CN117101506A - Electrode material mixing process of soft-package battery - Google Patents

Electrode material mixing process of soft-package battery Download PDF

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Publication number
CN117101506A
CN117101506A CN202310977639.4A CN202310977639A CN117101506A CN 117101506 A CN117101506 A CN 117101506A CN 202310977639 A CN202310977639 A CN 202310977639A CN 117101506 A CN117101506 A CN 117101506A
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CN
China
Prior art keywords
screw
electrode mixture
mixing
fibrillated
primary
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Pending
Application number
CN202310977639.4A
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Chinese (zh)
Inventor
何明应
王腾飞
何小满
胡宿城
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Guangdong Jiashang New Energy Technology Co ltd
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Guangdong Jiashang New Energy Technology Co ltd
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Priority to CN202310977639.4A priority Critical patent/CN117101506A/en
Publication of CN117101506A publication Critical patent/CN117101506A/en
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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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/80—After-treatment of the mixture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/23—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis
    • B01F27/232—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes
    • B01F27/2322—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes with parallel axes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • B01F27/701—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers
    • B01F27/706—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers with all the shafts in the same receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/72—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices
    • B01F27/721—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices with two or more helices in the same receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/72—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices
    • B01F27/726—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices with two helices with opposite pitch on the same shaft; with two helices on the same axis, driven in opposite directions or at different speeds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/40—Mixers using gas or liquid agitation, e.g. with air supply tubes
    • B01F33/401—Methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/40—Mixers using gas or liquid agitation, e.g. with air supply tubes
    • B01F33/406—Mixers using gas or liquid agitation, e.g. with air supply tubes in receptacles with gas supply only at the bottom
    • B01F33/4061—Mixers using gas or liquid agitation, e.g. with air supply tubes in receptacles with gas supply only at the bottom through orifices arranged around a central cone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/40—Mixers using gas or liquid agitation, e.g. with air supply tubes
    • B01F33/409—Parts, e.g. diffusion elements; Accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/83—Mixing plants specially adapted for mixing in combination with disintegrating operations
    • B01F33/831—Devices with consecutive working receptacles, e.g. with two intermeshing tools in one of the receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
    • B01F33/8361—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating
    • B01F33/83612—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating by crushing or breaking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/181—Preventing generation of dust or dirt; Sieves; Filters
    • B01F35/184—Preventing generation of dust
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/181—Preventing generation of dust or dirt; Sieves; Filters
    • B01F35/187—Preventing generation of dust or dirt; Sieves; Filters using filters in mixers, e.g. during venting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/181—Preventing generation of dust or dirt; Sieves; Filters
    • B01F35/189—Venting, degassing or ventilating of gases, fumes or toxic vapours during mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/75—Discharge mechanisms
    • B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/20—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by expressing the material, e.g. through sieves and fragmenting the extruded length
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621—Binders
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers

Abstract

The invention relates to the technical field of battery production, in particular to an electrode material mixing process of a soft package battery, which comprises the following steps: s1, premixing electrode active particles and conductive agent particles, S2, mixing an active particle mixture and adhesive particles, S3, fibrillating the adhesive particles of the electrode mixture, S4, preheating and preserving heat of the primary fibrillated electrode mixture, and S5, continuously applying external force to squeeze the heated and preserved primary fibrillated electrode mixture. According to the invention, the electrode active particles and the conductive agent particles are dispersed and mixed to prepare an active particle mixture, then the active particle mixture and the adhesive particles are dispersed and mixed to prepare an electrode mixture, the adhesive particles of the electrode mixture are fibrillated, the primary fibrillated electrode mixture is preheated and kept warm, finally the primary fibrillated electrode mixture is extruded by continuously applying external force to prepare the fibrillated electrode mixture, and the whole mixing and processing production process is solvent-free, so that the production of the pole piece is simpler and more environment-friendly.

Description

Electrode material mixing process of soft-package battery
Technical Field
The invention relates to the technical field of battery production, in particular to an electrode material mixing process of a soft package battery.
Background
Lithium batteries are a type of battery using a nonaqueous electrolyte solution with lithium metal or a lithium alloy as a positive/negative electrode material. The battery is used as an energy source, the current which has stable voltage, stable current, long-time stable power supply and little influence from the outside can be obtained, the battery has simple structure, convenient carrying, simple and easy charging and discharging operation, is not influenced by the outside climate and temperature, has stable and reliable performance, and plays a great role in various aspects in the life of the modern society.
The pole piece production is a front section link of the battery core manufacture of the battery, plays a decisive role on the basic performance of the battery core, is a primary link of the battery core manufacture, and mainly comprises four steps of slurry stirring, pole piece coating, pole piece rolling and pole piece cutting. The slurry is stirred, positive/negative electrode active materials, conductive agents and adhesives are uniformly dispersed in a solvent according to a proportion and stirred, so that stable slurry with certain viscosity is formed. The solvent needs to be recovered during the coating and drying process. As more gaps are reserved between the active substance and the conductive agent after the solvent is evaporated, the compaction density of the material is not high due to the gaps, and the density and the electrical property of the pole piece are affected. In the traditional wet process, NMP (N-methyl pyrrolidone) solvent is used, and the solvent is toxic and not friendly to the environment. There is a need for improvement.
