CN106950501B - A kind of remaining capacity calculation method of Li-ion batteries piles - Google Patents
A kind of remaining capacity calculation method of Li-ion batteries piles Download PDFInfo
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- CN106950501B CN106950501B CN201710137847.8A CN201710137847A CN106950501B CN 106950501 B CN106950501 B CN 106950501B CN 201710137847 A CN201710137847 A CN 201710137847A CN 106950501 B CN106950501 B CN 106950501B
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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
Abstract
The invention discloses a kind of remaining capacity calculation methods of Li-ion batteries piles, its remaining capacity value is expressed using percent wise, the calculation method of residual capacity uses voltage look-up table, voltage value for tabling look-up is derived from the minimum voltage of single battery in battery pack, and the minimum voltage is tabled look-up after excess temperature and current compensation calculate to obtain residual capacity percent value.The present invention, which is realized, to be calculated containing single or multiple battery cells Li-ion batteries piles in series with the residual capacity percent value of temperature and current compensation correction, the accurate calculating of battery pack residual capacity under the conditions of different temperatures and different loads is helped to realize, and method is simple.
Description
Technical field
The present invention relates to a kind of calculating of the remaining capacity of technical field of lithium ion more particularly to Li-ion batteries piles
Method.
Background technique
In various electronic products, the power supply there are many product is powered by Li-ion batteries piles, typical such as notebook
Computer and tablet computer further include electric bicycle, electrodynamic balance vehicle, communication backup battery group etc., these lithium ion batteries
Group requires electric quantity metering function, to show residual power percentage in equipment.Common electricity calculation method in the market
There are a voltage look-up table and coulomb calculating method, but battery pack is when different temperatures and different loads current conditions are discharged, capacity
Value is a changing value, and the error that this will lead to residual capacity calculating is larger.There are also use Kalman filtering algorithm and resistance in the market
The electricity calculating method of anti-tracing, but calculate complicated, higher cost.
In the market in existing lithium ion battery remaining capacity calculation method, in different temperatures and different loads current conditions
Under residual capacity accounting do not calculate accurately really, the higher cost of some methods, and these algorithms are the electricity for entire battery pack
Amount is calculated, when thering is the service life of a battery core to occur deteriorating in battery pack or capacity reduces suddenly because of certain reason,
These methods very big error will occur to the electricity calculating of battery pack, to influence to use.
Summary of the invention
It is simple, practical it is an object of the invention to provide a kind of algorithm in place of overcoming the deficiencies in the prior art described above
The remaining capacity calculation method of Li-ion batteries piles.
The present invention realizes in the following way:
A kind of remaining capacity calculation method of Li-ion batteries piles, it is characterised in that: 1), will at 20 DEG C~30 DEG C
Single battery be full of after with 10 hours multiplying power current discharges, record the voltage and discharge capacity value homologous thread when battery discharge；
Voltage value corresponding to the every residual capacity percent value by 1% variation of single battery is generated one two after the completion of electric discharge
Dimension table, the longitudinal axis are voltage value, and horizontal axis is remaining capacity value, share 100 data points；Multiple single batteries can be taken to be tried
It tests, voltage value in bivariate table that all single batteries are tested is weighted after being averaged as voltage and remaining
Volume percent value base table；
2) single battery is chosen 90 and be completely filled with；Each single battery is pressed into different temperatures and different current bars again
It discharging under part, temperature values are -20 DEG C~60 DEG C, it is average that a temperature spot is taken every 10 DEG C, share 9 temperature spots；
Current value range is 0.2C~2C, average to take a current point every 0.2C, totally 10 current points, after temperature and currents combination altogether
There are 90 different conditions, it is corresponding with discharge capacity value bent to record the voltage of every single battery during discharge under different condition
Line, every battery is every by one bivariate table of generation of voltage value corresponding to 1% residual capacity changing value, and the longitudinal axis is voltage
Value, horizontal axis be residual capacity percent value, totally 100 points；One shares the electric discharge recording under 90 different conditions, obtains 90 differences
Under the conditions of residual capacity percent value and the voltage table of comparisons；
3) the 1st table in 90 residual capacity percent values and the voltage table of comparisons for taking step 2) to obtain, will be in the table
The corresponding voltage value of each residual capacity percent value point takes out, with voltage obtained in step 1) and residual capacity percentage
It is worth voltage value corresponding to each residual capacity percent value point of base table and carries out division arithmetic, each residual capacity point can obtains
To a numerical value, 100 residual capacity points one are met together to obtain 100 numerical value, 100 numerical value are averaged, and obtain this table institute
The coefficient value K1 of generation；
4) remaining 89 residual capacity percent values are also calculated by the method for step 3) with the voltage table of comparisons, often
It opens table and all obtains a coefficient value, totally 90 coefficient values, be K1~K90；K1~K90 is formed into a temperature current coefficient table,
Wherein the longitudinal axis is temperature value, and horizontal axis is current value；
5) when practical application, by the battery management systems of Li-ion batteries piles to battery pack current, environment temperature, each
The voltage of single battery measures, and the battery pack current size arrived according to actual measurement and ambient temperature value, inquiry obtain
Closest to the coefficient value Kn of actual temperature and electric current, by the minimum voltage value of single battery in the battery pack measured divided by coefficient
Value Kn compensates calculating, obtains voltage value V, is tabled look-up with the table that voltage value V is obtained in step 1), search closest to
Residual capacity percent value corresponding to the voltage of the voltage value is then the battery pack residual capacity percent value.
