CN116068441A - Power battery internal short circuit early warning method and device and vehicle - Google Patents
Power battery internal short circuit early warning method and device and vehicle Download PDFInfo
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Abstract
The disclosure relates to a power battery internal short circuit early warning method, a device and a vehicle, and solves the technical problem that a power battery internal short circuit judgment result is unreliable in the related art. The method comprises the following steps: acquiring voltage values of all single batteries in the power battery and state parameters of the state of charge of the power battery in the constant current charging process under the state that the power battery of the vehicle is in the constant current charging process; calculating the voltage value median and the average temperature value median of each series of single batteries aiming at each charging process; determining a target interval corresponding to the acquired state parameters according to a plurality of preset intervals corresponding to the state parameters of the power battery; determining standard scores of the median of the current voltage value according to the median of the battery voltage value, and storing the standard scores in association with a target interval; and comparing the change rate of the standard score of the median of the voltage values of the single batteries determined at the time with a pre-calibrated risk threshold value, and notifying the internal short circuit condition of the power battery according to the comparison result.
Description
Technical Field
The disclosure relates to the technical field of internet of vehicles big data analysis and power batteries, in particular to a power battery internal short circuit early warning method and device and a vehicle.
Background
With the importance of new energy technology, new energy automobiles are rapidly developed, and new energy automobile safety accidents are also attracting wide attention, and one of the main characteristics of the new energy automobiles in causing the new energy automobiles to generate safety accidents is that a power battery of the new energy automobiles generates thermal runaway, and the internal short circuit of the power battery is one of important reasons for the power battery to generate thermal runaway.
In the related art, a voltage drop and temperature rise method is mainly adopted, or a method for calculating a short circuit resistance according to real-time voltage and current is adopted to early warn the internal short circuit of the power battery. However, the voltage drop and temperature rise methods have the technical problems that the detection time is long, and whether the internal short circuit occurs in the power battery cannot be accurately judged under the condition of load current interference; the method for calculating the short-circuit resistance according to the real-time voltage and current depends on a battery management system, and the feasibility of realizing operation at the cloud is not enough.
Disclosure of Invention
The invention aims to provide a power battery internal short circuit early warning method, a device and a vehicle, which solve the technical problems that the power battery internal short circuit judgment result is unreliable and the dependence on a battery management system is strong in the related art.
To achieve the above object, according to a first aspect of embodiments of the present disclosure, the present disclosure provides a power battery internal short-circuit warning method, the method including:
Under the state that a power battery of a vehicle is in constant current charging, acquiring voltage values of all single batteries in the power battery and state parameters of the voltage values corresponding to the charge state of the power battery in the constant current charging process, wherein the state parameters comprise the following subparameters: the current state of health value, charging current and temperature value of the power battery, the state of charge is a plurality of interval values of interval [0%,100% ];
for each single charging process, calculating the median of the voltage value and the median of each series of average temperature values of each single battery according to the preset interval corresponding to the state of charge;
for the obtained median of the voltage value and the state parameter of each single battery, the following operations are performed:
according to a plurality of preset intervals corresponding to the state parameters of the power battery, determining a target interval corresponding to the state parameters acquired at this time;
determining a standard score of the median of the voltage value of each single battery according to the median of the voltage value of each single battery in the power battery, and storing the target interval in association with the standard score;
and comparing the change rate of the standard score of the median of the voltage values of the single batteries determined at the time with a pre-calibrated risk threshold for the target interval determined at the time, and notifying the short circuit condition in the power battery according to the comparison result.
Optionally, the method further comprises:
and under the condition that the number of the change rates of the standard scores stored in association with the target interval reaches a preset first number threshold for the first time, determining an initial risk threshold according to the change rate of the standard scores reaching the first number threshold.
Optionally, the method further comprises:
and updating the risk threshold according to the change rate of the standard score stored in association with each single battery and each target interval and the change rate of the standard score of the median of the voltage values of the power batteries of the same type as the power batteries before faults occur.
Optionally, the notifying the internal short circuit condition of the power battery according to the comparison result includes:
storing the comparison result of each time; and notifying the internal short circuit condition of the power battery according to the multiple comparison results of the single batteries.
Optionally, the storing the target interval in association with the standard score includes:
calculating the standard fraction change rate of the median of the voltage values of the single batteries determined at the time;
and correlating the standard score, the change rate and the target interval which are determined at the time.
Optionally, the determining, according to a plurality of preset intervals corresponding to the state parameters of the power battery, the target interval corresponding to the state parameters acquired this time includes:
for each sub-parameter, determining a first interval corresponding to the sub-parameter from a plurality of preset intervals of the sub-parameter;
when the first interval corresponding to each sub-parameter is obtained, intersection is obtained for each first interval, and the target interval corresponding to the state parameter is obtained.
Optionally, the risk threshold includes a plurality of risk thresholds, and the notifying the internal short circuit condition of the power battery according to the comparison result includes:
and under the condition that the change rate is larger than any risk threshold, outputting early warning information for notifying the power battery that the internal short circuit exists, wherein the early warning information comprises the risk level of the internal short circuit of the power battery corresponding to the risk threshold.
