CN220627850U - Pole piece film preparation equipment - Google Patents

Abstract

The application relates to the technical field of lithium battery production devices, in particular to pole piece film preparation equipment, which comprises a frame, still including setting gradually in the feeding structure, roll-in structure and the rolling structure of frame, feeding structure is including setting up in the feed bin of frame, the pay-off screw rod of being connected with the feed bin, cover in the heating coil of pay-off screw rod and the die head of extruding, the die head of extruding is connected in the one end that the feed screw rod kept away from the feed bin, the die head of extruding is towards roll-in structure. And conveying raw materials by using a feeding screw, heating the raw materials in a heating coil, extruding the raw materials into a compression roller structure through a sheet extrusion die head, and rolling. On one hand, NMP solvent is avoided, on the other hand, the heating coil is matched, the semi-solid material can be accurately conveyed and extruded by using the feeding screw and the sheet extrusion die head, the feeding amount and uniformity are guaranteed, the problems of uneven thickness of the pole piece film and easy breakage of the pole piece film are avoided in the follow-up rolling, and the preparation efficiency is effectively improved.

Description

Pole piece film preparation equipment

Technical Field

The application relates to the technical field of lithium battery production devices, in particular to pole piece film preparation equipment.

Background

In the production and manufacture of lithium batteries, a lithium battery pole piece is generally manufactured by steps of drying, rolling, slitting and the like of a current collector and slurry coated on the current collector. Because the slurry needs to use N-methyl pyrrolidone (namely 'NMP') as a solvent, the solvent belongs to inflammable, explosive and toxic substances, and therefore, the problems of high safety risk, high recovery cost, difficulty in meeting the environmental protection requirement and the like exist in the production process of the lithium battery.

To solve these problems, slurries have been replaced in the production process by using solid electrode diaphragms. The dry powder containing active agent, conductive material, binder and the like is directly fed into a rolling structure through a charging barrel, thin pole piece films are formed through the rolling structure, the pole piece films are pressed on the front side and the back side of a current collector, and finally the pole piece is formed through slitting. By using the method, the feeding amount is difficult to control by feeding through the charging barrel, and the problems of uneven thickness of the pole piece film and easy breakage of the pole piece film are easy to occur, so that the pole piece productivity is lower.

Disclosure of Invention

In order to solve the problems that the thickness of the pole piece film is uneven and the pole piece film is easy to break due to the difficulty in controlling the feeding amount in the related technology, the utility model provides pole piece film preparation equipment.

The utility model provides a pole piece membrane preparation equipment, includes the frame, still including set gradually in feeding structure, roll-in structure and the rolling structure of frame, feeding structure including set up in the feed bin of frame, with the pay-off screw rod that the feed bin is connected, cover in the heating coil of pay-off screw rod and extrusion die head, extrusion die head connect in the pay-off screw rod is kept away from the one end of feed bin, extrusion die head orientation the roll-in structure.

Further, the rolling structure comprises a cooling rolling component, a first adjustable rolling component, a force expansion roller and a second adjustable rolling component which are sequentially arranged on the frame.

Further, the cooling roll pressing assembly comprises a first cooling roll and a second cooling roll which are rotatably connected to the frame, the axes of the first cooling roll and the second cooling roll are located on the same horizontal plane, and the sheet extrusion die head faces to the first cooling roll.

Further, the cooling roller pressing assembly further comprises a first adjusting oil cylinder used for driving the second cooling roller to move, the frame is slidably connected with a moving slide plate, the second cooling roller is installed on the moving slide plate, the moving slide plate is connected with the output end of the first adjusting oil cylinder, and the second cooling roller is driven by the first adjusting oil cylinder to move towards a direction close to or far away from the first cooling roller.

Further, the first adjustable rolling assembly comprises a first upper roller assembly and a first lower roller assembly, the first upper roller assembly comprises a main roller, a front inlet roller, a rear outlet roller, an upper tensioning roller and an upper steel belt which are rotatably connected with the frame, and the upper steel belt is coated on the main roller, the front inlet roller, the rear outlet roller and the upper tensioning roller; the first lower roller assembly comprises a lifting slide plate which is in sliding connection with the frame, the lifting slide plate is rotationally connected with a movable roller, a lower front guide-in roller, a lower guide-out roller, a lower tensioning roller and a lower steel belt, and the lower steel belt is coated on the movable roller, the lower front guide-in roller, the lower guide-out roller and the lower tensioning roller.

