CN121454332A - A method and system for estimating SOCE of electric vehicles - Google Patents
A method and system for estimating SOCE of electric vehiclesInfo
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Abstract
The application discloses an estimation method and system of an electric automobile SOCE, and relates to the technical field of vehicle batteries, wherein the method comprises the steps of calculating corresponding charging energy if a charging start SOC corresponding to a previous charging time of a target battery pack is smaller than a first preset percentage and a charging end SOC corresponding to the previous charging time is not smaller than a second preset percentage; the method comprises the steps of calculating discharge energy and recovery energy corresponding to the charge energy corresponding to the previous charge time, calculating real discharge energy and full Cheng Zhenshi discharge energy when the charge start SOC corresponding to the next charge time is smaller than a third preset percentage and the interval time between the two charge times is smaller than a first preset interval day threshold, and calculating SOCE of obtaining the target battery pack based on the full Cheng Zhenshi discharge energy and the nominal rated discharge energy of the target battery pack. The application can more accurately estimate the attenuation state of the battery, can easily acquire the attenuation state of the battery of the vehicle, and is convenient for maintenance of the battery.
Description
Technical Field
The application relates to the technical field of vehicle batteries, in particular to an estimation method and system of an electric automobile SOCE.
Background
The battery attenuation state of the electric vehicle is evaluated by SOH, SOH is capacity attenuation, the attenuation state of the energy of the power battery cannot be truly reflected, SOCE is the battery energy state and directly reflects the energy attenuation state of the battery, and the BMS of the electric vehicle on the market at present has not been subjected to SOCE estimation function development.
In order to meet the actual requirements, an estimation technique of the electric automobile SOCE is now proposed.
Disclosure of Invention
Aiming at the defects in the prior art, the application aims to provide the estimation method and the system for the electric automobile SOCE, which can more accurately estimate the attenuation state of the battery through a specific data processing flow and a data calculation flow, can easily acquire the attenuation state of the battery of the vehicle, and is convenient for maintenance and service of the battery.
In order to achieve the above purpose, the application adopts the following technical scheme:
in a first aspect, the present application provides a method for estimating an electric vehicle SOCE, the method including the steps of:
S1, acquiring battery pack voltage, battery pack current and current charge and discharge energy efficiency of a target battery pack in real time;
S2, if the charge start SOC corresponding to the previous charge time is smaller than the first preset percentage and the charge end SOC corresponding to the previous charge time is not smaller than the second preset percentage, calculating to obtain the charge energy corresponding to the previous charge time;
S3, calculating discharge energy corresponding to the charging energy corresponding to the previous charging time and recovering energy;
S4, when the charging start SOC corresponding to the next charging time is smaller than a third preset percentage and the interval time between the front charging time and the rear charging time is smaller than a first preset interval number of days threshold, executing the step S5;
S5, calculating to obtain corresponding real discharge energy based on discharge energy corresponding to the charge energy corresponding to the previous charge time, recovered energy and corresponding current charge-discharge energy efficiency, and further calculating to obtain corresponding full Cheng Zhenshi discharge energy by combining a charge ending SOC corresponding to the previous charge time and a charge starting SOC corresponding to the latter charge time;
And S6, calculating SOCE of the target battery pack based on the full Cheng Zhenshi discharge energy and the nominal rated discharge energy of the target battery pack.
On the basis of the technical scheme, the method further comprises the following steps:
and dynamically updating the current charge and discharge energy efficiency based on the charge start SOC corresponding to the previous charge time, the charge end SOC corresponding to the previous charge time, the charge start SOC corresponding to the next charge time, the charge energy corresponding to the previous charge time and the real discharge energy corresponding to the previous charge time.
On the basis of the technical scheme, the method further comprises the following steps:
When the difference in value between SOCE obtained by the last calculation and SOCE obtained by the previous calculation is greater than a preset difference percentage, the value of SOCE obtained by the last calculation is displayed.
On the basis of the technical scheme, the first preset percentage is 30%;
The second preset percentage is 95%;
the third preset percentage is 30%.
