CN114200324B - Lithium iron phosphate battery sorting method, device, equipment and storage medium - Google Patents
Lithium iron phosphate battery sorting method, device, equipment and storage medium Download PDFInfo
- Publication number
- CN114200324B CN114200324B CN202111518359.4A CN202111518359A CN114200324B CN 114200324 B CN114200324 B CN 114200324B CN 202111518359 A CN202111518359 A CN 202111518359A CN 114200324 B CN114200324 B CN 114200324B
- Authority
- CN
- China
- Prior art keywords
- iron phosphate
- lithium iron
- sorted
- batteries
- phosphate batteries
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 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 255
- 238000000034 method Methods 0.000 title claims abstract description 111
- 238000007599 discharging Methods 0.000 claims abstract description 66
- 238000012216 screening Methods 0.000 claims abstract description 16
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 8
- 229910052744 lithium Inorganic materials 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003064 k means clustering Methods 0.000 description 1
- 238000010801 machine learning Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a lithium iron phosphate battery sorting method, a device, equipment and a storage medium, which comprise the following steps: obtaining lithium iron phosphate batteries in the same batch, and screening out the lithium iron phosphate batteries to be sorted which meet preset requirements; pulse discharging is carried out on the lithium iron phosphate batteries to be sorted by adopting a first current, and the internal resistance of the lithium iron phosphate batteries to be sorted is calculated according to a first discharging process; constant-current discharging is carried out on the lithium iron phosphate batteries to be sorted by adopting the second current, and the voltage and temperature change of the lithium iron phosphate batteries to be sorted in the second discharging process are recorded; and sorting the lithium iron phosphate batteries to be sorted by a preset method according to the internal resistance, the voltage and the temperature change. According to the lithium iron phosphate battery sorting method provided by the invention, the lithium iron phosphate battery is discharged twice, the parameter change is recorded, the lithium iron phosphate battery is sorted, the initial state of the lithium iron phosphate battery is subjected to the uniform treatment, the consistency of the battery is good, a plurality of parameters are selected, and the sorting accuracy is high.
Description
Technical Field
The invention relates to the technical field of sorting of lithium iron phosphate batteries, in particular to a method, a device and equipment for sorting lithium iron phosphate batteries and a storage medium.
Background
The consistency of the lithium battery cells is critical to the power battery pack. Because the parameter values of the lithium batteries of the same type and specification in the aspects of voltage, internal resistance, capacity and the like are different, when the lithium batteries are used on electric automobiles, performance indexes often cannot reach the original level of single batteries, the application of the lithium batteries on the electric automobiles is seriously influenced, and the consistency of battery parameters becomes a key factor influencing the service life of battery packs. Therefore, lithium battery sorting is an important process for automatic production of battery cells.
The traditional lithium battery sorting method needs to comprehensively evaluate parameters such as battery capacity, internal resistance, self-discharge rate and the like, and then screens out single batteries within the range meeting the standard requirements. In the prior art, the offline capacity test and the alternating current internal resistance test are required to be carried out on single batteries in the same batch. The screened single batteries meeting the requirements of capacity and internal resistance are subjected to capacity division and grading. Secondly, detecting that the single battery with the self-discharge abnormality exists by a high-temperature accelerated aging method, and screening the single battery. And finally, the direct current internal resistance standard range of the battery is established by sampling the direct current internal resistance of the single battery in the batch.
The measurement method of the direct current internal resistance in the prior art has high accuracy, but the measurement procedure is complex. However, sampling detection of the direct current internal resistance of the lithium battery is easy to mix the lithium battery with larger consistency difference into the battery module and/or the battery system, so that the performance of the battery module and/or the battery system is affected, the sorting accuracy is low, and even safety problems are caused.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a method, a device and a storage medium for sorting lithium iron phosphate batteries, which are used for solving the problems of poor consistency and low accuracy of sorting lithium iron phosphate batteries in the prior art.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for sorting lithium iron phosphate batteries, comprising:
obtaining lithium iron phosphate batteries in the same batch, and screening out the lithium iron phosphate batteries to be sorted which meet preset requirements;
pulse discharging is carried out on the lithium iron phosphate batteries to be sorted by adopting a first current, and the internal resistance of the lithium iron phosphate batteries to be sorted is calculated according to a first discharging process;
constant-current discharging is carried out on the lithium iron phosphate batteries to be sorted by adopting the second current, and the voltage and temperature change of the lithium iron phosphate batteries to be sorted in the second discharging process are recorded;
and sorting the lithium iron phosphate batteries to be sorted by a preset method according to the internal resistance, the voltage and the temperature change.
