CN108258185B - Structure and method for preventing edge bulging during drying of lithium battery negative plate - Google Patents
Structure and method for preventing edge bulging during drying of lithium battery negative plate Download PDFInfo
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- CN108258185B CN108258185B CN201711486597.5A CN201711486597A CN108258185B CN 108258185 B CN108258185 B CN 108258185B CN 201711486597 A CN201711486597 A CN 201711486597A CN 108258185 B CN108258185 B CN 108258185B
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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
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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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- 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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- 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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Abstract
The invention provides a structure and a method for preventing edge bulging when a lithium battery negative plate is dried, which belong to the field of lithium battery processing. The invention can prevent the negative pole piece from bulging or shrinking during the drying process in the coating stage, avoid the occurrence of local overpressure during rolling, effectively reduce the risks of low capacity and lithium precipitation of the battery, improve the manufacturing yield of the battery and reduce the manufacturing cost of the battery.
Description
Technical Field
The invention belongs to the field of lithium ion batteries, and relates to a processing device and a processing method of a lithium battery, in particular to a structure and a method for preventing edge bulging when a lithium battery negative plate is dried.
Background
Lithium ion batteries are used as important energy storage devices in the fields of electric vehicles and energy storage in the future, and are greatly supported by governments and capital markets in recent years, lithium ion battery projects are started as spring shoots after rain, and the construction scale and speed are unprecedentedly developed. In the preparation process of the lithium battery, the negative electrode material needs to be prepared into slurry, then the slurry is coated on the copper foil, in the coating process, a wet film needs to be dried by an oven, in the drying process, the edge of the coating has large gas-liquid contact area and high drying speed, so that the negative electrode slurry of a non-edge coating is easy to transversely transport to the edge area, the edge area is raised, the edge bulging phenomenon occurs, and the performance of electrical performance and the production yield are influenced. How to improve the cathode edge bulging phenomenon and improve the electrical performance and the manufacturing goodness of products is more and more emphasized by various lithium battery manufacturers.
When the negative pole piece used by the power soft package lithium ion secondary battery put on the market at present is coated, the drying speed of the non-edge area of the pole piece is slower than that of the edge area of the wet film pole piece in the drying process, so that the slurry coating in a semi-dry state of the edge area generates micro displacement towards the middle direction of the pole piece, the thickness of the edge area of the pole piece is larger than that of the non-edge area of the pole piece, the coating surface density of the negative pole piece is changed, meanwhile, the pole piece in the edge area of the pole piece and with large thickness is easy to generate the phenomena of overvoltage and bright edge in rolling, the performance of the negative pole piece in the area cannot be normally exerted, and the abnormal conditions of low capacity of the battery, lithium precipitation of the negative pole and the like, which.
Disclosure of Invention
The invention aims to provide a structure and a method for preventing edge bulging when a lithium battery negative electrode plate is dried, which can prevent the edge bulging or edge contraction phenomenon from occurring in the drying process of the negative electrode plate in the coating stage, avoid the occurrence of local over-pressure phenomenon during rolling, effectively reduce the risk of low capacity and lithium precipitation of the battery, improve the manufacturing excellent rate of the battery and reduce the manufacturing cost of the battery.
In order to solve the technical problems, the invention adopts the technical scheme that: prevent structure on drum limit when lithium cell negative pole piece is dried, including drying oven, drying oven's inside is equipped with humidification device, online thickness detection device, infrared induction device, humidity induction device and deionized water atomizing device, the humidification device symmetry is established drying oven's the left and right sides, online thickness detection device establishes perpendicularly directly over the negative pole piece, online thickness detection device sets up the edge in negative pole piece both sides perpendicularly, the edge in the both sides of negative pole piece is established perpendicularly to infrared induction device, the edge in the both sides of negative pole piece is established perpendicularly to humidity induction device, humidification device, online thickness detection device, infrared induction device, humidity induction device and deionized water atomizing device all are connected with central controlling means electricity.
