CN118033517A - Electric vehicle high-end electric quantity SOC calibration method for charging process - Google Patents
Electric vehicle high-end electric quantity SOC calibration method for charging process Download PDFInfo
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- CN118033517A CN118033517A CN202410274287.0A CN202410274287A CN118033517A CN 118033517 A CN118033517 A CN 118033517A CN 202410274287 A CN202410274287 A CN 202410274287A CN 118033517 A CN118033517 A CN 118033517A
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- soc
- mapping table
- charging process
- voltage
- calibrating
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000012937 correction Methods 0.000 claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 238000013507 mapping Methods 0.000 claims description 32
- 239000000178 monomer Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000007812 deficiency Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a calibration method for high-end electric quantity SOC of an electric vehicle in a charging process, which is used for calibrating corresponding tables of highest voltage of a single body, total voltage of a battery pack, lowest voltage of the single body and SOC respectively in a preset high-end electric quantity range in advance; in the actual charging process, monitoring the highest voltage of the single body, the total voltage of the battery pack and the lowest voltage of the single body in real time, calling and inquiring a corresponding relation table based on the monitoring result to obtain a corresponding target SOC value, and then selecting the smallest target SOC value to dynamically correct the current SOC and outputting and displaying the corrected SOC. According to the invention, in the charging process of the charging pile, when the vehicle SOC is charged to a high-end area, such as a 95% -98% interval, and before the charging current is stopped, the new energy vehicle is actively and dynamically corrected in advance, the problem of deficiency and high correction value is avoided, and the SOC error caused by the acquisition error is effectively eliminated.
Description
Technical Field
The invention relates to the field of new energy automobiles, in particular to a high-end electric quantity SOC calibration method for an electric vehicle in a charging process.
Background
Because the lithium iron phosphate battery has great calibration difficulty in the interval of 95-98% and insufficient precision, the SOC of a general new energy vehicle is required to be calibrated in full power when 100%. In the hot summer environment, when the existing charging pile displays that the vehicle SOC is within the range of 95-98%, the charging current is automatically cut off (because the higher the battery SOC is, the larger the energy contained is, the probability of thermal runaway is increased), so that the battery cannot be calibrated at a high-end SOC, and further the SOC precision is poor, and the estimated precision of the SOC is enabled to be > +/-4% through actual measurement.
As described above, since the policy of the large log-vehicle enterprise at the end of charging the new energy vehicle is that the SOC is not modified at the high end of charging, for example, in the SOC 95-98% interval, but the user is informed of the condition of not being full by sending a short message or the like, the user is reminded of the self-filling.
Disclosure of Invention
In view of the foregoing, the present invention is directed to providing a method for calibrating a high-end power SOC of an electric vehicle during a charging process, so as to solve the aforementioned technical problems.
The technical scheme adopted by the invention is as follows:
the invention provides a method for calibrating the SOC of the high-end electric quantity of an electric vehicle in a charging process, which comprises the following steps:
calibrating the corresponding relation between the highest voltage of a single body and the SOC in a preset high-end electric quantity range in advance to obtain a first mapping table;
calibrating the corresponding relation between the total voltage of the battery pack and the SOC in a preset high-end electric quantity range in advance to obtain a second mapping table;
Calibrating the corresponding relation between the lowest voltage of the monomer and the SOC in a preset high-end electric quantity range in advance to obtain a third mapping table;
In the actual charging process, monitoring the highest voltage of the single body, the total voltage of the battery pack and the lowest voltage of the single body in real time, and calling and inquiring the corresponding first mapping table, second mapping table and third mapping table based on the monitoring result;
After corresponding SOC values are respectively obtained according to the first mapping table, the second mapping table and the third mapping table, the smallest SOC value is selected as a correction value to dynamically correct the current SOC;
And outputting the corrected SOC to display.
In at least one possible implementation, the preset high-end power range includes any range value combination from 92% to 98%.
In at least one possible implementation manner, the calibration method further comprises: in the correction process, the SOC correction times and the mapping table correspondingly adopted are recorded.
In at least one possible implementation manner, the pre-calibration manner includes: before leaving the factory, the vehicle is calibrated through the charging and discharging cabinet and stored in a battery management system of the vehicle.
In at least one possible implementation manner, the calibration method further comprises: and synchronizing the corrected SOC to the charging pile in real time.
In at least one possible implementation manner, the total battery pack voltage=the average cell voltage in the battery pack×the number of cells connected in series in the battery pack.