Preferably, pulse discharge is performed on the lithium iron phosphate battery to be sorted by adopting a first current, and the internal resistance of the lithium iron phosphate battery to be sorted is calculated according to a first discharge process, and the method comprises the following steps:
pulse discharging is carried out on the lithium iron phosphate batteries to be sorted by adopting a first current, and the voltage change of the lithium iron phosphate batteries in the discharging process is recorded;
and calculating the internal resistance of the lithium iron phosphate battery to be sorted according to the voltage change of the lithium iron phosphate battery to be sorted.
Preferably, the voltage change of the lithium iron phosphate battery in the discharging process is recorded, wherein the voltage change comprises terminal voltage before and after the discharging of the lithium iron phosphate battery is started and terminal voltage before the discharging is stopped; according to the voltage change of the lithium iron phosphate batteries to be sorted, calculating the internal resistance of the lithium iron phosphate batteries to be sorted, including:
according to terminal voltage before and after the discharge of the lithium iron phosphate battery to be sorted and the first current, ohmic internal resistance of the lithium iron phosphate battery to be sorted is calculated;
and calculating the polarized internal resistance of the lithium iron phosphate battery to be sorted according to the terminal voltage of the lithium iron phosphate battery to be sorted after discharge, the terminal voltage of the lithium iron phosphate battery before discharge cut-off and the first current.
Preferably, the constant current discharge is carried out on the lithium iron phosphate battery to be sorted by adopting the second current, and the voltage and the temperature change of the lithium iron phosphate battery to be sorted in the second discharge process are recorded, and the method comprises the following steps:
recording the voltage and temperature change of a discharge platform of the lithium iron phosphate battery to be sorted in the second discharge process;
and after constant-current discharge is carried out on the lithium iron phosphate batteries to be sorted by adopting the second current, standing for preset time, and recording the terminal voltage of the lithium iron phosphate batteries to be sorted.
Preferably, the method for obtaining the lithium iron phosphate batteries in the same batch and screening the lithium iron phosphate batteries to be sorted meeting the preset requirement comprises the following steps: and screening the appearance of the lithium iron phosphate batteries in the same batch, and eliminating the lithium iron phosphate batteries with the appearance which does not meet the preset requirement to obtain the lithium iron phosphate batteries to be sorted.
Preferably, sorting lithium iron phosphate batteries to be sorted by a preset method according to the internal resistance, voltage and temperature change comprises the following steps: and taking the internal resistance, the voltage and the temperature change as input, and obtaining the sorted groups of the lithium iron phosphate batteries through a preset method.
Preferably, the sorting of the lithium iron phosphate batteries to be sorted is performed by a preset method according to the internal resistance, the voltage and the temperature change, and the method further comprises:
and according to a preset method, carrying out iterative combination on input data meeting preset similarity in input, and obtaining a final sorting result of the lithium iron phosphate battery to be sorted when an iteration termination condition is reached.
In a second aspect, the present invention also provides a lithium iron phosphate battery sorting apparatus, including:
the screening module is used for obtaining the lithium iron phosphate batteries in the same batch, and screening out the lithium iron phosphate batteries to be sorted which meet the preset requirement;
the first discharging module is used for carrying out pulse discharging on the lithium iron phosphate batteries to be sorted by adopting a first current, and calculating the internal resistance of the lithium iron phosphate batteries to be sorted according to a first discharging process;
the second discharging module is used for performing constant-current discharging on the lithium iron phosphate batteries to be sorted by adopting a second current and recording the voltage and temperature change of the lithium iron phosphate batteries to be sorted in the second discharging process;
and the sorting module is used for sorting the lithium iron phosphate batteries to be sorted according to the internal resistance, the voltage and the temperature change by a preset method.
In a third aspect, the invention also provides an electronic device comprising a memory and a processor, wherein,
a memory for storing a program;
and the processor is coupled with the memory and is used for executing the program stored in the memory so as to realize the steps in the lithium iron phosphate battery sorting method in any implementation mode.
In a fourth aspect, the present invention also provides a computer readable storage medium, configured to store a computer readable program or instructions, where the program or instructions, when executed by a processor, implement the steps in the lithium iron phosphate battery sorting method in any of the above implementations.