The beneficial effects of the present invention are: it, can be relatively accurately under different temperatures and different loads current conditions
Judge the real surplus capacity of Li-ion batteries piles, and its judgment mode is for remaining capacity value in series-connected cell group
The smallest single battery is judged, can more really judge the actually available capacity of battery pack.
Specific embodiment
The specific embodiment of the invention is now described in detail:
A kind of remaining capacity calculation method of Li-ion batteries piles, it is characterised in that: specific as follows:
1), at 20 DEG C~30 DEG C, the single battery of model used in Li-ion batteries piles is chosen several and complete
It is full of entirely, then these single batteries was discharged with 10 hours discharge-rate electric currents, and record battery in electric discharge times in 10 hours
The capacity data curve of voltage and releasing when rate current discharge；By the every remaining appearance by 1% variation of every tested battery
The voltage value that magnitude is compareed generates a bivariate table, and the longitudinal axis is voltage value, and horizontal axis is remaining capacity value, shares 100 data
Point；Voltage value in bivariate table that all single batteries are tested is weighted after being averaged as voltage and remaining
Volume percent value base table, as shown in Table 1:
Table one:
One voltage of table and the basic table of comparisons of remaining capacity value
2) single battery of model used in Li-ion batteries piles, is chosen 90 and is completely filled with；Again by each monomer electricity
By discharging under different temperatures and different current conditions, temperature values are -20 DEG C~60 DEG C, average to take one every 10 DEG C in pond
A temperature spot shares 9 temperature spots；Current value range is 0.2C~2C, average to take a current point every 0.2C, totally 10 electricity
90 different conditions are shared after flow point, temperature and currents combination, record the electricity of every battery during discharge under different condition
Pressure and the capability value data and curves released, the voltage value that the every remaining capacity value by 1% variation of every battery is compareed are raw
At a bivariate table, the longitudinal axis is voltage value, and horizontal axis is remaining capacity value, totally 100 points；One shares the electric discharge under 90 different conditions
Record obtains the residual capacity and the voltage table of comparisons under 90 different conditions；
3) the 1st table in 90 residual capacities and the voltage table of comparisons for, taking step 2) to obtain is (assuming that the table is -20 DEG C
Temperature 0.2C discharge current), the corresponding voltage value of residual capacity point each in the table is taken out, with electricity obtained in step 1)
Voltage value corresponding to each residual capacity point of the pressure with residual capacity percent value base table carries out division arithmetic, each residue
Capacity point can obtain a numerical value, and 100 residual capacity points one are met together to obtain 100 numerical value, 100 numerical value are averaged, are obtained
To coefficient value K1 caused by this table；
Such as: the corresponding voltage of 1% capability value point is 3.1V in the table, and 3.283V corresponding in base table 1% is divided by,
Obtained value is 0.944, then the corresponding voltage of 2% capability value is divided by, and obtains the 2nd value ... and so on, is obtained 100
A numerical value, is then averaged, and obtained K1 value is 0.933；
4), remaining 89 residual capacities are also calculated by the method for step 3) with the voltage table of comparisons, every table is all
A coefficient value is obtained, totally 90 coefficient values, is K1~K90；K1~K90 is formed into a temperature current coefficient table, wherein indulging
Axis is temperature value, and horizontal axis is current value, as shown in Table 2:
| 0.2C | 0.4C | 0.6C | 0.8C | 1C | 1.2C | 1.4C | 1.6C | 1.8C | 2C | |
| -20℃ | K1 | K2 | K3 | K4 | K5 | K6 | K7 | K8 | K9 | K10 |
| -10℃ | K11 | K12 | K13 | K14 | K15 | K16 | K17 | K18 | K19 | K20 |
| 0℃ | K21 | K22 | K23 | K24 | K25 | K26 | K27 | K28 | K29 | K30 |
| 10℃ | K31 | K32 | K33 | K34 | K35 | K36 | K37 | K38 | K39 | K40 |
| 20℃ | K41 | K42 | K43 | K44 | K45 | K46 | K47 | K48 | K49 | K50 |
| 30℃ | K51 | K52 | K53 | K54 | K55 | K56 | K57 | K58 | K59 | K60 |
| 40℃ | K61 | K62 | K63 | K64 | K65 | K66 | K67 | K68 | K69 | K70 |
| 50℃ | K71 | K72 | K73 | K74 | K75 | K76 | K77 | K78 | K79 | K80 |
| 60℃ | K81 | K82 | K83 | K84 | K85 | K86 | K87 | K88 | K89 | K90 |
Two temperature current coefficient table of table
5), when practical application, by the battery management systems of Li-ion batteries piles to battery pack current, environment temperature, every
The voltage of a single battery measures, and the battery pack current size and ambient temperature value arrived according to actual measurement, inquires
To the coefficient value Kn closest to actual temperature and electric current, for example, temperature is 43 DEG C, discharge current 0.38C, then it can be by table two
It is K62 (40 DEG C, corresponding to 0.4C) that middle inquiry, which obtains immediate coefficient value Kn, by single battery in the battery pack measured
Minimum voltage value obtains a compensated voltage value V divided by coefficient value Kn, and voltage value V tables look-up in Table 1, searches
Remaining capacity value corresponding to voltage closest to the voltage value is then the percent value of the battery pack residual capacity.For example,
The minimum voltage value of single battery is 3.85V, temperature coefficient value Kn=0.97, then compensated voltage in the battery pack measured
3.97V is corresponded to table one and inquired by value V=3.85V/0.97=3.97V, and obtaining the immediate value of the voltage is 3.971, corresponding
81%；It can learn that the residual capacity percent value of battery pack at this time is 81%.
