CN106125008A - The Method for Accurate Calculation of a kind of SOC on-line parameter self-correction and device - Google Patents

Abstract

The invention discloses Method for Accurate Calculation and the device of a kind of SOC on-line parameter self-correction, belong to battery capacity and calculate technical field.Charging SOC calculation procedure: regulation charging current is just, in electric discharge cut-off state, the battery capacity of former two-wheeled charge cycle calculates as the setting parameter of next round charge cycle；Electric discharge SOC calculation procedure: regulation discharge current is negative, and in charge cutoff state, the battery capacity of former two-wheeled discharge cycle calculates as the setting parameter of next round discharge cycle.The scheme eliminates the error that the energy attenuation that long integral error adds up and battery causes because of long-time use brings, improve the computational accuracy of dump energy.

Description

The Method for Accurate Calculation of a kind of SOC on-line parameter self-correction and device

Technical field

The invention belongs to battery capacity and calculate technical field, be specifically related to the accurate meter of a kind of SOC on-line parameter self-correction Calculate method and device.

Background technology

Along with consumption and the development of new energy technology of traditional energy, battery as energy storage device the most increasingly by people Required.And the utilization ratio of battery and use safety are the most increasingly paid close attention to by people.Wherein, the dump energy of battery Estimation is a vital technology in efficiency and safety, obtains accurate SOC value and can be fully understood by each batteries Duty, and then the efficiency of battery can be maximized and ensure the safety and reliability of battery.

The method that there is the online SOC estimation of multiple different battery model in existing technology, the precision reached also each the most not Identical, it is achieved difficulty the most difference.Ampere-hour integration method is the commonplace method of application at present, and this method is simple, Precision is the highest at short notice, but this method is open loop to be estimated, the bad estimation of initial capacity of battery, along with battery Using, battery capacity is also in constantly decay, and under different temperatures, charging capacity and the discharge capacity of battery can be different, different At a temperature of battery total capacity also can be varied from, the most long accumulated error, these are all that common ampere-hour integration method is avoided The drawback do not fallen.Relatively common method also includes extended pattern Kalman filtering algorithm, Weighted Fusion algorithm, neural network Deng.

The patent application document of China's Application No. 201310515760.1, discloses a kind of based on EKF Lithium ion battery SOC On-line Estimation method, it initially sets up the voltage x current of tested lithium ion battery single order RC equivalent circuit The voltage-current relationship formula of relational expression and Order RC equivalent circuit；Again tested lithium ion battery is carried out charge-discharge test, set up The polynomial fit function of the Kalman filtering initial value SOC0 of tested lithium ion battery；Reentry the karr of tested lithium ion battery Graceful filtering initial value SOC0 and initial error covariance P (0) of Kalman filtering；Then electricity based on EKF is carried out Pond SOC estimates, it is achieved the SOC On-line Estimation of lithium ion battery.The difficulty that this algorithm realizes is bigger, calculates complexity, uncomfortable Application universal in engineering.

Summary of the invention

It is an object of the invention to provide Method for Accurate Calculation and the device of a kind of SOC on-line parameter self-correction, in order to solve Long integral error is added up by common ampere-hour integration method and battery electric quantity decays the battery dump energy calculating brought not Problem accurately.

For solving above-mentioned technical problem, the present invention provides the Method for Accurate Calculation of a kind of SOC on-line parameter self-correction, charging SOC calculation procedure: regulation charging current is just；In electric discharge cut-off state, using the battery capacity of last round of charge cycle as under One setting parameter taking turns charge cycle calculates:

${\mathrm{SOC}}_{n+1}^{+}=\frac{{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{+}}$

WhereinRepresent the battery capacity of last round of charge cycle；

Electric discharge SOC calculation procedure: regulation discharge current is negative；In charge cutoff state, with the electricity of last round of discharge cycle Tankage calculates as the setting parameter of next round discharge cycle:

${\mathrm{SOC}}_{n+1}^{-}=\frac{{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{-}}$

WhereinRepresent the battery capacity of last round of discharge cycle.

