CN105891730B - A kind of computational methods of automobile power cell capacity - Google Patents
A kind of computational methods of automobile power cell capacity Download PDFInfo
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- CN105891730B CN105891730B CN201610481642.7A CN201610481642A CN105891730B CN 105891730 B CN105891730 B CN 105891730B CN 201610481642 A CN201610481642 A CN 201610481642A CN 105891730 B CN105891730 B CN 105891730B
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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
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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Abstract
The present invention provides a kind of computational methods of automobile power cell actual capacity, including following：According to the relationship of SOC value and voltage in battery charging process, starting voltage V when battery SOC is 0% is determined0, battery SOC be given threshold when stage voltage V1And battery SOC corresponding final voltage V when being 100%100；According to the starting voltage V0With the final voltage V100, calculate the marked capacity C of battery0；Calculate battery capacity C when battery SOC is given threshold1；According to battery health SOH, to battery capacity C1It is modified, and obtains and correct battery capacity CIt repaiies；Battery is calculated from the stage voltage V1To the final voltage V100When accumulative charging ampere-hour amount C2；According to amendment battery capacity CIt repaiiesWith accumulative charging ampere-hour amount C2, calculate the actual capacity C of battery.The present invention can reduce the error of battery capacity calculating and actual capacity caused by cell degradation, improve the real-time and accuracy of battery management system, increase the safety of electric vehicle.
Description
Technical field
The present invention relates to automobile power cell administrative skill field more particularly to a kind of automobile power cell actual capacities
Computational methods.
Background technology
In recent years, the fast development of new-energy automobile, the requirement to automobile power cell are also higher and higher.Automobile power electricity
Kernel component of the pond as electric vehicle has direct shadow to the continual mileage of vehicle, service life, security performance etc.
It rings.The capacity of battery is the important parameter of battery status, is had to the course continuation mileage of electric vehicle, SOC calculating, service life etc.
Great influence, therefore the actual capacity value for obtaining accurate and reliable current power battery is the vital task of battery management system
One of.
In practical applications, with the increase of power battery charge and discharge number, battery gradually fails aging, and battery is practical
Capacity is also gradually reduced, and influences the course continuation mileage of vehicle.At present both at home and abroad in the accurate calculating to battery of electric vehicle rated capacity
A large amount of research has been made in aspect, but common method is still to utilize the new battery pack gamut capacity of Bench calibration and electricity
Pond health status (State of Health, SOH), which is multiplied, obtains the actual capacity of battery.This method, due to battery health shape
State reduces with battery decay aging, and there are large errors with actual battery capacity for the battery capacity being calculated.
Invention content
The present invention provides a kind of computational methods of automobile power cell actual capacity, solves existing automobile power cell and holds
Amount is calculated has large error with actual capacity, improves the real-time and accuracy of battery management system, increases electronic
The safety of automobile.
In order to achieve the above object, the present invention provides following technical scheme：
A kind of computational methods of automobile power cell actual capacity, include the following steps：
According to the relationship of SOC value and voltage in battery charging process, starting voltage V when battery SOC is 0% is determined0、
Stage voltage V when battery SOC is given threshold1And battery SOC corresponding final voltage V when being 100%100；
According to the starting voltage V0With the final voltage V100, calculate the marked capacity C of battery0；
According to the marked capacity C of battery0, calculate battery capacity C when battery SOC is given threshold1；
According to battery health SOH, to battery capacity C1It is modified, and obtains and correct battery capacity CIt repaiies；
Battery is calculated from the stage voltage V1To the final voltage V100When accumulative charging ampere-hour amount C2；
According to amendment battery capacity CIt repaiiesWith accumulative charging ampere-hour amount C2, calculate the actual capacity C of battery.
Preferably, described according to the starting voltage V0With the final voltage V100, calculate the marked capacity C of battery0Packet
Include following steps：
By battery discharge, cell output voltage is made to reach the starting voltage V0；
It charges to the battery, makes cell output voltage from the starting voltage V0It is raised to the final voltage V100, and obtain
Take the accumulative charging ampere-hour amount of battery；
The marked capacity C of the battery0For the accumulative charging ampere-hour amount of the battery.
Preferably, the battery capacity C1Equal to the marked capacity C of the battery0With the product of the first threshold；
Preferably, the amendment battery capacity CIt repaiiesEqual to the battery capacity C1With multiplying for the battery health SOH
Product.