Disclosure of Invention
Aiming at the defect that toxic solvents are needed in the wet pole piece manufacturing process in the prior art, the invention provides a soft-package battery electrode material mixing process, active particles and conductive agent particles are dispersed and mixed to prepare an active particle mixture, the active particle mixture and adhesive particles are dispersed and mixed to prepare an electrode mixture, the adhesive particles of the electrode mixture are fibrillated and dispersed, the primary fibrillated electrode mixture is preheated and kept warm, and the heated and kept warm primary fibrillated electrode mixture is extruded by continuously applying external force to prepare the fibrillated electrode mixture, so that the whole mixing and processing production process is solvent-free, and the pole piece production is simpler and more environment-friendly. Meanwhile, the problems that after the solvent is evaporated in the traditional wet pole piece manufacturing process, more gaps are reserved between the active substance and the conductive agent, the compaction density of the material is low due to the gaps, and the density and the electrical performance of the pole piece are affected are solved.
In order to achieve the above object, the electrode material mixing process of the soft package battery of the present invention comprises the following steps:
s1, premixing electrode active particles and conductive agent particles, wherein an even blanking device is arranged at the top of an airflow mixer, the electrode active particles and the conductive agent particles weighed by a weighing hopper are respectively led into the airflow mixer through the even blanking device, the airflow mixer is conical, the even blanking device is arranged at one side of the top of the airflow mixer and is communicated with the interior of the airflow mixer, a first exhaust filter is arranged at the other side of the top of the airflow mixer, a plurality of air nozzles distributed in a ring shape are arranged at the lower part of the airflow mixer, and compressed inert gas or dry air is sprayed out through the air nozzles to disperse and mix the electrode active particles and the conductive agent particles to prepare an active particle mixture;
s2, mixing the active particle mixture with the adhesive particles, introducing the adhesive particles weighed by a weighing hopper into an airflow mixer through a uniform feeder, and dispersing and mixing the active particle mixture and the adhesive particles by spraying compressed inert gas or dry air through an air nozzle to prepare an electrode mixture;
s3, fibrillating and dispersing binder particles of the electrode mixture, introducing the electrode mixture into a jet mill through a pipeline for crushing, and crushing, dispersing and mixing the electrode active particles, the conductive agent particles and the binder particles to prepare a primary fibrillated electrode mixture;
s4, preheating and preserving heat of the primary fibrillated electrode mixture, and guiding the primary fibrillated electrode mixture into a heating and preserving box, wherein the primary fibrillated electrode mixture is preserved after being heated in the heating and preserving box, and the heating and preserving temperature is 150-300 ℃;
and S5, continuously applying external force to extrude the heated and heat-preserving primary fibrillated electrode mixture, introducing the heated and heat-preserving primary fibrillated electrode mixture into a screw groove of a screw extruder, and continuously compacting, stirring and mixing the primary fibrillated electrode mixture on the inner wall of the screw groove and the surface of the screw under the rotation action of the screw to prepare the fibrillated electrode mixture.
Preferably, in the step S1, the pressure of the compressed inert gas or the dry air is 0.6-1.3MPa, the mixing time is 5-7 minutes, the total loading of the mixing part is 1, and the total amount of the active particle mixture is 0.8-0.9.
Preferably, in the step S2, the total mass of the electrode mixture is 100wt%, the electrode active particles are 90 to 98wt%, the conductive agent particles are 1 to 5wt%, and the binder particles are 1 to 5wt%.
Preferably, in the step S3, the air inlet pressure of the jet mill is 0.3 Mpa-1.5 Mpa, the rotating speed of a classifying turbine in the jet mill is 300-650rpm/min, the pulverizing time of the jet mill is 3-15 minutes, and the sieving mesh number of the primary fibrillated electrode mixture is 60-200 meshes.
Preferably, the inner wall of the top of the air flow mixer is provided with a labyrinth exhaust duct, one end of the labyrinth exhaust duct is connected with the first exhaust filter, the other end of the labyrinth exhaust duct is connected with the inside of the air flow mixer, and the top of the air flow mixer is also provided with a second exhaust filter;
the air flow mixer is divided into a mixing part and a separation part, the separation part is arranged above the mixing part, the air nozzle is arranged on the mixing part, the uniform blanking device, the first exhaust filter, the labyrinth exhaust duct and the second exhaust filter are all arranged on the separation part, and the height of the separation part is larger than or equal to that of the mixing part.
Preferably, the even blanking device comprises a blanking pipe, a first perforated plate, a second perforated plate and a push-pull cylinder, wherein the blanking pipe is connected with the airflow mixer, the first perforated plate is horizontally fixed inside the blanking pipe, the second perforated plate is horizontally and slidably connected with the blanking pipe and is overlapped above the first perforated plate, the push-pull cylinder drives the second perforated plate to horizontally slide with the blanking pipe, and holes of the first perforated plate and the second perforated plate are arranged in a staggered mode.
