CN108051754B - Method, device and system for calculating residual electric quantity of vehicle lithium battery and vehicle - Google Patents
Method, device and system for calculating residual electric quantity of vehicle lithium battery and vehicle Download PDFInfo
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Abstract
The invention discloses a method, a device and a system for calculating the residual electric quantity of a lithium battery of a vehicle and the vehicle, wherein the method comprises the following steps: detecting the current time; acquiring the updating time of each electric quantity interval of the discharging electricity meter; determining an electric quantity interval to be corrected of the discharging electric quantity meter according to the current time and the updating time of each electric quantity interval; and fitting and correcting the to-be-corrected electric quantity interval according to the data curve of the initial discharge electricity meter to obtain an updated discharge electricity meter so as to obtain the current residual electric quantity of the lithium battery through the updated discharge electricity meter. The method can perform fitting correction on the discharging electricity meter according to the current time and the updating time of each electricity quantity interval, so that the current residual electricity quantity of the lithium battery is accurately obtained, the practicability of the vehicle is effectively improved, the reliability of the vehicle is improved, and the driving experience of a user is effectively improved.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a method, a device and a system for calculating the residual electric quantity of a lithium battery of a vehicle and the vehicle.
Background
In the related art, energy Management of a pure electric vehicle is based on statistical analysis of charging and discharging capacities of lithium batteries, and the principle is that the rated capacity of a lithium Battery of an electric vehicle is multiplied by an SOC (State of Charge) of a Battery Management Unit BMU (Battery Management Unit) to calculate the remaining electric quantity.
However, the related art does not consider the influence of the current capacity, environment, voltage and comprehensive capacity of the battery on the residual electric quantity in the use process of the lithium battery, and once the residual electric quantity changes, if the displayed electric quantity is greater than the actual quantity, the situation that the electric quantity is considered to be sufficient by mistake and the charging is not carried out in time is caused, so that the normal use is influenced, and the practicability of the vehicle is reduced; or the displayed electric quantity is smaller than the actual electric quantity, so that frequent charging is caused, the reliability of the vehicle is reduced, and the driving experience of a user is reduced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the first objective of the present invention is to provide a method for calculating the remaining power of a lithium battery of a vehicle, which can accurately obtain the current remaining power of the lithium battery, effectively improve the practicability of the vehicle, improve the reliability of the vehicle, and effectively improve the driving experience of a user.
The second purpose of the invention is to provide a residual capacity calculation device of a vehicle lithium battery.
A third object of the present invention is to provide a battery management system.
A fourth object of the invention is to propose a vehicle.
In order to achieve the above object, an embodiment of the invention provides a method for calculating a remaining power of a lithium battery of a vehicle, including the following steps: detecting the current time; acquiring the updating time of each electric quantity interval of the discharging electricity meter; determining an electric quantity interval to be corrected of the discharging electric quantity meter according to the current time and the updating time of each electric quantity interval; and fitting and correcting the electric quantity interval to be corrected according to a data curve of the initial discharge electric quantity meter to obtain an updated discharge electric quantity meter so as to obtain the current residual electric quantity of the lithium battery through the updated discharge electric quantity meter.
According to the method for calculating the residual electric quantity of the vehicle lithium battery, the discharging electricity meter can be subjected to fitting correction according to the current time and the updating time of each electric quantity interval, so that the current residual electric quantity of the lithium battery is accurately obtained, reliable input is provided for scientifically predicting the endurance mileage, reasonably distributing electric energy to a power system and a passenger comfort system and the like, the practicability of the vehicle is effectively improved, the reliability of the vehicle is improved, and the driving experience of a user is effectively improved.
In addition, the method for calculating the remaining capacity of the lithium battery of the vehicle according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, the method further includes: establishing the initial discharge electricity meter; sampling and integrating the discharge power output by the lithium battery to obtain the discharge electric quantity of each electric quantity interval in the initial discharge electric quantity meter and generate the discharge electric quantity meter; and updating the discharge electricity meter according to the current discharge electricity quantity of the lithium battery, and recording the updating time of each electricity quantity interval.
Further, in an embodiment of the present invention, before establishing the initial discharge electricity meter, the method includes: and partitioning the charge state of the lithium battery according to a preset unit step length so as to establish the discharge electricity meter according to a partitioning result.