Preferably, the calculating battery is from the stage voltage V1To the final voltage V100When accumulative charging ampere-hour
Measure C2Including：
Cell output voltage is obtained from the starting voltage V1It is raised to the final voltage V100Charging current and when charging
Between；
The charging current and the product in the charging time are the accumulative charging ampere-hour amount C of the battery2。
Preferably, the calculating battery is from the stage voltage V1To the final voltage V100When accumulative charging ampere-hour
Measure C2Including：
It obtains in the stage voltage V1When the accumulative charging ampere-hour amount A of battery1With in the final voltage V100When electricity
The accumulative charging ampere-hour amount A in pond100；
According to formula C2=A100-A1, battery is calculated in the stage voltage V1To the final voltage V100When accumulative fill
Electric ampere-hour amount C2。
Preferably, the actual capacity C of the battery is equal to the amendment battery capacity CIt repaiiesWith the accumulative charging ampere-hour amount
C2Sum.
Preferably, the given threshold is 20%.
Preferably, the battery is the single battery of automobile power cell.
Preferably, the starting voltage V0=2.3V, final voltage V100=3.65V.
The present invention provides a kind of computational methods of automobile power cell actual capacity, by battery in different phase voltage
Accumulative charging ampere-hour amount calculate, reduce the battery capacity caused by cell degradation calculate with the error of actual capacity, improve electricity
Pond manages the real-time and accuracy of system, increases the safety of electric vehicle.
Description of the drawings
In order to illustrate more clearly of specific embodiments of the present invention, attached drawing needed in the embodiment will be made below
Simply introduce.
Fig. 1：It is a kind of computational methods flow chart of automobile power cell actual capacity provided by the invention；
Fig. 2：It is a kind of calculation flow chart of battery marked capacity provided in an embodiment of the present invention；
Fig. 3：It is a kind of accumulative charging ampere-hour amount calculation flow chart of battery provided in an embodiment of the present invention；
Fig. 4：It is the accumulative charging ampere-hour amount calculation flow chart of a kind of battery that another embodiment of the present invention provides.
Specific implementation mode
In order to make those skilled in the art more fully understand the scheme of the embodiment of the present invention, below in conjunction with the accompanying drawings and implement
Mode is described in further detail the embodiment of the present invention.
It is influenced for because of cell degradation, current electric automobile power battery calculation of capacity and actual capacity error are big to ask
Topic, the present invention provides a kind of computational methods of automobile power cell actual capacity, by tiring out in different phase voltage to battery
Meter charging ampere-hour amount calculates, and reduces the error of battery capacity calculating and actual capacity caused by cell degradation, improves cell tube
The real-time and accuracy of reason system, increase the safety of electric vehicle.
As shown in Figure 1, be a kind of computational methods flow chart of automobile power cell actual capacity provided by the invention, including
Following steps：
S1：According to the relationship of SOC value and voltage in battery charging process, starting voltage when battery SOC is 0% is determined
V0, battery SOC be given threshold when stage voltage V1And battery SOC corresponding final voltage V when being 100%100；
S2：According to the starting voltage V0With the final voltage V100, calculate the marked capacity C of battery0；
S3：According to the marked capacity C of battery0, calculate battery capacity C when battery SOC is given threshold1；
S4：According to battery health SOH, to battery capacity C1It is modified, and obtains and correct battery capacity CIt repaiies；
S5：Battery is calculated from the stage voltage V1To the final voltage V100When accumulative charging ampere-hour amount C2；
S6：According to amendment battery capacity CIt repaiiesWith accumulative charging ampere-hour amount C2, calculate the actual capacity C of battery.
In practical applications, since the battery charge state SOC value of power battery is at different sections, battery charging voltage
Curvilinear motion is larger, directly affects the computational accuracy of battery capacity, and battery charging voltage is changed the corresponding SOC value of stage greatly
The battery capacity that section obtains, is modified according to the actual conditions of battery, can more obtain the calculating essence of better battery capacity
Degree.
Specifically, the marked capacity of actual capacity/battery of battery, the battery capacity C are equal to according to SOH1Equal to institute
State the marked capacity C of battery0With the product of the given threshold, the amendment battery capacity CIt repaiiesEqual to the battery capacity C1With
The product of the battery health SOH.
As shown in Fig. 2, being a kind of calculation flow chart of battery marked capacity provided in an embodiment of the present invention.According to described
Beginning voltage V0With the final voltage V100, calculate the marked capacity C of battery0Include the following steps：
S201：By battery discharge, cell voltage is made to reach the starting voltage V0；
S202：It charges to the battery, makes cell voltage from the starting voltage V0It is raised to the final voltage V100, and
Obtain the accumulative charging ampere-hour amount of battery；
S203：The marked capacity C of the battery0For the accumulative charging ampere-hour amount of the battery.
