CN110108239B - Method, system and device for obtaining quality information of pole piece - Google Patents
Method, system and device for obtaining quality information of pole piece Download PDFInfo
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- CN110108239B CN110108239B CN201910428276.2A CN201910428276A CN110108239B CN 110108239 B CN110108239 B CN 110108239B CN 201910428276 A CN201910428276 A CN 201910428276A CN 110108239 B CN110108239 B CN 110108239B
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- 238000000034 method Methods 0.000 title claims abstract description 81
- 238000005192 partition Methods 0.000 claims abstract description 151
- 238000005520 cutting process Methods 0.000 claims abstract description 59
- 238000013441 quality evaluation Methods 0.000 claims abstract description 40
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
- G01B15/02—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G9/00—Methods of, or apparatus for, the determination of weight, not provided for in groups G01G1/00 - G01G7/00
- G01G9/005—Methods of, or apparatus for, the determination of weight, not provided for in groups G01G1/00 - G01G7/00 using radiations, e.g. radioactive
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Abstract
The invention provides a pole piece quality information acquisition method, a pole piece quality information acquisition system and pole piece quality information acquisition equipment, which relate to the technical field of batteries, wherein the method comprises the steps of acquiring a cutting parameter and a scanning parameter of a target pole piece, wherein the cutting parameter comprises an edge material width and a cutting width, and the scanning parameter comprises a scanning width and a scanning speed; dividing the target pole piece according to the slitting parameters to obtain a plurality of pole piece partitions, wherein the width of each pole piece partition is the same as the slitting width; calculating the scanning time period of each pole piece partition according to the cutting parameters and the scanning parameters; when receiving the scanning data of the target pole piece, identifying the scanning data in the scanning time period as the quality data of the corresponding pole piece partition; the scan data includes pole piece thickness data or pole piece weight data. The pole piece quality information acquisition method provided by the embodiment of the invention can acquire the quality information of each small coil after pole pieces are cut, realizes coating quality evaluation of a single small coil and improves the accuracy of product information tracing.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a pole piece quality information acquisition method, system and equipment.
Background
In the production process of the lithium ion battery, the coating surface density of the pole piece is a key ring of process control, and the quality of the consistency of the pole piece surface density greatly influences the quality of the battery performance. The coated pole piece is monitored on line by using an X-ray (X-ray) or beta-ray (beta-ray) on-line weight measuring instrument, and an alarm is given in time when the areal density deviates from the specification.
At present, the existing weighing instrument only performs weighing analysis on a pole piece with the whole width, and cannot correspond to the condition of each small coil after slitting, namely, the coating quality of a single small coil cannot be evaluated. Because the coating weight of the pole piece is positively correlated with the battery cell capacity, and the weight of the small coil is different, the loss of the coating weight data of the small coil causes the corresponding relation between the battery cell capacity and the coating weight to be inaccurate, and the information tracing of the product in the later period is also inaccurate.
Disclosure of Invention
In view of this, the present invention provides a method, a system, and a device for obtaining quality information of a pole piece, which can obtain quality information of each small roll after the pole piece is cut, thereby implementing coating quality evaluation on a single small roll, reducing workload of small roll capacity screening and grouping, and improving accuracy of product information tracing.
In a first aspect, an embodiment of the present invention provides a pole piece quality information obtaining method, including: obtaining cutting parameters and scanning parameters of a target pole piece, wherein the cutting parameters comprise the width of an edge material and the cutting width, and the scanning parameters comprise the scanning width and the scanning speed; dividing the target pole piece according to the slitting parameters to obtain a plurality of pole piece partitions, wherein the width of each pole piece partition is the same as the slitting width; calculating the scanning time period of each pole piece partition according to the cutting parameters and the scanning parameters; when receiving the scanning data of the target pole piece, identifying the scanning data in the scanning time period as the quality data of the corresponding pole piece partition; the scan data includes pole piece thickness data or pole piece weight data.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the step of calculating a scanning time period of each pole piece partition according to the cutting parameter and the scanning parameter includes: calculating the distance between two dividing boundary lines of each pole piece partition and a scanning initial line according to the rim charge width, the slitting width and the scanning width; and calculating the scanning time period of each pole piece partition according to the scanning speed and the distance.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the step of calculating a scanning time period of each pole piece partition according to the cutting parameter and the scanning parameter includes: calculating the scanning time period of any pole piece partition according to the rim charge width, the slitting width and the scanning width; calculating the scanning time of the partition of the single pole piece according to the slitting width and the scanning speed; and calculating the scanning time period of each pole piece partition according to the scanning time period and the scanning time.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where after the step of identifying the scan data in the scan time period as the quality data of the corresponding pole piece partition, the method further includes: and predicting the capacity of the pole piece partition according to the quality data of the pole piece partition.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where after the step of identifying the scan data in the scan time period as the quality data of the corresponding pole piece partition, the method further includes: calculating quality evaluation parameters corresponding to the pole piece partitions according to the quality data of the pole piece partitions, wherein the quality evaluation parameters comprise at least one of a Mean value Mean, a variation coefficient Cov, a process capability index Cp and a process comprehensive capability coefficient Cpk; and performing quality evaluation and classification on each pole piece partition according to the quality evaluation parameters.
