CN104868515B - A kind of method and device for obtaining charging current limit value and discharge current limit value - Google Patents
A kind of method and device for obtaining charging current limit value and discharge current limit value Download PDFInfo
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- CN104868515B CN104868515B CN201410659170.0A CN201410659170A CN104868515B CN 104868515 B CN104868515 B CN 104868515B CN 201410659170 A CN201410659170 A CN 201410659170A CN 104868515 B CN104868515 B CN 104868515B
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Abstract
The present invention provides a kind of method and device for obtaining charging current limit value and discharge current limit value, and the method for the acquisition charging current limit value includes：Obtain charging voltage value；The charging voltage value is compared with the rated voltage higher limit of charging object；When rated voltage higher limit of the charging voltage value more than the charging object, reduce initial charge current, until rated voltage higher limit of the current charging voltage value less than the charging object；According to the present charging current value and current charging voltage value and previous charging current value and previous charging voltage value, charging current limit value is calculated.
Description
Technical Field
The present invention relates to the field of charge or discharge current regulation. In particular to a method and a device for acquiring a charging current limit value and a discharging current limit value.
Background
When performing charging and discharging operations on a charging and discharging object, it is necessary to select the intensity of the signal according to the rated parameters of the charging and discharging object, for example, in the case of a rechargeable battery, a manufacturer specifies the upper charging voltage limit, the lower discharging voltage limit, the charging current limit, and the discharging current limit of the battery according to the performance of the battery, and ideally, the best effect can be obtained by performing the charging and discharging operations on the battery by using the parameters.
However, in the process of using the battery, the performance of the battery is changed continuously, for example, parameters such as internal resistance and capacitance are changed along with the use time, so that rated parameters are not suitable for use any more, and the working efficiency of the battery is reduced when the battery is charged and discharged by the rated parameters.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to obtain the charging and discharging current limit value more suitable for use according to the actual situation of the charging and discharging object so as to improve the working efficiency of the charging and discharging object.
The invention provides a method for acquiring a charging current limit value, which comprises the following steps: acquiring a charging voltage value; comparing the charging voltage value with a rated voltage upper limit value of a charging object; when the charging voltage value is larger than the rated voltage upper limit value of the charging object, reducing the initial charging current until the current charging voltage value is smaller than the rated voltage upper limit value of the charging object; and calculating to obtain a charging current limit value according to the current charging current value, the current charging voltage value, the previous charging current value and the previous charging voltage value.
Preferably, the method further comprises: and when the initial charging voltage value is less than or equal to the rated voltage upper limit value of the charging object, determining the current value of the initial charging current as the charging current limit value.
Preferably, the charging current limit is Ichlim ═ Ich (j) × f + Ich (j +1) × (1-f),
wherein
Umax is a rated voltage upper limit value of the charging target, U [ Ich (j +1) ] is the current charging voltage value, U [ Ich (j) ] is the previous charging voltage value, Ich (j) is the previous charging current value, Ich (j +1) is the current charging current value, and Ichlim is the charging current limit value.
Preferably, the current value of the initial charging current is less than or equal to a maximum charging current limit value of the charging object.
Preferably, the acquiring the charging voltage value includes: acquiring a charging current value and parameters of the charging object; and calculating the charging voltage value according to the acquired charging current value and the parameters of the charging object.
The invention also provides a method for obtaining the discharge current limit value, which comprises the following steps: acquiring a discharge voltage value; comparing the discharge voltage value with a rated voltage lower limit value of a discharge object; when the discharge voltage value is smaller than the rated voltage lower limit value of the discharge object, reducing the initial discharge current until the current discharge voltage value is larger than the rated voltage lower limit value of the discharge object; and calculating to obtain a discharge current limit value according to the current discharge current value, the current discharge voltage value, the previous discharge current value and the previous discharge voltage value.
Preferably, the method further comprises: and when the initial discharge voltage value is greater than or equal to the rated voltage lower limit value of the discharge object, determining the current value of the initial discharge current as the discharge current limit value.
