CN111744626B

CN111744626B - Preparation equipment of lithium ion battery cathode silicon-carbon composite material

Info

Publication number: CN111744626B
Application number: CN202010649323.9A
Authority: CN
Inventors: 李伟力; 小泽康典; 李埃荣; 王新龙
Original assignee: Ningbo Innovation Energy Research Institute Co ltd
Current assignee: Ningbo Innovation Energy Research Institute Co ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2022-12-23
Anticipated expiration: 2040-07-07
Also published as: CN111744626A

Abstract

The invention discloses preparation equipment of a lithium ion battery cathode silicon-carbon composite material, and relates to the technical field of battery manufacturing. This lithium ion battery negative pole silicon carbon composite's preparation equipment, which comprises a bod, the bottom welding of organism has the base, and the top welding of organism has the barrel, and the inner wall top fixed mounting of barrel has driving motor, and driving motor's output shaft passes through shaft coupling fixed connection with the top of actuating lever, and the silo has been seted up at the top of organism, and the bottom fixed mounting of actuating lever has ball protection mechanism. The preparation equipment for the lithium ion battery cathode silicon-carbon composite material is based on the matching operation of the grinding ball protection mechanism and the attached powder scraping mechanism, the high temperature generated in the working process of a grinding ball can be effectively reduced, and meanwhile, when the static charges carried on the surface of the grinding ball are eliminated by the grinding ball protection mechanism, the attached powder scraping mechanism operates synchronously, and continuous and intermittent separation can be formed between the powder and the grinding ball.

Description

Preparation equipment of lithium ion battery cathode silicon-carbon composite material

Technical Field

The invention relates to the technical field of battery manufacturing, in particular to a preparation device of a lithium ion battery cathode silicon-carbon composite material.

Background

The lithium ion battery has the advantages of high specific energy, good safety, small environmental pollution and the like, and has wide application prospect in various portable electronic equipment, electric automobiles and other aspects. In recent years, with the increase of the demand for high-energy power supplies, a great deal of research is carried out on how to develop a high-energy-density, rapid and high-power charging and discharging lithium ion battery, and experiments show that the composite material prepared by combining silicon and a carbon material can effectively improve the electrical property of the lithium ion battery. In most processes for preparing silicon-carbon composite materials by thermal decomposition or chemical vapor deposition, the composition, microstructure and uniformity are difficult to control, compared with the ball milling method, the method can effectively control the parameters of the composite materials.

However, in actual production and processing activities, the processing quality of the ball milling method has a high requirement on the heat dissipation effect, and the processing characteristics of the ball milling method are that the powder in the material tank is ground by using the rotation of the grinding ball, and in this processing mode, if the heat dissipation effect cannot be effectively guaranteed, the static charge generated by the powder based on high-speed friction is easily adsorbed on the surface of the grinding ball, and the contact between the grinding ball and other powder is affected.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a preparation device of a lithium ion battery cathode silicon-carbon composite material, which can effectively dissipate the heat generated in the working process of a ball mill so as to ensure that the quality of a product processed by a ball milling method meets the production requirement.

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a lithium ion battery negative pole silicon carbon composite's preparation equipment, which comprises a bod, the bottom welding of organism has the base, and the top welding of organism has the barrel, the inner wall top fixed mounting of barrel has driving motor, and driving motor's output shaft passes through shaft coupling fixed connection with the top of actuating lever, the silo has been seted up at the top of organism, and the bottom fixed mounting of actuating lever has ball protection mechanism, ball protection mechanism is located the silo, be provided with in the organism and adhere to the powder and strike off the mechanism, and the middle part of bottom inlays in the silo and is equipped with the unloading net, the bottom of unloading net and the discharging pipe top fixed connection who installs the solenoid valve, and the interior top of base is run through to the bottom of discharging pipe, sliding connection has the material collection box in the base, the material collection box is located the below of discharging pipe and runs through the front of base.