Further, in an embodiment of the present invention, the obtaining the current remaining capacity of the lithium battery by using the updated discharge electricity meter further includes: acquiring the current charge state of the lithium battery; obtaining an electric quantity interval meeting preset conditions according to the current charge state; and accumulating according to the electric quantity of the electric quantity interval meeting the preset condition to obtain the current residual electric quantity.
Further, in an embodiment of the present invention, the electric quantity section of the preset condition is an electric quantity section where the current state of charge is located and an electric quantity section below the located electric quantity section.
In order to achieve the above object, a second embodiment of the present invention provides a remaining capacity calculating device for a lithium battery of a vehicle, including: the detection module is used for detecting the current time; the first acquisition module is used for acquiring the updating time of each electric quantity interval of the discharging electricity meter; the confirming module is used for determining an electric quantity interval to be corrected of the discharging electric quantity meter according to the current time and the updating time of each electric quantity interval; and the second acquisition module is used for fitting and correcting the electric quantity interval to be corrected according to the data curve of the initial discharge electric quantity meter, acquiring an updated discharge electric quantity meter and acquiring the current residual electric quantity of the lithium battery through the updated discharge electric quantity meter.
According to the device for calculating the residual electric quantity of the vehicle lithium battery, the discharging electricity meter can be subjected to fitting correction according to the current time and the updating time of each electric quantity interval, so that the current residual electric quantity of the lithium battery is accurately obtained, reliable input is provided for scientifically predicting the endurance mileage, reasonably distributing electric energy to a power system and a passenger comfort system and the like, the practicability of the vehicle is effectively improved, the reliability of the vehicle is improved, and the driving experience of a user is effectively improved.
In addition, the remaining capacity calculation apparatus for a lithium battery of a vehicle according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, the apparatus further includes: the establishing module is used for establishing the initial discharging electricity meter; the generating module is used for sampling and integrating the discharging power output by the lithium battery to obtain the discharging electric quantity of each electric quantity interval in the initial discharging electric quantity meter and generating the discharging electric quantity meter; and the updating module is used for updating the discharging electricity meter according to the current discharging electricity quantity of the lithium battery and recording the updating time of each electricity quantity interval.
Further, in an embodiment of the present invention, the apparatus further includes: and the partitioning module is used for partitioning the charge state of the lithium battery according to a preset unit step length so as to establish the discharge electricity meter according to a partitioning result.
In order to achieve the above object, a battery management system according to a third embodiment of the present invention includes the above device for calculating remaining capacity of a lithium battery of a vehicle. The system can perform fitting correction on the discharging electricity meter according to the current time and the updating time of each electricity quantity interval, so that the current residual electricity quantity of the lithium battery is accurately obtained, the scientific predicted endurance mileage is realized, the reasonable electric energy distribution power supply system and the passenger comfort system are adopted, the reliable input is provided, the practicability of the vehicle is effectively improved, the reliability of the vehicle is improved, and the driving experience of a user is effectively improved.
In order to achieve the above object, a fourth aspect of the present invention provides a vehicle including the above battery management system. This vehicle can carry out the fitting correction to the electric quantity meter that discharges according to the update time between current time and every electric quantity interval to the accurate current residual capacity that obtains the lithium cell provides reliable input for the prediction continuation of the journey mileage of science, for reasonable distribution electric energy supply driving system and passenger comfort system etc. effectively improves the practicality of vehicle, and improves the reliability of vehicle, effectively promotes the user and drives and take experience.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a method for calculating a remaining capacity of a lithium battery of a vehicle according to an embodiment of the present invention; and
fig. 2 is a schematic structural diagram of a remaining power calculating apparatus of a lithium battery for a vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Before describing the method, the device, the system and the vehicle for calculating the remaining power of the lithium battery of the vehicle, which are provided by the embodiment of the invention, the problems of the lithium battery in the use and discharge process are briefly described.