Further, charging SOC calculation procedure: regulation charging current is just；In electric discharge cut-off state, above two-wheeled charges The battery capacity in cycle calculates as the setting parameter of next round charge cycle:

${\mathrm{SOC}}_{n+1}^{+}=\frac{C_{n-1}^{+}\·{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{+}\·C_n^{+}}$

WhereinRepresent the battery capacity of upper two-wheeled charge cycle respectively；

Electric discharge SOC calculation procedure: regulation discharge current is negative；At charge cutoff state, the electricity of above two-wheeled discharge cycle Tankage calculates as the setting parameter of next round discharge cycle:

${\mathrm{SOC}}_{n+1}^{-}=\frac{C_{n-1}^{-}\·{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{-}\·C_n^{-}}$

WhereinRepresent the battery capacity of upper two-wheeled discharge cycle respectively.

Further, record temperature now in each charge cutoff moment, select at temperature model corresponding to this temperature In enclosing, calculate using the battery capacity of last round of discharge cycle as the setting parameter of next round discharge cycle；Put each Electricity cut-off time all records temperature now, selects in this temperature range, using the battery capacity of last round of charge cycle as The setting parameter of next round charge cycle calculates.

Further, record temperature now in each charge cutoff moment, select at temperature model corresponding to this temperature In enclosing, the battery capacity of above two-wheeled discharge cycle calculates as the setting parameter of next round discharge cycle；Put each Electricity cut-off time all records temperature now, selects in this temperature range, the battery capacity conduct of above two-wheeled charge cycle The setting parameter of next round charge cycle calculates.

Further, described temperature range is divided into six intervals :-10 DEG C～0 DEG C, 0 DEG C～10 DEG C, 10 DEG C～20 DEG C, 20 DEG C～40 DEG C, 40 DEG C～50 DEG C, 50 DEG C～60 DEG C.

What the present invention also provided for a kind of SOC on-line parameter self-correction accurately calculates device, including charging SOC computing module: Regulation charging current is just；In electric discharge cut-off state, using the battery capacity of last round of charge cycle as next round charge cycle Setting parameter calculate:

${\mathrm{SOC}}_{n+1}^{+}=\frac{{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{+}}$

WhereinRepresent the battery capacity of last round of charge cycle；

Electric discharge SOC computing module: regulation discharge current is negative；In charge cutoff state, with the electricity of last round of discharge cycle Tankage calculates as the setting parameter of next round discharge cycle:

${\mathrm{SOC}}_{n+1}^{-}=\frac{{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{-}}$

WhereinRepresent the battery capacity of last round of discharge cycle.

Further, charging SOC computing module: regulation charging current is just；In electric discharge cut-off state, above two-wheeled charges The battery capacity in cycle calculates as the setting parameter of next round charge cycle:

${\mathrm{SOC}}_{n+1}^{+}=\frac{C_{n-1}^{+}\·{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{+}\·C_n^{+}}$

WhereinRepresent the battery capacity of upper two-wheeled charge cycle respectively；

Electric discharge SOC computing module: regulation discharge current is negative；At charge cutoff state, the electricity of above two-wheeled discharge cycle Tankage calculates as the setting parameter of next round discharge cycle:

${\mathrm{SOC}}_{n+1}^{-}=\frac{C_{n-1}^{-}\·{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{-}\·C_n^{-}}$

WhereinRepresent the battery capacity of upper two-wheeled discharge cycle respectively.

Further, being included in each charge cutoff moment records temperature now, selects in temperature corresponding to this temperature In the range of degree, carry out the mould calculated as the setting parameter of next round discharge cycle using the battery capacity of last round of discharge cycle Block；Being additionally included in each electric discharge cut-off time records temperature now, selects in this temperature range, with last round of charging week The battery capacity of phase carries out the module calculated as the setting parameter of next round charge cycle.

Further, being included in each charge cutoff moment records temperature now, selects in temperature corresponding to this temperature In the range of degree, the battery capacity of above two-wheeled discharge cycle carries out the mould calculated as the setting parameter of next round discharge cycle Block；Being additionally included in each electric discharge cut-off time records temperature now, selects in this temperature range, above two-wheeled charging week The battery capacity of phase carries out the module calculated as the setting parameter of next round charge cycle.

Further, described temperature range is divided into six intervals :-10 DEG C～0 DEG C, 0 DEG C～10 DEG C, 10 DEG C～20 DEG C, 20 DEG C～40 DEG C, 40 DEG C～50 DEG C, 50 DEG C～60 DEG C.