Preferably, ball protection mechanism includes ball, pressure release mechanism and charge transfer mechanism, the ball is located the silo, and the bottom fixed connection of the top of ball and actuating lever, and the centre of sphere of ball is located the axis of silo, and pressure release mechanism's quantity is two, and two pressure release mechanisms are bilateral symmetry form and set up respectively in the left and right sides at the ball top, and charge transfer mechanism is the equidistance and encircles the form and set up in the ball.

Preferably, the pressure relief mechanism comprises a heat collection frame, an expansion air bag, a one-way valve, an exhaust pipe head, metal beads, an air delivery pipe head, a contact needle, a magnetic ring and a sealing soft sheet, the heat collection frame is fixedly connected to the inner top of the grinding ball, a notch is formed in the position, opposite to the heat collection frame, of the inner top of the grinding ball, the bottom of the expansion air bag is bonded with the inner bottom of the heat collection frame, the upper half of the expansion air bag extends into the notch, the one-way valve is inserted into the bottom of the heat collection frame, the air outlet end of the one-way valve is communicated with the inner cavity of the expansion air bag, the exhaust pipe head is inserted into the top of the expansion air bag and is communicated with the inner cavity of the expansion air bag, the metal pearl is the equidistance and encircles the form and inlay the top of inlaying at inflation gasbag, the surface at the interior top of notch and running through the ball is pegged graft to the gas transmission pipe head, and the top sliding connection of exhaust pipe head is in the gas transmission pipe head, conflict syringe needle fixed connection is in the exhaust pipe head, and the top of conflict syringe needle extends to in the gas transmission pipe head, the axial lead of conflict syringe needle and the axial lead coincidence of gas transmission pipe head, magnetic ring fixed connection is at the interior top of notch, two of the closed film are a set of top that sets up at the ball, and two mutually opposite side of closed film one side and the upper surface bonding of ball, two closed film's relative one side in close contact with and overlap joint are on the top of gas transmission pipe head.

Preferably, charge transfer mechanism includes recess, sacculus, iron bead, hollow metal sphere, conducting strip and the tensile fibre of electrically conductive, the inner wall at the ball is seted up to the recess, and half of sacculus is located the recess, and the side surface of sacculus bonds with the inner wall of ball, and a plurality of iron beads are filled between recess and sacculus, and the hollow metal sphere inlays the one side of carrying on the back the recess at the sacculus, and the conducting strip is row form equidistance and encircles the one side of bonding the close recess of internal surface at the sacculus, and the conducting strip is carried on the back one side of the sacculus inner wall one side fixedly connected with the tensile fibrous one end of electrically conductive, and the fibrous other end of electrically conductive tensile and hollow metal sphere fixed connection.

Preferably, a conical barrel is fixedly installed in the barrel, the driving rod is located in the conical barrel, the axis of the conical barrel coincides with the axis of the driving rod, and the conical barrel is located above the grinding balls.

Preferably, it includes annular chamber, magnetic ball, connection rope, connection piece, ball axle, ring gear, small motor and annular magnet to adhere to powder scraping mechanism, the annular chamber is seted up in the organism, and four magnetic balls are a set of equidistance and encircle form sliding connection in the silo, and through connecting rope fixed connection between per two adjacent magnetic balls of four magnetic balls, the quantity of connection piece is two, and two connection pieces are the left and right sides of fixed connection in annular magnet bottom respectively, ball axle fixed connection is at the interior bottom of annular chamber, two connection pieces are fixed connection respectively in the left and right sides of ball axle inner circle, the ring gear suit is on two connection pieces, and the right side of ring gear meshes with the left side of gear, the gear suit is on small motor's output shaft, and small motor fixed mounting is at the interior bottom of annular chamber.

The invention provides a preparation device of a lithium ion battery cathode silicon-carbon composite material. The method has the following beneficial effects:

(1) This lithium ion battery negative pole silicon carbon composite's preparation equipment, setting through ball protection mechanism, can monitor the pressure of ball self inside in the course of carrying out the grinding work in real time, the ball makes its inside gas molecule motion active at the high temperature that the in-process that continuously rotates to grind the powder, accessible ball protection mechanism in time forms the state of ball inner chamber and outside air intercommunication when ball internal pressure is higher, thereby reach the step-down effect to the ball inside, in order to avoid the ball the condition of breaking damage to appear under high temperature high-pressure state, simultaneously can carry out the transfer processing to ball surface static charge in the step-down in-process ball protection mechanism step-down, and then avoid the powder to appear owing to the condition that high temperature friction produced the absorption on the ball surface, thereby the normal grinding effect of ball to the powder has been ensured.