Optionally, the method further comprises:
when the voltage value of each single battery in the power battery and the state parameter of the state of charge of the power battery corresponding to the voltage value in the constant current charging process are obtained, the serial number of each single battery of the power battery is obtained;
And notifying the internal short circuit condition of the power battery according to the comparison result, wherein the method comprises the following steps:
under the condition that the change rate is larger than the risk threshold, determining the number of the single battery corresponding to the change rate;
and outputting early warning information for informing the power battery of the internal short circuit condition, wherein the early warning information comprises the serial number of the single battery.
According to a second aspect of embodiments of the present disclosure, the present disclosure provides an internal short-circuit warning device for a power battery, the device including:
the acquisition module is configured to acquire voltage values of all the single batteries in the power battery and state parameters of the state of charge of the power battery in a constant current charging process when the power battery of the vehicle is in a constant current charging state, wherein the state parameters comprise the following subparameters: the current state of health value, charging current and temperature value of the power battery, the state of charge is a plurality of interval values of interval [0%,100% ];
the execution module is configured to calculate the voltage value median and the average temperature value median of each series of single batteries according to the preset interval corresponding to the charge state for each charging process;
A processing module configured to perform the following operations for the obtained median of the voltage values and status parameters of each of the unit cells:
according to a plurality of preset intervals corresponding to the state parameters of the power battery, determining a target interval corresponding to the state parameters acquired at this time;
determining the standard score of the single battery according to the median of the voltage values of the single batteries in the power battery, and storing the target interval and the standard score in an associated manner;
the early warning module is configured to compare the change rate of the standard score of the median of the voltage values of the single batteries determined at this time with a pre-calibrated risk threshold value for the target interval determined at this time, and notify the power battery of the internal short circuit condition according to the comparison result.
According to a third aspect of the disclosed embodiments, the present disclosure provides a readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the power cell internal short warning method described above.
According to a fourth aspect of embodiments of the present disclosure, the present disclosure provides an electronic device, the electronic device comprising:
A memory having a computer program stored thereon;
and the processor is used for executing the computer program in the memory to realize the steps of the power battery internal short circuit early warning method.
According to a fifth aspect of embodiments of the present disclosure, there is provided a vehicle including the power cell internal short-circuit warning device of the second aspect.
Through the above technical scheme, the technical scheme provided by the embodiment of the disclosure can include the following beneficial effects: the method has the advantages that the requirements on detection and data sampling conditions are low, the interference of external factors is reduced, when the internal short circuit occurs in the power battery, the early warning can be quickly and accurately performed, the early warning accuracy is improved, the limitation of a current management system is avoided, and the operation can be realized at the cloud.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a flow chart illustrating a method of early warning of a short circuit within a power cell, according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating a method of calibrating risk thresholds in a power cell internal short warning method according to an exemplary embodiment;
FIG. 3 is another flow chart illustrating a method of early warning of a short circuit within a power cell, according to an exemplary embodiment;
FIG. 4 is a block diagram illustrating an in-battery short warning device according to an exemplary embodiment;
fig. 5 is a block diagram of an electronic device, according to an example embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure.
It should be noted that, in this disclosure, the terms "S101", "S102", and the like in the specification and claims and in the drawings are used for distinguishing between steps and not necessarily for performing the method steps in a particular order or sequence.
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Fig. 1 is a flowchart illustrating a method of early warning of a short circuit in a power battery according to an exemplary embodiment, and the method may include the following steps as shown in fig. 1.
In step S101, in a state where a power battery of a vehicle is in constant current charging, a voltage value of each unit cell in the power battery and a state parameter of each voltage value corresponding to a state of charge of the power battery in the constant current charging process are obtained, where the state parameter includes the following sub-parameters: the current state of health value, charging current and temperature value of the power battery, the state of charge is a plurality of interval values of interval [0%,100% ].
In step S102, for each charging process, calculating a median of the voltage value and a median of each series of average temperature values of each single battery according to a preset interval of the corresponding state of charge;
in step S103, the following operations are performed for the median of the obtained voltage values and the state parameters of each unit cell:
determining a target interval corresponding to the acquired state parameters according to a plurality of preset intervals corresponding to the state parameters of the power battery;
and determining a standard score of the median of the voltage value of each single battery according to the median of the voltage value of each single battery in the obtained power battery, and storing the target interval and the standard score in an associated manner.
In step S104, the change rate of the standard score of the median of the voltage values of the single batteries determined at this time is compared with a risk threshold value calibrated in advance for the target interval determined at this time, and the power battery internal short circuit condition is notified according to the comparison result.
For example, in step S102, for each charging process, the median of the voltage value and the median of each series of average temperature values of each single battery are calculated according to the preset interval of the corresponding state of charge (divided according to the marking parameters such as the battery type), see the following table:
further, in step S103, taking selecting 50 single batteries of each set of battery of a certain type of battery system as an example, selecting a power battery of a vehicle in a state of constant current charging, determining preset intervals of each state of charge to obtain a median of voltage values of each single battery in the power battery, and specifically referring to the following table:
further, in step S103, determining a standard score of the median of the current voltage value of the battery cell according to the median of the voltage values of the battery cells in the obtained power battery cell may include:
respectively bringing the median of the obtained voltage values of the single batteries of the power battery into a calculation formula to obtain the standard score of the median of the voltage values of the single batteries;
The calculation formula is as follows: z= (X-X ')/sigma, wherein Z represents the standard fraction of the median of the voltage value of the single battery, X represents the median of the voltage value of the single battery, X' represents the median or median of the voltage average value of all the single batteries in the power battery where the single battery is located at the same time, and sigma represents the standard deviation of the median of the voltage value of all the single batteries in the power battery set.
