CN113533964A - Calculation method and device for displaying state of charge - Google Patents
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Abstract
The invention belongs to the technical field of new energy automobiles, and particularly relates to a calculation method and device for displaying a charge state. During the discharging process, the SOC is calculated at the current state of chargeMeterWhen the sum of the set discharge minimum value a% and the set error value b% is larger than or equal to the sum, passing through an acceleration factor KpMake the current display state of charge SOCDisplay deviceLess than the current calculated state of charge SOCMeterAnd SOCMeterAnd SOCDisplay deviceThe difference value is larger and larger, and partial electric quantity is hidden; at the present state of charge SOCMeterLess than the sum, by a deceleration factor KNMake SOC equal toDisplay deviceIs still less than SOCMeterBut SOCMeterAnd SOCDisplay deviceThe difference value is smaller and smaller, so that the hidden electric quantity is slowly released. Because the battery is charged according to the current displayState SOCDisplay deviceDisplaying and currently displaying the state of charge SOCDisplay deviceAlways kept less than the current calculated state of charge SOCMeterEven if the tail end calibration is triggered at the discharging tail end, the difference between the finally displayed SOC and the SOC before the tail end calibration is triggered is not large, the influence on a driver is not large, and the phenomenon that the vehicle is anchored due to the fact that the tail end calibration is triggered by the discharging tail end and the SOC jumps to zero is avoided.
Description
Technical Field
The invention belongs to the technical field of new energy automobiles, and particularly relates to a calculation method and device for displaying a charge state.
Background
Under the background of higher and higher environmental requirements, the proportion of electric vehicles in traditional fuel vehicles is higher and higher, which is the direction of future vehicle development and is also the focus of research in the automobile field. The power battery is used as a power source of the electric automobile, is a core component which affects key performance of the whole automobile, directly affects dynamic performance and endurance capacity of the electric automobile, the electric automobile can display the remaining State of Charge (SOC) of the electric automobile on an instrument panel of the automobile, and a driver can judge endurance mileage and duration according to the magnitude of a Charge State display value. Further, the state of charge indicated value is a state of charge calculated value.
At present, the commonly used methods for calculating the state of charge of the battery include an ampere-hour integration method, an OCV-SOC calibration method, a Kalman filtering method, a neural network method and the like. The ampere-hour integration method is used for calculating the charging capacity or the discharging capacity through integration of current and time, and the SOC accumulated error calculated by the method is high; the OCV-SOC calibration method is characterized in that batteries are placed for a period of time under the condition of no load to obtain Vmax and Vmin of single batteries of a battery system, and SOC of the battery system is obtained by inquiring an OCV-SOC table, wherein the method generally needs to be placed for a long time and needs to avoid a platform period, particularly a lithium iron phosphate battery core, and the obtaining calibration probability is low and the using condition is difficult; the Kalman filtering is to obtain the battery voltage and SOC by inputting the model parameters of the battery system, such as charging and discharging current, temperature, battery residual capacity, ohmic internal resistance, polarization internal resistance and the like, the method has higher requirements on the accuracy of the model and the input parameters, and the calculated SOC error is higher when the model is inaccurate or the input parameters have errors; the neural network method is to obtain the SOC through mass data training after a network model is established, the method needs mass effective data input training, the training data and the training method affect a calculation result, a large amount of calculation resources are needed, and the requirement on a chip is high.
Overall, the SOC calculated by these conventional methods deviates from the actual SOC. To correct this offset, the vehicle has built in a tip calibration algorithm to correct the offset so that the displayed SOC is closer to the true SOC. However, when the discharge end triggers the end calibration, a phenomenon that the display SOC jumps to zero easily occurs, resulting in vehicle breakdown. For example, the SOC displayed on the dashboard is originally 8%, and the driver estimates the distance that can be traveled according to 8% of remaining power to reach the destination, but after the vehicle auto-triggering end calibration, the displayed SOC may jump from 8% directly to 2% or even 0, and the 2% of remaining power will cause the driver to break down the vehicle during traveling and fail to reach the destination.
Disclosure of Invention
The invention provides a calculation method and a calculation device for displaying a charge state, which are used for solving the problem that in the prior art, the vehicle is anchored because SOC jump is zero due to the fact that a discharge tail end triggers tail end calibration.