(2) The preparation equipment for the lithium ion battery cathode silicon-carbon composite material utilizes the adhesion powder scraping mechanism to operate, and aims to treat the powder which is formed into a local sheet shape by extrusion and is adhered to the inner wall of a grinding groove in the grinding process of a grinding ball, so that the powder falls off from the inner wall of the grinding groove to be further ground and the powder in the grinding groove is continuously loosened, the gap between powder particles tends to increase, the release of heat on the surface of the grinding ball is promoted, the cooling effect on the grinding ball is achieved to a certain extent, and the situation that the self cracking damage is caused by the fact that the powder continuously contacts and accumulates more heat at high speed with the powder with higher density is avoided.

(3) This lithium ion battery negative pole silicon carbon composite's preparation equipment, strike off the mechanism and cooperate the operation based on ball protection mechanism and attached powder, can effectively reduce the high temperature that produces in the ball working process, while ball protection mechanism is eliminated the static charge on the ball surface, it strikes off the mechanism synchronous operation and can form continuous discontinuous separation between powder and ball to adhere to the powder, when disturbing the static charge formation, can effectively shift the static charge of taking in the powder, and then fully avoid grinding the production of static charge in the working process, thereby effectively ensured the abundant grinding effect of ball to the powder.

Drawings

FIG. 1 is a front view of the structure of the present invention;

FIG. 2 is a front cross-sectional view of the structure of the present invention;

FIG. 3 is an enlarged view of the structure at A in FIG. 2;

FIG. 4 is an enlarged view of the structure at B in FIG. 2 according to the present invention;

fig. 5 is an enlarged view of the structure at C in fig. 2 according to the present invention.

In the figure: 1 machine body, 2 bases, 3 cylinder bodies, 4 driving motors, 5 driving rods, 6 troughs, 7 grinding ball protection mechanisms, 8 attached powder scraping mechanisms, 71 grinding balls, 72 pressure relief mechanisms, 73 charge transfer mechanisms, 721 heat collection frames, 722 expansion air bags, 723 one-way valves, 724 exhaust pipe heads, 725 metal beads, 726 air delivery pipe heads, 727 abutting needle heads, 728 magnetic rings, 729 closed soft sheets, 731 grooves, 732 air bags, 733 iron beads, 734 metal hollow balls, 735 conducting sheets, 736 conductive tensile fibers, 81 annular cavities, 82 magnetic balls, 83 connecting ropes, 84 connecting sheets, 85 ball shafts, 86 toothed rings, 87 gears, 88 miniature motors and 89 annular magnets.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Referring to fig. 1-5, the present invention provides a technical solution: the utility model provides a lithium ion battery negative pole silicon carbon composite's preparation equipment, including organism 1, the bottom welding of organism 1 has base 2, and the top welding of organism 1 has barrel 3, the inner wall top fixed mounting of barrel 3 has driving motor 4, and the output shaft of driving motor 4 passes through shaft coupling fixed connection with the top of actuating lever 5, silo 6 has been seted up at the top of organism 1, and the bottom fixed mounting of actuating lever 5 has ball protection mechanism 7, ball protection mechanism 7 is located silo 6, be provided with in the organism 1 and adhere to powder scraping mechanism 8, and the middle part of bottom inlays and is equipped with the unloading net in silo 6, the bottom of unloading net and the discharging pipe top fixed connection who installs the solenoid valve, and the bottom of discharging pipe runs through the interior top of base 2, sliding connection has the material collection box in base 2, the material collection box is located the below of discharging pipe and runs through the front of base 2.