Preferably, the discharge current limit is IDchlim ═ IDch (j) × f + IDch (j +1) × (1-f), where
Umin is a rated voltage lower limit value of the discharge object, U [ IDch (j +1) ] is the current discharge voltage value, U [ IDch (j) ] is the previous discharge voltage value, IDch (j) is the previous discharge current value, IDch (j +1) is the current discharge current value, and IDchlim is the discharge current limit value.
Preferably, a current value of the initial discharge current is less than or equal to a maximum discharge current limit value of the discharge object.
Preferably, the acquiring of the discharge voltage value includes: acquiring a discharge current value and parameters of the discharge object; and calculating a discharge voltage value according to the obtained discharge current value and the parameter of the discharge object.
Accordingly, the present invention provides a device for obtaining a charging current limit, comprising: an acquisition unit configured to acquire a charging voltage value; the comparison unit is used for comparing the charging voltage value with the rated voltage upper limit value of the charging object; the first charging current limit value acquisition unit is used for reducing the initial charging current when the charging voltage value is larger than the rated voltage upper limit value of the charging object until the current charging voltage value is smaller than the rated voltage upper limit value of the charging object; and calculating to obtain a charging current limit value according to the current charging current value, the current charging voltage value, the previous charging current value and the previous charging voltage value.
Preferably, the apparatus further comprises: and a second charging current limit value acquisition unit configured to determine a current value of the initial charging current as a charging current limit value when the initial charging voltage value is less than or equal to a rated voltage upper limit value of the charging target.
Preferably, the charging current limit is Ichlim ═ Ich (j) × f + Ich (j +1) × (1-f),
wherein
Umax is a rated voltage upper limit value of the charging target, U [ Ich (j +1) ] is the current charging voltage value, U [ Ich (j) ] is the previous charging voltage value, Ich (j) is the previous charging current value, Ich (j +1) is the current charging current value, and Ichlim is the charging current limit value.
Preferably, the current value of the initial charging current is less than or equal to a maximum charging current limit value of the charging object.
Preferably, the acquiring unit includes: a parameter acquiring subunit, configured to acquire a charging current value and a parameter of the charging object; and the voltage calculation subunit is used for calculating the charging voltage value according to the acquired charging current value and the parameter of the charging object.
The invention also provides a device for obtaining the discharge current limit value, which comprises: an acquisition unit for acquiring a discharge voltage value; the comparison unit is used for comparing the discharge voltage value with the lower limit value of the rated voltage of the discharge object; the first discharging current limit value obtaining unit is used for reducing the initial discharging current when the discharging voltage value is smaller than the rated voltage lower limit value of the discharging object until the current discharging voltage value is larger than the rated voltage lower limit value of the discharging object; and the current discharge current limiting value is calculated according to the current discharge current value, the current discharge voltage value, the previous discharge current value and the previous discharge voltage value.
Preferably, the apparatus further comprises: and a second discharge current limit value acquisition unit configured to determine a current value of the initial discharge current as a discharge current limit value when the initial discharge voltage value is greater than or equal to a rated voltage lower limit value of the discharge object.
Preferably, the discharge current limit is IDchlim ═ IDch (j) × f + IDch (j +1) × (1-f), where
Umin is a rated voltage lower limit value of the discharge object, U [ IDch (j +1) ] is the current discharge voltage value, U [ IDch (j) ] is the previous discharge voltage value, IDch (j) is the previous discharge current value, IDch (j +1) is the current discharge current value, and IDchlim is the discharge current limit value.
Preferably, a current value of the initial discharge current is less than or equal to a maximum discharge current limit value of the discharge object.
Preferably, the acquiring unit includes: a parameter obtaining subunit, configured to obtain a discharge current value and a parameter of the discharge object; and the voltage calculation subunit is used for calculating a discharge voltage value according to the obtained discharge current value and the parameter of the discharge object.
