CN110221218A - Calculate the method and apparatus and machine readable storage medium of the SOC of battery - Google Patents
Calculate the method and apparatus and machine readable storage medium of the SOC of battery Download PDFInfo
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- CN110221218A CN110221218A CN201910580072.0A CN201910580072A CN110221218A CN 110221218 A CN110221218 A CN 110221218A CN 201910580072 A CN201910580072 A CN 201910580072A CN 110221218 A CN110221218 A CN 110221218A
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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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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Abstract
The present invention relates to battery technology fields, provide the method and apparatus and machine readable storage medium of a kind of SOC for calculating battery, the method: determine the temperature and electric current of the battery；The temperature and the corresponding capacity coefficient of the electric current are determined based on default corresponding relationship；And the SOC of the battery is determined based on presetting method and the capacity coefficient.The method and apparatus and machine readable storage medium of the SOC of the present invention for calculating battery, which are realized, takes into account the influence of electric current when calculating the SOC of battery, improves the accuracy for calculating the SOC of battery.
Description
Technical field
The present invention relates to battery technology field, in particular to the method and apparatus and machine of a kind of SOC for calculating battery can
Read storage medium.
Background technique
Currently, the currently available energy of ternary lithium battery pack is related according to current remaining capacity, and battery pack residue is held
Amount is shown according to battery pack SOC (residual capacity/total capacity).SOC is a weight to the assessment of battery current energy state
Parameter is wanted, is of great significance to the safe and efficient use of battery pack.
The estimation strategy of the SOC of ternary lithium is mainly that (electric current is in time with temperature-capacity Ah integral currently on the market
Integral) based on.This scheme only takes into account the influence to battery chemistries reaction when temperature changes, and ignores current versus cell chemistry
It is very big to influence same influence.Moreover electric current can also impact the voltage platform of battery, and electric current gets over the electric discharge of big battery
Voltage platform is smaller, shows as the reduction of the capacity of battery.
Summary of the invention
In view of this, the present invention is directed to propose the method and apparatus and machine readable storage of a kind of SOC for calculating battery are situated between
Matter is taken into account the influence of electric current when calculating the SOC of battery with realizing.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
One aspect of the present invention provides the method for SOC for calculating battery a kind of, the method: determines the temperature of the battery
Degree and electric current；The temperature and the corresponding capacity coefficient of the electric current are determined based on default corresponding relationship；And based on default side
Method and the capacity coefficient determine the SOC of the battery.
Further, the default corresponding relationship is determined based on the following contents: measurement is first default when the temperature
First total capacity of temperature, the electric current battery when being predetermined current；Measurement is the described first default temperature when the temperature
Second total capacity of degree, the electric current battery when being other electric currents different from the predetermined current；It is total by described second
Capacity and first total capacity, which compare, determines first preset temperature and other different from the predetermined current
The corresponding capacity coefficient of electric current；Based on determination first preset temperature and other different from the predetermined current
The content of the corresponding capacity coefficient of electric current determines other temperature for being different from first preset temperature and described is different from
The corresponding capacity coefficient of other electric currents of the predetermined current；And based on the capacity coefficient and the temperature and described
The corresponding relationship of the linear relationship of electric current and the capacity coefficient having determined that and the temperature and the electric current is determined not
It is determined the temperature and the corresponding capacity coefficient of the electric current of the corresponding capacity coefficient, it is described default with determination
Corresponding relationship.
Further, the presetting method is current integration method.
Further, the SOC that the battery is determined based on presetting method and the capacity coefficient is based on following public affairs
Formula determines the SOC of the battery:Wherein, SOC0For the initialization of the battery
Residual capacity, a be the capacity coefficient, m be when the temperature is the second preset temperature, the electric current is predetermined current described in
The total capacity of battery, η are discharging efficiency, and I is the electric current of the battery, t0Indicate electric discharge initial time, t1At the end of indicating electric discharge
Between.
Compared with the existing technology, the method for the SOC of the present invention for calculating battery, which has the advantage that, is calculating battery
SOC when, introduce capacity coefficient and the capacity coefficient and be determined based on electric current, therefore, which, which has embodied, is calculating
The influence of electric current is taken into account in this way, realizing when calculating the SOC of battery, is improved by the influence of electric current when the SOC of battery
Calculate the accuracy of the SOC of battery.
