CN102707236B - Power battery SOC (State of Charge) estimation method for charging station monitoring system - Google Patents
Power battery SOC (State of Charge) estimation method for charging station monitoring system Download PDFInfo
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- CN102707236B CN102707236B CN201210143777.4A CN201210143777A CN102707236B CN 102707236 B CN102707236 B CN 102707236B CN 201210143777 A CN201210143777 A CN 201210143777A CN 102707236 B CN102707236 B CN 102707236B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000012544 monitoring process Methods 0.000 title abstract 4
- 230000005611 electricity Effects 0.000 claims abstract description 20
- 239000000178 monomer Substances 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The invention relates to a power battery SOC (State of Charge) estimation method for a charging station monitoring system. The estimation method comprises the steps of: obtaining the capacity of a power battery pack according to the characteristic parameters of a power battery practically used by electric bus in a charging station; charging the power battery pack, transmitting charging data in real time, and calculating charging quantity; uploading discharging data of the power battery to the monitoring system in real time through a vehicular intelligent terminal after the power battery pack runs on the electric bus, and calculating the discharging quantity by the monitoring system; and obtaining the influence of temperature and charging frequency on the electricity quantity according to running data, fitting a correction factor, and carrying out online real-time correction on the calculated SOC value. The method can carry out statistics and calculation to obtain the SOC value of the power battery according to the measurement value of the power battery, and fit the correction factor according to the data of temperature and the charging frequency of the power battery, so as to carry out online correction on the SOC value. The method is simple and practical and can perform automatic or manual correction in real time so that the estimation value is more accurate.
Description
Technical field
The invention belongs to automobile power cell technical field, relate to a kind of electrokinetic cell SOC estimation method of filling electrical changing station supervisory system.
Background technology
Along with electric bus intelligence fills the construction of changing and storing integrated power station, electric bus safe and reliable operation, support electric bus run power system---the state of electrokinetic cell is particularly important, and the ruuning situation of electrokinetic cell, particularly SOC value more can react actual conditions intuitively, estimates that the method for SOC value is extremely urgent accurately so a set of.
Summary of the invention
The object of this invention is to provide a kind of electrokinetic cell SOC estimation method of filling electrical changing station supervisory system, to estimate SOC value accurately.
For achieving the above object, step of filling the electrokinetic cell SOC estimation method of electrical changing station supervisory system of the present invention is as follows:
(1) electrokinetic cell pool-size is obtained according to the electrokinetic cell characterisitic parameter filling the actual use of electrical changing station electric motor car;
(2) power battery pack is charged, send charge data in real time, calculate charge capacity according to charging voltage and galvanometer;
(3) power battery pack runs on after in electric motor car, and by vehicle intelligent terminal, upload electrokinetic cell discharge data in supervisory system in real time, this supervisory system calculates discharge electricity amount;
(4) calculate actual electricity according to charge capacity and discharge electricity amount, on the impact of electricity, simulate a modifying factor, according to formula by battery temperature and charging times in driving
Actual electricity/the specified electric quantity of SOC=() * modifying factor
Online correction is in real time carried out to SOC value.
Further, the electrokinetic cell characterisitic parameter in described step (1) comprises the restriction of the battery core of battery, block combiner, battery rated capacity, operating temperature range and discharge and recharge number of times.
Further, voltage stabilizing current-limiting mode is adopted to charge to power battery pack in described step (2).
Further, described step is charged to power battery pack in (2), when system judges that in electrokinetic cell, arbitrary monomer voltage is in setting range, and adjustment charging current and charging voltage.
Further, in charge and discharge process, the arbitrary monomer voltage of electrokinetic cell capacity is greater than threshold voltage, and by these data calculate electrokinetic cell solidify not varying capacity to correct the rated capacity of electrokinetic cell.
Electrokinetic cell SOC estimation method of filling electrical changing station supervisory system of the present invention is passed through filling in electrical changing station supervisory system, current value, magnitude of voltage, temperature, the charging times of real-time measurement electrokinetic cell, and charge capacity and discharge electricity amount, then above measured value is added up, calculated, electrokinetic cell SOC value is calculated according to SOC computing formula, and go out according to the charging times data fitting of temperature and electrokinetic cell the modifying factor that affects SOC precision in this process, on-line amending is carried out to SOC value.The method is simple, practical, and can carry out automatic or manual correction in real time, makes estimated value more accurate.
Accompanying drawing explanation
Fig. 1 is electrokinetic cell influence of characteristic parameter curve map one;
Fig. 2 is electrokinetic cell influence of characteristic parameter curve map two;
Fig. 3 is the method flow diagram of the embodiment of the present invention.
Embodiment
As shown in Figure 3, the step of filling the electrokinetic cell SOC estimation method of electrical changing station supervisory system is as follows:
(1) electrokinetic cell pool-size is obtained according to the electrokinetic cell characterisitic parameter filling the actual use of electrical changing station electric motor car; Electrokinetic cell characterisitic parameter comprises the restriction of the battery core of battery, block combiner, battery rated capacity, operating temperature range and discharge and recharge number of times, as shown in Figure 1, 2;
(2) adopt voltage stabilizing current-limiting mode to charge to power battery pack, send charge data in real time, calculate charge capacity according to charging voltage and galvanometer; When system judges that in electrokinetic cell, arbitrary monomer voltage is in setting range, adjustment charging current and charging voltage;
(3) power battery pack runs on after in electric motor car, and by vehicle intelligent terminal, upload electrokinetic cell discharge data in supervisory system in real time, this supervisory system calculates discharge electricity amount;
(4) actual electricity is calculated according to charge capacity and discharge electricity amount, by battery temperature and charging times in driving on the impact of electricity, simulate a modifying factor, carry out revising in real time online to SOC value according to formula " the actual electricity/specified electric quantity of SOC=() * modifying factor ".