The beneficial effects of adopting the embodiment are as follows: according to the method, the device, the equipment and the storage medium for sorting the lithium iron phosphate batteries, firstly, the appearance of the lithium iron phosphate batteries is screened, the undesirable lithium iron phosphate batteries are eliminated, then, two different currents are selected to discharge the qualified lithium iron phosphate batteries successively, parameter changes in the discharging process are recorded, various characteristic parameters are obtained according to the parameter changes, the lithium iron phosphate batteries are sorted through the various characteristic parameters, consistency treatment is carried out on the lithium iron phosphate batteries, the consistency of the batteries is good, the various characteristic parameters are selected to be sorted, and the sorting accuracy is high.
Drawings
Fig. 1 is a schematic flow chart of an embodiment of a sorting method for lithium iron phosphate batteries according to the present invention;
FIG. 2 is a flowchart illustrating an embodiment of a hierarchical clustering algorithm according to the present invention;
fig. 3 is a schematic structural diagram of an embodiment of a sorting device for lithium iron phosphate batteries according to the present invention;
fig. 4 is a schematic structural diagram of a lithium iron phosphate battery sorting electronic device according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended to limit the scope of the invention.
In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
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 invention. 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.
The invention provides a lithium iron phosphate battery sorting method, a lithium iron phosphate battery sorting device, a lithium iron phosphate battery sorting equipment and a storage medium, and the lithium iron phosphate battery sorting method, the lithium iron phosphate battery sorting device and the storage medium are respectively described below.
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a sorting method for lithium iron phosphate batteries, and a specific embodiment of the invention discloses a sorting method for lithium iron phosphate batteries, which comprises the following steps:
s101, obtaining lithium iron phosphate batteries in the same batch, and screening out the lithium iron phosphate batteries to be sorted which meet preset requirements;
s102, pulse discharging is carried out on the lithium iron phosphate batteries to be sorted by adopting a first current, and the internal resistance of the lithium iron phosphate batteries to be sorted is calculated according to a first discharging process;
s103, performing constant-current discharge on the lithium iron phosphate batteries to be sorted by adopting a second current, and recording the voltage and temperature change of the lithium iron phosphate batteries to be sorted in the second discharge process;
s104, sorting the lithium iron phosphate batteries to be sorted according to the internal resistance, the voltage and the temperature change by a preset method.
In step S101, the lithium iron phosphate batteries of the same batch are obtained first, so that the sorting effect of the lithium iron phosphate batteries of the same batch is better, and the reference value is high.
In step S102, pulse discharging is performed on the qualified lithium iron phosphate batteries to be sorted meeting the preset requirements by adopting a first current, meanwhile, the voltage change condition of the lithium iron phosphate batteries is recorded, and the internal resistance of the lithium iron phosphate batteries is calculated according to the voltage change condition of the lithium iron phosphate batteries in the first current discharging process, wherein the obtained internal resistance of the lithium iron phosphate batteries is a characteristic parameter of the lithium iron phosphate batteries.
In step S103, constant current discharge is continuously performed on the lithium iron phosphate battery through the second current, and meanwhile, the voltage and temperature change conditions of the lithium iron phosphate battery in the second discharge process are recorded, wherein the voltage and temperature change conditions of the lithium iron phosphate battery are also characteristic parameters of the lithium iron phosphate battery.
In step S104, the characteristic parameters of the lithium iron phosphate batteries obtained in steps S102 and S103 are used as input, and the lithium iron phosphate batteries to be sorted are sorted by a preset method, so that a final sorting result of the lithium iron phosphate batteries is obtained.
Compared with the prior art, the method, the device, the equipment and the storage medium for sorting the lithium iron phosphate batteries provided by the embodiment screen the appearance of the lithium iron phosphate batteries, eliminate the undesirable lithium iron phosphate batteries, select two different currents to discharge the qualified lithium iron phosphate batteries successively, record the parameter change in the discharging process, obtain various characteristic parameters according to the parameter change, sort the lithium iron phosphate batteries through the various characteristic parameters, perform consistency treatment on the lithium iron phosphate batteries, have good consistency of the batteries, select various characteristic parameters for approval, and have high sorting accuracy.