With reference to the fourth possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where after the step of dividing the target pole piece according to the slitting parameters to obtain a plurality of pole piece partitions, the method further includes: and generating a code of each pole piece partition, wherein the codes correspond to the pole piece partitions one by one.
With reference to the fifth possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where after the step of calculating the quality assessment parameter of the corresponding pole piece partition according to the quality data of the pole piece partition, the method further includes: and correlating the code with the quality evaluation parameters of the corresponding pole piece partition.
With reference to the fifth or sixth possible implementation manner of the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where the method further includes: when all scanning data of the target pole piece are received, calculating a quality evaluation parameter of the target pole piece according to all the scanning data; and evaluating the target pole piece according to the quality evaluation parameters of the target pole piece, and associating each code with the quality evaluation parameters of the target pole piece.
In a second aspect, an embodiment of the present invention further provides a system for acquiring pole piece quality information, including: the parameter acquisition module is used for acquiring cutting parameters and scanning parameters of the target pole piece, wherein the cutting parameters comprise the width of the rim charge and the cutting width, and the scanning parameters comprise the scanning width and the scanning speed; the pole piece partition dividing module is used for dividing the target pole piece according to the slitting parameters to obtain a plurality of pole piece partitions, and the width of each pole piece partition is the same as the slitting width; the scanning time period calculation module is used for calculating the scanning time period of each pole piece partition according to the cutting parameters and the scanning parameters; the quality data identification module is used for identifying the scanning data in the scanning time period as the quality data of the corresponding pole piece partition when receiving the scanning data of the target pole piece; the scan data includes pole piece thickness data or pole piece weight data.
In a third aspect, an embodiment of the present invention further provides a device for acquiring pole piece quality information, where the device includes: the scanning device and the input device are respectively connected with the processor; the processor is loaded with the pole piece quality information acquisition system provided in the second aspect; the input device is used for inputting the cutting parameters and the scanning parameters of the target pole piece; the cutting parameters comprise the width of the rim charge and the cutting width, and the scanning parameters comprise the scanning width and the scanning speed; the scanning device is used for scanning the target pole piece according to the scanning parameters to obtain scanning data; the scanning data comprises pole piece thickness data or pole piece weight data; the processor is used for acquiring the quality data of each pole piece partition according to the cutting parameters, the scanning parameters and the scanning data.
The embodiment of the invention has the following beneficial effects:
the method comprises the steps of obtaining a cutting parameter and a scanning parameter of a target pole piece, wherein the cutting parameter comprises an edge material width and a cutting width, and the scanning parameter comprises a scanning width and a scanning speed; dividing the target pole piece according to the slitting parameters to obtain a plurality of pole piece partitions, wherein the width of each pole piece partition is the same as the slitting width; calculating the scanning time period of each pole piece partition according to the cutting parameters and the scanning parameters; when receiving the scanning data of the target pole piece, identifying the scanning data in the scanning time period as the quality data of the corresponding pole piece partition; the scan data includes pole piece thickness data or pole piece weight data. The pole piece quality information acquisition method provided by the embodiment of the invention can acquire the quality information of each small coil after the pole piece is cut, thereby realizing the coating quality evaluation of a single small coil, reducing the workload of small coil capacity screening and grouping, and improving the accuracy of product information tracing.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic flow chart of a pole piece quality information obtaining method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a pole piece partition according to an embodiment of the present invention;
fig. 3 is a schematic view of a scanning direction according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of another pole piece quality information obtaining method according to an embodiment of the present invention;
FIG. 5 is a schematic view of another electrode piece partition according to an embodiment of the present invention;
FIG. 6 is a schematic view of a scanning mechanism according to an embodiment of the present invention;
FIG. 7 is a schematic view of a coating weight distribution according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a pole piece quality information acquiring system according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a pole piece quality information acquiring device according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another pole piece quality information acquiring apparatus according to an embodiment of the present invention.