In order to solve the technical problem, the technical scheme of the invention comprises the following steps:
the invention discloses a calculation method for displaying a charge state, which comprises the following steps:
1) judging the current calculation state of charge (SOC) when the battery is in a discharging stateMeterWhether the sum of the set discharge minimum value a% and the set error value b% is larger than or equal to:
if the current state of charge SOC is calculatedMeterIf the sum is larger than or equal to the sum, the SOC is determined according to the initial state of charge0Acceleration factor KpAnd initial state of charge SOC0And the current calculation state of charge SOCMeterDifference value Δ SOC of1And calculating to obtain the current display state of charge (SOC)Display device：
SOCDisplay device＝SOC0-Kp*ΔSOC1
In the formula, the acceleration factor KpComprises the following steps:
in the formula, a% of the set minimum discharge value is determined by the vehicle discharge depth, b% of the set error value is determined by the maximum allowable error of the battery management system, and x is a set coefficient;
if the current state of charge SOC is calculatedMeterIf the sum is smaller than the sum, the discharge minimum value a% and the deceleration factor K are setNAnd setting a minimum discharge value a% and a current calculated state of charge (SOC)MeterDifference value Δ SOC of2And calculating to obtain the current display state of charge (SOC)Display device：
SOCDisplay device＝a％-KN*ΔSOC2
In the formula, the deceleration factor KNComprises the following steps:
2) according to the current display state of charge SOCDisplay deviceAnd displaying the state of charge of the battery.
The beneficial effects of the above technical scheme are: the method does not calculate the SOC at present any moreMeterDisplay is performed directly, but: at the present state of charge SOCMeterWhen the sum of the set discharge minimum value a% and the set error value b% is larger than or equal to the sum, passing through an acceleration factor KpMake the current display state of charge SOCDisplay deviceLess than the current calculated state of charge SOCMeterAnd, over time, currently displays the state of charge SOCDisplay deviceDeviation from the current calculated state of charge SOCMeterIncreasingly, it is intended to hide part of the power; at the present state of charge SOCMeterLess than the sum, by a deceleration factor KNTo make the current display state of charge SOCDisplay deviceIs still less than the current calculated state of charge SOCMeterBut over time, the current display state of charge SOCDisplay deviceDeviation from the current calculated state of charge SOCMeterThe hidden electric quantity is gradually released when the electric quantity is smaller and smaller. Because the battery displays the SOC according to the current state of chargeDisplay deviceDisplaying and currently displaying the state of charge SOCDisplay deviceAlways kept less than the current calculated state of charge SOCMeterEven if the tail end calibration is triggered at the discharging tail end, the difference between the finally displayed SOC and the SOC before the tail end calibration is triggered is not large, the influence on a driver is not large, and the phenomenon that the vehicle is anchored due to the fact that the tail end calibration is triggered by the discharging tail end and the SOC jumps to zero is avoided.
As a further improvement of the method, when the battery is in the charging state, the current calculation state of charge SOC is judgedMeterWhether the sum of the set discharge minimum value a% and the set error value b% is larger than:
if the current state of charge SOC is calculatedMeterIf the sum is larger than or equal to the sum, the discharge minimum value a% and the acceleration factor K are setpAnd the current calculation state of charge SOCMeterDifference Δ SOC from a set minimum discharge a%3And calculating to obtain the current display state of charge (SOC)Display device：
SOCDisplay device＝a％+Kp*ΔSOC3
If the current state of charge SOC is calculatedMeterIf the sum is less than the above value, the SOC is determined according to the initial state of charge0A deceleration factor KNAnd the current calculation state of charge SOCMeterAnd initial state of charge SOC0Difference value Δ SOC of4And calculating to obtain the current display state of charge (SOC)Display device：
SOCDisplay device＝SOC0+KN*ΔSOC4。
As a further development of the method, in order to determine Δ SOC accurately1And Δ SOC2Said initial state of charge SOC0And the current calculation state of charge SOCMeterDifference value Δ SOC of1The set minimum discharge value a% and the current calculated state of charge SOCMeterDifference of (2)ΔSOC2Respectively as follows:
in the formula, Q is the initial rated capacity; i is a discharge current; k is an adjustment coefficient which is the product of a battery temperature coefficient, a battery life coefficient and a battery consistency coefficient, or the product of the battery temperature coefficient and the battery life coefficient; delta SOC1The corresponding discharge time is t 1-t 2; delta SOC2The corresponding discharge time is t 3-t 4.