Further, the first adjustable rolling assembly further comprises a second adjusting oil cylinder for driving the lifting slide plate, the lifting slide plate is connected to the output end of the second adjusting oil cylinder, and the lifting slide plate moves towards the direction close to or far away from the first upper roller assembly under the driving of the second adjusting oil cylinder.

Further, still including set up in the roll-in structure with detection structure between the rolling structure, detection structure including two sets of rotation connect in the soft compression roller of frame, two sets of be provided with between the soft compression roller and be used for detecting the laser displacement sensing subassembly of pole piece film thickness.

Further, the winding structure comprises a trimming cutter and a winding roller which are arranged on the frame.

The utility model has the following advantages:

1. according to the pole piece film preparation equipment, a feeding structure is provided with a structure of a storage bin, a feeding screw, a heating coil and a pole piece extrusion die head, raw materials are conveyed by the feeding screw, heated in the heating coil and extruded into a compression roller structure through the pole piece extrusion die head for rolling. On one hand, NMP solvent is avoided, on the other hand, the heating coil is matched, the semi-solid material can be accurately conveyed and extruded by using the feeding screw and the sheet extrusion die head, the feeding amount and uniformity are guaranteed, the problems of uneven thickness of the pole piece film and easy breakage of the pole piece film are avoided in the follow-up rolling, and the preparation efficiency is effectively improved.

2. The rolling structure of the pole piece film preparation equipment is set to be a cooling rolling component, a first adjustable rolling component, an expanding roller and a second adjustable rolling component. The material that the feeding structure got into carries out preliminary cooling design in cooling roll-in subassembly, later loops through first adjustable roll-in subassembly, expanding roller and the adjustable roll-in subassembly of second and roll-in. The material is rolled and stretched in a semi-solid (softened) state, and the compaction of the pole piece film can be realized only by small rolling pressure and small compression roller due to good plasticity, so that the breakage of molecular chains caused by the application of excessive pressure is effectively avoided.

3. The pole piece film preparation equipment is also provided with a detection structure for detecting the thickness of the pole piece film, and the thickness of the finished pole piece film can be timely obtained through the detection structure, so that the rolling structure can be conveniently adjusted according to the thickness of the pole piece film.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a pole piece film manufacturing apparatus according to an embodiment of the present application;

FIG. 2 is a schematic view of the first adjustable roller assembly, the expansion roller and the second adjustable roller assembly shown in FIG. 1;

FIG. 3 is a schematic diagram of the detecting structure and the winding structure in FIG. 1;

fig. 4 is a schematic diagram showing the distribution of the laser displacement sensor in the detection structure.

Reference numerals illustrate:

1. a frame; 2. a feed structure; 21. a storage bin; 22. a feed screw; 23. a heating coil; 24. a sheet extrusion die head; 3. a roll-in structure; 31. cooling the roll-in assembly; 311. a first cooling roller; 312. a second cooling roller; 313. a first adjusting cylinder; 32. a first adjustable roller assembly; 321. a first upper roller assembly; 3211. a main roller; 3212. a front entry roller; 3213. a rear roller is arranged; 3214. an upper tension roller; 3215. applying a steel belt; 322. a first lower roller assembly; 3221. a lifting slide plate; 3222. a movable roller; 3223. a lower leading-in roller; 3224. a lower lead-out roller; 3225. a lower tension roller; 3226. a lower steel belt; 323. a second adjusting cylinder; 33. an expanding roller; 34. a second adjustable roller assembly; 341. a second upper roller assembly; 342. a second lower roller assembly; 343. a third adjusting cylinder; 4. a detection structure; 41. a soft press roll; 42. a laser displacement sensing assembly; 421. a laser displacement sensor; 5. a winding structure; 51. a trimming cutter; 52. and (5) a wind-up roller.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1, a pole piece film preparation apparatus includes a frame 1 for supporting, and further includes a feeding structure 2, a rolling structure 3 and a rolling structure 5 sequentially disposed on the frame 1. When the preparation equipment is operated, the feeding structure 2 sends materials into the rolling structure 3, the rolling structure 3 rolls the materials to form a pole piece film, and the rolling structure 5 rolls the pole piece film.