Compared with the prior art, the method and the device for acquiring the charging current limit value and the discharging current limit value provided by the invention can determine the critical point of the charging and discharging voltage by gradually adjusting the numerical value of the charging and discharging current and detecting the charging and discharging voltage, calculate the charging and discharging current limit value more suitable for use according to data at two ends of the critical point, and improve the working efficiency of the battery when charging or discharging by using the calculated charging and discharging current limit value.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
Fig. 1 is a flowchart of a method for obtaining a charging current limit according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for obtaining a charging current limit according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method of obtaining a discharge current limit provided by an embodiment of the present invention;
FIG. 4 is a flowchart of a method for obtaining a discharge current limit according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an apparatus for obtaining a charging current limit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an apparatus for obtaining a discharge current limit according to an embodiment of the present invention.
Detailed Description
Ideally, i.e. under the condition that the battery is not worn, the user only needs to use the battery according to the rated parameters to obtain the best effect, but in the actual use process, the rated parameters may not be suitable for use any more along with the wear of the battery, i.e. the following conditions may occur along with the wear of the battery: when the value of the charging current is equal to the rated charging current limit value, the resulting charging voltage value may be larger than the rated voltage upper limit value. To this end, the present embodiment provides a method for obtaining a charging current limit value to obtain a charging current limit value suitable for use, as shown in fig. 1, including:
and S11, acquiring a charging voltage value. Specifically, the charging object may be a rechargeable battery, or may be a rechargeable battery model established according to parameters of the rechargeable battery, and for an entity rechargeable battery, the voltage values at two ends of the entity rechargeable battery may be directly measured during charging, so as to obtain the charging voltage. Preferably, for the rechargeable battery model, S11 includes:
and acquiring a charging current value and parameters of the charging object. The parameters mainly comprise internal resistance, capacitance and other parameters of the rechargeable battery.
And calculating a charging voltage value according to the acquired charging current value and the parameters of the charging object. The method can utilize the rechargeable battery model to perform subsequent operation, and avoids the influence on the normal work of the battery caused by directly operating the solid battery.
And S12, comparing the charging voltage value with the rated voltage upper limit value of the charging object. The rechargeable battery has rated parameters that are determined by the performance of the battery, and the user should use the battery according to fixed parameters, which include the upper voltage limit, the lower voltage limit, the charging current limit, the discharging current limit, etc. of the battery in general.
S13, determining the current value of the initial charging current as a charging current limit value when the initial charging voltage value is less than or equal to the rated voltage upper limit value of the charging object;
and S14, when the charging voltage value is larger than the rated voltage upper limit value of the charging object, reducing the initial charging current until the current charging voltage value is smaller than the rated voltage upper limit value of the charging object, and calculating to obtain the charging current limit value according to the current charging current value, the current charging voltage value, the previous charging current value and the previous charging voltage value.
The method for obtaining the charging current limit value according to this embodiment determines the critical point of the charging voltage by gradually adjusting the value of the charging current and detecting the charging voltage, and calculates the charging current limit value more suitable for use according to the data at the two ends of the critical point, so that the charging efficiency can be improved when charging is performed by using the calculated charging current limit value. In practical application, the method can be applied to a charging object with frequent charging and discharging operations or easy loss, such as a rechargeable battery in an electric energy automobile, but because the battery needs to be frequently used in the driving process, the method cannot be directly used for the battery, a battery equivalent circuit corresponding to the rechargeable battery is established, a state space model of the voltage of a single battery is established to simulate the state of the rechargeable battery, and after the equivalent circuit obtains a charging current limiting value by using the method, a battery management system can be controlled to provide the limiting value for a vehicle controller, so that the charging performance of the vehicle control system on the vehicle-mounted rechargeable battery is improved.