Icon: 10-a target pole piece; 11-a region to be cut; 12-scrap area; 111-pole piece partitioning; 60-a scanning frame; 61-scanning signal transmitting terminal; 62-scanning signal receiving end; 80-a parameter acquisition module; 81-pole piece partition module; 82-a scanning time period calculation module; 83-quality data identification module; 90-a processor; 91-an input device; 92-a scanning device; 800-pole piece quality information acquisition system; 900-pole piece quality information acquisition equipment; 1001-output device; 1002-manufacturing enterprise production process execution system; 1003-label printer.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The production and manufacture of lithium ion batteries are closely connected by individual process steps. In general, the production of lithium batteries includes a pole piece manufacturing process, a battery assembly process, and a final liquid injection, pre-charging, formation, and aging process. In the stage of pole piece manufacturing process, five processes of slurry preparation, slurry coating, pole piece rolling, pole piece slitting and pole piece drying can be subdivided. In the battery assembling process, the processes are roughly classified into winding, casing, welding and the like according to the different specifications and models of the batteries. The final liquid injection stage comprises the processes of liquid injection, air exhaust, sealing, pre-filling, formation, aging and the like.
The slurry coating is the next procedure after the slurry preparation is finished, and the procedure is mainly used for uniformly coating the slurry with good stability, good viscosity and good fluidity on the positive and negative current collectors. The pole piece coating has important significance on the lithium battery, and the quality of the performance of the battery is greatly influenced by the consistency of the density of the pole piece coating surface.
At present, the existing weight measuring instrument only performs weight measurement analysis on a pole piece with the whole width and cannot correspond to the condition of each small coil after cutting, so that the coating quality of a single small coil cannot be evaluated, and a battery cell needs to be charged and discharged at a later stage to screen a capacity group and a matching group. This also makes the corresponding relation of electric core capacity and coating weight inaccurate, leads to the information of later stage product to trace back also inaccurate.
Based on this, the method, the system and the equipment for obtaining the pole piece quality information provided by the embodiment of the invention can obtain the quality information of each small coil after the pole piece is cut, thereby realizing the coating quality evaluation of a single small coil, reducing the workload of small coil capacity screening and grouping, and improving the accuracy of product information tracing.
In order to facilitate understanding of the embodiment, a detailed description is first given to a pole piece quality information acquisition method disclosed in the embodiment of the present invention.
The first embodiment is as follows:
as shown in fig. 1, which is a schematic flow chart of a pole piece quality information obtaining method provided in an embodiment of the present invention, as can be seen from fig. 1, the pole piece quality information obtaining method includes the following steps:
step S102: and obtaining cutting parameters and scanning parameters of the target pole piece, wherein the cutting parameters comprise the width of the rim charge and the cutting width, and the scanning parameters comprise the scanning width and the scanning speed.
Here, the target pole piece can be cut into a plurality of small rolls according to the cutting parameter in the later-stage production process of the winding core, the width of each small roll is the cutting width, the pole piece is the rim charge except the area for producing the small roll, and the rim charge part is cut out of the pole piece according to the rim charge width in the production process of the small roll.
Scanning the target pole piece according to the scanning parameters to obtain scanning data, and scanning and weighing the coated pole piece by using an X-ray or beta-ray online weighing instrument to obtain the scanning data of the pole piece. The scanning speed is the speed of the weight measuring instrument when scanning the pole piece, and the scanning width is the distance between the scanning starting line and the scanning ending line. Here, the scan width may be smaller than the width of the pole piece, which is equivalent to scanning only a specific region of the pole piece, and the scan width may also be larger than the width of the pole piece.
In one embodiment, when the weight measuring instrument is used for scanning the pole piece, the pole piece can be set to perform reciprocating scanning between a scanning starting line and a scanning ending line in a pipeline manner.
Step S104: and dividing the target pole piece according to the slitting parameters to obtain a plurality of pole piece partitions, wherein the width of each pole piece partition is the same as the slitting width.
And (4) performing simulation division on the target pole piece according to the slitting parameters to obtain a plurality of pole piece partitions and rim charge areas. Wherein, for each pole piece subregion, its width equals, all is unanimous with the width of cutting.
As shown in fig. 2, which is a schematic diagram of one of the pole piece partitions, as can be seen from fig. 2, the target pole piece 10, after being partitioned according to the slitting parameters, integrally includes a to-be-slit area 11 and an edge material area 12, where the to-be-slit area refers to an area for making a small roll. The area to be slit 11 is equally divided into a plurality of pole piece partitions 111, and the width of each pole piece partition 111 is M, that is, the slitting width is M.
Step S106: and calculating the scanning time period of each pole piece partition according to the cutting parameters and the scanning parameters.
In at least one possible implementation manner, distances between two dividing boundary lines of each pole piece partition and a scanning start line can be calculated according to the rim charge width, the slitting width and the scanning width; and then, calculating the scanning time period of each pole piece partition according to the scanning speed and the distance.
In one scenario, as shown in fig. 3, a schematic scanning direction diagram for scanning the pole pieces is shown, where each pole piece is scanned in a flowing water manner, the target pole piece 10 moves longitudinally at a specific speed V, and the weight measuring instrument scans the pole pieces reciprocally at a transverse speed Vx. In this embodiment, the weight measuring instrument scans from the side a of the pole piece, and returns to the side B, and so on.