In some embodiments of the present invention, pulse discharging is performed on lithium iron phosphate batteries to be sorted by using a first current, and internal resistance of the lithium iron phosphate batteries to be sorted is calculated according to a first discharging process, including:
pulse discharging is carried out on the lithium iron phosphate batteries to be sorted by adopting a first current, and the voltage change of the lithium iron phosphate batteries in the discharging process is recorded;
and calculating the internal resistance of the lithium iron phosphate battery to be sorted according to the voltage change of the lithium iron phosphate battery to be sorted.
In the above embodiment, the first current is 3C to 5C, the voltage change condition of the lithium iron phosphate battery during the discharging process is recorded by establishing a coordinate curve, the discharging time is taken as the abscissa, and the voltage of the lithium iron phosphate battery is taken as the ordinate, and a coordinate system is established. And calculating the internal resistance of the lithium iron phosphate battery to be sorted according to the voltage change of the lithium iron phosphate battery to be sorted and the ohm law.
It can be understood that the time for discharging the lithium iron phosphate battery to be sorted by adopting the first current has a certain limit, the discharging time of this embodiment is 10-30 seconds, and in addition, after the discharging is finished, the lithium iron phosphate battery to be sorted needs to be kept stand for 1 minute.
In some embodiments of the invention, the voltage change of the lithium iron phosphate battery during the discharging process is recorded, wherein the voltage change comprises the terminal voltage before and after the discharging of the lithium iron phosphate battery starts and the terminal voltage before the discharging stops; according to the voltage change of the lithium iron phosphate batteries to be sorted, calculating the internal resistance of the lithium iron phosphate batteries to be sorted, including:
according to terminal voltage before and after the discharge of the lithium iron phosphate battery to be sorted and the first current, ohmic internal resistance of the lithium iron phosphate battery to be sorted is calculated;
and calculating the polarized internal resistance of the lithium iron phosphate battery to be sorted according to the terminal voltage of the lithium iron phosphate battery to be sorted after discharge, the terminal voltage of the lithium iron phosphate battery before discharge cut-off and the first current.
In the above embodiment, the terminal voltage change before and after the start of the discharge of the lithium iron phosphate battery is related to the ohmic internal resistance of the lithium iron phosphate battery, the first current is a manually set current, the current value I is known, the terminal voltages V1 and V2 before and after the start of the discharge of the lithium iron phosphate battery are measured, and the ohmic internal resistance r1= (V1-V2)/I of the lithium iron phosphate battery can be calculated through ohm's law; and similarly, measuring the terminal voltage V3 before the discharge of the lithium iron phosphate battery is cut off, and calculating the polarized internal resistance R2= (V2-V3)/I of the lithium iron phosphate battery through ohm's law.
In some embodiments of the present invention, constant current discharging is performed on the lithium iron phosphate battery to be sorted by using a second current, and the voltage and the temperature change of the lithium iron phosphate battery to be sorted in the second discharging process are recorded, including:
recording the voltage and temperature change of a discharge platform of the lithium iron phosphate battery to be sorted in the second discharge process;
and after constant-current discharge is carried out on the lithium iron phosphate batteries to be sorted by adopting the second current, standing for preset time, and recording the terminal voltage of the lithium iron phosphate batteries to be sorted.
In the above embodiment, the second current is 0.3C-1C, the electric quantity of the lithium iron phosphate battery is taken as the abscissa, the voltage of the lithium iron phosphate battery is taken as the ordinate to establish a coordinate system, and the voltage change of the lithium iron phosphate battery in the second discharging process is recorded; and establishing a coordinate system by taking the electric quantity of the lithium iron phosphate battery as an abscissa and the temperature of the lithium iron phosphate battery as an ordinate, and recording the temperature change condition of the lithium iron phosphate battery in the second discharging process.
In the second discharging process, the SOC of the lithium iron phosphate battery to be sorted is reduced by 10-25% on the basis of the first discharging, so that the requirement of the second discharging is met.
In some embodiments of the present invention, obtaining the same batch of lithium iron phosphate batteries, and screening the lithium iron phosphate batteries to be sorted from the lithium iron phosphate batteries to meet the preset requirement, including: and screening the appearance of the lithium iron phosphate batteries in the same batch, and eliminating the lithium iron phosphate batteries with the appearance which does not meet the preset requirement to obtain the lithium iron phosphate batteries to be sorted.
In the above embodiment, the preset requirement is that the lithium iron phosphate battery does not have deformation, bulge, damage, leakage, serious corrosion and other conditions, and the lithium iron phosphate battery which does not meet the preset requirement in the same batch of lithium iron phosphate batteries is eliminated, so as to obtain a plurality of qualified lithium iron phosphate batteries to be sorted.
