by any embodiment of the present invention.
According to the technical scheme provided by the embodiment of the invention, the pressure factors influencing the service life of the battery are divided into five types, namely conventional charge and discharge, high Wen Changgui charge and discharge, low-temperature conventional charge and discharge, normal-temperature high-current charge and discharge and transitional discharge, then the type of the pressure factor influencing the service life of the battery, which belongs to the cycle, is determined according to the pressure parameter of one complete charge and discharge cycle at a time, then the accumulated influence of the capacity change of the battery, which is caused by various types in the cycle, is determined according to the single-index service life experience model corresponding to the determined type of the pressure factor influencing the service life of the battery, and the residual service life of the battery is estimated based on the accumulated influence of the capacity change. The method comprehensively considers the pressure factors influencing the service life of the battery, can accurately estimate the residual service life of the battery, and has the characteristics of simple method, less calculated amount and suitability for the running environment of the real vehicle.
Drawings
FIG. 1 is a flowchart of a battery life estimation method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a battery life estimating apparatus according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a battery management system according to a third embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a flowchart of a battery life estimation method according to an embodiment of the present invention, where the present embodiment is applicable to a case of estimating remaining service life of a battery. The method may be performed by a battery life estimation device provided by an embodiment of the present invention, which may be implemented in software and/or hardware, and which may be integrated on a battery management system.
Referring to fig. 1, the battery life estimation method according to the embodiment of the present invention includes the steps of:
s110, acquiring pressure parameters affecting the residual service life of the battery in the current battery charge-discharge cycle; the pressure parameter includes a current, a temperature, and a remaining electrical quantity value of the battery.
Among the pressure factors affecting the life of the battery are mainly current, temperature and the residual electrical quantity value of the battery. When the battery is charged and discharged, the service life of the battery can be influenced by the excessively high or low temperature; and/or excessive current may also have an effect on the life of the battery; and/or if the remaining electrical power value of the battery is too low, for example, 20%, charge and discharge of the battery may also have an effect on the life of the battery.
For example, the temperature of the battery in the complete charge-discharge cycle of the present time can be obtained in real time through a temperature sensor; for example, the current of the battery in the complete charge-discharge cycle can be obtained through the embodiment of the current sensor; the remaining power value of the battery may be obtained in real time, for example, by a battery management system. And storing the temperature, the current and the residual electric quantity value of the battery which are acquired in real time in a storage module until the current battery charge-discharge cycle is finished, and acquiring the complete battery charge-discharge cycle data.
S120, determining the type of the pressure factor affecting the service life of the battery to which the current charge and discharge cycle belongs according to the pressure parameter; the pressure factor type influencing the service life of the battery comprises at least one of conventional charge and discharge, high Wen Changgui charge and discharge, low-temperature conventional charge and discharge, normal-temperature high-current charge and discharge and transitional discharge.
Among them, the pressure factors affecting the life of the battery are divided into five types, i.e., conventional charge and discharge, high Wen Changgui charge and discharge, low-temperature conventional charge and discharge, normal-temperature high-current charge and discharge, and transitional discharge, and the five types are stored in the memory module. Determining which of the five types the current charge and discharge cycle belongs to based on the current, the temperature and the residual electric power value of the battery in the complete cycle acquired in the step S110, wherein the type to which the current charge and discharge cycle belongs can be one type; and may be various.
Optionally, the conventional charge and discharge includes a current of less than 25A during the charge and discharge of the battery and a temperature of less than 45 ℃ and greater than 5 ℃ during the charge and discharge of the battery; the high Wen Changgui charge and discharge includes that the current of the battery in the charge and discharge process is less than 25A, and the temperature of the battery in the charge and discharge process is more than or equal to 45 ℃; the low-temperature conventional charge and discharge comprises that the current of the battery in the charge and discharge process is less than 25A, and the temperature of the battery in the charge and discharge process is less than or equal to 5 ℃; the normal-temperature high-current charge and discharge comprises that the current of the battery in the charge and discharge process is more than or equal to 25A, and the temperature of the battery in the charge and discharge process is less than 45 ℃ and more than 5 ℃; the transition discharge includes that the residual electric quantity value of the battery is less than or equal to 20% in the charge and discharge process of the battery.
