CN115993541A - Nondestructive lithium analysis detection method and related device for lithium iron phosphate battery - Google Patents
Nondestructive lithium analysis detection method and related device for lithium iron phosphate battery Download PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 136
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title claims abstract description 78
- 238000001514 detection method Methods 0.000 title claims abstract description 39
- 238000004458 analytical method Methods 0.000 title claims abstract description 37
- 238000001556 precipitation Methods 0.000 claims abstract description 83
- 238000000034 method Methods 0.000 claims abstract description 67
- 230000008569 process Effects 0.000 claims description 31
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 26
- 229910001416 lithium ion Inorganic materials 0.000 claims description 26
- 238000004590 computer program Methods 0.000 claims description 13
- 238000005457 optimization Methods 0.000 claims description 13
- 238000013507 mapping Methods 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 239000010439 graphite Substances 0.000 claims description 11
- 229910002804 graphite Inorganic materials 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 7
- 230000001066 destructive effect Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 description 16
- 238000012360 testing method Methods 0.000 description 10
- 238000000926 separation method Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004445 quantitative analysis Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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- 230000002441 reversible effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The embodiment of the application discloses a nondestructive lithium analysis detection method and a related device for a lithium iron phosphate battery, which are applied to electronic equipment, wherein the method comprises the following steps: acquiring a first charge-discharge curve of a target lithium iron phosphate battery, wherein the first charge-discharge curve comprisesnA ring; obtaining the first charge-discharge curve
Second charge-discharge curve of the ring and the firstbA third charge-discharge curve of the circle; acquisition by a second charge-discharge curvePA first angle slope and a first capacity value; acquisition by a third charge-discharge curvePA second angle slope and a second capacity value; according toPSlope of first included anglePDetermining a target slope ratio by the second included angle slopes; determining a target capacity ratio value according to the first capacity value and the second capacity value; determining a target lithium precipitation parameter according to the target slope ratio and the target capacity ratioThe method comprises the steps of carrying out a first treatment on the surface of the And when the target lithium precipitation parameter is in a preset interval range, determining that the target lithium iron phosphate battery has lithium precipitation. By adopting the embodiment of the application, the nondestructive lithium analysis detection efficiency can be improved.
Description
Technical Field
The application relates to the technical field of new energy or the technical field of batteries, in particular to a nondestructive lithium analysis detection method and a related device for a lithium iron phosphate battery.
Background
The current judgment and quantitative analysis of lithium separation conditions of lithium batteries mainly depend on a destructive detection method such as disassembly, the accuracy of the current nondestructive detection method depends on a large amount of data analysis, and a battery sample to be judged is enough to be judged after being detected for a plurality of times or by a precise detection instrument, so that the time consumption and the data quantity are large, and the method depends on the precise instrument. Most nondestructive tests depend on internal resistance tests, the test process needs high-temperature heating or pulse tests, and the test process needs to be additionally connected with corresponding test instruments to perform additional tests, and the tests have irreversible loss on batteries, so that the follow-up parameter optimization and improvement on the battery process are affected due to the quantification of lithium precipitation conditions, and therefore, the problem of how to greatly improve the nondestructive lithium precipitation detection efficiency is urgently solved.
Disclosure of Invention
The embodiment of the application provides a nondestructive lithium analysis detection method and a related device for a lithium iron phosphate battery, which can improve the efficiency and the speed of nondestructive lithium analysis detection and greatly reduce the cost.
In a first aspect, an embodiment of the present application provides a method for detecting lithium ion battery without analysis, applied to an electronic device, where the method includes:
Acquiring a first charge-discharge curve of a target lithium iron phosphate battery, wherein the first charge-discharge curve comprisesnA ring, saidnThe circle representation includesnThe secondary complete charge-discharge process is carried out,nis an integer greater than or equal to 2;
acquiring the first charge-discharge curve from the first charge-discharge curve
Second charge-discharge curve of the ring and the firstbThird charge-discharge curve of circle, +.>
，bAre all greater than or equal to 1 and less than or equal tonAnd->
Not equal tob；
Acquisition by the second charge-discharge curvePEach included angle slope corresponds to a platform type, and the platform type comprises any one of the following components: a first platform, a second platform and a third platform; the first platform is an initial platform for reaching charging, and the second platform is a stable charging platform, specifically: lithium ions pass through the diaphragm from the positive electrode to the platform on the surface of the negative electrode; the third platform is a platform for inserting lithium ions into gaps in the negative electrode graphite particles;Pis an integer greater than or equal to 1;
acquisition by the third charge-discharge curvePA second included angle slope and a second capacity value, saidPThe platform type of each included angle slope in the second included angle slopes and the included angle slopePThe platform types of each included angle slope of the first included angle slopes correspond one to one;
According to the describedPA first included angle slope and thePDetermining a target slope ratio by the second included angle slopes;
determining a target capacity ratio value according to the first capacity value and the second capacity value;
determining a target lithium precipitation parameter according to the target slope ratio and the target capacity ratio;
when the target lithium precipitation parameter is in a preset interval range, determining that lithium precipitation exists in the target lithium iron phosphate battery;
and when the target lithium precipitation parameter is not in the preset interval range, determining that the target lithium iron phosphate battery does not have lithium precipitation.
