CN109387784B - Method for estimating effective quasi-SOC (state of charge) by using multi-dimensional state and method for dynamically correcting SOC - Google Patents
Method for estimating effective quasi-SOC (state of charge) by using multi-dimensional state and method for dynamically correcting SOC Download PDFInfo
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Abstract
The invention provides a multi-dimensional state estimation efficiency SOC method, which comprises the following steps: taking a plurality of standard electric quantity points from 0 to 1 in the electric quantity state, and storing a temperature-end voltmeter of each standard electric quantity point corresponding to a standard charging and discharging multiplying power-end voltmeter of each standard electric quantity point corresponding to a standard temperature; obtaining the current terminal voltage of the current temperature and the charge-discharge multiplying power; and calculating the reference temperature, the charge and discharge multiplying power of each standard electric quantity point to the current temperature and the voltage compensation quantity of the charge and discharge multiplying power by using the temperature-terminal voltage meter and the charge and discharge multiplying power-terminal voltage meter, calculating the estimated terminal voltage of the current temperature and the charge and discharge multiplying power according to the voltage compensation quantity, the reference temperature and the terminal voltage of the charge and discharge multiplying power, and obtaining an electric quantity-terminal voltage curve to obtain an effective standard SOC corresponding to the current voltage. The invention increases the influence of SOC in voltage compensation and improves the accuracy of effective SOC. The invention also provides a method for dynamically correcting the SOC.
Description
Technical Field
The invention belongs to the field of battery state estimation, and particularly relates to a multi-dimensional state estimation method for correcting SOC (state of charge) and a method for dynamically correcting SOC.
Background
The accurate estimation of the State of Charge (SOC) of the battery is an important basis for the Charge and discharge control and power optimization management of the battery of the electric vehicle, directly affects the service life of the battery and the power performance of the vehicle, and can predict the driving range of the electric vehicle, however, the SOC of the battery is affected by many factors such as temperature, current and cycle number, and has obvious uncertainty and strong nonlinearity, which leads to the generally low accuracy of the current SOC estimation method, and therefore, the online estimation of the SOC is considered as the core and difficult technology of the research and design of the battery management system. The estimation method for the SOC of the power battery at home and abroad mainly comprises an internal resistance method, an ampere-hour integral method, an open-circuit voltage method, a Kalman filtering method, an observer method and a neural network method.
One conventional SOC estimation method utilizes
Estimating the SOC, wherein K is the correction quantity of ampere-hour integration method, SOCt is the SOC at the t moment, SOC0 is the initial SOC, CNFor the initial rated capacity, I is the present current, which is positive during discharge and negative during charge. For a correction coefficient K, a specific de SOC lookup table is obtained by mainly taking a difference value between a calibration SOC value and an ampere-hour integrated SOC value to determine a K value, the calibration SOC value is estimated through a current constant-current charging and discharging experiment in a laboratory, correction to a standard voltage value is carried out through temperature compensation and current compensation respectively, and the calibrated SOC value is obtained, wherein the temperature compensation and the current compensation are carried out in the same compensation within a certain range, and the method is a rough estimation mode.
Therefore, a method is needed that can optimize the multi-dimensional state estimation accuracy SOC and dynamically modify the SOC.
Disclosure of Invention
The invention aims to provide a method for optimizing an efficient SOC.
It is another object of the present invention to provide a method capable of dynamically correcting the K coefficient of AH integration to dynamically correct SOC, thereby improving the accuracy of SOC.
In order to achieve the above object, the present invention provides a method for estimating an effective quasi-SOC from a multi-dimensional state, comprising the steps of: taking N standard electric quantity points from 0 to 1 in the electric quantity state, wherein N is more than or equal to 3, and acquiring and storing a temperature-terminal voltage meter corresponding to each standard electric quantity point under a standard charge-discharge multiplying power and a charge-discharge multiplying power-terminal voltage meter corresponding to each standard electric quantity point under a standard temperature; (1) obtaining a current terminal voltage value V under the current temperature i and the current charge-discharge multiplying power m state; (2) setting one standard temperature as a reference temperature, setting one standard charge and discharge multiplying power as a reference charge and discharge multiplying power, calculating reference temperature, reference charge and discharge multiplying power respectively corresponding to N standard electric quantity points to a current temperature i and a voltage compensation quantity detaV under the state of the charge and discharge multiplying power m according to the temperature-terminal voltage table and the charge and discharge multiplying power-terminal voltage table, and calculating estimated terminal voltage Vt respectively corresponding to N standard electric quantity points of the current temperature i and the charge and discharge multiplying power m according to the voltage compensation quantity detaV, the reference temperature and the terminal voltage corresponding to the reference standard charge and discharge multiplying power; (3) and manufacturing a corresponding standard electric quantity-terminal voltage comparison curve according to the estimated terminal voltage Vt corresponding to the N standard electric quantity points respectively, and obtaining an effective standard SOC corresponding to the current terminal voltage value V according to the standard electric quantity-terminal voltage comparison curve.
