CN114914404A - Dry method electrode production method and device - Google Patents
Dry method electrode production method and device Download PDFInfo
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- CN114914404A CN114914404A CN202210527372.4A CN202210527372A CN114914404A CN 114914404 A CN114914404 A CN 114914404A CN 202210527372 A CN202210527372 A CN 202210527372A CN 114914404 A CN114914404 A CN 114914404A
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- 238000002156 mixing Methods 0.000 claims abstract description 47
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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
-
- 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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- 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
Abstract
The invention provides a dry method electrode production method and a device, wherein the method comprises the following steps: respectively carrying out grading treatment on a preset active material and a conductive agent, and sequentially carrying out drying treatment and mixing treatment on the raw materials to obtain an initial mixed material; the raw materials consist of preset active materials, conductive agents and binders with molecular weight larger than a first preset threshold value, wherein the preset active materials, the conductive agents and the binders are reserved after grading treatment; performing molecular orientation treatment on the initial mixed material to obtain a target mixed material; carrying out hot-press molding treatment on the target mixed material by using a heating roller to form an electrode film; pressing the electrode film and the current collector by using the heating roller to obtain an electrode plate; the method realizes uniform mixing of raw materials and sufficient orientation of the binder, and is favorable for improving the production quality of the electrode plate of the lithium ion battery.
Description
Technical Field
The invention relates to the technical field of lithium ion battery electrode production, in particular to a dry method electrode production method and a dry method electrode production device.
Background
The traditional lithium ion battery electrode adopts a wet process combining processes of coating, drying and the like, so that the process route is long and the production efficiency is low; the equipment is complicated, the energy consumption is high, and especially the energy consumption consumed by the drying part is high. The organic solvent in the production process has the pollution discharge problem, and the environmental protection property is poor; the electrode compactness is lower. Since the wet forming process uses a solvent to form a binder layer with a binder, the entire particles of the active material are surrounded by the binder layer, contact between the active materials and between the particles of the conductive agent is hindered, the conductivity of the electrode is poor, and the solvent remaining in the electrode undergoes a side reaction with the electrolyte, resulting in degradation of battery performance, such as reduction in capacity, generation of gas, life decay, and the like.
And no solvent is used in the dry forming process, the binder exists in a fiber state, the contact between active materials and between the active materials and conductive agent particles is tighter, the electrode density is high, the conductivity is good, and the capacity is high. The dry molding process does not use any solvent, is an environment-friendly green process, saves the production cost of materials, time, labor and the like, and has higher commercial practical application value. Therefore, dry processes are increasingly used in the field to produce lithium ion battery electrodes.
However, in the electrode production dry process in the prior art, the electrode material, the conductive agent and the like have large particle size distribution range in the production process and are not easy to be mixed uniformly; and the defects of high orientation difficulty of the binder, strict requirements on process conditions, difficulty in full orientation and the like; thereby the production quality of the electrode slice can not be ensured.
Disclosure of Invention
In view of the above, the invention provides a dry method electrode production method and device, which can realize uniform mixing of raw materials and sufficient orientation of a binder, and is beneficial to improving the production quality of electrode plates of lithium ion batteries.
According to one aspect of the present invention, there is provided a dry method electrode production method comprising the steps of:
s110, respectively carrying out grading treatment on a preset active material and a conductive agent, and sequentially carrying out drying treatment and mixing treatment on the raw materials to obtain an initial mixed material; the raw materials consist of preset active materials, conductive agents and binders with molecular weight larger than a first preset threshold value, wherein the preset active materials, the conductive agents and the binders are reserved after grading treatment;
s120, performing molecular orientation treatment on the initial mixed material to obtain a target mixed material;
s130, performing hot-press molding treatment on the target mixed material by using a heating roller to form an electrode film; and
and S140, pressing the electrode film and the current collector by using the heating roller to obtain the electrode sheet.
Optionally, step S110 includes:
and mixing the dried materials obtained after the drying treatment under the environmental condition of being lower than the first preset temperature to obtain initial mixed materials.
Optionally, a step between step S110 and step S120 is further included:
carrying out heat preservation treatment on the initial mixed material under the environment condition of a second preset temperature; the second preset temperature is greater than the first preset temperature.
Optionally, step S110 includes:
mixing the preset active material and the conductive agent to obtain a first mixed material;
and mixing the first mixed material and the binder to obtain an initial mixed material.
