Search

CN-121972049-A - Powder processing mechanism and dry mixing method

CN121972049ACN 121972049 ACN121972049 ACN 121972049ACN-121972049-A

Abstract

The invention relates to a powder processing mechanism and a dry mixing method, comprising a mixing module, a compaction module, a kneading module, a breaking module and a shaping module which are sequentially stacked along the vertical direction, wherein the mixing module is used for mixing and dispersing preset multiple powder materials and outputting primarily mixed first mixed powder, the compaction module is used for mechanically fusing the first mixed powder and outputting uniformly coated second mixed powder, the kneading module is used for kneading and homogenizing the second mixed powder and outputting a third mixed bulk body with a three-dimensional fiber network, the breaking module is used for breaking the third mixed bulk body and outputting fourth mixed powder with the particle size of centimeter level or less, and the shaping module is used for shaping the fourth mixed powder and outputting fifth mixed powder with the particle size of millimeter level or less. Through the integration of multiple modules, the continuous mixing dispersion, the fusion coating and the homogeneous kneading of multiple powder materials can be realized, the degree and the uniformity of the fibrosis of the adhesive can be accurately regulated and controlled, and the grain diameter precision can be accurately controlled, so that the continuous production can be realized.

Inventors

  • ZHANG TAISHENG
  • LU QIHUI
  • WU YUXIANG

Assignees

  • 无锡理奇智能装备股份有限公司

Dates

Publication Date
20260505
Application Date
20260205

Claims (10)

  1. 1. The powder treatment mechanism is characterized by comprising a plurality of modules which are sequentially stacked and respectively provided with different treatment components, wherein the plurality of modules sequentially comprise a mixing module, a compaction module, a kneading module, a breaking module and a shaping module along a powder treatment path, the mixing module is configured to mix, disperse and output primarily mixed first mixed powder of preset multiple powder, the compaction module is configured to mechanically fuse the first mixed powder and output uniformly coated second mixed powder, the kneading module is configured to knead and homogenize the second mixed powder and output a third mixed bulk body with a three-dimensional fiber network, the breaking module is configured to break the third mixed bulk body and output fourth mixed powder with a centimeter level and below particle size, and the shaping module is configured to shape the fourth mixed powder and output fifth mixed powder with the centimeter level and below particle size.
  2. 2. A powder handling mechanism as set forth in claim 1, wherein a plurality of said modules are stacked in a vertical sequence and are in controlled communication.
  3. 3. The powder processing mechanism as set forth in claim 1, wherein each of the modules has a feed inlet and a discharge outlet, and the discharge outlets of two adjacent modules are disposed in overlapping relation with the feed inlet.
  4. 4. A powder handling mechanism as set forth in claim 1, wherein a first valve body is disposed between said mixing module and said tapping module and/or a second valve body is disposed between said tapping module and said kneading module and/or a third valve body is disposed between said kneading module and said breaking module.
  5. 5. The powder processing mechanism as set forth in claim 1, wherein the mixing module comprises a mixing cylinder, a connecting shaft vertically rotatably mounted in the mixing cylinder, and a mixing assembly sleeved on the connecting shaft, and the mixing assembly comprises dust raising blades, shearing dispersing blades and ox horn blades arranged at intervals in the axial direction.
  6. 6. The powder handling mechanism of claim 1, wherein the tapping module comprises a tapping cylinder, a blade mounted in the tapping cylinder in a horizontally rotatable manner, and a tapping assembly mounted on the blade, the tapping assembly comprising a plurality of circumferentially spaced first blade sets and a plurality of second blade sets, adjacent first blade sets and second blade sets being disposed in an axially staggered manner.
  7. 7. A powder handling mechanism as set forth in claim 1, wherein the kneading module comprises a kneading cylinder and a rotor assembly horizontally rotatably mounted in the kneading cylinder, the rotor assembly comprising two kneading rotors disposed in parallel and having intermeshing or shearing rotors, respectively.
  8. 8. The powder processing mechanism according to claim 1, wherein the breaking module comprises a breaking cylinder, a breaking assembly horizontally arranged in the breaking cylinder, and a sieve plate positioned below the breaking assembly and provided with a first particle size control, and the breaking assembly comprises a rotatable rotor disc, a plurality of hammers arranged on the rotor disc, and a plurality of impact plates arranged on the inner wall of the breaking cylinder and corresponding to the hammers.
  9. 9. A powder handling mechanism as set forth in claim 1, wherein the shaping module comprises a shaping cylinder, a shaping assembly mounted vertically within the shaping cylinder, the shaping assembly comprising a rotatable shaping rotor and a shaping stator surrounding the shaping rotor and having a second particle size control.
  10. 10. A dry mixing method for a powder handling mechanism according to any one of claims 1 to 9, comprising the steps of: s1, performing mixing and dispersing on preset multi-powder in a mixing module to obtain primarily mixed first mixed powder, and then enabling the primarily mixed first mixed powder to fall into a compaction module; s2, performing mechanical fusion on the first mixed powder in the compaction module to obtain uniformly coated second mixed powder, and then enabling the second mixed powder to fall into the kneading module; s3, kneading the second mixed powder in a kneading module to obtain a third mixed bulk body with a three-dimensional fiber network, and then falling into a block breaking module; S4, crushing the third mixed bulk in a block breaking module to obtain fourth mixed powder with the particle size of centimeter grade or below, and then falling the fourth mixed powder into a shaping module; S5, shaping the fourth mixed powder in a shaping module to obtain fifth mixed powder with the particle size of millimeter or below.