In a second aspect, an embodiment of the present application provides a non-destructive lithium analysis detection apparatus for a lithium iron phosphate battery, which is applied to an electronic device, and the apparatus includes: a first acquisition unit, a second acquisition unit, a determination unit and a detection unit, wherein,
the first obtaining unit is configured to obtain a first charge-discharge curve of a target lithium iron phosphate battery, where the first charge-discharge curve includesnA ring, saidnThe circle representation includesnThe secondary complete charge-discharge process is carried out,nis an integer greater than or equal to 2; acquiring a first charge-discharge curve from the first charge-discharge curve
Second charge-discharge curve of the ring and the firstbThird charge-discharge curve of circle, +. >
，bAre all greater than or equal to 1 and less than or equal tonAnd->
Not equal tob；
The second acquisition unit is used for acquiring through the second charge-discharge curvePEach included angle slope corresponds to a platform type, and the platform type comprises any one of the following components: a first platform, a second platform and a third platform; the first platform is an initial platform for reaching charging, and the second platform is a stable charging platform, specifically: lithium ions pass through the diaphragm from the positive electrode to the platform on the surface of the negative electrode; the third platform is a platform for inserting lithium ions into gaps in the negative electrode graphite particles;Pis an integer greater than or equal to 1; obtaining through the third charge-discharge curvePA second included angle slope and a second capacity value, saidPThe platform type of each included angle slope in the second included angle slopes and the included angle slopePThe platform types of each included angle slope of the first included angle slopes correspond one to one;
the determining unit is used for according to thePA first included angle slope and thePDetermining a target slope ratio by the second included angle slopes; determining a target capacity ratio value according to the first capacity value and the second capacity value; determining a target lithium precipitation parameter according to the target slope ratio and the target capacity ratio;
The detection unit is used for determining that the target lithium iron phosphate battery has lithium precipitation when the target lithium precipitation parameter is in a preset interval range; and when the target lithium precipitation parameter is not in the preset interval range, determining that the target lithium iron phosphate battery does not have lithium precipitation.
In a third aspect, an embodiment of the present application provides an electronic device, including a processor, a memory, a communication interface, and one or more programs, where the one or more programs are stored in the memory and configured to be executed by the processor, and the programs include instructions for performing the steps in the first aspect of the embodiment of the present application.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium, where the computer-readable storage medium stores a computer program for electronic data exchange, where the computer program causes a computer to perform some or all of the steps as described in the first aspect of the embodiments of the present application.
In a fifth aspect, embodiments of the present application provide a computer program product, wherein the computer program product comprises a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps described in the first aspect of the embodiments of the present application. The computer program product may be a software installation package.
By implementing the embodiment of the application, the following beneficial effects are achieved:
it can be seen that the nondestructive lithium analysis detection method and the relevant device for the lithium iron phosphate battery described in the embodiments of the present application are applied to an electronic device, and the method and the relevant device are applied to obtain a first charge-discharge curve of a target lithium iron phosphate battery, where the first charge-discharge curve includesnThe ring is provided with a plurality of grooves,nthe circle representation includesnThe secondary complete charge-discharge process is carried out,nobtaining the first charge-discharge curve from the first charge-discharge curve for an integer greater than or equal to 2
Second charge-discharge curve of the ring and the firstbThird charge-discharge curve of circle, +.>
，bAre all greater than or equal to 1 and less than or equal tonAnd->
Not equal tobObtaining through a second charge-discharge curvePEach first included angle slope corresponds to a platform type, and the platform type comprises any one of the following components: a first platform, a second platform and a third platform; the first platform is an initial platform for reaching charging, and the second platform is a stable charging platform, specifically: lithium ions pass through the diaphragm from the positive electrode to the platform on the surface of the negative electrode; the third platform is a platform for lithium ions to be intercalated into gaps in the negative graphite particles;Pis an integer greater than or equal to 1, and is obtained through a third charge-discharge curve PA second angle slope and a second capacity value,Pplatform type and each included angle slope in the second included angle slopesPThe platform type of each included angle slope of the first included angle slopes corresponds to each other one by one according toPSlope of first included anglePThe second included angle slope determines a target slope ratio, a target capacity ratio is determined according to the first capacity value and the second capacity value, a target lithium precipitation parameter is determined according to the target slope ratio and the target capacity ratio, when the target lithium precipitation parameter is in a preset interval range, the existence of lithium precipitation of the target lithium iron phosphate battery is determined, when the target lithium precipitation parameter is not in the preset interval range, the absence of lithium precipitation of the target lithium iron phosphate battery is determined, further, the lithium precipitation condition can be intuitively and rapidly judged through the target lithium precipitation parameter, the nondestructive lithium precipitation detection efficiency can be improved, the time cost and the instrument cost are greatly reduced, and the safety of the battery can be optimized and improved through judgment on the lithium precipitation condition.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a nondestructive lithium analysis detection method for a lithium iron phosphate battery according to an embodiment of the present application;
fig. 2 is a schematic illustration of a charge-discharge curve according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
fig. 4 is a functional unit composition block diagram of a nondestructive lithium analysis detection device for a lithium iron phosphate battery according to an embodiment of the present application.
Detailed Description
The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to the list of steps or elements but may include, in one possible example, other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The electronic device according to the embodiment of the present application may include, but is not limited to: smart phones, tablet computers, smart robots, in-vehicle devices, wearable devices, battery products, computing devices, or other processing devices connected to a wireless modem, as well as various forms of User Equipment (UE), mobile Station (MS), terminal devices (terminal devices), etc., without limitation, the electronic device may also be a server, or other battery lithium-precipitation detection device.
In this embodiment of the present application, a complete charge and discharge process of the lithium iron phosphate battery may be referred to as a circle, that is, a complete charge process and a complete discharge process exist in a circle.
In this embodiment of the application, the lithium iron phosphate battery charge-discharge curve has three marked platforms, and first platform is the initial platform that reaches the charge, and the second platform is the stable platform that charges, and lithium ion passes the diaphragm from the anodal platform that reaches the negative pole surface promptly, and the third platform is the platform in lithium ion intercalation negative pole graphite granule clearance, and when the embedding condition is good, then charge voltage is stable.
Referring to fig. 1, fig. 1 is a flow chart of a nondestructive lithium analysis detection method for a lithium iron phosphate battery according to an embodiment of the present application, as shown in the drawing, applied to an electronic device, where the method includes:
101. acquiring a first charge-discharge curve of a target lithium iron phosphate battery, wherein the first charge-discharge curve comprisesnA ring, saidnThe circle representation includesnThe secondary complete charge-discharge process is carried out,nis an integer greater than or equal to 2.
