CN115084665B - A method for improving the compaction density of lithium battery pole pieces - Google Patents
A method for improving the compaction density of lithium battery pole pieces Download PDFInfo
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- CN115084665B CN115084665B CN202210913564.9A CN202210913564A CN115084665B CN 115084665 B CN115084665 B CN 115084665B CN 202210913564 A CN202210913564 A CN 202210913564A CN 115084665 B CN115084665 B CN 115084665B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005056 compaction Methods 0.000 title claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 28
- 238000000576 coating method Methods 0.000 claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims abstract description 25
- 238000004804 winding Methods 0.000 claims abstract description 18
- 239000003792 electrolyte Substances 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 11
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 10
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 13
- 238000003860 storage Methods 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 9
- 239000013543 active substance Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 5
- 230000003213 activating effect Effects 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000006255 coating slurry Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005096 rolling process Methods 0.000 abstract description 4
- 230000004913 activation Effects 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
本发明涉及锂离子电池技术领域，尤其涉及一种提高锂电池极片压实密度的方法。其主要针对极片加工的浆料的密实度不高，影响极片对电解液的吸收等问题，提出如下技术方案：所述锂电池的制备方法包括以下步骤：S1、制片；S1.1、将浆料输送至涂布机头本体内；S1.2、超声波发生器对涂覆有浆料的极片处理；S1.3、烤箱本体烘干加工，获得锂电池极片；S1.4、收卷辊对极片收卷；S2、组装；S3、活化。本发明极片制备设备集成度高，使用方便，对极片超声波振动处理，提升极片一致性，提高压实密度，便于极片辊压，增强极片对电解液的吸收，降低溶剂的使用量，提高极片的烘烤效率，同时降低烤箱的成本投入，节约能耗，主要应用于锂离子电池生产过程的涂布工艺。
The present invention relates to the technical field of lithium-ion batteries, and in particular to a method for improving the compaction density of lithium battery pole pieces. It mainly aims at the problem that the density of the slurry processed by the pole piece is not high, which affects the absorption of the electrolyte by the pole piece, and proposes the following technical scheme: the preparation method of the lithium battery includes the following steps: S1, film making; S1.1, conveying the slurry to the coating head body; S1.2, ultrasonic generator treating the pole piece coated with the slurry; S1.3, oven body drying processing to obtain the lithium battery pole piece; S1.4, winding roller winding the pole piece; S2, assembly; S3, activation. The pole piece preparation equipment of the present invention has high integration and is easy to use. It can treat the pole piece with ultrasonic vibration, improve the consistency of the pole piece, improve the compaction density, facilitate the rolling of the pole piece, enhance the absorption of the electrolyte by the pole piece, reduce the use of solvent, improve the baking efficiency of the pole piece, and reduce the cost investment of the oven, saving energy consumption, and is mainly used in the coating process of the lithium-ion battery production process.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a method for improving the compaction density of a lithium battery pole piece.
Background
Lithium ion power batteries are used as a power source of new energy electric vehicles, and are rapidly popularized and developed in recent years along with electric vehicles. The lithium ion power battery mainly comprises a positive electrode, a negative electrode, a diaphragm, electrolyte and the like, and the main manufacturing process is tabletting, assembling and activating. The preparation method comprises the steps of coating positive and negative active substances on a base material in a slurry mode, cutting the positive and negative active substances into a size and a shape suitable for assembly, assembling the battery into a battery shell after cutting the pole pieces or winding or stacking, connecting the inside of the battery in a welding mode, injecting electrolyte into the assembled battery, performing formation and charging, and repeatedly charging and discharging the battery after formation.
In the patent CN102299370B, a lithium ion power battery and a preparation method of the lithium ion power battery are proposed, in the scheme, when the positive electrode or the negative electrode plate is processed, the slurry is uniformly coated on an aluminum foil through an automatic feeding system and a coating machine, and the battery electrode plate is obtained after baking at 80 ℃ for 12 hours in a vacuum environment, rolling and slitting. However, the traditional method for coating the slurry has long drying time through an oven, long pole piece processing period and low compacted density of the slurry, and is unfavorable for the absorption of electrolyte by the electrode piece, and in view of the problem, we propose a method for improving the compacted density of the lithium battery pole piece.
