CN107015166A - Method and computer-readable recording medium for estimating battery power status - Google Patents
Method and computer-readable recording medium for estimating battery power status Download PDFInfo
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- CN107015166A CN107015166A CN201710477836.4A CN201710477836A CN107015166A CN 107015166 A CN107015166 A CN 107015166A CN 201710477836 A CN201710477836 A CN 201710477836A CN 107015166 A CN107015166 A CN 107015166A
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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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- General Physics & Mathematics (AREA)
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- Tests Of Electric Status Of Batteries (AREA)
Abstract
Embodiment of the present invention provides a kind of method and computer-readable recording medium for being used to estimate battery SOE, belongs to Cell Evaluation field.This method includes：Detect the temperature of battery；The capacity of battery at such a temperature is determined according to the first corresponding relation of the temperature and the temperature prestored and the capacity of battery；The SOC of battery is determined according to battery capacity；The open-circuit voltage of the battery under the SOC of battery is determined according to the second corresponding relation of the SOC of battery and the SOC prestored and the open-circuit voltage of battery；And the energy state SOE of battery is estimated according to the electric current of the capacity, open-circuit voltage and battery of battery.This method and storage medium can be corrected by detecting the temperature of battery to SOE so that SOE estimation is more accurate.
Description
Technical field
The present invention relates to Cell Evaluation field, more particularly to a kind of method and calculating for being used to estimate battery power status
Machine readable storage medium storing program for executing.
Background technology
Influenceed by energy crisis and environmental crisis, electric automobile has obtained development quickly.For electric automobile,
Estimation to course continuation mileage is a problem.Conventional lithium battery charge state (State of Charge, SOC) is come to it at present
Course continuation mileage is judged, but the mileage that SOC continues a journey with electric automobile does not change linearly, in battery discharge latter stage, SOC
Change will fast mistake can course continuation mileage, the erroneous judgement which results in user to electric automobile course continuation mileage.
Lithium battery energy state (State of Energy, SOE) is closely related with electric automobile course continuation mileage, uses SOE generations
Course continuation mileage, which is done, for SOC judges it is a kind of better way.Carried out at normal temperatures more than lithium battery state estimation, often set battery
Parameter be steady state value.But in electric automobile actual moving process, seasonal variations can cause lithium battery use environment temperature
Change, especially in northern area, this change is particularly evident, and the characterisitic parameter such as the capacity of lithium battery and internal resistance can be with temperature
The change of degree and show larger difference, which results in the inaccurate of the algorithm of lithium battery state estimation.
The content of the invention
The purpose of embodiment of the present invention is to provide a kind of method for being used to estimate battery power status and computer-readable
Storage medium, this method and computer-readable recording medium can be corrected by detecting the temperature of battery to SOE so that
SOE estimation is more accurate.
To achieve these goals, on the one hand embodiment of the present invention provides a kind of side for being used to estimate battery power status
Method, this method includes：
Detect the temperature of battery；
Determined according to the first corresponding relation of the temperature of battery and the temperature prestored and the capacity of battery electric at such a temperature
The capacity in pond；
The SOC of battery is determined according to the capacity；
Determined according to the second corresponding relation of the SOC of the battery and the SOC prestored and the open-circuit voltage of battery under the SOC
Battery open-circuit voltage；And
The SOE of battery is estimated according to the electric current of the capacity, open-circuit voltage and battery.
Alternatively, the battery includes battery pack, and the battery pack includes multiple battery units, and the temperature of detection battery can be wrapped
Include：Detect 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.
Alternatively, determined according to the first corresponding relation of the temperature detected and the capacity of the temperature prestored and battery at this
At a temperature of the capacity of battery can include：The capacity is calculated using polygometry.
Alternatively, calculating the capacity using polygometry can include：
The capacity of battery is calculated according to formula (1)：
Wherein, y is the capacity of the battery calculated, and x is the temperature of the battery detected, and x1 and x2 are respectively the first correspondence
Two temperature values adjacent with temperature x in relation, y1 and y2 are battery corresponding with x1 and x2 respectively in the first corresponding relation
Capability value.
Alternatively, determined according to the second corresponding relation of the SOC and the SOC prestored and the open-circuit voltage of battery in the SOC
Under the open-circuit voltage of battery can include：The open-circuit voltage of battery is calculated using polygometry.
Alternatively, the open-circuit voltage for calculating battery using polygometry can include：
The open-circuit voltage of battery is calculated according to formula (2)：
Wherein, VocFor the open-circuit voltage of the battery calculated, SOC is respectively second for SOC, SOC1 and the SOC2 of the battery
Two SOC values adjacent with SOC, V in corresponding relationoc1And Voc2To be corresponding with SOC1 and SOC2 respectively in the second corresponding relation
The open-circuit voltage values of battery.
