CN216322943U

CN216322943U - Coating device for high-viscosity slurry in secondary battery coating process

Info

Publication number: CN216322943U
Application number: CN202122245404.5U
Authority: CN
Inventors: 张凤英
Original assignee: Snow Liangneng New Energy Technology Beijing Co ltd
Current assignee: Snow Liangneng New Energy Technology Beijing Co ltd
Priority date: 2021-09-16
Filing date: 2021-09-16
Publication date: 2022-04-19
Anticipated expiration: 2031-09-16

Abstract

The utility model discloses a coating device for high-viscosity slurry in a secondary battery coating process, which comprises a reference roller fixedly arranged on the ground, wherein a vibration mechanism is arranged right above the reference roller, slits are formed on the peripheries of the vibration mechanism and the reference roller, a feeding pool for containing the slurry is fixedly arranged in the material incoming direction of a base material between the slits, the base material is positioned at the bottom surface of the feeding pool, a slurry conveying pipeline for injecting the slurry into the feeding pool is arranged on the feeding pool, and a baffle plate for limiting the coating width of the slurry is arranged on the side surface of the feeding pool; the vibration mechanism comprises a scraping mechanism provided with a six-degree vibrator. The device disclosed by the utility model is simple in structure and convenient to operate, and can be used for effectively and uniformly coating the high-viscosity coating. The utility model is suitable for the coating of any pole piece.

Description

Coating device for high-viscosity slurry in secondary battery coating process

Technical Field

The utility model belongs to the field of secondary battery production, relates to a slurry coating process in secondary battery production, and particularly relates to a coating device for high-viscosity slurry in a secondary battery coating process.

Background

The secondary battery coating process is an important process segment for producing secondary batteries, and aims to uniformly coat and stick anode and cathode materials of the secondary batteries to a current collector after the anode and cathode materials of the secondary batteries are made into slurry so as to form a pole piece of the secondary batteries. The secondary battery pole piece is manufactured into the secondary battery through key processes of rolling, slitting, winding or laminating, packaging, drying, liquid injection, formation, standing and the like in sequence.

The coating method of the coating machine used in the lithium battery industry at present adopts an extrusion process to uniformly coat slurry on a current collector, and the method has higher requirements on the physical state of the slurry, such as the slurry has lower kinematic viscosity, better self-leveling property, better adhesive property and the like. The slurry for coating mainly comprises a positive electrode material or a negative electrode material of a secondary battery, a conductive agent, a bonding agent, a solvent and the like, and in order to enable the slurry to meet the physical property requirements of the coating process on the slurry in the prior art, a large amount of solvent is required to be added into the slurry to reduce the viscosity in the stirring process, so that the aim of adapting to the coating process is fulfilled. And after coating, all solvents are required to be baked out to dry the pole piece.

The negative effects caused by the low-viscosity slurry (oily) in the process include the problems that the electrode is easy to separate, the active substance and the conductive agent are agglomerated, the internal resistance of the secondary battery is increased and the like in the later period. Meanwhile, because the coating slurry is diluted in a large amount in the early stage, a series of cost problems such as high energy consumption, difficult solvent recovery, high equipment cost and the like are brought in the later stage.

Under the slit gap in the prior art, if high-viscosity slurry is coated, the slurry is high in viscosity and poor in fluidity, a preset coating area is not completely coated with the slurry after being processed by the device, and then a foil leakage phenomenon occurs (one reason for the foil leakage phenomenon is that micro bubbles exist in the high-viscosity slurry, the conventional coating device cannot eliminate the foil leakage phenomenon caused by the micro bubbles, and the other reason for the foil leakage phenomenon is that the foil leakage phenomenon with non-passability caused by aggregation of large particles can exist when a pole piece with the coating gap being 1-5 times smaller than the particle size of the large particles of the slurry).

