CN115728180A - Method for detecting production of lithium battery electrode - Google Patents
Method for detecting production of lithium battery electrode Download PDFInfo
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- CN115728180A CN115728180A CN202211459434.9A CN202211459434A CN115728180A CN 115728180 A CN115728180 A CN 115728180A CN 202211459434 A CN202211459434 A CN 202211459434A CN 115728180 A CN115728180 A CN 115728180A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a method for producing and detecting a lithium battery electrode, which comprises the following steps: unreeling the substrate; laser coding; coating a substrate; performing first surface density detection, performing surface density detection on the wet film coating through a surface density measuring group, and recording data; drying; reading the code, namely reading the two-dimensional code mark on the substrate through a code reading assembly; performing second surface density detection, and drawing a first surface density linear curve after coating processing on one side of the substrate; rolling the base material; repeating the steps, coating and detecting the other side of the base material, and drawing a second linear curve of the surface density after coating processing; comparing the first surface density linear curve with the second surface density linear curve, and if the first surface density linear curve and the second surface density linear curve can be completely overlapped or the error is within a normal range, determining that the electrode slice is qualified; otherwise, marking the electrode slice as a defective product. The invention can accurately track the coating positions on the two sides of the electrode plate, and simultaneously detect and compare the densities of the two side surfaces of the electrode plate after coating is finished in time.
Description
Technical Field
The invention relates to the technical field of electrode plate processing, in particular to a method for producing and detecting a lithium battery electrode.
Background
With the advent of the mobile internet and the 5G era, lithium batteries have also become popular. The lithium battery is used as the heart of the mobile equipment, and is widely applied to a plurality of technical fields such as smart phones, electric automobiles, electric bicycles, military equipment, aerospace and the like due to the characteristics of high energy density, long service life and the like. Lithium batteries, which are most commonly used in mobile devices and portable computers, are generally manufactured by using a plurality of electrode sheets coated with active materials, a separator, an electrolyte, and an external case according to design requirements. In the lithium battery production process, pole piece coating is a crucial process, and the pole piece coating has important significance to the capacity, consistency, safety and the like of the lithium battery, and the pole piece coating effect has important influence on the capacity, internal resistance, cycle life and safety of the battery according to incomplete statistics: the proportion of battery failure caused by the pole piece coating process to the total failure of the lithium battery is more than 10%, so that the coating quality of the pole piece is guaranteed to be crucial.
Pole piece coating generally refers to a process of uniformly coating a uniformly stirred slurry on a current collector and drying a solvent in the slurry. The selection and control parameters of the coating mode have important influence on the performance and quality of the lithium ion battery, which is mainly shown in the following steps: coating and drying temperature control, coating surface density, coating size and coating thickness. When the densities of the two side surfaces of the double-surface coated electrode plate are not consistent, the phenomenon of too low or too high battery capacity can occur, and the cycle performance and the safety of the lithium ion battery can be directly influenced.
At present, the method for detecting the density of two side surfaces of an electrode plate is to randomly select a plurality of test point positions on two sides of the coated electrode plate to detect the density of the two side surfaces, and compare whether the density values of the two side surfaces of the selected point positions are consistent or not. When the method is adopted for surface density detection, the coating positions on two sides of the detection point cannot be accurately positioned, and the detection result of the surface density may deviate, so that the final detection result is inconsistent with the real condition.
Therefore, it is necessary to design a method for detecting the production of lithium battery electrodes to solve the above problems.
Disclosure of Invention
In order to overcome the above disadvantages, the present invention provides a method for detecting a lithium battery electrode, which can accurately track the coating positions on two sides of an electrode plate, and detect and compare the densities of two sides of the electrode plate in time after the coating is completed.