As a further improvement of the method, said current calculated state of charge SOCMeterDifference Δ SOC from a set minimum discharge a%3The current calculation state of charge SOCMeterAnd initial state of charge SOC0Difference value Δ SOC of4Respectively as follows:
in the formula, Q is the initial rated capacity; i.e. i2Is a charging current; k is an adjustment coefficient which is the product of a battery temperature coefficient, a battery life coefficient and a battery consistency coefficient, or the product of the battery temperature coefficient and the battery life coefficient; delta SOC3The corresponding charging time is t 5-t 6; delta SOC4The corresponding charging time is t 7-t 8.
As a further improvement of the method, the set coefficient x is: x is k1-k2N, wherein k1、k2For the set parameter, n is a parameter representing the degree of cell attenuation, and k1And k2Are all greater than 0.
As a further improvement of the method, in step 1), the parameter n representing the degree of battery degradation is determined according to the ratio of the accumulated charging capacity to the initial rated capacity in the charging and discharging processes of the battery, and each ratio corresponds to the parameter n representing the degree of battery degradation.
As a further improvement of the method, the ratio is divided into different intervals according to the cycle times when the capacity of the battery is attenuated to a set multiple of the initial rated capacity, wherein one interval corresponds to a parameter n representing the attenuation degree of the battery; and determining a parameter representing the attenuation degree of the battery according to the interval to which the ratio belongs.
As a further improvement of the process, k1＝1.1，k2＝0.1。
The invention also provides a charge state display computing device, which comprises a memory and a processor, wherein the processor is used for executing instructions stored in the memory to realize the above introduced charge state display computing method, and the same effect as the method is achieved.
Drawings
FIG. 1 is a derived acceleration factor K of the present inventionpAnd a deceleration factor KNA desired calculated state of charge and a schematic showing the state of charge;
fig. 2 is a schematic of the state of charge of the present invention as a function of n.
Detailed Description
The method comprises the following steps:
in the battery discharging process, the formula of the traditional ampere-hour integration method is as follows:
wherein SOC is the current state of charge calculated by the traditional ampere-hour integration method, SOC0To an initial state of charge, i1For discharge current, Q is the initial rated capacity.
Because the traditional ampere-hour integration method has higher accumulated error and the capacity can be changed along with the use of the battery, the capacity can not be changed any moreFor the initial rated capacity Q, the conventional ampere-hour integration method is not used directly, but some improvement is made on the basis of the conventional ampere-hour integration method. The general improvement is to increase the cell temperature coefficient K during integration over timeTCoefficient of battery life KSOHCoefficient of uniformity with battery KYForming a formula of an improved ampere-hour integration method shown as a formula (2), and obtaining a calculated charge state in the discharging process of the battery as follows:
the invention discloses a method for calculating a charge state display value, which introduces an acceleration factor K on the basis of an equation (2)pAnd release factor KNObtaining the display state of charge SOCDisplay device. Compared with the mode of the formula (2), in the discharging process of the battery, when the calculated state of charge is more than a certain SOC value, the acceleration factor K is adoptedpMake SOCDisplay deviceSpecific SOCMeterSmall and with increasing depth of discharge, SOCDisplay deviceOff SOCMeterTo an increasingly greater extent; adopting a release factor K when the calculated state of charge is below a certain SOC valueNMake SOCDisplay deviceSpecific SOCMeterSmall but with increasing depth of discharge, SOCDisplay deviceOff SOCMeterTo a lesser and lesser extent. Further, as the number of charge/discharge cycles of the battery increases, the state of charge SOC is displayed in the same mannerDisplay deviceLower, SOCDisplay deviceAnd SOCMeterThe deviation value of (a) becomes smaller and smaller.
In this embodiment, a set discharge minimum value a% and a set error value b% need to be determined. For example, the SOC range of the vehicle is 20% to 100%, and then a% is 20%; if the maximum allowable error of the battery management system is 8%, b% ═ 8%.
The display state of charge SOCDisplay deviceThe calculation method is applied to the power automobile and comprises the following specific steps:
step 1, calculating according to the formula (2) to obtain the current calculation state of charge SOC when the battery is in a discharging stateMeterAnd determining SOCMeterAnd the sum of the set discharge minimum value a% and the set error value b% is as follows:
if SOCMeterNot less than (a% + b%), according to the initial state of charge SOC0Acceleration factor KpAnd initial state of charge SOC0And the current calculation state of charge SOCMeterDifference value Δ SOC of1And calculating to obtain the current display state of charge (SOC)Display device：
SOCDisplay device＝SOC0-Kp*ΔSOC1 (3)
In the formula, Δ SOC1And an acceleration factor KpRespectively as follows:
delta SOC in the formula (4)1The corresponding discharge time is t 1-t 2; k is an adjustment coefficient, and the value is as follows:
K＝KT*KSOH*KY (6)
in the formula (5), k1、k2For a set parameter, k1And k2Are all greater than 0, and the values thereof can be respectively k1＝1.1，k20.1; n is a parameter representing the attenuation degree of the battery, and the accumulated charging capacity C is obtained in the charging and discharging process of the batteryTired ofAnd determining the ratio of the initial rated capacity Q to the initial rated capacity Q, wherein each ratio corresponds to a parameter n representing the attenuation degree of the battery, and the specific determination method is described in detail below.