On the basis of the technical scheme, the method is configured with a real discharge energy calculation formula, wherein the real discharge energy calculation formula is as follows:
wherein, the method comprises the steps of,
For the actual discharge energy corresponding to the previous charging instant,For the discharge energy corresponding to the charge energy corresponding to the previous charge time,For the current charge-discharge energy efficiency corresponding to the charge energy corresponding to the previous charge time,And recovering energy corresponding to the charging energy corresponding to the previous charging time.
On the basis of the technical scheme, the method is configured with a full Cheng Zhenshi discharge energy calculation formula, and the full Cheng Zhenshi discharge energy calculation formula is as follows:
wherein, the method comprises the steps of,
The energy is discharged for the whole Cheng Zhenshi corresponding to the previous charging moment,For the actual discharge energy corresponding to the previous charging instant,For the charge end SOC corresponding to the previous charge time,For the charge start SOC corresponding to the latter charge time,The value range is [0.698,0.702] which is a unit-free adjustment coefficient constrained by the temperature of the battery.
On the basis of the technical scheme, the method is configured with SOCE calculation formulas, and the SOCE calculation formulas are as follows:
wherein, the method comprises the steps of,
The energy is discharged for the whole Cheng Zhenshi corresponding to the previous charging moment,Is the nominal rated discharge energy of the target battery pack.
On the basis of the technical scheme, the method is configured with a current charge-discharge energy efficiency calculation formula, wherein the current charge-discharge energy efficiency calculation formula is as follows:
wherein, the method comprises the steps of,
For the current charge-discharge energy efficiency,For the charge start SOC corresponding to the previous charge time,For the charge end SOC corresponding to the previous charge time,For the charge start SOC corresponding to the latter charge time,For the charging energy corresponding to the previous charging instant,The real discharge energy corresponding to the previous charging time is obtained.
In a second aspect, the present application provides an estimation system for an electric vehicle SOCE, the system comprising:
the real-time monitoring module is used for acquiring and obtaining the battery pack voltage, the battery pack current and the current charge and discharge energy efficiency of the target battery pack in real time;
The first calculation module is used for calculating and obtaining the charging energy corresponding to the previous charging moment if the charging start SOC corresponding to the previous charging moment is smaller than a first preset percentage and the charging end SOC corresponding to the previous charging moment is not smaller than a second preset percentage;
a second calculation module for calculating discharge energy and recovered energy corresponding to the charge energy corresponding to a previous charge time;
the third calculation module is used for notifying the fourth calculation module to work when the charging start SOC corresponding to the next charging time is smaller than a third preset percentage and the interval time between the front charging time and the rear charging time is smaller than a first preset interval day threshold;
A fourth calculation module, configured to calculate and obtain a corresponding real discharge energy based on the discharge energy corresponding to the charge energy corresponding to the previous charge time, the recovered energy, and the corresponding current charge-discharge energy efficiency, and further calculate and obtain a corresponding full Cheng Zhenshi discharge energy by combining a charge end SOC corresponding to the previous charge time and a charge start SOC corresponding to the next charge time;
SOCE a calculating module, configured to calculate SOCE of the target battery pack based on the full Cheng Zhenshi discharge energy and the nominal rated discharge energy of the target battery pack.
On the basis of the technical scheme, the system further comprises:
The dynamic updating module is used for dynamically updating the current charge and discharge energy efficiency based on the charge start SOC corresponding to the previous charge time, the charge end SOC corresponding to the previous charge time, the charge start SOC corresponding to the next charge time, the charge energy corresponding to the previous charge time and the real discharge energy corresponding to the previous charge time.
On the basis of the technical scheme, the system further comprises:
SOCE a display module, configured to display the value of SOCE obtained by the last calculation when the difference between the value of SOCE obtained by the last calculation and the value of SOCE obtained by the previous calculation is greater than a preset difference percentage.
On the basis of the technical scheme, the first preset percentage is 30%;
The second preset percentage is 95%;
the third preset percentage is 30%.
On the basis of the technical scheme, the system is configured with a real discharge energy calculation formula, wherein the real discharge energy calculation formula is as follows:
wherein, the method comprises the steps of,
For the actual discharge energy corresponding to the previous charging instant,For the discharge energy corresponding to the charge energy corresponding to the previous charge time,For the current charge-discharge energy efficiency corresponding to the charge energy corresponding to the previous charge time,And recovering energy corresponding to the charging energy corresponding to the previous charging time.
