CN108521155B - Electric vehicle charging early warning method and system - Google Patents
Electric vehicle charging early warning method and system Download PDFInfo
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- CN108521155B CN108521155B CN201810435354.7A CN201810435354A CN108521155B CN 108521155 B CN108521155 B CN 108521155B CN 201810435354 A CN201810435354 A CN 201810435354A CN 108521155 B CN108521155 B CN 108521155B
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Abstract
The invention discloses an electric vehicle charging early warning method and system, wherein the method comprises the following steps: acquiring battery information of each single battery in the electric automobile; measuring the charging real-time voltage of each single battery in real time; judging the type of the battery of the electric automobile and the aging degree of the battery; obtaining early warning information according to the type and the aging degree of the battery; determining a first early warning voltage value and a second early warning voltage value; judging whether the charging real-time voltage is greater than the second early warning voltage value or not, and if not, performing a high-rate charging mode; if so, judging whether the charging real-time voltage is smaller than a first early warning voltage value; if the current value is less than the preset value, an alarm is sent out, and the high-rate charging mode is converted into the low-rate charging mode; otherwise, stopping charging. By adopting the method or the system, the working pressure of the BMS is reduced, the charging accident caused by BMS fault is avoided, the automobile cost is reduced and the safety is improved.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to an electric automobile charging early warning method and system.
Background
In the charging safety monitoring of the existing electric automobile, the charging safety monitoring is completed by a Battery Management System (BMS), and because the number of single batteries in the Battery system is large, the BMS still needs to perform further analysis until judgment is made after information acquisition of each single Battery is completed, so that great working pressure is applied to the BMS, and the BMS is high in cost and low in efficiency. After all, the capacity of the BMS is limited, and if the BMS breaks down, safety problems such as battery overcharge are easily caused. The early warning information that charges in the BMS is the cut-off voltage that charges of battery usually, because the early warning information of battery in the BMS is integrated when the car leaves the factory, probably along with the ageing of battery, this kind of early warning information has become invalid, causes the incident when charging easily.
In the charging process of the current electric automobile, the BMS sends a charging request signal to the charging pile by detecting the information of each single battery. The charging pile is responsible for responding to a charging request of the BMS and delivering corresponding charging power to the electric automobile. The whole charging process is controlled by the BMS, and the safety early warning of battery charging is taken into account in the charging process, so that accidents caused by overcharge of the battery are prevented. The pre-warning information for preventing the safety of charging is generally the cut-off voltage of the battery, and such pre-warning information is integrated in the BMS when the automobile leaves the factory without being adjusted according to the aging of the battery.
Disclosure of Invention
The invention aims to provide an electric vehicle charging early warning method and system, and solves the problem that a battery management system cannot early warn a battery of an electric vehicle in real time.
In order to achieve the purpose, the invention provides the following scheme:
an electric vehicle charging early warning method comprises the following steps:
acquiring battery information of each single battery in the electric automobile; the battery information comprises the automobile model and historical charging data;
measuring the charging real-time voltage of each single battery in real time;
judging the battery type of the electric automobile according to the automobile model;
judging the aging degree of the single battery of the electric automobile according to the historical charging data;
obtaining early warning information of the single battery according to the battery type and the aging degree;
determining a first early warning voltage value and a second early warning voltage value according to the early warning information; the second early warning voltage value is smaller than the first early warning voltage value;
judging whether the charging real-time voltage is greater than the second early warning voltage value or not to obtain a first judgment result;
if the first judgment result shows that the charging real-time voltage is not greater than the second early warning voltage value, a high-magnification charging mode is carried out; the high-rate charging mode is to charge by taking second set power as a standard;
if the first judgment result shows that the charging real-time voltage is greater than the second early warning voltage value, judging whether the charging real-time voltage is less than the first early warning voltage value to obtain a second judgment result;
if the second judgment result shows that the charging real-time voltage is smaller than the first early warning voltage value, an alarm is given out, and a large-magnification charging mode is converted into a small-magnification charging mode; the small-magnification charging mode is to charge by taking first set power as a standard, and the second set power is greater than the first set power;
and if the second judgment result shows that the charging real-time voltage is not less than the first early warning voltage value, stopping charging.
Optionally, the acquiring battery information of each battery cell in the electric vehicle specifically includes:
the monitoring and early warning platform receives the battery information of each single battery, which is acquired by the battery management system sent by the transfer module in real time.
