CN114739444A - Method for judging state of winding core - Google Patents
Method for judging state of winding core Download PDFInfo
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- CN114739444A CN114739444A CN202210383096.9A CN202210383096A CN114739444A CN 114739444 A CN114739444 A CN 114739444A CN 202210383096 A CN202210383096 A CN 202210383096A CN 114739444 A CN114739444 A CN 114739444A
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- 238000004804 winding Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005259 measurement Methods 0.000 claims description 18
- 238000007731 hot pressing Methods 0.000 claims description 12
- 230000037303 wrinkles Effects 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 229920001342 Bakelite® Polymers 0.000 claims description 3
- 239000004637 bakelite Substances 0.000 claims description 3
- 229910052755 nonmetal Inorganic materials 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 2
- 238000012797 qualification Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
- G01B5/061—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness height gauges
-
- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a method for judging the state of a winding core, which comprises the following steps: opening the side knob, firstly moving the upright column downwards to a horizontal measuring plate to be attached to the base, resetting the digital display instrument, judging whether the self-measuring digital display instrument is intact or not, then lifting the upright column to a proper position, and fixing the upright column by the side knob; taking a winding core which is just wound and is not pre-pressed, and placing the winding core between two longitudinal limiting plates; opening the side knob, moving the upright post downwards until the winding core is contacted with the horizontal measuring plate, screwing down the side knob to fix the upright post, reading the length of the contact part of the winding core and the base on a transverse scale mark, namely the horizontal contact value of the winding core, and recording the length as L1, and reading the height of the winding core on a digital display instrument or a vertical scale mark, and recording the height as L2; obtaining a ratio: a = L1/L2; and (6) judging a winding core. The invention can judge whether the later stage of the winding core is deformed or the pole piece is wrinkled through the quantized data, thereby greatly improving the product performance and the qualification rate.
Description
Technical Field
The invention relates to the technical field of lithium battery manufacturing, in particular to a method for judging a roll core state.
Background
The square aluminum shell battery is divided into a winding process and a lamination process at present, the lamination process is small in internal resistance and excellent in electrical performance but low in efficiency, the consistency of a battery core is likely to be improved, and the winding process is high in production efficiency and good in consistency but low in space utilization rate and high in internal resistance compared with the lamination process. At present, the winding process is mainly used as the mainstream in the industry, the winding core finishes winding through tension regulation, and subsequent operations such as hot pressing and the like are carried out after winding.
At present, the judgment of the wound roll core in the industry is mainly to judge the conditions of tab alignment, up-and-down coating of a positive electrode and a negative electrode, ending coating and the like, and a judgment standard aiming at the internal stress of the roll core does not exist. Aiming at different materials, the stress in the winding core processed by different process parameters is different, the presented winding core state is also different, the winding core can be deformed or folded when the battery is fully charged, the thickness and the electrical property of the battery are further influenced, and the winding core folding is a common problem in the industry, so that a method for judging the winding core state is needed to pre-judge the fully charged winding core state.
Disclosure of Invention
The invention aims to overcome the defects and provides a method for judging the state of a winding core, which is used for pre-judging the state of a full electric winding core according to measurement data.
The purpose of the invention is realized as follows:
a method of determining the state of a winding core comprising the steps of:
step one, measurement preparation: opening the side knob, firstly moving the upright column downwards to a horizontal measuring plate to be attached to the base, resetting the digital display instrument, judging whether the self-measuring digital display instrument is intact or not, then lifting the upright column to a proper position, and fixing the upright column by the side knob;
step two, placing a roll core: taking a winding core which is just wound and is not pre-pressed, and placing the winding core between two longitudinal limiting plates;
step three, data measurement: opening the side knob, moving the upright post downwards until the winding core is contacted with the horizontal measuring plate, screwing down the side knob to fix the upright post, reading the length of the contact part of the winding core and the base on a transverse scale mark, namely the horizontal contact value of the winding core, and recording the length as L1, and reading the height of the winding core on a digital display instrument or a vertical scale mark, and recording the height as L2;
step four, data processing: obtaining a ratio: a = L1/L2;
step five, core winding judgment: the larger the value A is, the more flat the winding core is, the smaller the internal stress after the winding core is wound and is subjected to hot pressing or expansion of the pole piece is, the more difficult the pole piece is to wrinkle, and the more difficult the battery cell is to deform; the smaller the A value is, the more the winding core tends to be circular, the larger the internal stress of the winding core after hot pressing or pole piece expansion is finished, the pole piece is easy to wrinkle, and the electric core is easy to deform.