Disclosure of Invention
The invention aims to solve the problems that in the background technology, the compactness of slurry for pole piece processing is not high, the cost is increased due to long drying period of a pole piece, the absorption of electrolyte by the pole piece is influenced, and the like, and provides a method for improving the compacted density of the pole piece of a lithium battery.
The technical scheme of the invention is that the method for improving the compaction density of the lithium battery pole piece comprises a preparation method of the lithium battery, and the preparation method of the lithium battery comprises the following steps:
S1, tabletting equipment comprises a coating machine head body, a mounting frame, an oven body and a winding roller, wherein a plurality of groups of guide rollers for guiding substrate transmission are arranged on the coating machine head body, an ultrasonic generator is arranged in the mounting frame, the mounting frame is positioned in a front end output area of the oven body, and the winding roller is arranged in a rear end output area of the oven body;
S1.1, respectively preparing positive and negative active substances, respectively processing and mixing the two different active substances to form slurry, and conveying the slurry into a coater head body;
s1.2, arranging a mounting frame between a coating machine head body and an oven body, uniformly coating slurry on the surface of a base material through the coating machine head body, and treating the pole piece coated with the slurry by combining an ultrasonic generator in the mounting frame;
S1.3, enabling the base material treated by the ultrasonic generator to enter the oven body through the front end output area of the oven body for drying and processing to obtain a lithium battery pole piece;
s1.4, winding a pole piece in an output area at the rear end of the oven body through a winding roller after drying is finished;
s2, assembling, namely cutting the pole piece which is coated with the slurry and dried in the S1, winding or stacking the cut pole piece, and then loading the pole piece into a lithium ion battery shell, wherein the connection in the battery is performed in a welding mode;
s3, activating, namely injecting electrolyte into the battery assembled in the S2, and then performing formation charging to activate the battery.
Preferably, the inner wall of the mounting frame is provided with a transverse plate for mounting the ultrasonic generator, the top of the ultrasonic generator is provided with a contact plate which is fixedly and horizontally mounted on the inner wall of the mounting frame, and the outer diameter of the contact plate is larger than the top area of the ultrasonic generator.
Preferably, a plurality of first circulation grooves which are longitudinally arranged are formed in the top of the contact plate, and one ends of the first circulation grooves are connected with second circulation grooves which are positioned at the top of the contact plate in a converging mode.
Preferably, the depth of the second circulation groove is greater than that of the first circulation groove, the bottom of the second circulation groove is connected with a conveying pipe, the other end of the conveying pipe is connected with a collecting box mounted on the transverse plate in a sealing manner, and a liquid outlet pipe is mounted on the collecting box.
Preferably, the top of contact plate is equipped with the mounting panel of movable mounting in the mounting bracket, the below of mounting panel is equipped with the guiding mechanism that is located the contact plate top, rotate on the mounting panel and be connected with the screw rod, the bottom rotation of screw rod is connected with the lifter plate, the both sides wall of lifter plate is connected with the slider.
Preferably, the bottom of mounting panel is connected with the spacing cardboard that is located the lifter plate both sides, two all seted up the spout along its direction of height on the spacing cardboard, the inner wall sliding connection of slider and spout.
Preferably, the two sides of the mounting plate are connected with connecting plates, the two sides of the mounting frame are provided with connecting ports, and the inner diameter of the connecting plates is matched with the inner diameter of the connecting ports.
Preferably, two groups of storage grooves are formed in one side wall of the connecting plate, pull blocks are slidably connected to the inner walls of the storage grooves, one ends of the pull blocks, located inside the storage grooves, are connected with limiting rods, the limiting rods are slidably connected with the inner walls of the storage grooves, and the vertical sections of the storage grooves are T-shaped grooves.
Preferably, a plurality of rotating grooves are formed in the bottom of the lifting plate, a plurality of groups of rotating rollers are rotatably mounted in the rotating grooves, one side of the ultrasonic generator is electrically connected with a controller, and the controller is detachably connected with the outer wall of the mounting frame.
Preferably, a plurality of observation openings are arranged on one side of the oven body, and the base material in the S1 is any one of copper or aluminum.