In practical applications, when charging to battery, often segmentation is charged, and uses the half ampere-hour amount pair of rated capacity first
Battery charges, its cell voltage is made to reach 3.45V, then continues to charge the battery with the electric current of 10A, until battery
Voltage, which reaches 3.65V, to be stopped, and the accumulative charging ampere-hour amount of the battery is recorded.
Battery is calculated from the stage voltage V1To the final voltage V100When accumulative charging ampere-hour amount C2There are two types of tools
Mode is calculated, and a kind of mode is as shown in figure 3, for a kind of accumulative charging ampere-hour amount calculating of battery provided in an embodiment of the present invention
Flow chart, including it is following：
S301：Cell voltage is obtained from the starting voltage V1It is raised to the final voltage V100Charging current and charging
Time；
S302：The charging current and the product in the charging time are the accumulative charging ampere-hour amount C of the battery2。
Another way is as shown in figure 4, the accumulative charging ampere-hour gauge of a kind of battery provided for another embodiment of the present invention
Flow chart is calculated, including following：
S401：It obtains in the stage voltage V1When the accumulative charging ampere-hour amount A of battery1With in the final voltage V100When
The accumulative charging ampere-hour amount A of battery100；
S402：According to formula C2=A100-A1, battery is calculated in the stage voltage V1To the final voltage V100When
Accumulative charging ampere-hour amount C2。
Further, the actual capacity C of battery is equal to the amendment battery capacity CIt repaiiesWith the accumulative charging ampere-hour amount C2It
With.
In practical applications, since the battery charge state SOC value of power battery is at 0%~20% section, battery
Charging voltage variation is maximum, and the given threshold can be 20%, the value of the given threshold of the power battery of certain different model
It can be different, be determined by concrete condition.
Further, the battery is the single battery of automobile power cell, the starting voltage V0=2.3V, final voltage
V100=3.65V.
Specifically, it illustrates, includes the following steps by taking the nominal capacity 72AH model ferric phosphate lithium cells that dispatch from the factory as an example：
Step 1：New battery enters factory, is put its voltage to V with 72A electric currents with charge and discharge electric cabinet0=2.3V；
Step 2：Battery is charged to by 3.45V with 36A electric currents using charge and discharge electric cabinet, then 3.65V is charged to 10A electric currents,
This primary cell charging ampere-hour C is obtained by charging cabinet0=73Ah；
Step 3：Take C20=20%*C0=14.6Ah；With cell decay, it is modified to 14.6*SOH；
Step 4：It is 14.6Ah that rack charges to capacity using vehicle charge mode electric current to new battery pack, and record is electric at this time
Wrap minimum monomer voltage V in pond20=3.342V；
Step 5：When vehicle charges, battery is raised to 3.65V from voltage 3.342；
Step 6：Record battery charges to the practical charging capacitys of 3.65V from 3.342V, can obtain C2=59Ah；
Step 7：When vehicle generation is above-mentioned completely fills, then the actual capacity for calculating battery is：
C=14.6*SOH+59, at this time battery SOH=100%, i.e. C=14.6+59=73.6Ah；
As it can be seen that the present invention is carried for a kind of computational methods of automobile power cell actual capacity, by battery in not same order
The accumulative charging ampere-hour amount of section voltage calculates, and obtains battery actual capacity, and the present invention can reduce the battery caused by cell degradation
The error of calculation of capacity and actual capacity improves the real-time and accuracy of battery management system, increases the safety of electric vehicle
Property.
The structure, feature and effect of the present invention, the above institute is described in detail according to diagrammatically shown embodiment above
Only presently preferred embodiments of the present invention is stated, but the present invention is not to limit practical range, every structure according to the present invention shown in drawing
Change made by thinking, or is revised as the equivalent embodiment of equivalent variations, when not going beyond the spirit of the description and the drawings,
It should all be within the scope of the present invention.
Claims (10)
1. a kind of computational methods of automobile power cell actual capacity, which is characterized in that include the following steps：
According to the relationship of SOC value and voltage in battery charging process, starting voltage V when battery SOC is 0% is determined0, battery
Stage voltage V when SOC is given threshold1And battery SOC corresponding final voltage V when being 100%100；
According to the starting voltage V0With the final voltage V100, calculate the marked capacity C of battery0；
According to the marked capacity C of battery0, calculate battery capacity C when battery SOC is given threshold1；
According to battery health SOH, to battery capacity C1It is modified, and obtains and correct battery capacity CIt repaiies；
Battery is calculated from the stage voltage V1To the final voltage V100When accumulative charging ampere-hour amount C2；
According to amendment battery capacity CIt repaiiesWith accumulative charging ampere-hour amount C2, calculate the actual capacity C of battery.