Taking 50 single batteries of each set of battery of a certain type of battery system as an example, the standard score of the median of the voltage values of the single batteries stored in a target interval in an associated manner is shown in the following table:
since the power battery of the vehicle is in a constant current charging state, the voltage values and the temperature values acquired in the target interval belong to a plurality of series, and in the present disclosure, calculation is performed by a series of voltage values and temperature values, the median of the voltage values of each unit battery acquired in the target interval and the median of the average values of the temperatures of each series are required to be calculated first.
Each sub-parameter in the state parameter corresponds to a plurality of preset intervals, and the corresponding relation of the sub-parameters can be preset according to the state of the actual power battery, which is not particularly limited in the disclosure.
For example, at r specific SOC values for which the state of charge is the interval [0%,100% ], the state parameters include: when the current state of health value SOH, charging current I, battery temperature average value T of the power battery, the obtained SOH is averaged to obtain n SOH in the range of normal SOH interval [80%,100% ], and the corresponding SOH points are as follows: SOH1, SOH2, SOH3, & gt, SOHn, divided into n+1 intervals; taking k I from the obtained I in the range of normal charging current [ Imin, imax ] in average, wherein the corresponding I points are as follows: i1 I2, I3..ik, divided into k+1 intervals; and taking m T values in the range of normal temperature intervals [ Tmin, tmax ] on average, wherein the corresponding T points are T1, T2 and T3, & gt, and Tm are divided into m+1 intervals.
According to the method and the device, the obtained voltage value of each single battery in the power battery and the state parameter of each voltage value corresponding to the state of charge of the power battery in the constant-current charging process are used for calculating the voltage value median of each single battery and the median of each series of average temperature values according to the preset interval corresponding to the state of charge in each charging process, determining the target interval corresponding to the obtained state parameter, determining the standard score of the single battery according to the median of the obtained voltage value of each single battery in the power battery, storing the target interval in association with the standard score, comparing the change rate of the standard score of the median of the voltage value of each single battery determined for the determined target interval with the preset risk threshold, early warning the single battery with the internal short circuit of the power battery according to the comparison result, reducing the interference of short-time variables on the early warning result, improving the accuracy and the reliability of the early warning result, and being free from the limitation of a current management system, and being capable of realizing early warning operation.
When acquiring the state parameters, the marking parameters in the power battery need to be acquired, and the marking parameters can comprise the following sub-parameters: the vehicle type, the battery type, a short-circuit fault flag in the power battery, a power battery system number, and a current time at which the status parameter is obtained.
The initial risk threshold value determined by a certain number of change rates can be used for judging the internal short circuit condition of the power battery, and the judging result is reliable.
In an embodiment, the method for early warning of short circuit in a power battery further includes:
and determining an initial risk threshold according to the change rate of the standard score reaching the first quantity threshold under the condition that the quantity of the change rate of the standard score stored in association with the target interval reaches the preset first quantity threshold for the first time.
The first number of thresholds may be preset according to the early warning requirement of the power battery, which is not specifically limited in the present disclosure.
Referring to fig. 2, in step S201, in a state where a power battery of a vehicle is in constant current charging, voltage values of each unit cell in the power battery and state parameters of each voltage value corresponding to a state of charge of the power battery in the constant current charging process are obtained, where the state parameters include the following sub-parameters: the current state of health value, charging current and temperature value of the power battery, the state of charge is a plurality of interval values of interval [0%,100% ].
In step S202, for each charging process, the median of the voltage value and the median of each series of average temperature values of each unit cell are calculated according to the preset interval of the corresponding state of charge.
In step S203, the following operations are performed for the acquired median of the voltage values and the state parameters of each unit cell:
determining a target interval corresponding to the acquired state parameters according to a plurality of preset intervals corresponding to the state parameters of the power battery; and determining the standard score of the single battery according to the median of the obtained voltage values of the single batteries in the power battery, and storing the target interval and the standard score in an associated manner.
In step S204, it is determined whether the number of change rates of the standard components stored in association with the target section reaches a preset first number threshold for the first time.
In step S205, in the case where the number of the change rates of the criterion scores stored in association with the target section reaches the preset first number threshold for the first time, an initial risk threshold is determined from the change rate of the criterion score reaching the first number threshold. Otherwise, the process returns to step S202.
For example, in the case where the number of change rates of standard components stored in the target section reaches 100 for the first time, an initial risk threshold is determined from the change rates of the 100 standard components by a mathematical analysis method.
Taking 50 single batteries of each battery set of a certain type of battery system as an example, the change rate of the standard components is obtained, and the following table is referred to:
in the case where the rate of change in the above table reaches a certain number of thresholds, such as where the number of rates of change reaches more than 100 for the first time, the initial risk threshold may be determined by analyzing the more than 100 rates of change using a mathematical analysis method.
