CN118671603B - A method and system for detecting safety performance of lithium deposition in lithium-ion batteries - Google Patents
A method and system for detecting safety performance of lithium deposition in lithium-ion batteries Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
本发明公开了一种锂离子电池析锂安全性能检测方法及系统，涉及电池检测领域，首先采集电池的输出功率和输出电压，构建相应的模板并进行相互关联。通过对输出功率模板进行特征降维和等同性比对，提取出具有代表性的参考输出功率模板。然后，将实时采集的电池输出功率与参考模板进行比对，确定相符的参考输出电压模板。最后，基于参考输出电压模板对实时输出电压进行比对，根据电压差异特征判断电池是否存在析锂现象。本发明通过上述技术方案实现了对锂离子电池析锂情况的高效、准确、实时检测，提升了电池的安全性能。
The present invention discloses a lithium-ion battery lithium plating safety performance detection method and system, which relates to the field of battery detection. First, the output power and output voltage of the battery are collected, and corresponding templates are constructed and correlated. By performing feature dimension reduction and equivalence comparison on the output power template, a representative reference output power template is extracted. Then, the real-time collected battery output power is compared with the reference template to determine a matching reference output voltage template. Finally, the real-time output voltage is compared based on the reference output voltage template, and it is determined whether the battery has lithium plating according to the voltage difference characteristics. The present invention realizes efficient, accurate and real-time detection of lithium plating in lithium-ion batteries through the above technical scheme, thereby improving the safety performance of the battery.
Description
Technical Field
The invention relates to the technical field of battery detection, in particular to a method and a system for detecting the lithium separation safety performance of a lithium ion battery.
Background
Lithium ion batteries are widely used in various fields such as electric automobiles, energy storage systems, consumer electronics and the like in recent years due to the advantages of high voltage, high energy density, no memory effect and the like. However, as lithium ion batteries are popularized, the safety problem is also becoming more and more prominent, wherein the phenomenon of lithium precipitation is one of the key factors that lead to the degradation of battery performance and even the initiation of safety problems.
The lithium precipitation phenomenon mainly occurs during the battery charging process, especially under the condition of fast charging or low-temperature charging. When the potential of the graphite cathode is lower than that of lithium, lithium ions are accumulated on the surface of the cathode and cannot be timely intercalated, so that lithium metal deposition, namely lithium precipitation, is formed. The lithium can be separated out to lead to the rapid decay of battery capacity and shorten the service life, and the lithium metal separated out can puncture the battery diaphragm to cause the battery short circuit, and then serious safety problems such as overheat, fire and explosion are generated.
Therefore, how to timely and accurately detect the lithium precipitation condition of the lithium ion battery and evaluate the safety performance of the lithium ion battery becomes a technical problem to be solved urgently by lithium ion battery manufacturers and researchers. The traditional lithium separation detection method mostly relies on dismantling the battery for internal observation, which not only has complex operation and low efficiency, but also can not monitor the lithium separation condition of the battery in real time.
Disclosure of Invention
The invention aims to provide a lithium ion battery lithium-precipitation safety performance detection method and system capable of timely finding out the lithium-precipitation condition of a lithium ion battery.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a lithium ion battery lithium separation safety performance detection method comprises the following steps:
Collecting output power and output voltage of a battery, constructing an output power template of the battery based on the collected output power, constructing an output voltage template of the battery based on the collected output voltage, and correlating the output power template and the output voltage template in a mode corresponding to the same time;
Performing feature dimension reduction on the output power templates, determining template feature data corresponding to the output power templates, and classifying the output power templates with the template feature data being consistent once to obtain a plurality of first output power template groups;
Performing equivalence comparison on the output power templates in each first output power template group, and performing secondary classification on the output power templates meeting the equivalence requirements based on a preset equivalence identification standard to obtain a second output power template group;
Averaging the output power templates in the second output power template group to obtain an average output power template, determining the referenceable degree of the average output power template based on the number of the output power templates in the second output power template group, and if the referenceable degree is greater than or equal to a preset value, determining the average output power template as a reference output power template;
Comparing the real-time output power of the battery acquired in real time with different reference output power templates, determining a conforming reference output power template, and recognizing an output voltage template corresponding to the reference output power template as a reference output voltage template;
And comparing the real-time output voltage of the battery acquired in real time based on the reference output voltage template, and determining whether lithium is separated from the battery based on the voltage difference characteristic.