On the basis of the technical scheme, the system is configured with a full Cheng Zhenshi discharge energy calculation formula, and the full Cheng Zhenshi discharge energy calculation formula is as follows:
wherein, the method comprises the steps of,
The energy is discharged for the whole Cheng Zhenshi corresponding to the previous charging moment,For the actual discharge energy corresponding to the previous charging instant,For the charge end SOC corresponding to the previous charge time,For the charge start SOC corresponding to the latter charge time,The value range is [0.698,0.702] which is a unit-free adjustment coefficient constrained by the temperature of the battery.
On the basis of the technical scheme, the system is configured with SOCE calculation formulas, and the SOCE calculation formulas are as follows:
wherein, the method comprises the steps of,
The energy is discharged for the whole Cheng Zhenshi corresponding to the previous charging moment,Is the nominal rated discharge energy of the target battery pack.
On the basis of the technical scheme, the system is configured with a current charge-discharge energy efficiency calculation formula, and the current charge-discharge energy efficiency calculation formula is as follows:
wherein, the method comprises the steps of,
For the current charge-discharge energy efficiency,For the charge start SOC corresponding to the previous charge time,For the charge end SOC corresponding to the previous charge time,For the charge start SOC corresponding to the latter charge time,For the charging energy corresponding to the previous charging instant,The real discharge energy corresponding to the previous charging time is obtained.
Compared with the prior art, the application has the advantages that:
According to the application, through a specific data processing flow and a data calculation flow, the attenuation state of the battery can be estimated more accurately, the attenuation state of the battery of the vehicle can be obtained more easily, and the battery is convenient to maintain and maintain.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart illustrating steps of an estimation method of an electric vehicle SOCE according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Embodiments of the present application are described in further detail below with reference to the accompanying drawings.
The embodiment of the application provides an estimation method and an estimation system for an electric automobile SOCE, which can more accurately estimate the attenuation state of a battery through a specific data processing flow and a data calculation flow, can easily acquire the attenuation state of the battery of the vehicle, and is convenient for maintenance and service of the battery.
In order to achieve the technical effects, the general idea of the application is as follows:
An estimation method of an electric vehicle SOCE, the method comprising the steps of:
S1, acquiring battery pack voltage, battery pack current and current charge and discharge energy efficiency of a target battery pack in real time;
S2, if the charge start SOC corresponding to the previous charge time is smaller than the first preset percentage and the charge end SOC corresponding to the previous charge time is not smaller than the second preset percentage, calculating to obtain the charge energy corresponding to the previous charge time;
s3, calculating discharge energy corresponding to the charging energy corresponding to the previous charging time and recovering energy;
S4, when the charging start SOC corresponding to the next charging time is smaller than a third preset percentage and the interval time between the front charging time and the rear charging time is smaller than a first preset interval number of days threshold, executing the step S5;
S5, calculating to obtain corresponding real discharge energy based on discharge energy corresponding to the charge energy corresponding to the previous charge time, recovered energy and corresponding current charge and discharge energy efficiency, and further calculating to obtain corresponding full Cheng Zhenshi discharge energy by combining the charge ending SOC corresponding to the previous charge time and the charge starting SOC corresponding to the latter charge time;
And S6, calculating SOCE of the target battery pack based on the full Cheng Zhenshi discharge energy and the nominal rated discharge energy of the target battery pack.
Embodiments of the present application are described in further detail below with reference to the accompanying drawings.
In a first aspect, referring to fig. 1, an embodiment of the present application provides a method for estimating an electric vehicle SOCE, including the following steps:
S1, acquiring battery pack voltage, battery pack current and current charge and discharge energy efficiency of a target battery pack in real time;
S2, if the charge start SOC corresponding to the previous charge time is smaller than the first preset percentage and the charge end SOC corresponding to the previous charge time is not smaller than the second preset percentage, calculating to obtain the charge energy corresponding to the previous charge time;
s3, calculating discharge energy corresponding to the charging energy corresponding to the previous charging time and recovering energy;
S4, when the charging start SOC corresponding to the next charging time is smaller than a third preset percentage and the interval time between the front charging time and the rear charging time is smaller than a first preset interval number of days threshold, executing the step S5;
S5, calculating to obtain corresponding real discharge energy based on discharge energy corresponding to the charge energy corresponding to the previous charge time, recovered energy and corresponding current charge and discharge energy efficiency, and further calculating to obtain corresponding full Cheng Zhenshi discharge energy by combining the charge ending SOC corresponding to the previous charge time and the charge starting SOC corresponding to the latter charge time;
And S6, calculating SOCE of the target battery pack based on the full Cheng Zhenshi discharge energy and the nominal rated discharge energy of the target battery pack.
