CN107024665A - The residual capacity calibration method of battery - Google Patents

The residual capacity calibration method of battery Download PDF

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Publication number
CN107024665A
CN107024665A CN201710349787.6A CN201710349787A CN107024665A CN 107024665 A CN107024665 A CN 107024665A CN 201710349787 A CN201710349787 A CN 201710349787A CN 107024665 A CN107024665 A CN 107024665A
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China
Prior art keywords
battery
residual capacity
voltage
calibration
open
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CN201710349787.6A
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CN107024665B (en
Inventor
孙鑫
郝三存
樊仁义
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Gcl Technology (suzhou) Co Ltd Integrated
Suzhou Xiexin Integrated Energy Storage Technology Co Ltd
GCL System Integration Technology Co Ltd
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Gcl Technology (suzhou) Co Ltd Integrated
Suzhou Xiexin Integrated Energy Storage Technology Co Ltd
GCL System Integration Technology Co Ltd
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Priority to CN201710349787.6A priority Critical patent/CN107024665B/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/374Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/367Software therefor, e.g. for battery testing using modelling or look-up tables
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385Arrangements for measuring battery or accumulator variables
    • G01R31/387Determining ampere-hour charge capacity or SoC
    • G01R31/388Determining ampere-hour charge capacity or SoC involving voltage measurements

Abstract

The present invention relates to a kind of residual capacity calibration method of battery, including:Determine the operating voltage range that the load of battery needs;In the operating voltage range, discharge test is carried out to battery, the corresponding relation curve of the residual capacity of battery and the open-circuit voltage of battery is tested out with open circuit voltage method;The corresponding relation curve of the residual capacity of storage battery and the open-circuit voltage of battery;Judge whether battery is in holding state;If so, detection battery works as front voltage, according to the residual capacity of the relation curve calibration battery.By battery in use in the case of, judge whether battery is in holding state, detection battery when front voltage and residual capacity and the corresponding relation curve of the open-circuit voltage of battery using battery are come the residual capacity of calibration battery, effectively reduce error.