In some embodiments of the present disclosure, a method of constructing an output power template includes:
constructing an output power coordinate system by taking time as a transverse coordinate and output power as an ordinate, configuring power coordinate points in the output power coordinate system based on the acquired output power, smoothly connecting the power coordinate points according to the progress direction of a time axis to obtain an output power curve, and marking the output power curve as an output power template;
The method for constructing the output voltage template comprises the following steps:
And constructing an output voltage coordinate system by taking time as a transverse coordinate and output voltage as an ordinate, configuring voltage coordinate points in the output voltage coordinate system based on the acquired output voltage, smoothly connecting the voltage coordinate points according to the advancing direction of a time axis to obtain an output voltage curve, and recording the output voltage curve as an output voltage template.
In some embodiments of the present disclosure, a method for feature dimension reduction of an output power template includes:
an output power threshold array [ v1, v2, ], vn is set, wherein v1 is a first preset output power threshold, v2 is a second preset output power threshold, vn is an nth preset output power threshold, and v1< v2 </v;
randomly collecting a preset number of output power points on an output power curve, and marking a combination of output power V0 corresponding to the output power points as an output power collection group;
analyzing an output power threshold interval to which each output power in the output power acquisition group belongs:
if V1 is less than or equal to V0< V2, marking the corresponding V0 in the output power acquisition group as a preset characteristic parameter (v1+v2)/2;
if V2 is less than or equal to V0< V3, marking the corresponding V0 in the output power acquisition group as a preset characteristic parameter (v2+v3)/2;
...;
if vn-1 is less than or equal to V0< vn, marking the corresponding V0 in the output power acquisition group as a preset characteristic parameter (vn-1+vn)/2;
And combining characteristic parameters corresponding to each output power in the output power acquisition group, and sequencing the magnitudes in the combination process to form a characteristic parameter group.
In some embodiments of the present disclosure, a method for performing an equivalence comparison on power templates in a first output power template group includes:
the output power curves in the first output power template group are randomly combined in pairs to obtain a plurality of output power curve groups;
The output power curves in each output power curve group are overlapped and aligned, the overlapped and aligned method comprises the steps of carrying out left-right dynamic translation on one of the output power curves, judging the overlapped condition between the output power curves after each dynamic translation, and if the overlapped condition between the output power curves meets the preset standard, determining that the overlapped and aligned are completed at the moment;
calculating whether the output power curves after superposition alignment meet the equivalent judgment condition or not, and if so, recognizing the corresponding output power curve group as an output power curve group needing attention;
And if the repeated output power curves exist among the output power curve groups to be concerned, combining the repeated output power curve groups to obtain a second output power template group.
In some embodiments of the present disclosure, a method for determining a coincidence condition between output power curves includes:
trend analysis is carried out on the output power curve, and curve segments of the rising trend and the falling trend which are larger than or equal to a preset time period are marked;
and comparing marked curve segments between the output power curves, and if the time period of the trend coincidence is greater than or equal to a preset value in a preset time period, recognizing that the coincidence condition between the output power curves meets a preset standard.
In some embodiments of the present disclosure, a method of determining a referenceable degree of a mean output power template based on a number of output power templates in a second set of output power templates includes:
Setting a template quantity threshold value array [ a1, a2, ], an ] for the quantity of output power templates, wherein a1 is a first preset template quantity threshold value, a2 is a second preset template quantity threshold value, an is an nth preset template quantity threshold value, and a1< a2 </is < an >, a referenceable degree array [ g1, g2, ], gn ] is set, wherein g1 is a first referenceable degree, g2 is a second referenceable degree, gn is an nth referenceable degree, and g1< g2 </is "< gn >;
Judging a preset template number threshold interval to which the number A0 of the output power templates in the second output power template group belongs:
If A0 is less than a1, the referenceable degree of the average output power template is determined to be g1;
If a1 is less than or equal to A0< a2, the referenceable degree of the average output power template is determined to be g2;
if a2 is less than or equal to A0< a3, the referenceable degree of the average output power template is determined to be g3;
...;
If an-1 is less than or equal to A0< an, then the referenceable degree of the average output power template is determined to be gn.
In some embodiments of the present disclosure, a method for comparing a real-time output power of a battery collected in real-time with a different reference output power template includes:
substituting the real-time output power of the battery acquired in real time into reference output power curves corresponding to different reference output power templates, and calculating the vertical difference between the real-time output power corresponding to different time nodes and the reference output power curves;
Analyzing continuous characteristics of the vertical difference, determining the number of continuous time nodes of the vertical difference which is larger than or equal to a preset value in a preset time period, determining the coincidence parameter of the real-time output power and the reference power template based on the number of continuous time nodes and the accumulation amount of the vertical difference in the preset time period, and determining the coincidence reference output power template based on the coincidence parameter.