Optionally, the heating roller is an electromagnetic induction heating roller, and the roundness of the heating roller at the process temperature is less than or equal to a second preset threshold; and the temperature distribution precision of the heating roller in the working width is a third preset threshold value.
Optionally, step S130 includes:
carrying out hot-pressing treatment on the target mixed material by using a first heating roller and a second heating roller to obtain an initial polar film;
shaping the initial pole film by using the second heating roller and the third heating roller to obtain an electrode film; the first heating roller, the second heating roller, and the third heating roller form a triangular structure.
Optionally, the first heating roller and the second heating roller have different rotational linear speeds, and the second heating roller and the third heating roller have the same rotational linear speed.
Optionally, step S120 includes:
carrying out shearing dispersion treatment on the initial mixed material by using supersonic airflow to obtain a target mixed material; wherein the feeding speed of the initial mixed material ranges from 1 liter/hour to 200 liters/hour, the pressure of the supersonic airflow ranges from 0.5MPa to 1.2MPa, and the flow speed of the supersonic airflow ranges from 1m to 45m 3 /min。
Optionally, the binder is a fluoropolymer.
According to another aspect of the present invention, there is provided a dry electrode production apparatus for carrying out any one of the above dry electrode production methods, the apparatus comprising:
the mixing unit is used for carrying out grading treatment on a preset active material and a conductive agent respectively, and drying treatment and mixing treatment are carried out on the raw materials in sequence to obtain an initial mixed material; the raw materials consist of preset active materials, conductive agents and binders with molecular weight larger than a first preset threshold value, wherein the preset active materials, the conductive agents and the binders are reserved after grading treatment;
the molecular orientation unit is used for performing molecular orientation treatment on the initial mixed material to obtain a target mixed material;
the hot-press forming unit is used for carrying out hot-press forming treatment on the target mixed material by using a heating roller to form an electrode film; and
and the compound unit is used for pressing the electrode film and the current collector by using the heating roller to obtain the electrode plate.
Optionally, the mixing unit comprises a first classification unit, a first mixing unit and a second mixing unit; the first grading unit is used for grading preset active materials and conductive agents respectively; the first mixing unit is used for mixing the preset active material and the conductive agent which are reserved after grading treatment to obtain a first mixed material; the second mixing unit is used for mixing the first mixed material and the binder to obtain an initial mixed material.
Optionally, the heating roller is an electromagnetic induction heating roller, and the roundness of the heating roller at the process temperature is less than or equal to a second preset threshold; and the temperature distribution precision of the heating roller in the working width is a third preset threshold value.
Optionally, the hot press forming unit comprises a first heating roller, a second heating roller and a third heating roller which are distributed in a triangular structure;
the first heating roller and the second heating roller carry out hot-pressing treatment on the target mixed material to obtain an initial polar film;
and the second heating roller and the third heating roller are used for shaping the initial electrode film to obtain an electrode film.
Optionally, the first heating roller and the second heating roller have different rotational linear speeds, and the second heating roller and the third heating roller have the same rotational linear speed.
Optionally, the molecular orientation unit performs shearing dispersion treatment on the initial mixed material by using supersonic airflow to obtain a target mixed material; wherein the feeding speed of the initial mixed material ranges from 1 liter/hour to 200 liters/hour, the pressure of the supersonic airflow ranges from 0.5MPa to 1.2MPa, and the flow speed of the supersonic airflow ranges from 1m 3 /min～45m 3 /min。
Compared with the prior art, the invention has the beneficial effects that:
the dry method electrode production method and the device provided by the invention adopt the dry method material mixing and hot calendaring film forming modes to manufacture the required positive and negative electrode plates of the battery, have simple process and are beneficial to improving the production efficiency of the electrode plates; selecting a preset active material in a proper range based on classification treatment, so that the raw materials are uniformly mixed to avoid phase separation or phase surrounding; on the other hand, the screened adhesive can be fully oriented; thereby ensuring the production quality of the electrode plate of the lithium ion battery.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic structural diagram of a dry electrode production apparatus disclosed in an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a dry electrode production method according to an embodiment of the present invention;
FIG. 3 is a schematic view of a part of the structure of a hot press molding machine set in a dry method electrode production apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic view showing a partial structure of a hot press molding machine set in a dry process electrode manufacturing apparatus according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of a compounding unit in a dry electrode production apparatus according to an embodiment of the present invention;
FIG. 6 is a schematic flow chart of a dry electrode production process according to another embodiment of the present invention;
FIG. 7 is a schematic flow chart of a dry electrode production process according to another embodiment of the present invention;
FIG. 8 is a schematic view showing a partial structure of a hot press molding machine set in a dry process electrode manufacturing apparatus according to another embodiment of the present invention;
fig. 9 is a schematic flow chart of a dry-method electrode production method disclosed in another embodiment of the invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, materials, devices, etc. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising," "having," and "providing" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.