In order to achieve the above purposes, the invention adopts the technical scheme that: a method for detecting the production of an electrode of a lithium battery comprises the following steps:
the method comprises the following steps: unreeling the base material, and moving and feeding the base material to be coated under the matching action of the unreeling machine and the driving roller to realize automatic feeding of the base material;
step two: laser coding is carried out, and two-dimensional code marks are marked on the edge of the base material, so that the position of the base material needing coating can be accurately tracked;
step three: coating the substrate, namely uniformly coating the slurry prepared into the liquid film on a substrate surface coating area transferred to the lower part by a coating head so as to form a wet film coating on the surface of the substrate;
step four: performing first surface density detection, performing surface density detection on the wet film coating through a surface density measuring group, and recording data;
and comparing the surface density data of the wet film coating on the two sides of the base material to judge whether the surface of the base material is uniformly coated. The first surface density measurement group is electrically connected with the coating head and the external controller, when the density detection results of two side surfaces of the substrate are inconsistent or the error exceeds a normal range, the coating amount of the coating head has an error, the substrate is not uniformly coated, the external controller can timely regulate and control the coating amount of the coating head, and the production yield of the electrode plate is ensured. Meanwhile, when the coating of different materials is replaced, the difference of the surface density can be generated during coating due to the uneven thickness of the base material, and the surface density data can be fed back in time to adjust the coating amount of the coating head in real time through the closed loop feedback of the coating head, the surface density measurement group I and the external controller.
When the density results of the two sides of the coated base material are consistent or the error is in a normal range, the coating is uniform, and the base material can enter the next drying procedure.
Step five: drying, namely drying the wet film coating coated on the base material through a drying box;
step six: reading a code, namely reading the two-dimensional code mark on the base material through a code reading assembly to obtain the accurate coating position of the base material, so that the specific coating point position on the base material and the coating time form an incidence relation;
step seven: performing surface density detection for the second time, performing surface density detection on the surface coating of the substrate after two pairs of drying by the surface density measuring group, recording data, and drawing a surface density linear curve I after coating processing on one side of the substrate;
step eight: winding the substrate, and winding the prepared electrode plate through a winding machine;
step nine: repeating the steps, coating and detecting the other side of the base material, and drawing a second linear curve of the surface density after coating processing;
step ten: comparing the data, namely comparing the first surface density linear curve with the second surface density linear curve, and if the first surface density linear curve and the second surface density linear curve can be completely superposed or the error is within a normal range, determining that the electrode slice is qualified; otherwise, marking the electrode slice as a defective product.
Furthermore, in the second step, the two-dimensional code mark is marked on the base material through the laser coding machine, so that the code reading assembly can scan and read the position information of the coating point, and the coating position accuracy of the subsequent coating head is ensured.
Furthermore, the laser coding machine, the coating head, the code reading assembly, the first surface density measurement set and the second surface density measurement set are electrically connected with an external controller, whether the surface of the base material is uniformly coated or not is judged according to the detection data, if the surface of the base material is not uniformly coated, the external controller can timely regulate and control the coating amount of the coating head, closed-loop regulation and control are achieved, and the production yield of the electrode plate is guaranteed.
Further, the first surface density measuring group is specifically a first surface density measuring instrument, and the second surface density measuring group is specifically a second surface density measuring instrument.
Furthermore, the first surface density measuring instrument and the second surface density measuring instrument are microspots X-ray or beta-ray sensors, and the spot area of the ray emitted by the microspots X-ray or beta-ray sensors is not more than 40mm 2 The code reading assembly is specifically a code reading sensor, the coating position of the sizing agent on the base material is accurately tracked through the code reading sensor, the subsequent comparison and detection of the coating amount of the same position on the two sides of the base material are facilitated, and whether the manufactured electrode plate meets the requirement or not is automatically judged.
The electrode sheet after processing needs to be welded subsequently to realize current conduction, so when the base material is coated, a small gap (generally between 3 and 50 mm) for welding the empty foil is left at the edge of the coating point. When the coating head is coated at a coating point, due to the fluidity and the surface tension of the slurry, the phenomenon of uneven coating thickness exists in a transition area between the slurry and the gap, the surface density of the edge of the smaller gap can be accurately detected while the surface density of the coating area is detected by using a microspur X-ray or beta-ray sensor, and according to the detected surface density data, the gap pieces with different inclination angles are replaced for the coating head, so that the production requirement of consistent density of two side surfaces of an electrode plate is met, and the coating efficiency of the coating head is ensured.
Furthermore, the coating head is an extrusion coating head or a transfer coating head, and the coating precision of the base material is ensured.
Further, the specific two-dimensional code marking area on the substrate is two sides or the peripheral edge of the area needing coating.
Furthermore, a plurality of drying fans are symmetrically arranged in the drying box along the length direction of the drying box, and the drying speed of the coating on the base material is improved by arranging the plurality of drying fans.