Compared with the prior art, the main design concept of the invention is that in the preset high-end electric quantity range, the corresponding table of the highest voltage and the SOC of the single body, the corresponding table of the total voltage and the SOC of the battery pack and the corresponding table of the lowest voltage and the SOC of the single body are calibrated, in the actual charging process, the highest voltage of the single body, the total voltage of the battery pack and the lowest voltage of the single body are monitored in real time, the corresponding relation table is called and inquired based on the monitoring result, the corresponding target SOC value is obtained, and then the minimum target SOC value is selected to dynamically correct the current SOC and output and display the corrected SOC. According to the invention, in the charging process of the charging pile, when the vehicle SOC is charged to a high-end area, such as a 95% -98% interval, and before the charging current is stopped, the new energy vehicle is actively and dynamically corrected in advance, the problem of deficiency and high correction value is avoided, and the SOC error caused by the acquisition error is effectively eliminated.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:
Fig. 1 is a flow chart of a method for calibrating an SOC of a high-end electric power of an electric vehicle according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The invention provides an embodiment of an electric vehicle high-end electric quantity SOC calibration method for a charging process, specifically, as shown in FIG. 1, the method comprises the following steps:
Step S1, calibrating the corresponding relation between the highest voltage of a single body and the SOC in a preset high-end electric quantity range in advance to obtain a first mapping table and storing the first mapping table in a battery management system;
Specifically, the preset high-end electric quantity range includes any range value combination of 92% -98%, such as 95% -98%, such as 92% -95%, such as 94% -97%, and the like, and the range may depend on the actual definition of the charging pile for the high-end electric quantity charging threshold, so that no limitation or redundant description is made. In the following, SOC corresponding to Vmax (highest voltage in the battery pack) is calibrated in advance, for example, to vmax=3.465V, and soc=95.0%; vmax=3.47V, corresponding to soc=96.0%; vmax= 3.496V, corresponding soc=97.0%; vmax= 3.620V, corresponding soc=98.0%. In actual operation, the parameter value can be calibrated in advance by the charge-discharge cabinet before the vehicle leaves the factory and stored in the BMS (battery management system) of the vehicle so as to be called when required.
S2, calibrating the corresponding relation between the total voltage of the battery pack and the SOC in a preset high-end electric quantity range in advance, obtaining a second mapping table and storing the second mapping table in a battery management system;
Specifically, SOC corresponding to vbal (average cell voltage of battery pack×number of series cells in battery pack) is calibrated in advance, for example, to vbal= 3.435V (average) ×n (N is number of strings), corresponding to soc=92.0%; vtotal=3.440 v×n, corresponding to soc=93.0%; vtotal=3.445 v×n, corresponding soc=94.0%; vtotal= 3.453v×n, corresponding soc=95%. In actual operation, the parameter value can be calibrated in advance by the charge-discharge cabinet before the vehicle leaves the factory and stored in the BMS (battery management system) of the vehicle so as to be called when required.
S3, calibrating the corresponding relation between the lowest voltage of the single body and the SOC in a preset high-end electric quantity range in advance to obtain a third mapping table and storing the third mapping table in a battery management system;
Specifically, SOC corresponding to Vmin (highest voltage in the battery pack) is calibrated in advance, for example, to vmin= 3.430V, and corresponding to soc=94.0%; vmin=3.436V, corresponding to soc=95.0%; vmin=3.444V, corresponding soc=96.0%; vmin= 3.456V, corresponding soc=97.0%. In actual operation, the parameter value can be calibrated in advance by the charge-discharge cabinet before the vehicle leaves the factory and stored in the BMS (battery management system) of the vehicle so as to be called when required.
Step S4, monitoring the highest voltage of the single body, the total voltage of the battery pack and the lowest voltage of the single body in real time in the actual charging process, and calling and inquiring the corresponding first mapping table, second mapping table and third mapping table based on the monitoring result;
Step S5, after corresponding SOC values are respectively obtained according to the first mapping table, the second mapping table and the third mapping table, the minimum SOC value is selected as a correction value to dynamically correct the current SOC;
and S6, outputting the corrected SOC and displaying the SOC.
Of course, it is also possible to supplement this step by synchronizing the corrected SOC to the charging post in real time, i.e. informing the charging post of a relatively more accurate current SOC charge. Furthermore, in other preferred embodiments of the present invention, the number of SOC corrections and which map is used (i.e., corrections based on that parameter in highest monomer, lowest monomer, total pressure) may be recorded by the BMS.
Through taking the highest voltage of the battery core, the lowest voltage of the battery core and the total voltage in the battery pack, taking small in the charging process of the high end of the SOC to carry out real-time SOC calibration, even if a charging pile cannot be charged to 100%, the SOC can be corrected into a more accurate numerical value in advance, and through taking the minimum values of three values to be corrected, the problem of the virtual high of the SOC is effectively avoided, the probability of sit when discharging to the low end of the SOC is reduced, and the method is illustrated: the SOC shows 10% and the actual SOC12% and the probability of low-side SOC sit can be reduced.