In some embodiments of the present disclosure, a method of determining a match parameter of a real-time output power and a reference power template includes:
An accumulation threshold value array [ h1, h2, ], wherein h1 is a first preset accumulation threshold value, h2 is a second preset accumulation threshold value, hn is an n preset accumulation threshold value, and h1< h2 </v > < hn, an abnormal parameter array [ s1, s2, ], sn ], wherein s1 is a first preset abnormal parameter, s2 is a second preset abnormal parameter, sn is an n preset abnormal parameter, and s1< s2 </v >, a continuous time node number threshold value array [ f1, f2, ], fn ], f1 is a first preset continuous time node number threshold value, f2 is a second preset continuous time node number threshold value, fn is an n preset continuous time node number threshold value, and f1< f2 </v >, an abnormal parameter adjustment coefficient array [ k1, k2, ], k1 is a second preset abnormal parameter, k2 </v, < k, and k is a maximum abnormal parameter, k < k is a preset abnormal parameter adjustment coefficient, k is a maximum value;
judging a preset accumulation amount threshold interval to which accumulation amount H0 of the vertical difference amount belongs in a preset time period:
if H0 is less than H1, the first preset abnormal parameter s1 is considered as a reference abnormal parameter;
If H1 is less than or equal to H0< H2, the second preset abnormal parameter s2 is determined to be a reference abnormal parameter;
...;
If hn-1 is less than or equal to H0< hn, the first preset abnormal parameter sn is determined to be the reference abnormal parameter.
Judging a preset continuous time node quantity threshold interval to which the number F0 of the continuous time nodes belongs:
If F0< F1, the determined coincidence parameter y=ymax-k1×s1;
If F1 is less than or equal to F0< F2, determining a conforming parameter Y=Ymax-k2 s2;
...;
If fn-1 is equal to or less than F0< fn, the determined coincidence parameter Y=Ymax-kn.
In some embodiments of the present disclosure, a lithium ion battery lithium separation safety performance detection system is also disclosed, including:
The first module is used for collecting the output power and the output voltage of the battery, constructing an output power template of the battery based on the collected output power, constructing an output voltage template of the battery based on the collected output voltage, and correlating the output power template and the output voltage template in a mode corresponding to the same time;
The second module is used for carrying out feature dimension reduction on the output power template, determining template feature data corresponding to the output power template, and classifying the output power template with the template feature data being consistent once to obtain a plurality of first output power template groups;
The third module is used for carrying out equivalence comparison on the output power templates in each first output power template group, and carrying out secondary classification on the output power templates meeting the equivalence requirements based on a preset equivalence identification standard to obtain a second output power template group;
A fourth module for carrying out average calculation on the output power templates in the second output power template group to obtain an average output power template, determining the referenceable degree of the average output power template based on the number of the output power templates in the second output power template group, and if the referenceable degree is greater than or equal to a preset value, determining the average output power template as a reference output power template;
The fifth module is used for comparing the real-time output power of the battery acquired in real time with different reference output power templates, determining a conforming reference output power template, and recognizing an output voltage template corresponding to the reference output power template as a reference output voltage template;
and the sixth module is used for comparing the real-time output voltage of the battery acquired in real time based on the reference output voltage template and determining whether lithium is precipitated from the battery based on the voltage difference characteristic.
The invention discloses a method and a system for detecting lithium-ion battery lithium-ion separation safety performance, which relate to the field of battery detection. And extracting a representative reference output power template by carrying out feature reduction and equivalence comparison on the output power template. And then, comparing the battery output power acquired in real time with a reference template to determine a matched reference output voltage template. And finally, comparing the real-time output voltage based on the reference output voltage template, and judging whether the lithium precipitation phenomenon exists in the battery according to the voltage difference characteristics. According to the technical scheme, the lithium ion battery lithium analysis condition is detected efficiently, accurately and in real time, and the safety performance of the battery is improved.
Drawings
Fig. 1 is a method step diagram of a method for detecting the lithium-ion battery lithium-precipitation safety performance.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
The invention aims to provide a lithium ion battery lithium-precipitation safety performance detection method and system capable of timely finding out the lithium-precipitation condition of a lithium ion battery.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
Referring to fig. 1, a method for detecting lithium separation safety performance of a lithium ion battery includes:
Step S100, collecting output power and output voltage of the battery, constructing an output power template of the battery based on the collected output power, constructing an output voltage template of the battery based on the collected output voltage, and correlating the output power template and the output voltage template in a mode corresponding to the same time.