In the embodiment shown in fig. 3, assuming that the time of the scanning start line is t0, first, the distances between the two boundaries of any one pole piece partition and the scanning start line are calculated to be L1 and L2 according to the rim charge width, the slit width and the scanning width, and then the time points of scanning the two boundaries of the pole piece partition are respectively: t0+ L1/Vx, and t0+ L2/Vx, so the scan data in the time period between the two moments are the scan data corresponding to the pole piece partition. By analogy, the scanning time periods corresponding to the pole piece partitions can be obtained.
In another embodiment, the scanning time period of any one pole piece partition can be calculated according to the rim charge width, the slitting width and the scanning width; then, calculating the scanning time of the partition of the single pole piece according to the slitting width and the scanning speed; and then, calculating the scanning time period of each pole piece partition according to the calculated scanning time period of the pole piece partition and the scanning time of a single pole piece partition.
In the embodiment shown in fig. 3, after the scan time period of a certain pole piece partition is calculated to be t0+ L1/Vx to t0+ L2/Vx, according to the scan speed Vx and the pole piece slitting width M, the scan time required by a single pole piece partition can be obtained: M/Vx. Therefore, in combination with the scanning time periods of the pole piece partitions obtained by the calculation, the scanning time periods of the previous pole piece partition and the next pole piece partition are respectively t0+ L1/Vx-M/Vx to t0+ L2/Vx-M/Vx; and t0+ L1/Vx + M/Vx to t0+ L2/Vx + M/Vx. By analogy, the scanning time periods of other pole piece partitions can also be obtained.
Step S108: when receiving the scanning data of the target pole piece, identifying the scanning data in the scanning time period as the quality data of the corresponding pole piece partition; the scan data includes pole piece thickness data or pole piece weight data.
In one embodiment, the scanning data may be acquired while scanning the target pole piece, and the scanning data in the corresponding time period may be identified as the quality data of the corresponding pole piece partition according to the scanning time period of each pole piece partition in real time.
In another embodiment, after the whole scan data is acquired, the whole scan data may be processed, and the scan data of each pole piece partition is respectively extracted from the whole scan data according to time and identified accordingly. Here, the scan data includes pole piece thickness data or pole piece weight data. That is, the scan data may be either or both of the pole piece thickness data and the pole piece weight data.
Thus, the quality data of each pole piece partition on the target pole piece can be obtained. After the target pole piece is cut at the later stage to obtain each small roll, each small roll corresponds to the corresponding pole piece partition, which is equivalent to obtaining the quality data of each small roll.
Under the condition that the gram capacity of the material is exerted to a certain extent, the coating weight is in direct proportion to the capacity of the battery cell, the capacity fluctuation is often caused by the fluctuation of the coating weight, and when the capacity span is large, the capacity sorting work is required to be carried out more. By the pole piece quality information acquisition method provided by the embodiment, after the quality data of each pole piece partition is obtained, the capacity of each pole piece partition can be predicted according to the quality data of the pole piece partition, and capacity matching can be performed quickly; therefore, the capacity of each small roll is not required to be obtained through charging and discharging in the later period, and a large amount of work is saved. Similarly, the internal resistance, multiplying power and other electric performance parameter values can also be obtained according to the quality data of the pole piece partition.
The pole piece quality information acquisition method provided by the embodiment of the invention comprises the steps of acquiring cutting parameters and scanning parameters of a target pole piece, wherein the cutting parameters comprise rim charge width and cutting width, and the scanning parameters comprise scanning width and scanning speed; dividing the target pole piece according to the slitting parameters to obtain a plurality of pole piece partitions, wherein the width of each pole piece partition is the same as the slitting width; calculating the scanning time period of each pole piece partition according to the cutting parameters and the scanning parameters; when receiving the scanning data of the target pole piece, identifying the scanning data in the scanning time period as the quality data of the corresponding pole piece partition; the scan data includes pole piece thickness data or pole piece weight data. The method can obtain the quality information of each small coil after the pole piece is cut, thereby reducing the workload of screening and grouping the capacity of the small coils.
Example two:
on the basis of the pole piece quality information acquisition method shown in fig. 1, the present embodiment provides another pole piece quality information acquisition method, as shown in fig. 4, the method includes the steps of:
step S402: and calculating the quality evaluation parameters of the corresponding pole piece partitions according to the quality data of the pole piece partitions, wherein the quality evaluation parameters comprise at least one of a Mean value Mean, a variation coefficient Cov, a process capability index Cp and a process comprehensive capability coefficient Cpk.
