CN104833922B - The computational methods and device of battery charging and discharging current limit - Google Patents
The computational methods and device of battery charging and discharging current limit Download PDFInfo
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Abstract
The invention discloses a kind of computational methods and device of battery charging and discharging current limit, this method comprises the following steps：Obtain the current state-of-charge of element cell and current test temperature in battery bag；Current AC impedance and current offset voltage are calculated according to current state-of-charge and current test temperature and default AC impedance relation table and predesigned compensation voltage relationship meter；Estimation cell voltage is obtained according to current state-of-charge, current AC impedance and current offset voltage and calculates formula；Multiple charging current values and multiple discharge current values are determined, and battery voltage value is estimated according to corresponding to estimation cell voltage calculating formula calculates respectively；Battery charging and discharging current limit is calculated according to multiple charging current values and multiple discharge current values and corresponding estimation battery voltage value.The computational methods of the battery charging and discharging current limit of the embodiment of the present invention, battery charging and discharging current limit can be calculated in real time during battery use, the computational accuracy of battery charging and discharging current limit can be improved.
Description
Technical field
The present invention relates to cell art, more particularly to a kind of computational methods and one of battery charging and discharging current limit
The computing device of kind battery charging and discharging current limit.
Background technology
During electric automobile during traveling, entire car controller needs to obtain the power limit of battery, so battery need to be calculated
Charging and discharging currents limit value.Correlation technique is first to test battery bag mostly, obtains a charging and discharging currents limit value and looks into
It is worth table, and is stored in electronic control unit, looking into value table by inquiring about the charging and discharging currents limit value obtains the charge and discharge of battery afterwards
Electric current limit.
But correlation technique has the drawback that, the data looked into value table are fixed, and the parameter of battery used in battery
Cheng Zhonghui constantly changes, and deviation will occurs in the data obtained by looking into value table, so as to the charging and discharging currents limit value of battery
Precision it is relatively low.
The content of the invention
It is contemplated that at least solves one of technical problem in correlation technique to a certain extent.Therefore, the present invention
One purpose is to propose a kind of computational methods of battery charging and discharging current limit, it is possible to increase battery charging and discharging current limit
Computational accuracy.
It is another object of the present invention to propose a kind of computing device of battery charging and discharging current limit.
The computational methods for the battery charging and discharging current limit that embodiment proposes according to an aspect of the present invention, including following step
Suddenly：Obtain the current state-of-charge of element cell and current test temperature in battery bag；According to the current state-of-charge and institute
State current test temperature and default AC impedance relation table and predesigned compensation voltage relationship meter is calculated current AC impedance and worked as
Precompensation voltage；Estimation electricity is obtained according to the current state-of-charge, the current AC impedance and the current offset voltage
Cell voltage calculation formula；Multiple charging current values and multiple discharge current values are determined, and are calculated according to the estimation cell voltage
Formula calculates estimation battery voltage value corresponding to the multiple charging current value and multiple discharge current values respectively；According to described more
Estimated corresponding to individual charging current value and multiple discharge current values and the multiple charging current value and multiple discharge current values
Battery voltage value calculates battery charging and discharging current limit.
The computational methods of the battery charging and discharging current limit proposed according to embodiments of the present invention, process can be used in battery
In in real time calculate battery charging and discharging current limit, compared with the static state of correlation technique looks into value method, the calculating side of the embodiment of the present invention
Method can improve the computational accuracy of battery charging and discharging current limit.Also, the battery charge and discharge that will be calculated in real time by battery management system
Electric current limit is supplied to entire car controller, can improve the performance of whole-control system.
According to one embodiment of present invention, it is described according to the current state-of-charge, the current AC impedance and institute
Current offset voltage acquisition estimation cell voltage calculating formula is stated to specifically include：According to the current state-of-charge, described current
AC impedance and the current offset voltage calculate estimation voltage, and calculate the voltage between test voltage and the estimation voltage
Difference；The current state-of-charge, the current AC impedance and the current offset voltage are repaiied according to the voltage difference
Just；It is further right according to the current state-of-charge after amendment, the current AC impedance and the current offset voltage
The estimation voltage is modified calculates formula to obtain the final estimation cell voltage.
Wherein, calculate formula according to a specific embodiment of the invention, the estimation cell voltage and be：
Uest=Uocv_est+IRest+Uoff_est
Wherein, UestFor the estimation cell voltage, I tests electric current, R to be currentestFor the current friendship after the amendment
Flow impedance, Uoff_estFor the current offset voltage after the amendment, Uocv_estIt is described for the open-circuit voltage after amendment
Uocv_estCalculated and obtained by the current state-of-charge after the amendment.
According to one embodiment of present invention, it is described according to the multiple charging when testing battery charging current limit
Estimation battery voltage value counting cell charging current limit specifically includes corresponding to current value and the multiple charging current value：
By predetermined maximum voltage value successively with corresponding to the multiple charging current value estimate battery voltage value compared with；If the 1st
Estimation battery voltage value is less than the predetermined maximum voltage value corresponding to individual charging current value, then makees the 1st charging current value
For the battery charge limit value；If estimation battery voltage value is more than described preset most corresponding to j-th of charging current value
Estimation battery voltage value is less than the predetermined maximum voltage value corresponding to+1 charging current value of big magnitude of voltage and jth, then basis
Below equation calculates the battery charge limit value：
Wherein, Ichlim is the battery charge limit value, and Ich (j) is j-th of charging current value, Ich (j+
1) it is described+1 charging current value of jth, f is gain, UmaxFor the predetermined maximum voltage value, U [Ich (j+1)] is described the
Estimation battery voltage value corresponding to j+1 charging current value, U [Ich (j)] are to be estimated corresponding to j-th of charging current value
Battery voltage value, j are the positive integer more than or equal to 2.
According to another embodiment of the invention, it is described to be put according to the multiple when testing battery discharge current limit value
Estimation battery voltage value calculates battery discharge current limit value and specifically wrapped corresponding to electric current value and the multiple discharge current value
Include：By preset minimum voltage value successively with corresponding to the multiple discharge current value estimate battery voltage value compared with；If
Estimation battery voltage value is more than the preset minimum voltage value corresponding to 1st discharge current value, then by the 1st discharge current value
As the battery discharge current limit value；If estimation battery voltage value is less than described default corresponding to j-th of discharge current value
Estimation battery voltage value is more than the preset minimum voltage value corresponding to+1 discharge current value of minimum amount of voltage that and jth, then root
The battery discharge current limit value is calculated according to below equation：
Wherein, IDchlim is the battery discharge current limit value, and IDch (j) is j-th of discharge current value, IDch
(j+1) it is described+1 discharge current value of jth, f is gain, UminFor the preset minimum voltage value, U [IDch (j+1)] is institute
Estimation battery voltage value corresponding to+1 discharge current value of jth is stated, U [IDch (j)] is corresponding to j-th of discharge current value
Battery voltage value is estimated, j is the positive integer more than or equal to 2.