Compared with the prior art, the invention has the following beneficial technical effects:
1. The ultrasonic generator added in the sheet making process can release ultrasonic waves with proper intensity and frequency, the pole piece is still in a wet pole piece state before the pole piece coated by the coating machine head body enters the oven body, and the pole piece firstly passes through the ultrasonic generator and is set to proper intensity and frequency, so that the wet coating is distributed more uniformly and compactly under the vibration of ultrasonic waves. The pole piece subjected to ultrasonic vibration is convenient to bake, the compaction density of the pole piece can be improved, rolling is facilitated, absorption of electrolyte by the pole piece after liquid injection is facilitated, and the overall consistency of the battery is improved;
2. According to the invention, when the pole piece vibrated by ultrasonic passes through the contact plate arranged above the ultrasonic generator, the fallen slurry is collected in a concentrated way through the first circulating groove, the second circulating groove and the collecting box, so that the slurry is collected for repeated use, the waste of the slurry is reduced, and meanwhile, the pollution at the top of the ultrasonic generator is avoided;
3. According to the invention, the coated pole piece is pushed downwards according to the rotation of the screw rod through the arrangement of the adjusting mechanism, so that the distance between the pole piece and the ultrasonic generator is adjustable, and the ultrasonic effect emitted by the ultrasonic generator is better;
4. According to the invention, through the arrangement of the mounting plate, the connecting plate and the connecting port, the mounting plate and the adjusting mechanism are convenient to disassemble and overhaul, or the mounting plate with different distances between the two limiting clamping plates is replaced according to different widths of the pole pieces, so that the pole pieces are fully contacted with the bottoms of the lifting plates, and the downward pushing laminating performance of the pole pieces is improved;
5. In conclusion, the pole piece preparation equipment disclosed by the invention has the advantages of high integration level, convenience in use, ultrasonic vibration treatment on the pole piece, improvement of consistency of the pole piece, improvement of compaction density, convenience in pole piece rolling, enhancement of absorption of the pole piece to electrolyte, reduction of the use amount of a solvent, improvement of the baking efficiency of the pole piece, reduction of cost input of an oven and energy consumption saving.
Drawings
FIG. 1 is a front view of a production apparatus;
FIG. 2 is a schematic view of the mounting plate and adjustment mechanism of FIG. 1;
FIG. 3 is a schematic view of the flipped state of FIG. 2;
FIG. 4 is a schematic view of the structure of the ultrasonic generator and contact plate of FIG. 1;
fig. 5 is a flowchart of a method of manufacturing a lithium battery.
Reference numerals:
1. a coater head body; 2, a guide roller, 3, a mounting rack;
4. oven body 41, inlet 42 and observation port;
5. A wind-up roll, 6, an ultrasonic generator;
7. A contact plate; 71, a first circulation tank, 72, a second circulation tank, 73, a conveying pipe, 74 and a collecting box;
8. an adjusting mechanism; 81, lifting plates, 82, rotating rollers, 83, screws, 84 and sliding blocks;
9. 91 of a mounting plate, 92 of a limiting clamping plate, 93 of a sliding chute, 93 of a connecting plate, 931 of a containing groove, 932 of a pulling block, 933 of a limiting rod;
10. And a connecting port.
Detailed Description
The technical scheme of the invention is further described below with reference to the attached drawings and specific embodiments.
Examples
As shown in fig. 1-5, compared with the first embodiment, the present embodiment further includes a method for preparing a lithium battery, and referring to fig. 5, the method for preparing a lithium battery includes the following steps:
S1, tabletting and tabletting equipment comprises a coating machine head body 1, a mounting frame 3, an oven body 4 and a winding roller 5, wherein a plurality of groups of guide rollers 2 for guiding substrate transmission are arranged on the coating machine head body 1.