The output power and output voltage of the battery are important parameters reflecting its operating state. By collecting these parameters, an output power template and an output voltage template of the battery can be constructed. The two templates are interrelated in an equivalent time-corresponding manner, meaning that at each point in time there is a corresponding output power value and output voltage value. Therefore, the working state of the battery can be comprehensively and accurately described through the two templates, and basic data is provided for subsequent lithium analysis detection.
In some embodiments of the present disclosure, a method of constructing an output power template includes:
And S101, constructing an output power coordinate system by taking time as a transverse coordinate and output power as an ordinate, configuring power coordinate points in the output power coordinate system based on the acquired output power, smoothly connecting the power coordinate points according to the advancing direction of a time axis to obtain an output power curve, and marking the output power curve as an output power template.
The method for constructing the output voltage template comprises the following steps:
And S102, constructing an output voltage coordinate system by taking time as a transverse coordinate and output voltage as an ordinate, configuring voltage coordinate points in the output voltage coordinate system based on the acquired output voltage, smoothly connecting the voltage coordinate points according to the advancing direction of a time axis to obtain an output voltage curve, and marking the output voltage curve as an output voltage template.
And step 200, performing feature dimension reduction on the output power templates, determining template feature data corresponding to the output power templates, and classifying the output power templates with the template feature data being consistent once to obtain a plurality of first output power template groups.
Since the battery's output power template may contain a large amount of data, the direct processing may be very complex. Therefore, it is necessary to perform feature dimension reduction to extract the most representative template feature data. The purpose of screening each output power template group is to classify the output power templates under the equivalent working state of the battery. Through feature degradation and classification, the data processing process can be simplified, the efficiency of the subsequent steps is improved, and a foundation is laid for subsequent equivalence analysis.
In some embodiments of the present disclosure, a method for feature dimension reduction of an output power template includes:
step S201, an output power threshold array [ v1, v2, ], vn is set, wherein v1 is a first preset output power threshold, v2 is a second preset output power threshold, vn is an nth preset output power threshold, and v1< v 2.
Step S202, a preset number of output power points on the output power curve are randomly collected, and the combination of output power V0 corresponding to the output power points is recorded as an output power collection group.
Step S203, an output power threshold interval to which each output power in the output power collection group belongs is analyzed.
If V1 is less than or equal to V0< V2, marking the corresponding V0 in the output power acquisition group as a preset characteristic parameter (v1+v2)/2.
If V2 is less than or equal to V0< V3, marking the corresponding V0 in the output power acquisition group as a preset characteristic parameter (v2+v3)/2.
...。
If vn-1 is less than or equal to V0< vn, marking the corresponding V0 in the output power acquisition group as a preset characteristic parameter (vn-1+vn)/2.
Step S204, combining the characteristic parameters corresponding to each output power in the output power acquisition group, and sorting the magnitudes in the combination process to form a characteristic parameter group.
And step S300, carrying out equivalence comparison on the output power templates in each first output power template group, and carrying out secondary classification on the output power templates meeting the equivalence requirements based on a preset equivalence identification standard to obtain a second output power template group.
On the basis of the first output power template set, a more representative output power template needs to be further screened. This is achieved by an equivalence comparison, i.e. comparing the similarity between different templates and selecting a template that meets the criteria according to preset equivalence recognition criteria. Each output power template in each second set of output power templates is identical and together represents a particular operating state of the battery. Templates with similar output power characteristics can be classified into one type through equivalence analysis to form a second output power template group. Thus, an output power template which can more accurately reflect different working states of the battery is obtained.
In some embodiments of the present disclosure, a method for performing an equivalence comparison on power templates in a first output power template group includes:
Step S301, the output power curves in the first output power template group are combined in a random mode to obtain a plurality of output power curve groups.
Step S302, the output power curves in each output power curve group are overlapped and aligned, the overlapped and aligned method comprises the steps of carrying out left-right dynamic translation on one of the output power curves, judging the overlapped condition between the output power curves after each dynamic translation, and if the overlapped condition between the output power curves meets the preset standard, determining that the overlapped and aligned operation is completed.
Step S303, calculating whether the output power curves after superposition alignment meet the equivalent judgment condition, and if so, recognizing the corresponding output power curve group as the output power curve group needing attention.
Step S304, if there is a repeated output power curve between the output power curve groups to be concerned, combining the repeated output power curve groups to obtain a second output power template group.