Description

The residual capacity calibration method of battery
Technical field
The present invention relates to the residual capacity calibration method of cell art, more particularly to battery.
Background technology
As new energy is in high speed development in recent years, energy storage field has obtained the attention of countries in the world, either new energy Source automobile or van container energy-storage system or household small-size energy-storage system are obtained for significant progress.Battery energy storage system System can not only provide the power output of automobile, and electric energy configuration can be optimized in power network configuration, can be by light Volt system sends out cleaning electrical power storage, is released in time when needed.But energy-storage system needs in use Collocation inverter is used, and the general SOC (residual capacity of battery) according to battery of inverter carries out the logic control of discharge and recharge, So, SOC accuracy is most important to the stability of energy-storage system.SOC is not only relevant with cell voltage, also and temperature, wet Degree, SOH (health status of battery), electric current etc. are relevant.At present in the world, SOC is an arduous problem, and many countries are It is studied, wherein be no lack of neural network, Kalman filtering method scheduling algorithm, but these algorithms implement it is more multiple It is miscellaneous, and need substantial amounts of data and stronger data-handling capacity hardware supported.More the SOC algorithms of prevalence are open circuit at present The mode that voltage method and current integration method are combined is calculated SOC, SOC value when open circuit voltage method is used to calibrate electric, The SOC changes that current integration method is used to calculate in actual charge and discharge process, if but system is constantly in the state of start, with The propulsion of time, SOC error will be integrated with ampere-hour with highlighting, be so possible to the shape in also not full electricity State, SOC, which is shown, to be filled with, or the state not discharged also, and SOC, which is shown, have been discharged, in order in actual moving process Equally SOC is calibrated, the present invention is studied based on this, find a kind of algorithm for design that can be intelligently calibrated to SOC.
The content of the invention
Based on this, it is necessary to there is asking for error when normally using for the residual capacity calibration method of existing battery There is provided a kind of residual capacity calibration method for the battery that can effectively reduce error in use for topic.
A kind of residual capacity calibration method of battery, including:Determine the operating voltage range that the load of battery needs;Institute State in operating voltage range, discharge test is carried out to battery, test out with open circuit voltage method the residual capacity and battery of battery The corresponding relation curve of open-circuit voltage;The corresponding relation curve of the residual capacity of storage battery and the open-circuit voltage of battery;Judge Whether battery is in holding state;If so, detection battery works as front voltage, according to the residue of the relation curve calibration battery Capacity.
The residual capacity calibration method of above-mentioned battery, by battery in use in the case of, judge whether battery is located In holding state, that detects battery works as front voltage and residual capacity and the corresponding relation of the open-circuit voltage of battery using battery Curve carrys out the residual capacity of calibration battery, effectively reduces error.
In one of the embodiments, it is described to judge whether battery includes in holding state:Judge the discharge and recharge of battery Whether electric current is less than setting electric current value;If so, the charging and discharging currents of record battery are less than the duration of setting electric current value;When filling When the duration that discharge current is less than setting electric current value is more than setting time, judge that battery is in holding state.
In one of the embodiments, the setting electric current value is 0.02C, and wherein C is the charge-discharge magnification of battery.
In one of the embodiments, the setting time is obtained by following methods:Battery full of in the case of Discharged with maximum operating currenbt;During electric discharge, judge battery sets magnitude of voltage when whether front voltage is less than; If so, the output circuit of battery is disconnected and judges whether the open-circuit voltage of battery is stablized;If the open-circuit voltage of battery is stable, The open-circuit voltage stable elapsed time of battery is arrived after the output circuit disconnection for recording battery;The elapsed time conduct Setting time.
In one of the embodiments, the setting magnitude of voltage is the final discharging voltage of battery.
In one of the embodiments, the setting magnitude of voltage is the minimum of cell load.
In one of the embodiments, the maximum operating currenbt is the maximum operating currenbt of cell load.
In one of the embodiments, if battery is not in holding state, with the residue of current integration method calibration battery Capacity.
In one of the embodiments, the relation curve is equably drawn with the coordinate of axle where the residual capacity of battery It is divided into 30 to 40 sections, beginning and end of the relation curve in this section is connected with straightway in each section.
In one of the embodiments, the relation curve is equably drawn with the coordinate of axle where the residual capacity of battery It is divided into 34 sections, beginning and end of the relation curve in this section is connected with straightway in each section.
Brief description of the drawings
Fig. 1 is the flow chart of the residual capacity calibration method of the battery of an embodiment;
Fig. 2 judges whether battery is in the flow of holding state in the residual capacity calibration method for the battery of an embodiment Figure;
Fig. 3 judges to set when whether battery is in holding state in the residual capacity calibration method for the battery of an embodiment The flow chart of the preparation method of time.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.
As shown in figure 1, being a kind of flow chart of the residual capacity calibration method of battery, this method comprises the following steps S1100~step S1600.
Step S1100, the operating voltage range for loading needs for determining battery.
That is, according to the load normal work of battery it needs to be determined that the minimum and the maximum of load of load Operating voltage, so that it is determined that the working range voltage that the load of battery needs.
Step S1200, in the operating voltage range, to battery carry out discharge test, tested out with open circuit voltage method The corresponding relation curve of the residual capacity of battery and the open-circuit voltage of battery.
The general principle of open circuit voltage method is, by battery sufficient standing, battery terminal voltage is recovered to open-circuit voltage, stand Time is general more than 1 hour.It is appreciated that the residual capacity of the minimum correspondence battery of load is minimum value, i.e., It is zero, the residual capacity of the maximum working voltage correspondence battery of load is maximum.
That is, during open circuit voltage method test, maximum work of the test to load since the minimum of load Terminate as voltage tester, so as to obtain the one-to-one battery of open-circuit voltage in the operating voltage range that load needs with battery Residual capacity.In the present embodiment, using the open-circuit voltage of battery as abscissa, the residual capacity of battery is ordinate, is obtained The corresponding relation curve of the residual capacity of battery and the open-circuit voltage of battery.