The mathematical analysis method in the present embodiment may be an analysis method describing statistics, hypothesis testing, analysis of variance, and the like, which is not particularly limited in the present disclosure.
The standard score of each single battery relative to other single batteries of the power battery pack in the target state can be rapidly determined by counting the discrete distribution condition of the median of the voltage values of each single battery, the standard score is obtained in a simple mode, the related data of the obtained standard score are stable, interference factors are few, and the reliability of an early warning result obtained according to the standard score is high.
With the increase of the number of standard scores stored in the target interval, the initial risk threshold value needs to be updated, so that the subsequent internal short-circuit early warning result of the power battery is accurate and reliable.
In an embodiment, the method for early warning of short circuit in a power battery further includes:
And updating the risk threshold according to the change rate of the standard score stored in association with each single battery and each target interval and the change rate of the standard score of the median of the voltage values of the power batteries of the same type as the power battery before the power battery breaks down.
For example, a mathematical analysis method is adopted to update the risk threshold according to the change rate of the standard score stored in the target interval and the obtained change rate of the standard score of the median of the voltage value before the power battery of the same type as the power battery fails.
The process for obtaining the standard fraction of the median of the voltage values before the faults of the power batteries of the same type comprises the following steps: the change rate of the standard component of the median of the voltage value of the battery with internal short circuit fault before fault in the actual running process of the vehicle, or the change rate of the standard component of the median of the voltage value of the power battery with internal short circuit problem is confirmed after the battery with internal short circuit risk is detected through data analysis. And when the two types of data are accumulated to a certain quantity, counting the standard component change rate according to a certain time before the fault, and then, re-calibrating the risk threshold by using a mathematical analysis method.
The risk threshold is recalibrated according to the change rate of the standard score stored in the target interval and the change rate of the standard score of the median voltage value of different stages before the fault unit battery in the power battery occurs, so that the automatic updating of the risk threshold is realized, the battery type, the material and the like are automatically identified, the internal short circuit condition of different power batteries can be notified, and the universality is wide; and the risk threshold is recalibrated according to the change rate of the standard score, so that the comparability and the accuracy of the data sets are improved, and the method is simple and convenient.
The standard score corresponding to the target section of the power battery and the change rate of the standard score are involved in determining the initial risk threshold, so that the standard score, the change rate of the standard score and the target section need to be associated.
In one embodiment, in step S103, storing the target interval in association with the standard score includes:
calculating the standard fraction change rate of the voltage value median of each single battery determined at the present time;
and correlating the standard score, the change rate and the target interval determined at the time.
And determining a target interval according to the state parameters of the power batteries so as to obtain the standard division change rate of the power batteries of the same type in the same interval, thereby carrying out early warning on the internal short circuit condition of the power batteries.
In an embodiment, in step S103, determining the target interval corresponding to the acquired state parameter according to the preset intervals corresponding to the state parameter of the power battery may include:
for each sub-parameter, determining a first interval corresponding to the sub-parameter from a plurality of preset intervals of the sub-parameter;
when the first interval corresponding to each sub-parameter is obtained, intersection is obtained for each first interval, and the target interval corresponding to the state parameter is obtained.
For example, in the charge state interval [0%,100 ]]The state parameters include the following sub-parameters: when the current state of health value SOH, charging current I and temperature value of the power battery are respectively carried out, the obtained SOH is respectively in the normal SOH interval (80%, 100%)]N SOHs are averaged over the range of (a), and the corresponding SOH points are: SOH1, SOH2, SOH3, & gt, SOHn, divided into n+1 intervals; ,SOCr is divided into r+1 intervals; the obtained T value is within a normal temperature interval [ Tmin, tmax ]]M T are averaged over the range of (1), the corresponding T points are T1, T2, T3,..tm, divided into m+1 intervals, the SOC points corresponding to r specific SOC values are: SOC1, SOC2, SOC3, …. In a state that a power battery of a vehicle is charged in a constant current manner, for each SOC point, firstly, according to a first interval SOC corresponding to the SOC point 1 Calculating the median of the voltage value of each single battery and the median T of each series of average temperature values, and respectively determining a first interval SOH of the power battery corresponding to the SOH of each single battery average voltage at a certain moment according to the preset corresponding relation among the sub-parameters 1 A first section C corresponding to the charging rate obtained according to the charging current I 3 The method comprises the steps of carrying out a first treatment on the surface of the First interval T corresponding to T 6 The method comprises the steps of carrying out a first treatment on the surface of the Taking four first intervals SOH 1 、SOC 1 、C 3 、T 6 And (3) obtaining a target interval corresponding to the charge state of each single voltage of the power battery in the constant current charging process of the power battery.
See the following table:
and by extracting the state parameters of the voltage, the interference of other influencing factors on the median of the voltage value of the power battery is reduced. According to the corresponding relation among various sub-parameters, the target interval corresponding to the voltage of the power battery is subdivided, the similar working condition data are normalized, risks are effectively identified, and the reliability and the accuracy of the early warning result are ensured.