That is, when the temperature collected during the charge and discharge of the battery is between 5 ℃ and 45 ℃ and the current is less than 25A, the battery charge and discharge cycle is of the conventional charge and discharge type. In the charge and discharge process of the battery, when the collected temperature is greater than or equal to 45 ℃ and the current is less than 25A, the type of charge and discharge cycle of the battery is high Wen Changgui charge and discharge. In the charge and discharge process of the battery, when the collected temperature is less than or equal to 5 ℃ and the current is less than 25A, the battery charge and discharge cycle is of a low-temperature conventional charge and discharge type. In the charge and discharge process of the battery, when the collected temperature is less than or equal to 5 ℃ and the current is less than 25A, the battery charge and discharge cycle is of a low-temperature conventional charge and discharge type. In the charging and discharging process of the battery, when the collected residual electric quantity value of the battery is less than or equal to 20%, the type of the battery charging and discharging cycle is transitional discharging.
For example, in the complete charge-discharge cycle, the collected current is 30A, the temperature is 50 ℃ and the residual electric quantity value of the battery is 15%, so that the pressure factor type affecting the service life of the battery, which belongs to the current charge-discharge cycle, can be determined to be three types of high Wen Changgui charge-discharge, normal-temperature high-current charge-discharge and transitional discharge.
In this complete charge-discharge cycle, the collected current is 22A, the temperature is 30 ℃ and the residual electric quantity value of the battery is 15%, so that the pressure factor type affecting the service life of the battery, which belongs to the current charge-discharge cycle, can be determined to be a type of transition discharge.
S130, determining the capacity change of the charge-discharge cycle battery according to the single-index life experience model corresponding to the determined type of the pressure factor influencing the life of the battery.
Wherein each type of pressure factor affecting battery life corresponds to a single exponential life experience module. Based on the determined type of the pressure factor affecting the service life of the battery, the variation of the capacity of the battery in the charge and discharge cycle can be determined according to a single-index service life experience model corresponding to the type of the pressure factor affecting the service life of the battery.
Each of which causes a change in battery capacity.
When the type of the pressure factor affecting the service life of the battery, which belongs to the current charge-discharge cycle, is one type, the capacity change of the battery of the current charge-discharge cycle is determined according to a single-index service life experience model corresponding to the type.
For example, when the types of pressure factors affecting the life of the battery to which the present charge-discharge cycle belongs are three types, for example, the three types are high Wen Changgui charge-discharge, normal temperature heavy current charge-discharge and transitional discharge, the change amount of the battery capacity is determined according to the single-index life experience module corresponding to the high Wen Changgui charge-discharge, the change amount of the battery capacity is determined according to the single-index life experience module corresponding to the normal temperature heavy current charge-discharge, and the change amount of the battery capacity is determined according to the single-index life experience module corresponding to the transitional discharge, and the change amount of the battery capacity is the change of the capacity of the battery in the present charge-discharge cycle.
Optionally, the single-index life experience model corresponding to the conventional charge and discharge is a conventional charge and discharge single-index life experience model; the single-index life experience model corresponding to high Wen Changgui charge and discharge is a high Wen Changgui charge and discharge single-index life experience model; the single-index life experience model corresponding to the low-temperature conventional charge and discharge is a low-temperature conventional charge and discharge single-index life experience model; the single-index life experience model corresponding to the normal-temperature heavy-current charge and discharge is a normal-temperature heavy-current charge and discharge single-index life experience model; the single-index life experience model corresponding to the transition discharge is the single-index life experience model of the transition discharge.
Optionally, before obtaining the pressure parameter affecting the remaining service life of the battery in the current battery charging and discharging cycle, the method further includes: and respectively establishing a conventional charge-discharge single-index life empirical model of conventional charge and discharge, a high Wen Changgui charge-discharge single-index life empirical model of high Wen Changgui charge and discharge, a low-temperature conventional charge-discharge single-index life empirical model of low-temperature conventional charge and discharge, a normal-temperature high-current charge-discharge single-index life empirical model of normal-temperature high-current charge and discharge and a transition-discharge single-index life empirical model of transition discharge.