In some embodiments of the present invention, sorting lithium iron phosphate batteries to be sorted by a preset method according to internal resistance, voltage and temperature changes, includes: and taking the internal resistance, the voltage and the temperature change as input, and obtaining the sorted groups of the lithium iron phosphate batteries through a preset method.
In the above embodiment, the ohmic internal resistance, the polarized internal resistance, the terminal voltage after the second round of discharge, the platform voltage of the second round of discharge and the temperature change in the second round of discharge process of the lithium iron phosphate battery to be sorted are taken as the characteristic parameters, the characteristic parameters are taken as the input of a preset method, the lithium iron phosphate battery to be sorted is sorted by the preset method, and finally the sorted lithium iron phosphate battery is grouped.
In some embodiments of the present invention, sorting lithium iron phosphate batteries to be sorted by a preset method according to internal resistance, voltage and temperature changes, further includes:
and according to a preset method, carrying out iterative combination on input data meeting preset similarity in input, and obtaining a final sorting result of the lithium iron phosphate battery to be sorted when an iteration termination condition is reached.
In the above embodiment, the preset method is a clustering algorithm based on machine learning, and it can be understood that the clustering algorithm may be a K-means clustering algorithm, a fuzzy C-means algorithm, or the like, and in this embodiment, the hierarchical clustering algorithm is selected to sort lithium iron phosphate batteries. Referring to fig. 2, fig. 2 is a flowchart of an embodiment of a hierarchical clustering algorithm provided by the present invention, and the specific process is as follows:
s201, taking one battery as one sample, classifying each sample into one group, and calculating the distance between the two groups, namely the similarity between the samples;
s202, classifying high similarity into a group according to characteristic parameters in different samples, and setting a threshold value;
s203, recalculating the distance between the newly generated group and each old group;
s204, repeating the step S202 and the step S203 until the distance divided into the two nearest groups is larger than a set threshold value, and ending the iteration.
It should be noted that, the distance between the groups is the absolute value difference between the groups, and the consistency of the single batteries is judged according to the absolute value difference between the relevant characteristic parameters (internal resistance, voltage and temperature) of the batteries, the single batteries are divided into a group with good consistency, the distance between the newly generated group and the old group is recalculated until the absolute value difference is greater than the set threshold value, and the iteration is finished.
In order to better implement the sorting method of lithium iron phosphate according to the embodiment of the present invention, referring to fig. 3 correspondingly on the basis of the sorting method of lithium iron phosphate, fig. 3 is a schematic structural diagram of an embodiment of a sorting device of lithium iron phosphate according to the present invention, and the embodiment of the present invention provides a sorting device 300 of lithium iron phosphate, including:
the screening module 301 is configured to obtain lithium iron phosphate batteries of the same batch, and screen out lithium iron phosphate batteries to be sorted from the lithium iron phosphate batteries to meet a preset requirement;
the first discharging module 302 is configured to perform pulse discharging on the lithium iron phosphate battery to be sorted by using a first current, and calculate the internal resistance of the lithium iron phosphate battery to be sorted according to a first discharging process;
the second discharging module 303 is configured to perform constant current discharging on the lithium iron phosphate battery to be sorted by using a second current, and record a voltage and a temperature change of the lithium iron phosphate battery to be sorted in the second discharging process;
and the sorting module 304 is used for sorting the lithium iron phosphate batteries to be sorted according to the internal resistance, the voltage and the temperature change by a preset method.
What needs to be explained here is: the device 300 provided in the foregoing embodiments may implement the technical solutions described in the foregoing method embodiments, and the specific implementation principles of the foregoing modules or units may be referred to the corresponding content in the foregoing method embodiments, which is not described herein again.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a lithium iron phosphate battery sorting electronic device according to an embodiment of the invention. Based on the above-mentioned lithium iron phosphate battery sorting method, the invention also provides a lithium iron phosphate battery sorting device, which can be a mobile terminal, a desktop computer, a notebook computer, a palm computer, a server and other computing devices. The lithium iron phosphate battery sorting apparatus includes a processor 410, a memory 420, and a display 430. Fig. 4 shows only some of the components of the electronic device, but it should be understood that not all of the illustrated components are required to be implemented and that more or fewer components may be implemented instead.