Optionally, the monitoring and early warning platform receives battery information of each battery cell acquired in real time by the battery management system sent by the transfer module, and the battery information specifically includes:
judging whether the monitoring early warning platform receives battery information of each single battery sent by the vehicle-mounted terminal or not to obtain a third judgment result;
if the third judgment result shows that the monitoring and early warning platform does not receive the information of each single battery sent by the vehicle-mounted terminal, receiving the battery information of each single battery sent by a charging pile; otherwise, judging the battery type of the electric automobile according to the automobile model.
An electric vehicle charging early warning system, comprising:
the information acquisition module is used for acquiring battery information of each single battery in the electric automobile; the battery information comprises the automobile model and historical charging data;
the real-time voltage measuring module is used for measuring the charging real-time voltage of each single battery in real time;
the battery type judging module is used for judging the battery type of the electric automobile according to the automobile model;
the battery state judging module is used for judging the aging degree of the single battery of the electric automobile according to the historical charging data;
the early warning information determining module is used for obtaining the early warning information of the single battery according to the battery type and the aging degree;
the early warning value determining module is used for determining a first early warning voltage value and a second early warning voltage value according to the early warning information; the second early warning voltage value is smaller than the first early warning voltage value;
the first judgment module is used for judging whether the charging real-time voltage is greater than the second early warning voltage value or not to obtain a first judgment result;
the high-rate charging module is used for performing a high-rate charging mode if the first judgment result shows that the charging real-time voltage is not greater than the second early warning voltage value; the high-rate charging mode is to charge by taking second set power as a standard;
the second judgment module is used for judging whether the charging real-time voltage is smaller than the first early warning voltage value or not to obtain a second judgment result if the first judgment result shows that the charging real-time voltage is larger than the second early warning voltage value;
the charging change module is used for giving an alarm and converting a high-rate charging mode into a low-rate charging mode if the second judgment result shows that the charging real-time voltage is smaller than the first early warning voltage value; the small-magnification charging mode is to charge by taking first set power as a standard, and the second set power is greater than the first set power;
and the charging stopping module is used for stopping charging if the second determination result shows that the charging real-time voltage is not less than the first early warning voltage value.
Optionally, the information obtaining module specifically includes:
and the information receiving unit is used for receiving the battery information of each single battery, which is acquired by the battery management system sent by the transfer module in real time, by the monitoring and early warning platform.
Optionally, the information receiving unit specifically includes:
the third judging unit is used for judging whether the monitoring early warning platform receives the battery information of each single battery sent by the vehicle-mounted terminal to obtain a third judging result;
the data conversion unit is used for receiving the battery information of each single battery sent by the charging pile if the third judgment result shows that the monitoring and early warning platform does not receive the battery information of each single battery sent by the vehicle-mounted terminal; otherwise, judging the battery type of the electric automobile according to the automobile model.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the method comprises the steps of receiving information of each single battery of the electric automobile collected by a battery management system through a monitoring and early warning platform, judging information such as automobile types and historical charging data according to the information of each single battery, and then monitoring and early warning the rechargeable battery in real time according to the information. According to the invention, the charging early warning work of the electric automobile is completed through the monitoring early warning platform, and not only the BMS is needed, so that the working pressure of the BMS is reduced, the charging accident caused by BMS failure is avoided, the automobile cost is reduced, and the safety is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flowchart of an electric vehicle charging early warning method according to an embodiment of the present invention;
FIG. 2 is a block diagram of an electric vehicle charging early warning system according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a relationship between a battery voltage and a remaining battery capacity of an electric vehicle according to an embodiment of the present invention;
FIG. 4 is a graph showing the variation trend of the battery voltage under different charging rates according to the embodiment of the present invention;
FIG. 5 is a diagram illustrating a variation trend of battery temperature under different charging rates according to an embodiment of the present invention;
FIG. 6 is a graph of voltage change rate according to an embodiment of the present invention;
FIG. 7 is a graph of temperature rate of change according to an embodiment of the present invention;
FIG. 8(a) is a graph of voltage rate of change versus voltage for an embodiment of the present invention;
FIG. 8(b) is an enlarged view of the voltage variation rate with voltage according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an electric vehicle charging early warning method and system, and solves the problem that a battery management system cannot early warn a battery of an electric vehicle in real time.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of an electric vehicle charging early warning method according to an embodiment of the present invention. Referring to fig. 1, an electric vehicle charging early warning method includes:
step 101: acquiring battery information of each single battery in the electric automobile; the battery information comprises the automobile model and historical charging data;
step 102: measuring the charging real-time voltage of each single battery in real time;
step 103: judging the battery type of the electric automobile according to the automobile model;
step 104: judging the aging degree of the single battery of the electric automobile according to the historical charging data;
step 105: obtaining early warning information of the single battery according to the battery type and the aging degree;
step 106: determining a first early warning voltage value and a second early warning voltage value according to the early warning information; the second early warning voltage value is smaller than the first early warning voltage value;
step 107: judging whether the charging real-time voltage is greater than the second early warning voltage value or not to obtain a first judgment result;
step 108: if the first judgment result shows that the charging real-time voltage is not greater than the second early warning voltage value, a high-magnification charging mode is carried out; the high-rate charging mode is to charge by taking second set power as a standard;
step 109: if the first judgment result shows that the charging real-time voltage is greater than the second early warning voltage value, judging whether the charging real-time voltage is less than the first early warning voltage value to obtain a second judgment result;
step 110: if the second judgment result shows that the charging real-time voltage is smaller than the first early warning voltage value, an alarm is given out, and a large-magnification charging mode is converted into a small-magnification charging mode; the small-magnification charging mode is to charge by taking first set power as a standard, and the second set power is greater than the first set power;
step 111: and if the second judgment result shows that the charging real-time voltage is not less than the first early warning voltage value, stopping charging.