The computing device for the battery charging and discharging current limit that embodiment proposes according to a further aspect of the invention, including：Obtain
Module, for obtaining the current state-of-charge of element cell and current test temperature in battery bag；Estimation block, for according to institute
State current state-of-charge and the current test temperature and default AC impedance relation table and predesigned compensation voltage relationship meter
Calculate current AC impedance and current offset voltage, and according to the current state-of-charge, the current AC impedance and described work as
Precompensation voltage obtains estimation cell voltage and calculates formula；Current limit computing module, for determine multiple charging current values and
Multiple discharge current values, and formula is calculated according to the estimation cell voltage and calculates the multiple charging current value and multiple respectively
Estimation battery voltage value corresponding to discharge current value, and according to the multiple charging current value and multiple discharge current values and institute
State estimation battery voltage value corresponding to multiple charging current values and multiple discharge current values and calculate battery charging and discharging current limit.
The computing device of the battery charging and discharging current limit proposed according to embodiments of the present invention, process can be used in battery
In in real time calculate battery charging and discharging current limit, compared with the static state of correlation technique looks into value method, the calculating side of the embodiment of the present invention
Method can improve the computational accuracy of battery charging and discharging current limit.Also, the battery charge and discharge that will be calculated in real time by battery management system
Electric current limit is supplied to entire car controller, can improve the performance of whole-control system.
According to one embodiment of present invention, the estimation block is specifically used for：According to the current state-of-charge, described
Current AC impedance and the current offset voltage calculate estimation voltage, and calculate between test voltage and the estimation voltage
Voltage difference, and according to the voltage difference to the current state-of-charge, the current AC impedance and described when precompensation electricity
Pressure is modified, and according to the current state-of-charge after amendment, the current AC impedance and described when precompensation electricity
Pressure is further modified to the estimation voltage and calculates formula to obtain the final estimation cell voltage.
Wherein, according to the specific embodiment of the present invention, it is characterised in that the estimation cell voltage calculates formula
For：
Uest=Uocv_est+IRest+Uoff_est
Wherein, UestFor the estimation cell voltage, I tests electric current, R to be currentestFor the current friendship after the amendment
Flow impedance, Uoff_estFor the current offset voltage after the amendment, Uocv_estIt is described for the open-circuit voltage after amendment
Uocv_estCalculated and obtained by the current state-of-charge after the amendment.
According to one embodiment of present invention, when testing battery charging current limit, the current limit computing module
It is specifically used for：Predetermined maximum voltage value successively estimation battery voltage value corresponding with the multiple charging current value is compared
Compared with if estimating that battery voltage value is less than the predetermined maximum voltage value, and the 1st is filled corresponding to the 1st charging current value
Electric current value is as the battery charge limit value, and if estimation battery voltage value corresponding to j-th of charging current value
It is less than the default maximum more than estimation battery voltage value corresponding to+1 charging current value of the predetermined maximum voltage value and jth
Magnitude of voltage, then the battery charge limit value is calculated according to below equation：
Wherein, Ichlim is the battery charge limit value, and Ich (j) is j-th of charging current value, Ich (j+
1) it is described+1 charging current value of jth, f is gain, UmaxFor the predetermined maximum voltage value, U [Ich (j+1)] is described the
Estimation battery voltage value corresponding to j+1 charging current value, U [Ich (j)] are to be estimated corresponding to j-th of charging current value
Battery voltage value, j are the positive integer more than or equal to 2.
According to another embodiment of the invention, when testing battery discharge current limit value, the current limit calculates mould
Block is specifically used for：Preset minimum voltage value successively estimation battery voltage value corresponding with the multiple discharge current value is compared
Compared with if estimating that battery voltage value is more than the preset minimum voltage value, and the 1st is put corresponding to the 1st discharge current value
Electric current value is as the battery discharge current limit value, and if estimation battery voltage value corresponding to j-th of discharge current value
It is more than the default minimum less than estimation battery voltage value corresponding to+1 discharge current value of the preset minimum voltage value and jth
Magnitude of voltage, then the battery discharge current limit value is calculated according to below equation：
Wherein, IDchlim is the battery discharge current limit value, and IDch (j) is j-th of discharge current value, IDch
(j+1) it is described+1 discharge current value of jth, f is gain, UminFor the preset minimum voltage value, U [IDch (j+1)] is institute
Estimation battery voltage value corresponding to+1 discharge current value of jth is stated, U [IDch (j)] is corresponding to j-th of discharge current value
Battery voltage value is estimated, j is the positive integer more than or equal to 2.
Brief description of the drawings
Fig. 1 is the flow chart of the computational methods of battery charging and discharging current limit according to embodiments of the present invention；
Fig. 2 is that estimation battery is obtained in the computational methods of battery charging and discharging current limit according to an embodiment of the invention
The flow chart of voltage computing formula；
Fig. 3 is the flow chart according to the computational methods of the battery charging and discharging current limit of a specific embodiment of the invention；
And
Fig. 4 is the block diagram of the computing device of battery charging and discharging current limit according to embodiments of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the computational methods and device of the battery charging and discharging current limit of the embodiment of the present invention are described.
Fig. 1 is the flow chart of the computational methods of battery charging and discharging current limit according to embodiments of the present invention.Such as Fig. 1 institutes
Show, the computational methods of battery charging and discharging current limit comprise the following steps：
S1：Obtain the current state-of-charge of element cell and current test temperature in battery bag.
, wherein it is desired to illustrate, element cell can refer to minimum series unit battery in battery bag in battery bag.
Also need to illustrate, current time t+1 can be calculated according to previous moment t test electric current and test temperature
Current state-of-charge.Specifically, open-circuit voltage can be utilized by previous moment t test electric current and test temperature as input
Coordinate the current state-of-charge for calculating battery current time t+1 with current integration method, current state-of-charge can be designated as SOC1。
S2：According to current state-of-charge and current test temperature and default AC impedance relation table and predesigned compensation voltage
Relation table calculates current AC impedance and current offset voltage.
Wherein, default AC impedance relation table and predesigned compensation voltage relationship can be obtained by carrying out test to battery unit
Table.Specifically, HPPC (Hybrid Pulse Power Characteristic, mixing can be carried out to battery unit in battery bag
Pulse power is tested), and calculate AC impedance R and offset voltage of the battery under different state-of-charge SOC and different temperatures T
Uoff, so as to obtain default AC impedance relation table R=f (SOC, T) and predesigned compensation voltage relationship table Uoff=f (SOC, T).
Thus, according to current state-of-charge SOC1With current test temperature T1And relation table R=f (SOC, T) and Uoff=f
(SOC, T), using the current AC impedance of interpolation calculation and current offset voltage, R can be designated as respectively1And Uoff_1。
In addition, it is necessary to explanation, offset voltage is caused by the polarization and electrochemical reaction of battery.
S3：Estimation cell voltage is obtained according to current state-of-charge, current AC impedance and current offset voltage and calculates public affairs
Formula.