If SOCMeter< (a% + b%), the discharge minimum value is set to be a%, and the deceleration factor K is set to beNAnd setting a minimum discharge value a% and a current calculated state of charge (SOC)MeterDifference value Δ SOC of2And calculating to obtain the current display state of charge (SOC)Display device：
SOCDisplay device＝a％-KN*ΔSOC2 (7)
In the formula, Δ SOC2And a deceleration factor KNRespectively as follows:
delta SOC in the formula (8)2The corresponding discharge time is t 3-t 4; k is the same as formula (6), and K is in formula (9)1、k2Is also k1＝1.1，k2＝0.1。
Step 2, calculating the current display state of charge SOC according to the formula (3) or the formula (7)Display deviceAnd displaying on the instrument panel.
How n in the formulae (5) and (9) takes on its value will be described below. n is a parameter representing the degree of attenuation of the cell, according to CTired ofDetermination of/Q, CTired ofThe accumulated charging capacity is the accumulated charging capacity in the charging and discharging process of the battery. If the number of cycles at which the battery capacity decays to 80% of the initial rated capacity Q is M, the value of n is determined from table 1:
TABLE 1
| CTired of/Q | n |
| [0，M/8) | 1 |
| [M/8，2M/8) | 2 |
| [2M/8，3M/8) | 3 |
| [3M/8，4M/8) | 4 |
| [4M/8，5M/8) | 5 |
| [5M/8，6M/8) | 6 |
| [6M/8，7M/8) | 7 |
| [7M/8，M) | 8 |
The acceleration factor K is given below in conjunction with FIGS. 1 and 2pAnd release factor KNThe derivation process of (1) specifically includes the following steps 1) to 3).
1) As shown in FIG. 1, the state of charge SOC is calculated assuming the battery is in a more ideal state during dischargeMeterThe correspondence with time t is shown by the straight line segment AB in fig. 1. The intersection points of the straight line segment, the y axis (SOC) and the x axis (time t) are respectively as follows: a (0, 100%), B (T, 0). Finding out D point on the straight line segment, the ordinate of which is a% + b%, and obtaining the abscissa of the D point as D point according to the coordinates of A, B points and the ordinate of the D point
And finding out the point C with the same abscissa as the point D and the ordinate of the point C is a% + b%. Therefore, the coordinates of the point D and the point C are respectively:
wherein the value of T is related to n. For example, T at the first year0Every yearSmaller than the value of T in the last year, and the relation T ═ T can be adopted0[1-2.5％*(n-1)]The expression is not unique, and only the condition that T and n are in a negative correlation relationship is shown.
2) As shown in fig. 2, in the use process of the battery, at the same discharge current, the value of n increases (the abscissa goes from right to left) with the increase of the number of charging and discharging times (i.e., the increase of the accumulated charge capacity), and the decrease rate of the SOC in the corresponding discharge process also becomes faster and faster. Therefore, as the number of times the battery is used increases, the setting error b% needs to be smaller. This change is reflected by increasing b% in the abscissa of the point C by a factor x, for example, by making x k1-k2N, the ordinate of the changed C point is
k1、k2Is a set parameter, and k1And k2Are both greater than 0, where k1、k2The values may be 1.1 and 0.1, respectively.
3) Connecting A, C two points and C, B two points respectively to obtain a line segment AC and a line segment CB, wherein the two line segments are used for representing the display charge state corresponding to the line segment AB in the ideal state, and further calculating the ratio of the slope of the line segment AC to the slope of the line segment AB, namely the acceleration factor KpThe ratio of the slope of the line segment CB to the slope of the line segment AB is obtained, and the deceleration factor K is obtainedN. The calculation process is as follows: after coordinates of the three points A, B, C are obtained, the slopes of the line segment AB, the line segment AC and the line segment CB can be respectively obtained as follows:
further, an acceleration factor K is obtainedpAnd a deceleration factor KNRespectively is as follows:
the above processes are all directed to the discharging process, and the following is directed to how to calculate the current display state of charge SOC in the charging processDisplay deviceA detailed description will be given.