By adopting the method, more real and reliable early warning information is provided for the charging safety of the battery of the electric automobile, the BMS only plays a role in information acquisition of each single battery, and the information extraction and judgment are completed through the early warning platform, so that the working pressure of the BMS is greatly reduced, and the cost is favorably reduced.
Step 101 specifically includes:
the monitoring and early warning platform receives the battery information of each single battery, which is acquired by the battery management system sent by the transfer module in real time.
In the method, the step of receiving, by the monitoring and early warning platform, the battery information of each battery cell, which is acquired in real time by the battery management system and sent by the transfer module, specifically includes:
judging whether the monitoring early warning platform receives battery information of each single battery sent by the vehicle-mounted terminal or not to obtain a third judgment result;
if the third judgment result shows that the monitoring and early warning platform does not receive the information of each single battery sent by the vehicle-mounted terminal, receiving the battery information of each single battery sent by a charging pile;
otherwise, judging the battery type of the electric automobile according to the automobile model.
Fig. 2 is a block diagram of an electric vehicle charging early warning system according to an embodiment of the present invention. Referring to fig. 2, an electric vehicle charging early warning system includes:
the information acquisition module 201 is configured to acquire battery information of each battery cell in the electric vehicle; the battery information comprises the automobile model and historical charging data;
a real-time voltage measurement module 202, configured to measure the charging real-time voltage of each single battery in real time;
the battery type judging module 203 is used for judging the battery type of the electric automobile according to the automobile model;
the battery state judging module 204 is used for judging the aging degree of the single batteries of the electric automobile according to the historical charging data;
the early warning information determining module 205 is configured to obtain early warning information of the single battery according to the battery type and the aging degree;
an early warning value determining module 206, configured to determine a first early warning voltage value and a second early warning voltage value according to the early warning information; the second early warning voltage value is smaller than the first early warning voltage value;
the first judging module 207 is configured to judge whether the charging real-time voltage is greater than the second early warning voltage value, so as to obtain a first judgment result;
a high-rate charging module 208, configured to perform a high-rate charging mode if the first determination result indicates that the charging real-time voltage is not greater than the second warning voltage value; the high-rate charging mode is to charge by taking second set power as a standard;
a second determining module 209, configured to determine whether the charging real-time voltage is smaller than the first warning voltage value if the first determination result indicates that the charging real-time voltage is larger than the second warning voltage value, so as to obtain a second determination result;
a charging change module 210, configured to send an alarm and change a high-rate charging mode to a low-rate charging mode if the second determination result indicates that the charging real-time voltage is smaller than the first warning voltage value; the small-magnification charging mode is to charge by taking first set power as a standard, and the second set power is greater than the first set power;
the charging stopping module 211 is configured to stop charging if the second determination result indicates that the charging real-time voltage is not less than the first warning voltage value.
According to the system, the charging early warning work of the electric automobile is completed through the early warning platform, and not only the BMS is needed, so that the working pressure of the BMS is reduced, the charging accident caused by BMS failure is avoided, the automobile cost is reduced, and the safety is improved.
The specific method for obtaining the early warning information of the single battery in the early warning information determination module 205 is as follows: a database is set in the monitoring and early warning platform, a plurality of groups of battery information are stored in the database, and each group of battery information comprises corresponding battery type, aging degree and early warning information. After the battery type and the aging degree of the vehicle are obtained in real time, corresponding early warning information under the condition of the same battery type and the same aging degree can be found in a database, and the early warning information is the early warning information of the single battery.