According to one embodiment of present invention, as shown in Fig. 2 according to current state-of-charge, current AC impedance and current
It is that step S3 is specifically included that offset voltage, which obtains estimation cell voltage and calculates formula,：
S31：Estimation voltage is calculated according to current state-of-charge, current AC impedance and current offset voltage, and calculates survey
Try voltage and estimate the voltage difference between voltage.
Specifically, can according to current state-of-charge, currently test electric current, current AC impedance and current offset voltage meter
Estimation voltage is calculated, formula is as follows：
Uest_1=Uocv_1+I1R1+Uoff_1
Wherein, Uest_1For current estimation voltage, I1For current test electric current, R1For current AC impedance, Uoff_1To be current
Offset voltage, Uocv_1For current open circuit voltage.
It should be noted that current open circuit voltage can be calculated by default open-circuit voltage relation table.Specifically, by electricity
Pool unit, which carries out test, can obtain default open-circuit voltage relation table.For example, under different temperatures T, battery list in battery bag is tested
Member different state-of-charge SOC and open-circuit voltage UocvRelation, obtain default open-circuit voltage relation table Uocv=f (SOC, T).By
This, according to current state-of-charge SOC1With current test temperature T1And relation table Uocv=f (SOC, T), utilizes interpolation calculation
Current open circuit voltage, U can be designated asocv_1。
S32：Current state-of-charge, current AC impedance and current offset voltage are modified according to voltage difference.
Wherein, test voltage can be labeled as Utest, then test voltage and estimation voltage between voltage difference delta U can be：ΔU
=Utest-Uest_1。
Assuming that the difference calculated using current integration method between the state-of-charge of battery and the state-of-charge of reality is Δ
SOC, the difference between the AC impedance and actual AC impedance that are calculated using default AC impedance relation table is Δ R, using pre-
If the difference between offset voltage and actual offset voltage that offset voltage relation table calculates is Δ Uoff, then have below equation into
It is vertical：
Wherein：It is partial differential of the voltage to state-of-charge SOC of battery unit,It is the voltage of battery unit
To AC impedance R partial differential,It is the voltage of battery unit to offset voltage UoffPartial differential.
Further, can incite somebody to actionLabeled as A, A calculating process is described below in detail.
First, in current state-of-charge SOC1Nearby take 2 points of (SOC1+ δ SOC) and (SOC1- δ SOC), according to default open circuit
Voltage relationship table Uocv=f (SOC, T) can calculate open-circuit voltage U1 and U2 corresponding to this 2 points respectively, wherein, δ SOC be one compared with
Small value, it is proposed that take (00.01] in some value, thenThus, can obtainValue.
Then, calculateValue.Due to, I × Δ R=Δ U, therefore
Finally, calculateValue.Due to Δ Uoff=Δ U；Therefore
Thus, obtainingWithValue after, Δ SOC, Δ R and Δ can be calculated according to below equation
Uoff：
Wherein, above formulaCan be by formula Derive.
As described above, Δ SOC, Δ R and Δ U can be obtainedoff, afterwards, according to Δ SOC, Δ R and Δ UoffCan be respectively to current
State-of-charge, current AC impedance and current offset voltage are modified, and specific formula is as follows：
S33：According to the current state-of-charge after amendment, current AC impedance and current offset voltage further to estimation
Voltage is modified calculates formula to obtain final estimation cell voltage.
Wherein, final estimation cell voltage, which calculates formula, to be：
Uest=Uocv_est+IRest+Uoff_est
Wherein, UestTo estimate cell voltage, I tests electric current, R to be currentestFor the current AC impedance after amendment,
Uoff_estFor the current offset voltage after amendment, Uocv_estFor the open-circuit voltage after amendment.
Wherein, Uocv_estPass through the current state-of-charge SOC after amendmentestCalculate and obtain, that is, say, can be according to amendment
Current state-of-charge SOC afterwardsestWith current test temperature T1And relation table Uocv=f (SOC, T), is repaiied using interpolation calculation
Open-circuit voltage U after justocv_est。
S4：Multiple charging current values and multiple discharge current values are determined, and formula difference is calculated according to estimation cell voltage
Calculate estimation battery voltage value corresponding to multiple charging current values and multiple discharge current values.
Specifically, predeterminable multiple charging current values, and calculate estimation cell voltage corresponding to multiple charging current values
Value.
Assuming that the pairs of maximum charging current values of battery unit is Ich, then predeterminable multiple charging current values be Ich* [1,
0.875,0.75,0.625,0.5,0.375,0.25,0.125,0], multiple charging current values can be denoted as to [Ich (1), Ich
(2), Ich (3) ..., Ich (9)], and battery is charged respectively with multiple charging current values, when the charging interval can be default
Between such as 10s.
After battery charging 10s, the state-of-charge for calculating battery is [SOC (1), SOC (2), SOC (3) ..., SOC (9)], profit
With these SOC values, pass through default open-circuit voltage relation table Uocv=f (SOC, T) and predesigned compensation voltage relationship table Uoff=f
(SOC, T) obtain corresponding to open-circuit voltage and offset voltage, then using estimating that cell voltage calculates formula and calculate multiple chargings
Estimation battery voltage value corresponding to current value, charging current value [Ich (1), Ich (2), Ich (3) ..., Ich (9)] is corresponding to be estimated
Calculating battery voltage value can be denoted as [U [Ich (1)], U [Ich (2)], U [Ich (3)] ..., U [Ich (9)]].
Also, predeterminable multiple discharge current values, and calculate estimation battery voltage value corresponding to multiple discharge current values.
Assuming that the maximum discharge current value IDch of battery, then predeterminable multiple discharge current values be IDch* [1,0.875,
0.75,0.625,0.5,0.375,0.25,0.125,0], [IDch (1), IDch (2), IDch (3) ..., IDch (9)] is denoted as,
And battery is discharged respectively with multiple discharge current values, discharge time can be preset time such as 10s.
After battery discharge 10s, the state-of-charge for calculating battery is [SOC (10), SOC (11), SOC (12) ..., SOC
(18)], using these SOC values, by presetting open-circuit voltage relation table Uocv=f (SOC, T) and predesigned compensation voltage relationship table
Uoff=f (SOC, T) obtain corresponding to open-circuit voltage and offset voltage, then using estimate cell voltage calculate formula calculate it is more
Estimation battery voltage value corresponding to individual discharge current value.Discharge current [IDch (1), IDch (2), IDch (3) ..., IDch (9)]
Corresponding magnitude of voltage is denoted as [U [IDch (1)], U [IDch (2)], U [IDch (3)] ..., U [IDch (9)]].
S5：According to multiple charging current values and multiple discharge current values and multiple charging current values and multiple discharge currents
Estimation battery voltage value calculates battery charging and discharging current limit corresponding to value.