After obtaining the quality data corresponding to each pole piece partition, a quality evaluation parameter of each pole piece partition may be calculated according to the quality data, where the quality evaluation parameter includes at least one of a Mean value (Mean), a coefficient of variation (Cov), a Process Capability index (Cp), and a Process Capability index (Cpk).
Here, the coefficient of variation Cov is the standard deviation divided by the mean value, which represents the dispersion, and the lower the Cov value, the more concentrated the data distribution; the process capability index Cp (upper specification limit-lower specification limit)/(6 × standard deviation) indicates the degree of dispersion of the process characteristics, and a larger value indicates more concentration; the process capability factor Cpk takes into account both the degree of deviation and the degree of dispersion, with larger values indicating better process capability.
Step S404: and performing quality evaluation and classification on each pole piece partition according to the quality evaluation parameters.
After the quality evaluation parameters of the single pole piece subarea on the target pole piece are obtained, the quality evaluation and grading can be carried out on each pole piece subarea according to the quality evaluation parameters obtained by calculation, so that the quality evaluation information and the grading information of the single pole piece subarea are obtained.
In another possible implementation, the quality of the whole pole piece can be evaluated according to the obtained scanning data of the target pole piece. Specifically, firstly, calculating a quality evaluation parameter of a target pole piece according to scanning data; and then, evaluating the whole pole piece according to the quality evaluation parameter of the target pole piece.
The pole piece quality information acquisition method provided by the embodiment of the invention can realize the evaluation of the quality of each pole piece partition on the target pole piece, namely can realize the coating quality evaluation of a single small roll.
Example three:
in order to improve the utilization rate of the coating information of a single pole piece partition and facilitate the tracing of the cell information, on the basis of the pole piece quality information acquisition method shown in fig. 4, the embodiment of the invention also provides another pole piece quality information acquisition method. Wherein, the method comprises the following steps:
and step 30, obtaining cutting parameters and scanning parameters of the target pole piece, wherein the cutting parameters comprise the width of the rim charge and the cutting width, and the scanning parameters comprise the scanning width and the scanning speed.
And step 31, dividing the target pole piece according to the slitting parameters to obtain a plurality of pole piece partitions, wherein the width of each pole piece partition is the same as the slitting width.
And step 32, generating a code of each pole piece partition, wherein the code corresponds to the pole piece partitions one by one. Here, the code may be a letter, a number or a combination thereof, or may be a two-dimensional code, a bar code or the like, and for each pole piece partition, there is a unique code to distinguish the identification. In one embodiment, the code for each pole piece partition may be generated by a Manufacturing Execution System (MES).
And step 33, calculating the scanning time period of each pole piece partition according to the cutting parameters and the scanning parameters.
Step 34, when receiving the scanning data of the target pole piece, identifying the scanning data in the scanning time period as the quality data of the corresponding pole piece partition; the scan data comprises pole piece thickness data or pole piece weight data
And step 35, calculating the quality evaluation parameters of the pole piece partitions according to the quality data corresponding to the pole piece partitions, and associating each code with the quality evaluation parameters of the corresponding pole piece partitions. Wherein the quality assessment parameter comprises at least one of Mean average, Cov coefficient of variation, Cp Process capability index, and Cpk Process comprehensive capability coefficient.
In this way, a unique code is generated for each pole piece partition, the code is associated with the quality evaluation parameter corresponding to the pole piece partition, a corresponding relation between data is established, the code of each small coil is kept unchanged in the subsequent pole piece slitting, winding and other processes, the small coil information can be conveniently traced, the tracing information can be extended to a specific area of the transverse position of the pole piece, and the pole piece quality of the pole piece at the relevant position can be directly associated with electrical core capacity, internal resistance, multiplying power and other performances.
In another embodiment, when all the scanning data of the target pole piece are received, the quality evaluation parameter of the target pole piece can be calculated according to all the scanning data; and then, evaluating the target pole piece according to the quality evaluation parameters of the target pole piece, and associating each code with the quality evaluation parameters of the target pole piece so as to facilitate the subsequent tracing of the evaluation information of the whole pole piece.
Example four:
the embodiment of the invention introduces a quality information acquisition process of a battery pole piece to better understand the pole piece quality information acquisition method provided in the first embodiment, the second embodiment and the third embodiment.
Firstly, a target pole piece is partitioned, and referring to fig. 5, a partitioned schematic diagram of the pole piece is shown, where M is the width of a small rolled pole piece after slitting, a1 and a2 are the widths of edge trims, and B1 and B2 are the peripheral widths, in this embodiment, a region to be slit of the target pole piece 10 is totally partitioned into 6 pole piece partitions, and the pole piece partitions are numbered first, second, and sixth in sequence from the side a to the side B.