For the above reasons, there is a need in the art for a device that can effectively coat high viscosity slurries.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a coating device of high-viscosity slurry in a secondary battery coating process, which can apply vibration force while coating the slurry and can more uniformly coat the high-viscosity slurry.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a coating device for high-viscosity slurry in a secondary battery coating process comprises a reference roller fixedly arranged on the ground, wherein a vibration mechanism is arranged right above the reference roller, slits are formed between the vibration mechanism and the periphery of the reference roller, a feeding pool for containing the slurry is fixedly arranged in the feeding direction of a base material between the slits, the base material is positioned at the bottom surface of the feeding pool, a slurry conveying pipeline for injecting the slurry into the feeding pool is arranged on the feeding pool, and a baffle plate for limiting the coating width of the slurry is arranged on the side surface of the feeding pool;

the vibration mechanism comprises a scraping mechanism provided with a six-degree vibrator.

As a limitation to the above-described coating apparatus: the scraping mechanism comprises a kinetic energy roller and a kinetic energy roller vibrator which can rotate independently, the kinetic energy roller is fixedly arranged on a vibrating plate of the kinetic energy roller vibrator and is driven by a kinetic energy roller driving system, the rotating speed is 0-24000 r/min, and a base of the kinetic energy roller vibrator is fixedly arranged on the ground.

As a further limitation to the above coating apparatus: the surface of the scraping mechanism comprising the kinetic energy roller is any one of a cutting edge, a straight edge, an inclined edge, a spiral edge, a special-shaped edge and an arc surface, and at least one cutting edge, one straight edge, one inclined edge, one spiral edge, one special-shaped edge and one arc surface are arranged.

As another limitation to the above-mentioned coating apparatus: the scraping mechanism comprises a kinetic energy plate and a kinetic energy plate vibrator, the kinetic energy plate is fixedly arranged on a vibrating plate of the kinetic energy plate vibrator, a base of the kinetic energy plate vibrator is fixedly arranged on the ground, and a coating slit is arranged between a slurry contact surface of the kinetic energy plate and the reference roller.

As a further limitation to another limitation of the above coating apparatus: the surface of the kinetic energy plate opposite to the reference roller is any one of a circular arc surface, a plane, a special-shaped surface and a sharp edge surface.

Due to the adoption of the technical scheme, compared with the prior art, the utility model has the technical progress that:

(1) the utility model applies the vibration force while coating the slurry, can effectively utilize mechanical kinetic energy, such as a single mode of vibration impact, wiping pressure and beating or a mode of multiple combined use, so that the slurry is deformed under the action of mechanical action while entering the slit of the coating device to form the required coating thickness and is simultaneously bonded on the current collector, thereby further enabling the high-viscosity slurry to be coated more uniformly, namely, the method can effectively coat the high-viscosity slurry, the slurry can meet the requirement of coating without diluting the slurry too thin in the process of preparing the slurry, further saving the drying energy in the process of drying the pole piece in the later period, and reducing the requirement on drying equipment;

(2) the utility model is based on the prior art, and the vibrator is a six-degree vibrator (six-degree vibration refers to vibration in six directions such as horizontal, vertical, front and back), so that the kinetic energy roller 3 or the kinetic energy plate 4 can vibrate fully, under the blocking of the mechanical motion of the kinetic energy roller 3 or the kinetic energy plate 4, slurry with excessive thickness is blocked in the feeding pool 2, the slurry adhered on the base material 12 passes through a slit formed between the reference roller 1 and the kinetic energy roller 3 or the kinetic energy plate 4, and a slurry coating with proper thickness is left and is adhered with the base material to form a pole piece;

(3) the dynamic energy plate or the dynamic energy roller and the reference roller are provided with structures such as a knife edge and the like on the surface close to each other, so that the uniformity of slurry coating can be further ensured.

In conclusion, the device disclosed by the utility model is simple in structure and convenient to operate, and can be used for effectively and uniformly coating the high-viscosity coating. The utility model is suitable for the coating of any pole piece.

Drawings

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

FIG. 2 is a right side view of FIG. 1;

FIG. 3 is a front view of embodiment 2;

fig. 4 is a right side view of fig. 3.

In the figure: 1. a reference roller; 11. a reference roll drive system; 12. a substrate; 13. pole pieces; 14. unwinding rollers; 15. a wind-up roll; 2. a feeding tank; 21. a slurry delivery conduit; 22. sizing agent; 23. a baffle plate; 3. a kinetic energy roller; 31. a kinetic energy roller vibrator; 32. a kinetic energy roller drive system; 4. a kinetic energy plate; 41. kinetic plate vibrators.