According to one embodiment of present invention, when testing battery charging current limit, according to multiple charging current values with
And estimation battery voltage value counting cell charging current limit specifically includes corresponding to multiple charging current values：By default maximum electricity
Pressure value corresponding to multiple charging current values successively compared with estimating battery voltage value；If the 1st charging current value is corresponding
Estimation battery voltage value be less than predetermined maximum voltage value, then using the 1st charging current value as battery charge limit value；Such as
Estimation battery voltage value is more than+1 charging current value pair of predetermined maximum voltage value and jth corresponding to j-th of charging current value of fruit
The estimation battery voltage value answered is less than predetermined maximum voltage value, then according to below equation counting cell charging current limit：
Wherein, Ichlim is battery charge limit value, and Ich (j) is j-th of charging current value, and Ich (j+1) is jth+1
Individual charging current value, f are gain, UmaxFor predetermined maximum voltage value, U [Ich (j+1)] is corresponding to+1 charging current value of jth
Battery voltage value is estimated, U [Ich (j)] is estimation battery voltage value corresponding to j-th of charging current value, and j is more than or equal to 2
Positive integer.
That is, the purpose for presetting multiple charging current values is to calculate corresponding estimation battery electricity using these current values
Pressure value, multiple estimation battery voltage values can be obtained into battery charge limit value compared with battery maximum voltage value.
Specifically, the predetermined maximum voltage value of battery unit can be denoted as Umax, utilize the maximum voltage value of battery unit
UmaxAs initial voltage value, counting cell charging current limit, wherein, battery charge limit value can be denoted as Ichlim.
By estimation battery voltage value and predetermined maximum voltage corresponding to [Ich (1), Ich (2), Ich (3) ..., Ich (9)]
Value UmaxIt is compared.
If U [Ich (1)]<Umax, then battery charge limit value is Ichlim=Ich (1), calculates and stops.
Otherwise, i.e. U [Ich (1)] >=Umax, by U [Ich (j)] (j=2,3 ..., 9) successively with maximum voltage value UmaxThan
Compared with.
If U [Ich (j)] ＞ UmaxAnd U [Ich (j+1)] ＜ Umax, then gain f is calculated according to below equation：
Further according to below equation counting cell charging current limit Ichlim：
Ichlim=Ich (j) * f+Ich (j+1) * (1-f).
According to another embodiment of the invention, when testing battery discharge current limit value, according to multiple discharge current values
And estimation battery voltage value corresponding to multiple discharge current values calculates battery discharge current limit value and specifically included：By default minimum
Magnitude of voltage corresponding to multiple discharge current values successively compared with estimating battery voltage value；If the 1st discharge current value pair
The estimation battery voltage value answered is more than preset minimum voltage value, then using the 1st discharge current value as battery discharge current limit value；
If estimation battery voltage value is less than+1 discharge current value of preset minimum voltage value and jth corresponding to j-th of discharge current value
Corresponding estimation battery voltage value is more than preset minimum voltage value, then calculates battery discharge current limit value according to below equation：
Wherein, IDchlim is battery discharge current limit value, and IDch (j) is j-th of discharge current value, and IDch (j+1) is the
J+1 discharge current value, f are gain, UminFor preset minimum voltage value, U [IDch (j+1)] is+1 discharge current value pair of jth
The estimation battery voltage value answered, U [IDch (j)] are estimation battery voltage value corresponding to j-th discharge current value, j be more than etc.
In 2 positive integer.
That is, the purpose for presetting multiple discharge current values is to calculate corresponding estimation battery electricity using these current values
Pressure value, multiple estimation battery voltage values can be obtained into battery discharge current limit value compared with battery minimum amount of voltage that.
Specifically, the preset minimum voltage value of battery unit can be denoted as Umin, utilize the minimum amount of voltage that of battery unit
UminAs initial voltage value, battery discharge current limit value is calculated, wherein, battery discharge current limit value can be denoted as IDchlim.
By estimation battery voltage value corresponding to [IDch (1), IDch (2), IDch (3) ..., IDch (9)] and default minimum
Magnitude of voltage UminIt is compared.
If U [IDch (1)]>Umin, then battery discharge current limit value be taken as IDchlim=IDch (1), calculate and stop.
Otherwise, i.e. U [IDch (1)]≤Umin, by U [IDch (j)] (j=2,3 ..., 9) successively with minimum amount of voltage that UminEnter
Row compares.
If U [IDch (j)] ＜ UminAnd U [IDch (j+1)] ＞ Umin, then gain f is calculated according to below equation：
Further according to below equation counting cell charging current limit Ichlim：
IDchlim=IDch (j) * f+IDch (j+1) * (1-f).
In summary, as shown in figure 3, the computational methods of battery charging and discharging current limit of the embodiment of the present invention specifically include with
Lower step：
S101：Battery unit is tested, with obtain default open-circuit voltage relation table, default AC impedance relation table and
Predesigned compensation voltage relationship table.
S102：Calculate current state-of-charge, current AC impedance and current offset voltage.
S103：Current state-of-charge, current AC impedance and current offset voltage are modified, to obtain estimation battery
Voltage computing formula.
S104：With multiple charge/discharge current values to battery charging/discharging preset time, corresponding estimation cell voltage is calculated
Value.
S105：Calculate battery charging/discharging current limit.
To sum up, the computational methods of the battery charging and discharging current limit proposed according to embodiments of the present invention, can make in battery
Calculate battery charging and discharging current limit, compared with the static state of correlation technique looks into value method, the embodiment of the present invention in real time during
Computational methods can improve the computational accuracy of battery charging and discharging current limit.Also, the electricity that will be calculated in real time by battery management system
Pond charging and discharging currents limit value is supplied to entire car controller, can improve the performance of whole-control system.
In order to realize above-described embodiment, the present invention also proposes a kind of computing device of battery charging and discharging current limit.
Fig. 4 is the block diagram of the computing device of battery charging and discharging current limit according to embodiments of the present invention.Such as Fig. 4
Shown, the computing device of battery charging and discharging current limit includes：Acquisition module 1, estimation block 2 and current limit computing module 3.
Wherein, acquisition module 1 is used to obtain the current state-of-charge of element cell and current test temperature in battery bag.Need
It is noted that element cell can refer to minimum series unit battery in battery bag in battery bag.Also need to illustrate, obtain
Module 1 can calculate the current state-of-charge at current time t+1 according to previous moment t test electric current and test temperature.It is specific and
Speech, it can be coordinated using open-circuit voltage and current integration method and calculated by previous moment t test electric current and test temperature as input
Battery current time t+1 current state-of-charge, current state-of-charge can be designated as SOC1。
As shown in figure 4, estimation block 2 is connected with acquisition module 1, for according to current state-of-charge and current test temperature
And default AC impedance relation table and predesigned compensation voltage relationship meter calculate current AC impedance and current offset voltage, and root
Estimation cell voltage, which is obtained, according to current state-of-charge, current AC impedance and current offset voltage calculates formula.