The invention has the beneficial effects that:
1. according to the invention, through the mutual cooperation of the laser coding machine, the coating head and the surface density measurement group, a two-dimensional code mark is marked on a position to be coated on the substrate, the surface density detection is carried out on the surface of the substrate in a wet film state, whether the surface of the substrate is uniformly coated is judged according to detection data, if the surface of the substrate is not uniformly coated, the coating amount of the coating head can be timely regulated and controlled by an external controller, closed-loop regulation and control are realized, the production yield of the electrode plate is ensured, and the coating positions on two sides of the electrode plate can be accurately tracked through coding of the laser coding machine, so that each point position on the coated substrate can detect the corresponding surface density data.
2. According to the invention, the surface density detection is realized on both sides of the substrate after two pairs of coating and drying of the surface density measurement group, and the surface density detection data on both sides are drawn into a surface density linear curve I and a surface density linear curve II, if the surface density detection data can be completely overlapped or the error is within a normal range, the electrode slice is qualified; otherwise, the electrode plate is marked as a defective product, so that the density of the two side surfaces of the electrode plate can be detected and compared in time, and the defective product can be detected in time.
Drawings
FIG. 1 is a front view of the overall structure of an embodiment of the present invention;
FIG. 2 is a schematic diagram of two scanning paths of an areal density gauge according to an embodiment of the invention;
FIG. 3 is a linear plot of areal density according to one embodiment of the invention;
in the figure: 1. an unreeling machine; 2. a driving roller; 3. a laser coding machine; 4. coating heads; 5. a substrate; 6. a first surface density measurement group; 7. a second group of surface density measurements; 8. a drying box; 9. a code reading component; 10. and (7) a winding machine.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to fig. 1 to 3, the method for detecting the production of the lithium battery electrode in the embodiment includes the following steps:
the method comprises the following steps: the base material 5 is unreeled, and the base material 5 to be coated moves and is fed under the cooperation of the unreeling machine 1 and the driving roller 2, so that the base material 5 is automatically fed;
step two: laser coding is carried out, and two-dimensional code marks are marked on the edge of the base material 5, so that the position of the base material 5 needing coating can be accurately tracked;
step three: coating the substrate 5, namely uniformly coating the slurry prepared into a liquid film on the surface coating area of the substrate 5 transferred below by the coating head 4 to form a wet film coating on the surface of the substrate 5;
step four: performing first surface density detection, namely performing surface density detection on the wet film coating through a first surface density measurement group 6, and recording data;
and comparing the surface density data of the substrate 5 in the wet film coating state at two sides to judge whether the surface of the substrate 5 is uniformly coated. The first surface density measurement group 6 is electrically connected with the coating head 4 and the external controller, the first surface density measurement group 6 and the second surface density measurement group 7 are arranged above the substrate 5, when the density detection results of two side surfaces of the substrate 5 are inconsistent or the error exceeds a normal range, the coating amount of the coating head 4 is indicated to have an error, the substrate 5 is not uniformly coated, and the external controller can timely regulate and control the coating amount of the coating head 4, so that the production yield of the electrode plate is ensured. Meanwhile, when the base material 5 made of different materials is replaced for coating, because the thickness of the base material 5 is uneven, the difference of the surface density can be generated during coating, and the surface density data can be fed back in time through the closed loop feedback of the coating head 4, the surface density measuring group I6 and an external controller, so that the coating amount of the coating head 4 can be adjusted in real time, and the error of the base material 5 can be eliminated.
When the density results of the two side surfaces of the coated substrate 5 are consistent or the error is within the normal range, the coating is uniform, and the substrate 5 can enter the next drying procedure.