Further, the humidifying device is perpendicular to the negative plate, and the vertical working area of the humidifying device is larger than the thickness of the negative plate.
Furthermore, the vertical distance between the humidifying device and the negative plate is 1-5 cm.
Further, the infrared sensing device generates infrared wavelength between 1000nm and 5000nm, and emission frequency between 10Hz and 60 Hz.
Further, the detection sensitivity of the humidity sensing device is 1% RH, and the detection range is 10% to 90% RH.
Furthermore, the on-line thickness detection device can detect the transverse thickness of the pole piece, the scanning speed is 1cm/s to 10cm/s, and the stepping point interval is 0.5mm to 10 mm.
Furthermore, the online thickness detection device has the thickness detection precision of 0.5 μm and the thickness detection range of 0.5 μm to 500 μm.
Further, the atomization amount of the deionized water atomization device ranges from 1g/h to 100 g/h.
Further, infrared induction system is 1 ~ 6mm apart from the distance of negative plate edge, humidity induction system is 1 ~ 6mm apart from the distance of negative plate edge, and the edge setting that deionized water atomizing device corresponds the negative plate is 1 ~ 6mm apart from the distance of negative plate edge, center controlling means is P L C control program.
By using the method for preventing the edge from being bulged when the lithium battery negative plate is dried,
the first step is as follows: connecting a humidifying device, an online thickness detection device, an infrared sensing device, a humidity sensing device and a deionized water atomization device with a central control device, and setting theoretical parameters, temperature values, humidity values, drying values and other parameters required by drying of the cathode plate in the central control device;
the second step is that: starting a humidifying device and a humidity sensing device, measuring the thickness values of the pole pieces in a non-edge area and an edge area through an online thickness detection device, adjusting the humidity above the pole pieces through a deionized water atomization device, and indirectly adjusting the drying speed of the edge area of the negative pole piece;
the third step: in the continuous feeding process of the negative plate, the humidifying device, the online thickness detection device, the infrared sensing device, the humidity sensing device, the deionized water atomization device and the central control device form a closed-loop system, and parameters are adjusted and detected at any time.
Compared with the prior art, the invention has the advantages and positive effects that: 1. the humidifying device is added in the drying oven, so that the drying speed of the edge of the coating is reduced, the edge bulging phenomenon in the edge area is prevented, the electrochemical performance of the battery is improved, the edge lithium precipitation phenomenon is prevented, the excellent rate of the coating process can be obviously improved, the loss rate is reduced, the market competitiveness of the product is effectively improved, the application in production is facilitated, and the production practice significance is great; 2. comparing the thickness difference between the non-edge area and the edge area acquired by the thickness detection device, combining the humidity value acquired by the humidity acquisition device, and dynamically adjusting the atomization device by the central control device to ensure that the thickness of the non-edge area and the thickness of the edge area of the negative coating are within the specification range; 3. the central control device can dynamically adjust the deionized water atomization device according to the thickness values of the non-edge area and the edge area of the pole piece detected by the online thickness meter, the humidity value detected by the humidity sensing device and the drying degree of the pole piece detected by the infrared detection device, and combines a design value to ensure that the thickness values of the non-edge area and the edge area of the pole piece are consistent with a set value; 4. the corresponding method can effectively improve the edge bulging phenomenon caused by too fast drying of the edge area of the pole piece, effectively improve the excellent rate of the coating process, improve the electrochemical performance of the battery, effectively improve the market competitiveness of the product, facilitate the wide application in production and have great production practice significance.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a structural front view of a lithium battery negative electrode plate edge bulging during drying according to the present invention;
FIG. 2 is a structural plan view of the lithium battery negative plate edge bulging during drying.