The invention has the beneficial effects as follows: in each charge or discharge process finish time, the integration calculating this process obtains To battery capacity carry out the calculating of next round as the correction value of the initial value of next synthermal interval charge or discharge process, Each start time in cycle adaptive setting parameter again, eliminates that long integral error is cumulative and battery is because making for a long time With and the error brought of the energy attenuation that causes；And charging and discharging process separate computations, eliminate battery charging capacity and The error that discharge capacity difference is brought, improves the computational accuracy of dump energy.

Accompanying drawing explanation

Fig. 1 is the Method for Accurate Calculation flow chart of the SOC on-line parameter self-correction of the present invention.

Detailed description of the invention

Illustrate below in conjunction with the accompanying drawings, the present invention is further elaborated.

It is illustrated in figure 1 the Method for Accurate Calculation flow chart of SOC on-line parameter self-correction, particularly as follows:

First controller and battery bag first connection, the special monitoring chip monitoring voltage value using voltage accuracy to be 1mV, SOC initial value is determined according to voltage-temperature-capacity relationship.Because powering on first, system can't detect battery capacity now, therefore root Giving SOC initial value according to voltage-temperature-capacity relationship, this initial value need not accurate, through one to two charging-discharging cycle especially After can self-recision through self study process.Regulation charging current is just, discharge current is negative.

At each charge cutoff moment setting parameter again, it is assumed that n-th reaches charge cutoff or electric discharge cut-off state Record the device electricity value of this charging processOr the device electricity value of discharge processTemperature is divided into six models Enclose interval :-10 DEG C～0 DEG C, 0 DEG C～10 DEG C, 10 DEG C～20 DEG C, 20 DEG C～40 DEG C, 40 DEG C～50 DEG C, 50 DEG C～60 DEG C.

When reaching electric discharge cut-off state, record temperature now, select within the scope of the temperature that this temperature is corresponding, above One takes turns the battery capacity of charge cycle calculates as the setting parameter of next round charge cycle:

${\mathrm{SOC}}_{n+1}^{+}=\frac{{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{+}},C_n^{+}={\∫}_{t_1^{n+}}^{t_2^{n+}}i\left(\mathrm{\τ}\right)d\mathrm{\τ}$

WhereinRepresent the battery capacity of last round of charge cycle,WithRepresent rising of last round of charge cycle respectively Time beginning and deadline；

When reaching charge cutoff state, record temperature now, select within the scope of the temperature that this temperature is corresponding, above One takes turns the battery capacity of discharge cycle calculates as the setting parameter of next round discharge cycle:

${\mathrm{SOC}}_{n+1}^{-}=1+\frac{{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{-}},C_n^{-}={\∫}_{t_1^{n-}}^{t_2^{n-}}i\left(\mathrm{\τ}\right)d\mathrm{\τ}$

WhereinRepresent the battery capacity of last round of discharge cycle,WithRepresent rising of last round of discharge cycle respectively Time beginning and deadline.

In the above-described embodiments, with electric discharge integrated value or a upper identical humidity province in upper cycle of identical temperature range Between the charging integrated value of charge cycle carry out ampere-hour integral and calculating as the initial value of current charge cycle or discharge cycle.Make For another embodiment, the electric discharge integrated value of upper two discharge cycles of identical temperature range or upper two phases can be selected The charging integrated value of the charge cycle in synthermal interval calculates as the initial value of current charge cycle or discharge cycle.

When discharging cut-off state, the battery capacity of above two-wheeled charge cycle is as the ginseng of adjusting of next round charge cycle Number calculates:

${\mathrm{SOC}}_{n+1}^{+}=\frac{C_{n-1}^{+}\·{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{+}\·C_n^{+}},C_n^{+}={\∫}_{t_1^{n+}}^{t_2^{n+}}i\left(\mathrm{\τ}\right)d\mathrm{\τ}$

WhereinRepresent the battery capacity of upper two-wheeled charge cycle respectively,WithRepresent last round of charging respectively The initial time in cycle and deadline；

When charge cutoff state, the battery capacity of above two-wheeled discharge cycle is as the ginseng of adjusting of next round discharge cycle Number calculates:

${\mathrm{SOC}}_{n+1}^{-}=1+\frac{C_{n-1}^{-}\·{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{-}\·C_n^{-}},C_n^{-}={\∫}_{t_1^{n-}}^{t_2^{n-}}i\left(\mathrm{\τ}\right)d\mathrm{\τ}$

WhereinRepresent the battery capacity of upper two-wheeled discharge cycle respectively,WithRepresent last round of electric discharge respectively The initial time in cycle and deadline.