It should be noted that, the SOCE concept is that the battery authentication energy State, SOCE (State Of CERTIFIED ENERGY), simply understood that the battery pack has a certain attenuation along with the use Of the battery pack, SOCE is that the maximum available energy Of the battery pack in the current State divided by the rated energy Of the factory authentication is a percentage, and SOCE can more intuitively reflect the attenuation State Of the battery pack.
According to the embodiment of the application, the attenuation state of the battery can be estimated more accurately through the specific data processing flow and the data calculation flow, the attenuation state of the battery of the vehicle can be obtained more easily, and the battery is convenient to maintain and maintain.
Further, the method comprises the following steps:
and dynamically updating the current charge and discharge energy efficiency based on the charge start SOC corresponding to the previous charge time, the charge end SOC corresponding to the previous charge time, the charge start SOC corresponding to the next charge time, the charge energy corresponding to the previous charge time and the real discharge energy corresponding to the previous charge time.
Further, the method comprises the following steps:
When the difference in value between SOCE obtained by the last calculation and SOCE obtained by the previous calculation is greater than a preset difference percentage, the value of SOCE obtained by the last calculation is displayed.
Further, the first preset percentage is 30%;
The second preset percentage is 95%;
the third preset percentage is 30%.
Further, the method is configured with a real discharge energy calculation formula, wherein the real discharge energy calculation formula is as follows:
wherein, the method comprises the steps of,
For the actual discharge energy corresponding to the previous charging instant,For the discharge energy corresponding to the charge energy corresponding to the previous charge time,For the current charge-discharge energy efficiency corresponding to the charge energy corresponding to the previous charge time,And recovering energy corresponding to the charging energy corresponding to the previous charging time.
Further, the method is configured with a full Cheng Zhenshi discharge energy calculation formula, and the full Cheng Zhenshi discharge energy calculation formula is as follows:
wherein, the method comprises the steps of,
The energy is discharged for the whole Cheng Zhenshi corresponding to the previous charging moment,For the actual discharge energy corresponding to the previous charging instant,For the charge end SOC corresponding to the previous charge time,For the charge start SOC corresponding to the latter charge time,The value range is [0.698,0.702] which is a unit-free adjustment coefficient constrained by the temperature of the battery.
Further, the method is configured with SOCE calculation formulas, and the SOCE calculation formulas are:
wherein, the method comprises the steps of,
The energy is discharged for the whole Cheng Zhenshi corresponding to the previous charging moment,Is the nominal rated discharge energy of the target battery pack.
Further, the method is configured with a current charge-discharge energy efficiency calculation formula, wherein the current charge-discharge energy efficiency calculation formula is as follows:
wherein, the method comprises the steps of,
For the current charge-discharge energy efficiency,For the charge start SOC corresponding to the previous charge time,For the charge end SOC corresponding to the previous charge time,For the charge start SOC corresponding to the latter charge time,For the charging energy corresponding to the previous charging instant,The real discharge energy corresponding to the previous charging time is obtained.
Based on the technical scheme of the embodiment of the application, when in specific implementation, the following conditions are adopted:
first, the initial charge-discharge energy efficiency of the battery pack is recorded as The nominal rated discharge energy of the battery is. The method is realized by the following steps:
Step 1, BMS acquires total voltage V of a battery pack and current of the battery pack in real time The current charge-discharge energy efficiency of the battery pack is recorded as。
Step 2, when the vehicle is in use, charging is performed, and the accumulated charging energy is calculated as long as the vehicle is chargedIf the starting time of the current charge<30%, At the same time, calculate the charge energy after the end of this chargeIf the charging is finishedMore than or equal to 95 percent, the calculation is judgedEffectively, jumping to the execution of the step 3, otherwise continuing to jump to the execution of the step 1 until judging thatIs effective.