In this embodiment of the present application, a first charge-discharge curve of a target lithium iron phosphate battery in a preset time period may be obtained, where the first charge-discharge curve includesnThe ring is provided with a plurality of grooves,nthe circle representation may includenThe secondary complete charge-discharge process is carried out,nis an integer greater than 2 or equal, i.e., each turn may include a charge curve and a discharge curve. The preset time period may be preset or the system defaults.
In a specific implementation, the horizontal axis of the first charge-discharge curve may be a capacity value, the vertical axis may be a voltage value, or the vertical axis of the first charge-discharge curve may be a capacity value, and the horizontal axis may be a voltage value.
In a specific implementation, the target lithium iron phosphate battery can be any type of lithium iron phosphate battery, the electronic equipment and the target lithium iron phosphate battery can be in communication connection, and the electronic equipment can monitor the charging and discharging process of the target lithium iron phosphate battery so as to obtain a first charging and discharging curve of the target lithium iron phosphate battery.
In particular implementations, the target lithium iron phosphate battery may include one or more batteries, for example, the electronic device may monitor each battery within the internal cells in real time in conjunction with a battery management system.
In a specific implementation, the lithium analysis determination condition can be followed after the first cycle of the battery cycle begins, that is, the battery can begin to be used. In the specific implementation, the internal condition of the battery can be followed in real time without other testing equipment.
In particular, the embodiments of the present application may be applicable to environmental conditions of different situations, such as a high-low temperature environment, an oscillation environment, a dust room, and the like, which are not limited herein.
In the embodiment of the application, the data size is small and can be used, and the number of loops is only greater than 1 (1 loop), so that the method is not limited by the number of loops and does not need other data support.
102. Acquiring the first charge-discharge curve from the first charge-discharge curve
Second charge-discharge curve of the ring and the firstbThird charge-discharge curve of circle, +.>
，bAre all greater than or equal to 1 and less than or equal tonAnd->
Not equal tob。
In a specific implementation, the first charge-discharge curve may include at least more than 2 circles of charge-discharge curves, and further, 2 different circles of charge-discharge curves may be selected for lithium analysis detection.
In a specific implementation, the first charge-discharge curve can be obtained
A second charge-discharge curve of the loop and acquisition of the firstbThird charge-discharge curve of circle, +.>
，bAre all greater than or equal to 1 and less than or equal tonAnd->
Not equal tobAnd then carrying out lithium precipitation detection by utilizing the correlation between 2 charge-discharge curves.
103. Acquisition by the second charge-discharge curvePEach included angle slope corresponds to a platform type, and the platform type comprises any one of the following components: a first platform, a second platform and a third platform; the first platform is an initial platform for reaching charging, and the second platform is a stable charging platform, specifically: lithium ions pass through the diaphragm from the positive electrode to the platform on the surface of the negative electrode; the third platform is a platform for inserting lithium ions into gaps in the negative electrode graphite particles; PIs an integer greater than or equal to 1.
In this embodiment, as illustrated in fig. 2, a solid line represents a charging curve, a broken line represents a discharging curve, and the horizontal axis represents capacity (Ah) and the vertical axis represents voltage (V) regardless of the charging curve or the discharging curve. In the using process of the battery, the charging and discharging conditions can be collected in real time, the voltage and the capacity in the charging and discharging processes are corresponding to each other, a charging and discharging curve is drawn, when the charging and discharging curve is collected, the slope at the first intersection point of the charging curve and the discharging curve is k1 after the charging curve reaches the first platform, the rising slope of the charging curve when the charging curve reaches the second platform is k3, the slope of the curve between the first discharging platform and the second discharging platform is k2, and the slope between the second discharging platform and the third discharging platform is k4.
In specific implementation, a curve where a platform is located can be fitted to obtain a fitted straight line, and the slope of the fitted straight line is used as the slope of an included angle of the platform.
In this embodiment of the present application, since the second charge-discharge curve includes a charge curve and a discharge curve, each charge curve may correspond to a different platform type, each discharge curve may also correspond to a different platform type, the second charge-discharge curve is 1 turn, and 1 turn corresponds to a capacity value, and further, may be obtained through the second charge-discharge curve PA first angle slope and a first capacity value.
104. Acquisition by the third charge-discharge curvePA second included angle slope and a second capacity value, saidPThe platform type of each included angle slope in the second included angle slopes and the included angle slopePThe platform types of each included angle slope of the first included angle slopes are in one-to-one correspondence.
In the specific implementation, the same principle can be used for fitting a curve of a platform to obtain a fitting straight line, and the slope of the fitting straight line is used as the slope of an included angle of the platform.
In this embodiment of the present application, since the third charge and discharge curve includes a charge curve and a discharge curve, each charge curve may correspond to a different platform type, each discharge curve may also correspond to a different platform type, the third charge and discharge curve is 1 turn, and 1 turn corresponds to a capacity value, and further, may be obtained through the third charge and discharge curvePA second angle slope and a second capacity value.
105. According to the describedPA first included angle slope and thePThe second included angle slope determines a target slope ratio.
In particular implementation, it is possible toPSlope of the first included anglePAnd carrying out ratio operation on the slopes corresponding to the platform types in the slopes of the second included angles to obtain at least one ratio result, and determining a target slope ratio according to the at least one ratio result.
Optionally, step 105 above is according to the abovePA first included angle slope and thePThe target slope ratio is determined by the slope of the second included angle according to the following stepsThe method is implemented in the following manner:
the P first included angle slopes are matched with the first included angle slopePAnd (3) carrying out ratio on the included angle slopes with the same platform type in the second included angle slopes to obtain the target slope ratio, wherein the target slope ratio is specifically as follows: the target slope ratio is determined according to the following formula:
wherein ,
representing the target slope ratio,/->
Representing the->
The ring is provided with a plurality of grooves,brepresents the firstbCircle (S)>
Representing the->
First of the ringiThe slope of each included angle; />
Represents the firstbFirst of the ringiThe slope of each included angle;Prepresenting the->
Total number of angular slopes of the circle.