In the above-described embodiments, temperature is divided into six intervals.This temperature range more can be refined into more multiregion district Between reach improve battery dump energy computational accuracy purpose.

It addition, when the initial value of current charge cycle or discharge cycle is carried out ampere-hour integral and calculating, it is possible to introduce one Individual weight coefficient, arranges different weights coefficients and is modified different temperature；Or along with continuing of charge and discharge process Continuous, change over time arranges different weights coefficients and is modified.

What the present invention also provided for a kind of SOC on-line parameter self-correction accurately calculates device, including charging SOC computing module: Regulation charging current is just；In electric discharge cut-off state, using the battery capacity of last round of charge cycle as next round charge cycle Setting parameter calculate:

${\mathrm{SOC}}_{n+1}^{+}=\frac{{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{+}},C_n^{+}={\∫}_{t_1^{n+}}^{t_2^{n+}}i\left(\mathrm{\τ}\right)d\mathrm{\τ}$

WhereinRepresent the battery capacity of last round of charge cycle,WithRepresent rising of last round of charge cycle respectively Time beginning and deadline；

Electric discharge SOC computing module: regulation discharge current is negative；In charge cutoff state, with the electricity of last round of discharge cycle Tankage calculates as the setting parameter of next round discharge cycle:

${\mathrm{SOC}}_{n+1}^{-}=\frac{{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{-}},C_n^{-}={\∫}_{t_1^{n-}}^{t_2^{n-}}i\left(\mathrm{\τ}\right)d\mathrm{\τ}$

WhereinRepresent the battery capacity of last round of discharge cycle,WithRepresent rising of last round of discharge cycle respectively Time beginning and deadline.This device is actually based on a kind of computer solution of the inventive method flow process, i.e. a kind of Software architecture, above-mentioned each module is each treatment progress corresponding with method flow or program.Due to Jie to said method The sufficiently clear that continues is complete, therefore is no longer described in detail this device.

Claims (10)

1. the Method for Accurate Calculation of a SOC on-line parameter self-correction, it is characterised in that

Charging SOC calculation procedure: regulation charging current is just；In electric discharge cut-off state, hold with the battery of last round of charge cycle Measure the setting parameter as next round charge cycle to calculate:

${\mathrm{SOC}}_{n+1}^{+}=\frac{{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{+}}$

WhereinRepresent the battery capacity of last round of charge cycle；

Electric discharge SOC calculation procedure: regulation discharge current is negative；In charge cutoff state, hold with the battery of last round of discharge cycle Measure the setting parameter as next round discharge cycle to calculate:

${\mathrm{SOC}}_{n+1}^{-}=1+\frac{{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{-}}$

WhereinRepresent the battery capacity of last round of discharge cycle.

The Method for Accurate Calculation of SOC on-line parameter self-correction the most according to claim 1, it is characterised in that

Charging SOC calculation procedure: regulation charging current is just；In electric discharge cut-off state, the battery of above two-wheeled charge cycle holds Measure the setting parameter as next round charge cycle to calculate:

${\mathrm{SOC}}_{n+1}^{+}=\frac{C_{n-1}^{+}\·{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{+}\·C_n^{+}}$

WhereinRepresent the battery capacity of upper two-wheeled charge cycle respectively；

Electric discharge SOC calculation procedure: regulation discharge current is negative；In charge cutoff state, the battery of above two-wheeled discharge cycle holds Measure the setting parameter as next round discharge cycle to calculate:

${\mathrm{SOC}}_{n+1}^{-}=1+\frac{C_{n-1}^{-}\·{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{-}\·C_n^{-}}$

WhereinRepresent the battery capacity of upper two-wheeled discharge cycle respectively.

The Method for Accurate Calculation of SOC on-line parameter self-correction the most according to claim 1, it is characterised in that fill each Electricity cut-off time all records temperature now, selects within the scope of the temperature that this temperature is corresponding, with the electricity of last round of discharge cycle Tankage calculates as the setting parameter of next round discharge cycle；Temperature now is recorded in each electric discharge cut-off time Degree, selects in this temperature range, using the battery capacity of last round of charge cycle as the setting parameter of next round charge cycle Calculate.