Preferably, in the third step, the longitudinal scale lines and the digital display instrument read at the same time, the readings are compared, and whether an error exists in the digital display instrument is judged.
Preferably, the measurement accuracy of the transverse scale marks, the longitudinal scale marks and the digital display instrument is 0.1 mm.
Preferably, the base, the upright post, the horizontal measuring plate and the longitudinal limiting plate are made of non-metal materials.
Preferably, the base, the upright post, the horizontal measuring plate and the longitudinal limiting plate are made of bakelite plates, PP or PE.
Preferably, in the second step, the winding core and the longitudinal limiting plate are in mutual contact.
The invention has the beneficial effects that:
1. whether the later-stage deformation of the winding core or the degree of wrinkling of the pole piece can be judged through the quantization data;
2. the device can be applied to battery production and can be used as a quality control means to improve the product performance and the qualification rate;
3. the device reduces the wrinkles of the pole piece and improves the qualified rate of the battery; do benefit to the promotion of battery design, increased the design parameter of battery design dress ratio, increased the capacity and the energy density of battery, reduced manufacturing cost, through data display, under the condition of same dress ratio, roll up core thickness and reduce about 1%.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a front view of fig. 1.
Fig. 3 is a schematic view of the structure of the measurement state.
Wherein: a base 1; horizontal scale lines 1.1; an arch bridge 2; a column 3; a digital display 4; a horizontal measuring plate 5; a longitudinal limit plate 6; longitudinal scale lines 6.1; a side knob 7; a winding core 8.
Detailed Description
Referring to fig. 1-3, the invention relates to a device for judging the state of a roll core, which comprises a base 1, an arch bridge 2, an upright post 3, a digital display instrument 4 and a horizontal measuring plate 5, wherein longitudinal limiting plates 6 are symmetrically arranged on the base 1, longitudinal scale marks 6.1 are arranged on the longitudinal limiting plates 6, a transverse scale mark 1.1 is arranged on the base 1 between the two longitudinal limiting plates 6, the arch bridge 2 is arranged outside the two longitudinal limiting plates 6, the arch bridge 2 is in an inverted U shape, the upright post 3 is arranged in the center of the arch bridge 2, the digital display instrument 4 is arranged at the top of the upright post 3, the horizontal measuring plate 5 is arranged at the bottom of the upright post 3, the upright post 3 is fixed through a side knob 7, and the roll core 8 is horizontally arranged between the two longitudinal limiting plates 6.
The digital display instrument measures the height of the winding core 8, and when the bottom of the horizontal measuring plate 5 is attached to the base 1, the digital display instrument 4 is at a zero position. The longitudinal scale mark 6.1 is also used for measuring the height of the winding core 8, the longitudinal scale mark 6.1 and the digital display instrument 4 can read simultaneously, the readings are compared, whether an error exists in the digital display instrument 4 or not is judged, and the data correction effect is achieved.
The longitudinal limiting plate 6 can move transversely, is suitable for battery cores with different width sizes, and improves the universality of the device.
The measuring accuracy of the transverse scale mark 1.1, the longitudinal scale mark 6.1 and the digital display instrument is 0.1 mm.
The base 1, the upright post 3, the horizontal measurement plate 5 and the longitudinal limiting plate 6 are made of nonmetal materials, static electricity is prevented, plastic materials can be adopted, and bakelite plates, PP or PE are preferably selected.
Because the electric core of winding technology often has the condition that pole piece or book core warp the fold, because the winding technology is rolled up the pole piece of certain length together, lead to more two circular-arc structures than lamination technology, and these two circular-arc structures receive the effect of pole piece inflation when carrying out hot pressing or full electricity, can make the inside very big stress that produces of book core, and the stress uses the pole piece as the carrier, to the inside release of book core, lead to rolling up core or pole piece deformation. When the wound state of the core is similar or close to that of the laminated core, this indicates that the internal stresses are lower and the likelihood of the wrinkles deforming is lower. It is reliable and feasible to obtain quantified data by the tooling fixture to determine whether the core is close to the state of the laminated core (tending towards flatness).