The embodiment of the invention discloses a dry-method electrode production method and a dry-method electrode production device, which are used for producing electrodes of lithium ion batteries by adopting a dry-method process. Referring to fig. 1, the above-described dry electrode production apparatus 1 includes: a mixing unit 11, a molecular orientation unit 12, a hot-press forming unit 13 and a composite unit 14.
Referring to fig. 2, the above-described dry electrode production method includes the steps of:
and S110, respectively carrying out grading treatment on the preset active material and the conductive agent by using a mixing set, and sequentially carrying out drying treatment and mixing treatment on the raw materials to obtain an initial mixed material. The raw materials consist of preset active materials, conductive agents and binders, wherein the preset active materials, the conductive agents and the binders are reserved after grading treatment, and the molecular weights of the binders are larger than a first preset threshold value. It should be noted that, in the present application, the binder is a powdered resin, and is not in the form of particles or emulsion, which facilitates the formation of the subsequent molecular orientation network structure, facilitates the control of the degree of molecular orientation, and thus facilitates the guarantee of the production quality of the electrode. Illustratively, the predetermined active material may include lithium nickel cobalt manganese oxide.
For example, when implemented, the drying operation may be to perform dehydration on the predetermined active material and the conductive agent, respectively. Such as vacuum baking at 120 c for 2 hours for a predetermined active material. The conductive agent is baked in vacuum at 200 ℃ for 2 hours.
In this embodiment, the mixing unit includes a first mixing unit and a second mixing unit. The step S110 includes:
the first mixing unit mixes the preset active material reserved after the grading treatment and the conductive agent reserved after the grading treatment to obtain a first mixed material.
And the second mixing unit mixes the first mixed material and the binder to obtain an initial mixed material.
That is, the preset active material and the conductive agent are slowly stirred and mixed, and then the binder powder is added for mixing, so that the mixing treatment quality of the mixed powder is favorably ensured, and the production quality of the electrode is favorably ensured. The dried material is a dry material.
In this embodiment, the binder is a fluorine-based polymer, including but not limited to PTFE, FEP, PFA, PVDF, and PFPA. In a preferred embodiment, the binder is a PTFE resin, i.e., a polytetrafluoroethylene resin. The adhesive can facilitate the subsequent control of the molecular orientation degree of the adhesive, thereby facilitating the control of the production quality of the electrode. For example, the first preset threshold may be 400 ten thousand, which is not limited in this application.
In a preferred embodiment, the molecular weight of the fluoropolymer binder is 400 to 1200 ten thousand; the tensile strength is 22-31 Mpa; the elongation at break is 285% -310%; and the bulk density is 380 to 490 g/L. The present application is not limited thereto.
And S120, performing molecular orientation treatment on the initial mixed material by using a molecular orientation unit to obtain a target mixed material. In practice, the above objects are achievedThe mixed material is flocculent material. In the step, the molecular orientation unit utilizes supersonic airflow to carry out shearing and dispersing treatment on the mixed material to obtain a target mixed material. Wherein the feeding speed of the initial mixed material ranges from 1 liter/hour to 200 liters/hour, the air pressure of the supersonic airflow ranges from 0.5MPa to 1.2MPa, and the flow speed of the supersonic airflow ranges from 1m to 45m 3 And/min. The control to feed rate, the control of air pressure and/or the control of air flow rate, that this application above-mentioned all are favorable to controlling the molecular orientation degree of material in a suitable interval to do benefit to the electrode production quality who guarantees lithium ion battery.
