CN111721644A - Tool and method for detecting flexibility of surface-coated pole piece - Google Patents
Tool and method for detecting flexibility of surface-coated pole piece Download PDFInfo
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- CN111721644A CN111721644A CN202010725779.9A CN202010725779A CN111721644A CN 111721644 A CN111721644 A CN 111721644A CN 202010725779 A CN202010725779 A CN 202010725779A CN 111721644 A CN111721644 A CN 111721644A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a tool for detecting flexibility of a surface-coated pole piece, which comprises a feeding platform for placing the pole piece, a measuring platform for measuring the flexibility of the pole piece and a pressing roller assembly, wherein the feeding platform and the measuring platform are sequentially and horizontally arranged, the pressing roller assembly comprises an upper pressing roller and a lower supporting roller which are arranged at intervals up and down, the upper pressing roller and the lower supporting roller are respectively positioned above and below the feeding platform, and the rotating directions of the upper pressing roller and the lower supporting roller are opposite. The method for detecting the flexibility of the pole piece by using the detection tool can judge and detect the flexibility of the pole piece after surface coating, reduce the probability of pole piece blocking and pole piece wrinkling, reduce the experimental investment, is suitable for batch detection of a production line, and can reverse whether the drying parameters of surface coating are reasonable or not.
Description
Technical Field
The invention belongs to the field of power battery pole piece manufacturing, and particularly relates to a tool and a method for detecting flexibility of a pole piece after surface coating.
Background
The safety performance and the service life of the lithium ion battery are always the focus of attention, particularly, the rapid development and application of the power battery enable people to pay more attention to the safety performance and the service life of the lithium ion battery, the improvement of the performance of the power battery is more urgent, the professional personnel of the lithium ion battery also make continuous efforts, and the surface coating process of the pole piece is generated.
The soft-package laminated battery is developed rapidly in recent years and is mainly characterized in that the energy density is 10-15% higher than that of a steel-shell battery with the same specification and size and 5-10% higher than that of an aluminum-shell battery; the strength of the shell is low, the mechanical stress generated to the internal structure in the circulating process is small, and the shell is beneficial to the circulating life; the position of the lug is abundant, and heat is uniformly distributed in the charging and discharging process; the internal resistance is lower, and higher multiplying power charge and discharge can be realized. At present, a laminated battery mainly adopts a hardware die cutting technology, a continuous pole roll is firstly die-cut on a pole lug part, then a single pole piece is separated in a cutter mode, the pole piece before separation is sent forward by a driving roller pinch pole piece, and the single pole piece after separation is sent by a negative pressure belt.
Because the surface coating is very thin, has the influence of active material coating moreover, adopts traditional mode of measuring the volume of volatilizing, can't detect out whether effective stoving of surface coating, and trace NMP not only has the influence to final electric core performance, has huge influence to the pliability of pole piece moreover, directly leads to the pole piece to die cutting process putty in the transfer process and scrap.
The patent CN207675691U discloses an intelligent NMP gas monitoring system, which can detect the NMP content, but uses a gas sensor, so that the cost is high and the periodic maintenance cost is high; CN104535689A A lithium ion battery pole piece N-methyl pyrrolidone content gas chromatography detection method, can quantitatively determine NMP content, but the equipment cost is high, only can be used for scientific research, not suitable for and volume production line batch detection; the minimum winding needle diameter phi and the sagging height of the pole piece respectively used by CN 109443947A, CN110455642A judge the flexibility of the pole piece, but the pole piece is only suitable for judging the rolling and winding pole piece, is not suitable for the die cutting procedure of the laminated battery, and is not suitable for the pole piece with surface coating.
Disclosure of Invention
In view of the above, the invention provides a tool and a method for detecting flexibility of a surface-coated pole piece, which can determine and detect the flexibility of the surface-coated pole piece, reduce the probability of pole piece belt blocking and pole piece wrinkling, reduce the experimental investment, are suitable for batch detection of a production line, and can reverse whether the drying parameters of surface coating are reasonable or not.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the utility model provides a detection frock of pole piece pliability after surface coating, including the feeding platform that is used for placing the pole piece that level sets up in proper order, be used for measuring the measuring platform of pole piece pliability, still include the compression roller subassembly, the compression roller subassembly includes last compression roller, the lower backup roll that upper and lower interval set up, goes up the compression roller and is located respectively with the lower backup roll feeding platform's top, below, the rotation opposite direction of going up compression roller and lower backup roll.