In a specific implementation, for example, the included angle slopes in each circle can be numbered in the same way, and then the ratio operation can be performed on the included angle slopes with the same number.
106. And determining a target capacity ratio according to the first capacity value and the second capacity value.
In a specific implementation, the first capacity value and the second capacity value may be subjected to a ratio operation to obtain a target capacity ratio.
Optionally, the step 106 of determining the target capacity ratio according to the first capacity value and the second capacity value may include the following steps:
The target capacity ratio is determined according to the following formula, specifically:
wherein ,
representing the target capacity ratio,/->
Representing said first capacity value,/and->
Representing the second capacity value.
In specific implementation, the ratio operation is directly performed on the first capacity value and the second capacity value, and then the target capacity ratio can be obtained.
107. And determining a target lithium precipitation parameter according to the target slope ratio and the target capacity ratio.
In specific implementation, the target slope ratio and the target capacity ratio can be subjected to ratio operation to obtain the target lithium precipitation parameter.
Specifically, the target lithium precipitation parameter may be determined according to the following formula, specifically as follows:
wherein ,
representing the target lithium evolution parameter,/->
Representing the target slope ratio, ++>
Representing a target capacity ratio.
108. And when the target lithium precipitation parameter is in a preset interval range, determining that the target lithium iron phosphate battery has lithium precipitation.
The preset interval range may be preset or default.
In the embodiment of the application, when the target lithium precipitation parameter is in the preset interval range, it can be determined that the target lithium iron phosphate battery has lithium precipitation, that is, the judgment mode is visual and rapid. Of course, the lithium precipitation degree can be quantified according to the value of the target lithium precipitation parameter, for example, when the value exceeds 0.3, the lithium precipitation condition is serious, dead lithium is easy to form, and the short circuit risk is caused, so that whether the lithium precipitation condition is reversible or not can be judged, and whether the potential safety hazard exists or not is judged.
In a specific implementation, when lithium precipitation occurs, the current magnitude of the charging process and the discharging process, the voltage magnitude at constant voltage and the magnitude of the termination voltage can be correspondingly improved, for example, the current magnitude of different multiplying powers, namely, the subsequent current magnitude of the battery can be adjusted according to rated capacity.
Of course, the battery product can be combined to feed back the service condition of the customer in real time, so that the battery can be used more efficiently and safely.
For example, in a specific implementation, comparing the slopes of the front and rear turns, and comparing the slope ratio with the capacity ratio of the front and rear turns, and when the ratio is within the interval [0.01,1 ], determining that lithium is separated. As the ratio approaches 1, the lithium evolution is more serious.
109. And when the target lithium precipitation parameter is not in the preset interval range, determining that the target lithium iron phosphate battery does not have lithium precipitation.
In the specific implementation, when the target lithium precipitation parameter is not in the preset interval range, determining that the target lithium iron phosphate battery does not have lithium precipitation, the safety of the battery is high.
In particular, the monitored interference factors are few, such as temperature, environmental cleanliness, whether in a steady environment, etc.
For example, in the use process of the battery, the charge and discharge conditions can be collected in real time, the voltage and the capacity in the charge and discharge processes are corresponding to each other, a charge and discharge curve is drawn, the charge and discharge curve is collected, the included angle slope k1 of the charge curve to the discharge curve when reaching the first platform, the included angle slope k2 of the charge curve to the second platform, the included angle slope k3 of the charge curve to the first platform, and the included angle slope k4 of the discharge curve to the second platform. Comparing the slopes of the front and rear circles, comparing the slope ratio with the capacity C ratio of the front and rear circles, and judging lithium precipitation when the ratio is in the interval [0.01,1 ]. As the ratio approaches 1, the lithium evolution is more serious.
In this embodiment of the application, considering the use of battery, the process that promptly belongs to charge and discharge, combine the charge and discharge curve to carry out the analysis, can accomplish real-time supervision to the battery, consequently, to battery product, can also combine feedback program in the use, to user's product real-time supervision, if appear separating lithium, then carry out follow-up to the improvement of conditions such as electric current size, constant voltage and discharge termination voltage, make and separate lithium condition recoverable to do not influence the normal operating and the use of battery, can realize following the feedback in real time to the product. The method does not need to carry out qualitative and quantitative analysis on the lithium conditions through a large amount of data, can rapidly judge, and can realize real-time monitoring on the battery conditions. In the specific implementation, the lithium separation judgment can be carried out in the use process of the battery, and the judgment method has no influence on the use of the battery, and of course, the subsequent use of the battery or related tests can be improved in time, so that the lithium separation condition can be recovered.
Optionally, the method further comprises the following steps:
a1, acquiring target attribute information corresponding to the target lithium iron phosphate battery;
a2, determining a reference interval range corresponding to the target attribute information, wherein the reference interval range comprises an upper limit threshold value and a lower limit threshold value;
A3, acquiring target service condition parameters of the target lithium iron phosphate battery;
a4, determining a target regulation parameter corresponding to the target use condition parameter;
a5, adjusting the lower limit threshold according to the target adjusting parameter to obtain a target lower limit threshold;
a6, determining the preset interval range according to the target lower limit threshold and the target upper limit threshold.
In a specific implementation, different interval ranges can be set for different lithium iron phosphate batteries. The target attribute information may include at least one of: the model number, manufacturer, specification, date of manufacture, etc., are not limited herein. The mapping relation between the attribute information and the interval range of the preset lithium iron phosphate battery can be preset, and further, the reference interval range corresponding to the target attribute information can be determined based on the mapping relation. The reference interval range may include an upper threshold and a lower threshold.