Compared with the prior art, the method increases the influence of SOC parameters in the influence factors of the voltage compensation quantity, and makes the terminal voltage data under different SOCs, different temperatures and different charge-discharge multiplying powers (different currents) into corresponding forms, thereby accurately estimating the corresponding terminal voltage compensation quantity, enabling the terminal voltage compensation quantity obtained by calculation to be more accurate, and further improving the accuracy of the quasi-SOC. On the other hand, terminal voltage compensation quantity between the current temperature charge-discharge multiplying power and the reference temperature reference charge-discharge multiplying power under a plurality of SOC values is respectively calculated, so that a plurality of SOCs and corresponding terminal voltage values are estimated, a corresponding standard electric quantity-terminal voltage comparison curve is obtained, and an effective standard SOC temperature-terminal voltage table charge-discharge multiplying power-terminal voltage table closest to the real value is estimated by reversely deducing according to the curve and a real terminal voltage value V lookup table (a standard electric quantity-terminal voltage comparison curve) obtained by detection, so that the relative accuracy is improved.
Preferably, the temperature-terminal voltage meter comprises a temperature-terminal voltage meter corresponding to the charging state and a temperature-terminal voltage meter corresponding to the discharging state, the charge-discharge multiplying power-terminal voltage meter comprises a charge-discharge multiplying power-terminal voltage meter in the charging state and a charge-discharge multiplying power-terminal voltage meter in the discharging state, and the corresponding temperature-terminal voltage meter and the charge-discharge multiplying power-terminal voltage meter are selected according to the charging and discharging state in the step (2).
Preferably, the voltage compensation amount is a sum of a voltage compensation amount from a reference charging and discharging multiplying factor to a current charging and discharging multiplying factor at a reference temperature and a voltage compensation amount from a reference temperature to a current temperature at a reference charging and discharging multiplying factor.
Preferably, the standard charge and discharge rate has X to divide the charge and discharge rate state into a plurality of charge and discharge rate regions, the standard temperature has Y to divide the temperature state into a plurality of temperature regions, and X, Y is greater than or equal to 2; the temperature-terminal voltage meter comprises a plurality of temperature-terminal voltage meters corresponding to each standard charging and discharging multiplying power, and the charging and discharging multiplying power-terminal voltage meters comprise a plurality of charging and discharging multiplying power-terminal voltage meters corresponding to each standard temperature.
Preferably, a standard temperature in a temperature region where the current temperature is located is selected as a reference temperature, and a standard charge-discharge multiplying factor in a charge-discharge multiplying factor region where the current charge-discharge multiplying factor is located is selected as a reference charge-discharge multiplying factor; the method for calculating the voltage compensation from the reference temperature to the current temperature under the reference charge-discharge multiplying power comprises the following steps: calculating a voltage compensation quantity delta V _ T of each basic distance of a region where the current temperature is located under a reference charging and discharging multiplying power, acquiring a voltage compensation quantity delta VT between a standard temperature and the reference temperature of the temperature region under the reference charging and discharging multiplying power and a temperature distance L1 between the standard temperature and the current temperature, and calculating the voltage compensation quantity delta V from the reference temperature to the current temperature under the reference charging and discharging multiplying power according to the voltage compensation quantity delta V _ T, the voltage compensation quantity delta VT and the temperature distance L1T(ii) a The method for calculating the voltage compensation from the reference charge and discharge multiplying power to the current charge and discharge multiplying power at the reference temperature comprises the following steps: calculating a voltage compensation quantity delta V _ I of each basic distance of a charge and discharge multiplying power region where the current charge and discharge multiplying power is located at a reference temperature, obtaining a voltage compensation quantity delta VI between a standard charge and discharge multiplying power of the charge and discharge multiplying power region where the current charge and discharge multiplying power is located at the reference temperature and the reference charge and discharge multiplying power and a charge and discharge multiplying power distance L2 between the standard charge and discharge multiplying power and the current charge and discharge multiplying power, and calculating the voltage compensation quantity delta V _ I from the reference charge and discharge multiplying power to the current charge and discharge multiplying power at the reference temperature according to the voltage compensation quantity delta V _ I, the voltage compensation quantity delta VI and theC(ii) a Using detaV ═ Δ VT+ΔVCAnd calculating the voltage compensation amount detaV under the current temperature i and the charge-discharge multiplying power m states corresponding to the N standard electric quantity points respectively.