The inner wall of mounting bracket 3 is provided with the diaphragm that is used for installing supersonic generator 6, and supersonic generator 6's one side wire electric connection has the controller, and the controller can be dismantled with the outer wall of mounting bracket 3 and be connected, and the controller is used for controlling supersonic generator 6 to open and stop, and supersonic generator 6 adopts current supersonic generator that possesses regulation frequency and vibration intensity can. As shown in fig. 4, the top of the ultrasonic generator 6 is provided with a contact plate 7 which is fixedly and horizontally installed on the inner wall of the installation frame 3, the top of the contact plate 7 is provided with a mounting plate 9 which is movably installed in the installation frame 3, the outer diameter of the contact plate 7 is larger than the top area of the ultrasonic generator 6, the top of the contact plate 7 is provided with a plurality of first circulating grooves 71 which are longitudinally arranged, one ends of the first circulating grooves 71 are converged and connected with a second circulating groove 72 which is positioned at the top of the contact plate 7, the depth of the second circulating groove 72 is larger than that of the first circulating groove 71, the second circulating groove 72 is used for temporarily storing slurry converged in the first circulating grooves 71, the bottom of the second circulating groove 72 is connected with a material conveying pipe 73, the other end of the material conveying pipe 73 is hermetically connected with a collecting box 74 which is installed on a transverse plate and flows into the collecting box 74 through the material conveying pipe 73, a liquid outlet pipe is installed on the collecting box 74, a sealing plug is arranged in the liquid outlet pipe, and the transverse plate is detachably connected with the bottom of the ultrasonic generator 6. As shown in FIG. 2, the adjusting mechanism 8 above the contact plate 7 is arranged below the mounting plate 9, the screw 83 is rotationally connected to the mounting plate 9, the bottom of the mounting plate 9 is connected with limit clamping plates 91 positioned at two sides of the lifting plate 81, sliding grooves 92 are formed in the two limit clamping plates 91 along the height direction of the two limit clamping plates, sliding blocks 84 are connected to two side walls of the lifting plate 81, the sliding blocks 84 are slidably connected with the inner walls of the sliding grooves 92, as shown in FIG. 3, the lifting plate 81 is rotationally connected to the bottom of the screw 83, a plurality of rotating grooves are formed in the bottom of the lifting plate 81, rotating rollers 82 are rotationally arranged in the rotating grooves, the rotating rollers 82 are the same as the processed pole piece in width, the adjusting mechanism 8 can be integrally replaced according to the width of the pole piece, and the full contact between the rotating rollers 82 and the pole piece is ensured, so that the pole piece is positioned in the space between the two limit clamping plates 91, the limit clamping plates 91 limit the pole piece to the top center position of the ultrasonic generator 6, the slurry coated outside the pole piece receives uniform vibration, and the compactness of the pole piece is improved.
As shown in fig. 2 and 3, the two sides of the mounting plate 9 are connected with the connecting plates 93, the two sides of the mounting frame 3 are provided with the connecting ports 10, the inner diameter of the connecting plates 93 is matched with the inner diameter of the connecting ports 10, one side wall of each connecting plate 93 is provided with two groups of containing grooves 931, the inner walls of the containing grooves 931 are slidably connected with the pull blocks 932, one ends of the pull blocks 932 positioned inside the containing grooves 931 are connected with the limiting rods 933, the limiting rods 933 are slidably connected with the inner walls of the containing grooves 931, the vertical section of the containing grooves 931 is a T-shaped groove, and the vertical section of the pull blocks 932 is also of a T-shaped structure.
As shown in fig. 1, the mounting frame 3 is located in a front end output area of the oven body 4, and a wind-up roll 5 is arranged in a rear end output area of the oven body 4;
S1.1, preparing positive and negative active substances respectively, processing and mixing two different active substances respectively to form slurry, conveying the slurry into a coating machine head body 1, wherein a base material is any one of copper materials or aluminum materials;
S1.2, arranging a mounting frame 3 between a coating machine head body 1 and an oven body 4, uniformly coating slurry on the surface of a substrate through the coating machine head body 1, and treating the pole piece coated with the slurry by combining an ultrasonic generator 6 in the mounting frame 3;
s1.3, a base material treated by the ultrasonic generator 6 enters the oven body 4 through a front end output area of the oven body 4 to be dried, wherein one side of the oven body 4 is provided with a plurality of observation ports 42 for observing the drying effect of the pole piece to obtain a lithium battery pole piece;
s1.4, winding a pole piece in an output area at the rear end of the oven body 4 through a winding roller 5 after drying is finished;
s2, assembling, namely cutting the pole piece which is coated with the slurry and dried in the S1, winding or stacking the cut pole piece, and then loading the pole piece into a lithium ion battery shell, wherein the connection in the battery is performed in a welding mode;
s3, activating, namely injecting electrolyte into the battery assembled in the S2, and then performing formation charging to activate the battery.