Another aspect of the present invention provides the device of SOC for calculating battery a kind of, described device: temperature determination module is used
In the temperature for determining the battery；Electric current determining module, for determining the electric current of the battery；Capacity coefficient determining module is used
In determining the temperature and the corresponding capacity coefficient of the electric current based on default corresponding relationship；And SOC determining module, it is used for base
The SOC of the battery is determined in presetting method and the capacity coefficient.
Further, the default corresponding relationship is determined based on the following contents: measurement is first default when the temperature
First total capacity of temperature, the electric current battery when being predetermined current；Measurement is the described first default temperature when the temperature
Second total capacity of degree, the electric current battery when being other electric currents different from the predetermined current；It is total by described second
Capacity and first total capacity, which compare, determines first preset temperature and other different from the predetermined current
The corresponding capacity coefficient of electric current；Based on determination first preset temperature and other different from the predetermined current
The content of the corresponding capacity coefficient of electric current determines other temperature for being different from first preset temperature and described is different from
The corresponding capacity coefficient of other electric currents of the predetermined current；And based on the capacity coefficient and the temperature and described
The corresponding relationship of the linear relationship of electric current and the capacity coefficient having determined that and the temperature and the electric current is determined not
It is determined the temperature and the corresponding capacity coefficient of the electric current of the corresponding capacity coefficient, it is described default with determination
Corresponding relationship.
Further, the presetting method is current integration method.
Further, the SOC determining module determines that the SOC of the battery is based on presetting method and the capacity coefficient
The SOC of the battery is determined based on following formula: Wherein, SOC0For the electricity
The initialization residual capacity in pond, m are the capacity coefficient, and C is when the temperature is the second preset temperature, the electric current is default
The total capacity of battery when electric current, η are discharging efficiency, and I is the electric current of the battery, t0Indicate electric discharge initial time, t1It indicates
It discharges the end time.
The method of the device and the SOC of above-mentioned calculating battery of the SOC of the calculating battery is had compared with the existing technology
Some advantages are identical, and details are not described herein.
In addition, another aspect of the present invention also provides a kind of machine readable storage medium, on the machine readable storage medium
It is stored with instruction, which is used for so that machine executes above-mentioned method.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies mode and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the method flow diagram of the SOC for the calculating battery that one embodiment of the invention provides；
Fig. 2 is cathode particle LI concentration distribution at the end of different electric discharges under 25 degree；
Fig. 3 is discharge capacity when being discharged at 25 degrees c with different multiplying；And
Fig. 4 be another embodiment of the present invention provides calculating battery SOC device structural block diagram.
Description of symbols:
1 temperature determination module, 2 capacity coefficient determining module
3 SOC determining module, 4 electric current determining module
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can
To be combined with each other.
The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiment.
The one aspect of the embodiment of the present invention provides the method for SOC for calculating battery a kind of.Fig. 1 is one embodiment of the invention
The flow chart of the method for the SOC of the calculating battery of offer.As shown in Figure 1, this method includes the following contents.
In step slo, the temperature and electric current of battery are determined.For example, detecting battery by the equipment that can detecte temperature
Temperature, so that it is determined that the temperature of battery；The electric current of battery is detected by the equipment that can detecte electric current, so that it is determined that battery
Electric current.
In step s 11, temperature and the corresponding capacity coefficient of electric current based on determined by the determination of default corresponding relationship.Its
In, which shows when the temperature of battery is a certain temperature and electric current is a certain electric current, and battery is in the temperature and electricity
The order of accuarcy of total capacity of the total capacity flowed down relative to battery at the temperature and reference current, that is, capacity coefficient table
Battery total capacity is illustrated with the variation of electric current.
Optionally, default corresponding relationship can be determined based on the following contents.
Measurement when the temperature of battery be the first preset temperature, battery electric current be predetermined current when battery total capacity, note
For the first total capacity.Wherein, predetermined current is benchmark electric current.Measurement is when the electricity that the temperature of battery is the first preset temperature, battery
The total capacity of battery, is denoted as the second total capacity when stream is different from other electric current of predetermined current, wherein should be different from default electricity
Other electric currents of stream can be any electric current for the actual conditions for meeting battery.
The second total capacity among the above is compared with the first total capacity, that is, with the second total capacity divided by first total appearance
Amount, determines the first preset temperature and the above-mentioned corresponding capacity coefficient of other electric currents different from predetermined current of battery.