Preferably, in the step (2), a standard temperature is selected as a reference temperature according to the current temperature i, and a standard charge-discharge multiplying factor is selected as a reference charge-discharge multiplying factor according to the current charge-discharge multiplying factor m.
The invention also provides a method for dynamically correcting SOC, which comprises the following steps: accurate SOC of calculation＿CaSaid effective quasi SOC＿CaThe method equal to the multi-dimensional state estimation valid SOC calculates the obtained valid SOC; real-time computing ampere-hour SOC＿AHAs the value of the SOC, there is,
wherein the SOC＿AHIs SOC at time t, SOC0Is the starting SOC, CNThe current is positive during discharging, negative during charging, and the AH integral correction value is K; in the initial state, taking K as 1, calculating SOC＿AHAnd judging the ampere-hour SOC＿AHAnd efficiency standard SOC＿CaIf the deviation value between the values exceeds the preset range, the effective and accurate SOC is utilized if the deviation value between the values exceeds the preset range＿CaCorrecting the K value to obtain a new ampere-hour SOC＿AHAnd if not, not correcting the K value.
Compared with the prior art, the method for dynamically correcting the SOC updates the ampere-hour SOC in real time＿AHThe value of (1) is corrected in real time by continuously correcting the coefficient K to correct the SOC value, the coefficient K is optimized and is not in a stage mutation any more, so that the SOC value is ensured＿AHAccurate corrections can be made in real time.
Preferably, in the charging state, by
Correcting the value of K by
And correcting the K value.
Preferably, the ampere-hour SOC is judged＿AHAnd efficiency standard SOC＿CaWhether the deviation value exceeds the preset range specifically comprises the following steps: judging the ampere-hour SOC＿AHAnd efficiency standard SOC＿CaWhether the deviation value therebetween is 0.01 or more.
Drawings
FIG. 1 is a flow chart of the multi-dimensional state estimation efficient SOC of the present invention.
FIG. 2 is a schematic diagram of a method of dynamically correcting SOC according to the present invention.
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a method for estimating an effective SOC in a multi-dimensional state, which specifically includes the following steps:
(S11) 11 standard electric quantity points are taken from 0 to 1 in the electric quantity state, namely 11 points are arranged at equal intervals between 0 and 1, and a temperature-terminal voltage table corresponding to each standard electric quantity point under the standard charging and discharging multiplying power-terminal voltage table corresponding to each standard electric quantity point under the standard temperature is obtained and stored, wherein the data table can be stored in the form of a table (shown in table 1 and table 2) or other forms such as a graph (shown in fig. 2).
(S12) obtaining the current temperature i and the current terminal voltage value V in the current charge and discharge multiplying power m state.
(S13) one of the standard temperatures is set as a reference temperature, one of the standard charge and discharge multiplying power is set as a reference charge and discharge multiplying power, the reference temperature, the reference charge and discharge multiplying power to the current temperature i and the voltage compensation amount detaV under the state of the charge and discharge multiplying power m corresponding to 11 standard electric quantity points are calculated according to the temperature-terminal voltage table and the charge and discharge multiplying power-terminal voltage table, and the estimated terminal voltage Vt corresponding to the 11 standard electric quantity points of the current temperature i and the charge and discharge multiplying power m respectively is calculated according to the voltage compensation amount detaV, the reference temperature and the terminal voltage corresponding to the reference charge and discharge multiplying power. When the standard temperature is multiple, one of the multiple standard temperatures is selected as a reference temperature, and when only one standard temperature is available, the standard temperature is selected as the reference temperature; the standard charge and discharge rate may be one or more, and when the standard charge and discharge rate is more than one, one of the standard charge and discharge rates is selected as a reference charge and discharge rate, and when the standard charge and discharge rate is only one, the standard charge and discharge rate is selected as the reference charge and discharge rate.