Wherein, default AC impedance relation table and predesigned compensation voltage relationship can be obtained by carrying out test to battery unit
Table.Specifically, HPPC (Hybrid Pulse Power Characteristic, mixing can be carried out to battery unit in battery bag
Pulse power is tested), and calculate AC impedance R and offset voltage of the battery under different state-of-charge SOC and different temperatures T
Uoff, so as to obtain default AC impedance relation table R=f (SOC, T) and predesigned compensation voltage relationship table Uoff=f (SOC, T).
Thus, estimation block 2 can be according to current state-of-charge SOC1With current test temperature T1And relation table R=f
(SOC, T) and Uoff=f (SOC, T), using the current AC impedance of interpolation calculation and current offset voltage, R can be designated as respectively1
And Uoff_1。
In addition, it is necessary to explanation, offset voltage is caused by the polarization and electrochemical reaction of battery.
As shown in figure 4, current limit computing module 3 is connected with estimation block 2, for determining multiple charging current values and more
Individual discharge current value, and formula is calculated according to estimation cell voltage and calculates multiple charging current values and multiple discharge current values respectively
Corresponding estimation battery voltage value, and according to multiple charging current values and multiple discharge current values and multiple charging current values and
Estimation battery voltage value calculates battery charging and discharging current limit corresponding to multiple discharge current values.
Specifically, the predeterminable multiple charging current values of current limit computing module 3, and calculate multiple charging current values pair
The estimation battery voltage value answered.
Assuming that the pairs of maximum charging current values of battery unit is Ich, then predeterminable multiple charging current values be Ich* [1,
0.875,0.75,0.625,0.5,0.375,0.25,0.125,0], multiple charging current values can be denoted as to [Ich (1), Ich
(2), Ich (3) ..., Ich (9)], and battery is charged respectively with multiple charging current values, when the charging interval can be default
Between such as 10s.
After battery charging 10s, the state-of-charge that acquisition module 1 can calculate battery is [SOC (1), SOC (2), SOC
(3) ..., SOC (9)], estimation block 2 utilizes these SOC values, by presetting open-circuit voltage relation table Uocv=f (SOC, T) and pre-
If offset voltage relation table Uoff=f (SOC, T) obtain corresponding to open-circuit voltage and offset voltage, then current limit calculate mould
Block 3, which utilizes, estimates that cell voltage calculates formula and calculates estimation battery voltage value, charging current value corresponding to multiple charging current values
Estimation battery voltage value can be denoted as [U [Ich (1)], U [Ich corresponding to [Ich (1), Ich (2), Ich (3) ..., Ich (9)]
(2)], U [Ich (3)] ..., U [Ich (9)]].
Also, the predeterminable multiple discharge current values of current limit computing module 3, and calculate corresponding to multiple discharge current values
Estimate battery voltage value.
Assuming that the maximum discharge current value IDch of battery, then predeterminable multiple discharge current values be IDch* [1,0.875,
0.75,0.625,0.5,0.375,0.25,0.125,0], [IDch (1), IDch (2), IDch (3) ..., IDch (9)] is denoted as,
And battery is discharged respectively with multiple discharge current values, discharge time can be preset time such as 10s.
After battery discharge 10s, the state-of-charge that acquisition module 1 calculates battery is [SOC (10), SOC (11), SOC
(12) ..., SOC (18)], estimation block 2 utilizes these SOC values, by presetting open-circuit voltage relation table Uocv=f (SOC, T) and
Predesigned compensation voltage relationship table UoffOpen-circuit voltage and offset voltage corresponding to=f (SOC, T) acquisitions, then current limit calculating
Module 3, which utilizes, estimates that cell voltage calculates formula and calculates estimation battery voltage value corresponding to multiple discharge current values.Discharge current
Magnitude of voltage corresponding to [IDch (1), IDch (2), IDch (3) ..., IDch (9)] is denoted as [U [IDch (1)], U [IDch (2)], U
[IDch (3)] ..., U [IDch (9)]].
Wherein it should be noted that default open-circuit voltage relation table can be obtained by carrying out test to battery unit.Example
Such as, under different temperatures T, battery unit difference state-of-charge SOC and open-circuit voltage U in battery bag is testedocvRelation, obtain
Default open-circuit voltage relation table Uocv=f (SOC, T).Thus, according to current state-of-charge SOC1With current test temperature T1And
Relation table Uocv=f (SOC, T), using interpolation calculation current open circuit voltage, U can be designated asocv_1。
Thus, the computing device for the battery charging and discharging current limit that the embodiment of the present invention proposes, can be used in battery
Battery charging and discharging current limit, compared with the static state of correlation technique looks into value method, the calculating of the embodiment of the present invention are calculated in journey in real time
Method can improve the computational accuracy of battery charging and discharging current limit.Also, the battery calculated in real time is filled by battery management system
Discharge current limit value is supplied to entire car controller, can improve the performance of whole-control system.
According to one embodiment of present invention, estimation block 2 is specifically used for：According to current state-of-charge, current exchange resistance
Anti- and current offset voltage calculates estimation voltage, and calculates test voltage and estimate the voltage difference between voltage, and according to electricity
Pressure difference is modified to current state-of-charge, current AC impedance and current offset voltage, and according to the current lotus after amendment
Electricity condition, current AC impedance and current offset voltage are further modified to obtain final estimation battery to estimation voltage
Voltage computing formula.Wherein, according to the specific embodiment of the present invention, estimation cell voltage, which calculates formula, to be：
Uest=Uocv_est+IRest+Uoff_est
Wherein, UestTo estimate cell voltage, I tests electric current, R to be currentestFor the current AC impedance after amendment,
Uoff_estFor the current offset voltage after amendment, Uocv_estFor the open-circuit voltage after amendment, Uocv_estAfter amendment
Current state-of-charge, which calculates, to be obtained.
Specifically, estimation block 2 can according to current state-of-charge, currently test electric current, current AC impedance and current
Offset voltage calculates estimation voltage, and formula is as follows：
Uest_1=Uocv_1+I1R1+Uoff_1
Wherein, Uest_1For current estimation voltage, I1For current test electric current, R1For current AC impedance, Uoff_1To be current
Offset voltage, Uocv_1For current open circuit voltage, current open circuit voltage Uocv_1It can be calculated by default open-circuit voltage relation table
Arrive.
Specifically, test voltage can be labeled as Utest, then test voltage and estimation voltage between voltage difference delta U can be：
Δ U=Utest-Uest_1。
Assuming that the difference calculated using current integration method between the state-of-charge of battery and the state-of-charge of reality is Δ
SOC, the difference between the AC impedance and actual AC impedance that are calculated using default AC impedance relation table is Δ R, using pre-
If the difference between offset voltage and actual offset voltage that offset voltage relation table calculates is Δ Uoff, then have below equation into
It is vertical：
Wherein：It is partial differential of the voltage to state-of-charge SOC of battery unit,It is the voltage of battery unit
To AC impedance R partial differential,It is the voltage of battery unit to offset voltage UoffPartial differential.
Further, can incite somebody to actionLabeled as A, A calculating process is described below in detail.