The pressure factors influencing the service life of the battery are divided into five types, namely conventional charge and discharge, high Wen Changgui charge and discharge, low-temperature conventional charge and discharge, normal-temperature high-current charge and discharge and transitional discharge. Then determining the influence of a single factor (temperature, current or low battery power) on the capacity change of the battery, namely the corresponding relation of the influence of the conventional temperature and the conventional current on the capacity change of the battery (conventional charge-discharge single-index life experience model) in a fitting mode of an offline aging test; correspondence of the influence of high temperature on the capacity change of the battery (high Wen Changgui charge-discharge single-index life experience model); correspondence of the influence of low temperature on the capacity change of the battery (low-temperature conventional charge-discharge single-index life experience model); correspondence relation of influence of large current on capacity change of battery (normal temperature large current charge-discharge single exponential life experience model); correspondence of the influence of low electric power on the capacity change of the battery (transient discharge single exponential life empirical model). The above correspondence relationship may be, for example, an empirical formula, and the present embodiment is not limited thereto.
And S140, estimating the residual life of the battery based on the capacity change of the battery.
The remaining life of the battery can be determined, for example, by subtracting the change of the capacitance of the battery caused by the current cycle from the remaining life of the battery in the last charge-discharge cycle.
Optionally, estimating the remaining life of the battery based on the change in capacity of the battery includes:
acquiring a maximum remaining capacity of the battery based on the capacity change of the battery;
and determining the residual cycle times of the battery according to the capacity-cycle times curve and the maximum residual capacity, and taking the residual cycle times as the residual life of the battery.
For example, when the pressure factor type affecting the service life of the battery to which the present charge-discharge cycle belongs is multiple types, estimating the maximum remaining capacity of the battery by using the cumulative effect of the multiple types on the remaining maximum capacity of the battery; the maximum remaining capacity of the battery can be estimated by subtracting the capacity change value of the battery caused by each type from the maximum remaining capacity of the battery in the last charge-discharge cycle. And then determining the residual cycle times of the battery according to the capacity-cycle times curve and the maximum residual capacity, and taking the residual cycle times as the residual life of the battery.
On the basis of the above scheme, optionally, before obtaining the pressure parameter affecting the remaining service life of the battery in the current battery charging and discharging cycle, the method further comprises: and fitting a capacity-cycle number curve according to the battery offline aging test. The corresponding relation between the maximum capacity of the battery and the cycle times is obtained, and the residual cycle times of the battery can be determined according to the corresponding relation after the maximum residual capacity of the battery is determined.
According to the technical scheme provided by the embodiment of the invention, the pressure factors influencing the service life of the battery are divided into five types, namely conventional charge and discharge, high Wen Changgui charge and discharge, low-temperature conventional charge and discharge, normal-temperature high-current charge and discharge and transitional discharge, then the type of the pressure factor influencing the service life of the battery, which belongs to the cycle, is determined according to the pressure parameter of one complete charge and discharge cycle at a time, then the accumulated influence of the capacity change of the battery, which is caused by various types in the cycle, is determined according to the single-index service life experience model corresponding to the determined type of the pressure factor influencing the service life of the battery, and the residual service life of the battery is estimated based on the accumulated influence of the capacity change. The method comprehensively considers the pressure factors influencing the service life of the battery, can accurately estimate the residual service life of the battery, and has the characteristics of simple method, less calculated amount and suitability for the running environment of the real vehicle.
Example two
Fig. 2 is a schematic structural diagram of a battery life estimating apparatus according to a second embodiment of the present invention, which is configured to perform the battery life estimating method according to any of the above embodiments. The device belongs to the same inventive concept as the battery life estimation method of each of the above embodiments, and reference may be made to the above embodiments of the battery life estimation method for details not described in detail in the embodiments of the battery life estimation device. Referring to fig. 2, the apparatus may specifically include: an acquisition module 210, a type determination module 220, a capacity change determination module 230, and an estimation module 240.