In charge and discharge process, the arbitrary monomer voltage of electrokinetic cell capacity is greater than threshold voltage, and by these data calculate electrokinetic cell solidify not varying capacity to correct the rated capacity of electrokinetic cell.
Modifying factor, does not remove fitted modifying factors by means of only the number of times in charging process, temperature etc. to the impact of electricity, also removes fitted modifying factors by the electricity in the discharge process of vehicle travel process medium power battery.
This method is not only pay close attention to the charging process of electrokinetic cell, also the discharge process of electrokinetic cell is paid close attention in real time, the charge-discharge characteristic of comprehensive dynamic battery goes to realize the estimation to electrokinetic cell SOC, if solve power battery management system when not having, how simply to go in supervisory system side the method estimating electrokinetic cell SOC, so that the operation of the observation electric motor car of safety and reliability.
Claims (4)
1. fill an electrokinetic cell SOC estimation method for electrical changing station supervisory system, it is characterized in that, the step of the method is as follows:
(1) electrokinetic cell pool-size is obtained according to the electrokinetic cell characterisitic parameter filling the actual use of electrical changing station electric motor car;
(2) power battery pack is charged, send charge data in real time, calculate charge capacity according to charging voltage and galvanometer;
(3) power battery pack runs on after in electric motor car, and by vehicle intelligent terminal, upload electrokinetic cell discharge data in supervisory system in real time, this supervisory system calculates discharge electricity amount;
(4) calculate actual electricity according to charge capacity and discharge electricity amount, on the electricity in the impact of electricity and the discharge process of electrokinetic cell, simulate a modifying factor, according to formula by battery temperature and charging times in driving
SOC=(actual electricity/specified electric quantity) * modifying factor
Online correction is in real time carried out to SOC value, automatic or manual correction can be carried out in real time;
In charge and discharge process, the arbitrary monomer voltage of electrokinetic cell capacity is greater than threshold voltage, and by these data calculate electrokinetic cell solidify not varying capacity to correct the rated capacity of electrokinetic cell.
2. method according to claim 1, is characterized in that: the electrokinetic cell characterisitic parameter in described step (1) comprises the restriction of the battery core of battery, block combiner, battery rated capacity, operating temperature range and discharge and recharge number of times.
3. method according to claim 2, is characterized in that: adopt voltage stabilizing current-limiting mode to charge to power battery pack in described step (2).
4. method according to claim 3, is characterized in that: described step is charged to power battery pack in (2), when system judges that in electrokinetic cell, arbitrary monomer voltage is in setting range, and adjustment charging current and charging voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210143777.4A CN102707236B (en) | 2012-05-10 | 2012-05-10 | Power battery SOC (State of Charge) estimation method for charging station monitoring system |
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| CN201210143777.4A CN102707236B (en) | 2012-05-10 | 2012-05-10 | Power battery SOC (State of Charge) estimation method for charging station monitoring system |
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| CN102707236A CN102707236A (en) | 2012-10-03 |
| CN102707236B true CN102707236B (en) | 2015-07-22 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163475A (en) * | 2013-02-04 | 2013-06-19 | 普天新能源有限责任公司 | System on chip (SOC) value measuring method of battery system |
| CN103235266B (en) * | 2013-03-29 | 2017-03-08 | 重庆长安汽车股份有限公司 | The charging state estimation method and a charging state estimation device of electrokinetic cell |
| CN104051810B (en) * | 2014-06-25 | 2016-04-06 | 中国东方电气集团有限公司 | A kind of lithium-ion energy storage battery system SOC estimates rapid correction method |
| CN105807232B (en) * | 2016-03-16 | 2019-01-25 | 青岛理工大学 | A kind of lead-acid accumulator remaining capacity and battery health estimation method |
| CN106772063B (en) * | 2016-11-21 | 2018-03-20 | 华中科技大学 | A kind of method and its device for monitoring charge states of lithium ion battery and health status |
| CN107015162A (en) * | 2017-06-06 | 2017-08-04 | 安徽美能储能系统有限公司 | A kind of SOC on-line calibration methods for zinc-bromine flow battery |
| CN108196199B (en) * | 2018-01-23 | 2020-08-07 | 广州小鹏车联网科技有限公司 | Lithium battery capacity estimation method, system and device in vehicle state |
| CN110422078B (en) * | 2018-04-26 | 2022-04-08 | 宁德时代新能源科技股份有限公司 | Electric box and electric quantity acquisition method thereof |
| CN109521366A (en) * | 2018-11-21 | 2019-03-26 | 爱驰汽车（上海）有限公司 | Electric car changes the performance estimating method and device of power battery in power mode |
| CN109557474B (en) * | 2018-11-22 | 2021-04-23 | 北京新能源汽车股份有限公司 | Method, device and equipment for correcting state of charge of power battery |
| CN111257761A (en) * | 2020-03-01 | 2020-06-09 | 盐城工学院 | Lithium battery SOC estimation method and system based on thermodynamic model |
| CN111969263B (en) * | 2020-07-20 | 2021-10-26 | 浙江吉智新能源汽车科技有限公司 | Method and device for updating SOH of battery pack in charging and replacing power station |
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