The memory 420 may be an internal storage unit of the lithium iron phosphate battery sorting device in some embodiments, such as a hard disk or memory of the lithium iron phosphate battery sorting device. The memory 420 may also be an external storage device of the lithium iron phosphate battery sorting device, such as a plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash memory Card (Flash Card) or the like, which are provided on the lithium iron phosphate battery sorting device in other embodiments. Further, the memory 420 may also include both internal and external memory units of the lithium iron phosphate battery sorting apparatus. The memory 420 is used for storing application software installed on the lithium iron phosphate battery sorting device and various data, such as program codes for installing the lithium iron phosphate battery sorting device. The memory 420 may also be used to temporarily store data that has been output or is to be output. In one embodiment, the memory 420 stores a lithium iron phosphate battery sorting program 440, and the lithium iron phosphate battery sorting program 440 is executable by the processor 410 to implement the lithium iron phosphate battery sorting method according to the embodiments of the present application.
The processor 410 may in some embodiments be a central processing unit (Central Processing Unit, CPU), microprocessor or other data processing chip for executing program code or processing data stored in the memory 420, such as performing lithium iron phosphate battery sorting methods, etc.
The display 430 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch, or the like in some embodiments. The display 430 is used to display information at the lithium iron phosphate battery sorting equipment and to display a visual user interface. The components 410-430 of the lithium iron phosphate battery sorting apparatus communicate with each other over a system bus.
In one embodiment, the steps in the lithium iron phosphate battery sorting method as described above are implemented when the processor 410 executes the lithium iron phosphate battery sorting program 440 in the memory 420.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. A lithium iron phosphate battery sorting method, characterized by comprising the following steps:
obtaining lithium iron phosphate batteries in the same batch, and screening out the lithium iron phosphate batteries to be sorted which meet preset requirements;
pulse discharging is carried out on the lithium iron phosphate batteries to be sorted by adopting a first current, and the internal resistance of the lithium iron phosphate batteries to be sorted is calculated according to a first discharging process;
constant-current discharging is carried out on the lithium iron phosphate batteries to be sorted by adopting the second current, and the voltage and temperature change of the lithium iron phosphate batteries to be sorted in the second discharging process are recorded;
sorting the lithium iron phosphate batteries to be sorted by a preset method according to the internal resistance, the voltage and the temperature change;
the method for sorting the lithium iron phosphate batteries to be sorted according to the internal resistance, the voltage and the temperature change by a preset method comprises the following steps: taking the internal resistance, the voltage and the temperature change as input, and obtaining sorting groups of lithium iron phosphate batteries through a preset method;
wherein, according to internal resistance, voltage and temperature variation, sorting lithium iron phosphate batteries to be sorted by a preset method, further comprising:
according to a preset method, carrying out iterative combination on input data meeting preset similarity in input, and obtaining a final sorting result of the lithium iron phosphate battery to be sorted when an iteration termination condition is reached;
the preset method is a hierarchical clustering algorithm, and the lithium iron phosphate battery is sorted according to the hierarchical clustering algorithm, and the specific process is as follows:
s201, taking one battery as one sample, classifying each sample into one group, and calculating the distance between the two groups, namely the similarity between the samples;
s202, classifying high similarity into a group according to characteristic parameters in different samples, and setting a threshold value;
s203, recalculating the distance between the newly generated group and each old group;
s204, repeating the step S202 and the step S203 until the distance divided into the two nearest groups is larger than a set threshold value, and ending the iteration;
the distance between groups is the absolute value difference of the related characteristic parameters of the batteries between the groups, and the related characteristic parameters are internal resistance, voltage and temperature.
2. The method for sorting lithium iron phosphate batteries according to claim 1, wherein the pulse discharging of the lithium iron phosphate batteries to be sorted is performed by using a first current, and the internal resistance of the lithium iron phosphate batteries to be sorted is calculated according to the first discharging process, comprising:
pulse discharging is carried out on the lithium iron phosphate batteries to be sorted by adopting a first current, and the voltage change of the lithium iron phosphate batteries in the discharging process is recorded;
and calculating the internal resistance of the lithium iron phosphate battery to be sorted according to the voltage change of the lithium iron phosphate battery to be sorted.