In the embodiment of the present application, the usage parameters may include at least one of the following: the total number of charge and discharge, the use environment temperature, the use battery stability, the environment cleanliness of the battery, and the like are not limited herein. The mapping relation between the preset use condition parameters and the adjustment parameters can be preset, the target adjustment parameters corresponding to the target use condition parameters can be determined based on the mapping relation, further, the lower limit threshold can be adjusted according to the target adjustment parameters to obtain the target lower limit threshold, and the preset interval range is determined according to the target lower limit threshold and the upper limit threshold, namely the preset interval range can be [ the target lower limit threshold and the upper limit threshold ], so that the interval range of lithium precipitation can be adjusted based on the use condition of the battery, the actual lithium precipitation detection is more in accordance with the actual condition, and the lithium precipitation detection accuracy is improved.
Optionally, the method further comprises the following steps:
b1, determining a target lithium analysis severity level corresponding to the target lithium analysis parameter according to a mapping relation between a preset ratio and the lithium analysis severity level;
b2, determining target optimization parameters corresponding to the target lithium precipitation severity level;
b3, adjusting the current charge and discharge parameters according to the target optimization parameters to obtain target charge and discharge parameters;
and B4, controlling the target lithium iron phosphate battery to perform charge and discharge operation through the target charge and discharge parameters.
In a specific implementation, the target charge-discharge parameters may include at least one of: the magnitude of the current in the charging process, the magnitude of the current in the discharging process, the magnitude of the voltage at constant voltage, the magnitude of the termination voltage, the charging duration, the discharging duration, the charging mode, and the like are not limited herein.
In the embodiment of the present application, a mapping relationship between a preset ratio and a lithium separation severity level may be stored in advance, and further, a target lithium separation severity level corresponding to a target lithium separation parameter may be determined based on the mapping relationship, and different optimization parameters may be configured for different severity levels, specifically, a mapping relationship between a preset severity level and an optimization parameter may be preset, and based on the mapping relationship, a target optimization parameter corresponding to the target lithium separation severity level may be determined, and then, a current charge and discharge parameter may be adjusted according to the target optimization parameter, so as to obtain a target charge and discharge parameter, and the target lithium iron phosphate battery may be controlled to perform a charge and discharge operation through the target charge and discharge parameter.
It can be seen that the nondestructive lithium analysis detection method for the lithium iron phosphate battery described in the embodiments of the present application is applied to an electronic device, and obtains a first charge-discharge curve of a target lithium iron phosphate battery, where the first charge-discharge curve includesnThe ring is provided with a plurality of grooves,nthe circle representation includesnThe secondary complete charge-discharge process is carried out,nobtaining the first charge-discharge curve from the first charge-discharge curve for an integer greater than or equal to 2
Second charge-discharge curve of the ring and the firstbThird charge-discharge curve of circle, +.>
，bAre all greater than or equal to 1 and less than or equal tonAnd->
Not equal tobObtaining through a second charge-discharge curvePEach first included angle slope corresponds to a platform type, and the platform type comprises any one of the following components: a first platform, a second platform and a third platform; the first platform is an initial platform for reaching charging, and the second platform is a stable charging platform, specifically: lithium ions pass through the diaphragm from the positive electrode to the platform on the surface of the negative electrode; the third platform is a platform for lithium ions to be intercalated into gaps in the negative graphite particles;Pis an integer greater than or equal to 1, and is obtained through a third charge-discharge curvePA second angle slope and a second capacity value,Pplatform type and each included angle slope in the second included angle slopes PThe platform type of each included angle slope of the first included angle slopes corresponds to each other one by one according toPSlope of first included anglePThe second included angle slope determines a target slope ratio, a target capacity ratio is determined according to the first capacity value and the second capacity value, a target lithium precipitation parameter is determined according to the target slope ratio and the target capacity ratio, when the target lithium precipitation parameter is in a preset interval range, the existence of lithium precipitation of the target lithium iron phosphate battery is determined, when the target lithium precipitation parameter is not in the preset interval range, the absence of lithium precipitation of the target lithium iron phosphate battery is determined, further, the lithium precipitation condition can be intuitively and rapidly judged through the target lithium precipitation parameter, the nondestructive lithium precipitation detection efficiency can be improved, the time cost and the instrument cost are greatly reduced, and the safety of the battery can be optimized and improved through judgment on the lithium precipitation condition.
In accordance with the above embodiments, referring to fig. 3, fig. 3 is a schematic structural diagram of an electronic device provided in an embodiment of the present application, as shown in the fig. 3, which includes a processor, a memory, a communication interface, and one or more programs, where the one or more programs are stored in the memory and configured to be executed by the processor, and in the embodiment of the present application, the programs include instructions for performing the following steps:
Acquiring a first charge-discharge curve of a target lithium iron phosphate battery, wherein the first charge-discharge curve comprisesnA ring, saidnThe circle representation includesnSub-integrityIs used for the charge-discharge process of the battery,nis an integer greater than or equal to 2;
acquiring the first charge-discharge curve from the first charge-discharge curve
Second charge-discharge curve of the ring and the firstbThird charge-discharge curve of circle, +.>
，bAre all greater than or equal to 1 and less than or equal tonAnd->
Not equal tob；
Acquisition by the second charge-discharge curvePEach included angle slope corresponds to a platform type, and the platform type comprises any one of the following components: a first platform, a second platform and a third platform; the first platform is an initial platform for reaching charging, and the second platform is a stable charging platform, specifically: lithium ions pass through the diaphragm from the positive electrode to the platform on the surface of the negative electrode; the third platform is a platform for inserting lithium ions into gaps in the negative electrode graphite particles;Pis an integer greater than or equal to 1;
acquisition by the third charge-discharge curvePA second included angle slope and a second capacity value, saidPThe platform type of each included angle slope in the second included angle slopes and the included angle slopePThe platform types of each included angle slope of the first included angle slopes correspond one to one;
According to the describedPA first included angle slope and thePDetermining a target slope ratio by the second included angle slopes;
determining a target capacity ratio value according to the first capacity value and the second capacity value;
determining a target lithium precipitation parameter according to the target slope ratio and the target capacity ratio;
when the target lithium precipitation parameter is in a preset interval range, determining that lithium precipitation exists in the target lithium iron phosphate battery;
and when the target lithium precipitation parameter is not in the preset interval range, determining that the target lithium iron phosphate battery does not have lithium precipitation.