Step3, calculating the energy from the last timeEnergy of discharge after being effectiveWhen the current isFor positive, the discharge energy is calculated, and the recovery energy in the discharge process is calculatedWhen the current isAt negative values, the recovered energy is calculated.
Step 4, if the next charging time is<30%, And the next charging time is less than 10 days、And if the result is judged to be valid, jumping to the step 5, otherwise jumping to the step 1 and re-executing.
Step 5, calculating effective real discharge energy in the discharge process, and removing recovered energyThe influence of (2) is recorded asCalculated by the following formula:
。
Due to the above Discharge energy not in the whole discharge interval is required to beExtend, map to the discharge energy of the whole process corresponding to 0-100% SOC, record asCalculated by the following formula:
;
wherein epsilon is a unitless adjustment coefficient, and is constrained by the battery temperature, and the value epsilon [0.698,0.702].
And step 6, calculating the remaining energy state of the battery pack, wherein the remaining energy state is calculated by the following formula:
;
Wherein SOCE has a resolution of 0.1%.
Step 7, self-learning the charge-discharge energy efficiency of the vehicle batteryWhen (when)≤At the time, the updated charge-discharge energy efficiency is usedThe representation is calculated by the following formula:
;
the η in step 1 is replaced by the calculated η1.
Step 8, updating SOCE on the instrument when SOCE calculated in step 6 is more than or equal to 0.1% of the previous SOCE change;
The display on the whole vehicle is divided into two parts:
The first part is a main driving screen, SOCE and the total pure electric mileage are displayed, and the total pure electric mileage is obtained through other controllers of the vehicle;
The second part is a central control screen battery information display area for displaying basic battery information such as SOC and SOH, and also for displaying SOCE, eta and accumulated charging energy And the like, the display information BMS is communicated with the IVI through a CAN bus, and the transmission period is 1s;
simultaneously SOCE is transmitted to a cloud platform through the vehicle-mounted T-BOX, and SOCE information can be acquired through the cloud platform;
meanwhile, the vehicle side can read the current SOCE value through the OBD diagnosis port.
Step 9, circularly executing according to the step 1;
Above-mentioned ,,Obtained by integrating voltage and current, i.e. +.Vdt。
In a second aspect, an embodiment of the present application provides an estimation system for an electric vehicle SOCE, the system including:
the real-time monitoring module is used for acquiring and obtaining the battery pack voltage, the battery pack current and the current charge and discharge energy efficiency of the target battery pack in real time;
The first calculation module is used for calculating and obtaining the charging energy corresponding to the previous charging moment if the charging start SOC corresponding to the previous charging moment is smaller than a first preset percentage and the charging end SOC corresponding to the previous charging moment is not smaller than a second preset percentage;
a second calculation module for calculating discharge energy and recovered energy corresponding to the charge energy corresponding to a previous charge time;
the third calculation module is used for notifying the fourth calculation module to work when the charging start SOC corresponding to the next charging time is smaller than a third preset percentage and the interval time between the front charging time and the rear charging time is smaller than a first preset interval day threshold;
A fourth calculation module, configured to calculate and obtain a corresponding real discharge energy based on the discharge energy corresponding to the charge energy corresponding to the previous charge time, the recovered energy, and the corresponding current charge-discharge energy efficiency, and further calculate and obtain a corresponding full Cheng Zhenshi discharge energy by combining a charge end SOC corresponding to the previous charge time and a charge start SOC corresponding to the next charge time;
SOCE a calculating module, configured to calculate SOCE of the target battery pack based on the full Cheng Zhenshi discharge energy and the nominal rated discharge energy of the target battery pack.
According to the embodiment of the application, the attenuation state of the battery can be estimated more accurately through the specific data processing flow and the data calculation flow, the attenuation state of the battery of the vehicle can be obtained more easily, and the battery is convenient to maintain and maintain.