(S14) manufacturing a corresponding standard electric quantity-terminal voltage comparison curve according to the estimated terminal voltage Vt corresponding to the 11 standard electric quantity points respectively, and obtaining an effective standard SOC corresponding to the current terminal voltage value V according to the standard electric quantity-terminal voltage comparison curve.
The charging and discharging multiplying power can be specifically represented by current, and at the moment, the specific charging and discharging multiplying power can be converted into corresponding current scales.
Of course, other standard temperatures may be used as the reference charge-discharge multiplying power, and other standard charge-discharge multiplying powers may be used as the reference charge-discharge multiplying power.
In this embodiment, N is equal to 11, and a plurality of standard electric quantity points with other numbers, such as 3, 4, 12, etc., may be taken.
Specifically, the temperature-terminal voltage meter includes a temperature-terminal voltage meter corresponding to the temperature-terminal voltage meter in the charged state and a temperature-terminal voltage meter corresponding to the temperature-terminal voltage meter in the discharged state, and the charge-discharge magnification-terminal voltage meter includes a charge-discharge magnification-terminal voltage meter in the charged state and a charge-discharge magnification-terminal voltage meter in the discharged state, and more specifically, the charge-discharge magnification includes a charge magnification and a discharge magnification, and in the charged state, the charge-discharge magnification in the charge-terminal voltage meter is specifically a charge magnification, that is, actually, in the charged state, the charge-discharge magnification-terminal voltage meter is a charge magnification-terminal voltage meter, and in the discharged state, the charge-discharge magnification-terminal voltage meter is specifically a discharge magnification, that is, in the discharged state, the temperature-terminal voltage meter and the charge-terminal voltage meter in the respective states are selected depending on the states in the charge-discharge state (S13) And calculating the voltage compensation amount detaV.
In general, the standard charge/discharge rate is set within 0-2C, and the range of the standard charge/discharge rate may be adjusted according to factors such as the application environment, for example, the standard charge/discharge rate has 3, 0C, 0.5C and 2C, the discharge state is divided into 2 charge/discharge rate regions, one of which is 0-0.5C and the other is 0.5-2C, and if the standard charge/discharge rate has 4, 0C, 0.2C, 0.5C and 2C, the discharge state is divided into 3 charge/discharge rate regions, one of which is 0-0.2C, one of which is 0.2-0.5C and the other is 0.5-2C, and the standard charge/discharge rate may be set to other numbers such as 2, 5, 6, etc. In order to accurately calculate the voltage compensation amount detaV corresponding to the charge and discharge multiplying power, two standard charge and discharge multiplying powers are two endpoint data of the standard charge and discharge multiplying power adjustment range, such as 0C and 2C of the invention. And acquiring a plurality of temperature-end voltmeters corresponding to each standard charge-discharge multiplying power in advance. When the voltage compensation amount detaV corresponding to the charge and discharge multiplying power is calculated, the charge and discharge multiplying power area where the current charge and discharge multiplying power is located is judged, and according to the charge and discharge state, a corresponding charge and discharge multiplying power-end voltmeter is selected to correspondingly calculate the voltage compensation amount detaV corresponding to the current charge and discharge multiplying power.