Optionally, in said step of providing a signal according to saidPA first included angle slope and thePIn determining a target slope ratio for a second included angle slope, the program comprising instructions for:
the saidPA first included angle slope and thePAnd (3) carrying out ratio on the included angle slopes with the same platform type in the second included angle slopes to obtain the target slope ratio, wherein the target slope ratio is specifically as follows: the target slope ratio is determined according to the following formula:
wherein ,
representing the target slope ratio,/->
Representing the->
The ring is provided with a plurality of grooves,brepresents the firstbCircle (S)>
Representing the->
First of the ringiThe slope of each included angle; />
Represents the first bFirst of the ringiThe slope of each included angle;Prepresenting the->
Total number of angular slopes of the circle.
Optionally, in said determining a target capacity ratio from said first capacity value and said second capacity value, the program comprises instructions for:
the target capacity ratio is determined according to the following formula, specifically:
wherein ,
representing the target capacity ratio,/->
Representing said first capacity value,/and->
Representing the second capacity value.
Optionally, the above program further comprises instructions for performing the steps of:
determining a target lithium analysis severity level corresponding to the target lithium analysis parameter according to a mapping relation between a preset ratio and the lithium analysis severity level;
determining a target optimization parameter corresponding to the target lithium analysis severity level;
adjusting the current charge and discharge parameters according to the target optimization parameters to obtain target charge and discharge parameters;
and controlling the target lithium iron phosphate battery to perform charge and discharge operation through the target charge and discharge parameters.
Optionally, the above program further comprises instructions for performing the steps of:
acquiring target attribute information corresponding to the target lithium iron phosphate battery;
determining a reference interval range corresponding to the target attribute information, wherein the reference interval range comprises an upper limit threshold value and a lower limit threshold value;
Acquiring a target service condition parameter of the target lithium iron phosphate battery;
determining a target adjustment parameter corresponding to the target use condition parameter;
adjusting the lower limit threshold according to the target adjustment parameter to obtain a target lower limit threshold;
and determining the preset interval range according to the target lower limit threshold and the upper limit threshold.
Fig. 4 is a functional block diagram of a nondestructive lithium-ion detection apparatus 400 for a lithium iron phosphate battery according to an embodiment of the present application, where the nondestructive lithium-ion detection apparatus 400 for a lithium iron phosphate battery is applied to an electronic device, and the nondestructive lithium-ion detection apparatus 400 for a lithium iron phosphate battery includes: a first acquisition unit 401, a second acquisition unit 402, a determination unit 403, and a detection unit 404, wherein,
the first obtaining unit 401 is configured to obtain a first charge-discharge curve of the target lithium iron phosphate battery, where the first charge-discharge curve includesnA ring, saidnThe circle representation includesnThe secondary complete charge-discharge process is carried out,nis an integer greater than or equal to 2; acquiring the first charge-discharge curve from the first charge-discharge curve
Second charge-discharge curve of the ring and the firstbThird charge-discharge curve of circle, +.>
，bAre all greater than or equal to 1 and less than or equal to nAnd->
Not equal tob；
The second acquiring unit 402 is configured to acquire through the second charge-discharge curvePEach included angle slope corresponds to a platform type, and the platform type comprises any one of the following components: a first platform, a second platform and a third platform; the first platform is an initial platform for reaching charging, and the second platform is a stable charging platform, specifically: lithium ions pass through the diaphragm from the positive electrode to the platform on the surface of the negative electrode; the third platform is a platform for inserting lithium ions into gaps in the negative electrode graphite particles;Pis an integer greater than or equal to 1; obtaining through the third charge-discharge curvePA second included angle slope and a second capacity value, saidPThe platform type of each included angle slope in the second included angle slopes and the included angle slopePThe platform types of each included angle slope of the first included angle slopes correspond one to one;
the determining unit 403 is configured to, according to thePA first included angle slope and thePDetermining a target slope ratio by the second included angle slopes; determining a target capacity ratio value according to the first capacity value and the second capacity value; determining a target lithium precipitation parameter according to the target slope ratio and the target capacity ratio;
The detecting unit 404 is configured to determine that lithium is separated from the target lithium iron phosphate battery when the target lithium separation parameter is within a preset interval range; and when the target lithium precipitation parameter is not in the preset interval range, determining that the target lithium iron phosphate battery does not have lithium precipitation.
Optionally, in said step of providing a signal according to saidPA first included angle slope and thePIn terms of determining the target slope ratio for the second included angle slope, the determining unit 403 is specifically configured to:
and comparing the included angle slopes with the same type of platform in the P first included angle slopes and the P second included angle slopes to obtain the target slope ratio, wherein the target slope ratio is specifically as follows: the target slope ratio is determined according to the following formula:
wherein ,
representing the target slope ratio,/->
Representing the->
The ring is provided with a plurality of grooves,brepresents the firstbCircle (S)>
Representing the->
First of the ringiThe slope of each included angle; />
Represents the firstbFirst of the ringiThe slope of each included angle;Prepresenting the->
Total number of angular slopes of the circle.
Optionally, in the aspect of determining the target capacity ratio according to the first capacity value and the second capacity value, the determining unit 403 is specifically configured to:
the target capacity ratio is determined according to the following formula, specifically:
wherein ,
representing the target capacity ratio,/->
Representing said first capacity value,/and->
Representing the second capacity value.