Firstly, when a lithium battery is used, after a large number of charge and discharge cycles, lithium ions are continuously absorbed and released by a lithium compound forming a negative electrode in a chemical reaction, ion exchange becomes more and more difficult due to structural change of the lithium battery, and the maximum capacity of the battery is irreversibly reduced along with the increase of service time of the battery due to the continuous oxidation process of an electrode by an electrolyte. Because the speed of chemical reaction is influenced by temperature to a great extent, the aging degree of the battery is not directly hooked with the time, and therefore the maximum capacity of the battery cannot be simply calculated according to the service time of the battery.
Secondly, the discharge process of the lithium battery is a complex nonlinear chemical reaction process, the discharge current changes along with the change of the load, and the heat energy generated by the internal resistance of the battery increases along with the increase of the discharge current, so that the change of the discharge electric quantity of the battery corresponding to the charge state of the battery presents the characteristic of nonlinear change. When the voltage of the single lithium battery is lower than a (a is the specific voltage of the lithium battery with different lithium compounds forming the cathode), the lithium battery can not continue to discharge, and the residual dischargeable capacity of the battery is 0.
Based on the above problem, in order to accurately obtain the current actual capacity of the lithium battery, the embodiment of the invention provides a method, a device, a system and a vehicle for calculating the remaining power of the lithium battery of the vehicle.
The following describes a method, an apparatus, a system and a vehicle for calculating a remaining capacity of a lithium battery of a vehicle according to an embodiment of the present invention with reference to the accompanying drawings, and first, a method for calculating a remaining capacity of a lithium battery of a vehicle according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for calculating a remaining capacity of a lithium battery of a vehicle according to an embodiment of the present invention.
As shown in fig. 1, the method for calculating the remaining capacity of a lithium battery of a vehicle includes the steps of:
in step S101, the current time is detected.
Specifically, the embodiment of the present invention may perform the detection of the current time by a time detection device, such as an electronic watch on the vehicle or a microcomputer on the vehicle.
In step S102, the update time of each electricity amount section of the discharged electricity amount meter is acquired.
It can be understood that, during discharging, each time the discharging amount passes through the interval (for example, SOC 80% -79%), the discharging amount and the updating time corresponding to the interval are updated, regardless of whether the discharging amount is the same number, and the updating time is necessarily new. However, the user of the electric vehicle usually charges the battery when the battery is not completely exhausted (which is a reasonable and healthy usage manner of the lithium battery), for example, the battery is charged when the SOC is 30%, so that all the discharge intervals located in the electricity meter in the SOC range of 30% -0% cannot be continuously updated. Therefore, the update time of each electricity quantity interval is different according to the different intervals of the SOC during charging, so that the update time of each electricity quantity interval of the discharged electricity quantity meter needs to be acquired to perform the next operation.
Further, in an embodiment of the present invention, before the establishing of the initial discharge electricity meter, the method includes: and partitioning the charge state of the lithium battery according to a preset unit step length so as to establish a discharge electricity meter according to a partitioning result.
For example, the state of charge SOC of the BATTERY management unit BMS (BATTERY MANAGEMENT SYSTEM ) may be manually partitioned according to 1% unit step size, and a discharge electricity meter corresponding to each SOC interval of the BATTERY may be established. As shown in table 1, the SOC is 100, and is partitioned according to 1% unit step, then 99-100 are one partition, 98-99 are another partition, and up to 0-1 are one partition, so that the SOC can be divided into 100 partitions. Table 1 is a discharge electricity meter.
TABLE 1
| Battery SOC interval (%) | Discharging electricity quantity (WH) | Update Date (Date) |
| 99～100 | 520 | 2017-11-6 |
| 98～99 | 516 | 2017-11-7 |
| 97～98 | 512 | 2017-11-7 |
| …… | …… | …… |
| 2～3 | 50 | 2017-11-5 |
| 1～2 | 10 | 2017-10-10 |
| 0～1 | 0 | 2017-10-10 |
In step S103, a to-be-corrected power amount interval of the discharge power amount meter is determined according to the current time and the update time of each power amount interval.
For example, if the user is charged at 30% of the SOC, all the discharge intervals located in the electricity meter in the range of 30% to 0% of the SOC cannot be continuously updated, and therefore, the to-be-corrected electricity amount interval of the discharge electricity meter is determined. When the energy management system finds that the data updating time of a certain SOC interval in the discharge electricity meter exceeds b days from the current time, the SOC interval exceeding b days is the to-be-corrected electricity interval of the discharge electricity meter. Specifically, the SOC interval exceeding several days is the to-be-corrected electric quantity interval of the discharge electricity meter, and the exceeding time may be set according to an actual situation, which is not specifically limited herein.