It is appreciated that in another embodiment, using the open-circuit voltage of battery as ordinate, the residual capacity of battery is sat to be horizontal Mark, obtains the corresponding relation curve of the residual capacity of battery and the open-circuit voltage of battery.
The corresponding relation curve of step S1300, the residual capacity of storage battery and battery open-circuit voltage.
Specifically, the residual capacity of the storage battery obtained in battery management system storing step S1200 and battery The corresponding relation curve of open-circuit voltage.
Certainly, in order to battery management system is to the relation curve convenient storage, follow-up convenience of calculation and ensures certain Computational accuracy, the relation curve can be handled using sectionalized linearization method.
Specifically, the relation curve is evenly divided into 30 to 40 with the coordinate of axle where the residual capacity of battery Section, beginning and end of the relation curve in this section is connected in each section with straightway.
More specifically, the relation curve is evenly divided into 34 areas with the coordinate of axle where the residual capacity of battery Section, beginning and end of the relation curve in this section is connected in each section with straightway.
Step S1400, judge battery whether be in holding state, if so, then perform step S1500, otherwise perform step S1600。
Specifically, as shown in Fig. 2 being to judge whether battery is in the flow chart of holding state, this method includes following step Rapid S1410~step S1430.
Step S1410, judge battery charging and discharging currents whether be less than setting electric current value, if so, then performing step S1420, otherwise returns and continues to judge.
A setting electric current value can be determined according to the working condition of the situation of battery in itself and cell load, for judging The holding state of battery.
Specifically, the setting electric current value can be 0.02C, and wherein C is the charge-discharge magnification of battery.Wherein, discharge and recharge Multiplying power=charging and discharging currents/rated capacity;For example:When rated capacity is discharged for 100Ah battery with 20A, its discharge-rate is 0.2C.Battery discharge C rates, 1C, 2C, 0.2C is battery discharge rates:Represent that one kind of electric discharge speed is measured.Capacity 1 used Hour discharge off, referred to as 1C electric discharges;5 hours discharge offs, then referred to as 1/5=0.2C electric discharges.For example, coming for 24AH batteries Say, 2C discharge currents are 48A, 0.5C discharge currents are 12A.
It is relevant with the capacity of battery namely to judge the setting electric current value used in the holding state of battery, for difference The battery of capacity uses different setting electric current values.
Step S1420, duration of the charging and discharging currents less than setting electric current value for recording battery.
That is, when the charging and discharging currents of battery are less than setting electric current value, beginning to record the discharge and recharge electricity of battery Duration of the stream less than setting electric current value.
Step S1430, when charging and discharging currents be less than setting electric current value duration be more than setting time when, judge battery In holding state.
A setting time can be determined according to the working condition of the situation of battery in itself and cell load, for judging electricity The holding state in pond.
In order that setting time setting is more accurate, the setting time can be obtained by following methods.
Fig. 3 is the flow chart of the preparation method of the setting time, and this method comprises the following steps S1431~step S1435。
Step S1431, battery discharged full of in the case of with maximum operating currenbt.
Specifically, the maximum operating currenbt can be the maximum operating currenbt of cell load.
Step S1432, during electric discharge, judge battery when front voltage whether be less than setting magnitude of voltage, if so, Step S1433 is then performed, otherwise returns and continues to judge.
Specifically, the setting magnitude of voltage can be the final discharging voltage of battery or the minimum work electricity of cell load Pressure.
Step S1433, the output circuit of battery is disconnected and judges whether the open-circuit voltage of battery is stablized, if so, then holding Row step S1434, otherwise returns and continues to judge.
The output circuit of battery, which is disconnected, to be meaned battery open circuit, and judging whether the open-circuit voltage of battery is stable can lead to Whether the voltage pulsation amplitude for crossing the open-circuit voltage of detection battery is less than voltage preset value to judge.Voltage preset value can basis The size for loading the operating voltage range needed carrys out value.It is appreciated that the operating voltage range that load needs is bigger, voltage is pre- If value can be obtained greatly a bit.The operating voltage range for loading needs is smaller, and voltage preset value can obtain a little bit smaller.
Step S1434, the output circuit of record battery arrive the open-circuit voltage stable elapsed time of battery after disconnecting.
That is, the record time is begun to after the output circuit of battery is disconnected, until the open-circuit voltage of battery is steady It is set to only.
Step S1435, the elapsed time are used as setting time.
The preparation method of above-mentioned setting time, is discharged battery with maximum operating currenbt full of in the case of, and one Straight discharge into sets magnitude of voltage when front voltage is less than, after then the output circuit of battery is disconnected, the open-circuit voltage of battery It can rise, after certain time, the open-circuit voltage of battery can recover stable, after the output circuit disconnection by recording battery To the open-circuit voltage stable elapsed time of battery, using the elapsed time as setting time, battery has been obtained in pole Discharged in the case of end, the time that then terminal voltage of battery is returned to required for stabilization.Battery is in normal condition to load After discharge and recharge, the time required for the terminal voltage of battery recovers stabilization is both less than the setting time obtained by this method.
Step S1500, detection battery work as front voltage, according to the residual capacity of the relation curve calibration battery.
That is, detection battery works as front voltage, by the residual capacity of the battery stored in battery management system With the corresponding relation curve of the open-circuit voltage of battery, the residual capacity of battery, the calibration of the residual capacity of complete battery pair are obtained.
Step S1600, the residual capacity with current integration method calibration battery.
Because current integration method is the prior art for calibration battery dump energy, this is not repeated.
The residual capacity calibration method of above-mentioned battery, by battery in use in the case of, judge whether battery is located In holding state, that detects battery works as front voltage and residual capacity and the corresponding relation of the open-circuit voltage of battery using battery Curve carrys out the residual capacity of calibration battery, effectively reduces error.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (10)