First, in current state-of-charge SOC1Nearby take 2 points of (SOC1+ δ SOC) and (SOC1- δ SOC), according to default open circuit
Voltage relationship table Uocv=f (SOC, T) can calculate open-circuit voltage U1 and U2 corresponding to this 2 points respectively, wherein, δ SOC be one compared with
Small value, it is proposed that take (00.01] in some value, thenThus, can obtainValue.
Then, calculateValue.Due to, I × Δ R=Δ U, therefore
Finally, calculateValue.Due to Δ Uoff=Δ U；Therefore
Thus, obtainingWithValue after, Δ SOC, Δ R and Δ can be calculated according to below equation
Uoff：
Wherein, above formulaCan be by formula Derive.
As described above, Δ SOC, Δ R and Δ U can be obtainedoff, afterwards, according to Δ SOC, Δ R and Δ UoffCan be respectively to current
State-of-charge, current AC impedance and current offset voltage are modified, and specific formula is as follows：
Thus, it can be U that final estimation cell voltage, which calculates formula,est=Uocv_est+IRest +Uoff_est。
Wherein, Uocv_estPass through the current state-of-charge SOC after amendmentestCalculate and obtain, that is, say, can be according to amendment
Current state-of-charge SOC afterwardsestWith current test temperature T1And relation table Uocv=f (SOC, T), is repaiied using interpolation calculation
Open-circuit voltage U after justocv_est。
According to one embodiment of present invention, when testing battery charging current limit, current limit computing module 3 is specific
For：By predetermined maximum voltage value successively with corresponding to multiple charging current values estimate battery voltage value compared with, if the 1st
Estimation battery voltage value is less than predetermined maximum voltage value corresponding to individual charging current value, then using the 1st charging current value as electricity
Pond charging current limit value, and if estimation battery voltage value is more than predetermined maximum voltage value corresponding to j-th of charging current value
And estimation battery voltage value is less than predetermined maximum voltage value corresponding to+1 charging current value of jth, then is calculated according to below equation
Battery charge limit value：
Wherein, Ichlim is battery charge limit value, and Ich (j) is j-th of charging current value, and Ich (j+1) is jth+1
Individual charging current value, f are gain, UmaxFor predetermined maximum voltage value, U [Ich (j+1)] is corresponding to+1 charging current value of jth
Battery voltage value is estimated, U [Ich (j)] is estimation battery voltage value corresponding to j-th of charging current value, and j is more than or equal to 2
Positive integer.
That is, the purpose for presetting multiple charging current values is to calculate corresponding estimation battery electricity using these current values
Pressure value, multiple estimation battery voltage values can be obtained into battery charge limit value compared with battery maximum voltage value.
Specifically, the predetermined maximum voltage value of battery unit can be denoted as Umax, current limit computing module 3 is available
The maximum voltage value U of battery unitmaxAs initial voltage value, counting cell charging current limit, wherein, battery charge
Limit value can be denoted as Ichlim.
By estimation battery voltage value and predetermined maximum voltage corresponding to [Ich (1), Ich (2), Ich (3) ..., Ich (9)]
Value UmaxIt is compared.
If U [Ich (1)]<Umax, then battery charge limit value is Ichlim=Ich (1), calculates and stops.
Otherwise, i.e. U [Ich (1)] >=Umax, by U [Ich (j)] (j=2,3 ..., 9) successively with maximum voltage value UmaxThan
Compared with.
If U [Ich (j)] ＞ UmaxAnd U [Ich (j+1)] ＜ Umax, then gain f is calculated according to below equation：
Further according to below equation counting cell charging current limit Ichlim：
Ichlim=Ich (j) * f+Ich (j+1) * (1-f).
According to another embodiment of the invention, when testing battery discharge current limit value, current limit computing module 3 has
Body is used for：By preset minimum voltage value successively with corresponding to multiple discharge current values estimate battery voltage value compared with, if
Estimation battery voltage value is more than preset minimum voltage value corresponding to 1st discharge current value, then using the 1st discharge current value as
Battery discharge current limit value, and if estimation battery voltage value is less than preset minimum voltage corresponding to j-th of discharge current value
Estimation battery voltage value is more than preset minimum voltage value corresponding to value and+1 discharge current value of jth, then according to below equation meter
Calculate battery discharge current limit value：
Wherein, IDchlim is battery discharge current limit value, and IDch (j) is j-th of discharge current value, and IDch (j+1) is the
J+1 discharge current value, f are gain, UminFor preset minimum voltage value, U [IDch (j+1)] is+1 discharge current value pair of jth
The estimation battery voltage value answered, U [IDch (j)] are estimation battery voltage value corresponding to j-th discharge current value, j be more than etc.
In 2 positive integer.
That is, the purpose for presetting multiple discharge current values is to calculate corresponding estimation battery electricity using these current values
Pressure value, multiple estimation battery voltage values can be obtained into battery discharge current limit value compared with battery minimum amount of voltage that.
Specifically, the preset minimum voltage value of battery unit is denoted as Umin, current limit computing module 3 can utilize electric
The minimum amount of voltage that U of pool unitminAs initial voltage value, battery discharge current limit value is calculated, wherein, battery discharge current limit
Value can be denoted as IDchlim.
By estimation battery voltage value corresponding to [IDch (1), IDch (2), IDch (3) ..., IDch (9)] and default minimum
Magnitude of voltage UminIt is compared.
If U [IDch (1)]>Umin, then battery discharge current limit value be taken as IDchlim=IDch (1), calculate and stop.
Otherwise, i.e. U [IDch (1)]≤Umin, by U [IDch (j)] (j=2,3 ..., 9) successively with minimum amount of voltage that UminEnter
Row compares.
If U [IDch (j)] ＜ UminAnd U [IDch (j+1)] ＞ Umin, then gain f is calculated according to below equation：
Further according to below equation counting cell charging current limit Ichlim：
IDchlim=IDch (j) * f+IDch (j+1) * (1-f).