In step S104, fitting and correcting the to-be-corrected electric quantity interval according to the data curve of the initial discharge electricity meter, and obtaining an updated discharge electricity meter, so as to obtain the current remaining electric quantity of the lithium battery through the updated discharge electricity meter.
For example, when the SOC is 30%, the charging is performed, so that all the discharging intervals located in the electricity meter within the range of 30% to 0% of the SOC cannot be updated continuously, and when the SOC is maximum, in this example, the discharging intervals located in the range of 30% to 29%, the updating time of the discharging intervals is already overtime (the overtime time is set) from the current time, the discharging amount is corrected by performing data fitting on all the discharging intervals located between 30% and 0% of the SOC, and the updating time of the discharging intervals is modified at the same time.
Further, in an embodiment of the present invention, obtaining the current remaining capacity of the lithium battery through the updated discharge electricity meter further includes: acquiring the current charge state of the lithium battery; obtaining an electric quantity interval meeting preset conditions according to the current charge state; and accumulating according to the electric quantity of the electric quantity interval meeting the preset condition to obtain the current residual electric quantity.
Optionally, in an embodiment of the present invention, the electric quantity section of the preset condition is an electric quantity section where the current state of charge is located and an electric quantity section below the located electric quantity section.
Specifically, when the energy management system finds that the data updating date of a certain SOC interval in the discharging electricity meter exceeds b days (b is a standard quantity) from the current date, the energy management system traces back from the point downwards, and all the discharging electricity quantities of the overtime SOC intervals are subjected to fitting correction according to the data curves in the initial default table. Assuming that the unit step length of the current SOC partition is 1%, the SOC on the current BMS is x% (x is an integer), and the accumulated value of the discharge electric quantity of each interval below the beginning interval is S, the residual electric quantity of the current lithium battery is S, so that the residual electric quantity of the current lithium battery can be accurately obtained, the calculation accuracy of the residual energy of the lithium battery is improved, and reliable input is provided for reasonably distributing electric energy to supply a power system, a passenger comfort system and the like.
For example, in the embodiment of the invention, the initial default table can be generated by performing discharge training on the lithium battery of the whole vehicle, that is, sampling and integrating the voltage and the current which are output by the battery in real time by the energy management system, and filling the discharge electric quantity values corresponding to the SOC intervals. Finally, the energy management system continuously updates the table in the using process of the battery, and records the updating date, so that the SOC interval (for example, 95% to 94%) reported by the current BMS corresponds to the collected actual discharge capacity, and the accuracy of the residual electric quantity of the lithium battery can be effectively ensured.
According to the method for calculating the residual electric quantity of the vehicle lithium battery, provided by the embodiment of the invention, the discharging electricity meter can be subjected to fitting correction according to the current time and the updating time of each electric quantity interval, so that the current residual electric quantity of the lithium battery is accurately obtained, reliable input is provided for scientifically predicting the endurance mileage, reasonably distributing electric energy to a power system and a passenger comfort system and the like, the practicability of the vehicle is effectively improved, the reliability of the vehicle is improved, and the driving experience of a user is effectively improved.
Next, a remaining capacity calculation device of a lithium battery for a vehicle according to an embodiment of the present invention will be described with reference to the drawings.
Fig. 2 is a schematic structural diagram of a remaining power calculating device of a lithium battery for a vehicle according to an embodiment of the present invention.
As shown in fig. 2, the remaining capacity calculation apparatus 10 for a lithium battery of a vehicle includes: a detection module 100, a first acquisition module 200, a confirmation module 300, and a second acquisition module 400.
The detecting module 100 is configured to detect a current time. The first obtaining module 200 is configured to obtain an update time of each electricity quantity interval of the discharged electricity quantity meter. The confirming module 300 is configured to determine an electric quantity interval to be corrected of the discharge electric quantity meter according to the current time and the update time of each electric quantity interval. The second obtaining module 400 performs fitting correction on the to-be-corrected electric quantity interval according to the data curve of the initial discharge electricity meter, obtains the updated discharge electricity meter, and obtains the current remaining electric quantity of the lithium battery through the updated discharge electricity meter. The device 10 of the embodiment of the invention can perform fitting correction on the discharging electricity meter according to the current time and the updating time of each electricity quantity interval, thereby accurately obtaining the current residual electricity quantity of the lithium battery, effectively improving the practicability of the vehicle, improving the reliability of the vehicle and effectively improving the driving experience of a user.