The Method for Accurate Calculation of SOC on-line parameter self-correction the most according to claim 2, it is characterised in that fill each Electricity cut-off time all records temperature now, selects within the scope of the temperature that this temperature is corresponding, the electricity of above two-wheeled discharge cycle Tankage calculates as the setting parameter of next round discharge cycle；Temperature now is recorded in each electric discharge cut-off time Degree, selects in this temperature range, and the battery capacity of above two-wheeled charge cycle is as the setting parameter of next round charge cycle Calculate.

5. according to the Method for Accurate Calculation of the SOC on-line parameter self-correction described in claim 3 or 4, it is characterised in that described temperature Degree scope is divided into six intervals :-10 DEG C～0 DEG C, 0 DEG C～10 DEG C, 10 DEG C～20 DEG C, 20 DEG C～40 DEG C, 40 DEG C～50 DEG C, 50 DEG C ～60 DEG C.

6. a SOC on-line parameter self-correction accurately calculate device, it is characterised in that

Charging SOC computing module: regulation charging current is just；In electric discharge cut-off state, hold with the battery of last round of charge cycle Measure the setting parameter as next round charge cycle to calculate:

${\mathrm{SOC}}_{n+1}^{+}=\frac{{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{+}}$

WhereinRepresent the battery capacity of last round of charge cycle；

Electric discharge SOC computing module: regulation discharge current is negative；In charge cutoff state, hold with the battery of last round of discharge cycle Measure the setting parameter as next round discharge cycle to calculate:

${\mathrm{SOC}}_{n+1}^{-}=\frac{{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{-}}$

WhereinRepresent the battery capacity of last round of discharge cycle.

SOC on-line parameter self-correction the most according to claim 6 accurately calculate device, it is characterised in that

Charging SOC computing module: regulation charging current is just；In electric discharge cut-off state, the battery of above two-wheeled charge cycle holds Measure the setting parameter as next round charge cycle to calculate:

${\mathrm{SOC}}_{n+1}^{+}=\frac{C_{n-1}^{+}\·{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{+}\·C_n^{+}}$

WhereinRepresent the battery capacity of upper two-wheeled charge cycle respectively；

Electric discharge SOC computing module: regulation discharge current is negative；In charge cutoff state, the battery of above two-wheeled discharge cycle holds Measure the setting parameter as next round discharge cycle to calculate:

${\mathrm{SOC}}_{n+1}^{-}=\frac{C_{n-1}^{-}\·{\∫}_0^{t}i\left(\mathrm{\τ}\right)d\mathrm{\τ}}{C_n^{-}\·C_n^{-}}$

WhereinRepresent the battery capacity of upper two-wheeled discharge cycle respectively.

SOC on-line parameter self-correction the most according to claim 6 accurately calculate device, it is characterised in that be included in every The individual charge cutoff moment all records temperature now, selects within the scope of the temperature that this temperature is corresponding, with last round of discharge cycle Battery capacity carry out the module that calculates as the setting parameter of next round discharge cycle；It is additionally included in each electric discharge cut-off time All record temperature now, select in this temperature range, charge as next round using the battery capacity of last round of charge cycle The setting parameter in cycle carries out the module calculated.

SOC on-line parameter self-correction the most according to claim 7 accurately calculate device, it is characterised in that be included in every The individual charge cutoff moment all records temperature now, selects within the scope of the temperature that this temperature is corresponding, above two-wheeled discharge cycle Battery capacity carry out the module that calculates as the setting parameter of next round discharge cycle；It is additionally included in each electric discharge cut-off time All recording temperature now, select in this temperature range, the battery capacity of above two-wheeled charge cycle is charged as next round The setting parameter in cycle carries out the module calculated.

SOC on-line parameter self-correction the most according to claim 8 or claim 9 accurately calculate device, it is characterised in that described Temperature range is divided into six intervals :-10 DEG C～0 DEG C, 0 DEG C～10 DEG C, 10 DEG C～20 DEG C, 20 DEG C～40 DEG C, 40 DEG C～50 DEG C, 50 DEG C～60 DEG C.