Description

Powder processing mechanism and dry mixing method Technical Field The invention relates to the field of powder treatment, in particular to a powder treatment mechanism and a dry mixing method suitable for a secondary battery. Background The dry electrode process is a novel lithium ion battery electrode manufacturing technology, active materials, conductive agents and binders are directly manufactured into electrodes through physical mixing and machining, a liquid solvent is not needed, and the advantages of being green and environment-friendly, capable of improving electrode compaction density and the like are achieved. In the prior art, the dry-mixing step is a core link of dry electrode preparation, and processes such as mixing, kneading and the like are sequentially and respectively carried out by a plurality of special equipment, so that active substances, conductive agents and binders are mixed in proportion to form a uniform dry powder mixture. However, the conventional dry blending step relies on various special equipment for batch production, and mainly has the following problems: (1) The active substances, the conductive agent, the binder and other multicomponent materials are easy to agglomerate or unevenly distributed in the dry mixing stage, so that the construction of a conductive network in the electrode is imperfect, and the performance (such as conductivity and capacity retention rate) of the electrode is reduced; (2) The traditional equipment is difficult to accurately regulate and control the degree and uniformity of the fibrosis of the adhesive, and the failure problems of electrode powder removal, cracking and the like are easily caused; (3) The connection among the working procedures is unsmooth, the production efficiency is low, the batch stability is poor, the requirement of large-scale production cannot be met, and the continuous production capacity is weak; (4) The consistency among various special equipment is insufficient, and accurate and controllable adjustment of the discharge particle size is difficult to realize in the crushing and shaping links, so that the consistency of the procedures such as subsequent rolling and tabletting is affected. Disclosure of Invention Based on the problems of poor material fiberization uniformity, difficulty in accurately regulating and controlling the fiberization degree and uniformity of the adhesive, insufficient continuous production capacity and low particle size regulation precision existing in the prior art by means of intermittent dry mixing production by means of various special equipment, the kneading internal mixer suitable for dry electrode preparation is provided. The technical scheme adopted by the invention is as follows: The powder treatment mechanism comprises a plurality of modules which are stacked in sequence and respectively provided with different treatment components, wherein the plurality of modules sequentially comprise a mixing module, a compaction module, a kneading module, a breaking module and a shaping module along a powder treatment path, the mixing module is configured to mix, disperse and output preliminarily mixed first mixed powder of preset multiple powder, the compaction module is configured to mechanically fuse and output uniformly coated second mixed powder, the kneading module is configured to knead and homogenize the second mixed powder and output a third mixed bulk body with a three-dimensional fiber network, the breaking module is configured to break the third mixed bulk body and output fourth mixed powder with a centimeter level and below particle size, and the shaping module is configured to shape the fourth mixed powder and output fifth mixed powder with a millimeter level and below particle size. Several modules are stacked in sequence in the vertical direction and are in controlled communication. Each module is provided with a feed inlet and a discharge outlet, and the discharge outlets of two adjacent modules are correspondingly overlapped with the feed inlet. The mixing device comprises a mixing module, a compaction module, a kneading module, a block breaking module, a mixing module, a first valve body capable of horizontally moving, and/or a second valve body capable of horizontally moving, and/or a third valve body capable of horizontally moving, which are arranged between the mixing module and the compaction module. The mixing module comprises a mixing cylinder body, a connecting shaft vertically and rotatably arranged in the mixing cylinder body and a mixing assembly sleeved on the connecting shaft, wherein the mixing assembly comprises dust raising paddles, shearing dispersing paddles and ox horn paddles which are arranged at intervals in an axial direction. The compaction module comprises a compaction cylinder body, a cutter body which is horizontally and rotatably arranged in the compaction cylinder body and a compaction assembly which is arranged on the cutter body, wherein the compaction