Specifically, the feeding structure 2 comprises a bin 21 arranged on the frame 1, a feeding screw 22 connected with the bin 21, a heating coil 23 covered on the feeding screw 22 and a sheet extrusion die head 24, wherein the sheet extrusion die head 24 is connected to one end of the feeding screw 22 far away from the bin 21, and the sheet extrusion die head 24 faces the rolling structure 3. The bin 21 has its opening facing vertically downwards and communicates with the feed screw 22. The bin 21 is filled with dry powder material, and the feed screw 22 transports the dry powder material to the front end of the feed screw 22 when the feed screw 22 is running. The heating coil 23 is wrapped around the front end of the feed screw 22, and when the dry powder material passes through the heating coil 23, the dry powder material is heated to a molten state and fed into the extrusion die 24 through a pipe. The position of the extrusion die head 24 is fixed, the output end of the extrusion die head 24 faces the rolling structure 3, and after the dry powder material in a molten state is sent out from the extrusion die head 24, a thick sheet with a certain width and thickness is formed and enters the rolling structure 3.

Due to the use of the feed screw 22 and the sheet die 24, the dry powder material can be accurately metered into the roll-in structure 3. Meanwhile, the dry powder is heated, so that the bonding agent molecular chains in the dry powder are fully staggered and bonded, the conductive substances, the active agents and other components in the dry powder are fully bonded, the uniform calendaring of the pole piece film is ensured during subsequent conveying and rolling, and the pole piece film is high in bonding strength, good in toughness and not easy to break.

Referring to fig. 1 and 2, the rolling structure 3 includes a cooling rolling assembly 31, a first adjustable rolling assembly 32, a force roller 33, and a second adjustable rolling assembly 34, which are sequentially disposed on the frame 1. The cooling roll assembly 31 is used for reducing the temperature of the dry powder material entering the roll structure 3, the dry powder material is converted into a semi-solid softened state, and then the dry powder material is roll-stretched and formed by the first adjustable roll assembly 32 and the second adjustable roll assembly 34, and the expansion roll 33 is used for maintaining the tension of the pole piece film.

Specifically, the cooling roller assembly 31 includes a first cooling roller 311 and a second cooling roller 312 mounted on the frame 1, and the axes of the first cooling roller 311 and the second cooling roller 312 are located at the same horizontal plane. The first cooling roller 311 is rotatably connected to the frame 1, and the first cooling roller 311 rotates clockwise. The frame 1 is slidably connected with a moving slide (not shown in the figure), and the moving slide can slide left and right on the frame 1 to approach or separate from the first cooling roller 311, and the second cooling roller 312 is rotatably connected with the moving slide. The cooling roller assembly 31 further comprises a first adjusting cylinder 313 for driving the second cooling roller 312 to move, the moving sliding plate is connected with the output end of the first adjusting cylinder 313, and the second cooling roller 312 is driven by the first adjusting cylinder 313 to move towards a direction close to or far away from the first cooling roller 311, so that the forming thickness of the thick sheet is adjusted to be convenient for matching with the subsequent rolling.

The extrusion die head 24 faces the first cooling roller 311, and the first cooling roller 311 and the second cooling roller 312 are respectively provided with a pore passage for passing the refrigerant, and the pore passage can continuously flow the refrigerant to control the temperatures of the first cooling roller 311 and the second cooling roller 312. After the thick sheet with a certain width and thickness is extruded by the sheet extrusion die head 24, the thick sheet can be rolled along with the movement of the first cooling roller 311 between the first cooling roller 311 and the second cooling roller 312, and the temperature of the thick sheet can be reduced in the process, so that preliminary cooling and shaping are realized. In the process, the thick sheet is rolled and stretched under the condition of semi-solid softening, so that the compaction of the pole piece film can be realized only by small rolling pressure and small compression roller due to good plasticity, and the breakage of a molecular chain caused by the application of excessive pressure is effectively avoided.

The first adjustable rolling assembly 32 and the second adjustable rolling assembly 34 are used for rolling the thick sheet to form a pole piece film, the first adjustable rolling assembly 32 and the second adjustable rolling assembly 34 have the same structure, and the expansion roller 33 is arranged between the first adjustable rolling assembly 32 and the second adjustable rolling assembly 34.