Preferably, the screw groove of the screw extruder comprises a first screw groove and a second screw groove, the first screw groove and the second screw groove are connected end to end, and the first screw groove is arranged above the second screw groove; the screw rod of the screw extruder comprises a double-rod screw rod arranged in the first screw groove and a single-rod screw rod arranged in the second screw groove, wherein the double-rod screw rod and the single-rod screw rod comprise a first part screw sleeve, a second part screw sleeve and a third part screw sleeve, the thread interval of the first part screw sleeve is larger than the thread interval of the third part screw sleeve, the thread interval of the second part screw sleeve is larger than the thread interval of the first part screw sleeve, the rotating speed of the double-rod screw rod and the single-rod screw rod is lower than 650 revolutions per minute, and the working temperature of the double-rod screw rod and the single-rod screw rod is 160 ℃ -350 ℃.
Preferably, a mixed thread piece is arranged between the first part screw sleeve and the second part screw sleeve, a plurality of grooves are formed in the screw edges of the mixed thread piece, the directions of the grooves are opposite to the rotating direction of the screw, and when the mixed thread piece conveys the primary fibrillated electrode mixture, the primary fibrillated electrode mixture partially leaks from the grooves, so that the primary fibrillated electrode mixture between the first part screw sleeve and the second part screw sleeve is fully mixed and exchanged, and the distribution and mixing effect of the primary fibrillated electrode mixture is enhanced.
Preferably, a stretching type screw member is arranged between the second part screw sleeve and the third part screw sleeve, the stretching type screw member comprises a positive screw thread and a reverse screw thread, the positive screw thread and the reverse screw thread are oppositely arranged, the leads of the positive screw thread and the reverse screw thread are larger than or equal to the length of the stretching type screw member, the two stretching type screw members are meshed with each other to stretch the primary fibrillated electrode mixture, so that the adhesive particles are fibrillated, the dispersing effect is enhanced, the shearing heat is relatively less, and the temperature control is convenient.
Preferably, the tail end of the twin-screw is provided with a tooth-shaped screw group and is positioned at the joint of the first screw groove and the second screw groove, the tooth-shaped screw group comprises a plurality of straight tooth-shaped screws and a plurality of helical tooth-shaped screws, the straight tooth-shaped screws and the helical tooth-shaped screws are arranged adjacently at intervals, the two tooth-shaped screw groups are arranged in a staggered manner, and the axial conveying of the primary fibrillating electrode mixture is stopped through the straight tooth-shaped screws and the helical tooth-shaped screws, so that the primary fibrillating electrode mixture in the first screw groove enters the second screw groove, and the tooth-shaped screw group slides in the first screw groove to improve the self-cleaning property of the inside of the first screw groove.
The invention has the beneficial effects that: according to the invention, the electrode active particles and the conductive agent particles are dispersed and mixed to prepare the active particle mixture, the active particle mixture and the adhesive particles are dispersed and mixed to prepare the electrode mixture, the adhesive particles of the electrode mixture are fibrillated and dispersed, the primary fibrillated electrode mixture is preheated and insulated, the heated and insulated primary fibrillated electrode mixture is extruded by continuously applying external force to prepare the fibrillated electrode mixture, and the whole mixing and processing production process is solvent-free, so that the production of the pole piece is simpler and more environment-friendly. Meanwhile, the problems that after the solvent is evaporated in the traditional wet pole piece manufacturing process, more gaps are reserved between the active substance and the conductive agent, the compaction density of the material is low due to the gaps, and the density and the electrical performance of the pole piece are affected are solved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of the air flow mixer of the present invention.
Fig. 3 is a schematic structural view of the uniform blanking device of the present invention.
Fig. 4 is a schematic structural view of the screw extruder of the present invention.
Fig. 5 is a schematic structural view of the twin-screw and the single-screw of the present invention.
Fig. 6 is a schematic structural view of a hybrid screw according to the present invention.
Fig. 7 is a schematic structural view of the tensile screw of the present invention.
Fig. 8 is a schematic structural view of a tooth screw set according to the present invention.