Furthermore, the top surface of the feeding platform is a smooth plane.
Further, the upper press roll is made of rubber materials.
Further, the roughness of the outer surface of the lower supporting roller is 3.2-0.8 μm.
Further, the vertical distance between the bottom of the upper pressing roller and the top of the lower pressing roller is 150-200 mm.
Furthermore, the upper compression roller rotates anticlockwise under the driving of the motor, the lower supporting roller rotates clockwise under the driving of the motor, and the synchronous rotation of the upper compression roller and the lower supporting roller drives the pole piece to move from the feeding platform to the measuring platform.
The upper compression roller is made of rubber and has certain elasticity, so that the pole piece can be pressed and sent out; the lower press roll is preferably made of stainless steel materials, so that the linear speed can be guaranteed to be fixed.
Further, the roughness of the top surface of the measuring platform is 60-90 μm.
Further, the top surface of the measuring platform is preferably a plane made of rubber.
Furthermore, the front side and the rear side of the top of the measuring platform are both upwards provided with bulges.
The front side and the rear side of the top of the measuring platform are both provided with protrusions upwards, so that the advancing direction of the pole piece is prevented from deviating or changing.
Further, the width of the measuring platform is 150mm and the length is 250mm and 350 mm.
Further, the width of the pole piece is smaller than that of the measuring platform.
Furthermore, the width of the pole piece is 80-120mm, and the length is 150-250 mm.
A method for detecting the flexibility of a pole piece after surface coating comprises the following steps:
(1) placing a surface-coated pole piece to be detected on a feeding platform, wherein the pole piece is positioned between an upper pressing roller and a lower supporting roller;
(2) the starting motor drives the lower supporting roll to rotate clockwise at a constant speed and the upper pressing roll to rotate synchronously anticlockwise, and the upper pressing roll drives the pole pieces to move towards the measuring platform until the pole pieces all leave the feeding platform;
(3) and recording the position A of the feeding end of the pole piece on the measuring platform, measuring the horizontal distance between the position A and the symmetrical center of the upper press roll, and judging the flexibility of the pole piece according to the horizontal distance.
Because the measuring platform has certain friction, pole pieces with different flexibilities can form different pole piece waves after leaving the compression roller assembly, and the pole pieces are bent. The pole pieces with different drying degrees have different flexibilities, so the pole pieces with different flexibilities have different bending degrees on the measuring platform
Further, the linear speed of the lower supporting roller is 5-20m/min
Further, the linear speed of the lower supporting roller is preferably 11-15 m/min.
The manufacturing process of the surface coating pole piece comprises the following steps: the active substance is coated on the pole piece and then dried, the residual water solvent content of the pole piece is measured after drying, when the residual water solvent content is lower than 0.3%, the pole piece is rolled, and the pole piece after compaction is subjected to surface coating and drying to obtain the pole piece before die cutting, namely the pole piece suitable for feeding of the detection tool.
Further, the compaction density is 1.45-1.55g/cm 3.
Compared with the prior art, the tool and the method for detecting the flexibility of the surface-coated pole piece, which are provided by the invention, have the following advantages:
(1) the tool and the method for detecting the flexibility of the surface-coated pole piece can judge and detect the flexibility of the surface-coated pole piece, reduce the probability of belt blocking and wrinkle of the pole piece, reduce the experimental investment, are suitable for batch detection of a production line, and can reverse whether the drying parameters of surface coating are reasonable or not.
(2) The tool and the method for detecting the flexibility of the surface-coated pole piece can judge the flexibility of the surface-coated pole piece, reduce the tape blocking reject ratio of a die cutting process, reduce the purchase of experimental equipment and a gas sensor and greatly reduce the cost.
(3) The tool and the method for detecting the flexibility of the surface-coated pole piece are suitable for judging the state of the pole piece in the hardware die cutting process of the laminated battery, are suitable for the surface-coated pole piece of a graphite negative electrode material and the surface-coated pole piece of a silicon-carbon negative electrode material, are simple and easy to operate, save time and can be used for batch production detection.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
fig. 1 is a schematic view of a detection tool according to an embodiment of the present invention.