2. the computational methods of automobile power cell actual capacity according to claim 1, which is characterized in that described according to institute
State starting voltage V0With the final voltage V100, calculate the marked capacity C of battery0Include the following steps：
By battery discharge, cell output voltage is made to reach the starting voltage V0；
It charges to the battery, makes cell output voltage from the starting voltage V0It is raised to the final voltage V100, and obtain electricity
The accumulative charging ampere-hour amount in pond；
The marked capacity C of the battery0For the accumulative charging ampere-hour amount of the battery.
3. the computational methods of automobile power cell actual capacity according to claim 1, which is characterized in that the battery holds
Measure C1Equal to the marked capacity C of the battery0With the product of the given threshold.
4. the computational methods of automobile power cell actual capacity according to claim 1, which is characterized in that the amendment electricity
Tankage CIt repaiiesEqual to the battery capacity C1With the product of the battery health SOH.
5. the computational methods of automobile power cell actual capacity according to claim 1, which is characterized in that the calculating electricity
Pond is from the stage voltage V1To the final voltage V100When accumulative charging ampere-hour amount C2Including：
Cell output voltage is obtained from the starting voltage V1It is raised to the final voltage V100Charging current and the charging time；
The charging current and the product in the charging time are the accumulative charging ampere-hour amount C of the battery2。
6. the computational methods of automobile power cell actual capacity according to claim 1, which is characterized in that the calculating electricity
Pond is from the stage voltage V1To the final voltage V100When accumulative charging ampere-hour amount C2Including：
It obtains in the stage voltage V1When the accumulative charging ampere-hour amount A of battery1With in the final voltage V100When battery it is tired
Meter charging ampere-hour amount A100；
According to formula C2=A100-A1, battery is calculated in the stage voltage V1To the final voltage V100When accumulative charging peace
When measure C2。
7. the computational methods of automobile power cell actual capacity according to claim 1, which is characterized in that the battery
Actual capacity C is equal to the amendment battery capacity CIt repaiiesWith the accumulative charging ampere-hour amount C2The sum of.
8. the computational methods of automobile power cell actual capacity according to claim 1, which is characterized in that the setting threshold
Value is 20%.
9. according to the computational methods of claim 1 to 8 any one of them automobile power cell actual capacity, which is characterized in that
The battery is the single battery of automobile power cell.
10. the computational methods of automobile power cell actual capacity according to claim 9, which is characterized in that the starting
Voltage V0=2.3V, final voltage V100=3.65V.
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| CN106443462A (en) * | 2016-09-05 | 2017-02-22 | 深圳市沃特玛电池有限公司 | Method for correcting maximum usable capacity of power battery pack of electric car |
| CN106291386B (en) * | 2016-09-20 | 2019-06-11 | 深圳市鑫彩翼科技有限公司 | A kind of method of quick detection rechargeable battery capacity |
| CN106585422B (en) * | 2017-02-17 | 2020-07-17 | 合肥国轩高科动力能源有限公司 | SOH estimation method for power battery |
| CN107861074B (en) * | 2017-12-21 | 2020-05-26 | 江苏罗思韦尔电气有限公司 | Lithium battery SOC estimation method |
| CN110045291B (en) * | 2019-04-26 | 2020-12-25 | 上海什弋维新能源科技有限公司 | Lithium battery capacity estimation method |
| CN110133535B (en) * | 2019-06-21 | 2022-04-08 | 阳光电源股份有限公司 | SOH value determination method and device of battery system |
| CN111239624B (en) * | 2020-02-21 | 2022-10-11 | 中创新航科技股份有限公司 | Battery capacity calibration method and device, electronic equipment and storage medium |
| CN111490575A (en) * | 2020-05-06 | 2020-08-04 | 上海挚想科技有限公司 | Battery cell capacity calculation method and system, mobile power supply and shared charging equipment |
| CN113733980B (en) * | 2020-05-29 | 2022-12-20 | 蜂巢能源科技股份有限公司 | Method, apparatus, medium, and electronic device for determining capacity of power battery |
| CN111929596B (en) * | 2020-07-31 | 2023-04-25 | 蜂巢能源科技股份有限公司 | Method and device for acquiring battery capacity, storage medium and electronic equipment |
| CN112034367B (en) * | 2020-11-06 | 2021-01-15 | 瑞浦能源有限公司 | Lithium ion battery capacity prediction method and system |
| CN114035061B (en) * | 2021-11-30 | 2023-08-29 | 深蓝汽车科技有限公司 | On-line estimation method and system for battery state of health of battery pack |
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