In the present embodiment, a specific charging current limit value obtaining manner is provided, assuming that the rated voltage upper limit of the charging object is Umax, the selected initial charging current value is Ich (1), the charging duration is T, and then the corresponding charging voltage U [ Ich (1) ] is known, as shown in fig. 2, if U [ Ich (1) ] is less than or equal to Umax in S21, S22 is executed, and the current value Ich (1) of the initial charging current is determined as the charging current limit value. In the process, the value of the initial charging current value Ich (1) is particularly important, and if the value is far smaller than the rated charging current limit value, the situation that U [ Ich (1) ] < Umax inevitably occurs, but the judgment on Ich (1) is obviously not accurate enough, so that in an actual situation, the value of Ich (1) should be as close to the rated charging current limit value as possible, so that U [ Ich (1) ] > Umax can be executed in subsequent steps.
If U [ Ich (1) ] > Umax in S21, S23 is executed, the initial charging current value Ich (1) is reduced, for example, Ich (1) is multiplied by a reduction coefficient to obtain Ich (2), the charging duration T is performed again, then the corresponding charging voltage U [ Ich (2) ] can be known, then the relationship between U [ Ich (2) ] and Umax is judged, and the above steps are executed in a circulating manner until the two adjacent charging voltages meet the following conditions: if U [ Ich (j) ] > Umax and U [ Ich (j +1) ] < Umax (j ≧ 1) in S24 (i.e., it is determined whether the charging voltages at the j-th and j + 1-th times satisfy the above conditions), S25 is executed to calculate a charging current limit value more suitable for use based on Ich (j), U [ Ich (j) ], Ich (j +1), and U [ Ich (j +1) ] obtained in the above steps. It should be understood by those skilled in the art that the above-mentioned multiplication of the initial charging current value by a coefficient is for the purpose of reducing the value, and is not a limitation to the reduction operation manner, and other manners are also feasible in practical application, only the value of the charging current used in the next step is ensured to be smaller than the value of the charging current used in the previous step, and the smaller the difference between two adjacent charging currents is, the more accurate the obtained result is.
Preferably, the charging current limit in S14 may be calculated according to the following formula:
Ichlim＝Ich(j)*f+Ich(j+1)*(1-f)，
wherein
Umax is a rated voltage upper limit value of the charging target, U [ Ich (j +1) ] is the current charging voltage value, uuich (j) ] is the previous charging voltage value, Ich (j) is the previous charging current value, Ich (j +1) is the current charging current value, and Ichlim is the charging current limit value. The calculation method has the advantages of simple operation process, low requirement on hardware, high efficiency and suitability for practical application, and a person skilled in the art can understand that the calculation method is not unique and the calculation of the limit value of the charging current by other methods is also feasible.
Since the actual charging current limit is obviously reduced rather than larger than the known maximum current as the battery is worn in actual conditions, in order to improve the efficiency of the comparison operation, it is preferable that the current value of the initial charging current is smaller than or equal to the maximum charging current limit of the charging object, so as to ensure that the subsequent charging current is smaller than the maximum charging current limit.
The present embodiment provides a method for obtaining a discharge current limit, as shown in fig. 3, the method includes:
and S31, acquiring a discharge voltage value. Specifically, the discharge object may be a battery, or may be a discharge battery model established according to parameters of the discharge battery, and for an entity battery, the discharge voltage may be obtained by directly measuring voltage values at two ends of the entity battery during discharge. Preferably, for the discharge cell model, S31 includes:
and acquiring a discharge current value and parameters of the discharge object. The parameters mainly comprise internal resistance, capacitance and other parameters of the battery.
And calculating a discharge voltage value according to the obtained discharge current value and the parameter of the discharge object. The method can utilize the discharging battery model to carry out relevant operation, and avoids the influence on the normal work of the battery caused by directly operating the solid battery.
And S32, comparing the discharge voltage value with the lower limit value of the rated voltage of the discharge object. The battery has rated parameters that are determined by the performance of the battery, and the user should normally use the battery according to fixed parameters, which include the upper voltage limit, the lower voltage limit, the discharge current limit, etc. of the battery.