In the embodiment, the sizing agent is coated on the pole piece through the coating machine head body 1, the coating machine head body 1 adopts common coating, namely any one of a scraper type, a roll coating transfer type and a slit extrusion type can be adopted, the pole piece passes through the middle of the contact plate 7 and the adjusting mechanism 8 through the guiding of the guide roller 2, enters the oven body 4 from the inlet 41, is provided with the winding roller 5 in the rear end output area of the oven body 4, and winds one end of the pole piece;
Before processing the pole piece, according to the width of the pole piece, a mounting plate 9 with a proper size is selected, the proper distance between the width of the pole piece and the two limiting clamping plates 91 is the same, the purpose of the operation of the step is that the pole piece can be fully attached to a rotating roller 82 at the bottom of a lifting plate 81, under the guiding transmission of the rotating roller 82 and the setting of the limiting clamping plates 91, the pole piece can be positioned at the middle position of the top of an ultrasonic generator 6 and is not in contact with 7, so that the vibration generated by the ultrasonic generator 6 has even action on the pole piece. After selecting a proper mounting plate 9, mounting the mounting plate 9 and the mounting frame 3, firstly sliding the pull blocks 932 along the inner wall of the storage groove 931 to enable the two pull blocks 932 to be close to each other, at this time, storing the two limit rods 933 in the storage groove 931, after one connecting plate 93 corresponds to the connecting port 10, loosening the pull blocks 932, and the fact that rebound springs are arranged in grooves of the pull blocks 932 is needed to be described, keeping the two limit rods 933 away from to enable one connecting plate 93 to be mounted with one connecting port 10, secondly adopting the same method, pushing the mounted one connecting plate 93 along the connecting port 10 to enable the other connecting plate 93 to correspond to the other connecting port 10, and completing the same mounting.
Before the ultrasonic generator 6 is started to be used, the screw 83 is rotated, the lifting plates 81 with the sliding blocks 84 connected to the two sides are guided to move downwards along the sliding grooves 92 by the rotation of the screw 83, the rotating rollers 82 at the bottoms of the lifting plates 81 are in contact with the pole pieces, the pole pieces are pressed towards the position close to the ultrasonic generator 6, the pole pieces are limited by the limiting clamping plates 91 on the two sides, and the vibration contact with the ultrasonic generator 6 is more uniform under the downward pressing action of the lifting plates 81.
At this time, the ultrasonic generator 6 is started, so that the ultrasonic generator 6 adjusts proper intensity and frequency, and ultrasonic vibration treatment is performed on the pole piece which does not enter the oven body 4 and the slurry which is not dried yet, so that the wet coating is distributed more uniformly and compactly under the vibration of ultrasonic waves. The pole piece subjected to ultrasonic vibration is not only convenient to bake, but also can improve the compaction density of the pole piece and is convenient to roll, and the absorption of the pole piece to electrolyte after liquid injection is also facilitated, so that the overall consistency of the battery is improved. While the ultrasonic generator 6 ultrasonically processes the pole piece, a portion of the slurry falls off the pole piece, and the slurry is collected into a collection box 74 through a first circulation tank 71 and a second circulation tank 72 and is utilized after post-treatment. The pole piece processed by the ultrasonic generator 6 enters the oven body 4 through the inlet 41 for drying, the drying speed of the pole piece at the moment is faster, the baking efficiency of the oven body 4 is improved, the equipment investment is reduced, and the pole piece is collected through the winding roller 5 in a concentrated mode. Finally, the assembly and the activation processing are carried out.
The above-described embodiments are merely preferred embodiments of the present invention, and many alternative modifications and combinations of the above-described embodiments will be apparent to those skilled in the art based on the technical solutions of the present invention and the related teachings of the above-described embodiments.