Similarly, the standard temperature is-10 ℃ to 50 ℃, and the standard temperature range can be adjusted according to actual requirements, for example, the standard temperature has 4, which are respectively: the temperature zones are divided into 3 zones of-10 deg.C, 25 deg.C and 50 deg.C, one zone being-10 deg.C, one zone being 10-25 deg.C and the other zone being 25 deg.C-50 deg.C, of course, the standard temperature can be set to 2, 3, 5, etc. numbers. In order to accurately calculate the voltage compensation amount detaV corresponding to the temperature, two standard temperatures are two endpoint data of the standard temperature adjustment range, such as-10 ℃ and 50 ℃ in the invention. And a plurality of charge and discharge multiplying power-terminal voltage meters corresponding to each standard temperature of the temperature-terminal voltage meters are stored in advance. When the voltage compensation amount detaV corresponding to the temperature is calculated, the temperature area where the current temperature is located is judged, and according to the charging and discharging states, a corresponding temperature-terminal voltage meter charging and discharging multiplying power-terminal voltage meter is selected to correspondingly calculate the voltage compensation amount detaV corresponding to the current temperature.
The method for estimating the effective quasi-SOC in the multi-dimensional state is illustrated, and specifically, the voltage compensation amount is a sum of a voltage compensation amount from a reference charge-discharge multiplying factor to a current charge-discharge multiplying factor at a reference temperature and a voltage compensation amount from the reference temperature to the current temperature at the reference charge-discharge multiplying factor.
Referring to table 1, it is a temperature-end voltmeter when the standard charge-discharge rate in the discharge state is 0C. Referring to table 2, there is shown a charge and discharge multiplying factor-terminal voltmeter having a standard temperature of 25 ℃.
| SOC | 10℃_0C V | 25℃_0C V | 10℃－25℃(△V_T) | 10 ℃ -25 ℃ (reference) (. DELTA.VT) |
| 0 | 3.393 | 3.21 | (3.21－3.393)/(25－10) | 3.21－3.393 |
| 0.1 | 3.366 | 3.383 | (3.383－3.366)/(25－10) | 3.383－3.366 |
| 0.2 | 3.441 | 3.442 | (3.442－3.441)/(25－10) | 3.442－3.441 |
| 0.3 | … | … | … | … |
| 0.4 | … | … | … | … |
| 0.5 | … | … | … | … |
| 0.6 | … | … | … | … |
| 0.7 | … | … | … | … |
| 0.8 | … | … | … | … |
| 0.9 | … | … | … | … |
| 1.0 | 4.136 | 4.17 | 0 | 0 |
TABLE 1
TABLE 2
Specifically, referring to table 1, table 2 and fig. 2, when the current temperature is 15 ℃, the current charge and discharge rate is 0.3C, the current temperature is in the temperature region of [10 ℃, 25 ℃ ], 25 ℃ is selected as the reference temperature, the current charge and discharge rate is in the charge and discharge rate region of [0C, 0.5C ], 0C is selected as the reference charge and discharge rate, and the valid quasi-SOC corresponding to 11 standard electric quantity points when the current terminal voltage value is 3.5V in the state of 15 ℃, 0.3C is calculated, specifically including the following steps:
taking 11 standard electric quantity points which are respectively 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1;
taking the standard electric quantity point 0 as an example, calculating voltage compensation amount detaV of terminal voltage of reference temperature reference charging and discharging multiplying power from 25 ℃ 0C to current temperature current charging and discharging multiplying power from 15 ℃ 0.3C corresponding to 11 standard electric quantity points respectively:
(1) calculating the voltage compensation quantity of terminal voltage from the reference temperature reference charging and discharging multiplying power of 25 ℃ 0C to the current temperature reference charging and discharging multiplying power of 15 ℃ 0C:
the current temperature of 15 ℃ belongs to a temperature region of 10 ℃, 25 DEG C]Look-up table 1 may yield: reference temperature refers to terminal voltage V corresponding to charge-discharge multiplying power of 25 ℃ 0C03.21V; terminal voltage V corresponding to reference charge-discharge multiplying power standard temperature of 10 ℃ and 0C10℃＝3.393V。
Under the condition of reference charge-discharge multiplying power of 0C, the voltage compensation quantity delta VT between the standard temperature of 10 ℃ and the reference temperature of 25 ℃ in the temperature region of 10-25 ℃ where the current temperature is 15℃ is V0－V10℃。
The current temperature is 15 ℃ in the area (10-25℃)]Voltage compensation amount per degree celsius (per basic distance) Δ V _ T ═ V0-V10℃)/(25-10)。
The temperature distance L1 between the standard temperature of 10 ℃ and the current temperature of 15 ℃ is 15-10.