S33, determining the current value of the initial discharge current as a discharge current limit value when the initial discharge voltage value is greater than or equal to the rated voltage lower limit value of the discharge object;
and S34, when the discharge voltage value is smaller than the rated voltage lower limit value of the discharge object, reducing the initial discharge current until the current discharge voltage value is larger than the rated voltage lower limit value of the discharge object, and calculating to obtain the discharge current limit value according to the current discharge current value, the current discharge voltage value, the previous discharge current value and the previous discharge voltage value.
The method for obtaining the discharge current limit value according to this embodiment determines the critical point of the discharge voltage by gradually adjusting the discharge current value and detecting the discharge voltage, and calculates the discharge current limit value more suitable for use according to the data at the two ends of the critical point, so that the discharge efficiency can be improved when discharging is performed by using the calculated discharge current limit value. In practical application, the method can be applied to a discharging object with frequent charging and discharging operations or easy loss, such as a battery in an electric energy automobile, but because the battery needs to be frequently used in the driving process, the method cannot be directly used for the battery, a battery equivalent circuit corresponding to the battery is established, a state space model of the voltage of a single battery is established to simulate the state of the battery, and after the equivalent circuit obtains a discharging current limiting value by using the method, a battery management system can be controlled to provide the limiting value for a whole automobile controller, so that the discharging performance of the whole automobile control system on a vehicle-mounted battery is improved.
In the present embodiment, a specific discharge current limit value obtaining method is provided, assuming that a rated voltage lower limit of a discharge object is Umin, a selected initial discharge current value is IDch (1), and a discharge duration time T, and then a corresponding discharge voltage U [ IDch (1) ] can be obtained, as shown in fig. 4, if U [ IDch (1) ] is greater than or equal to Umin in S41, S42 is executed, and a current value IDch (1) of the initial discharge current is determined as a discharge current limit value. The value of the initial discharge current value IDch (1) is particularly important in the process, if the value is far smaller than the rated discharge current limit value, the situation that U [ IDch (1) ] is larger than Umin inevitably occurs, but the judgment of IDch (1) is obviously not accurate enough, so that in an actual situation, the value of IDch (1) should be as close to the rated discharge current limit value as possible, so that U [ IDch (1) ] is smaller than Umin to execute subsequent steps.
If U [ IDch (1) ] < Umin, executing S43, decreasing the initial discharge current value IDch (1), for example, multiplying IDch (1) by a reduction coefficient to obtain IDch (2), discharging again for a duration T, then knowing the corresponding discharge voltage U [ IDch (2) ], then judging the relationship between U [ IDch (2) ] and Umin, and executing the above steps in a circulating manner until two discharge voltages meet the following characteristics: u [ IDch (j) ] < Umin and U [ IDch (j +1) ] > Umin (j ≧ 1) in S44 (i.e., whether or not the discharge voltages at j-th and j + 1-th times satisfy the above conditions). Then S45 is executed to calculate a more suitable discharge current limiting value according to the IDch (j), U [ IDch (j) ] and IDch (j +1), U [ IDch (j +1) ] obtained in the above steps. It should be understood by those skilled in the art that the above-mentioned multiplication of the initial discharge current value by a coefficient is for the purpose of reducing the value, and is not a limitation to the reduction operation mode, and other modes are also feasible in practical application, only the value of the discharge current used in the next step is ensured to be smaller than the value of the previous discharge current, and the smaller the difference between two adjacent discharge currents is, the more accurate the obtained result is.
Preferably, the discharge current limit in S34 may be calculated according to the following formula:
IDchlim＝IDch(j)*f+IDch(j+1)*(1-f)，
wherein,
umin is a rated voltage lower limit value of the discharge object, U [ IDch (j +1) ] is the current discharge voltage value, uuidch (j) ] is the previous discharge voltage value, IDch (j) is the previous discharge current value, IDch (j +1) is the current discharge current value, and IDchlim is the discharge current limit value. The calculation method has the advantages of simple operation process, low requirement on hardware, high efficiency and suitability for practical application, and a person skilled in the art can understand that the calculation method is not unique and the calculation of the limit value of the discharge current by other methods is also feasible.