In an embodiment, the risk threshold includes a plurality of risk thresholds, and in step S104, notifying the power battery of the short circuit condition according to the comparison result may include:
and under the condition that the change rate of the standard score is larger than any risk threshold, outputting early warning information for notifying the power battery that the internal short circuit exists, wherein the early warning information comprises the risk level of the internal short circuit of the power battery corresponding to the risk threshold.
Specifically, when the risk threshold includes a first comparison threshold, a second comparison threshold, and a third comparison threshold, the first comparison threshold corresponds to a first risk level, the second comparison threshold corresponds to a second risk level, and the third comparison threshold corresponds to a third risk level, wherein the first risk level is smaller than the second risk level, and the second risk level is smaller than the third risk level;
And outputting early warning information for notifying the power battery that the internal short circuit exists under the condition that the change rate of the standard score is larger than the first comparison threshold value and smaller than the second comparison threshold value, wherein the early warning information comprises a first risk level of the internal short circuit of the power battery corresponding to the first comparison threshold value.
And outputting early warning information for notifying the power battery that the internal short circuit exists under the condition that the change rate of the standard score is larger than the second comparison threshold value and smaller than the third comparison threshold value, wherein the early warning information comprises a second risk level of the internal short circuit of the power battery corresponding to the second comparison threshold value.
And outputting early warning information for notifying the power battery that the internal short circuit exists under the condition that the change rate of the standard score is larger than a third comparison threshold value, wherein the early warning information comprises a third risk level of the internal short circuit of the power battery corresponding to the third comparison threshold value.
And calculating the change rate of the standard score by the standard of the median of the newly acquired voltage values of the single batteries and the standard score of the median of the voltage values of the single batteries at the preset interval in the front of the same target interval of the same battery system, and comparing the risk threshold value to judge whether risks exist or not so as to confirm the corresponding risk grade and the serial number of the single battery corresponding to the risk grade.
For example, this type of cell, through preliminary analysis, is SOH (80%, 90%) at the target interval]&SOC[40％～，60％)&(0.5-0.7)C&The risk thresholds for [10 ℃,20 ℃) are respectively: f (f) 1 ＝3.0、f 2 ＝4.0、f 3 The number 4 cell of the newly obtained cells was calculated and determined to be the first risk level=5.0. See for details the following table:
and grouping batteries according to relevant marking parameters such as the type of the power battery and the like, analyzing and setting weights of different charging intervals according to an electrochemical mechanism, and obtaining the risk level of comprehensive assessment.
For example: after the early warning risk grades of different charged intervals in the current preset time range of the same set of power battery are rated, the risk grades of the set of power battery can be comprehensively evaluated according to the weights set in each interval. See the following table:
the power batteries of the same type are judged by setting a plurality of comparison thresholds, and the corresponding risk levels are associated for different comparison thresholds, so that different risk level reminders can be output, and a user can acquire the current risk level of the power battery of the vehicle in real time, and then the operation under the corresponding current risk level is executed.
In an embodiment, the method may further include:
when the voltage value of each single battery in the power battery and the state parameter of each voltage value corresponding to the charge state of the power battery in the constant current charging process are obtained, the serial number of each single battery of the power battery is obtained;
In step S104, notifying the internal condition of the power battery according to the comparison result, includes:
under the condition that the change rate is larger than the risk threshold value, determining the serial number of the single battery corresponding to the change rate;
and outputting early warning information for informing the power battery of the internal short circuit condition, wherein the early warning information comprises the serial number of the single battery.
For example, when the voltage value of each single battery of the power battery of the vehicle and the state parameter of the state of charge of the power battery corresponding to each voltage value in the constant current charging process are obtained, the serial numbers of each single battery of the power battery are obtained at the same time; determining the number of the single battery corresponding to the change rate under the condition that the change rate of the standard score of the median of the voltage values of the power battery of the vehicle is larger than the risk threshold; the serial numbers of the single batteries are output to remind workers of risk points of internal short circuit of the power batteries.
Through the serial number of the output monomer battery, the risk point that easily takes place or take place internal short circuit in the power battery is confirmed fast to the user to the accurate response operation to the monomer battery that easily takes place or take place internal short circuit.
Specifically, the early warning information further includes early warning voice or early warning sound effect, so that the early warning voice or early warning sound effect is played through the buzzer or voice equipment when the early warning information is output, so as to remind a user.
Specifically, the early warning information further comprises early warning indicator lamp control information, so that the early warning indicator lamp is controlled to be on or flash through the early warning indicator lamp control information when the early warning information is output, and a user is reminded.