Alternatively, determine that the energy state SOE of battery can according to the electric current of the capacity, open-circuit voltage and battery of battery
With including：The SOE values of battery are estimated using current integration method.
Alternatively, the SOE values for estimating battery using current integration method can include：
The SOE values of battery are estimated according to formula (3)：
Wherein, C0For the rated capacity of battery, SOE (0) is the initial SOE values of battery, and SOE (t) is the battery estimated
SOE values, t be battery discharge time, i (t) be the t times battery electric current, η for battery charging and discharging multiplying power influence because
Son, Voc(t) it is open-circuit voltage, Voc(0) open-circuit voltage for battery when fully charged.
Alternatively, 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 recording medium, and this is computer-readable to deposit
Be stored with instruction in storage media, the instruction be used for when being executed by processor so that computing device it is above-mentioned be used for estimate battery
Part or all of SOE method and step.
By above-mentioned technical proposal, provided by the present invention for estimating the method for battery power status and computer-readable depositing
Storage media can be corrected according to the temperature of battery to SOE so that SOE estimation is more accurate.
The further feature and advantage of embodiment of the present invention will be described in detail in subsequent embodiment part.
Brief description of the drawings
Accompanying drawing is that embodiment of the present invention is further understood for providing, and constitutes a part for specification, with
Following embodiment is used to explain embodiment of the present invention together, but does not constitute the limit to embodiment of the present invention
System.In the accompanying drawings：
Fig. 1 is the flow chart for being used to estimate battery SOE method 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 for being used to estimate battery SOE method according to an embodiment of the present invention；
Fig. 5 is the structured flowchart for being used to estimate battery SOE device according to an embodiment of the present invention；And
Fig. 6 is the structured flowchart for being used to estimate battery SOE device according to another embodiment of the present invention.
Description of reference numerals
1st, processor 2, memory
3rd, display 4, temperature sensor
5th, current sensor
Embodiment
The embodiment of embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that
Embodiment described herein is merely to illustrate and explain the present invention embodiment, is not intended to limit the invention implementation
Mode.
Fig. 1 is the flow chart for being used to estimate battery SOE method according to an embodiment of the present invention.As shown in figure 1, should
Method can 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 relation of battery capacity determines the capacity of battery at such a temperature.
In an embodiment of the invention, polygometry can be used to calculate the capacity of battery, including：
The capacity of battery is calculated according to formula (1)：
Wherein, y is the capacity of the battery calculated, and x is the temperature of the battery detected, and x1 and x2 are respectively the first correspondence
Two temperature values adjacent with temperature x in relation, y1 and y2 are electricity corresponding with x1 and x2 respectively in first corresponding relation
Tankage value.
First corresponding relation can be tested by the battery capacity under different temperatures before battery use, with
Mode to the set of temperature and correspondence battery capacity is obtained, and (can for example be stored in battery management system by storing
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 points (x, y) for by abscissa of the temperature of battery, the capacity of battery be in the coordinate system that ordinate is constituted one
Point, A (x1, y1) and B (x2 and y2) are two points adjacent with C points.The temperature x of known battery, C points are calculated 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 method
Amount is also applicable.
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 method calculates SOC.
In step s 13, the open-circuit voltage of battery is calculated.Specifically, can be according to SOC and the SOC and battery that prestore
The second corresponding relation of open-circuit voltage determine the open-circuit voltage of battery under the SOC.
In an embodiment of the invention, polygometry can be used to calculate the open-circuit voltage of battery, including：
The open-circuit voltage of battery is calculated according to formula (2)：
Wherein, VocFor the open-circuit voltage of the battery calculated, SOC is SOC, SOC1 and the SOC2 determined in step s 12
Two SOC values adjacent with SOC, V in respectively the second corresponding relationoc1And Voc2For in the second corresponding relation respectively with SOC1 and
The open-circuit voltage values of the corresponding batteries of SOC2.
Second corresponding relation 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 is obtained, and can be stored and (be for example 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 points
(SOC, Voc) be by abscissa of the SOC of battery, the open-circuit voltage values V of batteryocOne in the coordinate system constituted for ordinate
Point, E (SOC1, Voc1) and F (SOC2 and Voc2) it is two points adjacent with C points.The SOC value of known battery, is counted according to formula (2)
Calculate the ordinate V of C pointsoc(open-circuit voltage of battery).In addition, it will be appreciated by those skilled in the art that other method can also be used
Calculate the open-circuit voltage of the battery.