Further, the system further comprises:
The dynamic updating module is used for dynamically updating the current charge and discharge energy efficiency based on the charge start SOC corresponding to the previous charge time, the charge end SOC corresponding to the previous charge time, the charge start SOC corresponding to the next charge time, the charge energy corresponding to the previous charge time and the real discharge energy corresponding to the previous charge time.
Further, the system further comprises:
SOCE a display module, configured to display the value of SOCE obtained by the last calculation when the difference between the value of SOCE obtained by the last calculation and the value of SOCE obtained by the previous calculation is greater than a preset difference percentage.
Further, the first preset percentage is 30%;
The second preset percentage is 95%;
the third preset percentage is 30%.
Further, the system is configured with a real discharge energy calculation formula, wherein the real discharge energy calculation formula is as follows:
wherein, the method comprises the steps of,
For the actual discharge energy corresponding to the previous charging instant,For the discharge energy corresponding to the charge energy corresponding to the previous charge time,For the current charge-discharge energy efficiency corresponding to the charge energy corresponding to the previous charge time,And recovering energy corresponding to the charging energy corresponding to the previous charging time.
Further, the system is configured with a complete Cheng Zhenshi discharge energy calculation formula, and the complete Cheng Zhenshi discharge energy calculation formula is:
wherein, the method comprises the steps of,
The energy is discharged for the whole Cheng Zhenshi corresponding to the previous charging moment,For the actual discharge energy corresponding to the previous charging instant,For the charge end SOC corresponding to the previous charge time,For the charge start SOC corresponding to the latter charge time,The value range is [0.698,0.702] which is a unit-free adjustment coefficient constrained by the temperature of the battery.
Further, the system is configured with SOCE calculation formulas, and the SOCE calculation formulas are:
wherein, the method comprises the steps of,
The energy is discharged for the whole Cheng Zhenshi corresponding to the previous charging moment,Is the nominal rated discharge energy of the target battery pack.
Further, the system is configured with a current charge-discharge energy efficiency calculation formula, and the current charge-discharge energy efficiency calculation formula is:
wherein, the method comprises the steps of,
For the current charge-discharge energy efficiency,For the charge start SOC corresponding to the previous charge time,For the charge end SOC corresponding to the previous charge time,For the charge start SOC corresponding to the latter charge time,For the charging energy corresponding to the previous charging instant,The real discharge energy corresponding to the previous charging time is obtained.
In summary, the estimation system of the electric vehicle SOCE according to the embodiment of the present application is the same as the estimation method of the electric vehicle SOCE according to the first aspect in terms of technical problems, technical solutions, and technical effects, so that the description thereof will be omitted.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the system or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, or indirectly connected via an intervening medium, or may be in communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An estimation method of an electric automobile SOCE, comprising the steps of:
S1, acquiring battery pack voltage, battery pack current and current charge and discharge energy efficiency of a target battery pack in real time;
S2, if the charge start SOC corresponding to the previous charge time is smaller than the first preset percentage and the charge end SOC corresponding to the previous charge time is not smaller than the second preset percentage, calculating to obtain the charge energy corresponding to the previous charge time;
S3, calculating discharge energy corresponding to the charging energy corresponding to the previous charging time and recovering energy;
S4, when the charging start SOC corresponding to the next charging time is smaller than a third preset percentage and the interval time between the front charging time and the rear charging time is smaller than a first preset interval number of days threshold, executing the step S5;
S5, calculating to obtain corresponding real discharge energy based on discharge energy corresponding to the charge energy corresponding to the previous charge time, recovered energy and corresponding current charge-discharge energy efficiency, and further calculating to obtain corresponding full Cheng Zhenshi discharge energy by combining a charge ending SOC corresponding to the previous charge time and a charge starting SOC corresponding to the latter charge time;
And S6, calculating SOCE of the target battery pack based on the full Cheng Zhenshi discharge energy and the nominal rated discharge energy of the target battery pack.
2. The method of estimating an electric vehicle SOCE according to claim 1, further comprising the steps of:
and dynamically updating the current charge and discharge energy efficiency based on the charge start SOC corresponding to the previous charge time, the charge end SOC corresponding to the previous charge time, the charge start SOC corresponding to the next charge time, the charge energy corresponding to the previous charge time and the real discharge energy corresponding to the previous charge time.