In some embodiments of the present disclosure, a method for determining a coincidence condition between output power curves includes:
in step S3021, trend analysis is performed on the output power curve, and curve segments with rising trend and falling trend greater than or equal to the preset time period are marked.
In step S3022, comparing marked curve segments between output power curves, and if the time period of the trend coincidence is greater than or equal to the preset value in the preset time period, determining that the coincidence condition between the output power curves meets the preset standard.
Step S400, carrying out average calculation on the output power templates in the second output power template group to obtain an average output power template, determining the referenceable degree of the average output power template based on the number of the output power templates in the second output power template group, and if the referenceable degree is greater than or equal to a preset value, determining the average output power template as the reference output power template.
Each of the templates in the second set of output power templates is representative of the battery under different operating conditions. By averaging these templates, a mean output power template is obtained that represents the average output power of the battery under normal operating conditions. Meanwhile, the referenceable degree of the average output power template can be evaluated according to the number of templates in the second output power template group. If the referenceable level is greater than or equal to the preset value, the average output power template is considered to be reliable and can be used as a reference for subsequent detection. The purpose of this step is to obtain a reference output power template that accurately reflects the normal operating conditions of the battery.
In some embodiments of the present disclosure, a method of determining a referenceable degree of a mean output power template based on a number of output power templates in a second set of output power templates includes:
In step S401, a template number threshold value array [ a1, a2, & gt, an ] is set for the number of output power templates, wherein a1 is a first preset template number threshold value, a2 is a second preset template number threshold value, an is an nth preset template number threshold value, and a1< a2< & gt, & lt an, a referenceable degree array [ g1, g2, & gt, gn ] is set, wherein g1 is a first referenceable degree, g2 is a second referenceable degree, gn is an nth referenceable degree, and g1< g2< & gt.
Step S402, determining a preset template number threshold interval to which the number A0 of output power templates in the second output power template group belongs:
If A0< a1, the referenceable level of the average output power template is determined to be g1.
If a1 is less than or equal to A0< a2, the referenceable degree of the average output power template is determined to be g2.
If a2 is less than or equal to A0< a3, the referenceable degree of the average output power template is determined to be g3.
...。
If an-1 is less than or equal to A0< an, then the referenceable degree of the average output power template is determined to be gn.
And S500, comparing the real-time output power of the battery acquired in real time with different reference output power templates, determining a matched reference output power template, and recognizing an output voltage template corresponding to the reference output power template as a reference output voltage template.
In the real-time detection phase, the real-time output power of the battery needs to be compared with a reference output power template obtained before. And by comparison, a reference output power template most consistent with the real-time output power can be found, and the corresponding output voltage template is identified as the reference output voltage template. The purpose of this step is to find the reference output voltage under the current working state of the battery, and provide basis for the subsequent judgment of whether the battery has lithium precipitation phenomenon. The current working state of the battery can be determined by comparing the real-time output power with the reference output power template, and the corresponding reference output voltage template is found.
In some embodiments of the present disclosure, a method for comparing a real-time output power of a battery collected in real-time with a different reference output power template includes:
Step S501, substituting the real-time output power of the battery acquired in real time into reference output power curves corresponding to different reference output power templates, and calculating the vertical difference between the real-time output power corresponding to different time nodes and the reference output power curves;
Step S502, analyzing continuous characteristics of the vertical difference, determining the number of continuous time nodes of the vertical difference which is larger than or equal to a preset value in a preset time period, determining the coincidence parameter of the real-time output power and the reference power template based on the number of continuous time nodes and the accumulation of the vertical difference in the preset time period, and determining the coincidence reference output power template based on the coincidence parameter.
In some embodiments of the present disclosure, a method of determining a match parameter of a real-time output power and a reference power template includes:
Step S5021, an accumulation threshold value array [ h1, h2, ], hn ] is set, wherein h1 is a first preset accumulation threshold value, h2 is a second preset accumulation threshold value, hn is an n preset accumulation threshold value, and h1< h2 </h < n >, an abnormal parameter array [ S1, S2, ], sn ] is set, S1 is a first preset abnormal parameter, S2 is a second preset abnormal parameter, sn is an n preset abnormal parameter, S1< S2 </sn >, an n threshold value array [ f1, f2, ], f1 is a first preset continuous node number threshold value, f2 is a second preset continuous node number threshold value, fn is an n preset continuous node number parameter, and f1< f2 </n >, an abnormal adjustment coefficient array [ k1, k2, ], k1< k2 </k > is a first preset continuous node number parameter, and k < k2 </k is a first preset abnormal coefficient, and k is a maximum adjustment coefficient.
