CN220189694U - Pole piece preparation device - Google Patents

Abstract

The utility model relates to the technical field of battery equipment, and discloses a pole piece preparation device, which comprises: the traction assembly is suitable for traction of the pole piece substrate to move along a preset direction; the first press roll assembly comprises a plurality of press rolls which are sequentially and tangentially arranged, the connecting line of the axes of the plurality of press rolls is a broken line, and the first press roll assembly is suitable for rolling powder added to the press rolls into a first film and conveying the first film to the first side of the pole piece substrate; the second compression roller assembly is arranged opposite to the first compression roller assembly, the pole piece substrate is suitable for being pressed between the second compression roller assembly and the first compression roller assembly, and the second compression roller assembly and the first compression roller assembly are mutually extruded so that the first film is attached to the first side of the pole piece substrate. The first film is attached to the pole piece substrate through the first compression roller assembly and the second compression roller assembly, and the connecting line of the axes of the compression rollers in the first compression roller assembly is a broken line, so that the arrangement length of the first compression roller assembly is shortened, and the occupied area is reduced.

Description

Pole piece preparation device

Technical Field

The utility model relates to the technical field of battery equipment, in particular to a pole piece preparation device.

Background

The pole piece processing process can be classified into a wet process and a dry process according to whether a solvent is used. In the process of preparing the pole piece by the traditional wet process, a large amount of solvent in the battery slurry is required to be heated and dried, so that the method has huge power consumption and time consumption. The dry process is theoretically free from adding solvents, and the premixed powder is rolled into a film, so that the electric energy consumption and time consumption required by solvent drying are saved, and the production cost can be reduced theoretically.

However, in the dry method technology in the prior art, in order to ensure uniformity after film formation by rolling, a plurality of press rollers are often required to be arranged, so that the length along the arrangement direction of the plurality of press rollers is too long, and the conditions of large occupied area and inconvenient equipment use exist.

Disclosure of Invention

In view of the above, the utility model provides a pole piece preparation device to solve the problem of large occupied area of the pole piece preparation device in the prior art.

The utility model provides a pole piece preparation device, which comprises: the traction assembly is suitable for traction of the pole piece substrate to move along a preset direction; the first press roll assembly comprises a plurality of press rolls which are sequentially and tangentially arranged, the connecting lines of the axes of the plurality of press rolls are fold lines, and the first press roll assembly is suitable for rolling powder added to the press rolls into a first film and conveying the first film to the first side of the pole piece substrate; the second compression roller assembly is arranged opposite to the first compression roller assembly, the second compression roller assembly is suitable for pressing the pole piece substrate between the second compression roller assembly and the first compression roller assembly, and the second compression roller assembly and the first compression roller assembly are mutually extruded so that the first film is attached to the first side of the pole piece substrate.

The beneficial effects are that: the powder is rolled into the first film by arranging the first press roller assembly, the uniformity of the first film is improved by arranging a plurality of press rollers to realize multiple times of rolling, the first film and the pole piece substrate are extruded by the first press roller assembly and the second press roller assembly, and the first film is attached to the pole piece substrate, so that a pole piece is formed, the traditional step of preparing the self-supporting film is reduced in the preparation process, the pole piece is directly produced, the process steps are simplified, the production difficulty is reduced, and the production efficiency is improved; in addition, the arrangement length of the first press roller assembly along the plane perpendicular to the pole piece substrate can be shortened by arranging the connecting lines of the axes of the plurality of press rollers in the first press roller assembly to be a fold line, so that the occupied space is reduced, the preparation difficulty and the cost of the device are reduced, and the site limitation is reduced; meanwhile, the traction assembly is arranged to traction the pole piece substrate to move along the preset direction, so that the first film is continuously transferred to the first side of the pole piece substrate, the production efficiency of the pole piece can be greatly improved, the first film formed by sequentially rolling powder through a plurality of compression rollers is good in continuity, the phenomena of uneven inside and holes on the surface of the first film can be avoided, the quality of the pole piece is improved, and the large-scale application and popularization are facilitated.

In an alternative embodiment, the first press roll assembly is provided with M rows of press rolls along the preset direction, each row of press rolls includes at least two press rolls arranged along the first direction, a first press roll of the M rows of press rolls is tangential to a last press roll of the M-1 rows of press rolls, and a connection line between an axle center of the first press roll of the M rows of press rolls and an axle center of the last press roll of the M-1 rows of press rolls is parallel to the preset direction, wherein the first direction is perpendicular to the preset direction, M is a positive integer, and M is greater than or equal to 2.

The beneficial effects are that: through setting up first compression roller subassembly to the M row, the range direction of every row compression roller is perpendicular with the direction of predetermineeing, and adjacent two rows of compression rollers are partly coincide in first direction, realize that the line of axle center of a plurality of compression rollers in the first compression roller subassembly is the broken line setting, and through setting up the axle center line of first compression roller in a certain row compression roller and last compression roller in the preceding row compression roller and predetermineeing the direction to be parallel, realize that the axle center line of a plurality of compression rollers in the first compression roller subassembly is each line segment mutually perpendicular's broken line type, the arrangement and the atress of compression roller of being convenient for are favorable to reducing the length of first compression roller subassembly along first direction, improve space utilization.