Claims (1)
1. a kind of remaining capacity calculation method of Li-ion batteries piles, it is characterised in that: 1), will be single at 20 DEG C~30 DEG C
Body battery be full of after with 10 hours multiplying power current discharges, record the voltage and discharge capacity value homologous thread when battery discharge；?
Voltage value corresponding to the every residual capacity percent value by 1% variation of single battery is generated into a two dimension after the completion of electric discharge
Table, the longitudinal axis are voltage value, and horizontal axis is remaining capacity value, share 100 data points；Multiple single batteries can be taken to be tested,
Voltage value in bivariate table that all single batteries are tested is weighted after being averaged as voltage and remaining is held
Measure percent value base table；
2) single battery is chosen 90 and be completely filled with；Again by each single battery by under different temperatures and different current conditions
It discharging, temperature values are -20 DEG C~60 DEG C, it is average that a temperature spot is taken every 10 DEG C, share 9 temperature spots；Electric current
Value range is 0.2C~2C, average to take a current point every 0.2C, totally 10 current points, shares 90 after temperature and currents combination
A different condition records the voltage of every single battery during discharge and discharge capacity value homologous thread under different condition,
Every battery is every by one bivariate table of generation of voltage value corresponding to 1% residual capacity changing value, and the longitudinal axis is voltage value, horizontal
Axis be residual capacity percent value, totally 100 points；One shares the electric discharge recording under 90 different conditions, obtains 90 different conditions
Under residual capacity percent value and the voltage table of comparisons；
3) the 1st table in 90 residual capacity percent values and the voltage table of comparisons for taking step 2) to obtain, will be each in the table
The corresponding voltage value of residual capacity percent value point takes out, with voltage obtained in step 1) and residual capacity percent value base
Voltage value corresponding to each residual capacity percent value point of this table carries out division arithmetic, and each residual capacity point can obtain one
A numerical value, 100 residual capacity points one are met together to obtain 100 numerical value, 100 numerical value are averaged, are obtained produced by this table
Coefficient value K1；
4) remaining 89 residual capacity percent values are also calculated by the method for step 3) with the voltage table of comparisons, every table
A coefficient value is all obtained, totally 90 coefficient values, is K1~K90；K1~K90 is formed into a temperature current coefficient table, wherein
The longitudinal axis is temperature value, and horizontal axis is current value；
5) when practical application, by the battery management system of Li-ion batteries piles to battery pack current, environment temperature, each monomer
The voltage of battery measures, and the battery pack current size and ambient temperature value arrived according to actual measurement, and inquiry is most connect
The coefficient value Kn of nearly actual temperature and electric current, by the minimum voltage value of single battery in the battery pack measured divided by coefficient value Kn
Calculating is compensated, voltage value V is obtained, is tabled look-up with the table that voltage value V is obtained in step 1), is searched closest to the electricity
Residual capacity percent value corresponding to the voltage of pressure value is then the battery pack residual capacity percent value.
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| CN108535652B (en) * | 2018-02-07 | 2020-11-03 | 丽水博远科技有限公司 | Method for measuring residual capacity of rechargeable battery based on charging response |
| CN109407005B (en) * | 2018-09-14 | 2020-11-10 | 昆兰新能源技术常州有限公司 | Dynamic and static correction method for residual electric quantity of energy storage battery |
| CN113238154A (en) * | 2021-03-02 | 2021-08-10 | 翱捷科技股份有限公司 | Method and system for measuring residual electric quantity of battery based on coulometer |
| CN113552015B (en) * | 2021-06-24 | 2023-03-24 | 武汉昊诚锂电科技股份有限公司 | Method and device for analyzing residual lithium capacity of battery |
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