The reference numerals include:
1. uniformly blanking; 11. discharging pipes; 12. a first perforated plate; 13. a second perforated plate; 14. a push-pull cylinder; 2. an air flow mixer; 21. a mixing section; 22. an isolation part; 23. a particle catcher; 231. an inclined portion; 232. a bending part; 233. regulating and controlling an air nozzle; 3. a first exhaust gas filter; 31. an air blowing pipe; 4. an air nozzle; 5. an air flow pulverizer; 6. an insulation box; 7. a screw extruder; 8. a screw groove; 81. a first screw groove; 82. a second screw groove; 9. a screw; 91. a double-rod screw; 92. a single rod screw; 93. a first partial sleeve; 94. a second partial sleeve; 95. a third partial sleeve; 96. a hybrid screw; 961. a groove; 97. a tensile screw; 971. a positive thread; 972. a reverse thread; 973. a main body; 974. a first twist; 975. a second twisted portion; 98. a set of tooth screws; 981. a straight-tooth screw; 982. a helical thread; 10. a labyrinth exhaust duct; 101. and a second exhaust filter.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 8, the electrode material mixing process of the soft pack battery of the present invention comprises the steps of:
s1, electrode active particles and conductive agent particles are premixed, a uniform blanking device 1 is arranged at the top of an airflow mixer 2, the electrode active particles and the conductive agent particles weighed through a weighing hopper are respectively led into the airflow mixer 2 through the uniform blanking device 1, the airflow mixer 2 is conical, the uniform blanking device 1 is arranged at one side of the top of the airflow mixer 2 and is communicated with the interior of the airflow mixer 2, a first exhaust filter 3 is arranged at the other side of the top of the airflow mixer 2, the first exhaust filter 3 is used for filtering and exhausting the airflow mixer 2, a plurality of annularly distributed air nozzles 4 are arranged at the lower part of the airflow mixer 2, compressed inert gas or dry air is sprayed out through the air nozzles 4 to disperse and mix the electrode active particles and the conductive agent particles to prepare an active particle mixture, wherein the pressure of the compressed inert gas or the dry air is 0.6-1.3MPa, and the mixing time is 5-7 minutes, so that the electrode active particles and the conductive agent particles are dispersed and mixed to prepare the active particle mixture. For example, the pressure of the compressed inert gas or the dry air is 0.6MPa, and the mixing time is 7 minutes; the pressure of the compressed inert gas or the dry air is 0.7MPa, and the mixing time is 6 minutes and 30 seconds; the pressure of the compressed inert gas or the dry air is 0.8MPa, and the mixing time is 6 minutes; the pressure of the compressed inert gas or the dry air is 0.9MPa, and the mixing time is 5 minutes and 30 seconds; the compressed inert gas or dry air pressure was 1.1MPa and the mixing time was 5 minutes to accommodate the active particle mixtures of different particle sizes.
The total loading of the mixing section 21 is 1, and the total amount of the active particle mixture is 0.8 to 0.9, thereby reducing the loss of the mixed active particle mixture. For example, the total amount of active particle mixture is 0.8, the total amount of active particle mixture is 0.85, and the total amount of active particle mixture is 0.9. The compressed inert gas may be, for example, dry nitrogen, dry argon, to facilitate control of the water content of the active particle mixture. Air, nitrogen, argon heated to a certain temperature, e.g. 70 c nitrogen, 85 c argon, may also be included.
In practical use, the electrode active particles include positive electrode active particles and negative electrode active particles. Positive electrode active particulate matter includes, but is not limited to: at least one of lithium cobaltate, lithium manganate, lithium nickelate, ternary lithium nickel cobalt manganate and lithium iron phosphate, that is, the positive electrode active particulate matter may be a mixture of two or more of them.
Negative electrode active particulate matter includes, but is not limited to: at least one of graphite, silicon oxide, lithium silicon alloy, and lithium powder, that is, the anode active particulate matter may be a mixture of two or more thereof.
Conductive agent particles include, but are not limited to: at least one of graphite, conductive carbon black, ketjen black, acetylene black, graphene, carbon fiber and carbon nanotube, and the conductive agent may be a mixture of two or more thereof.
S2, mixing the active particle mixture with the adhesive particles, introducing the adhesive particles weighed by a weighing hopper into an airflow mixer 2 through a uniform feeder 1, and dispersing and mixing the active particle mixture and the adhesive particles by spraying compressed inert gas or dry air through an air nozzle 4 to prepare an electrode mixture; wherein the total mass of the electrode mixture is 100wt%, the electrode active particles are 90-98 wt%, the conductive agent particles are 1-5 wt%, and the adhesive particles are 1-5 wt%. For example, the total mass of the electrode mixture is 98wt% of the electrode active particles, 1wt% of the conductive agent particles, and 1wt% of the binder particles; the total mass of the electrode mixture was 97wt% of electrode active particles, 1.5wt% of conductive agent particles, and 1.5wt% of binder particles; the total mass of the electrode mixture was 100wt%, the electrode active particles were 96wt%, the conductive agent particles were 2wt%, and the binder particles were 2wt%; the total mass of the electrode mixture was 95wt% of electrode active particles, 3wt% of conductive agent particles, and 2wt% of binder particles; the total mass of the electrode mixture was 94wt% of electrode active particles, 4wt% of conductive agent particles and 2wt% of binder particles, based on 100 wt%.
Binder particles include, but are not limited to: at least one of polyvinylidene fluoride, sodium polyacrylate, polytetrafluoroethylene, polyimide, polyethylene glycol, polyacrylonitrile, sodium carboxymethyl cellulose and styrene butadiene rubber, i.e. the binder may be a mixture of two or more thereof.