The information obtaining module 201 specifically includes:
and the information receiving unit is used for receiving the battery information of each single battery, which is acquired by the battery management system sent by the transfer module in real time, by the monitoring and early warning platform.
The information receiving unit specifically includes:
the third judging unit is used for judging whether the monitoring early warning platform receives the battery information of each single battery sent by the vehicle-mounted terminal to obtain a third judging result;
and the data conversion unit is used for receiving the battery information of each single battery sent by the charging pile if the third judgment result shows that the monitoring and early warning platform does not receive the battery information of each single battery sent by the vehicle-mounted terminal.
The monitoring and early warning platform can update the early warning information of each battery in the database of the monitoring and early warning platform in different aging degrees through periodic test, so that the charging monitoring is safer.
Fig. 3 is a diagram of a relationship between battery voltage and remaining battery capacity of an electric vehicle according to an embodiment of the present invention, and referring to fig. 3, the early warning information of each type of battery at different aging degrees is extracted through experiments specifically as follows:
(1) and carrying out constant current charging on batteries of different types and different aging degrees at different charging multiplying powers, and not setting a cut-off voltage until the battery deformation records the voltage V and the SOC of the battery.
(2) A curve is made with the voltage V on the abscissa and dV/dSOC on the ordinate.
(3) The curve has a peak, the voltage value corresponding to the beginning of the peak is taken as the second early warning voltage value, and the voltage value corresponding to the maximum peak value is taken as the first early warning voltage value.
Meanwhile, the invention also relates to a method for extracting the first early warning voltage value and the second early warning voltage value. The specific method comprises the following steps:
(1) the basic voltage and temperature profiles for different rates of battery charging to swelling were plotted, see fig. 4 and 5. Through the comparative analysis of experimental results, the voltage and the temperature rise cannot be used as characterization parameters for monitoring the charging safety of the battery on line, because the temperature rise and the voltage change at different multiplying powers are too large, if the temperature rise and the voltage change at different multiplying powers, a large number of experiments are needed to calibrate the battery, and a rule is obtained.
(2) The characteristic extraction is carried out on the curve during charging, the curve represented by the voltage change rate (figure 6) and the temperature change rate (figure 7) is adopted to demonstrate the effectiveness of the extracted quantity expression early warning information, and the curve is obtained by analyzing the processed experimental data: the adoption of the voltage change rate and the temperature change rate to represent the charging safety parameters is more reasonable than the direct adoption of the temperature and voltage form, because the voltage change rate curve and the temperature change rate curve under different multiplying factors have the same shape.
Taking the voltage change rate as an example, each charging multiplying factor corresponds to a peak value, the moment when the peak value starts can be selected as the second alternative early warning voltage value, and the moment when the peak value is reached can be selected as the first alternative early warning voltage value.
Taking the temperature change rate as an example, each charging multiplying factor corresponds to an inflection point, and the inflection point is used as a second alternative early warning voltage value.
The second warning voltage value extracted from the temperature change rate is compared with the second warning voltage value extracted from the voltage change rate, and it is found that the information extracted from the voltage change rate is earlier than the information extracted from the temperature change rate by a certain period of time.
Through the analysis, the initial time of the voltage change rate peak value and the maximum time of the peak value are used as early warning information, but the values under different charging multiplying factors have certain difference, the online early warning has certain difficulty, the charging multiplying factors need to be identified and further decoupled, and finally, an early warning signal is given out under the obtained charging multiplying factors.
(3) Further processing simplification of charging safety margin parameters
The voltage change rate is plotted on the ordinate and the voltage on the abscissa, and referring to fig. 8(a) and 8(b), it is found that the voltage values at the peak start time of each curve at different charging rates are very close to each other, i.e., about 3.5V, and the peak values are also very close to each other, i.e., about 4.1V. Therefore, the voltage corresponding to the peak starting time is used as the second early warning voltage value, and the voltage corresponding to the peak maximum value is used as the first early warning voltage value.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. The electric vehicle charging early warning method is characterized by comprising the following steps:
acquiring battery information of each single battery in the electric automobile; the battery information comprises the automobile model and historical charging data;
measuring the charging real-time voltage of each single battery in real time;
judging the battery type of the electric automobile according to the automobile model;
judging the aging degree of the single battery of the electric automobile according to the historical charging data;
obtaining early warning information of the single battery according to the battery type and the aging degree;
determining a first early warning voltage value and a second early warning voltage value according to the early warning information; the second early warning voltage value is smaller than the first early warning voltage value;
judging whether the charging real-time voltage is greater than or equal to the second early warning voltage value or not to obtain a first judgment result;
if the first judgment result shows that the charging real-time voltage is not greater than the second early warning voltage value, a high-magnification charging mode is carried out; the high-rate charging mode is to charge by taking second set power as a standard;
if the first judgment result shows that the charging real-time voltage is greater than the second early warning voltage value, judging whether the charging real-time voltage is less than the first early warning voltage value to obtain a second judgment result;
if the second judgment result shows that the charging real-time voltage is smaller than the first early warning voltage value, an alarm is given out and a large-magnification charging mode is converted into a small-magnification charging mode; the small-magnification charging mode is to charge by taking first set power as a standard, and the second set power is greater than the first set power;
if the second judgment result shows that the charging real-time voltage is not smaller than the first early warning voltage value, stopping charging;
and determining the first early warning voltage value and the second early warning voltage value according to the dV/dSOC curve and the dT/dSOC curve.