The acquiring module 210 is configured to acquire a pressure parameter affecting a remaining service life of the battery in the current battery charging and discharging cycle; the pressure parameters include current, temperature and residual electricity value of the battery;
a type determining module 220, configured to determine, according to the pressure parameter, a type of a pressure factor affecting the life of the battery to which the current charge-discharge cycle belongs; the pressure factor type influencing the service life of the battery comprises at least one of conventional charge and discharge, high Wen Changgui charge and discharge, low-temperature conventional charge and discharge, normal-temperature high-current charge and discharge and transitional discharge.
The capacity change determining module 230 is configured to determine a capacity change of the battery in the current charge and discharge cycle according to the determined single-index life experience model corresponding to the type of the pressure factor affecting the life of the battery;
an estimation module 240 is configured to estimate the remaining life of the battery based on the change in capacity of the battery.
Optionally, the battery life estimating apparatus provided by the embodiment of the present invention further includes:
the building module is used for respectively building a high Wen Changgui charge-discharge single-index life experience model of conventional charge and discharge, a high Wen Changgui charge-discharge single-index life experience model of high Wen Changgui charge and discharge, a low-temperature conventional charge-discharge single-index life experience model of low-temperature conventional charge and discharge, a normal-temperature high-current charge-discharge single-index life experience model of normal-temperature high-current charge and discharge and a transition discharge single-index life experience model of transition discharge.
Optionally, the estimation module 240 may specifically include:
an acquisition unit configured to acquire a maximum remaining capacity of the battery based on a change in the capacity of the battery;
and the estimation unit is used for determining the residual cycle times of the battery according to the capacity-cycle times curve and the maximum residual capacity, and taking the residual cycle times as the residual life of the battery.
Based on the above scheme, optionally, the battery life estimating apparatus provided by the embodiment of the present invention further includes:
and the fitting module is used for fitting a capacity-cycle number curve according to the battery offline aging test.
According to the battery life estimation device provided by the second embodiment of the invention, the pressure factors influencing the battery life are divided into five types of conventional charge and discharge, high Wen Changgui charge and discharge, low-temperature conventional charge and discharge, normal-temperature high-current charge and discharge and transitional discharge, and the pressure parameters of one complete charge and discharge cycle at a time are acquired through the acquisition module; the type determining module determines the type of the pressure factor affecting the service life of the battery to which the cycle belongs; the capacity change determining module determines the capacity change accumulation amount of the battery caused by various types in the current cycle according to the single-index life experience model corresponding to the determined type of the pressure factor affecting the life of the battery; the estimation module estimates a remaining life of the battery based on the capacity change amount influence. The device comprehensively considers the pressure factors influencing the service life of the battery, can accurately estimate the residual service life of the battery, and has the characteristics of simple method, less calculated amount and suitability for the running environment of the real vehicle.
The battery life estimation device provided by the embodiment of the invention can execute the battery life estimation method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
It should be noted that, in the above embodiment of the battery life estimating apparatus, each unit and module included is only divided according to the functional logic, but is not limited to the above division, as long as the corresponding function can be realized; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Example III
Fig. 3 is a schematic structural diagram of a battery management system according to a third embodiment of the present invention, and as shown in fig. 3, the battery management system includes a memory 310, a processor 320, an input device 330 and an output device 340. The number of processors 320 in the server may be one or more, one processor 320 being taken as an example in fig. 3; the memory 310, processor 320, input device 330, and output device 340 in the server may be connected by a bus or other means, as exemplified by bus 350 in fig. 3.
The memory 310 is a computer readable storage medium, and may be used to store a software program, a computer executable program, and modules, such as program instructions/modules corresponding to the battery life estimation method in the embodiment of the present invention (e.g., the acquisition module 210, the type determination module 220, the capacity change determination module 230, and the estimation module 240 in the battery life estimation device). The processor 320 performs various functional applications of the server and data processing, i.e., implements the above-described battery life estimation method, by running software programs, instructions, and modules stored in the memory 310.