In the process of charging the battery, the formula of the traditional ampere-hour integral method is as follows:
in the formula i2Is a discharge current.
Increasing the temperature coefficient K of the battery during integration over timeTCoefficient of battery life KSOHCoefficient of uniformity with battery KYForming a formula of an improved ampere-hour integral method shown as a formula (16), and obtaining a calculated charge state in the charging process of the battery as follows:
the invention introduces an acceleration factor K on the basis of the formula (16)pAnd release factor KNObtaining the display state of charge SOCDisplay device. Compared with the mode of the formula (16), in the process of charging the battery, the acceleration factor K is adopted when the calculated state of charge is more than a certain SOC valuepMake SOCDisplay deviceSpecific SOCMeterSmall and with increasing depth of charge, SOCDisplay deviceOff SOCMeterTo a lesser and lesser extent; adopting a release factor K when the calculated state of charge is below a certain SOC valueNMake SOCDisplay deviceSpecific SOCMeterSmall but with increasing depth of charge, SOCDisplay deviceOff SOCMeterTo an increasingly greater extent, with the intention of balancing the early discharge process SOCMeterAnd SOCDisplay deviceThe resulting deviation. The process is described in detail below:
step 1, calculating to obtain the current calculation state of charge SOC according to the formula (16) when the battery is in a charging stateMeterAnd determining the SOCMeterAnd the sum of the set discharge minimum value a% and the set error value b% is as follows:
if SOCMeterMore than or equal to (a% + b%), according to the set discharge minimum value a%, acceleration factor KpAnd the current calculation state of charge SOCMeterDifference Δ SOC from a set minimum discharge a%3And calculating to obtain the current display state of charge (SOC)Display device：
SOCDisplay device＝a％+Kp*ΔSOC3 (17)
In the formula, the acceleration factor KpSee formula (5), Δ SOC3Comprises the following steps:
in the formula, Δ SOC3The corresponding charging time is t 5-t 6, and the value of the adjustment coefficient K is shown in an equation (6).
If SOCMeter< (a% + b%), then SOC is based on the initial state of charge0A deceleration factor KNAnd the current calculation state of charge SOCMeterAnd initial state of charge SOC0Difference value Δ SOC of4And calculating to obtain the current display state of charge (SOC)Display device：
SOCDisplay device＝SOC0+KN*ΔSOC4 (19)
In the formula, the deceleration factor KNIs shown in formula (9), Δ SOC4Comprises the following steps:
in the formula, Δ SOC4The corresponding charging time is t 7-t 8, and the value of the adjustment coefficient K is shown in an equation (6).
Step 2, calculating the current display state of charge SOC according to the formula (17) or the formula (19)Display deviceAnd displaying on the instrument panel.
With respect to the acceleration factor KpA deceleration factor KNThe values of the parameters such as the parameter n representing the attenuation degree of the battery are consistent with the discharging process, and are not described again here.
In this embodiment, for the adjustment coefficient K, the value is selected as the battery temperature coefficient KTCoefficient of battery life KSOHCoefficient of uniformity with battery KYAnd then the delta SOC is obtained according to the K value1、ΔSOC2、ΔSOC3And Δ SOC4. As another embodiment, the battery temperature coefficient K may be setTAnd coefficient of battery life KSOHThe product of (a) and (b).
In this embodiment, C is set according to the value of MTired ofthe/Q is divided into eight sections, and the corresponding n values are 1-8 respectively. As another embodiment, the number of the divided intervals can be properly adjusted, the number of the intervals can be increased or decreased, the corresponding n value can be changed, and C needs to be embodied no matter how the change is madeTired ofThe larger the/Q, the larger the value of n. For example, the interval can be divided into [0, M/3), [ M/3, 2M/3), [2M/3, M/, and the corresponding n values are 1, 3, and 5, respectively.
The embodiment of the device is as follows:
the embodiment provides a computing device for displaying a state of charge, the device includes a memory and a processor, the memory and the processor are electrically connected, the processor is used for executing instructions stored in the memory to implement a computing method for displaying a state of charge, the method is described in detail in the embodiment of the method, and details are not repeated here.