2. The early warning method according to claim 1, wherein the acquiring battery information of each battery cell in the electric vehicle specifically comprises:
and the monitoring and early warning platform receives the battery information of each single battery, which is acquired by the battery management system sent by the transfer module in real time.
3. The early warning method according to claim 2, wherein the receiving, by the monitoring and early warning platform, the battery information of the battery cells, which is acquired in real time by the battery management system and sent by the relay module, specifically comprises:
judging whether the monitoring early warning platform receives battery information of each single battery sent by the vehicle-mounted terminal or not to obtain a third judgment result;
if the third judgment result shows that the monitoring and early warning platform does not receive the information of each single battery sent by the vehicle-mounted terminal, receiving the battery information of each single battery sent by a charging pile; otherwise, judging the battery type of the electric automobile according to the automobile model.
4. The utility model provides an electric automobile early warning system that charges which characterized in that includes:
the information acquisition module is used for acquiring battery information of each single battery in the electric automobile; the battery information comprises the automobile model and historical charging data;
the real-time voltage measuring module is used for measuring the charging real-time voltage of each single battery in real time;
the battery type judging module is used for judging the battery type of the electric automobile according to the automobile model;
the battery state judging module is used for judging the aging degree of the single battery of the electric automobile according to the historical charging data;
the early warning information determining module is used for obtaining the early warning information of the single battery according to the battery type and the aging degree;
the early warning value determining module is used for determining a first early warning voltage value and a second early warning voltage value according to the early warning information; the second early warning voltage value is smaller than the first early warning voltage value;
the first judgment module is used for judging whether the charging real-time voltage is greater than the second early warning voltage value or not to obtain a first judgment result;
the high-rate charging module is used for performing a high-rate charging mode if the first judgment result shows that the charging real-time voltage is not greater than the second early warning voltage value; the high-rate charging mode is to charge by taking second set power as a standard;
the second judgment module is used for judging whether the charging real-time voltage is smaller than the first early warning voltage value or not to obtain a second judgment result if the first judgment result shows that the charging real-time voltage is larger than the second early warning voltage value;
the charging change module is used for giving an alarm and converting a high-rate charging mode into a low-rate charging mode if the second judgment result shows that the charging real-time voltage is smaller than the first early warning voltage value; the small-magnification charging mode is to charge by taking first set power as a standard, and the second set power is greater than the first set power;
the charging stopping module is used for stopping charging if the second determination result shows that the charging real-time voltage is not smaller than the first early warning voltage value;
and determining the first early warning voltage value and the second early warning voltage value according to the dV/dSOC curve and the dT/dSOC curve.
5. The early warning system of claim 4, wherein the information acquisition module specifically comprises:
and the information receiving unit is used for receiving the battery information of each single battery, which is acquired by the battery management system sent by the transfer module in real time, by the monitoring and early warning platform.
6. The warning system of claim 5, wherein the information receiving unit specifically comprises:
the third judging unit is used for judging whether the monitoring early warning platform receives the battery information of each single battery sent by the vehicle-mounted terminal to obtain a third judging result;
the data conversion unit is used for receiving the battery information of each single battery sent by the charging pile if the third judgment result shows that the monitoring and early warning platform does not receive the battery information of each single battery sent by the vehicle-mounted terminal; otherwise, judging the battery type of the electric automobile according to the automobile model.
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| CN111483350B (en) * | 2020-05-15 | 2022-11-08 | 金陵科技学院 | Balance and micro-short circuit detection method for power battery pack |
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| CN102540096B (en) * | 2012-01-17 | 2014-07-23 | 浙江大学 | Self-correction method for remaining capacity estimation of lithium iron phosphate power battery |
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