In an alternative embodiment, the pole piece preparation device further comprises: the pressing assembly comprises two pressing parts, wherein the two pressing parts are arranged on two sides of the pressing roller in the same row along the first direction, and/or the two pressing parts are arranged on two sides of the pressing roller in the same row along the preset direction so as to adjust the gap and the pressure between the adjacent pressing rollers.

The beneficial effects are that: the two pressurizing parts are arranged on two sides of the same row of press rollers along the first direction so as to adjust the gap and the pressure between the adjacent press rollers in the same row of press rollers, so that the pressure between the press rollers in each row is controllable; the two pressurizing parts are arranged on two sides of the same row of press rollers along the preset direction so as to adjust the gap and pressure between the adjacent press rollers in the same row of press rollers, so that the pressure between the press rollers in each row is controllable, and the adjustment flexibility is improved.

In an alternative embodiment, the first film is sequentially transferred along the surfaces of the plurality of press rolls of the first press roll assembly, and the gap between two adjacent press rolls is sequentially reduced in the transfer direction along the first film.

The beneficial effects are that: through setting up the clearance between two adjacent compression rollers along the transmission direction of first film and reduce in proper order for first film thickness attenuate to the target value step by step, the variation that first film thickness reduces gradually can guarantee that the extrusion force of the compression roller that first film received in the shaping in-process increases gradually, avoids the difference between two clearances too big, thereby avoids first film thickness to change too big, the pressure abrupt change that first film received leads to first film breakage damage, thereby improves the quality of first film, guarantees the quality of pole piece and battery in the follow-up production.

In an alternative embodiment, the first press roll assembly further comprises: and the first guide part is arranged above a gap formed between the two compression rollers which are far away from the pole piece substrate in the first compression roller assembly so as to provide guide for the powder.

The beneficial effects are that: through set up first guiding portion in the top in the gap that forms between two compression rollers, the powder passes through the direction and the limiting displacement of first guiding portion, adds to between two compression rollers along first guiding portion, prevents that the powder from scattering, material cost saving can also keep the environment clean and tidy.

In an alternative embodiment, the traction assembly comprises a first roller and a second roller, the second roller being arranged downstream of the first roller in the preset direction, the first roller being adapted to pay out the pole piece matrix, the second roller being adapted to wind up the pole piece matrix.

The beneficial effects are that: through the cooperation of second cylinder and first cylinder, realize drawing the pole piece base member by first cylinder towards the second cylinder removal to because the cylinder can coil the pole piece base member, consequently practice thrift the space, be convenient for operate.

In an alternative embodiment, the second press roll assembly is a first press roll, and the first press roll is pressed against one of the first press roll assemblies adjacent to the pole piece substrate.

The beneficial effects are that: the surface of a compression roller close to the pole piece matrix is attached with a first film, the pole piece matrix is located between the compression roller and the first extrusion roller, and the first film can be transferred onto the pole piece matrix through rolling, so that the pole piece is obtained, the second compression roller assembly is arranged into a structural form of the extrusion roller, and the pole piece is convenient to set and low in cost.

In an alternative embodiment, the first press roll assembly is adapted to apply the first film to the first surface of the pole piece substrate, and the pole piece preparation device further comprises: the third compression roller assembly and the second compression roller are oppositely arranged, the third compression roller assembly and the second compression roller are arranged at the downstream of the first compression roller assembly, the pole piece substrate is suitable for being pressed between the third compression roller assembly and the second compression roller, the third compression roller assembly is arranged at the second side of the pole piece substrate, the third compression roller assembly is suitable for rolling powder into a second film and conveying the second film to the second surface of the pole piece substrate, and the third compression roller assembly and the second compression roller are mutually extruded so that the second film is attached to the second surface of the pole piece substrate.

The beneficial effects are that: through setting up third compression roller subassembly and second squeeze roller in the low reaches of first compression roller subassembly to laminate the second film that forms by the powder roll-in to the surface that does not laminate with first film on the pole piece base member, obtain the pole piece that both sides all laminate and have electrode material layer, promptly through first compression roller subassembly and first squeeze roller cooperation, third compression roller subassembly and second squeeze roller complex simultaneous working, realize accomplishing the processing of two-sided pole piece on a production line, compare with only first compression roller subassembly and first squeeze roller complex structure, need not to transfer again and change the pole volume, convenient operation has improved production efficiency.

In an alternative embodiment, the second press roll assembly comprises a plurality of press rolls which are arranged in a tangent manner in sequence, the second press roll assembly is suitable for rolling powder added to the press rolls into a second film and conveying the second film to the second side of the pole piece substrate, and the second press roll assembly and the first press roll assembly are mutually extruded so that the second film is attached to the second side of the pole piece substrate.

