CN107861074A - A kind of lithium battery SOC estimation method - Google Patents
A kind of lithium battery SOC estimation method Download PDFInfo
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- CN107861074A CN107861074A CN201711397185.4A CN201711397185A CN107861074A CN 107861074 A CN107861074 A CN 107861074A CN 201711397185 A CN201711397185 A CN 201711397185A CN 107861074 A CN107861074 A CN 107861074A
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- battery
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- rated capacity
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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 present invention relates to a kind of lithium battery SOC estimation method, including：Rough estimation SOC value of battery obtains SOC coarse values；In vehicle travel process, BMS calculates the actual discharge capacity of battery in real time；When SOC coarse values are less than the critical value demarcated in advance, battery theory discharge capacity is calculated according to the rated capacity of battery；The actual rated capacity of battery is calculated according to battery rated capacity, actual discharge capacity and theoretical discharge capacity, BMS, and is deposited into EEPROM and is used for calculating the accurate SOC value of battery, and former rated capacity is equal to actual rated capacity；The accurate SOC value of now battery is calculated according to the actual rated capacity actually calculated.The present invention can improve the reliability and stability of battery SOC estimation, battery history rated capacity value can be recorded, can be with the health status of reaction cell, it can efficiently solve due to battery SOC estimation is inaccurate caused by cell degradation or battery core quality are inconsistent the problem of, the needs of practical application can be met well.
Description
Technical field
The present invention relates to a kind of lithium battery SOC estimation method.
Background technology
The accurate estimation of battery charge state (State of Charge, SOC) be batteries of electric automobile charge and discharge control and
The important evidence of Dynamic Optimum management, the service life of battery and the power performance of automobile are directly affected, and electronic vapour can be predicted
The continual mileage of car.It can be seen that the problem of accurate measurement of battery dump energy is very crucial.Battery SOC calculation formula is：
SOC=1-Q/C.The lithium battery SOC estimation method commonly used on present new-energy automobile has current integration method and Kalman filtering method,
Regardless of evaluation method, if battery total capacity C cannot be precisely calculated, accurately estimation battery has been released in any case
Electricity Q, all can not accurately, reliably estimate very much battery SOC.
Because lithium battery is during recycling, the service life of lithium battery can all be gradually shortened, while lithium battery
Rated capacity can also gradually decrease therewith, if so using traditional SOC estimation method, always by the rated capacity of lithium battery
As fixed value when dispatching from the factory, the SOC of lithium battery will certainly be caused to estimate inaccurately.Even if improve constantly battery discharge capacity
Precision, it cannot guarantee that the degree of accuracy of battery SOC estimation.
The electrokinetic cell PACK of new-energy automobile is made up of substantial amounts of single battery core, in assembling it is difficult to ensure that each list
The uniformity of body battery core, it is possible to which some single battery core actual capacities are less than normal.If estimate battery also according to rated capacity
SOC, then last SOC estimations are certainly inaccurate.
Electrokinetic cell PACK is during recycling, and due to the otherness of each single battery core, some single battery cores exist
It can not be completely filled with during charging.There is no fully charged single battery core for those, also according to specified when carrying out battery SOC estimation
Capacity is carried out, so the battery SOC affirmative finally estimated is inaccurate.
The content of the invention
For above-mentioned problems of the prior art, it is an object of the invention to provide one kind can avoid the occurrence of above-mentioned skill
The lithium battery SOC estimation method of art defect.