The grinding ball protection mechanism 7 comprises a grinding ball 71, pressure relief mechanisms 72 and a charge transfer mechanism 73, wherein the grinding ball 71 is located in the trough 6, the top of the grinding ball 71 is fixedly connected with the bottom end of the driving rod 5, the center of the grinding ball 71 is located on the axis of the trough 6, the pressure relief mechanisms 72 are two in number, the two pressure relief mechanisms 72 are arranged on the left side and the right side of the top of the grinding ball 71 in a bilateral symmetry mode, and the charge transfer mechanism 73 is arranged in the grinding ball 71 in an equidistant surrounding mode.

The pressure relief mechanism 72 comprises a heat collecting frame 721, an expansion air bag 722, a one-way valve 723, an exhaust pipe head 724, a metal bead 725, an air pipe head 726, a collision needle 727, a magnetic ring 728 and a sealing soft sheet 729, the heat collecting frame 721 is fixedly connected to the inner top of the grinding ball 71, a notch is formed in the position, opposite to the heat collecting frame 721, of the inner top of the grinding ball 71, the bottom of the expansion air bag 722 is bonded with the inner bottom of the heat collecting frame 721, the upper half of the expansion air bag 722 extends into the notch, the one-way valve 723 penetrates through the bottom of the heat collecting frame 721, the air outlet end of the one-way valve 723 is communicated with the inner cavity of the expansion air bag 722, the exhaust pipe head 724 penetrates through the top of the expansion air bag 722 and is communicated with the inner cavity thereof, the metal bead 725 is embedded in the top of the expansion air bag 722 in an equidistant surrounding manner, the air pipe head 726 is inserted into the inner top of the notch and penetrates through the outer surface of the grinding ball 71, the top of the exhaust pipe head 724 is slidably connected into the air pipe head 726, the exhaust pipe head 727 is abutted against the needle head 724 and fixedly connected to one side of the air pipe head 726, the magnetic ring 726, the sealing soft sheet 729, the two sealing soft sheets are overlapped with the top of the grinding ball 729, and the two sealing soft sheets are tightly overlapped with the upper end of the grinding ball 729, and the magnetic ring.

The charge transfer mechanism 73 comprises a groove 731, a balloon 732, iron beads 733, hollow metal spheres 734, a conducting strip 735 and conductive tensile fibers 736, wherein the groove 731 is arranged on the inner wall of the grinding ball 71, half of the balloon 732 is positioned in the groove 732, the side surface of the balloon 732 is adhered to the inner wall of the grinding ball 71, a plurality of iron beads 733 are filled between the groove 731 and the balloon 732, the hollow metal spheres 734 are embedded on one side of the balloon 732 opposite to the groove 732, the conducting strips 735 are adhered to one side of the inner surface of the balloon 732 in a row shape at equal intervals and close to the groove 731, one side of the conducting strip 735 opposite to the inner wall of the balloon 732 is fixedly connected with one end of the conductive tensile fibers 736, the other end of the conductive tensile fibers 736 is fixedly connected with the hollow metal spheres 734, a tapered cylinder is fixedly installed in the cylinder 3, the driving rod 5 is positioned in the tapered cylinder, the axial line of the tapered cylinder is coincident with the axial line of the driving rod 5, and the tapered cylinder is positioned above the grinding ball 71.

The attached powder scraping mechanism 8 comprises an annular cavity 81, magnetic balls 82, a connecting rope 83, connecting pieces 84, a ball shaft 85, a toothed ring 86, a gear 87, a small motor 88 and an annular magnet 89, wherein the annular cavity 81 is arranged in the machine body 1, the four magnetic balls 82 are in a group of equidistant encircling sliding connection in the trough 6, every two adjacent magnetic balls 82 of the four magnetic balls 82 are fixedly connected through the connecting rope 83, the number of the connecting pieces 84 is two, the two connecting pieces 84 are respectively and fixedly connected to the left side and the right side of the bottom of the annular magnet 89, the ball shaft 85 is fixedly connected to the inner bottom of the annular cavity 81, the two connecting pieces 84 are respectively and fixedly connected to the left side and the right side of the inner ring of the ball shaft 85, the toothed ring 86 is sleeved on the two connecting pieces 84, the right side of the toothed ring 86 is meshed with the left side of the gear 87, the gear 87 is sleeved on the output shaft of the small motor 88, and the small motor 88 is fixedly installed at the inner bottom of the annular cavity 81.