Under the condition of reference charging and discharging multiplying power of 0C, the voltage compensation quantity delta V from the reference temperature value of 25 ℃ to the current temperature of 15 DEG CTΔ VT- Δ V _ T × (i-T) — (3.21-3.393) - (3.21-3.393)/(25-10) × (15-10) — 0.122V; wherein i is the current temperature, Tn is the standard temperature, and i-T is the temperature distance L1. The delta VT and the delta V _ T (i-T) are correspondingly added or subtracted according to the specifically selected standard temperature.
(2) Calculating the voltage compensation quantity of terminal voltage from the reference temperature reference charge-discharge multiplying factor of 25 ℃ 0C to the reference temperature current charge-discharge multiplying factor of 25 ℃ 0.5C:
the current charge-discharge multiplying power of 0.3C belongs to the charge-discharge multiplying power interval of 0-0.5C]Look-up table 2 may obtain: reference temperature refers to terminal voltage V corresponding to charge-discharge multiplying power of 25 ℃ 0C03.21V; terminal voltage V corresponding to standard charge-discharge multiplying power of 0.5C at reference temperature of 25 DEG C0.5C＝3.5V。
At a reference temperature of 25 ℃, the voltage compensation quantity delta VI between a standard charge and discharge multiplying factor 0.5C and a reference charge and discharge multiplying factor 0C in a charge and discharge multiplying factor region where the current charge and discharge multiplying factor 0.3C is located0-V0.5C。
The current charge-discharge multiplying factor is 0.3C in the charge-discharge multiplying factor region [0-0.5C]Voltage compensation amount Δ V _ TL2 (V _ TL 2) per charge/discharge rate unit (basic distance)0-V0.5C)/(0.5-0)。
The charge-discharge multiplying factor distance L2 from the standard charge-discharge multiplying factor of 0.5C to the current charge-discharge multiplying factor of 0.3C is 0.5-0.3
Voltage compensation quantity delta V from reference charge-discharge multiplying power to current charge-discharge multiplying power at reference temperatureCΔ VI- Δ V _ I × (B-j) ═ 0.084V (3.21-3) - (3.21-3)/(0.5-0) × (0.5-0.3); wherein j is the current charge-discharge multiplying factor, B is the standard charge-discharge multiplying factor, and B-j is the charge-discharge multiplying factor distance L2. And the delta VI and the delta V _ I (B-j) are correspondingly added or subtracted according to the specifically selected standard charge and discharge multiplying power.
(3) Calculating voltage compensation detaV between reference charging and discharging multiplying power reference temperature and current charging and discharging multiplying power current temperatureT+ΔVC＝-0.122+0.084＝-0.038V；
(4) Calculating an estimated terminal voltage Vt 1-V0-3.21- (-0.038) ═ 3.248V; wherein, Vt1 is the estimated terminal voltage corresponding to the standard electric quantity point of 0;
correspondingly calculating estimated terminal voltages Vt2 and Vt3 … Vt11 of other 10 standard electric quantity points according to the steps; vt2, Vt3 … Vt 11. Referring to fig. 2, a standard electric quantity-terminal voltage comparison curve is drawn according to Vt 1-Vt 11, and a corresponding SOC is found on the standard electric quantity-terminal voltage comparison curve according to the current voltage of 3.5V, i.e. the effective quasi-SOC.
With continued reference to FIG. 2, the present invention further provides a method for dynamically correcting SOC, wherein an effective quasi-SOC is calculated according to the method＿CaThen, the SOC value is movedThe state modification specifically comprises the following steps: real-time computing ampere-hour SOC＿AHAs the value of the SOC, there is,
wherein the SOC＿AHIs SOC at time t, SOC0Is the starting SOC, CNThe current is positive during discharging, negative during charging, and the AH integral correction value is K; in the initial state, taking K as 1, calculating SOC＿AHAnd judging the ampere-hour SOC＿AHAnd efficiency standard SOC＿CaIf the deviation value between the values exceeds the preset range, the effective and accurate SOC is utilized if the deviation value between the values exceeds the preset range＿CaCorrecting the K value to obtain a new ampere-hour SOC＿AHAnd if not, not correcting the K value.