The beneficial effects are that: the first compression roller assembly and the second compression roller assembly are respectively arranged on two opposite sides of the pole piece substrate, the first compression roller assembly and the second compression roller assembly are mutually extruded, the first compression roller assembly is suitable for conveying and attaching a first film to the first surface of the pole piece substrate, the second compression roller assembly is suitable for conveying and attaching a second film to the second surface of the pole piece substrate, and therefore the device capable of realizing the transfer of powder on two sides of the pole piece substrate is formed, electrode material layers can be attached to two sides of the pole piece substrate at the same time, and therefore a double-sided pole piece is obtained at one time, production and manufacturing period can be effectively shortened, production efficiency is improved, cost is reduced, and occupied space of the whole device is further reduced.

In an alternative embodiment, the second press roll assembly and the first press roll assembly are symmetrically arranged with respect to the pole piece base body.

The beneficial effects are that: the symmetrical structure is convenient to arrange and operate, and the stress on the two sides of the pole piece substrate is uniform, so that the quality of the pole piece is improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural view of a pole piece manufacturing device according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a pole piece preparation apparatus shown in FIG. 1 for preparing a double-sided pole piece;

FIG. 3 is a schematic structural view of another pole piece manufacturing apparatus according to an embodiment of the present utility model;

FIG. 4 is a schematic structural view of a pole piece manufacturing apparatus according to an embodiment of the present utility model;

FIG. 5 is a schematic structural view of a single-sided pole piece according to an embodiment of the present utility model;

Fig. 6 is a schematic structural diagram of a double-sided pole piece according to an embodiment of the present utility model.

Reference numerals illustrate:

101. a first press roller; 102. a second press roller; 103. a third press roller; 104. a fourth press roller; 105. a fifth press roller; 106. a sixth press roller; 201. a seventh press roller; 202. an eighth press roller; 203. a ninth press roller; 204. a tenth press roll; 205. an eleventh pressing roller; 206. a twelfth press roll; 301. a thirteenth press roll; 302. a fourteenth press roller; 303. a fifteenth press roll; 304. sixteenth press roller; 305. seventeenth press roller; 306. an eighteenth press roller; 401. a first guide part; 402. a second guide part; 5. a pressurizing section; 601. a first squeeze roll; 602. a second squeeze roll; 701. a first steering roller; 702. a second steering roller; 703. a third steering roller; 704. a fourth steering roller; 801. a current collector roll; 802. a single-sided pole roll; 803. a double-sided pole roll; 901. a current collector; 902. a single-sided pole piece; 903. double-sided pole pieces; 904. and an electrode material layer.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The pole piece processing process can be classified into a wet process and a dry process according to whether a solvent is used. The most common slurry coating process at present is a traditional wet process, which is to uniformly mix an electrode active material, a conductive agent and a binder to prepare a liquid battery slurry mixture, and then coat the slurry mixture on a current collector to form a pole piece, wherein in order to ensure the fluidity of the battery slurry, the solvent content of the battery slurry is generally above 40%. The process of preparing the pole piece by the traditional coating process is also a process of heating and drying a large amount of solvent, which consumes huge electric energy, and the process time of waiting for solvent evaporation is longer, so that the production efficiency of the coating process is low. The dry process theory does not need to add any solvent, the pole piece self-supporting film can be prepared only through the fibrosis of the dry binder under the condition of no solvent, and the pole piece self-supporting film and the current collector are subjected to hot-pressing compounding to obtain the dry electrode pole piece. The process for preparing the pole piece film by the dry method does not need complex coating equipment, and the pole piece can be prepared only by continuous heating and rolling, however, the self-supporting film in the dry method technology needs to have certain strength, has higher requirements on the fibrosis of the adhesive, and has more complex process for preparing the self-supporting film, so that the production difficulty of the dry method technology is high, the production efficiency is difficult to further improve, the large-scale application is difficult to realize, and the advantage of reducing the production cost is lost; moreover, the membrane obtained by dry molding often has the phenomena of uneven inside and holes on the surface of the membrane, resulting in poor quality of the pole piece.

Embodiments of the present utility model are described below with reference to fig. 1 to 6.

According to an embodiment of the present utility model, there is provided a pole piece manufacturing apparatus, as shown in fig. 1 to 4, including: the device comprises a traction assembly, a first compression roller assembly and a second compression roller assembly. The traction component is suitable for traction of the pole piece substrate to move along a preset direction; the first press roller assembly comprises a plurality of press rollers which are sequentially and tangentially arranged, the connecting line of the axes of the plurality of press rollers is a broken line, and the first press roller assembly is suitable for pressing powder added to the press rollers into a first film and conveying the first film to the first side of the pole piece substrate; the second compression roller assembly is arranged opposite to the first compression roller assembly, the pole piece substrate is suitable to be pressed between the second compression roller assembly and the first compression roller assembly, and the second compression roller assembly and the first compression roller assembly are mutually extruded, so that the first film is attached to the first side of the pole piece substrate. Wherein, the preset direction refers to a preset direction indicated by an arrow in fig. 1 to 4; the arrangement of the second compression roller assembly opposite to the first compression roller assembly means that the second compression roller assembly and the first compression roller assembly are arranged on different sides of the pole piece substrate and are correspondingly arranged.

