CN107015166B - For estimating the method and computer readable storage medium of battery power status - Google Patents
For estimating the method and computer readable storage medium of battery power status Download PDFInfo
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- CN107015166B CN107015166B CN201710477836.4A CN201710477836A CN107015166B CN 107015166 B CN107015166 B CN 107015166B CN 201710477836 A CN201710477836 A CN 201710477836A CN 107015166 B CN107015166 B CN 107015166B
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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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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- Chemical & Material Sciences (AREA)
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Tests Of Electric Status Of Batteries (AREA)
Abstract
Embodiment of the present invention provides a kind of for estimating the method and computer readable storage medium of battery SOE, belongs to Cell Evaluation field.This method comprises: the temperature of detection battery；The capacity of battery at such a temperature is determined according to the first corresponding relationship of the capacity of the temperature and the temperature and battery that prestore；The SOC of battery is determined according to battery capacity；The open-circuit voltage of the battery at the SOC of battery is determined according to the second corresponding relationship of the open-circuit voltage of the SOC of battery and the SOC and battery that prestore；And the energy state SOE of battery is estimated according to the electric current of the capacity of battery, open-circuit voltage and battery.This method and storage medium can be corrected SOE by detecting the temperature of battery, so that the estimation of SOE is more accurate.
Description
Technical field
The present invention relates to Cell Evaluation fields, more particularly to a kind of for estimating the method and calculating of battery power status
Machine readable storage medium storing program for executing.
Background technique
It is influenced by energy crisis and environmental crisis, electric car has obtained cracking development.For electric car,
Estimation to course continuation mileage is a problem.Common lithium battery charge state (State of Charge, SOC) comes to it at present
Course continuation mileage is judged, but the mileage that SOC continues a journey with electric car does not change linearly, in battery discharge latter stage, SOC
Variation will fast mistake can course continuation mileage, the erroneous judgement which results in user to electric car course continuation mileage.
Lithium battery energy state (State of Energy, SOE) is closely related with electric car course continuation mileage, with SOE generation
Doing course continuation mileage judgement for SOC is a kind of better way.Lithium battery state estimation mostly carries out at normal temperature, often sets battery
Parameter be steady state value.But in electric car actual moving process, seasonal variations will lead to lithium battery use environment temperature
Change, especially in northern area, this variation is particularly evident, and the characterisitic parameters such as the capacity of lithium battery and internal resistance can be with temperature
The variation of degree and show biggish difference, which results in the inaccuracy of the algorithm of lithium battery state estimation.
Summary of the invention
The purpose of embodiment of the present invention is to provide a kind of method for estimating battery power status and computer-readable
Storage medium, this method and computer readable storage medium can be corrected SOE by detecting the temperature of battery, so that
The estimation of SOE is more accurate.
To achieve the goals above, on the one hand embodiment of the present invention provides a kind of for estimating the side of battery power status
Method, this method comprises:
Detect the temperature of battery；
It is determined according to the first corresponding relationship of the capacity of the temperature of battery and the temperature and battery that prestore electric at such a temperature
The capacity in pond；
The SOC of battery is determined according to the capacity；
It is determined at the SOC according to the second corresponding relationship of the open-circuit voltage of the SOC of the battery and the SOC and battery that prestore
Battery open-circuit voltage；And
The SOE of battery is estimated according to the electric current of the capacity, open-circuit voltage and battery.
Optionally, which includes battery pack, which includes multiple battery units, and the temperature for detecting battery can wrap
It includes: detecting the temperature of each battery unit in multiple battery units；According to the temperature computation of each battery unit detected electricity
The mean temperature of pond group.
Optionally, it is determined according to the first corresponding relationship of the temperature detected and the temperature prestored and the capacity of battery at this
At a temperature of the capacity of battery may include: to calculate the capacity using polygometry.
Optionally, calculating the capacity using polygometry may include:
The capacity of battery is calculated according to formula (1):
Wherein, y is the capacity of calculated battery, and x is the temperature of the battery detected, and x1 and x2 are respectively first corresponding
Two temperature values adjacent with temperature x in relationship, y1 and y2 are battery corresponding with x1 and x2 respectively in the first corresponding relationship
Capability value.
Optionally, it is determined according to the second corresponding relationship of the open-circuit voltage of the SOC and the SOC and battery that prestore in the SOC
Under battery open-circuit voltage may include: using polygometry calculate battery open-circuit voltage.
Optionally, may include: using the open-circuit voltage that polygometry calculates battery
The open-circuit voltage of battery is calculated according to formula (2):
Wherein, VocFor the open-circuit voltage of calculated battery, SOC is that SOC, SOC1 and the SOC2 of the battery are respectively second
Two SOC values adjacent with SOC, V in corresponding relationshipoc1And Voc2It is corresponding with SOC1 and SOC2 respectively in the second corresponding relationship
The open-circuit voltage values of battery.