In this embodiment, the ampere-hour SOC is determined＿AHAnd efficiency standard SOC＿CaWhether the deviation value exceeds the preset range specifically comprises the following steps: judging the ampere-hour SOC＿AHAnd efficiency standard SOC＿CaWhether the deviation value therebetween is 0.01 or more. Of course, the preset range value can also be adjusted according to factors such as the actual battery model and the application environment.
Specifically, according to different charging and discharging states of the battery, the K value is corrected in different modes, and in the charging state, the K value is corrected through the selection of different modes
Correcting the value of K by
Correcting the K value, wherein the K value ranges from 0.95 to 1.2 in a charging state and ranges from 0.9 to 1.2 in a discharging state.
In fig. 2, n represents temperature in the Δ V _ T diagram, and the diagram is a three-dimensional graph of SOC, n, and Δ V _ T, and represents a graph of Δ V _ T values corresponding to 11 SOC points at a certain temperature n. The Δ VT map is a graph of Δ VT values corresponding to 11 SOC points at a certain temperature n. In the Δ V _ I diagram, m represents a charge/discharge magnification, a three-dimensional graph composed of SOC, m, and Δ V _ I represents a graph of Δ V _ I values corresponding to 11 SOC points at a certain charge/discharge magnification m, and a Δ VI diagram represents a graph of Δ VI values corresponding to 11 SOC points at a certain charge/discharge magnification m. And obtaining voltage compensation amount detaV corresponding to 11 standard electric quantity points under the current temperature and the charge-discharge multiplying power according to the delta V _ T graph, the delta VT graph, the delta V _ I graph and the delta VI graph, and obtaining the estimated terminal voltage Vt according to the method.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto. Corresponding changes can be made reasonably within the scope of the inventive concept. Therefore, the protection scope of the present invention shall be subject to the claims.
Claims (9)
1. A method for estimating an effective quasi-SOC from a multi-dimensional state is characterized by comprising the following steps:
taking N standard electric quantity points from 0 to 1 in the electric quantity state, wherein N is more than or equal to 3, and acquiring and storing a temperature-terminal voltage meter corresponding to each standard electric quantity point under a standard charge-discharge multiplying power and a charge-discharge multiplying power-terminal voltage meter corresponding to each standard electric quantity point under a standard temperature;
(1) obtaining a current terminal voltage value V under the current temperature i and the current charge-discharge multiplying power m state;
(2) setting one standard temperature as a reference temperature, setting one standard charge and discharge multiplying power as a reference charge and discharge multiplying power, calculating reference temperature, reference charge and discharge multiplying power respectively corresponding to N standard electric quantity points to a current temperature i and a voltage compensation quantity detaV under the state of the charge and discharge multiplying power m according to the temperature-terminal voltage table and the charge and discharge multiplying power-terminal voltage table, and calculating estimated terminal voltage Vt respectively corresponding to the N standard electric quantity points of the current temperature i and the current charge and discharge multiplying power m according to the voltage compensation quantity detaV, the reference temperature and the terminal voltage corresponding to the reference charge and discharge multiplying power;
(3) and manufacturing a corresponding standard electric quantity-terminal voltage comparison curve according to the estimated terminal voltage Vt corresponding to the N standard electric quantity points respectively, and obtaining an effective standard SOC corresponding to the current terminal voltage value V according to the standard electric quantity-terminal voltage comparison curve.
2. The method for multi-dimensional state estimation of quasi-SOC as claimed in claim 1, wherein the temperature-terminal voltage meter includes a temperature-terminal voltage meter corresponding to a charging state and a temperature-terminal voltage meter corresponding to a discharging state, the charge/discharge multiplying power-terminal voltage meter includes a charge/discharge multiplying power-terminal voltage meter corresponding to a charging state and a charge/discharge multiplying power-terminal voltage meter corresponding to a discharging state, and the step (2) selects the corresponding temperature-terminal voltage meter and the charge/discharge multiplying power-terminal voltage meter according to the charging/discharging state.
3. The method of multi-dimensional state estimation of an effective quasi-SOC as claimed in claim 1, wherein the voltage compensation amount is a sum of a voltage compensation amount with reference to a charge-discharge magnification to a current charge-discharge magnification at a reference temperature and a voltage compensation amount with reference to a reference temperature to a current temperature at a reference charge-discharge magnification.