In order to improve the efficiency of the comparison operation, it is preferable that the current value of the initial discharge current is smaller than or equal to the maximum discharge current limit value of the discharge object, so as to ensure that the subsequent discharge currents are smaller than the maximum discharge current limit value.
The present embodiment provides an apparatus for obtaining a charging current limit value, as shown in fig. 5, the apparatus includes:
an acquisition unit 51 for acquiring a charging voltage value; in order not to affect the normal operating state of the rechargeable battery, it may also be possible to establish an equivalent circuit and a state model for the battery, and then obtain the charging voltage value through the equivalent circuit, preferably, the obtaining unit 51 includes:
a parameter acquiring subunit 511, configured to acquire a charging current value and a parameter of the charging object;
and the voltage calculation subunit 512 is configured to calculate the charging voltage value according to the acquired charging current value and the parameter of the charging object.
A comparison unit 52, configured to compare the charging voltage value with a rated voltage upper limit of a charging target;
a first charging current limit value obtaining unit 53, configured to reduce an initial charging current until a current charging voltage value is smaller than a rated voltage upper limit value of the charging object when the charging voltage value is larger than the rated voltage upper limit value of the charging object; and calculating to obtain a charging current limit value according to the current charging current value, the current charging voltage value, the previous charging current value and the previous charging voltage value.
Preferably, the apparatus further comprises:
a second charging current limit value obtaining unit 54 configured to determine the current value of the initial charging current as the charging current limit value when the initial charging voltage value is less than or equal to the rated voltage upper limit value of the charging target.
The method for obtaining the charging current limit value according to this embodiment determines the critical point of the charging voltage by gradually adjusting the value of the charging current and detecting the charging voltage, and calculates the charging current limit value more suitable for use according to the data at the two ends of the critical point, so that the charging efficiency can be improved when charging is performed by using the calculated charging current limit value.
Preferably, the charging current limit is
Ichlim＝Ich(j)*f+Ich(j+1)*(1-f)，
Wherein
Umax is a rated voltage upper limit value of the charging target, U [ Ich (j +1) ] is the current charging voltage value, U [ Ich (j) ] is the previous charging voltage value, Ich (j) is the previous charging current value, Ich (j +1) is the current charging current value, and Ichlim is the charging current limit value.
Since the actual charging current limit is obviously reduced rather than larger than the known maximum current limit in accordance with the loss of the battery in actual conditions, it is preferable that the current value of the initial charging current is less than or equal to the maximum charging current limit value of the charging object in order to improve the efficiency of the comparison operation.
Example four
The present embodiment provides an apparatus for obtaining a limit value of a discharge current, as shown in fig. 6, the apparatus includes:
an acquisition unit 61 for acquiring a discharge voltage value; in order not to affect the normal operating state of the battery, it is preferable to establish an equivalent circuit and a state model for the battery, and then obtain the discharge voltage value through the equivalent circuit, and preferably, the obtaining unit 61 includes:
a parameter obtaining subunit 611 configured to obtain a discharge current value and a parameter of the discharge object;
and a voltage calculating subunit 612, configured to calculate a discharge voltage value according to the obtained discharge current value and the parameter of the discharge object.
A comparison unit 62, configured to compare the discharge voltage value with a lower limit of a rated voltage of a discharge object;
a first discharging current limit value obtaining unit 63, configured to reduce the initial discharging current until the current discharging voltage value is greater than the rated voltage lower limit value of the discharging object when the discharging voltage value is less than the rated voltage lower limit value of the discharging object; and calculating to obtain a discharge current limit value according to the current discharge current value, the current discharge voltage value, the previous discharge current value and the previous discharge voltage value.
Preferably, the apparatus further comprises:
a second discharge current limit value obtaining unit 64 configured to determine the current value of the initial discharge current as the discharge current limit value when the initial discharge voltage value is greater than or equal to the rated voltage lower limit value of the discharge object.