In the step S2, the active particle mixture and the binder particles are dispersed and mixed to prepare the electrode mixture, wherein the pressure of the compressed inert gas or the dry air is 0.6-1.3MPa, and the mixing time is 5-7 minutes. For example, the pressure of the compressed inert gas or the dry air is 0.6MPa, and the mixing time is 7 minutes; the pressure of the compressed inert gas or the dry air is 0.7MPa, and the mixing time is 6 minutes and 30 seconds; the pressure of the compressed inert gas or the dry air is 0.8MPa, and the mixing time is 6 minutes; the pressure of the compressed inert gas or the dry air is 0.9MPa, and the mixing time is 5 minutes and 30 seconds; the pressure of the compressed inert gas or the dry air is 1.1MPa, and the mixing time is 5 minutes, so as to adapt to the adhesive particles with different particle sizes.
S3, fibrillating and dispersing binder particles of the electrode mixture, introducing the electrode mixture into a jet mill 5 through a pipeline for crushing, and crushing, dispersing and mixing electrode active particles, conductive agent particles and binder particles to prepare a primary fibrillated electrode mixture; wherein, the air inlet pressure of the jet mill 5 is 0.3 Mpa-1.5 Mpa, the rotational speed of a classifying turbine in the jet mill 5 is 300-650rpm/min, and the pulverizing time of the jet mill 5 is 3-15 minutes, so that the electrode active particles, the conductive agent particles and the adhesive particles are pulverized and dispersed and mixed to prepare the primary fibrillated electrode mixture. If the granularity of the electrode mixture is less than 3mm, the air inlet pressure of the jet mill 5 is 0.6Mpa, the rotating speed of a classifying turbine in the jet mill 5 is 330rpm/min, and the pulverizing time of the jet mill 5 is 8 minutes; the particle size of the electrode mixture is less than 3mm, the air inlet pressure of the jet mill 5 is 0.7Mpa, the rotating speed of the classifying turbine in the jet mill 5 is 400rpm/min, and the pulverizing time of the jet mill 5 is 7 minutes, so as to adapt to the electrode mixtures with different particle sizes.
If the granularity of the electrode mixture is less than 3mm, the air inlet pressure of the jet mill 5 is 0.8Mpa, the rotating speed of a classifying turbine in the jet mill 5 is 450rpm/min, and the pulverizing time of the jet mill 5 is 6 minutes;
the screened mesh number of the primary fibrillated electrode mixture is 60-200 mesh, e.g. 80 mesh, 100 mesh, 120 mesh, 150 mesh, 170 mesh, 180 mesh.
S4, preheating and preserving heat of the primary fibrillated electrode mixture, introducing the primary fibrillated electrode mixture into a heating and preserving box 6, and preserving heat of the primary fibrillated electrode mixture after heating the primary fibrillated electrode mixture in the heating and preserving box 6, wherein the heating and preserving temperature is 150-300 ℃, so that the primary fibrillated electrode mixture is preheated, and the primary fibrillated electrode mixture is convenient for processing in one step, such as 150 ℃, 190 ℃, 200 ℃, 230 ℃, 250 ℃, 260 ℃, 270 ℃, 280 ℃, 290 ℃ and 300 ℃. For example, the adhesive particles are polytetrafluoroethylene, and the heating and heat preservation temperature is 260 ℃, 270 ℃, 280 ℃ or 290 ℃, so that the adhesive particles are in a softened state, and the fibrillation treatment of the adhesive particles is facilitated.
S5, continuously applying external force to extrude the heated and heat-preserving primary fibrillated electrode mixture, guiding the heated and heat-preserving primary fibrillated electrode mixture into a screw groove 8 of a screw extruder 7, continuously compacting, stirring and mixing the primary fibrillated electrode mixture on the inner wall of the screw groove 8 and the surface of the screw 9 under the rotation action of the screw 9 to prepare the fibrillated electrode mixture, and rolling the fibrillated electrode mixture by a roll squeezer to prepare the pole piece, wherein the whole mixed processing production process is solvent-free, so that the pole piece production is simpler and more environment-friendly. Meanwhile, the problems that after the solvent is evaporated in the traditional wet pole piece manufacturing process, more gaps are reserved between the active substance and the conductive agent, the compaction density of the material is low due to the gaps, and the density and the electrical performance of the pole piece are affected are solved.
The top inner wall of the airflow mixer 2 of the present embodiment is provided with a labyrinth exhaust duct 10, and the labyrinth exhaust duct 10 is in a swirl shape, a return shape and an arcuate shape. The present embodiment is exemplified by a swirl type. One end of the labyrinth exhaust duct 10 is connected with the first exhaust filter 3, the other end of the labyrinth exhaust duct 10 is connected with the interior of the airflow mixer 2, the exhaust path of the airflow mixer 2 is prolonged through the labyrinth exhaust duct 10, the loss of mixed active particle mixture is reduced, the top of the airflow mixer 2 is also provided with a second exhaust filter 101, and the second exhaust filter 101 is also used for filtering and exhausting the airflow mixer 2. The connection of the labyrinth exhaust duct 10 and the first exhaust filter 3 is provided with an air blowing pipe 31, and when the air blowing pipe 31 blows air into the labyrinth exhaust duct 10, the second exhaust filter 101 is used for exhausting air, so that the active particle mixture in the labyrinth exhaust duct 10 returns into the airflow mixer 2, and the loss of the mixed active particle mixture is reduced.