Claims (5)
1. The method for improving the compaction density of the lithium battery pole piece comprises a preparation method of the lithium battery, and is characterized by comprising the following steps of:
The equipment for producing the sheet comprises a coating machine head body (1), a mounting frame (3), an oven body (4) and a wind-up roll (5), wherein a plurality of groups of guide rolls (2) for guiding substrate transmission are arranged on the coating machine head body (1), an ultrasonic generator (6) is arranged in the mounting frame (3), a transverse plate for mounting the ultrasonic generator (6) is arranged on the inner wall of the mounting frame (3), a contact plate (7) which is fixedly and horizontally arranged on the inner wall of the mounting frame (3) is arranged at the top of the ultrasonic generator (6), and the outer diameter of the contact plate (7) is larger than the top area of the ultrasonic generator (6);
The mounting frame (3) is positioned in the front end output area of the oven body (4), and a winding roller (5) is arranged in the rear end output area of the oven body (4);
The top of the contact plate (7) is provided with a mounting plate (9) movably mounted in the mounting frame (3), an adjusting mechanism (8) positioned above the contact plate (7) is arranged below the mounting plate (9), a screw (83) is rotationally connected to the mounting plate (9), a lifting plate (81) is rotationally connected to the bottom of the screw (83), and sliding blocks (84) are connected to two side walls of the lifting plate (81);
The bottom of the mounting plate (9) is connected with limiting clamping plates (91) positioned at two sides of the lifting plate (81), sliding grooves (92) are formed in the two limiting clamping plates (91) along the height direction of the limiting clamping plates, and the sliding blocks (84) are in sliding connection with the inner walls of the sliding grooves (92);
Connecting plates (93) are connected to two sides of the mounting plate (9), connecting ports (10) are formed in two sides of the mounting frame (3), and the inner diameter of the connecting plates (93) is matched with the inner diameter of the connecting ports (10);
Two groups of storage grooves (931) are formed in one side wall of the connecting plate (93), pull blocks (932) are connected to the inner wall of the storage grooves (931) in a sliding mode, one ends of the pull blocks (932) located inside the storage grooves (931) are connected with limiting rods (933), the limiting rods (933) are connected with the inner wall of the storage grooves (931) in a sliding mode, and the vertical sections of the storage grooves (931) are T-shaped grooves;
s1.1, respectively preparing positive and negative active substances, respectively processing and mixing the two different active substances to form slurry, and conveying the slurry into a coating machine head body (1);
S1.2, arranging a mounting frame (3) between the coating machine head body (1) and the oven body (4), uniformly coating slurry on the surface of a substrate through the coating machine head body (1), and treating the pole piece coated with the slurry by combining an ultrasonic generator (6) in the mounting frame (3);
S1.3, enabling the base material treated by the ultrasonic generator (6) to enter the oven body (4) through the front end output area of the oven body (4) for drying and processing to obtain a lithium battery pole piece;
S1.4, winding a pole piece in an output area at the rear end of the oven body (4) through a winding roller (5) after drying is finished;
s2, assembling, namely cutting the pole piece which is coated with the slurry and dried in the S1, winding or stacking the cut pole piece, and then loading the pole piece into a lithium ion battery shell, wherein the connection in the battery is performed in a welding mode;
s3, activating, namely injecting electrolyte into the battery assembled in the S2, and then performing formation charging to activate the battery.
2. The method for improving the compaction density of the lithium battery pole pieces according to claim 1, wherein a plurality of first circulating grooves (71) which are longitudinally arranged are formed in the top of the contact plate (7), and second circulating grooves (72) which are positioned in the top of the contact plate (7) are converged and connected at one end of each first circulating groove (71).
3. The method for improving the compaction density of the lithium battery pole pieces according to claim 2, wherein the depth of the second circulation groove (72) is larger than that of the first circulation groove (71), a conveying pipe (73) is connected to the bottom of the second circulation groove (72), a collecting box (74) mounted on a transverse plate is connected to the other end of the conveying pipe (73) in a sealing mode, and a liquid outlet pipe is mounted on the collecting box (74).
4. The method for improving the compaction density of the lithium battery pole pieces according to claim 1, wherein a plurality of rotating grooves are formed in the bottom of the lifting plate (81), a plurality of groups of rotating rollers (82) are rotatably arranged in the rotating grooves, one side of the ultrasonic generator (6) is electrically connected with a controller, and the controller is detachably connected with the outer wall of the mounting frame (3).
5. The method for improving the compaction density of the lithium battery pole piece according to claim 1, wherein a plurality of observation openings (42) are arranged on one side of the oven body (4), and the base material in the step S1 is any one of copper or aluminum.
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