By using the pole piece preparation device, powder is rolled into the first film through the first press roller assembly, the uniformity of the first film is improved through the plurality of press rollers, the first film and the pole piece substrate are extruded through the first press roller assembly and the second press roller assembly, and the first film is attached to the pole piece substrate, so that the pole piece is formed, the traditional step of preparing the self-supporting film is reduced in the preparation process, the pole piece is directly produced, the process steps are simplified, the production difficulty is reduced, and the production efficiency is improved; in addition, the arrangement length of the first press roller assembly along the plane perpendicular to the pole piece substrate can be shortened by arranging the connecting lines of the axes of the plurality of press rollers in the first press roller assembly to be a fold line, so that the occupied space is reduced, the preparation difficulty and the cost of the device are reduced, and the site limitation is reduced; meanwhile, the traction assembly is arranged to traction the pole piece substrate to move along the preset direction, so that the first film is continuously transferred to the first side of the pole piece substrate, the production efficiency of the pole piece can be greatly improved, the first film formed by sequentially rolling powder through a plurality of compression rollers is good in continuity, the phenomena of uneven inside and holes on the surface of the first film can be avoided, the quality of the pole piece is improved, and the large-scale application and popularization are facilitated.

The pole piece substrate is used for bearing the first film, the first film is attached to the pole piece substrate to form a pole piece, and the pole piece is used for assembling the battery. Specifically, the pole piece substrate may be a current collector 901, and after rolling of the first compression roller assembly and the second compression roller assembly, a single-sided pole piece 902 with a first film adhered to one side is obtained; the pole piece substrate may also be a single-sided pole piece 902 with a first film adhered to one side, and the single-sided pole piece 902 is rolled by a first compression roller assembly and a second compression roller assembly to obtain a double-sided pole piece 903 with films adhered to both sides.

Preferably, the powder is a fiberized powder, the fiberized powder is a mixture of active material powder and fiber, wherein the active material is an anode active material or a cathode active material, the fiber is a polymer and is in a grid shape so as to be convenient for molding, the active material powder and the fiber form a substrate to support the active material after being rolled together, thereby forming a first film, and the first film formed after being rolled by a plurality of press rolls has a uniform structure. The fiber powder is used, so that the wire drawing strength requirement of the adhesive added into the powder is reduced, the variety of the usable adhesive is increased, and the selection is convenient; in addition, the step of preparing the self-supporting film in the prior art can be skipped by roll forming the mixed powder, so that the electrode can be directly produced, and the production efficiency can be greatly improved.

In one embodiment, the first press roll assembly is provided with M rows of press rolls along a preset direction, each row of press rolls comprises at least two press rolls arranged along a first direction, a first press roll of the M rows of press rolls is tangent to a last press roll of the M-1 rows of press rolls, a connecting line of the axle center of the first press roll of the M rows of press rolls and the axle center of the last press roll of the M-1 rows of press rolls is parallel to the preset direction, wherein the first direction is perpendicular to the preset direction, M is a positive integer, and M is more than or equal to 2. Wherein the first direction refers to a "first direction" indicated by an arrow in fig. 1 to 4, the first direction being perpendicular to a plane in which a pole piece substrate held between the first press roller assembly and the second press roller assembly is located; the first press roller in each row of press rollers refers to the press roller farthest from the pole piece substrate in the row of press rollers, and the last press roller in each row of press rollers refers to the press roller closest to the pole piece substrate in the row of press rollers; along the preset direction indicated by the arrow in fig. 1 to 4, the pressing rollers of the M-th row, the pressing rollers of the M-1 th row, the pressing rollers of the … … th row and the pressing rollers of the first row are sequentially arranged. Through setting up first compression roller subassembly to the M row, the range direction of every row compression roller is perpendicular with the direction of predetermineeing, and adjacent two rows of compression rollers are partly coincide in first direction, realize that the line of axle center of a plurality of compression rollers in the first compression roller subassembly is the broken line setting, and through setting up the axle center line of first compression roller in a certain row compression roller and last compression roller in the preceding row compression roller and predetermineeing the direction to be parallel, realize that the axle center line of a plurality of compression rollers in the first compression roller subassembly is each line segment mutually perpendicular's broken line type, the arrangement and the atress of compression roller of being convenient for are favorable to reducing the length of first compression roller subassembly along first direction, improve space utilization.

It should be noted that, the M rows of press rollers are arranged along the preset direction, so that the first press roller assembly occupies a certain size along the preset direction, but because the preset direction is the moving direction of the pole piece substrate, a longer distance is required, and the distance is enough to arrange the first press roller assembly, even if the first press roller assembly occupies a certain size along the M direction, the length of the whole pole piece preparation device along the preset direction is not increased, and the space utilization rate of the whole device can be improved by reducing the length of the first press roller assembly along the first direction.

Specifically, the rotation directions of two adjacent compression rollers in the first compression roller assembly are opposite, the rotation direction of each compression roller is shown by an arrow on the compression roller in fig. 1-4, the powder is sequentially transferred on the surfaces of the compression rollers by sequentially arranging a plurality of compression rollers in a tangential manner and the rotation directions of the two adjacent compression rollers are opposite, and the first film is transferred to the pole piece substrate by the matched rolling of the first compression roller assembly and the second compression roller assembly.