Step S5022, judging a preset accumulation threshold interval to which the accumulation H0 of the vertical difference in the preset time period belongs:
if H0< H1, the first preset abnormal parameter s1 is considered as the reference abnormal parameter.
If H1 is less than or equal to H0< H2, the second preset abnormal parameter s2 is determined to be the reference abnormal parameter.
...。
If hn-1 is less than or equal to H0< hn, the first preset abnormal parameter sn is determined to be the reference abnormal parameter.
Step S5023, judging a preset continuous time node number threshold interval to which the continuous time node number F0 belongs:
if F0< F1, the determined coincidence parameter y=ymax-k 1 s1.
If F1 is less than or equal to F0< F2, the determined coincidence parameter Y=Ymax-k 2 s2.
...。
If fn-1 is equal to or less than F0< fn, the determined coincidence parameter Y=Ymax-kn.
And S600, comparing the real-time output voltage of the battery acquired in real time based on the reference output voltage template, and determining whether lithium is precipitated from the battery based on the voltage difference characteristic.
And finally, comparing the real-time output voltage of the battery acquired in real time with a reference output voltage template. By comparing the difference between the two, whether the lithium precipitation phenomenon exists in the battery can be judged. If there is a significant difference between the real-time output voltage and the reference output voltage, it is considered that the battery may have a lithium precipitation phenomenon. The principle of this step is based on the characteristic that the output voltage of the battery changes during lithium precipitation. By the method, the lithium precipitation condition of the battery can be timely and accurately found, and corresponding measures are taken to ensure the safe use of the battery. By comparing the real-time output voltage with the reference output voltage template, the lithium precipitation phenomenon of the battery can be effectively detected, and corresponding safety measures can be timely taken.
In some embodiments of the present disclosure, a lithium ion battery lithium separation safety performance detection system is also disclosed, including:
the first module is used for collecting the output power and the output voltage of the battery, constructing an output power template of the battery based on the collected output power, constructing an output voltage template of the battery based on the collected output voltage, and correlating the output power template and the output voltage template in a mode corresponding to the same time.
And the second module is used for carrying out feature dimension reduction on the output power templates, determining template feature data corresponding to the output power templates, and classifying the output power templates with the template feature data being consistent once to obtain a plurality of first output power template groups.
And the third module is used for carrying out equivalence comparison on the output power templates in each first output power template group, and carrying out secondary classification on the output power templates meeting the equivalence requirements based on a preset equivalence identification standard to obtain a second output power template group.
And a fourth module for carrying out average calculation on the output power templates in the second output power template group to obtain an average output power template, determining the referenceable degree of the average output power template based on the number of the output power templates in the second output power template group, and if the referenceable degree is greater than or equal to a preset value, determining the average output power template as the reference output power template.
And the fifth module is used for comparing the real-time output power of the battery acquired in real time with different reference output power templates, determining a conforming reference output power template, and recognizing an output voltage template corresponding to the reference output power template as a reference output voltage template.
And the sixth module is used for comparing the real-time output voltage of the battery acquired in real time based on the reference output voltage template and determining whether lithium is precipitated from the battery based on the voltage difference characteristic.