For example, as shown in fig. 3, in step S301, in a state where the power battery of the vehicle is in constant current charging, a voltage value of the power battery of the vehicle, a state parameter of each voltage value corresponding to a state of charge of the power battery in the constant current charging process, and a number of each unit battery are obtained, where the state parameter includes the following sub-parameters: the current state of health value, charging current and temperature value of the power battery, this state of charge is a plurality of interval values of interval [0%,100% ];
in step S302, for each charging process, the median of the voltage value and the median of each series of average temperature values of each single battery are calculated according to the preset interval of the corresponding state of charge;
in step S303, the following operations are performed for the median of the obtained voltage values and the state parameters of each unit cell: determining a target interval corresponding to the acquired state parameters according to a plurality of preset intervals corresponding to the state parameters of the power battery; determining the standard score of the single battery according to the median of the obtained voltage values of the single batteries in the power battery, and storing the target interval and the standard score in an associated manner;
In step S304, for the target interval determined this time, it is determined whether the rate of change of the standard score of the median of the voltage values of the single batteries determined this time is greater than a risk threshold value calibrated in advance;
in step S305, when the change rate of the standard score of the median of the voltage values of the single batteries determined at this time is greater than the risk threshold value calibrated in advance, outputting the risk level of the internal short circuit of the power battery corresponding to the risk threshold value and the number of the single battery corresponding to the change rate of the standard score;
in step S306, the change rate of the standard score stored in association with each single battery and each target interval is obtained;
in step S307, the rate of change of the standard fraction of the median of the voltage value before failure of the power battery of the same type as the power battery is obtained;
in step S308, the risk threshold is recalibrated.
In step S309, when the rate of change of the standard score of the median of the voltage values of the individual battery determined this time is not greater than the risk threshold value calibrated in advance, the information that the power battery is not internally shorted is output.
The risk threshold is automatically updated by recalibrating the risk threshold, so that the internal short circuit condition of different power batteries can be notified, the influence of the battery type, the material and the connection mode is avoided, and the universality is wide; and the preset threshold value is recalibrated according to the change rate of the standard components, so that the comparability and the accuracy of the data sets are improved, and the method is simple and convenient.
Fig. 4 is a block diagram illustrating an in-battery short warning device according to an exemplary embodiment. As shown in fig. 4, the power battery internal short-circuit warning device 1300 includes an acquisition module 1301, an execution module 1302, a processing module 1303 and a warning module 1304.
The obtaining module 1301 is configured to obtain, when a power battery of a vehicle is in a state of constant current charging, a voltage value of each unit battery in the power battery and a state parameter of each voltage value corresponding to a state of charge in the constant current charging process of the power battery, where the state parameter includes the following sub-parameters: the current state of health value, charging current and temperature value of the power battery, the state of charge is a plurality of interval values of interval [0%,100% ].
The execution module 1302 is configured to calculate, for each charging process, a median of voltage values and a median of average temperature values per series for each cell according to a preset interval of the corresponding state of charge.
The processing module 1303 is configured to perform the following operations for each acquired state parameter and the median of the voltage values of the unit cells of the power battery:
determining a target interval corresponding to the acquired state parameters according to a plurality of preset intervals corresponding to the state parameters of the power battery;
And determining the standard score of the single battery according to the obtained median of the voltage values of the single batteries in the power battery, and storing the target interval and the standard score in an associated manner.
The early warning module 1304 is configured to compare, for a target interval determined at this time, a change rate of a standard score of a median of voltage values of each single battery determined at this time with a risk value calibrated in advance, and notify a short circuit condition in the power battery according to a comparison result.
According to the method, voltage values of all single batteries in the power battery and state parameters of the state of charge of the power battery in a constant current charging process are obtained when the power battery of the vehicle is in a constant current charging state, and voltage value median of each single battery and average temperature value median of each series are calculated according to a preset interval of the state of charge of the corresponding state parameters in each charging process; the method comprises the steps of determining a target interval corresponding to the acquired state parameter, determining the standard score of the single battery according to the median of the voltage value of each single battery in the acquired power battery, storing the target interval and the standard score in an associated mode, comparing the change rate of the standard score of the median of the voltage value of each single battery determined at the time with a pre-calibrated risk threshold value according to the determined target interval, and early warning the single battery with internal short circuit according to a comparison result, wherein the requirements on detection and sampling conditions of related parameters are low, the interference of short-time variables on the early warning result is reduced, the accuracy and the reliability of the early warning result are improved, the limitation of a current management system is avoided, and the operation can be realized in a cloud.
Optionally, the power battery internal short-circuit warning device 1300 further includes a calibration module configured to determine an initial risk threshold according to the rate of change of the standard score reaching a first number threshold, where the first number threshold is a number of the rate of change of the standard score stored in association with the target interval reaching a preset value for the first time.
Optionally, the calibration module is further configured to update the risk threshold according to a rate of change of a standard score stored in association with each single battery and each target interval, and a rate of change of a standard score of a median voltage value of the power battery of the same type as the power battery before the power battery fails.
Optionally, the pre-warning module 1304 is configured to store the comparison result for each time; and notifying the short circuit condition in the power battery according to the multiple comparison results of the single batteries.
Optionally, the execution module 1302 is configured to calculate a rate of change of a standard fraction of the median of the voltage values of the cells determined at the time;
and correlating the standard score, the change rate and the target interval determined at the time.
Optionally, the execution module 1302 is configured to determine, for each sub-parameter, a first interval corresponding to the sub-parameter from a plurality of preset intervals of the sub-parameter;
When the first interval corresponding to each sub-parameter is obtained, intersection is obtained for each first interval, and the target interval corresponding to the state parameter is obtained.