Description of reference numerals:
1-a feeding platform; 2-a press roll assembly; 21-upper press roll; 22-lower support roll; 3-pole piece; 4-a measuring platform; 5-supporting the feet.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Unless otherwise specifically stated or limited, the term "fixedly connected" may be a commonly used fixedly connected manner such as a plug, a weld, a threaded connection, a bolt connection, etc. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
Example 1
Taking 3 graphite negative electrode surface coating pole pieces 3, wherein the width is 267mm, the length is 200mm, taking 3 samples of the same batch of pole pieces 3, setting the linear velocity of a lower support roller to be 11m/min, putting the pole pieces 3 on a feeding platform 1 between an upper pressing roller 21 and the lower support roller, and conveying the pole pieces 3 to a measuring platform 4 under the driving of the upper pressing roller 21 until the pole pieces 3 all leave the feeding platform 1. And recording the position A of the feeding end of the pole piece 3 on the measuring platform 4, measuring the horizontal distance between the position A and the symmetrical center of the upper press roll 21, and judging the flexibility of the pole piece 3 according to the horizontal distance.
The pole pieces 3 with different NMP contents obtained by using different surface coating speeds have different flexibilities, so that the pole pieces 3 with different flexibilities have different bending degrees on the measuring platform 4, the horizontal distances between the measuring position A and the symmetrical center of the upper press roller 21 are also different, the subsequent die cutting effect is tracked again, and the times of belt blocking are obviously different. Specific experimental data and results are shown in table 1 below.
Table 1 experimental data and results tabulation of example 1
From table 1, it can be known that the higher the coating speed is, the higher the NMP content in the obtained pole piece is, so the better the flexibility of the pole piece is, and the greater the bending degree of the pole piece on the measuring platform is, so the smaller the horizontal distance between the position a of the feeding end of the measured pole piece on the measuring platform and the symmetric center of the upper press roll is, the smaller the die cutting effect of the subsequent pole piece is tracked again, and experiments prove that the more the band blocking times of the pole piece are.
Therefore, the testing tool and the testing method can rapidly and conveniently judge and detect the flexibility of the surface-coated pole piece, reduce the probability of pole piece blocking and pole piece wrinkling, reduce the experimental investment, are suitable for batch detection of a production line, and can reverse whether the drying parameters of surface coating are reasonable or not.
Example 2
Taking 3 samples of silicon-carbon negative pole surface coating pole pieces 3 with width 267mm and length 150mm, taking 3 samples of the same batch of pole pieces 3, setting the linear speed of a lower support roller to be 11m/min, putting the pole pieces 3 into an upper press roller 21, and conveying the pole pieces 3 to a measuring platform 4 until all the pole pieces 3 leave a feeding platform 1. And recording the position A of the feeding end of the pole piece 3 on the measuring platform 4, measuring the horizontal distance between the position A and the symmetrical center of the upper press roll 21, and judging the flexibility of the pole piece 3 according to the horizontal distance.
The pole pieces 3 with different NMP contents obtained by using different surface coating speeds have different flexibilities, so that the pole pieces 3 with different flexibilities have different bending degrees on the measuring platform 4, the horizontal distances between the measuring position A and the symmetrical center of the upper press roller 21 are also different, the subsequent die cutting effect is tracked again, and the times of belt blocking are obviously different. Specific experimental data and results are shown in table 2 below.
Table 2 experimental data and results tabulation of example 2
From table 2, it can be known that the higher the coating speed is, the higher the NMP content in the obtained pole piece is, so the better the flexibility of the pole piece is, and the greater the bending degree of the pole piece on the measuring platform is, so the smaller the horizontal distance between the position a of the feeding end of the measured pole piece on the measuring platform and the symmetric center of the upper press roll is, the smaller the die cutting effect of the subsequent pole piece is tracked again, and experiments prove that the more the band blocking times of the pole piece are.
Therefore, the testing tool and the testing method can rapidly and conveniently judge and detect the flexibility of the surface-coated pole piece, reduce the probability of pole piece blocking and pole piece wrinkling, reduce the experimental investment, are suitable for batch detection of a production line, and can reverse whether the drying parameters of surface coating are reasonable or not.