In specific implementation, the molecular orientation unit can comprise an air source module, a charging module, a crushing module, a product grading module, a product collecting module and an air source circulation module. Clean compressed air or nitrogen with pressure and flow in a preset interval provided by the air source module and flocculent materials provided by the feeding module are mixed in the crushing module to form gas-solid two-phase flow, and supersonic airflow generated by the nozzle exerts physical effects of strong shearing force, friction force, high-frequency vibration and the like on the flocculent materials to obtain uniform mixed powder. Then the particles reaching the preset fineness are separated from the crushing chamber by the product grading module, and the separated particles are collected and packaged by the product collecting module.
In other examples, when this step is carried out, the molecular orientation treatment may be carried out on the initial mixture by using an intensive mixer or kneader. This is not limited by the present application.
And S130, performing hot-press forming treatment on the target mixed material by using a heating roller by using a hot-press forming unit to form an electrode film.
In specific implementation, because the heating rollers are made of metal materials, the deformation degree generated by expansion after heating is uneven, and the uneven deformation can influence the precision of products manufactured after rolling. Therefore, the heating roller is an electromagnetic induction heating roller in the application, and the roundness of the heating roller at the process temperature is less than or equal to a second preset threshold. The temperature distribution precision of the heating roller in the working width is a third preset threshold value. That is, the heating roller is a high-precision electromagnetic heating roller. Therefore, the high-precision electromagnetic heating roller can be used for heating, the temperature accuracy is guaranteed, the thermal deformation caused by temperature difference is avoided, and the electrode production quality is guaranteed.
Specifically, in the operation of the high-precision electromagnetic heating roller, the heating roller itself is first heated, and when the heating roller is heated to the operating temperature of the heating roller, a plurality of sets of parameters are measured on the heating roller, and the heating is stopped when the measured parameters are kept unchanged. The heated roll is then cooled and the cooled heated roll is mounted on the grinder rail using a bearing bracket. And then heating the heating roller again to the working temperature of the heating roller, and simultaneously cooling the bearing bracket and the grinding wheel on the grinding machine. The grinding machine drives the heating roller to rotate, the grinding wheel on the grinding machine grinds the surface of the heating roller, and the cooling assembly on the grinding wheel cools the grinding wheel. The grinding wheel is cooled during grinding, redundant heat can be taken away in time, and the roundness of the heating roller body at the process temperature is improved. The above-mentioned measurement parameters include, but are not limited to, the circular run out, cylindricity, and straightness of the heating roller.
Therefore, the heating roller is heated to the working temperature firstly, and deformation errors caused by microscopic unevenness of the roller body material of the heating roller are released. Then carrying out hot grinding to simulate the working state of the heating roller, and grinding the roller surface of the heating roller by using a grinding wheel until the roller surface meets a certain diameter requirement; during the grinding, the emery wheel produces the heat with the roll surface contact of warming mill, and local heat accumulation leads to the inhomogeneous deformation in surface of warming mill to influence the grinding precision, this application cools off to emery wheel and bearing bracket, can in time take away unnecessary heat, can guarantee like this that the warming mill also can reach within 0.005mm true circularity under the process temperature under the high temperature, can satisfy the user demand of various high precisions.
For example, the second preset threshold may be 0.005mm and the third preset threshold may be 1.0 ℃ at the process temperature. Namely, the roundness of the heating roller is not more than 0.005mm at the process temperature; the temperature distribution accuracy within the working width is ± 1.0 ℃. The present application is not limited thereto. The number and the arrangement mode of the heating rollers in the hot-press forming unit are not limited in the application.
In the implementation process of the step, an automatic quantitative powder conveying mechanism is used for quantitatively and continuously scattering the target mixed material to a heating roller to realize powder conveying. The heating roller is driven by the combination of a motor and a speed reducer to carry out transmission. Each group of heating rollers are independently driven, the speed is adjusted according to the production process requirement, and the heating rollers can run at the same speed or run at different speeds. Wedge blocks are arranged between the heating roller sets to adjust the gap between the two rollers, and displacement sensors are configured to feed back the distance information between the rollers to a control system and output the information to a display screen to facilitate reading, so that the gap between the two rollers in each set of heating rollers can be adjusted conveniently.
In this embodiment, the above-mentioned hot press forming unit may be partially constructed in the manner shown in fig. 3 or fig. 4. In fig. 3, the hot press molding machine set includes a hot press unit 31. And the hot press unit 31 comprises at least one set of heating rollers. Illustratively, two heated rollers 32 in each set of heated rollers are disposed in a horizontal arrangement. After the material conveyed by the powder conveying mechanism 33 enters the hot-pressing unit 31 for hot pressing, the material is wound by the winding mechanism 35 to obtain the electrode film 34. In fig. 4, the hot press molding machine set includes a hot press unit 31 and a reforming unit 41. And the hot press unit 31 and the shaping unit 41 each include at least one heating roller set. Illustratively, the two heating rollers 32 in each heating roller set in the hot press unit 31 are disposed in a horizontal arrangement. The two heating rolls 32 in each heating roll group in the reforming unit 41 are arranged in a vertical arrangement. After the material conveyed by the powder conveying mechanism 33 enters the hot pressing unit 31 for hot pressing, the material can be shaped by the shaping unit 41 and wound by the winding mechanism 35 to obtain a finished electrode film 34.
In other embodiments, the heating roller may also be heated by heat transfer oil or electric heating, which is not limited in the present application.
And S140, the compound unit utilizes the heating roller to press the electrode film and the current collector to obtain the electrode plate. Referring to fig. 5, the electrode film 34 and the current collector 52 are pressed using a composite set 51, and the current collector may be a metal foil. The compounding assembly 51 contains at least one set of heating rolls. Each heating roller group includes two heating rollers 53 distributed up and down. And compounding to obtain the finished electrode plate 54. It should be noted that the present application does not limit the number of heating roll groups in the compound unit 51. The working temperature of the heating roller in the compound unit 51 can be 50-260 ℃, and the working pressure can be 3-50 t. The present application is not limited thereto.
In another embodiment of the present application, on the basis of the embodiment corresponding to fig. 1 described above, as shown in fig. 6, step S110 is replaced with step S111: and sequentially drying the various raw materials, and mixing the dried materials obtained after drying treatment under the environmental condition lower than a first preset temperature to obtain an initial mixed material.
Step S150 is further included between step S110 and step S120: and carrying out heat preservation treatment on the initial mixed material under the environment condition of a second preset temperature. The second preset temperature is greater than the first preset temperature. That is, the temperature of the heat preservation treatment is higher than that of the low-temperature mixing process, and subsequent molecular orientation is facilitated through the heat preservation treatment, so that the production quality of the pole piece is improved.
For example, the first preset temperature may be 18 ℃ and the second preset temperature may be 50 ℃. The present application is not limited thereto. In specific implementation, the dry materials can be mixed at the temperature of 0-18 ℃. The initial mixed material can be subjected to heat preservation treatment at the temperature of 30-100 ℃, and the heat preservation time is 5-40 min. This is not limited by the present application.
In another embodiment of the present application, on the basis of the embodiment corresponding to fig. 1, the mixing unit includes a first classifying unit. As shown in fig. 7, step S110 is replaced with step S112: the first grading unit is used for grading the preset active material and the conductive agent respectively, then the mixing set is used for grading the preset active material and the conductive agent respectively, and the raw materials are sequentially dried and mixed to obtain an initial mixed material. That is, the predetermined active material and the conductive agent satisfying the predetermined fineness interval are retained to participate in the subsequent mixing step. The active material and the conductive agent are preset based on the particle size in the proper range selected through classification processing, the raw materials are uniformly mixed, the phase separation or the phase surrounding is avoided, the control of the orientation degree of molecules is facilitated, and the production quality of the electrode is guaranteed.
For example, the conductive agent can be selected to have a retention D50 value within the range of 5-50nm and a specific surface area of 100-700m 2 Within the/g interval. When LiCoO is adopted as the active material 2 In the case of cobalt lithium oxide, the retention D50 value is selected to be within the range of 4.00-20 um, and the specific surface area is 0.10-0.6 m 2 Within the/g interval. When the predetermined active material is NCM, the reserved D50 value is selected to be within 5.00-12 um, and the specific surface area is 0.2-0.8 m 2 Within the/g interval. When the predetermined active material is LiMn 2 O 4 When the specific surface area is 0.4-0.8 m, the reserved D50 value can be selected to be within 6.00-16 um 2 Within the/g interval.
In another embodiment of the present application, on the basis of the embodiment corresponding to fig. 1, the step S130 includes:
and carrying out hot-pressing treatment on the target mixed material by using a first heating roller and a second heating roller to obtain an initial polar film.