A method for measuring a winding core comprises the following steps:
1. preparation for measurement
First place the device at horizontal position, open the side knob, the stand moves down earlier to the level measurement board and the laminating of base, and the digital display appearance zero clearing, whether the self-test digital display appearance is intact, then lifts to suitable position to place the core and do not hinder as the standard, and it is fixed with the side knob.
2. Roll core placement
Get the core that just convolutes the completion and do not carry out the pre-compaction, electric core whole this moment is oval-shaped, will roll up the core and place between two vertical limiting plates, roll up the core and contact each other with vertical limiting plate for the best, make electric core whole be in natural state.
3. Data measurement
And opening the side knob, downwards moving the upright post to the position where the winding core is contacted with the measuring plate, screwing the side knob to fix the upright post, reading the length of the contact part of the winding core and the base, namely the horizontal contact value of the winding core on the transverse scale mark, recording the horizontal contact value as L1, and reading the height of the winding core on a digital display instrument or a vertical scale mark, recording the height as L2.
4. Data processing
Obtaining a ratio: a = L1/L2.
5. Core determination
The larger the value A is, the more flat the winding core is, the closer the winding core is to the laminated battery, the smaller the internal stress after the hot pressing or the expansion of the pole piece is after the winding of the winding core is finished, the more difficult the pole piece is to wrinkle, and the more difficult the electric core is to deform.
The smaller the A value is, the more the winding core tends to be circular, the larger the internal stress of the winding core after hot pressing or pole piece expansion is finished, the pole piece is easy to wrinkle, and the electric core is easy to deform.
Example 1:
1. preparation for measurement
First place the device at horizontal position, open the side knob, the stand moves down earlier to the level measurement board and the laminating of base, and the digital display appearance zero clearing, whether the self-test digital display appearance is intact, then lifts to suitable position to place the core and do not hinder as the standard, and it is fixed with the side knob.
2. Roll core placement
Taking 48173170 model die-cut positive and negative pole pieces, the positive pole width is 140.5mm (with AT93 mm), the negative pole width is 140.5mm, the positive pole tab width is 36.5mm, the positive pole tab height is 27.5mm, the negative pole tab width is 36.5mm, the negative pole tab height is 36.5mm, the winding tension parameters are as follows:
an initial positive electrode setting tension of 400gf and an initial negative electrode setting tension of 400 gf;
an initial diaphragm set tension of 120gf, an initial lower diaphragm set tension of 120gf,
a minimum positive electrode of 80gf, a minimum negative electrode of 80gf,
get the core that just convolutes the completion and do not carry out the pre-compaction, electric core whole this moment is oval-shaped, will roll up the core and place between two vertical limiting plates, roll up the core and contact each other with vertical limiting plate for the best, make electric core whole be in natural state.
3. Data measurement
And opening the side knob, downwards moving the upright post to the position where the winding core is contacted with the measuring plate, screwing the side knob to fix the upright post, reading the length of the contact part of the winding core and the base, namely the horizontal contact value of the winding core on the transverse scale mark, recording the horizontal contact value as L1, and reading the height of the winding core on a digital display instrument or a vertical scale mark, recording the height as L2.
4. Data processing
Obtaining a ratio: a = L1/L2.
5. Core determination
The larger the value A, the more the winding core tends to be flat; the smaller the value of a, the more rounded the core.
Example 2:
the winding core is wound with the following winding tension parameters:
an initial positive electrode set tension of 480gf and an initial negative electrode set tension of 460 gf;
an initial diaphragm set tension of 120gf, an initial lower diaphragm set tension of 120gf,
a minimum attenuation cutoff of 80gf for the positive electrode, a minimum attenuation cutoff of 80gf for the negative electrode,
the rest of the procedure was the same as in example 1.