The airflow mixer 2 is divided into a mixing part 21 and a separation part 22, the separation part 22 is arranged above the mixing part 21, the air nozzle 4 is arranged on the mixing part 21, the uniform blanking device 1, the first exhaust filter 3, the labyrinth exhaust duct 10 and the second exhaust filter 101 are all arranged on the separation part 22, the height of the separation part 22 is larger than or equal to that of the mixing part 21, specifically, the height ratio of the height of the separation part 22 to that of the mixing part 21 is 1.3:1, the distance between the labyrinth exhaust duct 10 and the mixing part 21 is increased, the active particle mixture is prevented from entering the labyrinth exhaust duct 10, and the loss of the mixed active particle mixture is reduced.
In actual use, the isolation portion 22 is provided with a plurality of particle traps 23, and the particle traps are vertically and alternately arranged, each particle trap comprises an inclined portion 231 and a bending portion 232 arranged at the top of the inclined portion 231, an arc-shaped surface is arranged on the inner side of the bending portion 232, the arc-shaped surface faces the mixing portion 21, and active particle mixtures are captured through the inclined portion 231, the bending portion 232 and the arc-shaped surface.
A regulating air nozzle 233 is arranged between the gaps of the two bending parts, the air outlet of the regulating air nozzle 233 faces the mixing part 21, and compressed inert gas or dry air with the pressure of 0.1MPa is blown out by the regulating air nozzle 233, so that active particles are prevented from being mixed and entering the labyrinth exhaust duct 10. Specifically, for example, after the air nozzle 4 is mixed and operated for 1 minute, the air nozzle 233 is controlled to start to operate, and air is blown for 5 seconds every 20 seconds.
The uniform blanking device 1 of this embodiment includes blanking tube 11, first perforated plate 12, second perforated plate 13 and push-pull cylinder 14, blanking tube 11 is connected with air current blender 2, first perforated plate 12 is fixed in the blanking tube 11 is inside, second perforated plate 13 and blanking tube 11 horizontal sliding connection and fold and set up in first perforated plate 12 top, push-pull cylinder 14 drive second perforated plate 13 and blanking tube 11 horizontal sliding, the hole dislocation set of first perforated plate 12 and second perforated plate 13, during the use, push-pull cylinder 14 drive second perforated plate 13 and blanking tube 11 horizontal sliding make the hole of first perforated plate 12 and second perforated plate 13 overlap, the material of being convenient for gets into air current blender 2, prevent the material agglomeration.
The screw groove 8 of the screw extruder 7 of the present embodiment includes a first screw groove 81 and a second screw groove 82, the first screw groove 81 and the second screw groove 82 are connected end to end, and the first screw groove 81 is disposed above the second screw groove 82; the screw 9 of the screw extruder 7 comprises a double-rod screw 91 arranged in the first screw groove 81 and a single-rod screw 92 arranged in the second screw groove 82, wherein the double-rod screw 91 and the single-rod screw 92 comprise a first part screw sleeve 93, a second part screw sleeve 94 and a third part screw sleeve 95, the thread pitch of the first part screw sleeve 93 is greater than the thread pitch of the third part screw sleeve 95, the thread pitch of the second part screw sleeve 94 is greater than the thread pitch of the first part screw sleeve 93, the conveying capacity of the third part screw sleeve 95 is lower than that of the first part screw sleeve 93, the conveying speed of the primary fibrillated electrode mixture can be slowed down, the conveying capacity of the second part screw sleeve 94 is lowest, and the primary fibrillated electrode mixture is fully mixed, extruded and sheared. The rotational speeds of the double-rod screw 91 and the single-rod screw 92 are lower than 650rpm, for example, the rotational speeds of the double-rod screw 91 and the single-rod screw 92 are 400 rpm; the rotational speeds of the double-rod screw 91 and the single-rod screw 92 are 500 revolutions per minute; the rotation speed of the double-rod screw 91 is 400rpm, and the rotation speed of the single-rod screw 92 is 450 rpm. The operating temperatures of the twin-screw 91 and the single-screw 92 are 160 to 350 c, for example, 180 c, 200 c, 270 c, 300 c, 320 c for both the twin-screw 91 and the single-screw 92.
In this embodiment, a mixed screw member 96 is disposed between the first part screw sleeve 93 and the second part screw sleeve 94, a plurality of grooves 961 are disposed on the screw edges of the mixed screw member 96, the directions of the grooves 961 are opposite to the rotating direction of the screw 9, and when the mixed screw member 96 conveys the primary fibrillated electrode mixture, the primary fibrillated electrode mixture partially leaks from the grooves 961, so that the primary fibrillated electrode mixture between the first part screw sleeve 93 and the second part screw sleeve 94 is fully mixed and exchanged, and the distribution and mixing effects of the primary fibrillated electrode mixture are enhanced.