Detailed Description

For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.

Example 1 coating apparatus for high viscosity slurry in coating process of secondary battery

In the embodiment, the terms "front", "rear", "left" and "right" are defined for convenience of description, and do not limit the scope of the present invention.

In the present embodiment, as shown in fig. 1 and 2, an apparatus for applying a high viscosity paste in a secondary battery application process includes:

the first reference roller 1 is fixedly arranged on the ground through a bearing seat, an unwinding roller 14 is fixedly arranged on one side of the left side and the right side of the first reference roller 1, a winding roller 15 is fixedly arranged on the other side of the left side and the right side of the first reference roller 1, the base material 12 is wound on the first reference roller 1 through the unwinding roller 14, and after slurry coating is carried out on the first reference roller 1, the base material is wound up through the winding roller 15.

And the vibrating mechanism is fixedly arranged right above the reference roller 1 and comprises a scraping mechanism provided with a six-degree vibrator. The scraping mechanism in this embodiment includes a kinetic energy roller 3 and a kinetic energy roller vibrator 31, the kinetic energy roller 3 is fixedly disposed on a vibration plate of the kinetic energy roller vibrator 31 and is driven by a kinetic energy roller driving system 32, and a base of the kinetic energy roller vibrator 31 is fixedly disposed on the ground by a steel frame. The rotating speed of the kinetic energy roller 3 in this embodiment is 0-24000 r/min, and the surface of the kinetic energy roller 3 in this embodiment is a blade structure, and the number of the blades is at least one, and 86 in this embodiment. The surface of the kinetic energy roller 3 may be any one of a straight edge, a slanted edge, a spiral edge, a special-shaped edge and a circular arc surface, and at least one of a straight edge, a slanted edge, a spiral edge, a special-shaped edge and a circular arc surface is provided according to the common general knowledge of the skilled person.

A slit of 0-5 mm is formed between the outer periphery of the kinetic energy roller 3 and the reference roller 1 in the embodiment, and is used for coating slurry. The kinetic roller vibrator 31 in the present embodiment is a six-degree vibrator (six-degree vibration means vibration in six directions, i.e., horizontal, vertical, front-rear, etc.).

The slurry supply mechanism comprises a feeding pool 2 for containing slurry 22, the feeding pool is fixedly arranged at the feeding direction of a base material 12, the base material 12 is positioned at the bottom of the feeding pool 2, a slurry conveying pipeline 21 for injecting slurry into the feeding pool 2 is arranged on the feeding pool 2, and a baffle 23 for limiting the slurry coating width is arranged on the side surface of the feeding pool 2.

The feeding pool 2 in the embodiment has a heating function, the heating temperature is 0-300 ℃, the higher the temperature is, the higher the temperature of the slurry with the same solid content is, the larger the cone penetration value of the slurry is, and the easier the coating process is.

The working principle of the embodiment is as follows: when the device works, a certain amount of slurry 22 is pre-stored in the feeding pool 2, so that the slurry 22 is always fully piled in front of the slit, and the uniform and full coating is ensured. The reference roll 1 rotates in the direction shown in fig. 1, carrying the base substrate 12 in the direction shown, while the base substrate 12 carries the slurry 22 over the base substrate 12 forward in the direction of movement of the base substrate 12. The kinetic energy roller 3 rotates in the direction opposite to the rotational direction of the reference roller 1 as shown in fig. 1, and the kinetic energy roller vibration generator 31 drives the kinetic energy roller 3 to vibrate six degrees. In this way, slurry with excessive thickness is blocked in the feeding tank 2 under the blocking of the mechanical movement of the kinetic energy roller 3, and the slurry adhered on the base material 12 passes through the slit formed by the reference roller 1 and the kinetic energy roller 3, so that a slurry coating with proper thickness is left to be adhered with the base material to form the pole piece 13.