Referring to fig. 6, the scanning mechanism includes a scanning frame 60, and a scanning signal transmitting terminal 61 and a scanning signal receiving terminal 62 which are arranged on the scanning frame 60, where a target pole piece 10 is arranged between the scanning signal transmitting terminal 61 and the scanning signal receiving terminal 62, and the scanning signal transmitting terminal 61 and the scanning signal receiving terminal 62 move at the transverse speed Vx simultaneously to scan the pole piece.
In the normal coating area, the sampling time t is defined by the width of the cutm。tmAs defined below:
t0＝M/Vx (1)
tmt0/n (2) (n is an integer)
Wherein, t0Representing the scanning time of a single pole piece partition, n is the number of scanning sampling points in the single pole piece partition, tmThe sampling point time of a single scanning sampling point.
In this embodiment, the target pole piece 10 is a positive pole of a certain type, and the slitting width is 92 mm. And (3) measuring weight by using an X-ray, wherein the scanning speed is 0.1m/min, the upper limit of the sampling point frequency of the equipment is 10 ms/block, and 5 points are sampled in each partition, namely one point is sampled in 11.04 ms.
With side a as the scanning start point, the scanning speed Vx of the apparatus is fixed. According to the scanning speed, it can be set that no data is recorded in the b1 and b2 areas, and data recording is started after the data passes through the a1 boundary to the right and the a2 boundary to the left during scanning. At this time, the scan width is the distance from side a to side B.
In this embodiment, the scanning time period of each pole piece partition is calculated according to the peripheral width, the scrap width and the small roll width and the scanning speed, and taking section # i as an example, if the distances from two boundary lines to the scanning start line (a side) are set as L1 and L2, then: l1 ═ a1+ b1, L2 ═ a1+ b1+ M. Thus, the corresponding scanning time period of the pole piece is as follows: L1/Vx to L2/Vx. By analogy, the scanning time periods of other pole piece partitions can be obtained. Therefore, after the scanning data of the pole pieces are obtained, the scanning data corresponding to each pole piece partition can be obtained according to the time scale.
The weight partition data obtained by scanning is shown in fig. 7, two thick straight lines are upper and lower limits of the coating weight, 1, 2, 3, 4, 5, and 6 are scanning partitions divided according to the slitting width, the partition No. 1 corresponds to the side a, and the partition No. 2 corresponds to the side B. The weight measuring instrument scans once horizontally to leave a row of points with the same gray scale, each subarea is scanned once to obtain data of 5 points, and a column of points with different gray scales in the longitudinal direction represents different scanning times.
As can be seen from fig. 7, the weight fluctuation of the individual divisions is smaller than the weight fluctuation of the entire width from the a side to the B side, wherein the weight fluctuation of division No. 1 near the a side and division No. 6 near the B side is larger than that of the middle division.
Statistical analysis of the above partition data resulted in the following evaluation table 1:
TABLE 1
| Zone numbering | 1 | 2 | 3 | 4 | 5 | 6 |
| mean | 664.5 | 668.5 | 669.3 | 668.4 | 667.0 | 664.0 |
| cov | 0.616％ | 0.176％ | 0.195％ | 0.206％ | 0.187％ | 0.268％ |
| CP | 1.059 | 3.692 | 3.313 | 3.153 | 3.483 | 2.434 |
| CPK | 0.636 | 3.362 | 3.203 | 2.834 | 2.759 | 1.365 |
Meanwhile, the whole width is evaluated as the following table 2:
TABLE 2
| mean | 667.0 |
| cov | 0.434％ |
| CP | 1.645 |
| CPK | 1.301 |
As can be seen from the two tables, the average values of the small rolls are greatly different, and the CPK and the COV in a single roll are better; the CPK and COV of the edge roll are obviously inferior to those of the middle roll due to the edge thinning; the CPK of the middle 2 and 3 coils is higher than 3.0, the data distribution is quite centralized, the capacities of the battery cells made by the coils are correspondingly distributed and centralized, the capacities of the battery cells made by the polar coils with the same coating weight rating are distributed less, and the capacity grouping screening work can be reduced.
Here, since each pole piece section of the pole piece is numbered, the weight evaluation information and the entire width whole weight evaluation information of each pole piece section may be attached to each number. And in the processes after coating and until slitting, the definitions of the two sides of A, B are kept fixed, and the positions corresponding to the (i) and (ii) are fixed. After cutting, the information of each area corresponding to the first region, the second region, the third region and the fourth region corresponds to the corresponding small coil through code scanning, and the information of the small coil corresponds to each battery cell. Therefore, a complete tracing chain from the battery cell to the pole piece coating fixed area is completed, tracing information can be extended to a specific area at the transverse coating position, and the coating quality of the pole piece at the relevant position is directly related to the electric properties such as the capacity, the internal resistance, the multiplying power and the like of the battery cell. In addition, since the relative change in weight of the lateral securing region is small when coating, the weight CPK within a single small roll tends to be high, and the capacity uniformity will be higher for a single small roll or a small roll with similar weight assessment. According to the characteristic, the grouping work is carried out in advance, so that the capacity screening and grouping work can be reduced.