Specifically, the number of the press rolls in the first press roll assembly is N, and the first press roll 101, the second press roll 102, the third press roll 103, … … and the nth press roll are sequentially arranged along the transmission direction of the first film, wherein N is a positive integer, the first press roll 101 is one press roll farthest from the pole piece substrate in the first row of press rolls, and the nth press roll is one press roll closest to the pole piece substrate in the M row of press rolls. Preferably, the number of the press rolls in the first press roll assembly is six, namely a first press roll 101, a second press roll 102, a third press roll 103, a fourth press roll 104, a fifth press roll 105 and a sixth press roll 106 in sequence, wherein the sixth press roll 106 is in contact with the first side of the pole piece substrate, and the six press rolls can ensure that powder is fully rolled to form a first film with uniform structure, and can avoid the problem of overlarge device volume caused by overlarge number of press rolls, so that the occupied area and the cost are reduced while the production quality is ensured.

In one embodiment, the pole piece preparation device further comprises: the pressing assembly comprises two pressing parts 5, and the two pressing parts 5 are arranged on two sides of the same row of pressing rollers along the first direction so as to adjust gaps and pressures between adjacent pressing rollers in the same row of pressing rollers, so that the pressure between the pressing rollers in each row is controllable, and the adjustment flexibility is improved. It should be noted that, the first press roller assembly is located at the first side of the pole piece base body, for the 1 st row to the M-1 st row of press rollers, no press roller is in direct contact with the pole piece base body, and two press rollers in the corresponding press assemblies are located at the first side of the pole piece base body; for the compression roller of the Mth row, one compression roller close to the pole piece substrate contacts with the pole piece substrate, so that only one compression part 5 in the compression assembly is positioned on the first side of the pole piece substrate, and simultaneously, the compression assembly is matched with one compression part 5 positioned on the second side of the pole piece substrate, and the compression assembly is used for simultaneously compressing the compression roller of the Mth row and the compression roller of the second compression roller assembly, which are positioned on the same row with the compression roller of the Mth row, so that the compression of the compression roller of the Mth row is realized.

In one embodiment, the two pressing portions 5 are disposed on two sides of the same row of pressing rollers along a preset direction, so as to adjust a gap and pressure between adjacent pressing rollers in the same row of pressing rollers, so that the pressure between the pressing rollers in each row is controllable, and the adjustment flexibility is improved. The same row of press rollers refer to press rollers with axes on a connecting line parallel to a preset direction, and specifically can be a first press roller of an Mth row of press rollers and a last press roller of an M-1 th row of press rollers.

In one embodiment, the pressurizing assemblies are arranged on two sides of each row of press rollers and two sides of each column of press rollers, so that gaps and pressures between the press rollers can be adjusted according to actual requirements, the pressures between the press rollers in each row and each column are controllable, the adjusting flexibility is improved, and the processing quality of the first film is improved.

In addition, in other embodiments, the pressurizing assemblies may be disposed only on two sides of each row of press rollers, or the pressurizing assemblies may be disposed only on two sides of each column of press rollers, so as to adjust the gap and pressure between the same row or column of press rollers.

Preferably, each row of press rollers comprises two press rollers, so that the first press roller assembly can be guaranteed to realize the folded line type arrangement, the number of press rollers in each row of press rollers is reduced as much as possible, and the two sides of each row of two press rollers are provided with pressurizing assemblies, so that independent control of gaps and pressures between every two press rollers is realized, the situation that the number of press rollers in the same row is too large to realize independent regulation of pressures between every two adjacent press rollers is avoided, the mutual influence among a plurality of press rollers is avoided, the convenience of pressurizing regulation is improved, and the processing quality of a first film is improved.

In one embodiment, the first film is sequentially transferred along the surfaces of the plurality of rolls of the first roll assembly, and the gap between adjacent two rolls is sequentially reduced in the transfer direction along the first film. Specifically, the gap between the first press roller 101 and the second press roller 102 is a first gap, the gap between the second press roller 102 and the third press roller 103 is a second gap, the gap between the third press roller 103 and the fourth press roller 104 is a third gap, … …, the first gap is larger than the second gap, the second gap is larger than the third gap, … …, and so on. Because the powder added between the two compression rollers is rolled to obtain the first film, the thickness of the first film is determined by the gap between the two compression rollers, the gap between the two adjacent compression rollers along the transmission direction of the first film is sequentially reduced, the thickness of the first film is gradually reduced to a target value, the extrusion force of the compression rollers, which is born by the first film in the forming process, can be gradually increased by the change mode of gradually reducing the thickness of the first film, the difference between the two gaps is avoided to be too large, and the first film is prevented from being broken and damaged due to the sudden change of the pressure, which is born by the first film, so that the quality of the first film is improved, and the quality of pole pieces and batteries in subsequent production is ensured.

The gap between adjacent press rolls is adjusted by the pressing assembly to produce a first film thickness that meets the requirements. Specifically, the gap between two adjacent press rolls is 0-5mm, the pressure between two adjacent press rolls is 1-15 tons, and the gap and the pressure between every two press rolls in the first press roll assembly are independently controllable.