In summary, the main design concept of the present invention is that in the preset high-end electric quantity range, the corresponding table of the highest voltage and the SOC of the single body, the corresponding table of the total voltage and the SOC of the battery pack, and the corresponding table of the lowest voltage and the SOC of the single body are calibrated in advance, in the actual charging process, the highest voltage of the single body, the total voltage of the battery pack, and the lowest voltage of the single body are monitored in real time, and the corresponding relation table is called and queried based on the monitoring result to obtain the corresponding target SOC value, and then the minimum target SOC value is selected to dynamically correct the current SOC and output the SOC after display correction. According to the invention, in the charging process of the charging pile, when the vehicle SOC is charged to a high-end area, such as a 95% -98% interval, and before the charging current is stopped, the new energy vehicle is actively and dynamically corrected in advance, the problem of deficiency and high correction value is avoided, and the SOC error caused by the acquisition error is effectively eliminated.
In embodiments of the present invention, when reference is made to a phrase that expresses an orientation, it is based on the relative concepts of the embodiments, with the proviso that "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relation of association objects, and indicates that there may be three kinds of relations, for example, a and/or B, and may indicate that a alone exists, a and B together, and B alone exists. Wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of the following" and the like means any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.
The construction, features and effects of the present invention are described in detail according to the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention, and it should be understood that the technical features of the above embodiment and the preferred mode thereof can be reasonably combined and matched into various equivalent schemes by those skilled in the art without departing from or changing the design concept and technical effects of the present invention; therefore, the invention is not limited to the embodiments shown in the drawings, but is intended to be within the scope of the invention as long as changes made in the concept of the invention or modifications to the equivalent embodiments do not depart from the spirit of the invention as covered by the specification and drawings.
Claims (6)
1. The utility model provides an electric motor car high-end electric quantity SOC calibration method for charging process which characterized in that includes:
calibrating the corresponding relation between the highest voltage of a single body and the SOC in a preset high-end electric quantity range in advance to obtain a first mapping table;
calibrating the corresponding relation between the total voltage of the battery pack and the SOC in a preset high-end electric quantity range in advance to obtain a second mapping table;
Calibrating the corresponding relation between the lowest voltage of the monomer and the SOC in a preset high-end electric quantity range in advance to obtain a third mapping table;
In the actual charging process, monitoring the highest voltage of the single body, the total voltage of the battery pack and the lowest voltage of the single body in real time, and calling and inquiring the corresponding first mapping table, second mapping table and third mapping table based on the monitoring result;
After corresponding SOC values are respectively obtained according to the first mapping table, the second mapping table and the third mapping table, the smallest SOC value is selected as a correction value to dynamically correct the current SOC;
And outputting the corrected SOC to display.
2. The method for calibrating a high-side charge SOC of an electric vehicle for a charging process of claim 1, wherein the preset high-side charge range includes any range value combination of 92% to 98%.
3. The method for calibrating a high-side charge SOC of an electric vehicle for a charging process of claim 1, further comprising: in the correction process, the SOC correction times and the mapping table correspondingly adopted are recorded.
4. The method for calibrating the SOC of the high-end electric power of the electric vehicle for the charging process according to claim 1, wherein the pre-calibration method comprises: before leaving the factory, the vehicle is calibrated through the charging and discharging cabinet and stored in a battery management system of the vehicle.
5. The method for calibrating a high-side charge SOC of an electric vehicle for a charging process of claim 1, further comprising: and synchronizing the corrected SOC to the charging pile in real time.
6. The method for calibrating the SOC of the high-end electric power of the electric vehicle for the charging process according to any one of claims 1 to 5, wherein the total battery pack voltage=the average of the cell voltages in the battery pack x the number of cells connected in series in the battery pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202410274287.0A CN118033517A (en) | 2024-03-11 | 2024-03-11 | Electric vehicle high-end electric quantity SOC calibration method for charging process |
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| CN202410274287.0A CN118033517A (en) | 2024-03-11 | 2024-03-11 | Electric vehicle high-end electric quantity SOC calibration method for charging process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118294820A (en) * | 2024-06-06 | 2024-07-05 | 比亚迪股份有限公司 | Battery state of charge (SOC) estimation method, device, medium, product and equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118294820A (en) * | 2024-06-06 | 2024-07-05 | 比亚迪股份有限公司 | Battery state of charge (SOC) estimation method, device, medium, product and equipment |
| CN118294820B (en) * | 2024-06-06 | 2024-09-10 | 比亚迪股份有限公司 | Battery state of charge (SOC) estimation method, device, medium, product and equipment |
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