When the grinding ball mill is used, powder enters the trough 6 through the barrel 3, the driving rod 5 is driven to rotate through the operation of the driving motor 4, the grinding ball 71 rotates in the trough 6, the powder is ground, when the temperature of the grinding ball 71 is too high, gas molecules in the grinding ball 71 actively move, the gas enters the expansion airbag 722 through the one-way valve 723, the expansion airbag 722 continuously expands towards a notch under the influence of the temperature, the exhaust pipe head 724 slides along the gas pipe head 726, the collision needle 727 drives the push-down unsealing soft sheet 729 at the exhaust pipe head 724, the gas in the expansion airbag 722 is rapidly sprayed out, the resetting speed of the expansion airbag 722 after the gas flow is sprayed out is delayed through the magnetic attraction between the magnetic ring 728 and the metal beads 725, so that high-temperature air in the grinding ball 71 is discharged through the expansion airbag 722, and the cooling effect on the grinding ball 71 is achieved, when the temperature in the grinding ball 71 rises, the balloon 732 expands by heating, so that the iron beads 733 are pushed to the top in the groove 731, static charges carried on the outer surface of the grinding ball 71 are transferred to the iron beads 723, the static charges are further discharged to the hollow metal ball 734 through the conductive sheet 735, the static charges carried by airflow are discharged when the gas in the grinding ball 71 is discharged by the pressure relief mechanism 72, the small motor 88 operates to drive the gear 87 and the toothed ring 86 to rotate, the toothed ring 86 rotates to drive the connecting sheet 84 and the annular magnet 89 to rotate, the magnetic ball 82 and the connecting rope 83 are driven to rotate in the trough 6 through magnetic attraction, powder attached to the inner wall of the trough 6 is scraped, the ground powder is discharged into the aggregate box through the discharging net and the discharging pipe, and a worker can pull the aggregate box to take the ground powder out of the aggregate box from the base 2.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides a preparation equipment of lithium ion battery negative pole silicon carbon composite, includes organism (1), its characterized in that: the grinding ball cleaning machine is characterized in that a base (2) is welded at the bottom of the machine body (1), a barrel (3) is welded at the top of the machine body (1), a driving motor (4) is fixedly mounted at the top of the inner wall of the barrel (3), an output shaft of the driving motor (4) is fixedly connected with the top end of a driving rod (5) through a coupler, a trough (6) is formed in the top of the machine body (1), a grinding ball protection mechanism (7) is fixedly mounted at the bottom end of the driving rod (5), the grinding ball protection mechanism (7) is located in the trough (6), an attached powder scraping mechanism (8) is arranged in the machine body (1), a blanking net is embedded in the middle of the inner bottom of the trough (6), the bottom of the blanking net is fixedly connected with the top end of a discharging pipe provided with a solenoid valve, the bottom end of the discharging pipe penetrates through the inner top of the base (2), a material collecting box is slidably connected with the base (2), and is located below the discharging pipe and penetrates through the front of the base (2);

the grinding ball protection mechanism (7) comprises grinding balls (71), pressure relief mechanisms (72) and charge transfer mechanisms (73), wherein the grinding balls (71) are positioned in the trough (6), the tops of the grinding balls (71) are fixedly connected with the bottom ends of the driving rods (5), the centers of the grinding balls (71) are positioned on the axis of the trough (6), the number of the pressure relief mechanisms (72) is two, the two pressure relief mechanisms (72) are arranged on the left side and the right side of the tops of the grinding balls (71) in a bilateral symmetry manner, and the charge transfer mechanisms (73) are arranged in the grinding balls (71) in an equidistant surrounding manner;