In one embodiment, the rotational speed of each press roll is from low to high in the direction of transfer along the first film. It should be noted that, in the transfer direction along the first film, the rotation speed of the latter press roller is greater than the rotation speed of the former press roller, and the rotation speed presents an increasing trend, so that the first film on the surface of the former press roller is transferred to the surface of the latter press roller through the linear speed difference between the two adjacent press rollers, and the higher the rotation speed of the press roller, the more the powder is attached to the press roller, which is more beneficial to the gradual thinning of the thickness of the first film. Specifically, the rotation speed of each press roller ranges from 1 to 10m/min, the rotation speed of the second press roller 102 is greater than that of the first press roller 101, and the rotation speed of the third press roller 103 is greater than that of the second press roller 102, … ….

In one embodiment, the press rolls are thermal composite rolls, and the temperature between two adjacent press rolls is from low to high in the direction of transfer along the first film. It should be noted that, the compression roller can be a thermal composite roller, has certain temperature on the compression roller, can carry out the heating of certain degree to the powder, and the higher the temperature, the softer the powder is, is favorable to the extrusion of first film and the laminating of powder and compression roller more, through setting up the temperature of each compression roller along the transmission direction of first film and rising gradually, is convenient for realize the attenuate step by step of first film, improves the homogeneity of first film. Specifically, the temperature between two adjacent press rolls ranges from 50 ℃ to 200 ℃.

In one embodiment, the roughness of each press roll increases from low to high along the direction of transfer of the first film. It should be noted that, the higher the roughness of compression roller surface, the more laminating of the surface of first film and compression roller, through setting up the roughness of each compression roller in the transmission direction along first film and increasing gradually, be favorable to guaranteeing the laminating gradually of first film and compression roller, avoid first film to drop from the compression roller in the transmission process. Specifically, the roughness of the press roller is in the range of 0.4-1.6 μm.

In one embodiment, the first press roll assembly further comprises: the first guiding part 401 is arranged above a gap formed between two pressing rollers of the first pressing roller assembly, which are far away from the pole piece base body, so as to provide guiding for powder. Through setting up first guiding portion 401 in the top of the gap that forms between two compression rollers, the powder passes through the direction and the spacing effect of first guiding portion 401, adds between two compression rollers along first guiding portion 401, prevents that the powder from scattering, material cost saving can also keep the environment clean and tidy. Specifically, the first guide 401 is provided above the gap formed between the first press roller 101 and the second press roller 102, and the powder is added between the first press roller 101 and the second press roller 102 by the guide of the first guide 401.

In one embodiment, the traction assembly comprises a first roller and a second roller, the second roller being arranged downstream of the first roller in a preset direction, the first roller being adapted to pay out the pole piece matrix, the second roller being adapted to wind up the pole piece matrix. Through the cooperation of second cylinder and first cylinder, realize drawing the pole piece base member by first cylinder towards the second cylinder removal to because the cylinder can coil the pole piece base member, consequently practice thrift the space, be convenient for operate.

In one embodiment, further referring to fig. 1, the pole piece substrate is a current collector 901, the first roller is adapted to mount the current collector roll 801, the current collector roll 801 discharges the current collector 901, the current collector 901 passes between the first press roller assembly and the second press roller assembly, the first press roller assembly and the second press roller assembly roll the current collector 901, a first film on the first press roller assembly is transferred to a first surface of the current collector 901 to form a single-sided pole piece 902, and the second roller is adapted to wind the single-sided pole piece 902 to obtain the single-sided pole roll 802. Wherein the first surface refers to one surface of the current collector 901 facing the first press roll assembly; the single-sided electrode sheet 902 is a structure in which an electrode material layer 904 is bonded to one surface of the current collector 901, and can be used as a sheet substrate for subsequent processing of the double-sided electrode sheet 903. As shown in fig. 5 to 6, the single-sided electrode sheet 902 includes a current collector 901 and an electrode material layer 904 adhered to one side of the current collector 901, and the double-sided electrode sheet 903 includes the current collector 901 and the electrode material layers 904 adhered to both sides of the current collector 901, wherein the electrode material layer 904 is a first thin film.

In an alternative embodiment, further referring to fig. 2, the pole piece substrate is a single-sided pole piece 902 with a first film attached to one side of the current collector 901, a single-sided pole roll 802 is adapted to be mounted on a first roller, the single-sided pole roll 802 pays out the single-sided pole piece 902, one surface of the single-sided pole piece 902 without the first film faces a first press roller assembly, the first press roller assembly attaches the first film to the single-sided pole piece 902 in cooperation with a second press roller assembly to form a double-sided pole piece 903, and the second roller is adapted to wind the double-sided pole piece 903 to obtain the double-sided pole roll 803. The double-sided pole piece 903 can be used to assemble a battery after further cutting.

Specifically, the current collector 901 may be an anode current collector, the material of the anode current collector is aluminum mesh or aluminum foil, correspondingly, the active material in the powder added to the first compression roller assembly is an anode active material, and the formed double-sided pole piece 903 is an anode piece; it will be appreciated that, as an alternative embodiment, the current collector 901 may also be a negative current collector, the negative current collector being a copper mesh or foil, and correspondingly, the active material in the powder added to the first press roll assembly being a negative active material, the formed double-sided sheet 903 being a negative sheet.