To sum up, the computing device of the battery charging and discharging current limit proposed according to embodiments of the present invention, can make in battery
Calculate battery charging and discharging current limit, compared with the static state of correlation technique looks into value method, the embodiment of the present invention in real time during
Computational methods can improve the computational accuracy of battery charging and discharging current limit.Also, the electricity that will be calculated in real time by battery management system
Pond charging and discharging currents limit value is supplied to entire car controller, can improve the performance of whole-control system.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the different embodiments or example and the feature of different embodiments or example described in this specification
Close and combine.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
Any process or method described otherwise above description in flow chart or herein is construed as, and represents to include
Module, fragment or the portion of the code of the executable instruction of one or more the step of being used to realize specific logical function or process
Point, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discuss suitable
Sequence, including according to involved function by it is basic simultaneously in the way of or in the opposite order, carry out perform function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
Expression or logic and/or step described otherwise above herein in flow charts, for example, being considered use
In the order list for the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system including the system of processor or other can be held from instruction
The system of row system, device or equipment instruction fetch and execute instruction) use, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium " can any can be included, store, communicate, propagate or pass
Defeated program is for instruction execution system, device or equipment or the dress used with reference to these instruction execution systems, device or equipment
Put.The more specifically example (non-exhaustive list) of computer-readable medium includes following：Electricity with one or more wiring
Connecting portion (electronic installation), portable computer diskette box (magnetic device), random access memory (RAM), read-only storage
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, computer-readable medium, which can even is that, to print the paper of described program thereon or other are suitable
Medium, because can then enter edlin, interpretation or if necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each several part of the present invention can be realized with hardware, software, firmware or combinations thereof.Above-mentioned
In embodiment, software that multiple steps or method can be performed in memory and by suitable instruction execution system with storage
Or firmware is realized.If, and in another embodiment, can be with well known in the art for example, realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, have suitable combinational logic gate circuit application specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that to realize all or part of step that above-described embodiment method carries
Suddenly it is that by program the hardware of correlation can be instructed to complete, described program can be stored in a kind of computer-readable storage medium
In matter, the program upon execution, including one or a combination set of the step of embodiment of the method.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, can also
That unit is individually physically present, can also two or more units be integrated in a module.Above-mentioned integrated mould
Block can both be realized in the form of hardware, can also be realized in the form of software function module.The integrated module is such as
Fruit is realized in the form of software function module and as independent production marketing or in use, can also be stored in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..Although have been shown and retouch above
Embodiments of the invention are stated, it is to be understood that above-described embodiment is exemplary, it is impossible to be interpreted as the limit to the present invention
System, one of ordinary skill in the art can be changed to above-described embodiment, change, replace and become within the scope of the invention
Type.
Claims (10)
1. a kind of computational methods of battery charging and discharging current limit, it is characterised in that comprise the following steps：
Obtain the current state-of-charge of element cell and current test temperature in battery bag；
According to the current state-of-charge and the current test temperature and default AC impedance relation table and predesigned compensation electricity
Relation table is pressed to calculate current AC impedance and current offset voltage；
Estimation battery voltage gauge is obtained according to the current state-of-charge, the current AC impedance and the current offset voltage
Calculate formula；
Multiple charging current values and multiple discharge current values are determined, and formula is calculated according to the estimation cell voltage and calculated respectively
Estimation battery voltage value corresponding to the multiple charging current value and multiple discharge current values；And
According to the multiple charging current value and multiple discharge current values and the multiple charging current value and multiple electric discharge electricity
Estimation battery voltage value calculates battery charging and discharging current limit corresponding to flow valuve.
2. the computational methods of battery charging and discharging current limit as claimed in claim 1, it is characterised in that work as described in the basis
Preceding state-of-charge, the current AC impedance and the current offset voltage obtain estimation cell voltage calculating formula and specifically wrapped
Include：
Estimation voltage is calculated according to the current state-of-charge, the current AC impedance and the current offset voltage, and counted
Calculate the voltage difference between test voltage and the estimation voltage；
The current state-of-charge, the current AC impedance and the current offset voltage are repaiied according to the voltage difference
Just；
It is further right according to the current state-of-charge after amendment, the current AC impedance and the current offset voltage
The estimation voltage is modified calculates formula to obtain the final estimation cell voltage.
3. the computational methods of battery charging and discharging current limit as claimed in claim 2, it is characterised in that the estimation battery electricity
Pressure calculation formula be：
Uest=Uocv_est+IRest+Uoff_est
Wherein, UestFor the estimation cell voltage, I tests electric current, R to be currentestFor the current exchange resistance after the amendment
It is anti-, Uoff_estFor the current offset voltage after the amendment, Uocv_estFor the open-circuit voltage after amendment, the Uocv_estIt is logical
The current state-of-charge calculating acquisition crossed after the amendment.
4. the computational methods of battery charging and discharging current limit as claimed in claim 1, it is characterised in that work as testing battery charging
It is described to estimate cell voltage according to corresponding to the multiple charging current value and the multiple charging current value during current limit
Value counting cell charging current limit specifically includes：
By predetermined maximum voltage value successively with corresponding to the multiple charging current value estimate battery voltage value compared with；
If estimation battery voltage value is less than the predetermined maximum voltage value corresponding to the 1st charging current value, the 1st is filled
Electric current value is as the battery charge limit value；
If estimation battery voltage value is more than the predetermined maximum voltage value corresponding to j-th of charging current value and jth+1 is filled
Estimation battery voltage value is less than the predetermined maximum voltage value corresponding to electric current value, then calculates the battery according to below equation
Charging current limit value：
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Wherein, Ichlim is the battery charge limit value, and Ich (j) is j-th of charging current value, and Ich (j+1) is
Described+1 charging current value of jth, f are gain, UmaxFor the predetermined maximum voltage value, U [Ich (j+1)] is the jth+1
Estimation battery voltage value corresponding to individual charging current value, U [Ich (j)] are estimation battery corresponding to j-th of charging current value
Magnitude of voltage, j are the positive integer more than or equal to 2.
5. the computational methods of battery charging and discharging current limit as claimed in claim 1, it is characterised in that when test battery discharge
It is described to estimate cell voltage according to corresponding to the multiple discharge current value and the multiple discharge current value during current limit
Value calculates battery discharge current limit value and specifically included：
By preset minimum voltage value successively with corresponding to the multiple discharge current value estimate battery voltage value compared with；
If estimation battery voltage value is more than the preset minimum voltage value corresponding to the 1st discharge current value, the 1st is put
Electric current value is as the battery discharge current limit value；
If estimation battery voltage value is less than the preset minimum voltage value corresponding to j-th of discharge current value and jth+1 is put
Estimation battery voltage value is more than the preset minimum voltage value corresponding to electric current value, then calculates the battery according to below equation
Discharge current limit value：
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<mi>U</mi>
<mi>min</mi>
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<mi>U</mi>
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Wherein, IDchlim is the battery discharge current limit value, and IDch (j) is j-th of discharge current value, IDch (j+1)
For described+1 discharge current value of jth, f is gain, UminFor the preset minimum voltage value, U [IDch (j+1)] is the jth
Estimation battery voltage value corresponding to+1 discharge current value, U [IDch (j)] are to be estimated corresponding to j-th of discharge current value
Battery voltage value, j are the positive integer more than or equal to 2.
A kind of 6. computing device of battery charging and discharging current limit, it is characterised in that including：
Acquisition module, for obtaining the current state-of-charge of element cell and current test temperature in battery bag；
Estimation block, for according to the current state-of-charge and the current test temperature and default AC impedance relation table
Current AC impedance and current offset voltage are calculated with predesigned compensation voltage relationship meter, and according to current state-of-charge, the institute
State current AC impedance and the current offset voltage obtains estimation cell voltage and calculates formula；And
Current limit computing module, for determining multiple charging current values and multiple discharge current values, and according to the estimation electricity
Cell voltage calculation formula calculates estimation battery voltage value corresponding to the multiple charging current value and multiple discharge current values respectively,
And according to the multiple charging current value and multiple discharge current values and the multiple charging current value and multiple discharge currents
Estimation battery voltage value calculates battery charging and discharging current limit corresponding to value.