Example five:
the embodiment of the present invention further provides a pole piece quality information obtaining system, referring to fig. 8, which is a schematic structural diagram of the system, and as can be seen from fig. 8, the pole piece quality information obtaining system includes a parameter obtaining module 80, a pole piece partition dividing module 81, a scanning time period calculating module 82, and a quality data identification module 83, which are connected in sequence. The functions of each module are as follows:
a parameter obtaining module 80, configured to obtain a cutting parameter and a scanning parameter of the target pole piece, where the cutting parameter includes a rim charge width and a cutting width, and the scanning parameter includes a scanning width and a scanning speed;
the pole piece partition module 81 is used for dividing the target pole piece according to the slitting parameters to obtain a plurality of pole piece partitions, and the width of each pole piece partition is the same as the slitting width;
a scanning time period calculation module 82, configured to calculate a scanning time period of each pole piece partition according to the cutting parameter and the scanning parameter;
the quality data identification module 83 is configured to identify, when receiving the scan data of the target pole piece, the scan data in the scan time period as the quality data of the corresponding pole piece partition; the scan data includes pole piece thickness data or pole piece weight data.
The pole piece quality information acquisition system provided by the embodiment of the invention has the same implementation principle and technical effect as the pole piece quality information acquisition method embodiment, and for brief description, the corresponding content in the method embodiment can be referred to where the system embodiment is not mentioned.
Example six:
an embodiment of the present invention further provides a pole piece quality information acquiring apparatus, which is a schematic structural diagram of the pole piece quality information acquiring apparatus 900, referring to fig. 9, where the pole piece quality information acquiring apparatus 900 includes an input device 91, a processor 90, and a scanning device 92, which are connected in sequence. The processor 90 is loaded with the pole piece quality information acquiring system provided in the fifth embodiment and one of the possible implementations thereof.
In the pole piece quality information acquiring apparatus 900, the input device is configured to input a cutting parameter and a scanning parameter of a target pole piece; the cutting parameters comprise the width of the rim charge and the cutting width, and the scanning parameters comprise the scanning width and the scanning speed; the scanning device is used for scanning the target pole piece according to the scanning parameters to obtain scanning data; the scanning data comprises pole piece thickness data or pole piece weight data; and the processor is used for acquiring the quality data of each pole piece partition according to the cutting parameters, the scanning parameters and the scanning data.
Referring to fig. 10, a schematic diagram of an application scenario of the pole piece quality information acquiring apparatus is shown, wherein the processor 90 of the pole piece quality information acquiring apparatus 900 is respectively connected to the output device 1001 and the manufacturing enterprise production process execution system 1002, and the label printer 1003 is connected to the manufacturing enterprise production process execution system 1002. In actual operation, information such as pole piece slitting width, rim charge width, scanning speed and the like can be input through the input device 91, the system calculates the time from a scanning starting point to a rim charge boundary according to the scanning width and the rim charge width, and data can not be acquired or displayed in the time; and calculating the sampling time and the number of sampling points of each subarea according to the slitting width, wherein the number of the sampling points of each subarea is an integer within the corresponding time limit range. The processor 90 sends the above instructions to the pole piece scanning device 92, and the scanning device 92 obtains the scanning signals and then transmits the scanning signals back to the processor 90. The processor 90 evaluates the scan signals by partition and full width and may output the results on a display device to facilitate staff on-line adjustments. After the whole roll coating is finished, the manufacturing enterprise production process execution system 1002 acquires evaluation information of the pole pieces, generates whole roll codes and partition codes, binds corresponding process information, and finally combines the information to the battery cell bar codes produced by the corresponding pole pieces to complete a complete tracing process from coating to battery cells. The label printer 1003 prints out an evaluation grading result and a bar code label, so that code scanning and binding in the next process are facilitated.
The pole piece quality information acquisition device provided by the embodiment of the invention has the same technical characteristics as the pole piece quality information acquisition system provided by the fifth embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention.
In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The computer program product for performing the pole piece quality information obtaining method provided by the embodiment of the present invention includes a computer readable storage medium storing a nonvolatile program code executable by a processor, where instructions included in the program code may be used to execute the method described in the foregoing method embodiment, and specific implementation may refer to the method embodiment, and is not described herein again.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A pole piece quality information acquisition method is characterized by comprising the following steps:
obtaining cutting parameters and scanning parameters of a target pole piece, wherein the cutting parameters comprise the width of an edge material and the cutting width, and the scanning parameters comprise the scanning width and the scanning speed;
dividing the target pole piece according to the slitting parameters to obtain a plurality of pole piece partitions, wherein the width of each pole piece partition is the same as the slitting width;
calculating the scanning time period of each pole piece partition according to the cutting parameters and the scanning parameters;
when receiving the scanning data of the target pole piece, identifying the scanning data in the scanning time period as the quality data corresponding to the pole piece partition; the scan data includes pole piece thickness data or pole piece weight data.