In one embodiment, as shown in fig. 1-2, the second press roll assembly is a first press roll 601, and the first press roll 601 is pressed against one of the first press roll assemblies adjacent to the pole piece substrate. The surface of a compression roller close to the pole piece matrix is attached with a first film, the pole piece matrix is located between the compression roller and the first squeeze roller 601, and the first film can be transferred onto the pole piece matrix through rolling, so that the pole piece is obtained, the second compression roller assembly is arranged into a squeeze roller in a simpler structure, and the pole piece is convenient to set and low in cost. It should be noted that, the pole piece substrate is specially treated, and compared with the surface of the press roller, the adhesive force between the pole piece substrate and the first film formed by the powder is higher, and meanwhile, the press roller pressure between the press roller close to the pole piece substrate and the first squeeze roller 601 is matched, so that the first film on the press roller can be smoothly transferred onto the pole piece substrate. Specifically, the first press roller assembly includes six press rollers, and then the sixth press roller 106 is a press roller close to the pole piece substrate, the sixth press roller 106 and the first press roller 601 are pressed mutually, and the rotation directions of the sixth press roller 106 and the first press roller 601 are opposite and the rotation speeds are equal.

Specifically, using the pole piece manufacturing apparatus as shown in fig. 1 and 2, the electrode material layer 904 can be attached to one side of the pole piece substrate at a time, and the process of producing the double-sided pole roll 803 using the apparatus is as follows: firstly, a current collector roll 801 is arranged on a first roller, a first film prepared by a first compression roller assembly is attached to the current collector 901 under the cooperation of the first compression roller assembly and a first extrusion roller 601 to obtain a single-sided pole piece 902, and the single-sided pole piece 902 is wound on a second roller to obtain a single-sided pole roll 802; then, the current collector roll 801 on the first roller is removed, the single-sided pole roll 802 on the second roller is removed, the single-sided pole roll 802 removed from the second roller is mounted on the first roller, the side, which is not attached with the first film, of the single-sided pole piece 902 released by the single-sided pole roll 802 faces the first press roller assembly, the first film is attached to the side, which is not attached with the first film, of the single-sided pole roll 802 through the cooperation of the first press roller assembly and the first press roller 601, and therefore the double-sided pole piece 903 is obtained, and the double-sided pole piece 903 is wound on the second roller to obtain the double-sided pole roll 803. The pole piece preparation device of the embodiment is simple to manufacture, small in use field, high in economy and high in production efficiency.

In one embodiment, as shown in fig. 3, the first press roller assembly is disposed on a first side of the pole piece substrate, the first press roller assembly is adapted to apply a first film to a first surface of the pole piece substrate, and the pole piece preparation device further includes: the third compression roller assembly and the second squeeze roller 602 that set up relatively, third compression roller assembly and second squeeze roller 602 set up the low reaches at first compression roller assembly, be suitable for between third compression roller assembly and the second squeeze roller 602 and hold the pole piece base member, third compression roller assembly sets up the second side at the pole piece base member, third compression roller assembly is suitable for with powder roll-in second film and convey the second film to the second surface of pole piece base member, third compression roller assembly extrudees each other with second squeeze roller 602 to make the laminating of second film at the second surface of pole piece base member. Through set up third compression roller subassembly and second squeeze roller 602 in the low reaches of first compression roller subassembly to laminate the second film that forms by the powder roll-in to the surface laminating that does not laminate first film on the pole piece base member, obtain the pole piece that both sides all laminate electrode material layer 904, promptly through first compression roller subassembly and first squeeze roller 601 cooperation, third compression roller subassembly and second squeeze roller 602 complex simultaneous working, realize accomplishing the processing of two-sided pole piece 903 on a production line, compare with the structure that only has first compression roller subassembly and first squeeze roller 601 complex, need not to readjust change the change pole volume, convenient operation has improved production efficiency. Wherein, downstream refers to downstream along the moving direction of the pole piece substrate; the first side and the second side refer to opposite sides of the pole piece substrate, the first side corresponds to the first surface of the pole piece substrate, and the second side corresponds to the second surface of the pole piece substrate; a single-sided pole piece 902 held between the third press roller assembly and the second press roller 602 and output between the first press roller assembly and the first press roller 601; the second film is identical in composition and structure to the first film, but is rolled via a different roll assembly, and the electrode material layer 904 in fig. 6 may also be the second film.

Preferably, the third press roll assemblies are identical in structure and number with the first press roll assemblies, but are symmetrically arranged, the third press roll assemblies comprise a plurality of press rolls, the rotation directions of the two adjacent press rolls are opposite, the axis connecting line of the plurality of press rolls is a fold line, the thirteenth press roll 301, the fourteenth press roll 302, the fifteenth press roll 303, the sixteenth press roll 304, the seventeenth press roll 305 and the eighteenth press roll 306 are sequentially arranged along the transmission direction of the second film, the thirteenth press roll 301 is the press roll farthest from the pole piece substrate, the eighteenth press roll 306 is the press roll closest to the pole piece substrate, the eighteenth press roll 306 and the second press roll 602 are oppositely arranged at two sides of the pole piece substrate and are mutually pressed, the powder is added between the thirteenth press roll 301 and the fourteenth press roll 302, a second film is formed after being rolled, and is sequentially rolled and transmitted through each of the thirteenth press rolls 301 to the eighteenth press roll 306, and the second film is gradually transmitted to the second surface of the pole piece substrate from the position far from the pole piece substrate.