Claims (9)
1. A calculation method for displaying a state of charge is characterized by comprising the following steps:
1) when the battery is in a discharging state, judging that the battery is currently in a discharging stateCalculating the State of Charge SOCMeterWhether the sum of the set discharge minimum value a% and the set error value b% is larger than or equal to:
if the current state of charge SOC is calculatedMeterIf the sum is larger than or equal to the sum, the SOC is determined according to the initial state of charge0Acceleration factor KpAnd initial state of charge SOC0And the current calculation state of charge SOCMeterDifference value Δ SOC of1And calculating to obtain the current display state of charge (SOC)Display device：
SOCDisplay device＝SOC0-Kp*ΔSOC1
In the formula, the acceleration factor KpComprises the following steps:
in the formula, a% of the set minimum discharge value is determined by the vehicle discharge depth, b% of the set error value is determined by the maximum allowable error of the battery management system, and x is a set coefficient;
if the current state of charge SOC is calculatedMeterIf the sum is smaller than the sum, the discharge minimum value a% and the deceleration factor K are setNAnd setting a minimum discharge value a% and a current calculated state of charge (SOC)MeterDifference value Δ SOC of2And calculating to obtain the current display state of charge (SOC)Display device：
SOCDisplay device＝a％-KN*ΔSOC2
In the formula, the deceleration factor KNComprises the following steps:
2) according to the current display state of charge SOCDisplay deviceAnd displaying the state of charge of the battery.
2. The method of claim 1, wherein the determination is made when the battery is in a charging stateCurrent state of charge SOCMeterWhether the sum of the set discharge minimum value a% and the set error value b% is larger than:
if the current state of charge SOC is calculatedMeterIf the sum is larger than or equal to the sum, the discharge minimum value a% and the acceleration factor K are setpAnd the current calculation state of charge SOCMeterDifference Δ SOC from a set minimum discharge a%3And calculating to obtain the current display state of charge (SOC)Display device：
SOCDisplay device＝a％+Kp*ΔSOC3
If the current state of charge SOC is calculatedMeterIf the sum is less than the above value, the SOC is determined according to the initial state of charge0A deceleration factor KNAnd the current calculation state of charge SOCMeterAnd initial state of charge SOC0Difference value Δ SOC of4And calculating to obtain the current display state of charge (SOC)Display device：
SOCDisplay device＝SOC0+KN*ΔSOC4。
3. The method of claim 1, wherein the initial state of charge SOC is0And the current calculation state of charge SOCMeterDifference value Δ SOC of1The set minimum discharge value a% and the current calculated state of charge SOCMeterDifference value Δ SOC of2Respectively as follows:
in the formula, Q is the initial rated capacity; i.e. i1Is a discharge current; k is an adjustment coefficient which is the product of a battery temperature coefficient, a battery life coefficient and a battery consistency coefficient, or the product of the battery temperature coefficient and the battery life coefficient; delta SOC1The corresponding discharge time is t 1-t 2; delta SOC2The corresponding discharge time is t 3-t 4.
4. The method of claim 2, wherein the current state of charge SOC is calculated according to the current SOCMeterDifference Δ SOC from a set minimum discharge a%3The current calculation state of charge SOCMeterAnd initial state of charge SOC0Difference value Δ SOC of4Respectively as follows:
in the formula, Q is the initial rated capacity; i.e. i2Is a charging current; k is an adjustment coefficient which is the product of a battery temperature coefficient, a battery life coefficient and a battery consistency coefficient, or the product of the battery temperature coefficient and the battery life coefficient; delta SOC3The corresponding charging time is t 5-t 6; delta SOC4The corresponding charging time is t 7-t 8.
5. The method according to claim 1 or 2, wherein the set coefficient x is: x is k1-k2N, wherein k1、k2For the set parameter, n is a parameter representing the degree of cell attenuation, and k1And k2Are all greater than 0.
6. The method according to claim 5, wherein the parameter n representing the degree of battery degradation is determined according to the ratio of the accumulated charge capacity to the initial rated capacity during the charging and discharging process of the battery, and each ratio corresponds to the parameter n representing the degree of battery degradation.
7. The method according to claim 6, wherein the ratio is divided into different intervals according to the number of cycles when the capacity of the battery decays to a set multiple of the initial rated capacity, wherein one interval corresponds to a parameter n representing the degree of decay of the battery; and determining a parameter representing the attenuation degree of the battery according to the interval to which the ratio belongs.
8. The method of claim 5, wherein k is k1＝1.1，k2＝0.1。
9. A state-of-charge displaying computing device comprising a memory and a processor, wherein the processor is configured to execute instructions stored in the memory to implement the method according to any one of claims 1 to 8.
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| CN202010238256.1A CN113533964B (en) | 2020-03-30 | 2020-03-30 | Calculation method and device for displaying state of charge |
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