Example 2 coating apparatus for high viscosity paste in coating process of secondary battery

The present embodiment is substantially the same as embodiment 1, except that the vibration mechanism has a different structure, as shown in fig. 3 and 4, the vibration mechanism includes a kinetic energy plate 4 and a kinetic energy plate vibrator 41, the kinetic energy plate 4 is fixedly disposed on the vibration plate of the kinetic energy plate vibrator 41, the base of the kinetic energy plate vibrator 41 is fixedly disposed on the ground through a steel frame, and a coating slit is disposed between the slurry contact surface of the kinetic energy plate 4 and the reference roller 1.

In this embodiment, the surface of the kinetic energy plate 4 close to the reference roll 1 is an arc surface, and may be any one of a plane, a special-shaped surface, and a sharp edge surface.

Other structures of this embodiment are the same as those of embodiment 1, and are not described again.

Example 3 coating method of high viscosity slurry for coating Process of Secondary Battery

In this embodiment, the device provided in

embodiment

1 or 2 is used to coat the base material 12 with slurry, and when the vibration frequency of the kinetic energy roller 3 or the kinetic energy plate 4 is 1 to 10MHz and the amplitude is 0.1 to 5000 μm, a better coating effect can be achieved. And according to different states of the slurry, the practical application conditions are more, the slurry of different systems, the slurry of different particle sizes, the slurry of different proportions and the slurry of different viscosities (the viscosity of the slurry in the embodiment is greater than 5000mPa · s, or the cone penetration range of the slurry is 3-45 mm), the vibration direction, the amplitude and the frequency of the six-degree direction and the surface structure of the kinetic energy plate of the kinetic energy roller vibrator 31 or the kinetic energy plate vibrator 41 are different, and the vibration direction, the amplitude and the vibration frequency are selected when different slurries given in the following table are used for coating.

TABLE 1

The above description is only the best description of the present embodiment and should not be construed as limiting the scope of the present invention.

Claims

1. The coating device for the high-viscosity slurry in the coating process of the secondary battery is characterized by comprising a reference roller (1) fixedly arranged on the ground, a vibration mechanism is arranged right above the reference roller (1), a slit is formed between the vibration mechanism and the periphery of the reference roller (1), a feeding pool (2) for containing the slurry (22) is fixedly arranged in the feeding direction of a base material (12) between the slits, the base material (12) is positioned at the bottom surface of the feeding pool (2), a slurry conveying pipeline (21) for injecting the slurry into the feeding pool (2) is arranged on the feeding pool (2), and a baffle plate for limiting the coating width of the slurry is arranged on the side surface of the feeding pool (2);

2. The coating apparatus for high viscosity paste in secondary battery coating process according to claim 1, wherein the scraping mechanism comprises a kinetic energy roller (3) and a kinetic energy roller vibrator (31) which can rotate independently, the kinetic energy roller (3) is fixedly arranged on a vibrating plate of the kinetic energy roller vibrator (31) and is driven by a kinetic energy roller driving system (32), the rotating speed is 0-24000 r/min, and a base of the kinetic energy roller vibrator (31) is fixedly arranged on the ground.

3. The coating apparatus for high viscosity paste in secondary battery coating process according to claim 2, wherein the surface of the kinetic energy roller (3) is any one of a blade, a straight blade, a slant blade, a spiral blade, and a circular arc surface, and at least one of the blade, the straight blade, the slant blade, the spiral blade, and the circular arc surface is provided.

4. The coating apparatus for high viscosity slurry in secondary battery coating process according to claim 1, wherein the scraping mechanism comprises a kinetic energy plate (4) and a kinetic energy plate vibrator (41), the kinetic energy plate (4) is fixedly arranged on a vibrating plate of the kinetic energy plate vibrator (41), a base of the kinetic energy plate vibrator (41) is fixedly arranged on the ground, and a coating slit is arranged between a slurry contact surface of the kinetic energy plate (4) and the reference roller (1).

5. The coating apparatus for high viscosity paste in secondary battery coating process according to claim 4, wherein the surface of the kinetic energy plate (4) facing the reference roll (1) is any one of a circular arc surface, a flat surface and a sharp edge surface.