Further, in one embodiment of the present invention, the apparatus 10 of the embodiment of the present invention further comprises: the device comprises an establishing module, a generating module and an updating module.
The establishing module is used for establishing an initial discharging electricity meter. The generation module is used for sampling and integrating the discharging power output by the lithium battery so as to obtain the discharging electric quantity of each electric quantity interval in the initial discharging electric quantity meter and generate the discharging electric quantity meter. The updating module is used for updating the discharging electricity meter according to the current discharging electricity quantity of the lithium battery and recording the updating time of each electricity quantity interval.
Further, in one embodiment of the present invention, the apparatus 10 of the embodiment of the present invention further comprises: and (5) partitioning the module. The partitioning module is used for partitioning the charge state of the lithium battery according to a preset unit step length so as to establish a discharge electricity meter according to partitioning results.
It should be noted that the foregoing explanation of the remaining power calculating method embodiment is also applicable to the remaining power calculating apparatus of this embodiment, and is not repeated herein.
According to the residual electric quantity calculating device provided by the embodiment of the invention, the discharging electric quantity meter can be subjected to fitting correction according to the current time and the updating time of each electric quantity interval, so that the current residual electric quantity of the lithium battery can be accurately obtained, reliable input is provided for scientifically predicting the endurance mileage, reasonably distributing an electric energy supply power system and a passenger comfort system and the like, the practicability of the vehicle is effectively improved, the reliability of the vehicle is improved, and the driving experience of a user is effectively improved.
In addition, the embodiment of the invention also provides a battery management system which comprises the device for calculating the residual electric quantity of the lithium battery of the vehicle. The system can perform fitting correction on the discharging electricity meter according to the current time and the updating time of each electricity quantity interval, so that the current residual electricity quantity of the lithium battery is accurately obtained, the scientific predicted endurance mileage is realized, the reasonable electric energy distribution power supply system and the passenger comfort system are adopted, the reliable input is provided, the practicability of the vehicle is effectively improved, the reliability of the vehicle is improved, and the driving experience of a user is effectively improved.
In addition, the embodiment of the invention also provides a vehicle which comprises the battery management system. This vehicle can carry out the fitting correction to the electric quantity meter that discharges according to the update time between current time and every electric quantity interval to the accurate current residual capacity that obtains the lithium cell provides reliable input for the prediction continuation of the journey mileage of science, for reasonable distribution electric energy supply driving system and passenger comfort system etc. effectively improves the practicality of vehicle, and improves the reliability of vehicle, effectively promotes the user and drives and take experience.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method for calculating the residual capacity of a lithium battery of a vehicle is characterized by comprising the following steps:
detecting the current time;
acquiring the updating time of each electric quantity interval of the discharging electricity meter;
determining an electric quantity interval to be corrected of the discharge electric quantity meter according to the current time and the updating time of each electric quantity interval, wherein the determining comprises the following steps: when the data updating time of a certain SOC interval in the discharge electricity meter exceeds b days from the current time, the SOC interval exceeding b days is the to-be-corrected electricity interval of the discharge electricity meter; and
fitting and correcting the to-be-corrected electric quantity interval according to a data curve of the initial discharge electric quantity meter, and acquiring an updated discharge electric quantity meter so as to acquire the current residual electric quantity of the lithium battery through the updated discharge electric quantity meter, wherein the fitting and correction comprises the following steps: establishing the initial discharge electricity meter, sampling and integrating discharge power output by the lithium battery to obtain discharge electricity quantity of each electricity quantity interval in the initial discharge electricity meter, generating the discharge electricity meter, performing fitting correction on the electricity quantity interval to be corrected according to a data curve of the initial discharge electricity meter, obtaining an updated discharge electricity meter, and obtaining the current residual electricity quantity of the lithium battery through the updated discharge electricity meter.