Memory 310 may include primarily a program storage area and a data storage area, wherein the program storage area may store an operating system, at least one application program required for functionality; the storage data area may store data created according to the use of the server, etc. In addition, memory 310 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, memory 310 may further include memory located remotely from processor 320, which may be connected to the device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 330 may be used to receive input numeric or character information and to generate key signal inputs related to user settings and function control of the device. The output device 340 may include a display device such as a display screen.
Example IV
An embodiment of the present invention provides an automobile, which includes the battery management system provided in the above embodiment. Therefore, the automobile also has the advantageous effects possessed by the battery management system in the above embodiment, and the same points can be understood with reference to the explanation of the battery management system above.
Example five
A fifth embodiment of the present invention provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are for performing a battery life estimation method, the method comprising:
acquiring pressure parameters affecting the residual service life of the battery in the battery charge-discharge cycle; the pressure parameters include current, temperature, and residual electrical quantity values of the battery;
determining the type of the pressure factor affecting the service life of the battery to which the current charge-discharge cycle belongs according to the pressure parameter; the pressure factor type influencing the service life of the battery comprises at least one of conventional charge and discharge, high Wen Changgui charge and discharge, low-temperature conventional charge and discharge, normal-temperature high-current charge and discharge and transitional discharge;
determining the capacity change of the charge-discharge cycle battery according to a single-index life experience model corresponding to the determined type of the pressure factor influencing the life of the battery;
the remaining life of the battery is estimated based on the change in the capacity of the battery.
Of course, the storage medium containing the computer executable instructions provided in the embodiments of the present invention is not limited to the method operations described above, and may also perform the related operations in the battery life estimation method provided in any embodiment of the present invention.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. In light of such understanding, the technical solution of the present invention may be embodied essentially or in part in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), FLASH Memory (FLASH), hard disk, optical disk, etc., of a computer, which may be a personal computer, a server, a network device, etc., and which includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in the embodiments of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. A battery life estimation method, comprising:
acquiring pressure parameters affecting the residual service life of the battery in the battery charge-discharge cycle; the pressure parameters include current, temperature and residual electricity value of the battery;
determining the type of the pressure factor affecting the service life of the battery to which the current charge-discharge cycle belongs according to the pressure parameter; the pressure factor type influencing the service life of the battery comprises at least one of conventional charge and discharge, high Wen Changgui charge and discharge, low-temperature conventional charge and discharge, normal-temperature high-current charge and discharge and transitional discharge; the conventional charge and discharge comprises that the current of the battery in the charge and discharge process is less than 25A, and the temperature of the battery in the charge and discharge process is less than 45 ℃ and is more than 5 ℃; the high-temperature conventional charge and discharge comprises that the current of the battery in the charge and discharge process is less than 25A, and the temperature of the battery in the charge and discharge process is greater than or equal to 45 ℃; the low-temperature conventional charge and discharge comprises that the current of the battery in the charge and discharge process is less than 25A, and the temperature of the battery in the charge and discharge process is less than or equal to 5 ℃; the normal-temperature high-current charge and discharge comprises the steps that the current of the battery in the charge and discharge process is more than or equal to 25A, and the temperature of the battery in the charge and discharge process is less than 45 ℃ and more than 5 ℃; the transition discharging comprises that the residual electric quantity value of the battery is less than or equal to 20% in the charging and discharging process of the battery;
determining the capacity change of the battery in the current charge and discharge cycle according to a single-index life experience model corresponding to the determined type of the pressure factor influencing the life of the battery; the single-index life experience model corresponding to the conventional charge and discharge is a conventional charge and discharge single-index life experience model; the single-index life experience model corresponding to the high-temperature conventional charge and discharge is a high Wen Changgui charge and discharge single-index life experience model; the single-index life experience model corresponding to the low-temperature conventional charge and discharge is a low-temperature conventional charge and discharge single-index life experience model; the single-index life experience model corresponding to the normal-temperature heavy-current charge and discharge is a normal-temperature heavy-current charge and discharge single-index life experience model; the single-index life experience model corresponding to the transition discharge is a transition discharge single-index life experience model;
and estimating the remaining life of the battery based on the capacity change of the battery.