Specifically, the first adjustable roll assembly 32 includes a first upper roll assembly 321 and a first lower roll assembly 322, and the first upper roll assembly 321 includes a main roll 3211, a front entrance roll 3212, a rear exit roll 3213, an upper tension roll 3214, and an upper steel strip 3215 rotatably connected to the frame 1. The front entering roller 3212 is located in front of the main roller 3211, the rear exiting roller 3213 is located behind the main roller 3211, the upper tensioning roller 3214 is located above the main roller 3211, the upper steel belt 3215 is coated on the main roller 3211, the front entering roller 3212, the rear exiting roller 3213 and the upper tensioning roller 3214, and when the main roller 3211 rotates, the steel belt can be driven to rotate. It will be appreciated that in actual use, the height position of the front entry roller 3212 relative to the frame 1 may be adjusted to adjust the lead-in angle of the steel strip, the height position of the rear exit roller 3213 relative to the frame 1 may be adjusted to adjust the lead-out angle of the steel strip, and the height position of the upper tension roller 3214 relative to the frame 1 may be adjusted to control the tension of the steel strip.

Correspondingly, the first lower roller assembly 322 comprises a lifting slide plate 3221 slidably connected with the frame 1, and the lifting slide plate 3221 can slide up and down relative to the frame 1. The lifting slide 3221 is rotatably connected with a movable roller 3222, a lower front guiding roller 3223, a lower guiding roller 3224, a lower tensioning roller 3225 and a lower steel belt 3226, wherein the movable roller 3222, the lower front guiding roller 3223, the lower guiding roller 3224 and the lower tensioning roller 3225 are covered by the lower steel belt 3226. Likewise, in actual use, the height position of lower leading-in roller 3223 relative to lifting slide 3221 may be adjusted to adjust the lead-in angle of the steel strip, the height position of lower leading-out roller 3224 relative to lifting slide 3221 may be adjusted to adjust the lead-out angle of the steel strip, and the height position of lower tensioning roller 3225 relative to lifting slide 3221 may be adjusted to control the tensioning force of the steel strip.

The first adjustable roller assembly 32 further includes a second adjusting cylinder 323 for driving the lifting slide 3221, the lifting slide 3221 is connected to an output end of the second adjusting cylinder 323, and the lifting slide 3221 is driven by the second adjusting cylinder 323 to move towards a direction approaching or separating from the first upper roller assembly 321. The distance between the first lower roller assembly 322 and the first upper roller assembly 321 can be adjusted by the second adjusting oil cylinder 323, so that the thickness of the pole piece film can be adjusted.

The structure of the second adjustable rolling assembly 34 is the same as that of the first adjustable rolling assembly 32, that is, the second adjustable rolling assembly 34 includes a second upper roller assembly 341, a second lower roller assembly 342, and a third adjusting cylinder 343 for driving the second lower roller assembly 342, and the working principle of the second adjustable rolling assembly 34 is the same as that of the first adjustable rolling assembly 32, which is not described again.

Referring to fig. 3 and 4, in order to conveniently obtain the thickness of the pole piece film, the pole piece film manufacturing apparatus further includes a detecting structure 4 disposed between the rolling structure 3 and the rolling structure 5, the detecting structure 4 includes two sets of soft press rollers 41 rotatably connected to the frame 1, and a laser displacement sensing assembly 42 for detecting the thickness of the pole piece film is disposed between the two sets of soft press rollers 41. The pole piece film passes through the two groups of soft press rollers 41, and the soft press rollers 41 can effectively avoid measurement errors caused by shaking of the pole piece film. The laser displacement sensing assembly 42 comprises a laser displacement sensor 421, wherein the two laser displacement sensors 421 are respectively arranged above and below the pole piece film, and when the pole piece film passes through the laser displacement sensing assembly 42, the thickness of the pole piece film can be measured by the laser displacement sensing assembly 42.