the pressure relief mechanism (72) comprises a heat collection frame (721), an expansion air bag (722), a one-way valve (723), an exhaust pipe head (724), a metal bead (725), an air pipe head (726), a collision needle head (727), a magnetic ring (728) and a sealing soft sheet (729), the heat collection frame (721) is fixedly connected to the inner top of the grinding ball (71), a notch is formed in the position, opposite to the heat collection frame (721), of the inner top of the grinding ball (71), the bottom of the expansion air bag (722) is bonded with the inner bottom of the heat collection frame (721), the upper half part of the expansion air bag (722) extends into the notch, the one-way valve (723) penetrates through the bottom of the heat collection frame (721), the air outlet end of the one-way valve (723) is communicated with the inner cavity of the expansion air bag (722), the exhaust pipe head (724) penetrates through the top of the expansion air bag (722) and is communicated with the inner cavity of the expansion air bag (722), the metal bead (725) penetrates through the top of the expansion air bag (722) in an equidistant surrounding manner and abuts against the top of the expansion air pipe head (727), the air pipe head (726) is connected to the outer surface of the air pipe head (727), the air pipe head is connected to the top of the air pipe head (727) in a shaft, and the air pipe head (727) is fixedly connected with the air pipe head, and the air pipe head (727), the magnetic rings (728) are fixedly connected to the inner top of the notches, the two sealing films (729) are arranged on the top of the grinding ball (71) in a group, the opposite sides of the two sealing films (729) are bonded with the upper surface of the grinding ball (71), and the opposite sides of the two sealing films (729) are in close contact and are lapped at the top end of the gas delivery pipe head (726).

2. The preparation equipment of the silicon-carbon composite material for the negative electrode of the lithium ion battery according to claim 1, characterized in that: the charge transfer mechanism (73) comprises a groove (731), a ball bag (732), iron beads (733), a hollow metal ball (734), a conducting strip (735) and conducting tensile fibers (736), the groove (731) is formed in the inner wall of the grinding ball (71), one half of the ball bag (732) is located in the groove (732), the side surface of the ball bag (732) is adhered to the inner wall of the grinding ball (71), the iron beads (733) are filled between the groove (731) and the ball bag (732), the hollow metal ball (734) is embedded in one side, opposite to the groove (732), of the ball bag (732), the conducting strip (735) is adhered to one side, close to the groove (731), of the inner surface of the ball bag (732) in a row shape in an equidistant mode, one side, opposite to the inner wall of the ball bag (732), of the conducting strip (735) is fixedly connected with one end of the conducting tensile fibers (736), and the other end of the conducting tensile fibers (736) is fixedly connected with the hollow metal ball (734).

3. The preparation equipment of the silicon-carbon composite material for the negative electrode of the lithium ion battery according to claim 1, characterized in that: a conical barrel is fixedly installed in the barrel body (3), the driving rod (5) is located in the conical barrel, the axis of the conical barrel coincides with the axis of the driving rod (5), and the conical barrel is located above the grinding balls (71).

4. The preparation equipment of the silicon-carbon composite material for the negative electrode of the lithium ion battery according to claim 1, characterized in that: the attached powder scraping mechanism (8) comprises an annular cavity (81), magnetic balls (82), a connecting rope (83), connecting sheets (84), a ball shaft (85), gear rings (86), a gear (87), a small motor (88) and annular magnets (89), wherein the annular cavity (81) is formed in the machine body (1), the four magnetic balls (82) are in a group and are in equidistant surrounding sliding connection in a trough (6), every two adjacent magnetic balls (82) of the four magnetic balls (82) are fixedly connected through the connecting rope (83), the number of the connecting sheets (84) is two, the two connecting sheets (84) are respectively and fixedly connected to the left side and the right side of the bottom of the annular magnet (89), the ball shaft (85) is fixedly connected to the inner bottom of the annular cavity (81), the two annular cavities (84) are respectively and fixedly connected to the left side and the right side of the inner ring of the ball shaft (85), the gear rings (86) are sleeved on the two connecting sheets (84), the right side of the gear rings (86) is meshed with the left side of the gear (87), the output shaft of the small motor (88) is fixedly installed on the inner shaft of the small motor (88), and the small motor (81) is fixedly installed at the inner bottom of the inner ring (81).