3. The lithium iron phosphate battery sorting method according to claim 2, characterized in that the voltage change of the lithium iron phosphate battery during the discharge is recorded, including the terminal voltage before and after the start of the discharge of the lithium iron phosphate battery and the terminal voltage before the discharge cut-off; according to the voltage change of the lithium iron phosphate batteries to be sorted, calculating the internal resistance of the lithium iron phosphate batteries to be sorted, including:
according to terminal voltage before and after the discharge of the lithium iron phosphate battery to be sorted and the first current, ohmic internal resistance of the lithium iron phosphate battery to be sorted is calculated;
and calculating the polarized internal resistance of the lithium iron phosphate battery to be sorted according to the terminal voltage of the lithium iron phosphate battery to be sorted after discharge, the terminal voltage of the lithium iron phosphate battery before discharge cut-off and the first current.
4. The method for sorting lithium iron phosphate batteries according to claim 1, wherein the constant-current discharging of the lithium iron phosphate batteries to be sorted is performed by using a second current, and the voltage and the temperature change of the lithium iron phosphate batteries to be sorted in the second discharging process are recorded, and the method comprises the following steps:
recording the voltage and temperature change of a discharge platform of the lithium iron phosphate battery to be sorted in the second discharge process;
and after constant-current discharge is carried out on the lithium iron phosphate batteries to be sorted by adopting the second current, standing for preset time, and recording the terminal voltage of the lithium iron phosphate batteries to be sorted.
5. The method for sorting lithium iron phosphate batteries according to claim 1, wherein the steps of obtaining the same batch of lithium iron phosphate batteries and screening the lithium iron phosphate batteries to be sorted from the same batch of lithium iron phosphate batteries to meet the preset requirement comprise: and screening the appearance of the lithium iron phosphate batteries in the same batch, and eliminating the lithium iron phosphate batteries with the appearance which does not meet the preset requirement to obtain the lithium iron phosphate batteries to be sorted.
6. A lithium iron phosphate battery sorting device, comprising:
the screening module is used for obtaining the lithium iron phosphate batteries in the same batch, and screening out the lithium iron phosphate batteries to be sorted which meet the preset requirement;
the first discharging module is used for carrying out pulse discharging on the lithium iron phosphate batteries to be sorted by adopting a first current, and calculating the internal resistance of the lithium iron phosphate batteries to be sorted according to a first discharging process;
the second discharging module is used for performing constant-current discharging on the lithium iron phosphate batteries to be sorted by adopting a second current and recording the voltage and temperature change of the lithium iron phosphate batteries to be sorted in the second discharging process;
the sorting module is used for sorting the lithium iron phosphate batteries to be sorted according to the internal resistance, the voltage and the temperature change by a preset method;
the method for sorting the lithium iron phosphate batteries to be sorted according to the internal resistance, the voltage and the temperature change by a preset method comprises the following steps: taking the internal resistance, the voltage and the temperature change as input, and obtaining sorting groups of lithium iron phosphate batteries through a preset method;
wherein, according to internal resistance, voltage and temperature variation, sorting lithium iron phosphate batteries to be sorted by a preset method, further comprising:
according to a preset method, carrying out iterative combination on input data meeting preset similarity in input, and obtaining a final sorting result of the lithium iron phosphate battery to be sorted when an iteration termination condition is reached;
the preset method is a hierarchical clustering algorithm, and the lithium iron phosphate battery is sorted according to the hierarchical clustering algorithm, and the specific process is as follows:
s201, taking one battery as one sample, classifying each sample into one group, and calculating the distance between the two groups, namely the similarity between the samples;
s202, classifying high similarity into a group according to characteristic parameters in different samples, and setting a threshold value;
s203, recalculating the distance between the newly generated group and each old group;
s204, repeating the step S202 and the step S203 until the distance divided into the two nearest groups is larger than a set threshold value, and ending the iteration;
the distance between groups is the absolute value difference of the related characteristic parameters of the batteries between the groups, and the related characteristic parameters are internal resistance, voltage and temperature.
7. An electronic device comprising a memory and a processor, wherein,
a memory for storing a program;
a processor coupled to the memory for executing programs stored in the memory to implement the steps in the lithium iron phosphate battery sorting method of any one of the preceding claims 1 to 5.