According to determining first preset temperature and the above-mentioned corresponding capacity coefficient side of other electric currents different from predetermined current
Method determines other temperature capacity coefficient corresponding with other electric currents different from predetermined current for being different from the first preset temperature.
Wherein, it should be noted that determination described herein is different from other temperature of the first preset temperature and is different from predetermined current
The corresponding capacity coefficient of other electric currents in other electric currents different from predetermined current and the first above-mentioned preset temperature and not
Other electric currents being same as in the corresponding capacity coefficient of other electric currents of predetermined current can be identical electric current and be also possible to difference
Electric current.In addition, identified other temperature for being different from the first preset temperature and other electric currents pair different from predetermined current
The number for the capacity coefficient answered is at least one, and the number of the capacity coefficient can carry out according to the actual situation, described herein
The number of capacity coefficient is more, and identified default corresponding relationship is more accurate.
Pair of linear relationship and fixed capacity coefficient and temperature and electric current based on capacity coefficient and temperature and electric current
It should be related to and determine not to be determined the temperature of corresponding capacity coefficient and the corresponding capacity coefficient of electric current, to determine default correspond to
Relationship.
It how is exemplified below according to linear relationship and the fixed capacity coefficient of capacity coefficient and temperature and electric current
The temperature for not being determined corresponding capacity coefficient and the corresponding capacity coefficient of electric current are determined with the corresponding relationship of temperature and electric current.
For example, the corresponding relationship of the capacity coefficient having determined that and temperature and electric current may include the first preset temperature and the first default electricity
Flow corresponding first capacity coefficient and third preset temperature and corresponding second capacity coefficient of the second predetermined current, it is thus necessary to determine that the
Four preset temperatures and the corresponding third capacity coefficient of third predetermined current.Firstly, linear relationship is based on, according to the first preset temperature
The first capacity coefficient corresponding with the first predetermined current determines the first preset temperature and the corresponding capacity system of third predetermined current
Number.Then, then it is based on linear relationship, determines the 4th according to the first preset temperature and the corresponding capacity coefficient of third predetermined current
Preset temperature and the corresponding third capacity coefficient of third predetermined current.It is similar, determine arbitrary temp and any electric current pair
The capacity coefficient answered, so that it is determined that going out the default corresponding relationship about temperature and electric current and capacity coefficient.In addition, according to linear
Relationship and the temperature having determined that and electric current determine the temperature for not being determined corresponding capacity coefficient with the corresponding relationship of capacity coefficient
When spending capacity coefficient corresponding with electric current, can be determined with this corresponding capacity coefficient temperature and electric current similar in really
The temperature and electric current for making corresponding capacity coefficient determine capacity coefficient.For example, the capacity coefficient having determined that and temperature and electricity
The corresponding relationship of stream includes the first preset temperature and corresponding first capacity coefficient of the first predetermined current, third preset temperature and the
Corresponding second capacity coefficient of three predetermined currents, the 4th preset temperature and the corresponding third capacity coefficient of the 4th predetermined current need
Determine the 5th preset temperature and the corresponding capacity coefficient of the 5th predetermined current, the 5th preset temperature is compared with third preset temperature
Close, the 5th predetermined current and third predetermined current relatively, then can be according to third preset temperatures and third predetermined current
Corresponding second capacity coefficient determines the 5th preset temperature and the corresponding capacity coefficient of the 5th predetermined current.
In step s 12, the SOC of battery is determined based on presetting method and the capacity coefficient determined.Wherein, side is preset
Method can be current integration method.
It is provided in an embodiment of the present invention calculate battery SOC method calculate battery SOC when, introduce capacity coefficient and
The capacity coefficient is determined based on electric current, and therefore, which has embodied the influence of the electric current when calculating the SOC of battery,
The influence of electric current is taken into account when calculating the SOC of battery in this way, realizing, improves the accuracy for calculating the SOC of battery.
Optionally, determine that the SOC of battery is to determine battery based on following formula based on presetting method and capacity coefficient
SOC:Wherein, SOC0For the initialization residual capacity of battery, a is capacity coefficient,
M is the total capacity of the battery when temperature is the second preset temperature, electric current is predetermined current, and η is discharging efficiency, and I is the electricity of battery
Stream, t0Indicate electric discharge initial time, t1Indicate the electric discharge end time.Predetermined current is a reference current, and the second preset temperature is only
Indicate that the temperature of battery is not limited to the size of temperature, the second preset temperature can be arbitrary temp.