4. The method for multi-dimensional state estimation of an effective SOC of claim 3,
the standard charging and discharging multiplying power has X numbers to divide the charging and discharging multiplying power state into a plurality of charging and discharging multiplying power regions, the standard temperature has Y numbers to divide the temperature state into a plurality of temperature regions, and X, Y is larger than or equal to 2;
the temperature-terminal voltage meter comprises a plurality of temperature-terminal voltage meters corresponding to each standard charging and discharging multiplying power, and the charging and discharging multiplying power-terminal voltage meters comprise a plurality of charging and discharging multiplying power-terminal voltage meters corresponding to each standard temperature.
5. The method for multi-dimensional state estimation of an effective SOC of claim 4,
selecting a standard temperature in a temperature area where the current temperature is located as a reference temperature, and selecting a standard charge-discharge multiplying power in a charge-discharge multiplying power area where the current charge-discharge multiplying power is located as a reference charge-discharge multiplying power;
the method for calculating the voltage compensation from the reference temperature to the current temperature under the reference charge-discharge multiplying power comprises the following steps: calculating the temperature of the current temperature under the reference charge-discharge multiplying powerObtaining a voltage compensation quantity delta V _ T between a standard temperature and the reference temperature of a temperature area in which the area is positioned under the reference charging and discharging multiplying power and a temperature distance L1 between the standard temperature and the current temperature, and calculating the voltage compensation quantity delta V between the reference temperature and the current temperature under the reference charging and discharging multiplying power according to the voltage compensation quantity delta V _ T, the voltage compensation quantity delta VT and the temperature distance L1T；
The method for calculating the voltage compensation from the reference charge and discharge multiplying power to the current charge and discharge multiplying power at the reference temperature comprises the following steps: calculating a voltage compensation quantity delta V _ I of each basic distance of a charge and discharge multiplying power region where the current charge and discharge multiplying power is located at a reference temperature, obtaining a voltage compensation quantity delta VI between a standard charge and discharge multiplying power of the charge and discharge multiplying power region where the current charge and discharge multiplying power is located at the reference temperature and the reference charge and discharge multiplying power and a charge and discharge multiplying power distance L2 between the standard charge and discharge multiplying power and the current charge and discharge multiplying power, and calculating the voltage compensation quantity delta V _ I from the reference charge and discharge multiplying power to the current charge and discharge multiplying power at the reference temperature according to the voltage compensation quantity delta V _ I, the voltage compensation quantity delta VI and theC；
Using detaV ═ Δ VT+ΔVCAnd calculating the voltage compensation amount detaV under the current temperature i and the charge-discharge multiplying power m states corresponding to the N standard electric quantity points respectively.
6. The method according to claim 1, wherein in step (2), a standard temperature is selected as a reference temperature according to the current temperature i, and a standard charge-discharge rate is selected as a reference charge-discharge rate according to the current charge-discharge rate m.
7. A method for dynamically modifying an SOC, comprising the steps of:
accurate SOC of calculation＿CaSaid effective quasi SOC＿CaEquivalent SOC calculated by the method for multi-dimensional state estimation equivalent SOC according to any of claims 1-6;
real-time computing ampere-hour SOC＿AHAs the value of the SOC, there is,
wherein the SOC＿AHIs SOC at time t, SOC0Is the starting SOC, CNThe initial rated capacity is adopted, I is the current, and K is an AH integral correction quantity;
in the initial state, taking K as 1, calculating SOC＿AHAnd judging the ampere-hour SOC＿AHAnd efficiency standard SOC＿CaIf the deviation value between the values exceeds the preset range, the effective and accurate SOC is utilized if the deviation value between the values exceeds the preset range＿CaCorrecting the K value to obtain a new ampere-hour SOC＿AHAnd if not, not correcting the K value.
8. The method of dynamically modifying SOC of claim 7, wherein during the state of charge, the SOC is corrected by
Correcting the value of K by
And correcting the K value.
9. The method of dynamically modifying SOC of claim 7, wherein the ampere-hour SOC is determined＿AHAnd efficiency standard SOC＿CaWhether the deviation value exceeds the preset range specifically comprises the following steps: judging the ampere-hour SOC＿AHAnd efficiency standard SOC＿CaWhether the deviation value therebetween is 0.01 or more.
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