The device for obtaining the discharge current limit value provided in this embodiment determines the critical point of the discharge voltage by gradually adjusting the value of the discharge current and detecting the discharge voltage, and calculates the discharge current limit value more suitable for use according to the data at the two ends of the critical point, so that the discharge efficiency can be improved when discharging is performed by using the calculated discharge current limit value.
Preferably, the discharge current limit is
IDchlim＝IDch(j)*f+IDch(j+1)*(1-f)，
Wherein
Umin is a rated voltage lower limit value of the discharge object, U [ IDch (j +1) ] is the current discharge voltage value, U [ IDch (j) ] is the previous discharge voltage value, IDch (j) is the previous discharge current value, IDch (j +1) is the current discharge current value, and IDchlim is the discharge current limit value.
Since the actual value of the discharge current limit is obviously reduced rather than larger than the known maximum current limit as the battery is worn in actual conditions, in order to improve the efficiency of the comparative operation, it is preferable that the current value of the initial discharge current is less than or equal to the maximum discharge current limit value of the discharge object.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. A method of obtaining a charging current limit, comprising:
acquiring a charging voltage value;
comparing the charging voltage value with a rated voltage upper limit value of a charging object;
when the charging voltage value is larger than the rated voltage upper limit value of the charging object, reducing the initial charging current until the current charging voltage value is smaller than the rated voltage upper limit value of the charging object; calculating to obtain a charging current limit value according to the current charging current value, the current charging voltage value, a previous charging current value and a previous charging voltage value, wherein the charging current limit value is
Ichlim＝Ich(j)*f+Ich(j+1)*(1-f)，
Wherein
Umax is a rated voltage upper limit value of the charging target, U [ Ich (j +1) ] is the current charging voltage value, U [ Ich (j) ] is the previous charging voltage value, Ich (j) is the previous charging current value, Ich (j +1) is the current charging current value, and Ichlim is the charging current limit value.
2. The method of claim 1, further comprising:
and when the initial charging voltage value is less than or equal to the rated voltage upper limit value of the charging object, determining the current value of the initial charging current as the charging current limit value.
3. The method of claim 1 or 2, wherein the obtaining a charging voltage value comprises:
acquiring a charging current value and parameters of the charging object;
and calculating the charging voltage value according to the acquired charging current value and the parameters of the charging object.
4. A method of obtaining a discharge current limit, comprising:
acquiring a discharge voltage value;
comparing the discharge voltage value with a rated voltage lower limit value of a discharge object;
when the discharge voltage value is smaller than the rated voltage lower limit value of the discharge object, reducing the initial discharge current until the current discharge voltage value is larger than the rated voltage lower limit value of the discharge object; calculating to obtain a discharge current limit value according to the current discharge current value, the current discharge voltage value, a previous discharge current value and a previous discharge voltage value, wherein the discharge current limit value is
IDchlim＝IDch(j)*f+IDch(j+1)*(1-f)，
Wherein
Umin is a rated voltage lower limit value of the discharge object, U [ IDch (j +1) ] is the current discharge voltage value, U [ IDch (j) ] is the previous discharge voltage value, IDch (j) is the previous discharge current value, IDch (j +1) is the current discharge current value, and IDchlim is the discharge current limit value.
5. The method of claim 4, further comprising:
and when the initial discharge voltage value is greater than or equal to the rated voltage lower limit value of the discharge object, determining the current value of the initial discharge current as the discharge current limit value.
6. The method of claim 4 or 5, wherein the obtaining a discharge voltage value comprises:
acquiring a discharge current value and parameters of the discharge object;
and calculating a discharge voltage value according to the obtained discharge current value and the parameter of the discharge object.