Optionally, the non-destructive lithium analysis detection device 400 of the lithium iron phosphate battery is specifically further configured to:
determining a target lithium analysis severity level corresponding to the target lithium analysis parameter according to a mapping relation between a preset ratio and the lithium analysis severity level;
determining a target optimization parameter corresponding to the target lithium analysis severity level;
adjusting the current charge and discharge parameters according to the target optimization parameters to obtain target charge and discharge parameters;
and controlling the target lithium iron phosphate battery to perform charge and discharge operation through the target charge and discharge parameters.
Optionally, the non-destructive lithium analysis detection device 400 of the lithium iron phosphate battery is specifically further configured to:
acquiring target attribute information corresponding to the target lithium iron phosphate battery;
determining a reference interval range corresponding to the target attribute information, wherein the reference interval range comprises an upper limit threshold value and a lower limit threshold value;
acquiring a target service condition parameter of the target lithium iron phosphate battery;
determining a target adjustment parameter corresponding to the target use condition parameter;
adjusting the lower limit threshold according to the target adjustment parameter to obtain a target lower limit threshold;
And determining the preset interval range according to the target lower limit threshold and the upper limit threshold.
It can be seen that the nondestructive lithium analysis detection device for lithium iron phosphate battery described in the embodiments of the present application is applied to an electronic device, and obtains a first charge-discharge curve of a target lithium iron phosphate battery, where the first charge-discharge curve includesnThe ring is provided with a plurality of grooves,nthe circle representation includesnThe secondary complete charge-discharge process is carried out,nobtaining the first charge-discharge curve from the first charge-discharge curve for an integer greater than or equal to 2
Second charge-discharge curve of the ring and the firstbThird charge-discharge curve of circle, +.>
，bAre all greater than or equal to 1 and less than or equal tonAnd->
Not equal tobObtaining through a second charge-discharge curvePEach first included angle slope corresponds to a platform type, and the platform type comprises any one of the following components: a first platform, a second platform and a third platform; the first platform is an initial platform for reaching charging, and the second platform is a stable charging platform, specifically: lithium ion secondary positive electrodeA stage where the electrode passes through the separator to reach the surface of the negative electrode; the third platform is a platform for lithium ions to be intercalated into gaps in the negative graphite particles;Pis an integer greater than or equal to 1, and is obtained through a third charge-discharge curve PA second angle slope and a second capacity value,Pplatform type and each included angle slope in the second included angle slopesPThe platform type of each included angle slope of the first included angle slopes corresponds to each other one by one according toPSlope of first included anglePThe second included angle slope determines a target slope ratio, a target capacity ratio is determined according to the first capacity value and the second capacity value, a target lithium precipitation parameter is determined according to the target slope ratio and the target capacity ratio, when the target lithium precipitation parameter is in a preset interval range, the existence of lithium precipitation of the target lithium iron phosphate battery is determined, when the target lithium precipitation parameter is not in the preset interval range, the absence of lithium precipitation of the target lithium iron phosphate battery is determined, further, the lithium precipitation condition can be intuitively and rapidly judged through the target lithium precipitation parameter, the nondestructive lithium precipitation detection efficiency can be improved, the time cost and the instrument cost are greatly reduced, and the safety of the battery can be optimized and improved through judgment on the lithium precipitation condition.
It can be understood that the functions of each program module of the non-analysis lithium detection device for a lithium iron phosphate battery in this embodiment may be specifically implemented according to the method in the foregoing method embodiment, and the specific implementation process may refer to the relevant description of the foregoing method embodiment, which is not repeated herein.
The embodiment of the application also provides a computer storage medium, where the computer storage medium stores a computer program for electronic data exchange, where the computer program causes a computer to execute part or all of the steps of any one of the methods described in the embodiments of the method, where the computer includes an electronic device.
Embodiments of the present application also provide a computer program product comprising a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of any one of the methods described in the method embodiments above. The computer program product may be a software installation package, said computer comprising an electronic device.
It should be noted that, for simplicity of description, the foregoing method embodiments are all expressed as a series of action combinations, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required in the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, such as the above-described division of units, merely a division of logic functions, and there may be additional manners of dividing in actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, or may be in electrical or other forms.
The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units described above, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a memory, including several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the above-mentioned method of the various embodiments of the present application. And the aforementioned memory includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of the above embodiments may be implemented by a program that instructs associated hardware, and the program may be stored in a computer readable memory, which may include: flash disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.
The foregoing has outlined rather broadly the more detailed description of embodiments of the present application, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, the above examples being provided solely to assist in the understanding of the methods of the present application and the core ideas thereof; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (10)
1. A method for non-destructive lithium analysis detection of a lithium iron phosphate battery, characterized in that it is applied to an electronic device, said method comprising:
acquiring a first charge-discharge curve of a target lithium iron phosphate battery, wherein the first charge-discharge curve comprises nA ring, saidnThe circle representation includesnThe secondary complete charge-discharge process is carried out,nis an integer greater than or equal to 2;
acquiring the first charge-discharge curve from the first charge-discharge curve
Second charge-discharge curve of the ring and the firstbA third charge-discharge curve of the circle,
，bare all greater than or equal to 1 and less than or equal tonAnd->
Not equal tob；
Acquisition by the second charge-discharge curvePEach included angle slope corresponds to a platform type, and the platform type comprises any one of the following components: a first platform, a second platform and a third platform; the first platform is an initial platform for reaching charging, and the second platform is a stable charging platform, specifically: lithium ions pass through the diaphragm from the positive electrode to the platform on the surface of the negative electrode; the third platform is a platform for inserting lithium ions into gaps in the negative electrode graphite particles;Pis an integer greater than or equal to 1;
acquisition by the third charge-discharge curvePA second included angle slope and a second capacity value, saidPThe platform type of each included angle slope in the second included angle slopes and the included angle slopePThe platform types of each included angle slope of the first included angle slopes correspond one to one;
according to the describedPA first included angle slope and the PDetermining a target slope ratio by the second included angle slopes;
determining a target capacity ratio value according to the first capacity value and the second capacity value;
determining a target lithium precipitation parameter according to the target slope ratio and the target capacity ratio;
when the target lithium precipitation parameter is in a preset interval range, determining that lithium precipitation exists in the target lithium iron phosphate battery;
and when the target lithium precipitation parameter is not in the preset interval range, determining that the target lithium iron phosphate battery does not have lithium precipitation.