Comparative example 1
Taking three-element positive pole pieces with width of 264mm and length of 200mm, taking 3 samples of the same batch of pole pieces, setting the linear speed of a lower support roller to be 15m/min, putting the pole pieces on a feeding platform between an upper pressing roller and the lower support roller, and driving the pole pieces to be fed to a measuring platform by the upper pressing roller.
The pole pieces with different NMP contents are obtained at different surface coating speeds, and due to the fact that the positive pole piece is high in hardness, the pole pieces are fed to the maximum distance and have no difference, the die cutting effect is tracked, and the situation of belt blocking is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a detection frock of pole piece pliability after surface coating which characterized in that: including feeding platform (1) that is used for placing pole piece (3), measuring platform (4) that are used for measuring pole piece (3) pliability that level set up in proper order, still include compression roller assembly (2), compression roller assembly (2) are including last compression roller (21), the lower backup roll (22) that upper and lower interval set up, go up compression roller (21) and lower backup roll (22) and are located feeding platform (1)'s top, below respectively, the rotation direction of going up compression roller (21) and lower backup roll (22) is opposite.
2. The tool for detecting the flexibility of the surface-coated pole piece of claim 1, wherein the tool comprises: the top surface of the feeding platform (1) is a smooth plane.
3. The tool for detecting the flexibility of the surface-coated pole piece of claim 1, wherein the tool comprises: the upper pressing roller (21) is a pressing roller made of rubber materials.
4. The tool for detecting the flexibility of the surface-coated pole piece of claim 1, wherein the tool comprises: the roughness of the outer surface of the lower supporting roller (22) is 3.2-0.8 mu m.
5. The tool for detecting the flexibility of the surface-coated pole piece of claim 1, wherein the tool comprises: the vertical distance between the bottom of the upper compression roller (21) and the top of the lower support roller (22) is 150-200 mm.
6. The tool for detecting the flexibility of the surface-coated pole piece of claim 1, wherein the tool comprises: the upper pressing roller (21) rotates anticlockwise under the driving of the motor, the lower supporting roller (22) rotates clockwise under the driving of the motor, and the synchronous rotation of the upper pressing roller (21) and the lower supporting roller (22) drives the pole piece (3) to move towards the measuring platform (4) from the feeding platform (1).
7. The tool for detecting the flexibility of the surface-coated pole piece of claim 1, wherein the tool comprises: the roughness of the top surface of the measuring platform (4) is 60-90 mu m.
8. The tool for detecting the flexibility of the surface-coated pole piece of claim 1, wherein the tool comprises: the front side and the rear side of the top of the measuring platform (4) are both provided with bulges upwards.
9. The method for detecting the flexibility of the pole piece by using the tool for detecting the flexibility of the pole piece after surface coating according to any one of claims 1 to 8 is characterized in that: the method comprises the following steps:
(1) placing a surface-coated pole piece (3) to be detected on a feeding platform (1), wherein the pole piece (3) is positioned between an upper pressing roller (21) and a lower supporting roller (22);
(2) a motor is started to drive a lower supporting roller (22) to rotate clockwise at a constant speed and an upper pressing roller (21) to synchronously rotate anticlockwise, and the upper pressing roller (21) drives the pole piece (3) to move towards the measuring platform (4) until the pole piece (3) completely leaves the feeding platform (1);
(3) and recording the position A of the feeding end of the pole piece (3) on the measuring platform (4), measuring the horizontal distance between the position A and the symmetrical center of the upper pressing roller (21), and judging the flexibility of the pole piece (3) according to the horizontal distance.
10. The method for detecting the flexibility of the surface-coated pole piece according to claim 9, wherein the method comprises the following steps: the linear speed of the lower supporting roller (22) is 5-20 m/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010725779.9A CN111721644A (en) | 2020-07-24 | 2020-07-24 | Tool and method for detecting flexibility of surface-coated pole piece |
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| CN202010725779.9A CN111721644A (en) | 2020-07-24 | 2020-07-24 | Tool and method for detecting flexibility of surface-coated pole piece |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113471400A (en) * | 2021-06-30 | 2021-10-01 | 惠州市恒泰科技股份有限公司 | Method for detecting flexibility of lithium battery pole piece |
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- 2020-07-24 CN CN202010725779.9A patent/CN111721644A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113471400A (en) * | 2021-06-30 | 2021-10-01 | 惠州市恒泰科技股份有限公司 | Method for detecting flexibility of lithium battery pole piece |
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