Step five: drying, namely drying the wet film coating coated on the substrate 5 through a drying box 8;
step six: reading the code, namely reading the two-dimensional code mark on the substrate 5 through the code reading assembly 9, so that the specific coating point position on the substrate 5 and the coating time form an association relationship shown in the following table 1, wherein the surface density value in the table 1 is the surface density value of the second surface density detection;
table 1:
| relative time/s | Two-dimensional code position number | Areal density mg/cm2 |
| 1 | 22K00070001 | 24.93 |
| 3 | 22K00070003 | 25.34 |
| 6 | 22K00070006 | 25.38 |
| 9 | 22K00070009 | 24.83 |
| 11 | 22K00070011 | 24.97 |
| 13 | 22K00070013 | 25.35 |
| 15 | 22K00070015 | 24.59 |
| 17 | 22K00070017 | 24.61 |
| 19 | 22K00070019 | 24.78 |
| 21 | 22K00070021 | 24.90 |
| 23 | 22K00070023 | 24.64 |
| 25 | 22K00070025 | 25.09 |
| 27 | 22K00070027 | 25.00 |
| 29 | 22K00070029 | 25.31 |
Step seven: performing surface density detection on the dried surface coating of the substrate 5 through a second surface density measurement group 7, recording data, drawing a first surface density linear curve of the coated and processed substrate 5 on one side, wherein the second surface density measurement group 7 performs uniform reciprocating scanning along the width direction of the substrate 5 during detection, the moving scanning path refers to the attached drawing 2, wherein a vertical arrow indicates the moving direction of the substrate 5, a horizontal bidirectional arrow indicates the reciprocating moving direction of the second surface density measurement group 7, and a worker can adjust the scanning range of the second surface density measurement group 7 in advance;
the second surface density measuring group 7 is a second surface density measuring instrument, and the second surface density measuring instrument can directly scan and measure the surface density value of the corresponding position. And the precise position number of the coating point is taken as an X axis, the surface density numerical value of the corresponding coating point measured by the surface density measuring instrument II is taken as a Y axis, and the surface density numerical values corresponding to each point position are sequentially connected to form a unique surface density linear curve I, which is shown in the attached figure 3.
Step eight: winding the substrate 5, and winding the prepared electrode plate through a winding machine 10;
step nine: repeating the first to eighth steps, coating and detecting the other side of the substrate 5, and drawing a second surface density linear curve after coating processing, wherein the drawing process of the second surface density linear curve is consistent with that of the first surface density linear curve;
the linear curve of the surface density can accurately represent whether the densities of two side surfaces of the whole machined electrode plate are consistent or not.
Step ten: data comparison, namely comparing the first surface density linear curve with the second surface density linear curve, and if the two curves can be completely superposed or the error is within a normal range, determining that the electrode slice is qualified; otherwise, the electrode plate is marked as a defective product.
In the second step, the two-dimensional code mark is marked on the substrate 5 through the laser coding machine 3, so that the code reading component 9 can scan and read the position information of the coating point, and the coating position accuracy of the subsequent coating head 4 is ensured.
The laser coding machine 3, the coating head 4, the code reading assembly 9, the first surface density measurement set 6 and the second surface density measurement set 7 are electrically connected with an external controller, whether the surface of the substrate 5 is uniformly coated or not is judged according to detection data, if the surface of the substrate is not uniformly coated, the external controller can timely regulate and control the coating amount of the coating head 4, closed-loop regulation and control are achieved, and the production yield of electrode plates is guaranteed.
The first surface density measuring group 6 is specifically a first surface density measuring instrument, the second surface density measuring group 7 is specifically a second surface density measuring instrument, and the specific number of the first surface density measuring instrument and the second surface density measuring instrument is not limited as long as the surface density detection of the coated substrate 5 can be realized.
The first surface density measuring instrument and the second surface density measuring instrument are microspots X-ray or beta-ray sensors, and the spot area of each microspot X-ray or beta-ray sensor is not more than 40mm 2 The code reading assembly 9 is specifically a code reading sensor, and the coating position of the sizing agent on the base material 5 is accurately tracked through the code reading sensor, so that the subsequent comparison and detection of the coating amount on the same position on the two sides of the base material 5 are facilitated, and whether the manufactured electrode plate meets the requirements or not is automatically judged.
The electrode sheet after processing needs to be welded subsequently to realize current conduction, so that a small gap (generally between 3 and 50 mm) for welding a hollow foil is reserved at the edge of a coating point when a base material is coated. When the coating head is coated at a coating point, due to the fluidity and the surface tension of the slurry, the phenomenon of uneven coating thickness exists in a transition area between the slurry and the gap, the surface density of the edge of the smaller gap can be accurately detected while the surface density of the coating area is detected by utilizing micro-spot X rays or beta rays, and according to the detected surface density data, gap pieces with different inclination angles are replaced for the coating head, so that the production requirement that the densities of two side surfaces of an electrode plate are consistent is met, and the coating efficiency of the coating head on a base material is ensured.