Further, a plurality of thicknesses of the pole piece film in the width direction can be accurately detected by providing a plurality of pairs of laser displacement sensors 421. In this embodiment, the laser displacement sensors 421 have four groups, and the four groups of laser displacement sensors 421 are arranged in an inclined manner above the pole piece film to perform multi-position detection on the pole piece film. It is understood that the four groups of laser displacement sensors 421 can also be arranged in a straight line and follow the pole piece film to detect the pole piece film. The laser displacement sensor 421 is a prior art and can be obtained by purchase, and the structure and principle thereof will not be described again.

The winding structure 5 comprises a trimming cutter 51 and a winding roller 52 which are arranged on the frame 1. The trimming cutter 51 is used for removing burrs on two sides of the pole piece film in the width direction, and the winding roller 52 winds and collects the pole piece film passing through the trimming cutter 51.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (8)

1. The utility model provides a pole piece membrane preparation equipment, includes frame (1), its characterized in that still including set up in feeding structure (2), roll-in structure (3) and rolling structure (5) of frame (1), feeding structure (2) including set up in feed bin (21) of frame (1), with feed screw (22) that feed bin (21) are connected, cover in heating coil (23) and extrusion die head (24) of feed screw (22), extrusion die head (24) connect in feed screw (22) are kept away from the one end of feed bin (21), extrusion die head (24) orientation roll-in structure (3).

2. A pole piece film manufacturing apparatus according to claim 1, characterized in that the rolling structure (3) comprises a cooling rolling assembly (31), a first adjustable rolling assembly (32), a force expanding roller (33) and a second adjustable rolling assembly (34) arranged in sequence on the frame (1).

3. A pole piece film production apparatus according to claim 2, wherein the cooling roll pressing assembly (31) comprises a first cooling roll (311) and a second cooling roll (312) rotatably connected to the frame (1), the axes of the first cooling roll (311) and the second cooling roll (312) are located at the same horizontal plane, and the sheet extrusion die head (24) is oriented to the first cooling roll (311).

4. A pole piece film manufacturing apparatus according to claim 3, wherein the cooling roller assembly (31) further comprises a first adjusting cylinder (313) for driving the second cooling roller (312) to move, the frame (1) is slidably connected with a moving slide plate, the second cooling roller (312) is mounted on the moving slide plate, the moving slide plate is connected with an output end of the first adjusting cylinder (313), and the second cooling roller (312) is driven by the first adjusting cylinder (313) to move towards or away from the first cooling roller (311).

5. The pole piece film manufacturing apparatus of claim 2, wherein the first adjustable roll assembly (32) includes a first upper roll assembly (321) and a first lower roll assembly (322), the first upper roll assembly (321) includes a main roll (3211), a front inlet roll (3212), a rear outlet roll (3213), an upper tensioning roll (3214) and an upper steel strip (3215) rotatably connected to the frame (1), the upper steel strip (3215) is wrapped around the main roll (3211), the front inlet roll (3212), the rear outlet roll (3213) and the upper tensioning roll (3214); the first lower roller assembly (322) comprises a lifting slide plate (3221) which is in sliding connection with the frame (1), wherein the lifting slide plate (3221) is rotationally connected with a movable roller (3222), a lower front guiding-in roller (3223), a lower guiding-out roller (3224), a lower tensioning roller (3225) and a lower steel belt (3226), and the lower steel belt (3226) is wrapped on the movable roller (3222), the lower front guiding-in roller (3223), the lower guiding-out roller (3224) and the lower tensioning roller (3225).

6. A pole piece film manufacturing apparatus according to claim 5, wherein the first adjustable roller assembly (32) further comprises a second adjustment cylinder (323) for driving the lifting slide plate (3221), the lifting slide plate (3221) is connected to an output end of the second adjustment cylinder (323), and the lifting slide plate (3221) is driven by the second adjustment cylinder (323) to move in a direction approaching or moving away from the first upper roller assembly (321).

7. A pole piece film preparation device according to any one of claims 1-6, further comprising a detection structure (4) arranged between the rolling structure (3) and the winding structure (5), wherein the detection structure (4) comprises two groups of soft press rollers (41) rotatably connected to the frame (1), and a laser displacement sensing assembly (42) for detecting the thickness of the pole piece film is arranged between the two groups of soft press rollers (41).

8. A pole piece film production device according to claim 7, characterized in that the winding structure (5) comprises a trimming cutter (51) and a winding roller (52) arranged on the frame (1).