In order to realize foregoing invention purpose, technical scheme provided by the invention is as follows：
A kind of lithium battery SOC estimation method, including：
Step 1：Rough estimation SOC value of battery obtains SOC coarse values SOCRoughly；
Step 2：To SOCRoughlyIt is modified, obtains SOC exact values SOCAccurately。
Further, step 1 comprises the following steps：
Step 1) is fully charged by battery PACK each single battery core when battery PACK dispatches from the factory, BMS calculate battery PACK this
When capacity and as battery rated capacity CIt is specified, the battery rated capacity C that then will be calculatedIt is specifiedIt is stored in EEPROM,
The rated capacity C to be dispatched from the factory as batteryIt is specified；
Step 2) is according to the rated capacity C of batteryIt is specifiedEstimate rough SOC value of battery SOCRoughly。
Further, step 2) is specially：Using Kalman filtering method or current integration method, according to the rated capacity of battery
CIt is specifiedEstimate rough SOC value of battery SOCRoughly。
Further, step 2 comprises the following steps：
For step (1) in vehicle travel process, BMS calculates the actual discharge capacity Q of battery in real timePut in fact；
Step (2) works as battery SOCRoughlyLess than the critical value SOC demarcated in advanceCritical valueWhen, according to the rated capacity C of batteryIt is specified
Battery theory discharge capacity Q is calculatedIt is theoretical：
QIt is theoretical=CIt is specified·(1-SOCCritical value)；
Step (3) is according to battery rated capacity CIt is specified, actual discharge capacity QPut in factWith theoretical discharge capacity QIt is theoretical, BMS calculates
Go out the actual rated capacity C of batteryIt is actual specified, and it is deposited into accurate SOC value SOCs of the EEPROM for calculating batteryAccuratelyUse, and former volume
Constant volume CIt is specifiedEqual to actual rated capacity CIt is actual specified：
CIt is actual specified=CIt is specified·QPut in fact/QIt is theoretical；
Step (4) is according to the actual rated capacity C actually calculatedIt is actual specifiedTo calculate the accurate SOC value SOC of now batteryAccurately：
SOCAccurately=1-QPut in fact/CIt is actual specified。
Further, in step (1), BMS calculates battery reality in real time using Kalman filtering method or current integration method
Discharge capacity QPut in fact。
Lithium battery SOC estimation method provided by the invention, the reliability and stability of battery SOC estimation can be improved, are obtained
To accurate SOC value, battery history rated capacity value can be recorded, can effectively be solved with the health status of reaction cell
Certainly due to battery SOC estimation is inaccurate caused by cell degradation or battery core quality are inconsistent the problem of, and demarcation can be passed through
Method realize to critical value SOC thereinCritical valueChange, the needs of practical application can be met well.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings and specific implementation
The present invention will be further described for example.It should be appreciated that specific embodiment described herein is only to explain the present invention, and do not have to
It is of the invention in limiting.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of protection of the invention.
A kind of lithium battery SOC estimation method, comprises the following steps：
Step 1：Rough estimation SOC value of battery obtains SOC coarse values SOCRoughly；
Step 2：To SOCRoughlyIt is modified, obtains SOC exact values SOCAccurately。
Specifically, as shown in Figure 1：
Step 1 comprises the following steps：
Step 1) is fully charged by battery PACK each single battery core when battery PACK dispatches from the factory, BMS (battery
Management system, battery management system) calculate battery PACK capacity now and as battery rated capacity
CIt is specified, the battery rated capacity C that then will be calculatedIt is specifiedIt is stored in EEPROM, the rated capacity C to be dispatched from the factory as batteryIt is specified；
Step 2) uses traditional SOC estimation method such as Kalman filtering method or current integration method, according to the volume of battery
Constant volume CIt is specifiedEstimate rough SOC value of battery SOCRoughly。
Step 2 comprises the following steps：
For step (1) in vehicle travel process, BMS calculates battery reality in real time using Kalman filtering method or current integration method
Border discharge capacity QPut in fact；
Step (2) works as battery SOCRoughlyLess than the critical value SOC demarcated in advanceCritical valueWhen, according to the rated capacity C of batteryIt is specified
Battery theory discharge capacity Q is calculatedIt is theoretical：
QIt is theoretical=CIt is specified·(1-SOCCritical value)；
Step (3) is according to battery rated capacity CIt is specified, actual discharge capacity QPut in factWith theoretical discharge capacity QIt is theoretical, BMS calculates
Go out the actual rated capacity C of batteryIt is actual specified, and it is deposited into accurate SOC value SOCs of the EEPROM for calculating batteryAccuratelyUse, and former volume
Constant volume CIt is specifiedEqual to actual rated capacity CIt is actual specified：
CIt is actual specified=CIt is specified·QPut in fact/QIt is theoretical；
CIt is specified=CIt is actual specified；
Step (4) is according to the actual rated capacity C actually calculatedIt is actual specifiedTo calculate the accurate SOC value SOC of now batteryAccurately,
SOCAccurately=1-QPut in fact/CIt is actual specified, SOCAccuratelyThe as accurate SOC value of battery now.