Optionally, determine that the energy state SOE of battery can according to the electric current of the capacity of battery, open-circuit voltage and battery
To include: the SOE value using current integration method estimation battery.
Optionally, may include: using the SOE value of current integration method estimation battery
The SOE value of battery is estimated according to formula (3):
Wherein, C0For the rated capacity of battery, SOE (0) is the initial SOE value of battery, and SOE (t) is the battery estimated
SOE value, t be battery discharge time, i (t) be the t time battery electric current, η be battery charging and discharging multiplying power influence because
Son, VocIt (t) is open-circuit voltage, Voc(0) open-circuit voltage for battery when fully charged.
Optionally, the value of the η can be 1.
The another aspect of embodiments of the present invention is to provide a kind of computer readable storage medium, this is computer-readable to deposit
It is stored with instruction in storage media, executes processor above-mentioned for estimating battery
Part or all of the method and step of SOE.
Through the above technical solutions, provided by the present invention for estimating the method for battery power status and computer-readable depositing
Storage media can be corrected SOE according to the temperature of battery, so that the estimation of SOE is more accurate.
The other feature and advantage of embodiment of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is to further understand for providing to embodiment of the present invention, and constitute part of specification, with
Following specific embodiment is used to explain the present invention embodiment together, but does not constitute the limit to embodiment of the present invention
System.In the accompanying drawings:
Fig. 1 is the flow chart of the method for estimating battery SOE according to an embodiment of the present invention；
Fig. 2 shows the capacity that battery is calculated using polygometry；
Fig. 3 shows the open-circuit voltage that battery is calculated using polygometry；
Fig. 4 is the flow chart of the method for estimating battery SOE according to an embodiment of the present invention；
Fig. 5 is the structural block diagram of the device for estimating battery SOE according to an embodiment of the present invention；And
Fig. 6 is the structural block diagram of the device for estimating battery SOE of another embodiment according to the present invention.
Description of symbols
1, processor 2, memory
3, display 4, temperature sensor
5, current sensor
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to embodiment of the present invention.It should be understood that
Embodiment that the specific embodiments described herein are merely illustrative of the invention is not intended to restrict the invention implementation
Mode.
Fig. 1 is the flow chart of the method for estimating battery SOE according to an embodiment of the present invention.As shown in Figure 1, should
Method may include:
In step slo, the temperature of battery is detected.
In step s 11, the capacity of battery is calculated.Specifically, can according to the temperature of battery and the temperature prestored with
First corresponding relationship of battery capacity determines the capacity of battery at such a temperature.
In an embodiment of the invention, the capacity that polygometry calculates battery can be used, comprising:
The capacity of battery is calculated according to formula (1):
Wherein, y is the capacity of calculated battery, and x is the temperature of the battery detected, and x1 and x2 are respectively first corresponding
Two temperature values adjacent with temperature x in relationship, y1 and y2 are electricity corresponding with x1 and x2 respectively in first corresponding relationship
Pool capacity magnitude.
First corresponding relationship can be by testing the battery capacity under different temperatures before battery use, to obtain
Mode to temperature and the set of corresponding battery capacity obtains, and can be stored (such as it is stored in battery management system
In the Eeprom of (Battery Management System, BMS)).Fig. 2 shows the capacity that battery is calculated using polygometry.
As shown in Fig. 2, C point (x, y) be using the temperature of battery as the capacity of abscissa, battery be in coordinate system that ordinate is constituted one
Point, A (x1, y1) and B (x2 and y2) are two points adjacent with C point.The temperature x of known battery calculates C point according to formula (1)
Ordinate y (capacity of battery).In addition, those skilled in the art are it also will be understood that calculate the appearance of the battery using other methods
Amount is also to be applicable in.
In step s 12, the SOC of battery is determined.Specifically, the SOC of battery can be determined according to the capacity of battery.?
In present embodiment, current integration method can be used to determine SOC, but it will be appreciated by those skilled in the art that can also use
Other methods calculate SOC.
In step s 13, the open-circuit voltage of battery is calculated.It specifically, can be according to SOC and the SOC and battery that prestore
The second corresponding relationship of open-circuit voltage determine the open-circuit voltage of battery at the SOC.
In an embodiment of the invention, the open-circuit voltage that polygometry calculates battery can be used, comprising:
The open-circuit voltage of battery is calculated according to formula (2):
Wherein, VocFor the open-circuit voltage of calculated battery, SOC is determining in step s 12 SOC, SOC1 and SOC2
Two SOC values adjacent with SOC, V in respectively the second corresponding relationshipoc1And Voc2For in the second corresponding relationship respectively with SOC1 and
The open-circuit voltage values of the corresponding battery of SOC2.