8. A computer-readable storage medium storing a computer-readable program or instructions that, when executed by a processor, is capable of carrying out the steps of the lithium iron phosphate battery sorting method of any one of the preceding claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111518359.4A CN114200324B (en) | 2021-12-13 | 2021-12-13 | Lithium iron phosphate battery sorting method, device, equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111518359.4A CN114200324B (en) | 2021-12-13 | 2021-12-13 | Lithium iron phosphate battery sorting method, device, equipment and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114200324A CN114200324A (en) | 2022-03-18 |
| CN114200324B true CN114200324B (en) | 2024-02-20 |
Family
ID=80652974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111518359.4A Active CN114200324B (en) | 2021-12-13 | 2021-12-13 | Lithium iron phosphate battery sorting method, device, equipment and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114200324B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093131A (en) * | 2015-09-28 | 2015-11-25 | 哈尔滨工业大学 | Battery health characteristic parameter extracting method for echelon use of lithium iron phosphate battery |
| CN106684475A (en) * | 2017-01-16 | 2017-05-17 | 哈尔滨理工大学 | Method for sorting lithium iron phosphate batteries |
| CN107983667A (en) * | 2017-11-23 | 2018-05-04 | 中国东方电气集团有限公司 | A kind of lithium ion battery grouping method |
| CN110931897A (en) * | 2019-11-29 | 2020-03-27 | 国网江苏电力设计咨询有限公司 | Sorting method for gradient utilization of lithium iron phosphate batteries |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102194844B1 (en) * | 2017-11-02 | 2020-12-23 | 주식회사 엘지화학 | Method, apparatus and recording medium for estimating parameters of battery equivalent circuit model |
-
2021
- 2021-12-13 CN CN202111518359.4A patent/CN114200324B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093131A (en) * | 2015-09-28 | 2015-11-25 | 哈尔滨工业大学 | Battery health characteristic parameter extracting method for echelon use of lithium iron phosphate battery |
| CN106684475A (en) * | 2017-01-16 | 2017-05-17 | 哈尔滨理工大学 | Method for sorting lithium iron phosphate batteries |
| CN107983667A (en) * | 2017-11-23 | 2018-05-04 | 中国东方电气集团有限公司 | A kind of lithium ion battery grouping method |
| CN110931897A (en) * | 2019-11-29 | 2020-03-27 | 国网江苏电力设计咨询有限公司 | Sorting method for gradient utilization of lithium iron phosphate batteries |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114200324A (en) | 2022-03-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111044927B (en) | Power battery service life evaluation method and system | |
| CN113933718B (en) | Retired battery capacity sorting method, retired battery capacity sorting device, retired battery capacity sorting equipment and storage medium | |
| CN111289910B (en) | Grading method and device for echelon batteries, computer equipment and medium | |
| CN107741566A (en) | A kind of battery detection method | |
| CN115995628B (en) | Recovery processing method and device for retired lithium ion battery | |
| CN112946482A (en) | Battery voltage estimation method, device, equipment and storage medium based on model | |
| CN115395613B (en) | Battery charging management method and device, electronic equipment and storage medium | |
| CN116027218B (en) | Battery state evaluation method and electronic equipment | |
| CN114200324B (en) | Lithium iron phosphate battery sorting method, device, equipment and storage medium | |
| CN112748348B (en) | Battery low-temperature performance distribution level detection method and system and storage medium | |
| CN107370859B (en) | Method and device for testing electricity meter of mobile terminal and storage device | |
| CN113447824A (en) | Method and device for estimating maximum charging and discharging current of battery and storage medium | |
| CN115327391B (en) | Detection method and device based on echelon battery utilization | |
| CN117206212A (en) | Battery sorting method, device, equipment and storage medium based on scene | |
| CN115356644B (en) | Battery peak current test method, device, test equipment and storage medium | |
| CN112014748A (en) | Method and system for testing battery cell capacity | |
| CN115236525B (en) | Echelon battery screening method, device and medium | |
| CN117214742A (en) | State analysis method and device for lithium battery and electronic equipment | |
| CN117192251A (en) | Aging performance testing method, device and equipment for super capacitor and storage medium | |
| CN115684967A (en) | Battery connector short circuit detection method and device, electronic equipment and storage medium | |
| CN113125980A (en) | Method and device for detecting direct current internal resistance of battery and terminal equipment | |
| CN119567874A (en) | A method and device for calibrating vehicle battery power | |
| CN116550648A (en) | Sorting method, sorting device, sorting equipment and storage medium for waste batteries | |
| CN115291111B (en) | Training method of battery rest time prediction model and rest time prediction method | |
| CN117087577A (en) | Method, device, equipment and storage medium for determining residual capacity of storage battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |