CN115148947A - Production system and production method for dry coating pressed pole piece - Google Patents
Production system and production method for dry coating pressed pole piece Download PDFInfo
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- CN115148947A CN115148947A CN202210945419.9A CN202210945419A CN115148947A CN 115148947 A CN115148947 A CN 115148947A CN 202210945419 A CN202210945419 A CN 202210945419A CN 115148947 A CN115148947 A CN 115148947A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/04—Sorting according to size
- B07C5/12—Sorting according to size characterised by the application to particular articles, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/18—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using profiled rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B3/00—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
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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
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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
- H01M4/0402—Methods of deposition of the material
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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
- H01M4/0433—Molding
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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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a production system and a production method for pressing a pole piece by a dry coating. The dry powder calendering and film forming mechanism and the pole piece pressing and forming mechanism are arranged in the dry coating pressing and film forming system, wherein the dry powder calendering and film forming mechanism can perform calendering and forming on electrode dry powder coating to form an electrode film, and the electrode film formed by calendering can be pressed on a current collector through the pole piece pressing and forming mechanism to form a pole piece, so that a drying oven with a large length in the traditional pole piece production is abandoned, the equipment length and the floor area are greatly shortened, and energy conservation and emission reduction are realized. The pole piece produced by pressing based on the dry coating pressing pole piece production system has the advantages of firmness, difficulty in layering, high energy density and the like; in addition, the electrode dry powder coating dropped in the rolling film forming process can be recycled. The production method of the pole piece by dry coating pressing can realize the dry coating pressing production of the pole piece, and has the advantages of low production energy consumption, firm and difficult layering of the produced pole piece, high energy density and the like.
Description
Technical Field
The invention relates to the technical field of lithium battery pole piece production, in particular to a production system and a production method for pressing a pole piece by a dry coating.
Background
The traditional production mode of the lithium battery pole piece is mainly coating production, and the specific coating production process comprises multiple processes of slurry mixing, coating, drying, rolling and the like, so that the process is complex, and the defects of high energy consumption, high production cost, low production yield and the like are overcome.
In the operation process of the coating production process, the current collector of the pole piece is continuously unreeled for feeding, and the drying oven required for drying is long in length, large in occupied area, high in energy loss, large in waste discharge and large in environmental pollution. In slurry coating, excessive slurry after coating is generally discharged as waste materials and cannot be recycled, so that the production cost is high. In addition, the active substance coated by the slurry is easy to be layered with a conductive agent, a binder and the like, so that the components are unevenly distributed in the dried pole piece adhesive material, and the flexibility of the pole piece is influenced.
Disclosure of Invention
The invention aims to solve the problems of high energy consumption, large pollution, slurry waste, low yield rate of pole piece production and the like in the coating production of the conventional lithium battery pole piece, and provides a production method for pressing the pole piece by using a dry coating.
The invention also aims to provide a production system for pressing the pole piece by the dry coating.
The purpose of the invention is realized by the following technical scheme.
A dry coating pressed pole piece production system comprises a first dry powder calendering film-forming mechanism, a second dry powder calendering film-forming mechanism and a pole piece pressing forming mechanism;
the first dry powder rolling film-forming mechanism and the second dry powder rolling film-forming mechanism can respectively carry out rolling forming on the positive electrode film and the negative electrode film; the pole piece pressing and forming mechanism can press the current collector, the positive electrode film and the negative electrode film into the pole piece.
In a preferred embodiment, the first dry powder calendering film-forming mechanism comprises a first calendering roller group and a first dry powder feeding system; the first calendering roller group comprises a first calendering roller pair, and the first dry powder feeding system comprises a first dry powder hopper; the discharge hole of the first dry powder hopper corresponds to the space between the first calendering rollers and can be used for blanking the dry powder material contained in the first dry powder hopper to the gap between the first calendering rollers;
and/or the second dry powder calendering film-forming mechanism comprises a second calendering roller group and a second dry powder feeding system; the second calendering roller group comprises a second calendering roller, and the second dry powder feeding system comprises a second dry powder hopper; and a discharge port of the second dry powder hopper corresponds to the space between the second calendering rollers and can discharge the dry powder material loaded into the space between the second calendering rollers.
In a further preferred embodiment, a first aggregate container is respectively arranged below the first calendering pair roller; and/or a second aggregate container is arranged below the second calendering roller.
In a preferred embodiment, a corona treatment mechanism is arranged on the feeding side of the pole piece press forming mechanism; corona treatment mechanism includes front corona roller and back corona roller, the feeding the mass flow body can openly hug closely respectively front corona roller and back are hugged closely back corona roller has gone on the roller, and by front corona roller with back corona roller is right respectively the front and the back of the mass flow body carry out corona treatment.
In a preferred embodiment, a current collector preheating mechanism is arranged on the feeding side of the pole piece compression molding mechanism; the current collector preheating mechanism comprises a preheating roller, and the fed current collector can pass through the preheating roller and is heated by the preheating roller.
In a preferred embodiment, a first electrode film trimming mechanism is arranged between the pole piece compression molding mechanism and the first dry powder rolling and film forming mechanism, and comprises an upper cutter and a lower cutter which are arranged in a matching manner;
and/or a second electrode film trimming mechanism is arranged between the pole piece pressing and forming mechanism and the second dry powder calendering and film forming mechanism, and comprises an upper cutter and a lower cutter which are arranged in a matched mode.
In a preferred embodiment, a positive electrode film guide roller, a current collector guide roller and a negative electrode film guide roller are arranged on the feeding side of the pole piece compression molding mechanism, and can respectively guide a positive electrode film, a current collector and a negative electrode film in order to enter the pole piece compression molding mechanism.
In a preferred embodiment, the pole piece press forming mechanism comprises a pair of rollers which are arranged in a matching way.
In a preferred embodiment, a pole piece cooling mechanism is arranged on the discharge side of the pole piece compression molding mechanism; the pole piece cooling mechanism comprises a cooling roller, and the pressed and formed pole piece can pass through the cooling roller and is cooled by the cooling roller.
In a preferred embodiment, a thickness measuring mechanism is arranged on the discharging side of the pole piece compression molding mechanism, the thickness measuring mechanism comprises a thickness gauge, and a thickness measuring feeding supporting roller and a thickness measuring discharging supporting roller are respectively arranged on the feeding side and the discharging side of the thickness gauge;
and/or, the discharge side of the pole piece compression molding mechanism is provided with a CCD detection mechanism, the CCD detection mechanism comprises a front detection supporting roller and a back detection supporting roller, and the pole piece subjected to compression molding can be respectively and positively clung to the front detection supporting roller and the back detection supporting roller to be clung to the back detection supporting roller to pass through the roller.
In a further preferred embodiment, the CCD detection mechanism further comprises a detection marking roller, and the detection marking roller is close to the discharge side of the CCD detection mechanism.
In a preferred embodiment, the system for producing a dry coating pressing pole piece is provided with a current collector unwinding mechanism, wherein the current collector unwinding mechanism comprises an unwinding shaft and can unwind a current collector coil; and/or a pole piece winding mechanism is arranged, and the pole piece winding mechanism comprises a winding shaft and can wind the pole piece synthesized by pressing.
In a further preferred embodiment, an unreeling tape splicing platform is arranged on the discharge side of the current collector unreeling mechanism; and/or a rolling belt receiving platform is arranged on the feeding side of the pole piece rolling mechanism.
A method for producing a dry coating pressed pole piece comprises the following steps:
s1, carrying out corona and preheating treatment on a current collector to obtain a pretreated current collector;
s2, heating and rolling the positive conductive dry powder to obtain a positive electrode film; heating and rolling the negative electrode conductive dry powder to obtain a negative electrode film;
s3, stacking the pretreated current collector between the positive electrode film and the negative electrode film, and rolling to combine and mold the positive electrode film, the negative electrode film and the pretreated current collector;
and S4, cooling to obtain the dry coating pressed pole piece.
In a preferred embodiment, before the roll forming of the positive electrode film and the negative electrode film, trimming is performed.
In a preferred embodiment, in S1, the corona treatment may remove stains and oxide layers from the surface of the current collector.
In a preferred embodiment, in S1, the temperature of the preheating treatment is greater than 120 ℃.
In a preferred embodiment, in S2, the temperature of the heated calendering is 120 ℃ to 150 ℃.
In a preferred embodiment, in S3, the rolling pressure is >150kN and the maximum linear load is 600-1500N/mm.
In a preferred embodiment, in S4, the cooling is to less than 40 ℃.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the dry coating pressing pole piece production system is provided with the dry powder rolling film-forming mechanism and the pole piece pressing forming mechanism, wherein the dry powder rolling film-forming mechanism can roll and form an electrode film by electrode dry powder coating, and the rolled and formed electrode film can be pressed on a current collector through the pole piece pressing forming mechanism to form a pole piece, so that the dry coating pressing production of the pole piece can be realized, a large-length oven in the traditional pole piece production is abandoned, the equipment length and the floor area are greatly shortened, the energy is saved, the emission is reduced, and the environmental pollution is reduced.
Moreover, the pole piece produced by pressing based on the dry coating pressing pole piece production system has the advantages of firmness, difficulty in layering, high energy density and the like. In addition, the dry powder calendering and film forming mechanism is provided with the collecting container, so that the electrode dry powder coating falling in the calendering and film forming process can be recycled, the high-efficiency utilization of the electrode dry powder coating is realized, the waste is reduced, and the production cost is saved.
The production method of the pole piece by dry coating pressing can realize the dry coating pressing production of the pole piece, has low production energy consumption, and the produced pole piece has the advantages of firmness, difficult layering, high energy density and the like, and effectively ensures the production quality of the battery pole piece.
Drawings
FIG. 1 is a schematic structural diagram of a dry coating pressing pole piece production system according to the present invention in a specific embodiment;
FIG. 2 is a schematic diagram of the production of a dry coating pressed pole piece;
FIG. 3 is a schematic structural view of a thickness measuring mechanism;
FIG. 4 is a schematic diagram of the dry coating pressing pole piece manufacturing system in the second embodiment;
FIG. 5 is a process flow diagram of the dry coating pressing pole piece production method of the present invention in a specific embodiment;
the attached drawings are marked as follows: 1-current collector unwinding mechanism, 101-winding shaft, 2-unwinding belt connecting platform, 3-corona treatment mechanism, 301-front corona roller, 302-back corona roller, 4-current collector preheating mechanism, 401-preheating roller, 5-first dry powder calendering film-forming mechanism, 501-first calendering roller, 502-first dry powder hopper, 6-first electrode film trimming mechanism, 601-first knife roller, 7-second dry powder calendering film-forming mechanism, 701-second calendering roller, 702-second dry powder hopper, 703-first collecting container, 704-first collecting container, 8-second electrode film trimming mechanism, 801-second knife roller, 9-positive electrode film guide roller, 10-current collector guide roller, 11-current collector film guide roller, 12-pole piece negative electrode pressing and forming mechanism, 121-upper roller, 122-lower roller, 13-pole piece cooling mechanism, 131-cooling roller, 14-thickness measuring mechanism, 141-thickness measuring instrument, 142-thickness measuring feeding roller, 143-thickness measuring roller, 15-winding shaft, 15-winding belt connecting platform, 153-detection platform, 17-detection platform, and detection platform.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to specific examples and drawings, but the scope and implementation of the present invention are not limited thereto.
In the description of the specific embodiments, it should be noted that the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships where products of the invention are usually placed when the products of the invention are used, and the terms "first", "second", and the like are used for convenience of distinction and are only used for convenience of description and simplification of description, but do not indicate or imply that structures or elements to be referred must have specific orientations, be constructed in specific orientations, and be operated, and therefore, are not to be construed as limiting the invention, and are not to indicate or imply relative importance.
Unless expressly stated or limited otherwise, the terms "mounted," "disposed," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. Additionally, where the term "and/or" is used, all references herein are to the inclusion of any and all combinations of one or more of the associated listed items.
Example one
Referring to fig. 1, the system for producing a dry coating pressed pole piece of the present invention includes a current collector unwinding mechanism 1, a first dry powder rolling film-forming mechanism 5, a second dry powder rolling film-forming mechanism 7, and a pole piece pressing and forming mechanism 12.
The current collector unreeling mechanism 1 comprises an unreeling shaft 101, and can unreel a current collector coil stock; the first dry powder rolling film forming mechanism 5 and the second dry powder rolling film forming mechanism 5 can respectively perform rolling forming on the positive electrode film 20 and the negative electrode film 21. Referring to fig. 2, the unreeled current collector 19 and the rolled positive electrode film 20 and negative electrode film 21 may enter the electrode sheet press-forming mechanism 12 through rollers, and the positive electrode film 20 and negative electrode film 21 are pressed by the electrode sheet press-forming mechanism 12 to be firmly attached to the current collector 19 to form the electrode sheet 22.
In the preferred embodiment, the pole piece press forming mechanism 12 includes a pair of rollers cooperatively disposed, and specifically includes an upper roller 121 and a lower roller 122 disposed opposite to each other and movable toward each other. When the pole piece 22 is pressed, the positive electrode film 20, the current collector 19 and the negative electrode film 21 are sequentially stacked and enter a gap between the upper roller 121 and the lower roller 122, and the upper roller 121 and the lower roller 122 are close to each other to roll and combine the positive electrode film 20, the current collector 19 and the negative electrode film 21, so that the pole piece 22 is formed.
In a preferred embodiment, a corona treatment mechanism 3 and a current collector preheating mechanism 4 are arranged between the discharge side of the current collector unreeling mechanism 1 and the feed side of the pole piece press forming mechanism 12. Optionally, the corona treatment mechanism 3 and the current collector preheating mechanism 4 are sequentially arranged along the unwinding direction of the current collector 19, and may sequentially perform corona treatment and preheating treatment on the unwound current collector 19.
Specifically, corona treatment mechanism 3 includes front corona roller 301 and back corona roller 302, and front corona roller 301 and back corona roller 302 specifically set gradually along current collector 19 unreel the advancing direction, and the current collector 19 of unreeling can be respectively through front corona roller 301 and back corona roller 302 the roller. And through setting, current collector 19 is hugged closely for the front when rolling from front corona roller 301 and is passed the roller in front corona roller 301, and is hugged closely back corona roller 302 and is passed the roller for the back when rolling from back corona roller 302, carries out corona treatment to current collector 19's front and back respectively by front corona roller 301 and back corona roller 302 to get rid of oxidation layer and greasy dirt on current collector 19 surface.
Further, guide rollers 18 are respectively disposed on the feeding side of the front corona roller 301 and the discharging side of the back corona roller 302, so as to perform feeding guide and discharging guide of the corona treatment on the unreeled current collector 19.
The current collector preheating mechanism 4 includes a preheating roller 401, the unreeled current collector 19 can be rolled by the preheating roller 401, and the current collector 19 can be heated by the preheating roller 401 when being rolled from the preheating roller 401, so as to perform preheating before pressing. Further, guide rollers 18 are disposed on both the feeding side and the discharging side of the preheating roller 401 to perform feeding guide and discharging guide of the preheating treatment on the unreeled current collector 19.
In addition, optionally, a plurality of guide rollers 18 are further disposed between the corona treatment mechanism 3 and the current collector preheating mechanism 4, so that unwinding of the current collector 19 between the corona treatment mechanism 3 and the current collector preheating mechanism 4 can be guided.
In some optional embodiments, an unwinding splicing tape platform 2 is arranged on the discharging side of the current collector unwinding mechanism 1. Specifically, optionally, the unwinding splicing tape platform 2 is arranged between the discharging side of the current collector unwinding mechanism 1 and the feeding side of the corona treatment mechanism 3. When the coil of the current collector 19 is changed in the production process, the coil changing and the tape splicing can be realized on the unwinding and tape splicing platform 2 in real time, so that the production is ensured to be smooth, and the production efficiency is improved.
In a preferred embodiment, referring again to fig. 1, the first dry powder calender film-forming mechanism 5 includes a first calender roll group and a first dry powder feed system. The first calendering roller group comprises a first calendering roller pair 501, two calendering rollers of the first calendering roller pair 501 can move close to each other for rolling, and the first dry powder feeding system comprises a first dry powder hopper 502; and the discharge port of the first dry powder hopper 502 corresponds to the space between the two calendering rollers of the first calendering roller pair 501, and can discharge the dry powder material loaded into the gap between the two calendering rollers of the first calendering roller pair 501. When the positive electrode film 20 is rolled, the positive conductive dry powder added to the first dry powder hopper 502 is continuously dropped into the gap between the two rolling rollers of the first rolling pair roller 501, and the two rolling rollers of the first rolling pair roller 501 rotate in a reverse differential manner, so that the positive conductive dry powder is continuously rolled into the positive electrode film 20 and continuously fed to the pole piece press-forming mechanism 12.
And the second dry powder calendering and film forming mechanism 7 comprises a second calendering roller group and a second dry powder feeding system. The second calender roll group comprises a second calender roll 701, similarly, two calender rolls of the second calender roll 701 can move close to each other for rolling, and the second dry powder feeding system comprises a second dry powder hopper 702; similarly, the discharge port of the second dry powder hopper 702 corresponds to the gap between the two calendering rollers of the second calendering roller pair 701, and can discharge the dry powder material loaded into the gap between the two calendering rollers of the second calendering roller pair 701. During the rolling of the negative electrode film 21, similarly, the negative conductive dry powder added to the second dry powder hopper 702 is continuously dropped into the gap between the two rolling rollers of the second rolling pair roller 701, and the two rolling rollers of the second rolling pair roller 701 rotate in the opposite differential directions, so that the negative conductive dry powder is continuously rolled into the negative electrode film 21 and continuously fed to the pole piece press-forming mechanism 12.
Further, a first electrode film trimming mechanism 6 is arranged between the pole piece press-forming mechanism 12 and the first dry powder rolling film-forming mechanism 5, and a second electrode film trimming mechanism 8 is arranged between the pole piece press-forming mechanism 12 and the second dry powder rolling film-forming mechanism 7.
The first electrode film trimming mechanism 6 comprises an upper cutter shaft and a lower cutter shaft which are arranged oppositely up and down, and an upper cutter and a lower cutter which are arranged in a matched manner are respectively arranged on the upper cutter shaft and the lower cutter shaft. Similarly, the second electrode film edge cutting mechanism 8 includes an upper cutter shaft and a lower cutter shaft which are oppositely arranged up and down, and an upper cutter and a lower cutter which are arranged in a matching manner are respectively arranged on the upper cutter shaft and the lower cutter shaft.
When the dry coating pressing production of the pole piece 22 is performed, please refer to fig. 2 again, the electrode film edges formed by the calendering film forming machine of the conductive dry powder are irregular, the irregular edges at both sides of the corresponding positive electrode film 20 and the negative electrode film 21 are respectively cut off by the first electrode film trimming mechanism 6 and the second electrode film trimming mechanism 8 before entering the pole piece pressing forming mechanism 12, and the rest parts are electrode films with the same edges, so that the pole piece 22 produced by pressing is a pole piece with complete same edges, thereby avoiding the bad conditions of short circuit and the like caused by the irregular edges, and ensuring the production quality of the pole piece 22.
In addition, in some alternative embodiments, the feed side and the discharge side of the first electrode film edge-cutting mechanism 6 are provided with a first knife feed roller 601 and a first knife discharge roller, respectively. Similarly, the feed side and the discharge side of the second electrode film edge cutting mechanism 8 are provided with a second knife feed roller 801 and a second knife discharge roller, respectively. Thereby, the feeding guide and the discharging guide of the corresponding trimming discharging can be performed for the corresponding electrode film.
In a preferred embodiment, referring to fig. 1 again, a positive electrode film guide roller 9, a current collector guide roller 10 and a negative electrode film guide roller 11 are disposed on the feeding side of the pole piece pressing mechanism 12. Specifically, the positive electrode film guide roller 9 is arranged between the discharge side of the first electrode film trimming mechanism 6 and the feed side of the pole piece press forming mechanism 12, the current collector guide roller 10 is arranged between the discharge side of the current collector preheating mechanism 4 and the feed side of the pole piece press forming mechanism 12, and the negative electrode film guide roller 11 is arranged between the discharge side of the second electrode film trimming mechanism 8 and the feed side of the pole piece press forming mechanism 12, so that the positive electrode film 20, the current collector 19 and the negative electrode film 21 can be respectively and orderly guided to enter the pole piece press forming mechanism 12.
Based on the combined structure of the positive electrode film 20 and the negative electrode film 21 on the front and back surfaces of the current collector 19, the feeding state of the positive electrode film 20, the negative electrode film 21 and the current collector 19 when entering the pole piece compression molding mechanism 12 is that the positive electrode film 20 and the negative electrode film 21 are distributed and stacked on the front and back surfaces of the current collector 19, specifically, the positive electrode film 20, the current collector 19 and the negative electrode film 21 are stacked in sequence from top to bottom, or the positive electrode film 20, the current collector 19 and the negative electrode film 21 are stacked in sequence from bottom to top.
Accordingly, the positive electrode film guide roller 9 and the negative electrode film guide roller 11 are disposed at both sides of the current collector guide roller 10, such as the positive electrode film guide roller 9 and the negative electrode film guide roller 11 disposed at upper and lower sides of the current collector guide roller 10, or the positive electrode film guide roller 9 and the negative electrode film guide roller 11 disposed at lower and upper sides of the current collector guide roller 10. Further, the first electrode film trimming mechanism 6, the second electrode film trimming mechanism 8 and the current collector preheating mechanism 4 can form a distribution state corresponding to the positive electrode film guide roller 9, the current collector guide roller 10 and the negative electrode film guide roller 11, for example, the first electrode film trimming mechanism 6 and the second electrode film trimming mechanism 8 are distributed on the upper side and the lower side of the current collector preheating mechanism 4, or the first electrode film trimming mechanism 6 and the second electrode film trimming mechanism 8 are distributed on the current collector preheating mechanism 4.
In a preferred embodiment, referring to fig. 1 again, a pole piece cooling mechanism 13 is disposed on the discharge side of the pole piece compression molding mechanism 12, and can cool the compression-molded pole piece 22. Specifically, the pole piece cooling mechanism 13 includes a cooling roller 131, the pressed pole piece 22 can be rolled by the cooling roller 131, and the pole piece 22 can be cooled by the cooling roller 131 when being rolled from the cooling roller 131. Further, a guide roller 18 is arranged between the discharge side of the pole piece compression molding mechanism 12 and the cooling roller 131 to guide the discharge and cooling feeding of the pressed pole piece 22.
In a preferred embodiment, please refer to fig. 1 again, the system for producing dry coating pressed pole pieces of the present invention further comprises a pole piece winding mechanism 17. The pole piece winding mechanism 17 includes a winding shaft 171, the winding shaft 171 can be selected but not limited to a slip shaft, and the pole piece 22 can be wound by pressing to facilitate blanking and transferring.
In some optional embodiments, the feeding side of the pole piece winding mechanism 17 is provided with a winding and splicing platform 16. When the winding and the roll changing of the pole piece 22 are carried out in the production process, the roll changing and the tape splicing can be realized on the winding and tape splicing platform 16 in real time, the smooth production is ensured, and the production efficiency is improved.
In another preferred embodiment, please refer to fig. 1 again, a thickness measuring mechanism 14 and a CCD detecting mechanism 15 are disposed between the pole piece compression-molding mechanism 12 and the feeding side of the pole piece winding mechanism 17, specifically, the thickness measuring mechanism 14 and the CCD detecting mechanism 15 are sequentially disposed between the discharging side of the pole piece compression-molding mechanism 12 and the feeding side of the winding-receiving platform 16 along the winding-advancing direction of the pole piece 22, so that the pole piece 22 can be sequentially subjected to thickness detection and visual defect detection before the pole piece 22 is wound, so as to monitor the quality of the produced pole piece 22, and further ensure the quality of the produced pole piece 22.
Specifically, as shown in fig. 3, the thickness measuring mechanism 14 includes a thickness measuring instrument 141, and a thickness measuring feeding support roller 142 and a thickness measuring discharging support roller 143, which are respectively disposed on the feeding side and the discharging side of the thickness measuring instrument 141. The thickness gauge 141 comprises a thickness measuring generator and a receiver, and the pole piece 22 can be supported by the thickness measuring feeding support roller 142 and the thickness measuring discharging support roller 143, so that the pole piece 22 can pass through a gap between the thickness measuring generator and the receiver of the thickness gauge 141, and the thickness gauge 141 can perform online thickness testing on the pole piece 22.
Further, the guide rollers 18 are arranged on the feeding side of the thickness measuring feeding support roller 142 and the discharging side of the thickness measuring discharging support roller 143, and can respectively perform feeding guide and discharging guide on the pole piece 22 for thickness test.
The CCD detecting mechanism 15 includes a front detection supporting roller 151 and a back detection supporting roller 152, and CCD detecting cameras may be respectively disposed outside the front detection supporting roller 151 and the back detection supporting roller 152. Optionally, the front side detecting support roller 151 and the back side detecting support roller 152 are sequentially disposed along the winding advancing direction of the pole piece 22, and the advancing pole piece 22 can be respectively subjected to roll support by the front side detecting support roller 151 and the back side detecting support roller 152. And through setting, pole piece 22 passes through the front side detects the backup roll 151 and passes the roller for the front side clings to the front side and detects the backup roll 151 and passes the roller for the back side clings to the back side and detects the backup roll 152 and passes the roller for the back side when detecting the backup roll 152 from the back side, and pass the roller and detect the back and the front side of the pole piece 22 to carry out visual detection respectively by corresponding CCD detection camera to detect whether the surface of the pole piece 22 has defects.
Further, a guide roller 18 is provided on the discharge side of the CCD detection mechanism 15 to guide the CCD detection discharge.
In addition, a CCD marking roller 153 is further disposed on the discharge side of the CCD detection mechanism 15, and a marking machine is correspondingly disposed on the CCD marking roller 153. After the pole piece 22 is detected by the CCD detection camera of the CCD detection mechanism 15, the pole piece passes through the CCD marking roller 153, and the corresponding marking machine can mark the pole piece 22 passing through the roller so as to mark defective products.
Moreover, the thickness gauge 141 in the thickness measuring mechanism 14 can realize feedback control connection with the roller driving member of the pole piece press forming mechanism 12 through the controller, and a closed-loop control system is formed by the thickness gauge 141, the controller and the roller driving member. After the controller receives the thickness measuring information fed back by the thickness gauge 141, the controller can process the information and send a control instruction to control the action of the roller driving part so as to adjust the pressed thickness.
Example two
Similar to the first embodiment, referring to fig. 4, in the system for producing a dry coating pressed pole piece of the present embodiment, a first aggregate container 703 is correspondingly disposed below the first calendering pair roller 501. When the positive electrode film 20 is rolled, the first collecting container can recover the positive conductive dry powder falling in the rolling film forming process.
Similarly, a second aggregate container 704 is disposed below the second calender roll 701. When the negative electrode film 21 is rolled, the negative conductive dry powder falling off in the rolling film forming process can be recovered by the second collection container.
Therefore, the high-efficiency utilization of the conductive dry powder is realized, the waste of the conductive dry powder is reduced, and the production cost is saved.
EXAMPLE III
The production method of the dry coating pressed pole piece of the invention has the process flow shown in fig. 5 (the corresponding flow is carried out according to the direction of an arrow), and adopts the production system of the dry coating pressed pole piece of the first embodiment to carry out preparation, and comprises the following steps:
s1, unwinding and unfolding a current collector coil material by a current collector unwinding mechanism 1, wherein the current collector is a foil material (specifically comprising a positive electrode, an aluminum foil and a negative electrode, and a copper foil); carrying out corona treatment on the unreeled current collector by a corona treatment mechanism 3 to remove stains and an oxidation layer on the surface of the current collector; preheating the unreeled current collector by a current collector preheating mechanism 4, wherein the preheating temperature is higher than 120 ℃; then the mixture is guided by a current collector guide roller 10 and is conveyed into a pole piece pressing and forming mechanism 12;
s2, heating and rolling the positive conductive dry powder (such as particles made of NMC, conductive additives and binders, and the average particle size is about 1 mm) at 120-150 ℃ by a first dry powder rolling film-forming mechanism 5 to form a positive electrode film;
heating and rolling the negative conductive dry powder (such as particles made of graphite, conductive additive and binder, and the average particle diameter is about 1 mm) at 120-150 ℃ by a second dry powder rolling film-forming mechanism 7 to form a negative electrode film;
after the edge cutting modification of the pressed positive electrode film and the pressed negative electrode film is respectively carried out by the first electrode film edge cutting mechanism 6 and the second electrode film edge cutting mechanism 8, the pressed positive electrode film and the pressed negative electrode film are respectively guided by the positive electrode film guide roller 9 and the negative electrode film guide roller 11 and are conveyed into the electrode plate pressing forming mechanism 12;
s3, rolling and combining the positive electrode film, the current collector and the negative electrode film by using a pole piece pressing and forming mechanism 12 to prepare a pole piece, wherein the rolling pressure is more than 150kN and the maximum linear load is 600-1500N/mm;
and S4, discharging the pole piece 22 pressed by the pole piece pressing and forming mechanism 12, cooling the pole piece to be less than 40 ℃ by the pole piece cooling mechanism 13, sequentially performing thickness test and visual detection by the thickness measuring mechanism 14 and the CCD detection mechanism 15, and then winding and discharging by the pole piece winding mechanism 17.
When the thickness measuring mechanism 14 tests pole segments with unqualified thickness, the unqualified pole segments need to be cut off, and then the winding is continued after the tape is connected at the winding and tape connecting platform 16; and the thickness measuring mechanism 14 can feed back thickness measuring information to the pole piece pressing and forming mechanism 12 so as to adjust the thickness of the pressed pole piece and enable the thickness of the produced pole piece to reach the standard. Similarly, when the defective pole segments detected by the CCD detection mechanism 15 are defective, the defective pole segments need to be cut off, and then the winding is continued after the tape is joined at the winding and joining platform 16.
The above embodiments are merely preferred embodiments of the present invention, and the technical solutions of the present invention are described in further detail, but the above descriptions are exemplary, not exhaustive, and are not limited to the disclosed embodiments, the scope and implementation of the present invention are not limited thereto, and any changes, combinations, deletions, substitutions or modifications that do not depart from the spirit and principle of the present invention are included in the scope of the present invention.
Claims (14)
1. A dry coating pressed pole piece production system is characterized by comprising a first dry powder calendering film-forming mechanism, a second dry powder calendering film-forming mechanism and a pole piece pressing forming mechanism;
the first dry powder rolling film-forming mechanism and the second dry powder rolling film-forming mechanism can respectively carry out rolling forming on the positive electrode film and the negative electrode film; the pole piece pressing and forming mechanism can press the current collector, the positive electrode film and the negative electrode film into the pole piece.
2. The system for producing a dry coating pressed pole piece according to claim 1, wherein the first dry powder calendaring film forming mechanism comprises a first calendaring roller set and a first dry powder feeding system; the first calendering roller group comprises a first calendering roller pair, and the first dry powder feeding system comprises a first dry powder hopper; the discharge hole of the first dry powder hopper corresponds to the space between the first calendering rollers and can be used for blanking the dry powder material contained in the first dry powder hopper to the gap between the first calendering rollers;
and/or the second dry powder calendering film-forming mechanism comprises a second calendering roller group and a second dry powder feeding system; the second calendering roller group comprises a second calendering roller, and the second dry powder feeding system comprises a second dry powder hopper; and a discharge port of the second dry powder hopper corresponds to the space between the second calendering rollers and can discharge the dry powder material loaded into the space between the second calendering rollers.
3. The system for producing the dry coating pressed pole piece according to the claim 2, wherein a first aggregate container is respectively arranged below the first calendering pair roller; and/or a second aggregate container is arranged below the second calendering roller.
4. The system for producing the pressed pole pieces by dry coating according to claim 1, wherein a corona treatment mechanism is arranged on the feeding side of the pole piece pressing and forming mechanism; corona treatment mechanism includes front corona roller and back corona roller, the feeding the mass flow body can openly hug closely respectively front corona roller and back are hugged closely back corona roller has gone on the roller, and by front corona roller with back corona roller is right respectively the front and the back of the mass flow body carry out corona treatment.
5. The system for producing the pressed pole pieces by dry coating according to claim 1, wherein a current collector preheating mechanism is arranged on the feeding side of the pole piece pressing and forming mechanism; the current collector preheating mechanism comprises a preheating roller, and the fed current collector can pass through the preheating roller and is heated by the preheating roller.
6. The system for producing the dry coating pressed pole piece according to claim 1, wherein a first electrode film trimming mechanism is arranged between the pole piece pressing and forming mechanism and the first dry powder calendering and film forming mechanism, and the first electrode film trimming mechanism comprises an upper cutter and a lower cutter which are arranged in a matching manner;
and/or a second electrode film trimming mechanism is arranged between the pole piece pressing and forming mechanism and the second dry powder calendering and film forming mechanism, and comprises an upper cutter and a lower cutter which are arranged in a matched mode.
7. The system for producing the pressed pole piece with the dry coating according to claim 1, wherein a positive electrode film guide roller, a current collector guide roller and a negative electrode film guide roller are arranged on the feeding side of the pole piece pressing and forming mechanism and can respectively guide a positive electrode film, a current collector and a negative electrode film in order to enter the pole piece pressing and forming mechanism.
8. The system of claim 1, wherein the pole piece press forming mechanism comprises a pair of rolls in mating arrangement.
9. The system for producing the pressed pole pieces by the dry coating according to claim 1, wherein a pole piece cooling mechanism is arranged on a discharge side of the pole piece pressing and forming mechanism; the pole piece cooling mechanism comprises a cooling roller, and the pressed and formed pole piece can pass through the cooling roller and is cooled by the cooling roller.
10. The system for producing the pressed pole piece by the dry coating according to claim 1, wherein a thickness measuring mechanism is arranged on a discharging side of the pole piece pressing and forming mechanism, the thickness measuring mechanism comprises a thickness gauge, and a thickness measuring feeding supporting roller and a thickness measuring discharging supporting roller are respectively arranged on a feeding side and a discharging side of the thickness gauge;
and/or, the discharge side of the pole piece compression molding mechanism is provided with a CCD detection mechanism, the CCD detection mechanism comprises a front detection supporting roller and a back detection supporting roller, and the pole piece subjected to compression molding can be respectively and positively clung to the front detection supporting roller and the back detection supporting roller to be clung to the back detection supporting roller to pass through the roller.
11. The system for producing the pressed pole piece by the dry coating according to any one of claims 1 to 10, wherein a pole piece rolling mechanism is provided, and the pole piece rolling mechanism comprises a rolling shaft which can roll the pressed and synthesized pole piece; and/or, be provided with mass flow body unwinding mechanism, mass flow body unwinding mechanism can unreel the mass flow body coil stock including unreeling the axle.
12. The system for producing the pressed pole pieces through the dry coating according to claim 11, wherein an unreeling tape splicing platform is arranged on a discharge side of the current collector unreeling mechanism; and/or a rolling belt receiving platform is arranged on the feeding side of the pole piece rolling mechanism.
13. A production method of a dry coating pressed pole piece is characterized by comprising the following steps:
s1, carrying out corona and preheating treatment on a current collector to obtain a pretreated current collector;
s2, heating and rolling the positive conductive dry powder to obtain a positive electrode film; heating and rolling the negative electrode conductive dry powder to obtain a negative electrode film;
s3, stacking the pretreatment current collector between the positive electrode film and the negative electrode film, and rolling to combine and mold the positive electrode film, the negative electrode film and the pretreatment current collector;
and S4, cooling to obtain the dry coating pressed pole piece.
14. The method for producing a dry coating pressed pole piece according to claim 13, wherein the positive electrode film and the negative electrode film are trimmed before the roll forming.
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| CN202210945419.9A CN115148947A (en) | 2022-08-08 | 2022-08-08 | Production system and production method for dry coating pressed pole piece |
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| CN202210945419.9A CN115148947A (en) | 2022-08-08 | 2022-08-08 | Production system and production method for dry coating pressed pole piece |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116682929A (en) * | 2023-07-04 | 2023-09-01 | 肇庆理士电源技术有限公司 | Automatic production line for dry electrode preparation of power battery |
| CN116722097A (en) * | 2023-07-04 | 2023-09-08 | 肇庆理士电源技术有限公司 | Current collector composite device for dry electrode production |
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2022
- 2022-08-08 CN CN202210945419.9A patent/CN115148947A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116682929A (en) * | 2023-07-04 | 2023-09-01 | 肇庆理士电源技术有限公司 | Automatic production line for dry electrode preparation of power battery |
| CN116722097A (en) * | 2023-07-04 | 2023-09-08 | 肇庆理士电源技术有限公司 | Current collector composite device for dry electrode production |
| CN116682929B (en) * | 2023-07-04 | 2024-02-20 | 肇庆理士电源技术有限公司 | Automatic production line for dry electrode preparation of power battery |
| CN116722097B (en) * | 2023-07-04 | 2024-03-22 | 肇庆理士电源技术有限公司 | Current collector composite device for dry electrode production |
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