In the ampere-hour integral formula of the existing SOC for calculating battery at a certain temperature the total capacity of battery be it is fixed, no
Whether change by electric current.But the total capacity under actually distinct electric current is different.Calculating electricity provided in an embodiment of the present invention
The method of the SOC in pond introduces capacity coefficient on the basis of based on the SOC of ampere-hour integral calculation battery.Capacity coefficient embodies
Accurate journey of the total capacity under current flow relative to the total capacity of the battery under reference current at this temperature at a certain temperature
Degree, capacity coefficient change with the variation of electric current, to embody total capacity under different electric currents by introducing capacity coefficient
It is different, the influence of electric current is considered when calculating the SOC of battery, improve the accuracy for calculating the SOC of battery, improve and calculate
The precision of the SOC of battery out.
The SOC that battery how is calculated in the embodiment is discussed in detail in the form of an embodiment below.
In the prior art, the SOC algorithm for calculating battery has ignored current vs voltage platform and inside battery physicochemical property
It influences, the embodiment of the present invention does not take into account that the influence of current versus cell total capacity for the estimation strategy of SOC in the prior art, it is intended that
It designs one kind and SOC method is accurately estimated by electric current-capacity relationship, improve the precision of SOC estimation.Battery discharge SOC is estimated not
Standard may result in battery over-discharge, not only calculates the continuation of the journey of vehicle and is not allowed, and has a great impact to the battery core service life.In the reality
It applies in example, the SOC of battery is calculated in conjunction with current integration method.
(1) current integration method brief introduction
At a certain temperature, electric current is accumulative within discharge time in a period of time, initial SOC value SOC0 and integral variation
The difference of △ SOC, as residual capacity SOC percentage.SOC state computation formula are as follows:
In formula, SOC is current remaining capacity, SOC0To initialize residual capacity, n is total appearance of battery under Current Temperatures
Amount, η is discharging efficiency, and I is battery current.
(2) influence of the total capacity of the method combination current versus cell of the SOC provided in an embodiment of the present invention for calculating battery,
Spy introduces a coefficient progress capacity and calculates in real time, on the basis of the total capacity by battery current under temperature t for the battery measured when 1C,
The SOC of battery is calculated based on following formula:
SOC is the calculated SOC of method according to the SOC provided in an embodiment of the present invention for calculating battery in formula；A value model
It encloses for (0.5-1.5)；SOC0It is the initialization residual capacity of battery, m is the total capacity of battery when electric current is 1C under temperature t, should
Total capacity is benchmark capacity.Am is the total capacity of battery when electric current is I under temperature t.The mathematical meaning of a is exactly the electricity at temperature t
The order of accuarcy of reference capacity when the practical total capacity of stream battery when being I relative to battery is 1C.It should be noted that of the invention
In embodiment, when calculating the SOC of battery, temperature can be arbitrary temperature, and electric current can be arbitrary electric current.
(3) the main calculating a of the estimation strategy of the SOC of the calculating battery provided in the embodiment of the present invention, is described below a's
The research of calculation method.
(3.1) introduce how electric current influences battery capacity
According to lithium battery chemical characteristic: the discharge capacity and voltage platform of lithium battery with the increase of discharge current and
Reduce；In lithium battery discharge process, electric current influences the diffusion admittance of electrode surface particle LI, but the speed of particle LI migration is one
Determine in range, and then change active particle LI concentration gradient, concentration polarization phenomenon occurs.The curve of experiment simulation such as Fig. 2 and Fig. 3
It is shown.
Conclusion: at identical temperature, in discharge current (I < 4C), the capacity of battery reduces with the increase of electric current.
(3.2) calculation of a value
Volume test is carried out in different temperatures gradient and different current gradients according to ternary lithium battery, is obtained under same temperature
Electric current-capacity one-to-one relationship.It is the capacity that is discharged of 1C for m with electric current for example, at a certain temperature0；So
Discharge resulting capacity with electric current I at such a temperature afterwards as m1, the corresponding a value of electric current I is m1With m0Ratio.By big
Amount experimental data, the corresponding relationship of available temperature and electric current and a value, as shown in the table.Further, it is also possible to obtain not equality of temperature
Spend reference capacity when lower electric current is 1C, that is, the corresponding relationship of temperature and reference capacity.Based on linear relationship, according to known
Temperature and electric current and the corresponding relationship of a value obtain other temperature and the corresponding a value of electric current, to obtain arbitrary temp and any
The corresponding a value of electric current all covers entire discharge current and temperature.Based on linear relationship, according to known temperature and benchmark
The corresponding relationship of capacity obtains the corresponding reference capacity of other temperature, to obtain the corresponding reference capacity of arbitrary temp.It calculates
When the SOC of battery, a value can be found according to the corresponding relationship of temperature and electric current and a value, according to pair of temperature and reference capacity
Should be related to can find reference capacity.