Optionally, the early warning module 1304 is configured to output early warning information for notifying that the power battery has an internal short circuit condition if the rate of change is greater than any risk threshold, where the early warning information includes a risk level of the internal short circuit of the power battery corresponding to the risk threshold, and the threshold includes a plurality of thresholds.
Optionally, the obtaining module 1301 is configured to obtain the number of each unit cell of the power battery when obtaining the voltage value of each unit cell in the power battery and the state parameter of each voltage value corresponding to the state of charge of the power battery in the constant current charging process;
the early warning module 1304 is configured to determine a number of the single battery corresponding to the change rate if the change rate is greater than the risk threshold;
and outputting early warning information for informing the power battery of the internal short circuit condition, wherein the early warning information comprises the serial number of the single battery.
It should be noted that, for convenience and brevity, the embodiments described in the specification are all preferred embodiments, and the related parts are not necessarily essential to the present invention, for example, the acquisition module and the execution module may be separate devices or the same device when implemented, which is not limited by the present disclosure.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
The present disclosure also provides a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the power cell internal short warning method provided by the present disclosure.
In particular, the computer readable storage medium may be flash memory, a hard disk, a multimedia card, a card memory (e.g., SD or DX memory, etc.), random Access Memory (RAM), static Random Access Memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, optical disk, server, public cloud server, etc.
Regarding the computer-readable storage medium in the above-described embodiments, the steps of the method for implementing the in-power-battery short-circuit prevention method when the computer program stored thereon is executed have been described in detail in the embodiments regarding the method, and will not be described in detail herein.
The present disclosure also provides an electronic device including:
A memory having a computer program stored thereon;
and the processor is used for executing the computer program in the memory to realize the steps of the power battery internal short circuit early warning method.
According to the method, voltage values of all single batteries in the power battery and state parameters of the state of charge of the power battery in a constant current charging process are obtained when the power battery of the vehicle is in a constant current charging state, and voltage value median of each single battery and average temperature value median of each series are calculated according to a preset interval of the state of charge of the corresponding state parameters in each charging process; determining a target interval corresponding to the acquired state parameter, determining the standard score of the single battery according to the median of the voltage value of each single battery in the acquired power battery, storing the target interval and the standard score in an associated mode, comparing the change rate of the standard score of the median of the voltage value of each single battery determined for the determined target interval with a pre-calibrated risk threshold value, carrying out early warning according to a comparison result, and reducing the interference of short-time variables on the early warning result, realizing big data analysis and application, and realizing operation on a cloud, thereby improving the accuracy and reliability of the early warning result.
Fig. 5 is a block diagram of an electronic device 700, according to an example embodiment. As shown in fig. 5, the electronic device 700 may include: a processor 701, a memory 702. The electronic device 700 may also include one or more of a multimedia component 703, an input/output (I/O) interface 704, and a communication component 705.
The processor 701 is configured to control the overall operation of the electronic device 700, so as to complete all or part of the steps in the method for early warning of short circuit in a power battery. The memory 702 is used to store various types of data to support operation on the electronic device 700, which may include, for example, instructions for any application or method operating on the electronic device 700, as well as application-related data, such as voltage values for each cell in the power battery, and current state of health values, state of charge, charge current, temperature values, etc., of the power battery for each voltage value.
The Memory 702 may be implemented by any type or combination of volatile or non-volatile Memory devices, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk, or optical disk.
The multimedia component 703 can include a screen and an audio component. Wherein the screen may be, for example, a touch screen, the audio component being for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in the memory 702 or transmitted through the communication component 705. The audio assembly further comprises at least one speaker for outputting audio signals.
The I/O interface 704 provides an interface between the processor 701 and other interface modules, which may be a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons.
The communication component 705 is for wired or wireless communication between the electronic device 700 and other devices. Wireless communications, such as Wi-Fi, bluetooth, near field communications (Near Field Communication, NFC for short), 2G, 3G, 4G or 5G, nb-IOT (Narrow Band Internet of Things ), or a combination of one or more thereof, the respective communication component 705 may thus comprise: wi-Fi module, bluetooth module, NFC module.
In an exemplary embodiment, the electronic device 700 may be implemented by one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASIC), digital signal processor (Digital Signal Processor, abbreviated as DSP), digital signal processing device (Digital Signal Processing Device, abbreviated as DSPD), programmable logic device (Programmable Logic Device, abbreviated as PLD), field programmable gate array (Field Programmable Gate Array, abbreviated as FPGA), controller, microcontroller, microprocessor, or other electronic components for performing the power cell internal short circuit warning method described above.
In another exemplary embodiment, a computer program product is also provided, comprising a computer program executable by a programmable apparatus, the computer program having code portions for performing the power cell internal short warning method described above when executed by the programmable apparatus.
The disclosure also provides a vehicle comprising the power battery internal short-circuit early-warning device.