Reference numerals:
1-drying the oven; 2-a humidifying device; 3-an online thickness detection device; 4-an infrared sensing device; 5-a humidity sensing device; 6-deionized water atomization device; 7-central control device.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present 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 present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, 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 meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1 and 2, the invention relates to a structure and a method for preventing edge bulging when drying a lithium battery negative plate, comprising a drying oven 1, wherein a humidifying device 2, an online thickness detection device 3, an infrared sensing device 4, a humidity sensing device 5 and a deionized water atomization device 6 are arranged inside the drying oven 1, the humidifying device 2 is symmetrically arranged at the left side and the right side of the drying oven 1, the online thickness detection device 3 is vertically arranged right above the negative plate, the online thickness detection device 3 is vertically arranged at the edges at the two sides of the negative plate, the infrared sensing device 4 is vertically arranged at the edges at the two sides of the negative plate, the humidity sensing device 5 is vertically arranged at the edges at the two sides of the negative plate, the humidifying device 2, the online thickness detection device 3, the infrared sensing device 4, the humidity sensing device 5 and the deionized water atomization device 6 are all electrically connected with a central control device 7, on-line thickness detection device 3, infrared induction system 4, the synteny setting around humidity induction system 5 and the deionized water atomizing device 6, infrared induction system 4 is established at on-line thickness detection device 3's rear, humidity induction system 5 and deionized water atomizing device 6 set up the place ahead at on-line thickness detection device 3, deionized water atomizing device 6 is established in humidity induction system 5's front, if drying rate is too fast, thickness is super-thick, deionized water atomizing device 6 just begins the operation, increase humidity and reduce drying rate.
Preferably, the humidifying device 2 is perpendicular to the negative plate, and the vertical working area of the humidifying device 2 is larger than the thickness of the negative plate, so that the whole negative plate is in a humidifying state, and the balance of a drying environment is favorably ensured; more preferably, the vertical distance between the humidifying device 2 and the negative plate is 1-5 cm, preferably 1.5cm, and the distance is moderate, so that the phenomenon that the distance is too close, the moisture released by the humidifying device 2 is condensed on the negative plate, the temperature is not uniformly distributed, the material moves, and the phenomenon that the distance is too far, and the efficiency is reduced can be avoided.
Preferably, the infrared wavelength generated by the infrared sensing device 4 is between 1000nm and 5000nm, the emission frequency is between 10HZ and 60HZ, preferably 2000nm, the frequency is 35HZ, the drying degree of the edge area of the pole piece can be detected through infrared waves, the pole piece is ensured to be completely dried when being taken out of the oven, corresponding parameters are set, the detection effect is good, and the accuracy is high.
Preferably, the humidity sensing device 5 has a detection sensitivity of 1% RH and a detection range of 10% to 90% RH, and on the premise of meeting the detection requirements, the qualified specification is selected, thereby reducing the cost of the device.
Preferably, the on-line thickness detection device 3 can detect the transverse thickness of the pole piece, the scanning speed is 1cm/s to 10cm/s, preferably 5.510cm/s, the stepping point interval is 0.5mm to 10mm, preferably 0.58mm, the scanning precision is high, the detection precision is high, the scanning speed is too high, the interval is too large, the precision is reduced, the scanning speed is too slow, the efficiency is too low, the parameters cannot be adjusted in time, and the material can move easily before adjustment; more preferably, the online thickness detection device 3 has a thickness detection precision of 0.5 μm and a thickness detection range of 0.5 μm to 500 μm, so as to improve the detection precision.
Preferably, the deionized water atomization device 6 has the atomization amount ranging from 1g/h to 100g/h, preferably 62g/h, the deionized water atomization amount can be adjusted according to the setting parameters and the compensation parameters of the central control device, the humidity value above the edge area of the pole piece is ensured to be consistent with the output value of the central control device, the atomization amount is high in precision, and the precision and the reliability of the whole device are improved.