The invention discloses a method and a system for detecting lithium-ion battery lithium-ion separation safety performance, which relate to the field of battery detection. And extracting a representative reference output power template by carrying out feature reduction and equivalence comparison on the output power template. And then, comparing the battery output power acquired in real time with a reference template to determine a matched reference output voltage template. And finally, comparing the real-time output voltage based on the reference output voltage template, and judging whether the lithium precipitation phenomenon exists in the battery according to the voltage difference characteristics. According to the technical scheme, the lithium ion battery lithium analysis condition is detected efficiently, accurately and in real time, and the safety performance of the battery is improved.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. The method for detecting the lithium separation safety performance of the lithium ion battery is characterized by comprising the following steps of:
Collecting output power and output voltage of a battery, constructing an output power template of the battery based on the collected output power, constructing an output voltage template of the battery based on the collected output voltage, and correlating the output power template and the output voltage template in a mode corresponding to the same time;
Performing feature dimension reduction on the output power templates, determining template feature data corresponding to the output power templates, and classifying the output power templates with the template feature data being consistent once to obtain a plurality of first output power template groups;
Performing equivalence comparison on the output power templates in each first output power template group, and performing secondary classification on the output power templates meeting the equivalence requirements based on a preset equivalence identification standard to obtain a second output power template group;
Averaging the output power templates in the second output power template group to obtain an average output power template, determining the referenceable degree of the average output power template based on the number of the output power templates in the second output power template group, and if the referenceable degree is greater than or equal to a preset value, determining the average output power template as a reference output power template;
Comparing the real-time output power of the battery acquired in real time with different reference output power templates, determining a conforming reference output power template, and recognizing an output voltage template corresponding to the reference output power template as a reference output voltage template;
comparing the real-time output voltage of the battery acquired in real time based on the reference output voltage template, and determining whether lithium is separated from the battery based on the voltage difference characteristic;
constructing an output power coordinate system by taking time as a transverse coordinate and output power as an ordinate, configuring power coordinate points in the output power coordinate system based on the acquired output power, smoothly connecting the power coordinate points according to the progress direction of a time axis to obtain an output power curve, and marking the output power curve as an output power template;
The method for constructing the output voltage template comprises the following steps:
Constructing an output voltage coordinate system by taking time as a transverse coordinate and output voltage as an ordinate, configuring voltage coordinate points in the output voltage coordinate system based on the acquired output voltage, smoothly connecting the voltage coordinate points according to the advancing direction of a time axis to obtain an output voltage curve, and recording the output voltage curve as an output voltage template;
an output power threshold array [ v1, v2, ], vn is set, wherein v1 is a first preset output power threshold, v2 is a second preset output power threshold, vn is an nth preset output power threshold, and v1< v2 </v;
randomly collecting a preset number of output power points on an output power curve, and marking a combination of output power V0 corresponding to the output power points as an output power collection group;
analyzing an output power threshold interval to which each output power in the output power acquisition group belongs:
if V1 is less than or equal to V0< V2, marking the corresponding V0 in the output power acquisition group as a preset characteristic parameter (v1+v2)/2;
if V2 is less than or equal to V0< V3, marking the corresponding V0 in the output power acquisition group as a preset characteristic parameter (v2+v3)/2;
...;
if vn-1 is less than or equal to V0< vn, marking the corresponding V0 in the output power acquisition group as a preset characteristic parameter (vn-1+vn)/2;
And combining characteristic parameters corresponding to each output power in the output power acquisition group, and sequencing the magnitudes in the combination process to form a characteristic parameter group.
2. The method for detecting lithium ion battery lithium separation safety performance according to claim 1, wherein the method for performing equivalence comparison on the power templates in the first output power template group comprises the following steps:
the output power curves in the first output power template group are randomly combined in pairs to obtain a plurality of output power curve groups;
The output power curves in each output power curve group are overlapped and aligned, the overlapped and aligned method comprises the steps of carrying out left-right dynamic translation on one of the output power curves, judging the overlapped condition between the output power curves after each dynamic translation, and if the overlapped condition between the output power curves meets the preset standard, determining that the overlapped and aligned are completed at the moment;
calculating whether the output power curves after superposition alignment meet the equivalent judgment condition or not, and if so, recognizing the corresponding output power curve group as an output power curve group needing attention;
And if the repeated output power curves exist among the output power curve groups to be concerned, combining the repeated output power curve groups to obtain a second output power template group.
3. The method for detecting lithium ion battery lithium separation safety performance according to claim 2, wherein the method for judging coincidence condition between output power curves comprises:
trend analysis is carried out on the output power curve, and curve segments of the rising trend and the falling trend which are larger than or equal to a preset time period are marked;
and comparing marked curve segments between the output power curves, and if the time period of the trend coincidence is greater than or equal to a preset value in a preset time period, recognizing that the coincidence condition between the output power curves meets a preset standard.
4. The method for detecting the lithium ion battery lithium separation safety performance according to claim 1, wherein the method for determining the referenceable degree of the average output power template based on the number of output power templates in the second output power template group comprises the following steps:
Setting a template quantity threshold value array [ a1, a2, ], an ] for the quantity of output power templates, wherein a1 is a first preset template quantity threshold value, a2 is a second preset template quantity threshold value, an is an nth preset template quantity threshold value, and a1< a2 </is < an >, a referenceable degree array [ g1, g2, ], gn ] is set, wherein g1 is a first referenceable degree, g2 is a second referenceable degree, gn is an nth referenceable degree, and g1< g2 </is "< gn >;
Judging a preset template number threshold interval to which the number A0 of the output power templates in the second output power template group belongs:
If A0 is less than a1, the referenceable degree of the average output power template is determined to be g1;
If a1 is less than or equal to A0< a2, the referenceable degree of the average output power template is determined to be g2;
if a2 is less than or equal to A0< a3, the referenceable degree of the average output power template is determined to be g3;
...;
If an-1 is less than or equal to A0< an, then the referenceable degree of the average output power template is determined to be gn.