2. The method for calculating the remaining capacity of a lithium battery for a vehicle according to claim 1, further comprising:
establishing the initial discharge electricity meter;
sampling and integrating the discharge power output by the lithium battery to obtain the discharge electric quantity of each electric quantity interval in the initial discharge electric quantity meter and generate the discharge electric quantity meter;
and updating the discharge electricity meter according to the current discharge electricity quantity of the lithium battery, and recording the updating time of each electricity quantity interval.
3. The method for calculating the remaining capacity of a lithium battery of a vehicle according to claim 2, comprising, before establishing the initial discharge electricity meter:
and partitioning the charge state of the lithium battery according to a preset unit step length so as to establish the discharge electricity meter according to a partitioning result.
4. The method for calculating the remaining capacity of a lithium battery of a vehicle according to claim 1, wherein the obtaining the current remaining capacity of the lithium battery by the updated discharge electricity meter further comprises:
acquiring the current charge state of the lithium battery;
obtaining an electric quantity interval meeting preset conditions according to the current charge state;
and accumulating according to the electric quantity of the electric quantity interval meeting the preset condition to obtain the current residual electric quantity.
5. The method for calculating the remaining power of a lithium battery of a vehicle according to claim 4, wherein the power interval of the preset condition is a power interval in which the current state of charge is located and a power interval below the located power interval.
6. A remaining capacity calculation device for a lithium battery of a vehicle, comprising:
the detection module is used for detecting the current time;
the first acquisition module is used for acquiring the updating time of each electric quantity interval of the discharging electricity meter;
the confirming module is used for determining an electric quantity interval to be corrected of the discharging electric quantity meter according to the current time and the updating time of each electric quantity interval, and comprises: when the data updating time of a certain SOC interval in the discharge electricity meter exceeds b days from the current time, the SOC interval exceeding b days is the to-be-corrected electricity interval of the discharge electricity meter; and
the second obtaining module is used for performing fitting correction on the electric quantity interval to be corrected according to a data curve of the initial discharging electric quantity meter, obtaining an updated discharging electric quantity meter, and obtaining the current residual electric quantity of the lithium battery through the updated discharging electric quantity meter, and comprises the following steps: establishing the initial discharge electricity meter, sampling and integrating discharge power output by the lithium battery to obtain discharge electricity quantity of each electricity quantity interval in the initial discharge electricity meter, generating the discharge electricity meter, performing fitting correction on the electricity quantity interval to be corrected according to a data curve of the initial discharge electricity meter, obtaining an updated discharge electricity meter, and obtaining the current residual electricity quantity of the lithium battery through the updated discharge electricity meter.
7. The vehicle lithium battery remaining capacity calculation device according to claim 6, further comprising:
the establishing module is used for establishing the initial discharging electricity meter;
the generating module is used for sampling and integrating the discharging power output by the lithium battery to obtain the discharging electric quantity of each electric quantity interval in the initial discharging electric quantity meter and generating the discharging electric quantity meter;
and the updating module is used for updating the discharging electricity meter according to the current discharging electricity quantity of the lithium battery and recording the updating time of each electricity quantity interval.
8. The vehicle lithium battery remaining capacity calculation device according to claim 6, further comprising:
and the partitioning module is used for partitioning the charge state of the lithium battery according to a preset unit step length so as to establish the discharge electricity meter according to a partitioning result.
9. A battery management system, comprising: the device for calculating the remaining capacity of a lithium battery for a vehicle according to any one of claims 6 to 8.
10. A vehicle, characterized by comprising: the battery management system of claim 9.
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| CN109633447B (en) * | 2019-01-09 | 2022-02-11 | 福建联迪商用设备有限公司 | Remaining power display method and computer-readable storage medium |
| CN111965548B (en) * | 2020-09-27 | 2022-05-17 | 哈尔滨工业大学（威海） | Battery system sensor fault diagnosis method based on state estimation method |
| CN112782735A (en) * | 2020-12-30 | 2021-05-11 | 大运汽车股份有限公司 | Self-learning endurance mileage correction calculation method |
| CN113671387B (en) * | 2021-01-19 | 2024-05-10 | 深圳逸驰新能源科技有限公司 | Electric quantity estimation method and device for lithium battery electric vehicle |
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