Preferably, the distance of 4 distance negative pole piece edges of infrared induction system is 1 ~ 6mm, preferably 2.8mm, the distance of 5 distance negative pole piece edges of humidity induction system is 1 ~ 6mm, preferably 2.8mm, the edge that deionized water atomizing device 6 corresponds the negative pole piece sets up the distance of distance negative pole piece edge and is 1 ~ 6mm, preferably 2.8mm, set up suitable position, can guarantee the detection accuracy of parameter, can in time feed back real-time parameter to central controlling means 7, convenient in time adjustment, stroke loop control precision is high, the reflex arc end, the reaction is rapid, it is more accurate to control, central controlling means 7 is P L C control program, this procedure is simple, the debugging is convenient and easy to get on hand, easy to learn, staff's training cost is low.
The method for preventing the edge from being bulged during the drying of the lithium battery negative plate comprises the following steps: the humidifying device 2, the online thickness detection device 3, the infrared sensing device 4, the humidity sensing device 5 and the deionized water atomization device 6 are connected with the central control device 7, and theoretical parameters required by drying of the negative plate, such as a temperature value, a humidity value and a drying value, are set in the central control device 7;
the second step is that: starting the humidifying device 2 and the humidity sensing device 5, measuring the thickness values of the pole pieces in the non-edge region and the edge region through the online thickness detection device 3, adjusting the humidity above the pole pieces through the deionized water atomization device 6, and indirectly adjusting the drying speed of the edge region of the negative pole piece;
the third step: in the process of the second step, the temperature of the drying oven 1 is 90 ℃, and the drying time is 8 hours;
the fourth step: when the detection value of the infrared induction device 4 reaches the parameter set by the central control device 7, feeding the negative pole piece continuously;
the fifth step: in the continuous feeding process of the cathode plate, the humidifying device 2, the online thickness detection device 3, the infrared sensing device 4, the humidity sensing device 5, the deionized water atomization device 6 and the central control device 7 form a closed-loop system, and parameters are adjusted and detected at any time.
In the actual application process, the drying speed of the edge area of the pole piece is adjusted by adjusting the humidity of the edge area of the pole piece, and the material transportation of the pole piece in the transverse direction is reduced, so that the phenomenon that the thickness of the edge of the pole piece is larger than the thickness of a main body is prevented, the phenomenon that the process goodness and the battery performance are influenced due to the edge bulging phenomenon is avoided, the probability of edge bulging in the coating process of the negative pole piece can be effectively reduced, and the phenomena of low capacity and lithium precipitation caused by overpressure during rolling are prevented.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (9)
1. Prevent the structure on drum limit when lithium cell negative pole piece is dried, its characterized in that: including drying oven, drying oven's inside is equipped with humidification device, online thickness detection device, infrared induction device, humidity induction device and deionized water atomizing device, the humidification device symmetry is established drying oven's the left and right sides, online thickness detection device establishes perpendicularly directly over the negative pole piece, online thickness detection device sets up the edge in the negative pole piece both sides perpendicularly, the edge in the both sides of negative pole piece is established perpendicularly to infrared induction device, the edge in the both sides of negative pole piece is established perpendicularly to humidity induction device, humidification device, online thickness detection device, infrared induction device, humidity induction device and deionized water atomizing device all are connected with maincenter controlling means electricity, deionized water atomizing device, atomizing volume scope 1g/h to 100 g/h.
2. The structure for preventing the edge from being bulged when the lithium battery negative electrode sheet is dried according to claim 1, characterized in that: the humidifying device is perpendicular to the negative plate, and the vertical working area of the humidifying device is larger than the thickness of the negative plate.
3. The structure for preventing the edge from being bulged when the lithium battery negative electrode sheet is dried according to claim 1, characterized in that: the vertical distance between the humidifying device and the negative plate is 1-5 cm.
4. The structure for preventing the edge from being bulged when the lithium battery negative electrode sheet is dried according to claim 1, characterized in that: the infrared wavelength generated by the infrared sensing device is between 1000nm and 5000nm, and the emission frequency is between 10HZ and 60 HZ.
5. The structure for preventing the edge from being bulged when the lithium battery negative electrode sheet is dried according to claim 1, characterized in that: the detection sensitivity of the humidity sensing device is 1% RH, and the detection range is 10% to 90% RH.