7. An apparatus for obtaining a charging current limit, comprising:
an acquisition unit configured to acquire a charging voltage value;
the comparison unit is used for comparing the charging voltage value with the rated voltage upper limit value of the charging object;
the first charging current limit value acquisition unit is used for reducing the initial charging current when the charging voltage value is larger than the rated voltage upper limit value of the charging object until the current charging voltage value is smaller than the rated voltage upper limit value of the charging object; calculating to obtain a charging current limit value according to the current charging current value, the current charging voltage value, a previous charging current value and a previous charging voltage value, wherein the charging current limit value is
Ichlim＝Ich(j)*f+Ich(j+1)*(1-f)，
Wherein
Umax is a rated voltage upper limit value of the charging target, U [ Ich (j +1) ] is the current charging voltage value, U [ Ich (j) ] is the previous charging voltage value, Ich (j) is the previous charging current value, Ich (j +1) is the current charging current value, and Ichlim is the charging current limit value.
8. An apparatus for obtaining a discharge current limit, comprising:
an acquisition unit for acquiring a discharge voltage value;
the comparison unit is used for comparing the discharge voltage value with the lower limit value of the rated voltage of the discharge object;
the first discharging current limit value obtaining unit is used for reducing the initial discharging current when the discharging voltage value is smaller than the rated voltage lower limit value of the discharging object until the current discharging voltage value is larger than the rated voltage lower limit value of the discharging object; calculating to obtain a discharge current limit value according to the current discharge current value, the current discharge voltage value, a previous discharge current value and a previous discharge voltage value, wherein the discharge current limit value is
IDchlim＝IDch(j)*f+IDch(j+1)*(1-f)，
Wherein
Umin is a rated voltage lower limit value of the discharge object, U [ IDch (j +1) ] is the current discharge voltage value, U [ IDch (j) ] is the previous discharge voltage value, IDch (j) is the previous discharge current value, IDch (j +1) is the current discharge current value, and IDchlim is the discharge current limit value.
Priority Applications (1)
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| KR102472906B1 (en) * | 2015-11-25 | 2022-12-01 | 삼성에스디아이 주식회사 | Battery Pack and Electric Vehicle Including The Same |
| CN109921118B (en) * | 2019-02-21 | 2021-01-26 | 北京长城华冠汽车科技股份有限公司 | Battery charging current control method and system |
| WO2022217389A1 (en) * | 2021-04-12 | 2022-10-20 | 浙江吉利控股集团有限公司 | Torque control method and torque control system for electric drive system |
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| CN1215240A (en) * | 1997-09-19 | 1999-04-28 | 急迫充电公司 | Charging apparatus and charging system |
| CN101340011A (en) * | 2008-08-07 | 2009-01-07 | 中兴通讯股份有限公司 | Intelligent charging method and apparatus |
| CN101443978A (en) * | 2006-05-15 | 2009-05-27 | 丰田自动车株式会社 | Charge and discharge control device and charge and discharge control method of power storage device, and electric vehicle |
| CN102163755A (en) * | 2010-02-24 | 2011-08-24 | 三洋电机株式会社 | Rechargeable battery charging method, rechargeable battery charge controlling device and battery pack |
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| US20120179435A1 (en) * | 2011-01-10 | 2012-07-12 | Ford Global Technologies, Llc | Method For Determining A Power Capability For A Battery |
| CN103326078A (en) * | 2012-03-23 | 2013-09-25 | 深圳富泰宏精密工业有限公司 | Mobile device charging method and system |
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| CN1215240A (en) * | 1997-09-19 | 1999-04-28 | 急迫充电公司 | Charging apparatus and charging system |
| CN101443978A (en) * | 2006-05-15 | 2009-05-27 | 丰田自动车株式会社 | Charge and discharge control device and charge and discharge control method of power storage device, and electric vehicle |
| CN101340011A (en) * | 2008-08-07 | 2009-01-07 | 中兴通讯股份有限公司 | Intelligent charging method and apparatus |
| CN102163755A (en) * | 2010-02-24 | 2011-08-24 | 三洋电机株式会社 | Rechargeable battery charging method, rechargeable battery charge controlling device and battery pack |
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