2. The pole piece quality information acquisition method according to claim 1, wherein the step of calculating the scanning time period of each pole piece partition according to the slitting parameter and the scanning parameter comprises:
calculating the distance between two dividing boundary lines of each pole piece partition and a scanning starting line according to the rim charge width, the slitting width and the scanning width;
and calculating the scanning time period of each pole piece partition according to the scanning speed and the distance.
3. The pole piece quality information acquisition method according to claim 1, wherein the step of calculating the scanning time period of each pole piece partition according to the slitting parameter and the scanning parameter comprises:
calculating the scanning time period of any one pole piece partition according to the rim charge width, the slitting width and the scanning width;
calculating the scanning time of each pole piece partition according to the slitting width and the scanning speed;
and calculating the scanning time period of each pole piece partition according to the scanning time period and the scanning time.
4. The pole piece quality information acquisition method of claim 1, wherein after the step of identifying the scan data within the scan time period as quality data corresponding to the pole piece partition, the method further comprises:
and predicting the capacity of the pole piece partition according to the quality data of the pole piece partition.
5. The pole piece quality information acquisition method of claim 1, wherein after the step of identifying the scan data within the scan time period as quality data corresponding to the pole piece partition, the method further comprises:
calculating quality evaluation parameters corresponding to the pole piece partitions according to the quality data of the pole piece partitions, wherein the quality evaluation parameters comprise at least one of a Mean value Mean, a variation coefficient Cov, a process capability index Cp and a process comprehensive capability coefficient Cpk;
and performing quality evaluation and grading on each pole piece partition according to the quality evaluation parameters.
6. The pole piece quality information acquisition method according to claim 5, wherein after the step of dividing the target pole piece according to the slitting parameters to obtain a plurality of pole piece partitions, the method further comprises:
and generating a code of each pole piece partition, wherein the codes correspond to the pole piece partitions one by one.
7. The pole piece quality information acquisition method according to claim 6, wherein after the step of calculating the quality evaluation parameter corresponding to the pole piece partition according to the quality data of the pole piece partition, the method further comprises:
and associating the codes with the quality evaluation parameters of the corresponding pole piece partitions.
8. The pole piece quality information acquisition method according to claim 6 or 7, further comprising:
when all scanning data of the target pole piece are received, calculating a quality evaluation parameter of the target pole piece according to all the scanning data;
and evaluating the target pole piece according to the quality evaluation parameters of the target pole piece, and associating each code with the quality evaluation parameters of the target pole piece.
9. A pole piece quality information acquisition system, comprising:
the parameter acquisition module is used for acquiring cutting parameters and scanning parameters of the target pole piece, wherein the cutting parameters comprise the width of the rim charge and the cutting width, and the scanning parameters comprise the scanning width and the scanning speed;
the pole piece partition dividing module is used for dividing the target pole piece according to the slitting parameters to obtain a plurality of pole piece partitions, and the width of each pole piece partition is the same as the slitting width;
the scanning time period calculation module is used for calculating the scanning time period of each pole piece partition according to the cutting parameters and the scanning parameters;
the quality data identification module is used for identifying the scanning data in the scanning time period as the quality data corresponding to the pole piece partition when receiving the scanning data of the target pole piece; the scan data includes pole piece thickness data or pole piece weight data.
10. A pole piece quality information acquisition apparatus, comprising: the scanning device and the input device are respectively connected with the processor; the processor is loaded with the pole piece quality information acquisition system of claim 9;
the input device is used for inputting the cutting parameters and the scanning parameters of the target pole piece; the cutting parameters comprise the width of the rim charge and the cutting width, and the scanning parameters comprise the scanning width and the scanning speed;
the scanning device is used for scanning the target pole piece according to the scanning parameters to obtain scanning data; the scanning data comprises pole piece thickness data or pole piece weight data;
and the processor is used for acquiring the quality data of each pole piece partition according to the cutting parameters, the scanning parameters and the scanning data.
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| CN115839902A (en) * | 2022-09-02 | 2023-03-24 | 宁德时代新能源科技股份有限公司 | Surface density measurement method, surface density measurement system and computer equipment |
| CN116936747A (en) * | 2023-06-30 | 2023-10-24 | 深圳市曼恩斯特科技股份有限公司 | Lithium electrode plate quality tracing system and method |
| CN118446590B (en) * | 2024-05-20 | 2025-02-11 | 惠州市信宇人科技有限公司 | Intelligent machine adjustment method and related equipment for double-sided coating of lithium-ion battery electrodes |
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