The coating head 4 is an extrusion coating head 4 or a transfer coating head 4, and the coating precision of the base material 5 is ensured.
The specific two-dimensional code marking area on the substrate 5 is two sides or the peripheral edge of the area needing coating.
A plurality of drying fans are symmetrically arranged in the drying box 8 along the length direction of the drying box, and the drying speed of the coating on the base material 5 is improved by arranging the plurality of drying fans.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method for producing and detecting lithium battery electrodes is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: the base material (5) is unreeled, and the base material (5) to be coated moves and is fed under the matching action of the unreeling machine (1) and the driving roller (2);
step two: laser coding is carried out, and two-dimensional code marks are marked on the edge of the base material (5);
step three: coating the base material (5), wherein the coating head (4) uniformly coats the slurry prepared into a liquid film in a surface coating area of the base material (5) transferred below the coating head to form a wet film coating on the surface of the base material (5);
step four: performing first surface density detection, namely performing surface density detection on the wet film coating through a first surface density measurement group (6), and recording data;
step five: drying, namely drying the wet film coating coated on the base material (5) through a drying box (8);
step six: reading a code, namely reading a two-dimensional code mark on the base material (5) through a code reading assembly (9) to obtain the accurate coating position of the base material (5), so that a correlation relation is formed between a specific coating point position on the base material (5) and coating time;
step seven: performing second surface density detection, namely performing surface density detection on the dried surface coating of the base material (5) through a second surface density measurement group (7), recording data, and drawing a first surface density linear curve after coating processing on one side of the base material (5);
step eight: winding the substrate (5), and winding the prepared electrode plate through a winding machine (10);
step nine: repeating the steps, coating and detecting the other side of the base material (5), and drawing a second linear curve of the surface density after coating processing;
step ten: data comparison, namely comparing the first surface density linear curve with the second surface density linear curve, and if the first surface density linear curve and the second surface density linear curve can be completely overlapped or the error is within a normal range, determining that the electrode slice is qualified; otherwise, the electrode plate is marked as a defective product.
2. The method for detecting the production of the lithium battery electrode as claimed in claim 1, wherein: and in the second step, marking the two-dimensional code on the base material (5) by the laser coding machine (3).
3. The method for detecting the production of the lithium battery electrode as claimed in claim 2, wherein: the laser coding machine (3), the coating head (4), the code reading assembly (9), the first surface density measuring set (6) and the second surface density measuring set (7) are electrically connected with an external controller.
4. The method for detecting the production of the lithium battery electrode as claimed in claim 1, wherein: the first surface density measurement group (6) is specifically a first surface density measurement instrument, and the second surface density measurement group (7) is specifically a second surface density measurement instrument.
5. The method for detecting the production of the lithium battery electrode as claimed in claim 4, wherein: the first surface density measuring instrument and the second surface density measuring instrument are microspot X-ray or beta-ray sensors, and the spot area of the ray emitted by the microspot X-ray or beta-ray sensors is not more than 40mm 2 The code reading component (9) is specifically a code reading sensor.
6. The method for detecting the production of the lithium battery electrode as claimed in claim 1, wherein: the coating head (4) is an extrusion coating head (4) or a transfer coating head (4).
7. The method for detecting the production of the lithium battery electrode as claimed in claim 1, wherein: the specific coding mark area on the base material (5) is two sides or the peripheral edge of the area needing coating.
8. The method for detecting the production of the lithium battery electrode as claimed in claim 1, wherein: a plurality of drying fans are symmetrically arranged in the drying box (8) along the length direction of the drying box.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211459434.9A CN115728180A (en) | 2022-11-16 | 2022-11-16 | Method for detecting production of lithium battery electrode |
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| CN202211459434.9A CN115728180A (en) | 2022-11-16 | 2022-11-16 | Method for detecting production of lithium battery electrode |
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| CN115728180A true CN115728180A (en) | 2023-03-03 |
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| CN202211459434.9A Pending CN115728180A (en) | 2022-11-16 | 2022-11-16 | Method for detecting production of lithium battery electrode |
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