And shaping the initial electrode film by the second heating roller and the third heating roller to obtain an electrode film. Referring to fig. 8, the first heating roller 81, the second heating roller 82, and the third heating roller 83 form a triangular structure. That is, some heating rollers in the hot press unit 31 and the shaping unit 41 are shared. This is favorable to saving the space and the cost of hot briquetting machine group, just also is favorable to the miniaturized design of the dry process electrode apparatus for producing of this application. For example, the hot pressing temperature of the first heating roller and the second heating roller for hot pressing the target mixture may be 120 to 240 ℃. This is not limited by the present application. The shaping process may be, for example, adjusting the thickness and the compaction density of the initial electrode film.
In the present application, the initial electrode film may be directly used as a raw material input in step S140, and the current collector may be pressed together to manufacture an electrode sheet.
The first heating roller and the second heating roller have different rotational linear speeds, and the second heating roller and the third heating roller have the same rotational linear speed. Utilize two warming mill that the rotational speed is different to carry out the hot pressing like this, can produce a shearing force for the electrode film of roll-in is more even, thereby does benefit to the production quality who guarantees the electrode. In specific implementation, when the rotational linear speeds of the first heating roller and the second heating roller are different, the method can be divided into three cases: the corresponding rollers have the same diameter and different rotating speeds (for example, the rotating speed ratio is between 1:0.7 and 1: 1.5); the corresponding rollers have different diameters and same rotating speed; or the corresponding rollers have different diameters and different rotating speeds. When the rotating linear speeds of the second heating roller and the third heating roller are the same, the diameters and the rotating speeds of the corresponding rollers are the same.
In other embodiments, the rotational linear speeds of the first heating roller and the second heating roller may be set to be the same, and the present application is not limited thereto.
As shown in fig. 9, another embodiment of the present invention discloses a dry method electrode production method. The method comprises the following steps:
s910, respectively carrying out grading treatment on the preset active material and the conductive agent, and sequentially carrying out drying treatment and mixing treatment on the raw materials to obtain an initial mixed material. The raw materials consist of preset active materials, conductive agents and binders, wherein the preset active materials, the conductive agents and the binders are reserved after grading treatment, and the molecular weights of the binders are larger than a first preset threshold value.
And S920, performing molecular orientation treatment on the initial mixed material to obtain a target mixed material.
S930, performing a hot press molding process on the target mixture using a heating roller to form an electrode film. And
and S940, the electrode film and the current collector are pressed by the heating roller to obtain the electrode plate.
In summary, the dry electrode production method and the dry electrode production device provided by the invention have at least the following advantages:
the dry-method electrode production method and the device disclosed by the embodiment of the application adopt the dry-method material mixing and hot-rolling film forming modes to manufacture the required positive and negative electrode plates of the battery, have simple process and are beneficial to improving the production efficiency of the electrode plates; selecting a preset active material in a proper range based on classification treatment, so that the raw materials are uniformly mixed to avoid phase separation or phase surrounding; on the other hand, the screened adhesive can be fully oriented; and based on controlling each parameter of supersonic gas flow, the full orientation of the binder is facilitated, and the control of the molecular orientation degree is facilitated; thereby ensuring the production quality of the electrode plate of the lithium ion battery.
In the description of the present invention, it is to be understood that the terms "bottom", "longitudinal", "lateral", "upper", "lower", "front", "rear", "vertical", "horizontal", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are used only for convenience in describing the present invention and for simplification of description, and do not indicate or imply that the structures or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, are not to be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more and "several" means one or more unless otherwise specified.
In the description herein, references to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," etc., indicate that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (15)
1. A dry electrode production method, comprising the steps of:
s110, respectively carrying out grading treatment on a preset active material and a conductive agent, and sequentially carrying out drying treatment and mixing treatment on the raw materials to obtain an initial mixed material; the raw materials consist of preset active materials, conductive agents and binders with molecular weight larger than a first preset threshold value, wherein the preset active materials, the conductive agents and the binders are reserved after grading treatment;
s120, performing molecular orientation treatment on the initial mixed material to obtain a target mixed material;
s130, carrying out hot-press molding treatment on the target mixed material by using a heating roller to form an electrode film; and
and S140, pressing the electrode film and the current collector by using the heating roller to obtain the electrode sheet.
2. The dry electrode production method according to claim 1, wherein step S110 comprises:
and mixing the dried materials obtained after the drying treatment under the environmental condition of being lower than the first preset temperature to obtain initial mixed materials.