7. the computing device of battery charging and discharging current limit as claimed in claim 6, it is characterised in that the estimation block,
It is specifically used for：
Estimation voltage is calculated according to the current state-of-charge, the current AC impedance and the current offset voltage, and counted
The voltage difference between test voltage and the estimation voltage is calculated, and according to the voltage difference to current state-of-charge, the institute
State current AC impedance and the current offset voltage is modified, and according to current state-of-charge, the institute after amendment
State current AC impedance and the current offset voltage is further modified with described in acquisition finally to the estimation voltage
Estimate that cell voltage calculates formula.
8. the computing device of battery charging and discharging current limit as claimed in claim 7, it is characterised in that the estimation battery electricity
Pressure calculation formula be：
Uest=Uocv_est+IRest+Uoff_est
Wherein, UestFor the estimation cell voltage, I tests electric current, R to be currentestFor the current exchange resistance after the amendment
It is anti-, Uoff_estFor the current offset voltage after the amendment, Uocv_estFor the open-circuit voltage after amendment, the Uocv_estIt is logical
The current state-of-charge calculating acquisition crossed after the amendment.
9. the computing device of battery charging and discharging current limit as claimed in claim 6, it is characterised in that work as testing battery charging
During current limit, the current limit computing module, it is specifically used for：
By predetermined maximum voltage value successively with corresponding to the multiple charging current value estimate battery voltage value compared with, if
Estimation battery voltage value is less than the predetermined maximum voltage value corresponding to 1st charging current value, then by the 1st charging current value
As the battery charge limit value, and described in if estimation battery voltage value is more than corresponding to j-th of charging current value
Estimation battery voltage value is less than the predetermined maximum voltage value corresponding to+1 charging current value of predetermined maximum voltage value and jth,
The battery charge limit value is then calculated according to below equation：
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<mo>-</mo>
<mi>U</mi>
<mo>[</mo>
<mi>Ich</mi>
<mrow>
<mo>(</mo>
<mi>j</mi>
<mo>+</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mo>]</mo>
</mrow>
</mfrac>
</mtd>
</mtr>
</mtable>
</mfenced>
Wherein, Ichlim is the battery charge limit value, and Ich (j) is j-th of charging current value, and Ich (j+1) is
Described+1 charging current value of jth, f are gain, UmaxFor the predetermined maximum voltage value, U [Ich (j+1)] is the jth+1
Estimation battery voltage value corresponding to individual charging current value, U [Ich (j)] are estimation battery corresponding to j-th of charging current value
Magnitude of voltage, j are the positive integer more than or equal to 2.
10. the computing device of battery charging and discharging current limit as claimed in claim 6, it is characterised in that when test battery is put
During electric current limit, the current limit computing module, it is specifically used for：
By preset minimum voltage value successively with corresponding to the multiple discharge current value estimate battery voltage value compared with, if
Estimation battery voltage value is more than the preset minimum voltage value corresponding to 1st discharge current value, then by the 1st discharge current value
As the battery discharge current limit value, and described in if estimation battery voltage value is less than corresponding to j-th of discharge current value
Estimation battery voltage value is more than the preset minimum voltage value corresponding to+1 discharge current value of preset minimum voltage value and jth,
The battery discharge current limit value is then calculated according to below equation：
<mfenced open='{' close=''>
<mtable>
<mtr>
<mtd>
<mi>IDchlim</mi>
<mo>=</mo>
<mi>IDch</mi>
<mrow>
<mo>(</mo>
<mi>j</mi>
<mo>)</mo>
</mrow>
<mo>*</mo>
<mi>f</mi>
<mo>+</mo>
<mi>IDch</mi>
<mrow>
<mo>(</mo>
<mi>j</mi>
<mo>+</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mo>*</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mi>f</mi>
<mo>)</mo>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mi>f</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>U</mi>
<mi>min</mi>
</msub>
<mo>-</mo>
<mi>U</mi>
<mo>[</mo>
<mi>IDch</mi>
<mrow>
<mo>(</mo>
<mi>j</mi>
<mo>+</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mo>]</mo>
</mrow>
<mrow>
<mi>U</mi>
<mo>[</mo>
<mi>IDch</mi>
<mrow>
<mo>(</mo>
<mi>j</mi>
<mo>)</mo>
</mrow>
<mo>]</mo>
<mo>-</mo>
<mi>U</mi>
<mo>[</mo>
<mi>IDch</mi>
<mrow>
<mo>(</mo>
<mi>j</mi>
<mo>+</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mo>]</mo>
</mrow>
</mfrac>
</mtd>
</mtr>
</mtable>
</mfenced>
Wherein, IDchlim is the battery discharge current limit value, and IDch (j) is j-th of discharge current value, IDch (j+1)
For described+1 discharge current value of jth, f is gain, UminFor the preset minimum voltage value, U [IDch (j+1)] is the jth
Estimation battery voltage value corresponding to+1 discharge current value, U [IDch (j)] are to be estimated corresponding to j-th of discharge current value
Battery voltage value, j are the positive integer more than or equal to 2.
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| CN106451592B (en) * | 2016-07-29 | 2019-04-05 | 北京车和家信息技术有限公司 | The control method of battery charging and discharging, the control equipment of battery charging and discharging and electric vehicle |
| CN106249165B (en) * | 2016-08-25 | 2019-03-29 | 超威电源有限公司 | A kind of test method that monomer lead acid storage battery superiority and inferiority determines |
| CN107490714A (en) * | 2016-09-14 | 2017-12-19 | 宝沃汽车（中国）有限公司 | Detection method, device and the vehicle of the battery bag charging and discharging currents of vehicle |
| CN109795469A (en) * | 2017-11-17 | 2019-05-24 | 郑州宇通客车股份有限公司 | A kind of battery charging and discharging current control method, system and vehicle |
| CN110873846B (en) * | 2018-08-31 | 2021-09-14 | 宁德时代新能源科技股份有限公司 | Current limit value acquisition method and device and storage medium |
| CN109541488B (en) * | 2018-11-26 | 2020-11-06 | 瑞浦能源有限公司 | Current control method based on battery load state |
| CN109818089B (en) * | 2019-01-21 | 2021-03-19 | 深圳猛犸电动科技有限公司 | Battery current limiting method and device |
| CN110703115B (en) * | 2019-10-30 | 2020-11-27 | 同济大学 | Online estimation method for average temperature of storage battery of electric vehicle |
| US11454673B2 (en) * | 2020-02-12 | 2022-09-27 | Karma Automotive Llc | Battery current limits estimation based on RC model |
| CN113300016B (en) * | 2021-05-21 | 2022-12-13 | 广州小鹏汽车科技有限公司 | Battery charging and discharging control method and device |
| CN114089205B (en) * | 2022-01-21 | 2022-05-03 | 三一汽车制造有限公司 | Charging limiting current detection method, device and system and storage medium |
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