| Temperature (DEG C) | 0.2C | 0.33C | 0.5C | 0.75C | 1C | 1.5C | 2C |
| -20 | 1 | ||||||
| -10 | 1 | ||||||
| 0 | 1 | ||||||
| 15 | 1 | ||||||
| 25 | 1 | ||||||
| 35 | 1 |
Influence relationship of the method combination electric current to capacity of the SOC provided in an embodiment of the present invention for calculating battery, according to putting
Electric current, temperature are in real-time change in electric process, while influencing the variation of the total capacity of battery.Corresponding electric current-appearance is had at this time
Magnitude relation passes through this 3 variable real-time estimation SOC of electric current, temperature and total capacity.Specifically, it moves and charges by driving
Electric current is looked into the process and temperature obtains coefficient a value, lookup temperature obtains reference capacity, and then is introduced in SOC estimation.In addition, a
The selection of value needs a large amount of data to be determined, and data volume is bigger, and the size determination of a value is more accurate.Multiple groups can be taken
Battery core measures one group of data, can make up the otherness of battery core in this way.In embodiments of the present invention, test data amount it is big and
Accurately, the property of battery core can be represented.
The method of the SOC provided in an embodiment of the present invention for calculating battery has the function of real-time estimation, vehicle discharge process
Middle electric current, temperature are in real-time change, so real-time update a is more reasonable.Difference operation is carried out between each temperature and electric current, it can
All to cover entire discharge current and temperature, the amendment of larger temperature range and electric current section is realized, consider electric current to appearance
The influence of amount.
Correspondingly, the another aspect of the embodiment of the present invention provides the device of SOC for calculating battery a kind of.Fig. 4 is the present invention
The structural block diagram of the device of the SOC for the calculating battery that another embodiment provides.As shown in figure 4, the device includes that temperature determines mould
Block 1, electric current determining module 4, capacity coefficient determining module 2 and SOC determining module 3.Wherein, temperature determination module 1 is for determining
The temperature of battery；Electric current determining module 4 is used to determine the electric current of battery；Capacity coefficient determining module 2 is used to correspond to based on default
Relationship temperature and the corresponding capacity coefficient of electric current；SOC determining module 3 is used to determine electricity based on presetting method and capacity coefficient
The SOC in pond.
Optionally, in embodiments of the present invention, preset corresponding relationship to be determined based on the following contents: measurement is the when temperature
First total capacity of battery when one preset temperature, electric current are predetermined current；Measurement is when temperature is the first preset temperature, electric current is not
It is same as the second total capacity of battery when other electric currents of predetermined current；Second total capacity and the first total capacity are compared and determine the
One preset temperature capacity coefficient corresponding with other electric currents different from predetermined current；Based on determining first preset temperature and difference
In determining other temperature for being different from the first preset temperature of the content of the corresponding capacity coefficient of other electric currents of predetermined current and not
It is same as the corresponding capacity coefficient of other electric currents of predetermined current；And linear relationship based on capacity coefficient and temperature and electric current and
The capacity coefficient having determined that and the corresponding relationship of temperature and electric current determine the temperature for not being determined corresponding capacity coefficient and
The corresponding capacity coefficient of electric current, to determine default corresponding relationship.
Optionally, in embodiments of the present invention, presetting method is current integration method.
Optionally, in embodiments of the present invention, SOC determining module determines battery based on presetting method and capacity coefficient
SOC is the SOC that battery is determined based on following formula: Wherein, SOC0 is battery
Initialization residual capacity, a is capacity coefficient, and m is the total of the battery when temperature is the second preset temperature, electric current is predetermined current
Capacity, η are discharging efficiency, and I is the electric current of battery, t0Indicate electric discharge initial time, t1Indicate the electric discharge end time.
The concrete operating principle and benefit and the present invention of the device of the SOC provided in an embodiment of the present invention for calculating battery are implemented
The concrete operating principle and benefit of the method for the calculating battery that example provides are similar, will not be described in great detail here.