Second corresponding relationship can be by detecting the battery open circuit voltage under different SOC, to obtain SOC and battery open circuit electricity
The mode of the set of pressure obtains, and can be stored (such as it is stored in battery management system (Battery Management
System, BMS) Eeprom in).Fig. 3 shows the open-circuit voltage that battery is calculated using polygometry.As shown in figure 3, D point
(SOC, Voc) it is using the SOC of battery as abscissa, the open-circuit voltage values V of batteryocOne in coordinate system constituted for ordinate
Point, E (SOC1, Voc1) and F (SOC2 and Voc2) it is two points adjacent with C point.The SOC value of known battery is counted according to formula (2)
Calculate the ordinate V of C pointoc(open-circuit voltage of battery).In addition, it will be appreciated by those skilled in the art that other methods can also be used
Calculate the open-circuit voltage of the battery.
In step S14, the SOE of battery is estimated.It specifically, can be according to battery capacity, open-circuit voltage and detection
To the electric current of battery estimate the SOE of battery.
In an embodiment of the invention, the SOE of the battery can be calculated using current integration method, comprising:
The SOE value of battery is estimated according to formula (3):
Wherein, C0For the rated capacity of battery, SOE (0) is the initial SOE value of battery, and SOE (t) is the battery estimated
SOE value, t be battery discharge time, i (t) be t time battery electric current, η be battery charging and discharging multiplying power impact factor,
VocIt (t) is the open-circuit voltage of t time, Voc(0) open-circuit voltage for battery when fully charged.In the present embodiment, the value of η can
1 is thought, it will be appreciated by those skilled in the art that there can be other values according to actual implementation η.In addition, those skilled in the art can
To understand that it is also applicable for calculating the SOE of the battery using other methods.
In an embodiment of the invention, battery may include battery pack, and battery pack may include multiple battery lists
Member.In this embodiment, the temperature that battery is detected in above-mentioned steps S10 may be implemented as the average temperature of detection battery pack
Degree.Fig. 4 is the flow chart of the method for the SOE for estimating battery according to an embodiment of the present invention, with use shown in FIG. 1
Unlike method in the SOE of estimation battery, step S10 shown in FIG. 1 is replaced by following steps, comprising:
In step S20, the temperature of each battery unit in multiple battery units is detected.
In the step s 21, the mean temperature of battery pack is calculated, i.e., according to the temperature computation of each battery unit detected
The mean temperature of multiple battery units.
Fig. 5 is the structural block diagram of the device of the SOE for estimating battery according to an embodiment of the present invention.Such as Fig. 5
It is shown, the apparatus may include: processor 1, memory 2 and display 3.
The memory 2 be used for such as described in embodiment of above the first corresponding relationship, the second corresponding relationship.It deposits
Reservoir 2 for example can be non-removable memory and/or removable memory.Non-removable memory may include arbitrary access
The memory storage apparatus of memory (RAM), read-only memory (ROM), hard disk or any other type.Removable memory
It may include subscriber identity module (SIM) card, memory stick, secure digital (SD) storage card etc..
Processor 1 can be used for for example executing the step in the method for estimating battery SOE in above embodiment
Part or all.
For example, processor 1 may be configured to:
Receive the temperature of the battery detected and the electric current of battery；
The appearance of battery at such a temperature is determined according to the first corresponding relationship of the capacity of temperature and the temperature and battery that prestore
Amount；
The SOC of battery is determined according to capacity；
The battery at the SOC is determined according to the second corresponding relationship of the open-circuit voltage of SOC and the SOC and battery that prestore
Open-circuit voltage；And
The SOE of battery is estimated according to the electric current of the capacity, the open-circuit voltage and battery.
Processor 1 can be general processor, application specific processor, conventional processors, digital signal processor (DSP), more
A microprocessor, one or more microprocessors associated with DSP core, controller, microcontroller, specific integrated circuit
(ASIC), field programmable gate array (FPGA) circuit, the integrated circuit (IC) of any other type, state machine etc..
Display 3 is displayed for the SOE value of battery.It is single that the display 3 may, for example, be liquid crystal display (LCD) display
Member or Organic Light Emitting Diode (OLED) display unit.
Fig. 6 is the structural block diagram of the device for estimating battery SOE of another embodiment according to the present invention.Such as Fig. 6
Shown, which can also include: temperature sensor 4 and current sensor 5.
The temperature sensor 4 is used to detect the temperature of battery.Temperature sensor 4 for example can be thermistor.In battery
It include in the embodiment of multiple battery units including battery pack and battery pack, temperature sensor 4 includes multiple temperature sensing
Device, each is used to detect the temperature of a battery unit in multiple battery units.Processor 1 is for receiving temperature sensor
The temperature of the battery unit of 4 detections and the mean temperature for calculating battery unit.