Lithium battery SOC estimation method provided by the invention, the reliability and stability of battery SOC estimation can be improved, are obtained
To accurate SOC value, battery history rated capacity value can be recorded, can effectively be solved with the health status of reaction cell
Certainly due to battery SOC estimation is inaccurate caused by cell degradation or battery core quality are inconsistent the problem of, and demarcation can be passed through
Method realize to critical value SOC thereinCritical valueChange, the needs of practical application can be met well.
Embodiment described above only expresses embodiments of the present invention, and its description is more specific and detailed, but can not
Therefore it is interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art,
Without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection model of the present invention
Enclose.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (5)
- A kind of 1. lithium battery SOC estimation method, it is characterised in that including：Step 1：Rough estimation SOC value of battery obtains SOC coarse values SOCRoughly；Step 2：To SOCRoughlyIt is modified, obtains SOC exact values SOCAccurately。
- 2. lithium battery SOC estimation method according to claim 1, it is characterised in that step 1 comprises the following steps：Step 1) is fully charged by battery PACK each single battery core when battery PACK dispatches from the factory, and BMS calculates battery PACK now Capacity and as battery rated capacity CIt is specified, the battery rated capacity C that then will be calculatedIt is specifiedEEPROM is stored in, as The rated capacity C that battery dispatches from the factoryIt is specified；Step 2) is according to the rated capacity C of batteryIt is specifiedEstimate rough SOC value of battery SOCRoughly。
- 3. the lithium battery SOC estimation method according to claim 1-2, it is characterised in that step 2 is specially：Using karr Graceful filter method or current integration method, according to the rated capacity C of batteryIt is specifiedEstimate rough SOC value of battery SOCRoughly。
- 4. the lithium battery SOC estimation method according to claim 1-3, it is characterised in that step 2 comprises the following steps：For step (1) in vehicle travel process, BMS calculates the actual discharge capacity Q of battery in real timePut in fact；Step (2) works as battery SOCRoughlyLess than the critical value SOC demarcated in advanceCritical valueWhen, according to the rated capacity C of batteryIt is specifiedCalculate Draw battery theory discharge capacity QIt is theoretical：QIt is theoretical=CIt is specified·(1-SOCCritical value)；Step (3) is according to battery rated capacity CIt is specified, actual discharge capacity QPut in factWith theoretical discharge capacity QIt is theoretical, electricity is calculated in BMS The actual rated capacity C in pondIt is actual specified, and it is deposited into accurate SOC value SOCs of the EEPROM for calculating batteryAccuratelyUse, and former specified appearance Measure CIt is specifiedEqual to actual rated capacity CIt is actual specified：CIt is actual specified=CIt is specified·QPut in fact/QIt is theoretical；Step (4) is according to the actual rated capacity C actually calculatedIt is actual specifiedTo calculate the accurate SOC value SOC of now batteryAccurately： SOCAccurately=1-QPut in fact/CIt is actual specified。
- 5. the lithium battery SOC estimation method according to claim 1-4, it is characterised in that in step (1), BMS is using card Kalman Filtering method or current integration method calculate the actual discharge capacity Q of battery in real timePut in fact。
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Cited By (5)
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| CN111007412A (en) * | 2019-12-25 | 2020-04-14 | 宜宾凯翼汽车有限公司 | Method for updating actual available capacity of power battery |
| CN111239624A (en) * | 2020-02-21 | 2020-06-05 | 中航锂电（洛阳）有限公司 | Battery capacity calibration method and device, electronic equipment and storage medium |
| CN112415400A (en) * | 2020-10-21 | 2021-02-26 | 欣旺达电子股份有限公司 | Battery capacity estimation method and system |
| CN113075558A (en) * | 2021-06-08 | 2021-07-06 | 天津市松正电动科技有限公司 | Battery SOC estimation method, device and system |
| CN114114056A (en) * | 2022-01-25 | 2022-03-01 | 深圳康普盾科技股份有限公司 | Battery detection and recovery method and system of power exchange cabinet and storage medium |
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