6. The structure for preventing the edge from being bulged when the lithium battery negative electrode sheet is dried according to claim 1, characterized in that: the on-line thickness detection device can detect the transverse thickness of the pole piece, the scanning speed is 1cm/s to 10cm/s, and the stepping interval is 0.5mm to 10 mm.
7. The structure for preventing the edge from being bulged when the lithium battery negative electrode sheet is dried according to claim 1, characterized in that: the online thickness detection device has the thickness detection precision of 0.5 mu m and the thickness detection range of 0.5 mu m to 500 mu m.
8. The structure for preventing the edge bulging of the lithium battery negative plate during drying according to claim 1, wherein the distance from the infrared sensing device to the edge of the negative plate is 1-6 mm, the distance from the humidity sensing device to the edge of the negative plate is 1-6 mm, the distance from the deionized water atomization device corresponding to the edge of the negative plate is 1-6 mm, and the central control device is a P L C control program.
9. The method for preventing the edge bulging structure of the lithium battery negative electrode sheet during drying as claimed in claim 1, wherein:
the first step is as follows: connecting a humidifying device, an online thickness detection device, an infrared sensing device, a humidity sensing device and a deionized water atomization device with a central control device, and setting theoretical parameters, temperature values, humidity values and drying value parameters required by drying of the cathode plate in the central control device;
the second step is that: starting a humidifying device and a humidity sensing device, measuring the thickness values of the pole pieces in a non-edge area and an edge area through an online thickness detection device, adjusting the humidity above the pole pieces through a deionized water atomization device, and indirectly adjusting the drying speed of the edge area of the negative pole piece;
the third step: in the continuous feeding process of the negative plate, the humidifying device, the online thickness detection device, the infrared sensing device, the humidity sensing device, the deionized water atomization device and the central control device form a closed-loop system, and parameters are adjusted and detected at any time.
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| CN111146399A (en) * | 2019-12-12 | 2020-05-12 | 东莞维科电池有限公司 | Closed-loop adjusting method for coating surface density |
| CN112495727A (en) * | 2020-01-16 | 2021-03-16 | 深圳市新嘉拓自动化技术有限公司 | Preparation process and system for preventing edge cracking of pole piece |
| CN111539429B (en) * | 2020-06-19 | 2020-11-03 | 天津施格机器人科技有限公司 | Automatic circulation box positioning method based on image geometric features |
| CN113299878B (en) * | 2021-05-21 | 2023-12-19 | 珠海冠宇电池股份有限公司 | Negative plate and application thereof |
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| CN102607240A (en) * | 2012-03-06 | 2012-07-25 | 宁德新能源科技有限公司 | Drying equipment and drying method for lithium ion battery electrodes |
| CN105576186A (en) * | 2015-12-17 | 2016-05-11 | 中天储能科技有限公司 | Novel baking method and control system |
| CN206163605U (en) * | 2016-11-07 | 2017-05-10 | 宁德时代新能源科技股份有限公司 | Pole piece drying device that colds pressing |
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| CN102607240A (en) * | 2012-03-06 | 2012-07-25 | 宁德新能源科技有限公司 | Drying equipment and drying method for lithium ion battery electrodes |
| CN105576186A (en) * | 2015-12-17 | 2016-05-11 | 中天储能科技有限公司 | Novel baking method and control system |
| CN206163605U (en) * | 2016-11-07 | 2017-05-10 | 宁德时代新能源科技股份有限公司 | Pole piece drying device that colds pressing |
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Effective date of registration: 20210129 Address after: Room 1713, building 1, Photovoltaic Science and Technology Innovation Park, 1288 Kanghe Road, Gaozhao street, Xiuzhou District, Jiaxing City, Zhejiang Province, 314031 Patentee after: Jiewei power industry Jiaxing Co.,Ltd. Address before: No.11, Kaiyuan Road, Xiqing automobile industrial zone, Xiqing District, Tianjin 300380 Patentee before: TIANJIN EV ENERGIES Co.,Ltd. |