2. The method according to claim 1, wherein said step ofPA first included angle slope and thePDetermining a target slope ratio for each second included angle slope, comprising:
the saidPA first included angle slope and thePAnd (3) carrying out ratio on the included angle slopes with the same platform type in the second included angle slopes to obtain the target slope ratio, wherein the target slope ratio is specifically as follows: the target slope ratio is determined according to the following formula:
wherein ,
representing the target slope ratio,/->
Representing the->
The ring is provided with a plurality of grooves,brepresents the firstbCircle (S)>
Representing the->
First of the ringiThe slope of each included angle; />
Represents the firstbFirst of the ringiThe slope of each included angle;Prepresenting the->
Total number of angular slopes of the circle.
3. The method of claim 2, wherein said determining a target capacity ratio from said first capacity value and said second capacity value comprises:
the target capacity ratio is determined according to the following formula, specifically:
wherein ,
representing the target capacity ratio,/->
Representing said first capacity value,/and->
Representing the second capacity value. />
4. A method according to any one of claims 1-3, wherein the method further comprises:
determining a target lithium analysis severity level corresponding to the target lithium analysis parameter according to a mapping relation between a preset ratio and the lithium analysis severity level;
determining a target optimization parameter corresponding to the target lithium analysis severity level;
adjusting the current charge and discharge parameters according to the target optimization parameters to obtain target charge and discharge parameters;
and controlling the target lithium iron phosphate battery to perform charge and discharge operation through the target charge and discharge parameters.
5. A method according to any one of claims 1-3, wherein the method further comprises:
acquiring target attribute information corresponding to the target lithium iron phosphate battery;
determining a reference interval range corresponding to the target attribute information, wherein the reference interval range comprises an upper limit threshold value and a lower limit threshold value;
Acquiring a target service condition parameter of the target lithium iron phosphate battery;
determining a target adjustment parameter corresponding to the target use condition parameter;
adjusting the lower limit threshold according to the target adjustment parameter to obtain a target lower limit threshold;
and determining the preset interval range according to the target lower limit threshold and the upper limit threshold.
6. A non-destructive lithium detection device for a lithium iron phosphate battery, for use in an electronic device, the device comprising: a first acquisition unit, a second acquisition unit, a determination unit and a detection unit, wherein,
the first obtaining unit is configured to obtain a first charge-discharge curve of a target lithium iron phosphate battery, where the first charge-discharge curve includesnA ring, saidnThe circle representation includesnThe secondary complete charge-discharge process is carried out,nis an integer greater than or equal to 2; acquiring a first charge-discharge curve from the first charge-discharge curve
Second charge-discharge curve of the ring and the firstbThird charge-discharge curve of circle, +.>
，bAre all greater than or equal to 1 and less than or equal tonAnd->
Not equal tob；
The second acquisition unit is configured to acquire a second data stream,for obtaining through the second charge-discharge curvePEach included angle slope corresponds to a platform type, and the platform type comprises any one of the following components: a first platform, a second platform and a third platform; the first platform is an initial platform for reaching charging, and the second platform is a stable charging platform, specifically: lithium ions pass through the diaphragm from the positive electrode to the platform on the surface of the negative electrode; the third platform is a platform for inserting lithium ions into gaps in the negative electrode graphite particles; PIs an integer greater than or equal to 1; obtaining through the third charge-discharge curvePA second included angle slope and a second capacity value, saidPThe platform type of each included angle slope in the second included angle slopes and the included angle slopePThe platform types of each included angle slope of the first included angle slopes correspond one to one;
the determining unit is used for according to thePA first included angle slope and thePDetermining a target slope ratio by the second included angle slopes; determining a target capacity ratio value according to the first capacity value and the second capacity value; determining a target lithium precipitation parameter according to the target slope ratio and the target capacity ratio;
the detection unit is used for determining that the target lithium iron phosphate battery has lithium precipitation when the target lithium precipitation parameter is in a preset interval range; and when the target lithium precipitation parameter is not in the preset interval range, determining that the target lithium iron phosphate battery does not have lithium precipitation.
7. The apparatus according to claim 6, wherein, in said step of providing said informationPA first included angle slope and thePThe determining unit is specifically configured to:
and comparing the included angle slopes with the same type of platform in the P first included angle slopes and the P second included angle slopes to obtain the target slope ratio, wherein the target slope ratio is specifically as follows: the target slope ratio is determined according to the following formula:
wherein ,
representing the target slope ratio,/->
Representing the->
The ring is provided with a plurality of grooves,brepresents the firstbCircle (S)>
Representing the->
First of the ringiThe slope of each included angle; />
Represents the firstbFirst of the ringiThe slope of each included angle;Prepresenting the->
Total number of angular slopes of the circle.
8. The apparatus according to claim 7, wherein in said determining a target capacity ratio from said first capacity value and said second capacity value, said determining unit is specifically configured to:
the target capacity ratio is determined according to the following formula, specifically:
wherein ,
representing the target capacity ratio,/->
Representing said first capacity value,/and->
Representing the second capacity value.
9. An electronic device comprising a processor, a memory for storing one or more programs and configured to be executed by the processor, the programs comprising instructions for performing the steps in the method of any of claims 1-5.
10. A computer-readable storage medium, characterized in that a computer program for electronic data exchange is stored, wherein the computer program causes a computer to perform the method according to any one of claims 1-5.
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