In step S14, the SOE of battery is estimated.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, including：
The SOE values of battery are estimated according to formula (3)：
Wherein, C0For the rated capacity of battery, SOE (0) is the initial SOE values of battery, and SOE (t) is the battery estimated
SOE values, t be battery discharge time, i (t) be t time batteries electric current, η be battery charging and discharging multiplying power factor of influence,
Voc(t) it is the open-circuit voltage of t times, Voc(0) open-circuit voltage for battery when fully charged.In the present embodiment, η value can
1 is thought, it will be appreciated by those skilled in the art that there can be other values according to the actual η that implements.In addition, those skilled in the art can
To understand that the SOE for using other method to calculate the battery is also applicable.
In an embodiment of the invention, battery can include battery pack, and battery pack can include multiple battery lists
Member.In this embodiment, detect that the temperature of battery may be implemented as detecting the average temperature of battery pack in above-mentioned steps S10
Degree.Fig. 4 is the flow chart for being used to estimate the SOE of battery method according to an embodiment of the present invention, with the use shown in Fig. 1
Unlike method in the SOE of estimation battery, the step S10 shown in Fig. 1 is replaced by following steps, including：
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 structured flowchart for being used to estimate the SOE of battery device according to an embodiment of the present invention.Such as Fig. 5
Shown, the device can include：Processor 1, memory 2 and display 3.
The memory 2 is used for such as the first corresponding relation described in embodiment of above, the second corresponding relation.Deposit
Reservoir 2 for example can be non-removable memory and/or removable memory.Non-removable memory can include arbitrary access
Memory (RAM), read-only storage (ROM), the memory storage apparatus of hard disk or any other type.Removable memory
Subscriber identity module (SIM) card, memory stick, secure digital (SD) storage card etc. can be included.
Processor 1 can be used for for example performing the step in the method for estimating battery SOE in above-mentioned embodiment
Part or all.
For example, processor 1 may be configured to：
Receive the temperature and the electric current of battery of the battery detected；
The appearance of battery at such a temperature is determined according to the first corresponding relation of temperature and the temperature prestored and the capacity of battery
Amount；
The SOC of battery is determined according to capacity；
Battery under the SOC is determined according to the second corresponding relation of SOC and the SOC prestored and the open-circuit voltage of battery
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), many
Individual microprocessor, the one or more microprocessors associated with DSP core, controller, microcontroller, application specific integrated circuit
(ASIC), field programmable gate array (FPGA) circuit, integrated circuit (IC), the state machine of any other type etc..
Display 3 is displayed for the SOE values 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 structured flowchart for being used to estimate battery SOE device according to another embodiment of the present invention.Such as Fig. 6
Shown, the device can also include：Temperature sensor 4 and current sensor 5.
The temperature sensor 4 is used for the temperature for detecting battery.Temperature sensor 4 for example can be thermistor.In battery
Include including battery pack and battery pack in the embodiment of multiple battery units, temperature sensor 4 includes multiple TEMPs
Device, each is used for the temperature for detecting a battery unit in multiple battery units.Processor 1 is used to receive temperature sensor
The temperature of the battery unit of 4 detections and the mean temperature for calculating battery unit.
Current sensor 5 is used for the electric current for detecting battery.Current sensor 5 for example can be Hall current sensor.
One embodiment of the present invention additionally provides a kind of computer-readable recording medium, the computer-readable recording medium
In be stored with instruction, the instruction is used for when being executed by processor so that the step of the computing device above method.
The solution of the present invention is corrected by detecting the temperature of battery based on battery temperature factor to the SOE of battery,
So that SOE estimation is more accurate.
The optional embodiment of example of the present invention is described in detail above in association with accompanying drawing, still, embodiment of the present invention is not
It is limited to the detail in above-mentioned embodiment, can be to of the invention real in the range of the technology design of embodiment of the present invention
The technical scheme for applying mode carries out a variety of simple variants, and these simple variants belong to the protection domain of embodiment of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, embodiment of the present invention
Various possible combinations are no longer separately illustrated.
It will be appreciated by those skilled in the art that realizing that all or part of step in above-mentioned embodiment method is to lead to
Cross program to instruct the hardware of correlation to complete, the program storage is in a storage medium, including some instructions are to cause
One (can be single-chip microcomputer, chip etc.) or processor (processor) perform the whole of each embodiment method of the application
Or part steps.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
In addition, can also be combined between a variety of embodiments of embodiment of the present invention, as long as its
Without prejudice to the thought of embodiment of the present invention, it should equally be considered as embodiment of the present invention disclosure of that.