A tensile screw member 97 is provided between the second portion insert 94 and the third portion insert 95 in this embodiment, the tensile screw member 97 includes a positive screw 971 and a negative screw 972, and the cross sections of the positive screw 971 and the negative screw 972 are diamond-shaped. The positive thread 971 and the negative thread 972 each include a main body 973, a first twisted portion 974 and a second twisted portion 975, the first twisted portion 974 is opposite to the second twisted portion 975 in twisting direction, the positive thread 971 and the negative thread 972 are oppositely disposed, the two first twisted portions 974 are connected to form a first V-shaped thread, the two second twisted portions 975 are connected to form a second V-shaped thread, and the primary fibrillated electrode mixture is stretched by the first V-shaped thread and the second V-shaped thread to fibrillate the adhesive particles. And the leads of the positive thread 971 and the reverse thread 972 are equal to or greater than the length of the stretching type screw 97, the two stretching type screw 97 are meshed with each other to stretch the primary fibrillated electrode mixture, so that the adhesive particles are fibrillated, the dispersing effect is enhanced, the shearing heat is relatively less, and the temperature control is convenient.
The tail end of the double-rod screw 91 of the present embodiment is provided with a tooth-shaped screw group 98 and is located at the junction of the first screw groove 81 and the second screw groove 82, the tooth-shaped screw group 98 includes a plurality of straight tooth-shaped screws 981 and a plurality of helical tooth-shaped screws 982, the straight tooth-shaped screws 981 are provided with straight tooth grooves, and the helical tooth-shaped screws 982 are provided with helical tooth grooves. The straight-tooth screw 981 and the helical screw 982 are disposed adjacently at intervals, the two-tooth screw groups 98 are disposed alternately, and the axial feeding of the primary fibrillated electrode mixture is stopped by the straight-tooth screw 981 and the helical screw 982, so that the primary fibrillated electrode mixture in the first screw groove 81 enters the second screw groove 82, and the tooth screw groups 98 slide in the first screw groove 81 to improve self-cleaning property in the first screw groove 81.
The foregoing is merely exemplary of the present invention, and those skilled in the art should not be considered as limiting the invention, since modifications may be made in the specific embodiments and application scope of the invention in light of the teachings of the present invention.

Claims (10)

1. The electrode material mixing process of the soft package battery is characterized by comprising the following steps of:
the method comprises the following steps:
s1, premixing electrode active particles and conductive agent particles, wherein an even blanking device (1) is arranged at the top of an airflow mixer (2), the electrode active particles and the conductive agent particles weighed through a weighing hopper are respectively led into the airflow mixer (2) through the even blanking device (1), the airflow mixer (2) is conical, the even blanking device (1) is arranged at one side of the top of the airflow mixer (2) and is communicated with the interior of the airflow mixer (2), a first exhaust filter (3) is arranged at the other side of the top of the airflow mixer (2), a plurality of air nozzles (4) distributed in a ring shape are arranged at the lower part of the airflow mixer (2), and compressed inert gas or dry air is sprayed out through the air nozzles (4) to disperse and mix the electrode active particles and the conductive agent particles to prepare an active particle mixture;
s2, mixing the active particle mixture with the adhesive particles, introducing the adhesive particles weighed by a weighing hopper into an airflow mixer (2) through a uniform feeder (1), and dispersing and mixing the active particle mixture and the adhesive particles by spraying compressed inert gas or dry air through an air nozzle (4) to prepare an electrode mixture;
s3, fibrillating and dispersing binder particles of the electrode mixture, guiding the electrode mixture into a jet mill (5) through a pipeline for crushing, and crushing, dispersing and mixing the electrode active particles, the conductive agent particles and the binder particles to prepare a primary fibrillated electrode mixture;
s4, preheating and preserving heat of the primary fibrillated electrode mixture, and guiding the primary fibrillated electrode mixture into a heating insulation box (6), wherein the primary fibrillated electrode mixture is heated in the heating insulation box (6) and then preserved at the temperature of 150-300 ℃;
and S5, continuously applying external force to squeeze the heated and heat-preserving primary fibrillated electrode mixture, introducing the heated and heat-preserving primary fibrillated electrode mixture into a screw groove (8) of a screw extruder (7), and continuously compacting, stirring and mixing the primary fibrillated electrode mixture on the inner wall of the screw groove (8) and the surface of the screw (9) under the rotation action of the screw (9) to prepare the fibrillated electrode mixture.
2. The process for mixing electrode materials of a soft pack battery according to claim 1, wherein: in the step S1, the pressure of the compressed inert gas or the dry air is 0.6-1.3MPa, the mixing time is 5-7 minutes, the total loading capacity of the mixing part (21) is 1, and the total amount of the active particle mixture is 0.8-0.9.
3. The process for mixing electrode materials of a soft pack battery according to claim 1, wherein: wherein in the step S2, the total mass of the electrode mixture is 100wt%, the electrode active particles are 90-98 wt%, the conductive agent particles are 1-5 wt%, and the adhesive particles are 1-5 wt%.
4. The process for mixing electrode materials of a soft pack battery according to claim 1, wherein: wherein in the step S3, the air inlet pressure of the jet mill (5) is 0.3 Mpa-1.5 Mpa, the rotating speed of a classifying turbine in the jet mill (5) is 300-650rpm/min, the pulverizing time of the jet mill (5) is 3-15 minutes, and the number of the screened screen meshes of the primary fibrillated electrode mixture is 60-200 meshes.