3. The method of estimating an electric vehicle SOCE according to claim 1, further comprising the steps of:
When the difference in value between SOCE obtained by the last calculation and SOCE obtained by the previous calculation is greater than a preset difference percentage, the value of SOCE obtained by the last calculation is displayed.
4. The method for estimating an electric vehicle SOCE according to claim 1, wherein:
The first preset percentage is 30%;
The second preset percentage is 95%;
the third preset percentage is 30%.
5. The estimation method of an electric vehicle SOCE according to claim 1, wherein the method is configured with a true discharge energy calculation formula, the true discharge energy calculation formula is:
wherein, the method comprises the steps of,
For the actual discharge energy corresponding to the previous charging instant,For the discharge energy corresponding to the charge energy corresponding to the previous charge time,For the current charge-discharge energy efficiency corresponding to the charge energy corresponding to the previous charge time,And recovering energy corresponding to the charging energy corresponding to the previous charging time.
6. The method of estimating an electric vehicle SOCE according to claim 5, wherein the method is configured with a full Cheng Zhenshi discharge energy calculation formula, and the full Cheng Zhenshi discharge energy calculation formula is:
wherein, the method comprises the steps of,
The energy is discharged for the whole Cheng Zhenshi corresponding to the previous charging moment,For the actual discharge energy corresponding to the previous charging instant,For the charge end SOC corresponding to the previous charge time,For the charge start SOC corresponding to the latter charge time,The value range is [0.698,0.702] which is a unit-free adjustment coefficient constrained by the temperature of the battery.
7. The method of estimating an electric vehicle SOCE according to claim 6, wherein the method is configured with a SOCE calculation formula, and the SOCE calculation formula is:
wherein, the method comprises the steps of,
The energy is discharged for the whole Cheng Zhenshi corresponding to the previous charging moment,Is the nominal rated discharge energy of the target battery pack.
8. The method of estimating an electric vehicle SOCE according to claim 6, wherein the method is configured with a current charge-discharge energy efficiency calculation formula, the current charge-discharge energy efficiency calculation formula being:
wherein, the method comprises the steps of,
For the current charge-discharge energy efficiency,For the charge start SOC corresponding to the previous charge time,For the charge end SOC corresponding to the previous charge time,For the charge start SOC corresponding to the latter charge time,For the charging energy corresponding to the previous charging instant,The real discharge energy corresponding to the previous charging time is obtained.
9. An estimation system for an electric vehicle SOCE, the system comprising:
the real-time monitoring module is used for acquiring and obtaining the battery pack voltage, the battery pack current and the current charge and discharge energy efficiency of the target battery pack in real time;
The first calculation module is used for calculating and obtaining the charging energy corresponding to the previous charging moment if the charging start SOC corresponding to the previous charging moment is smaller than a first preset percentage and the charging end SOC corresponding to the previous charging moment is not smaller than a second preset percentage;
a second calculation module for calculating discharge energy and recovered energy corresponding to the charge energy corresponding to a previous charge time;
the third calculation module is used for notifying the fourth calculation module to work when the charging start SOC corresponding to the next charging time is smaller than a third preset percentage and the interval time between the front charging time and the rear charging time is smaller than a first preset interval day threshold;
A fourth calculation module, configured to calculate and obtain a corresponding real discharge energy based on the discharge energy corresponding to the charge energy corresponding to the previous charge time, the recovered energy, and the corresponding current charge-discharge energy efficiency, and further calculate and obtain a corresponding full Cheng Zhenshi discharge energy by combining a charge end SOC corresponding to the previous charge time and a charge start SOC corresponding to the next charge time;
SOCE a calculating module, configured to calculate SOCE of the target battery pack based on the full Cheng Zhenshi discharge energy and the nominal rated discharge energy of the target battery pack.
10. The estimation system of electric vehicle SOCE according to claim 9, wherein the system further includes:
The dynamic updating module is used for dynamically updating the current charge and discharge energy efficiency based on the charge start SOC corresponding to the previous charge time, the charge end SOC corresponding to the previous charge time, the charge start SOC corresponding to the next charge time, the charge energy corresponding to the previous charge time and the real discharge energy corresponding to the previous charge time.
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