5. The method for detecting the lithium ion battery lithium separation safety performance according to claim 1, wherein the method for comparing the real-time output power of the battery acquired in real time with different reference output power templates comprises the following steps:
substituting the real-time output power of the battery acquired in real time into reference output power curves corresponding to different reference output power templates, and calculating the vertical difference between the real-time output power corresponding to different time nodes and the reference output power curves;
Analyzing continuous characteristics of the vertical difference, determining the number of continuous time nodes of the vertical difference which is larger than or equal to a preset value in a preset time period, determining the coincidence parameter of the real-time output power and the reference power template based on the number of continuous time nodes and the accumulation amount of the vertical difference in the preset time period, and determining the coincidence reference output power template based on the coincidence parameter.
6. The method for detecting the lithium ion battery lithium separation safety performance according to claim 5, wherein the method for determining the coincidence parameter of the real-time output power and the reference power template comprises the following steps:
An accumulation threshold value array [ h1, h2, ], wherein h1 is a first preset accumulation threshold value, h2 is a second preset accumulation threshold value, hn is an n preset accumulation threshold value, and h1< h2 </v > < hn, an abnormal parameter array [ s1, s2, ], sn ], wherein s1 is a first preset abnormal parameter, s2 is a second preset abnormal parameter, sn is an n preset abnormal parameter, and s1< s2 </v >, a continuous time node number threshold value array [ f1, f2, ], fn ], f1 is a first preset continuous time node number threshold value, f2 is a second preset continuous time node number threshold value, fn is an n preset continuous time node number threshold value, and f1< f2 </v >, an abnormal parameter adjustment coefficient array [ k1, k2, ], k1 is a second preset abnormal parameter, k2 </v, < k, and k is a maximum abnormal parameter, k < k is a preset abnormal parameter adjustment coefficient, k is a maximum value;
Step S5022, judging a preset accumulation threshold interval to which the accumulation H0 of the vertical difference in the preset time period belongs:
if H0 is less than H1, the first preset abnormal parameter s1 is considered as a reference abnormal parameter;
If H1 is less than or equal to H0< H2, the second preset abnormal parameter s2 is determined to be a reference abnormal parameter;
...;
If hn-1 is less than or equal to H0< hn, the first preset abnormal parameter sn is determined to be the reference abnormal parameter.
Judging a preset continuous time node quantity threshold interval to which the number F0 of the continuous time nodes belongs:
If F0< F1, the determined coincidence parameter y=ymax-k1×s1;
If F1 is less than or equal to F0< F2, determining a conforming parameter Y=Ymax-k2 s2;
...;
If fn-1 is equal to or less than F0< fn, the determined coincidence parameter Y=Ymax-kn.
7. A lithium ion battery lithium-separation safety performance detection system, characterized in that it is configured to perform the lithium ion battery lithium-separation safety performance detection method according to any one of claims 1 to 6, and includes:
The first module is used for collecting the output power and the output voltage of the battery, constructing an output power template of the battery based on the collected output power, constructing an output voltage template of the battery based on the collected output voltage, and correlating the output power template and the output voltage template in a mode corresponding to the same time;
The second module is used for carrying out feature dimension reduction on the output power template, determining template feature data corresponding to the output power template, and classifying the output power template with the template feature data being consistent once to obtain a plurality of first output power template groups;
The third module is used for carrying out equivalence comparison on the output power templates in each first output power template group, and carrying out secondary classification on the output power templates meeting the equivalence requirements based on a preset equivalence identification standard to obtain a second output power template group;
A fourth module for carrying out average calculation on the output power templates in the second output power template group to obtain an average output power template, determining the referenceable degree of the average output power template based on the number of the output power templates in the second output power template group, and if the referenceable degree is greater than or equal to a preset value, determining the average output power template as a reference output power template;
The fifth module is used for comparing the real-time output power of the battery acquired in real time with different reference output power templates, determining a conforming reference output power template, and recognizing an output voltage template corresponding to the reference output power template as a reference output voltage template;
and the sixth module is used for comparing the real-time output voltage of the battery acquired in real time based on the reference output voltage template and determining whether lithium is precipitated from the battery based on the voltage difference characteristic.
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