5. The process for mixing electrode materials of a soft pack battery according to claim 1, wherein: the inner wall of the top of the airflow mixer (2) is provided with a labyrinth type exhaust duct (10), one end of the labyrinth type exhaust duct (10) is connected with the first exhaust filter (3), the other end of the labyrinth type exhaust duct (10) is connected with the inside of the airflow mixer (2), and the top of the airflow mixer (2) is also provided with a second exhaust filter (101);
the airflow mixer (2) is divided into a mixing part (21) and a separation part (22), the separation part (22) is arranged above the mixing part (21), the air nozzle (4) is arranged on the mixing part (21), the uniform blanking device (1), the first exhaust filter (3), the labyrinth exhaust duct (10) and the second exhaust filter (101) are all arranged on the separation part (22), and the height of the separation part (22) is larger than or equal to that of the mixing part (21).
6. The process for mixing electrode materials of a soft pack battery according to claim 1, wherein: the uniform blanking device (1) comprises a blanking pipe (11), a first perforated plate (12), a second perforated plate (13) and a push-pull cylinder (14), wherein the blanking pipe (11) is connected with the airflow mixer (2), the first perforated plate (12) is horizontally fixed inside the blanking pipe (11), the second perforated plate (13) is horizontally and slidingly connected with the blanking pipe (11) and is overlapped above the first perforated plate (12), and the push-pull cylinder (14) drives the second perforated plate (13) to horizontally slide with the blanking pipe (11), so that holes of the first perforated plate (12) and the second perforated plate (13) are arranged in a staggered mode.
7. The process for mixing electrode materials of a soft pack battery according to claim 1, wherein: the screw groove (8) of the screw extruder (7) comprises a first screw groove (81) and a second screw groove (82), the first screw groove (81) and the second screw groove (82) are connected end to end, and the first screw groove (81) is arranged above the second screw groove (82); screw rod (9) of screw extruder (7) are including setting up twin-screw (91) in first helicla flute (81) and setting up single-screw (92) in second helicla flute (82), twin-screw (91) and single-screw (92) all include first part swivel nut (93), second part swivel nut (94) and third part swivel nut (95), the screw pitch of first part swivel nut (93) is the screw pitch of third part swivel nut (95) is the screw pitch of second part swivel nut (94), the rotational speed of twin-screw (91) and single-screw (92) is less than 650 revolutions per minute, the operating temperature of twin-screw (91) and single-screw (92) is 160-350 ℃.
8. The process for mixing electrode materials of a soft pack battery according to claim 7, wherein: a mixed thread piece (96) is arranged between the first part screw sleeve (93) and the second part screw sleeve (94), a plurality of grooves (961) are formed in the screw edges of the mixed thread piece (96), the directions of the grooves (961) are opposite to the rotating directions of the screw rods (9), and when the mixed thread piece (96) conveys primary fibrillated electrode mixture, the primary fibrillated electrode mixture partially leaks from the grooves (961), so that the primary fibrillated electrode mixture between the first part screw sleeve (93) and the second part screw sleeve (94) is fully mixed and exchanged, and the primary fibrillated electrode mixture distribution and mixing effect is enhanced.
9. The process for mixing electrode materials of a soft pack battery according to claim 7, wherein: a stretching type screw member (97) is arranged between the second part screw sleeve (94) and the third part screw sleeve (95), the stretching type screw member (97) comprises a positive screw thread (971) and a reverse screw thread (972), the positive screw thread (971) and the reverse screw thread (972) are oppositely arranged, the leads of the positive screw thread (971) and the reverse screw thread (972) are not less than the length of the stretching type screw member (97), the two stretching type screw members (97) are meshed with each other to stretch a primary fibrillating electrode mixture, so that adhesive particles are fibrillated, the dispersing effect is enhanced, the shearing heat is relatively less, and the temperature control is facilitated.
10. The process for mixing electrode materials of a soft pack battery according to claim 7, wherein: the tail end of the double-rod screw (91) is provided with a tooth-shaped screw member group (98) and is positioned at the joint of the first screw groove (81) and the second screw groove (82), the tooth-shaped screw member group (98) comprises a plurality of straight tooth-shaped screw members (981) and a plurality of inclined tooth-shaped screw members (982), the straight tooth-shaped screw members (981) and the inclined tooth-shaped screw members (982) are arranged adjacently at intervals, the two tooth-shaped screw member groups (98) are arranged in a staggered mode, and the axial conveying of the primary fibrillated electrode mixture is stopped through the straight tooth-shaped screw members (981) and the inclined tooth-shaped screw members (982), so that the primary fibrillated electrode mixture in the first screw groove (81) enters the second screw groove (82), and the tooth-shaped screw member group (98) slides in the first screw groove (81) to improve the self-cleaning property of the interior of the first screw groove (81).
CN202310977639.4A 2023-08-03 2023-08-03 Electrode material mixing process of soft-package battery Pending CN117101506A (en)

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