3. The dry electrode production method according to claim 1, further comprising, between step S110 and step S120, the steps of:
carrying out heat preservation treatment on the initial mixed material under the environment condition of a second preset temperature; the second preset temperature is greater than the first preset temperature.
4. The dry electrode production method according to claim 1, wherein step S110 comprises:
mixing the preset active material and the conductive agent to obtain a first mixed material;
and mixing the first mixed material and the binder to obtain an initial mixed material.
5. The dry electrode production method according to claim 1, wherein the heated roller is an electromagnetic induction heated roller, and the roundness of the heated roller at the process temperature is less than or equal to a second preset threshold value; and the temperature distribution precision of the heating roller in the working width is a third preset threshold value.
6. The dry electrode production method according to claim 1, wherein step S130 comprises:
carrying out hot-pressing treatment on the target mixed material by using a first heating roller and a second heating roller to obtain an initial polar film;
shaping the initial pole film by using the second heating roller and the third heating roller to obtain an electrode film; the first heating roller, the second heating roller, and the third heating roller form a triangular structure.
7. The dry electrode production process of claim 6, wherein the first heated roller and the second heated roller have different linear speeds of rotation, and the second heated roller and the third heated roller have the same linear speed of rotation.
8. The dry electrode production method of claim 1, wherein step S120 comprises:
carrying out shearing and dispersing treatment on the initial mixed material by using supersonic airflow to obtain a target mixed material; wherein the feeding speed of the initial mixed material ranges from 1 liter/hour to 200 liters/hour, the pressure of the supersonic airflow ranges from 0.5MPa to 1.2MPa, and the flow speed of the supersonic airflow ranges from 1m to 45m 3 /min。
9. The dry electrode production process according to claim 1, wherein the binder is a fluoropolymer.
10. A dry electrode production device for carrying out the dry electrode production method according to claim 1, comprising:
the mixing unit is used for carrying out grading treatment on a preset active material and a conductive agent respectively, and drying treatment and mixing treatment are carried out on the raw materials in sequence to obtain an initial mixed material; the raw materials consist of preset active materials, conductive agents and binders with molecular weight larger than a first preset threshold value, wherein the preset active materials, the conductive agents and the binders are reserved after grading treatment;
the molecular orientation unit is used for performing molecular orientation treatment on the initial mixed material to obtain a target mixed material;
the hot-press forming unit is used for carrying out hot-press forming treatment on the target mixed material by using a heating roller to form an electrode film; and
and the compound unit is used for pressing the electrode film and the current collector by using the heating roller to obtain the electrode plate.
11. The dry electrode production apparatus according to claim 10, wherein the mixing assembly comprises a first classification unit, a first mixing unit and a second mixing unit; the first grading unit is used for grading preset active materials and conductive agents respectively; the first mixing unit is used for mixing the preset active material and the conductive agent which are reserved after grading treatment to obtain a first mixed material; the second mixing unit is used for mixing the first mixed material and the binder to obtain an initial mixed material.
12. The dry electrode production apparatus according to claim 10, wherein the heated roller is an electromagnetic induction heated roller, and the roundness of the heated roller at the process temperature is equal to or less than a second preset threshold value; and the temperature distribution precision of the heating roller in the working width is a third preset threshold value.
13. The dry electrode production apparatus according to claim 10, wherein the hot press molding machine set comprises a first heating roller, a second heating roller and a third heating roller which are distributed in a triangular structure;
the first heating roller and the second heating roller carry out hot-pressing treatment on the target mixed material to obtain an initial polar film;
and the second heating roller and the third heating roller are used for shaping the initial electrode film to obtain an electrode film.
14. The dry electrode production apparatus according to claim 13, wherein the first heated roller and the second heated roller have different rotational linear velocities, and the second heated roller and the third heated roller have the same rotational linear velocity.
15. The dry electrode production device according to claim 10, wherein the molecular orientation unit performs a shear dispersion process on the initial mixture by using a supersonic gas flow to obtain a target mixture; wherein the feeding speed of the initial mixed material ranges from 1 liter/hour to 200 liters/hour, the pressure of the supersonic airflow ranges from 0.5MPa to 1.2MPa, and the flow speed of the supersonic airflow ranges from 1m 3 /min～45m 3 /min。
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