1. a kind of residual capacity calibration method of battery, including:
Determine the operating voltage range that the load of battery needs;
In the operating voltage range, discharge test is carried out to battery, the residual capacity of battery is tested out with open circuit voltage method With the corresponding relation curve of the open-circuit voltage of battery;
The corresponding relation curve of the residual capacity of storage battery and the open-circuit voltage of battery;
Judge whether battery is in holding state;
If so, detection battery works as front voltage, according to the residual capacity of the relation curve calibration battery.
2. the residual capacity calibration method of battery according to claim 1, it is characterised in that described to judge whether battery is located Include in holding state:
Judge whether the charging and discharging currents of battery are less than setting electric current value;
If so, the charging and discharging currents of record battery are less than the duration of setting electric current value;
When the duration that charging and discharging currents are less than setting electric current value being more than setting time, judge that battery is in holding state.
3. the residual capacity calibration method of battery according to claim 2, it is characterised in that the setting electric current value is 0.02C, wherein C are the charge-discharge magnification of battery.
4. the residual capacity calibration method of battery according to claim 2, it is characterised in that the setting time is under State method acquisition:
Battery is discharged full of in the case of with maximum operating currenbt;
During electric discharge, judge battery sets magnitude of voltage when whether front voltage is less than;
If so, the output circuit of battery is disconnected and judges whether the open-circuit voltage of battery is stablized;
If the open-circuit voltage of battery is stable, the open-circuit voltage stabilization after the output circuit disconnection of record battery to battery is passed through Time;
The elapsed time is used as setting time.
5. the residual capacity calibration method of battery according to claim 4, it is characterised in that the setting magnitude of voltage is electricity The final discharging voltage in pond.
6. the residual capacity calibration method of battery according to claim 4, it is characterised in that the setting magnitude of voltage is electricity The minimum of pond load.
7. the residual capacity calibration method of battery according to claim 4, it is characterised in that the maximum operating currenbt is The maximum operating currenbt of cell load.
8. the residual capacity calibration method of battery according to claim 1, it is characterised in that if battery is not in standby shape State, then with the residual capacity of current integration method calibration battery.
9. the residual capacity calibration method of battery according to claim 1, it is characterised in that the relation curve with electricity The coordinate of axle is evenly divided into 30 to 40 sections where the residual capacity in pond, connects described with straightway in each section Beginning and end of the relation curve in this section.
10. the residual capacity calibration method of battery according to claim 1, it is characterised in that the relation curve with The coordinate of axle is evenly divided into 34 sections where the residual capacity of battery, is closed in each section with straightway connection is described It is beginning and end of the curve in this section.
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CN110174623A (en) * 2019-06-10 2019-08-27 合肥阳光新能源科技有限公司 A kind of SOC calibration method of energy-accumulating power station battery

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