Example 3:
the winding core is wound with the following winding tension parameters:
an initial positive electrode set tension 430gf and an initial negative electrode set tension 420 gf;
an initial diaphragm set tension of 120gf, an initial lower diaphragm set tension of 120gf,
a minimum positive electrode of 80gf, a minimum negative electrode of 80gf,
the rest of the procedure was the same as in example 1.
Cores from examples 1-3 were placed in the apparatus for L1, L2 measurements as shown in Table 1 below:
| serial number | L1 value (mm) | L2 value (mm) | A |
| Example 1 | 100.5 | 34.5 | 2.91 |
| Example 2 | 104.6 | 31.1 | 3.36 |
| Example 3 | 100.8 | 34.1 | 2.95 |
The measurement results show that the value A of the example 2 is maximum, the value A of the example 3 is next to the value A, and the value A of the example 1 is minimum.
Experiments prove that:
with the book core of embodiment 1-3, through rolling up a core hot pressing (after electric core carries out the hot pressing, measure the thickness of rolling up behind the core hot pressing, record as L) → roll up the core and tie up the equipment income shell → the battery toasts → battery liquid injection → battery formation → battery secondary liquid injection → battery divides the appearance → full electricity is disassembled and is measured electric core thickness (the battery is full to be filled the back, opens the casing, measures inside single roll core thickness, records as B), roll up core thickness L and the full electricity thickness B measurement of book core with the hot pressing to calculate the rebound rate, see table 2 below:
the data show that the larger the value A is, the whole winding core is flat, and the rebound rate of the winding core is smaller. Example 2 is the best, example 3 times the worst, example 1.
It is shown that example 2 is optimal in both pilot and experimental trials.
Batteries made with the cores of examples 1-3 were subjected to battery cycle life testing as follows:
the battery test shows that the cycle life of the test in example 2 is optimal, which is consistent with the result predicted by the device.
By adopting the device as a quality control means, whether the later stage of the winding core is deformed or whether the pole piece is folded can be judged through quantitative data, and the product performance and the qualification rate are greatly improved.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (6)
1. A method for judging the state of a winding core is characterized in that:
the method comprises the following steps:
step one, measurement preparation: opening the side knob, firstly moving the upright column downwards to a horizontal measuring plate to be attached to the base, resetting the digital display instrument, judging whether the self-measuring digital display instrument is intact or not, then lifting the upright column to a proper position, and fixing the upright column by the side knob;
step two, placing a roll core: taking a winding core which is just wound and is not pre-pressed, and placing the winding core between two longitudinal limiting plates;
step three, data measurement: opening the side knob, moving the upright post downwards until the winding core is contacted with the horizontal measuring plate, screwing down the side knob to fix the upright post, reading the length of the contact part of the winding core and the base on a transverse scale mark, namely the horizontal contact value of the winding core, and recording the length as L1, and reading the height of the winding core on a digital display instrument or a vertical scale mark, and recording the height as L2;
step four, data processing: obtaining a ratio: a = L1/L2;
step five, core judgment: the larger the value A is, the more flat the winding core is, the smaller the internal stress after the winding core is wound and is subjected to hot pressing or expansion of the pole piece is, the more difficult the pole piece is to wrinkle, and the more difficult the electric core is to deform; the smaller the A value is, the more the winding core tends to be circular, the larger the internal stress of the winding core after hot pressing or pole piece expansion is finished, the pole piece is easy to wrinkle, and the electric core is easy to deform.
2. A method of determining the state of a core according to claim 1, characterized in that: and in the third step, the longitudinal scale lines and the digital display instrument read at the same time, the readings are compared, and whether errors exist in the digital display instrument is judged.
3. A method of determining the state of a core according to claim 2, characterized in that: the measurement precision of the transverse scale marks, the longitudinal scale marks and the digital display instrument is 0.1 mm.
4. A method of determining the state of a core according to claim 1, characterized in that: the base, the upright posts, the horizontal measuring plate and the longitudinal limiting plate are made of non-metal materials.
5. The method of claim 4, wherein the determining the core state comprises: the base, the upright post, the horizontal measuring plate and the longitudinal limiting plate are made of bakelite plates, PP or PE.
6. A method of determining the state of a core according to claim 1, characterized in that: and in the second step, the winding core is contacted with the longitudinal limiting plate.
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