Claims (10)
1. a kind of method for being used to estimate battery power status SOE, it is characterised in that this method includes：
Detect the temperature of battery；
The electricity at said temperatures is determined according to the first corresponding relation of the temperature and the temperature prestored and the capacity of battery
The capacity in pond；
The state-of-charge SOC of the battery is determined according to the capacity；
According to determining under the SOC the second corresponding relation of the SOC and the SOC prestored and the open-circuit voltage of battery
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. according to the method described in claim 1, it is characterised in that the battery includes battery pack, the battery pack includes many
Individual battery unit, the temperature of the detection battery includes：
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. according to the method described in claim 1, it is characterised in that temperature that the basis is detected and the temperature and electricity that prestore
First corresponding relation of the capacity in pond determines that the capacity of the battery at said temperatures includes：
The capacity is calculated using polygometry.
4. method according to claim 3, it is characterised in that the use polygometry, which calculates the capacity, to be included：
The capacity of the battery is calculated according to formula (1)：
Wherein, y is the capacity calculated, and x is the temperature detected, and x1 and x2 are respectively first corresponding relation
In two temperature values adjacent with the temperature x, y1 and y2 are electricity corresponding with x1 and x2 respectively in first corresponding relation
Tankage value.
5. according to the method described in claim 1, it is characterised in that the opening according to the SOC and SOC prestored and battery
Second corresponding relation of road voltage determines that the open-circuit voltage of the battery under the SOC includes：
The open-circuit voltage of the battery is calculated using polygometry.
6. method according to claim 5, it is characterised in that the use polygometry calculates the open circuit of the battery
Voltage includes：
The open-circuit voltage of the battery is calculated according to formula (2)：
Wherein, VocFor the open-circuit voltage of the battery calculated, SOC is that the SOC, SOC1 and SOC2 are respectively described second
Two SOC values adjacent with the SOC, V in corresponding relationoc1And Voc2For in second corresponding relation respectively with SOC1 and
The open-circuit voltage values of the corresponding batteries of SOC2.
7. according to the method described in claim 1, it is characterised in that 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 values of the battery are estimated using current integration method.
8. method according to claim 7, it is characterised in that the use current integration method estimates the SOE of the battery
Value includes：
The SOE values of the battery are estimated according to formula (3)：
Wherein, C0For the rated capacity of the battery, SOE (0) is the initial SOE values of the battery, and SOE (t) is the institute that estimates
The SOE values of battery are stated, t is the discharge time of the battery, and i (t) is the electric current in the battery of t times, and η is the battery
The factor of influence of charge-discharge magnification, Voc(t) it is the open-circuit voltage in the t times, Voc(0) it is when the battery is fully charged
Open-circuit voltage.
9. method according to claim 8, it is characterised in that the value of the η is 1.
10. a kind of computer-readable recording medium, it is characterised in that be stored with instruction in the computer-readable recording medium,
It is described to instruct when being used to be executed by processor so that the computing device is as claimed in any of claims 1 to 9
Method for estimating battery power status SOE.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109342967A (en) * | 2018-09-26 | 2019-02-15 | 合肥国轩高科动力能源有限公司 | Estimation method for low-temperature available energy of power lithium ion battery pack |
| CN109507599A (en) * | 2017-09-12 | 2019-03-22 | 北京奔驰汽车有限公司 | A kind of optimization algorithm of power battery SOE |
| CN110231577A (en) * | 2019-06-14 | 2019-09-13 | 安徽锐能科技有限公司 | A kind of SOE estimation device for mending electric-type active equalization based on battery |
| CN110231580A (en) * | 2019-06-14 | 2019-09-13 | 安徽锐能科技有限公司 | It is a kind of based on battery balanced SOE estimation device |
| CN110231575A (en) * | 2019-06-14 | 2019-09-13 | 安徽锐能科技有限公司 | It is a kind of based on battery balanced SOE estimation method and computer readable storage medium |
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| CN110231576A (en) * | 2019-06-14 | 2019-09-13 | 安徽锐能科技有限公司 | A kind of SOE estimation method for mending electric-type active equalization based on battery |
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| CN111257761A (en) * | 2020-03-01 | 2020-06-09 | 盐城工学院 | Lithium battery SOC estimation method and system based on thermodynamic model |
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| CN112800579A (en) * | 2020-12-29 | 2021-05-14 | 上海卫星工程研究所 | Complementary filter-based satellite storage battery electric quantity estimation method and system |
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