In addition, the another aspect of the embodiment of the present invention also provides a kind of machine readable storage medium, the machine readable storage
Instruction is stored on medium, which is used for so that machine executes method described in above-described embodiment.
The foregoing is merely better embodiments of the invention, are not intended to limit the invention, all of the invention
Within spirit and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of method for the SOC for calculating battery, which is characterized in that the method:
Determine the temperature and electric current of the battery；
The temperature and the corresponding capacity coefficient of the electric current are determined based on default corresponding relationship；And
The SOC of the battery is determined based on presetting method and the capacity coefficient.
2. the method according to claim 1, wherein the default corresponding relationship is determined based on the following contents:
Measure the first total capacity of the battery when the temperature is the first preset temperature, the electric current is predetermined current；
Measurement is when the temperature is first preset temperature, the electric current is other electric currents different from the predetermined current
Second total capacity of the battery；
Second total capacity and first total capacity are compared and determines first preset temperature and described is different from institute
State the corresponding capacity coefficient of other electric currents of predetermined current；
Based on determination first preset temperature and the corresponding capacity of described other electric currents different from the predetermined current
The content of coefficient determines other temperature for being different from first preset temperature and other different from the predetermined current
The corresponding capacity coefficient of electric current；And
Linear relationship based on the capacity coefficient and the temperature and the electric current and the capacity coefficient having determined that with
The corresponding relationship of the temperature and the electric current determines the temperature for not being determined the corresponding capacity coefficient and described
The corresponding capacity coefficient of electric current, with the determination default corresponding relationship.
3. method according to claim 1 or 2, which is characterized in that the presetting method is current integration method.
4. according to the method described in claim 3, it is characterized in that, described determine institute based on presetting method and the capacity coefficient
The SOC for stating battery is the SOC that the battery is determined based on following formula:
Wherein, SOC0For the initialization residual capacity of the battery, a is the capacity coefficient, and m is when the temperature is second pre-
If the total capacity of temperature, the electric current battery when being predetermined current, η is discharging efficiency, and I is the electric current of the battery, t0
Indicate electric discharge initial time, t1Indicate the electric discharge end time.
5. a kind of device for the SOC for calculating battery, which is characterized in that described device:
Temperature determination module, for determining the temperature of the battery；
Electric current determining module, for determining the electric current of the battery；
Capacity coefficient determining module, for determining the temperature and the corresponding capacity system of the electric current based on default corresponding relationship
Number；And
SOC determining module, for determining the SOC of the battery based on presetting method and the capacity coefficient.
6. device according to claim 5, which is characterized in that the default corresponding relationship is determined based on the following contents:
Measure the first total capacity of the battery when the temperature is the first preset temperature, the electric current is predetermined current；
Measurement is when the temperature is first preset temperature, the electric current is other electric currents different from the predetermined current
Second total capacity of the battery；
Second total capacity and first total capacity are compared and determines first preset temperature and described is different from institute
State the corresponding capacity coefficient of other electric currents of predetermined current；
Based on determination first preset temperature and the corresponding capacity of described other electric currents different from the predetermined current
The content of coefficient determines other temperature for being different from first preset temperature and other different from the predetermined current
The corresponding capacity coefficient of electric current；And
Linear relationship based on the capacity coefficient and the temperature and the electric current and the capacity coefficient having determined that with
The corresponding relationship of the temperature and the electric current determines the temperature for not being determined the corresponding capacity coefficient and described
The corresponding capacity coefficient of electric current, with the determination default corresponding relationship.
7. device according to claim 5 or 6, which is characterized in that the presetting method is current integration method.
8. device according to claim 7, which is characterized in that the SOC determining module is based on presetting method and the appearance
Coefficient of discharge determines that the SOC of the battery is the SOC that the battery is determined based on following formula:
Wherein, SOC0For the initialization residual capacity of the battery, a is the capacity coefficient, and m is when the temperature is second pre-
If the total capacity of temperature, the electric current battery when being predetermined current, η is discharging efficiency, and I is the electric current of the battery, t0
Indicate electric discharge initial time, t1Indicate the electric discharge end time.
9. a kind of machine readable storage medium, it is stored with instruction on the machine readable storage medium, which is used for so that machine
Perform claim requires method described in any one of 1-4.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111864282A (en) * | 2020-07-28 | 2020-10-30 | 安徽江淮汽车集团股份有限公司 | Remaining power correction method, power automobile and readable storage medium |
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