Current sensor 5 is used to detect the electric current of battery.Current sensor 5 for example can be Hall current sensor.
One embodiment of the present invention additionally provides a kind of computer readable storage medium, the computer readable storage medium
In be stored with instruction, the instruction for make when being executed by processor processor execute the above method the step of.
The solution of the present invention is corrected by detecting the temperature of battery based on SOE of the battery temperature factor to battery,
So that the estimation of SOE is more accurate.
The optional embodiment of example of the present invention is described in detail in conjunction with attached drawing above, still, embodiment of the present invention is not
The detail being limited in above embodiment can be to of the invention real in the range of the technology design of embodiment of the present invention
The technical solution for applying mode carries out a variety of simple variants, these simple variants belong to the protection scope of embodiment of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, embodiment of the present invention
To various combinations of possible ways, no further explanation will be given.
It will be appreciated by those skilled in the art that realizing that all or part of the steps in above embodiment method is can to lead to
Program is crossed to instruct relevant hardware and complete, which is stored in a storage medium, including some instructions use so that
The whole of one (can be single-chip microcontroller, chip etc.) or processor (processor) the execution each embodiment method of the application
Or part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey
The medium of sequence code.
In addition, any combination can also be carried out between a variety of different embodiments of embodiment of the present invention, as long as its
Without prejudice to the thought of embodiment of the present invention, embodiment of the present invention disclosure of that equally should be considered as.
Claims (10)
1. a kind of for estimating the method for battery power status SOE, the method includes detecting battery temperature, which is characterized in that
This method further include:
The electricity described at said temperatures is determined according to the first corresponding relationship of the capacity of the temperature and the temperature and battery that prestore
The capacity in pond；
The state-of-charge SOC of the battery is determined according to the capacity；
According to the second corresponding relationship of the open-circuit voltage of the SOC and the SOC and battery that prestore determine at the SOC described in
The open-circuit voltage of battery；And
The energy state SOE of the battery is estimated according to the electric current of the capacity, the open-circuit voltage and the battery.
2. the battery pack includes more the method according to claim 1, wherein the battery includes battery pack
A battery unit, the temperature for detecting battery include:
Detect the temperature of each battery unit in the multiple battery unit；
According to the mean temperature of the multiple battery unit of temperature computation of each battery unit detected.
3. the method according to claim 1, wherein the temperature that the basis detects and the temperature and electricity that prestore
First corresponding relationship of the capacity in pond determines that the capacity of the battery described at said temperatures includes:
The capacity is calculated using polygometry.
4. according to the method described in claim 3, it is characterized in that, described calculated the capacity and included: using polygometry
The capacity of the battery is calculated according to formula (1):
Wherein, y is the calculated capacity, and x is the temperature detected, and x1 and x2 are respectively first corresponding relationship
In two temperature values adjacent with the temperature x, y1 and y2 are electricity corresponding with x1 and x2 respectively in first corresponding relationship
Pool capacity magnitude.
5. the method according to claim 1, wherein the opening according to the SOC and SOC prestored and battery
Second corresponding relationship of road voltage determines that the open-circuit voltage of the battery at the SOC includes:
The open-circuit voltage of the battery is calculated using polygometry.
6. according to the method described in claim 5, it is characterized in that, the open circuit for calculating the battery using polygometry
Voltage includes:
The open-circuit voltage of the battery is calculated according to formula (2):
Wherein, VocFor the open-circuit voltage of the calculated battery, SOC is that the SOC, SOC1 and SOC2 are respectively described second
Two SOC values adjacent with the SOC, V in corresponding relationshipoc1And Voc2For in second corresponding relationship respectively with SOC1 and
The open-circuit voltage values of the corresponding battery of SOC2.
7. the method according to claim 1, wherein described according to the capacity, the open-circuit voltage and institute
The electric current of battery is stated to determine that the energy state SOE of the battery includes:
The SOE value of the battery is estimated using current integration method.
8. the method according to the description of claim 7 is characterized in that the SOE for estimating the battery using current integration method
Value includes:
The SOE value of the battery is estimated according to formula (3):
Wherein, C0For the rated capacity of the battery, SOE (0) is the initial SOE value of the battery, and SOE (t) is the institute that estimates
The SOE value of battery is stated, t is the discharge time of the battery, and i (t) is the electric current in the battery of t time, and η is the battery
The impact factor of charge-discharge magnification, VocIt (t) is the open-circuit voltage in the t time, VocIt (0) is when the battery is fully charged
Open-circuit voltage.
9. according to the method described in claim 8, it is characterized in that, the value of the η is 1.
10. a kind of computer readable storage medium, which is characterized in that instruction is stored in the computer readable storage medium,
Described instruction is as claimed in any of claims 1 to 9 for executing the processor
Method for estimating battery power status SOE.
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