According to the method, voltage values of all single batteries in the power battery and state parameters of the state of charge of the power battery in a constant current charging process are obtained when the power battery of the vehicle is in a constant current charging state, and voltage value median of each single battery and average temperature value median of each series are calculated according to a preset interval of the state of charge of the corresponding state parameters in each charging process; the method comprises the steps of determining a target interval corresponding to the acquired state parameter, determining the standard score of the single battery according to the median of the voltage value of each single battery in the acquired power battery, storing the target interval and the standard score in an associated mode, comparing the change rate of the standard score of the median of the voltage value of each single battery determined at the time with a pre-calibrated risk threshold value according to the determined target interval, and early warning the single battery with internal short circuit according to a comparison result, wherein the requirements on detection and sampling conditions of related parameters are low, the interference of short-time variables on the early warning result is reduced, the accuracy and the reliability of the early warning result are improved, the limitation of a current management system is avoided, and the operation can be realized in a cloud.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (10)
1. An early warning method for internal short circuit of a power battery is characterized by comprising the following steps:
under the state that a power battery of a vehicle is in constant current charging, acquiring voltage values of all single batteries in the power battery and state parameters of the voltage values corresponding to the charge state of the power battery in the constant current charging process, wherein the state parameters comprise the following subparameters: the current state of health value, charging current and temperature value of the power battery, the state of charge is a plurality of interval values of interval [0%,100% ];
For each charging process, calculating the voltage value median and each series of average temperature value median of each single battery according to a preset interval corresponding to the state of charge;
for the obtained median of the voltage value and the state parameter of each single battery, the following operations are performed:
according to a plurality of preset intervals corresponding to the state parameters of the power battery, determining a target interval corresponding to the state parameters acquired at this time;
determining a standard score of the median of the voltage value of each single battery according to the median of the voltage value of each single battery in the power battery, and storing the target interval in association with the standard score;
and comparing the change rate of the standard score of the median of the voltage values of the single batteries determined at the time with a pre-calibrated risk threshold for the target interval determined at the time, and notifying the short circuit condition in the power battery according to the comparison result.
2. The method according to claim 1, wherein the method further comprises:
and under the condition that the number of the change rates of the standard scores stored in association with the target interval reaches a preset first number threshold for the first time, determining an initial risk threshold according to the change rate of the standard scores reaching the first number threshold.
3. The method according to claim 1, wherein the method further comprises:
and updating the risk threshold according to the change rate of the standard score stored in association with each single battery and each target interval and the change rate of the standard score of the median voltage value of the power batteries of the same type as the power batteries before faults occur.
4. A method according to any one of claims 1-3, wherein said notifying of the power cell internal short circuit condition based on the comparison result comprises:
storing the comparison result of each time; and notifying the internal short circuit condition of the power battery according to the multiple comparison results of the single batteries.
5. A method according to any one of claims 1-3, wherein said storing said target interval in association with said standard deviation comprises:
calculating the standard fraction change rate of the median of the voltage values of the single batteries determined at the time;
and correlating the standard score, the change rate and the target interval which are determined at the time.
6. The method according to claim 1, wherein the determining the target interval corresponding to the acquired state parameter according to the preset intervals corresponding to the state parameter of the power battery includes:
For each sub-parameter, determining a first interval corresponding to the sub-parameter from a plurality of preset intervals of the sub-parameter;
when the first interval corresponding to each sub-parameter is obtained, intersection is obtained for each first interval, and the target interval corresponding to the state parameter is obtained.
7. The method of claim 1, wherein the risk threshold comprises a plurality of, and wherein notifying the power cell internal short circuit condition based on the comparison result comprises:
and under the condition that the change rate is larger than any risk threshold, outputting early warning information for notifying the power battery that the internal short circuit exists, wherein the early warning information comprises the risk level of the internal short circuit of the power battery corresponding to the risk threshold.
8. The method according to claim 1, wherein the method further comprises:
acquiring the number of each single battery of the power battery when the voltage value median of each single battery in the power battery and the state parameter of the power battery corresponding to the state of charge in the constant current charging process are acquired;
and notifying the internal short circuit condition of the power battery according to the comparison result, wherein the method comprises the following steps:
Under the condition that the change rate is larger than the risk threshold, determining the number of the single battery corresponding to the change rate;
and outputting early warning information for informing the power battery of the internal short circuit condition, wherein the early warning information comprises the serial number of the single battery.
9. An internal short circuit warning device for a power battery, comprising:
the acquisition module is configured to acquire voltage values of all the single batteries in the power battery and state parameters of the state of charge of the power battery in a constant current charging process when the power battery of the vehicle is in a constant current charging state, wherein the state parameters comprise the following subparameters: the current state of health value, charging current and temperature value of the power battery, the state of charge is a plurality of interval values of interval [0%,100% ];
the execution module is configured to calculate the voltage value median and the average temperature value median of each series of single batteries according to the preset interval corresponding to the charge state for each charging process;
a processing module configured to perform the following operations for the obtained median of the voltage values and status parameters of each of the unit cells:
The median of the voltage value determines a target interval corresponding to the acquired state parameter according to a plurality of preset intervals corresponding to the state parameter of the power battery;
determining the standard score of the single battery according to the median of the voltage values of the single batteries in the power battery, and storing the target interval and the standard score in an associated manner;
the early warning module is configured to compare the change rate of the standard score of the median of the voltage values of the single batteries determined at this time with a pre-calibrated risk threshold value for the target interval determined at this time, and notify the power battery of the internal short circuit condition according to the comparison result.
10. A vehicle comprising the power cell internal short-circuit warning device according to claim 9.
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