2. The battery life estimation method according to claim 1, wherein before acquiring the pressure parameter affecting the remaining life of the battery in the present battery charge-discharge cycle, further comprising:
and respectively establishing a conventional charge-discharge single-index life empirical model of conventional charge and discharge, a high Wen Changgui charge-discharge single-index life empirical model of high Wen Changgui charge and discharge, a low-temperature conventional charge-discharge single-index life empirical model of low-temperature conventional charge and discharge, a normal-temperature high-current charge-discharge single-index life empirical model of normal-temperature high-current charge and discharge and a transition-discharge single-index life empirical model of transition discharge.
3. The battery life estimation method according to claim 1, characterized in that estimating the remaining life of the battery based on the capacity change of the battery comprises:
acquiring a maximum remaining capacity of the battery based on a capacity change of the battery;
and determining the residual cycle times of the battery according to the capacity-cycle times curve and the maximum residual capacity, and taking the residual cycle times as the residual life of the battery.
4. The battery life estimation method according to claim 3, further comprising, before acquiring the pressure parameter affecting the remaining life of the battery in the current battery charge-discharge cycle:
the capacity-cycle number curve was fitted according to the battery offline aging test.
5. A battery life estimating apparatus, comprising:
the acquisition module is used for acquiring pressure parameters affecting the residual service life of the battery in the current battery charging and discharging cycle; the pressure parameters include current, temperature and residual electricity value of the battery;
the type determining module is used for determining the type of the pressure factor affecting the service life of the battery, which the charge and discharge cycle belongs to, according to the pressure parameter; the pressure factor type influencing the service life of the battery comprises at least one of conventional charge and discharge, high Wen Changgui charge and discharge, low-temperature conventional charge and discharge, normal-temperature high-current charge and discharge and transitional discharge; the conventional charge and discharge comprises that the current of the battery in the charge and discharge process is less than 25A, and the temperature of the battery in the charge and discharge process is less than 45 ℃ and is more than 5 ℃; the high-temperature conventional charge and discharge comprises that the current of the battery in the charge and discharge process is less than 25A, and the temperature of the battery in the charge and discharge process is greater than or equal to 45 ℃; the low-temperature conventional charge and discharge comprises that the current of the battery in the charge and discharge process is less than 25A, and the temperature of the battery in the charge and discharge process is less than or equal to 5 ℃; the normal-temperature high-current charge and discharge comprises the steps that the current of the battery in the charge and discharge process is more than or equal to 25A, and the temperature of the battery in the charge and discharge process is less than 45 ℃ and more than 5 ℃; the transition discharging comprises that the residual electric quantity value of the battery is less than or equal to 20% in the charging and discharging process of the battery;
the capacity change determining module is used for determining the capacity change of the battery in the current charge and discharge cycle according to the single-index life experience model corresponding to the determined type of the pressure factor affecting the life of the battery; the single-index life experience model corresponding to the conventional charge and discharge is a conventional charge and discharge single-index life experience model; the single-index life experience model corresponding to the high-temperature conventional charge and discharge is a high Wen Changgui charge and discharge single-index life experience model; the single-index life experience model corresponding to the low-temperature conventional charge and discharge is a low-temperature conventional charge and discharge single-index life experience model; the single-index life experience model corresponding to the normal-temperature heavy-current charge and discharge is a normal-temperature heavy-current charge and discharge single-index life experience model; the single-index life experience model corresponding to the transition discharge is a transition discharge single-index life experience model;
and the estimation module is used for estimating the residual life of the battery based on the capacity change of the battery.
6. A battery management system, the battery management system comprising:
one or more processors;
a memory for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the battery life estimation method of any of claims 1-4.
7. An automobile, comprising: the battery management system of claim 6.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the battery life estimation method according to any one of claims 1-4.
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| CN114520822A (en) * | 2022-02-16 | 2022-05-20 | 东集技术股份有限公司 | Monitoring system, method, equipment and storage medium for equipment battery |
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