In one embodiment, the second press roll assembly further comprises: and a second guide part 402, wherein the second guide part 402 is arranged above a gap formed between two pressing rollers of the second pressing roller assembly, which are far away from the pole piece substrate, so as to provide guide for powder. Specifically, the second guide portion 402 is provided above the gap formed between the thirteenth pressing roller 301 and the fourteenth pressing roller 302, and the powder is added between the thirteenth pressing roller 301 and the fourteenth pressing roller 302 by the guide of the second guide portion 402, and is transferred along the surfaces of the fifteenth pressing roller 303, the sixteenth pressing roller 304, the seventeenth pressing roller 305, and the eighteenth pressing roller 306 in this order after being rolled. Powder is added between two compression rollers along the second guide part 402 through the guide and limiting action of the second guide part 402, so that the powder can be prevented from scattering, the material cost is saved, and the environment can be kept clean.

Preferably, for the third press roll assembly, in the transfer direction along the second film, the gap between two adjacent press rolls is sequentially reduced to achieve progressive thinning of the second film thickness; the rotation speed of each press roller is from low to high, the linear speed difference between two adjacent press rollers realizes that the second film on the surface of the previous press roller is transferred to the surface of the next press roller, and the higher the rotation speed of the press roller is, the more the powder is attached to the press roller, so that the gradual thinning of the thickness of the second film is facilitated; the temperature on each press roller is from low to high, the higher the temperature is, the softer the powder is, the more favorable for thinning the second film is, and the film is attached to the press roller; the roughness of each press roller is from low to high, and the higher the roughness is, the more the film is attached to the press roller. Thereby ensuring that the powder does not fall down in the process of conveying along the surfaces of the pressing rollers.

Preferably, both sides of each row of rolls and each column of rolls of the third roll assembly are also provided with pressurizing means (not shown in the drawings) to adjust the roll gap and pressure between adjacent rolls.

When the third press roller assembly and the second press roller 602 are disposed at the downstream of the first press roller assembly, the current collector roll 801 is mounted on the first roller of the traction assembly to discharge the current collector 901, the current collector 901 is rolled by the first press roller assembly and the first press roller 601 to obtain a single-sided pole piece 902, the single-sided pole piece 902 is rolled by the third press roller assembly and the second press roller 602 to obtain a double-sided pole piece 903, and the second roller rolls the double-sided pole piece 903 to obtain the double-sided pole piece 803.

In one embodiment, the pole piece preparation device further comprises: and the steering roller is arranged between the first compression roller assembly and the third compression roller assembly and is suitable for supporting and redirecting the pole piece substrate. The pole piece matrix bypasses the surface of the steering roller, and the stability of the pole piece matrix in the moving process is enhanced through the support and redirection of the steering roller, and the trend of the pole piece matrix can be set according to the actual field limitation, so that the field utilization rate is improved. Further referring to fig. 3, the steering rollers include a first steering roller 701, a second steering roller 702, a third steering roller 703 and a fourth steering roller 704, and under the coordination adjustment of the four steering rollers, the pole piece substrate is in a fold line shape, the overall layout is neat, the occupied space is smaller, the occupied area is saved, and the arrangement is convenient. It will be appreciated that, as an alternative embodiment, the number of the steering rollers is not limited to four, and can be flexibly set according to the actual field requirements, and the trend of the pole piece substrate can be changed accordingly.

In one embodiment, as shown in fig. 4, the second press roll assembly includes a plurality of press rolls arranged sequentially and tangentially, and is adapted to roll powder material added to the press rolls into a second film and to transfer the second film to the second side of the pole piece substrate, and the second press roll assembly is pressed against the first press roll assembly so that the second film is adhered to the second side of the pole piece substrate. The first compression roller assembly and the second compression roller assembly are respectively arranged on two opposite sides of the pole piece substrate, the first compression roller assembly and the second compression roller assembly are mutually extruded, the first compression roller assembly is suitable for conveying and attaching a first film to the first surface of the pole piece substrate, the second compression roller assembly is suitable for conveying and attaching a second film to the second surface of the pole piece substrate, and therefore the device capable of realizing the transfer of powder on two sides of the pole piece substrate is formed, and the electrode material layers 904 can be simultaneously attached to two sides of the pole piece substrate, so that the double-sided pole piece 903 is obtained at one time, the production and manufacturing period can be effectively shortened, the production efficiency is improved, the cost is reduced, and compared with the arrangement mode shown in fig. 3, the size of the whole device shown in fig. 4 in the first direction and the preset direction can be further shortened, and the occupied space of the whole device is further reduced.

In one embodiment, the second compression roller assembly and the first compression roller assembly are symmetrically arranged with respect to the pole piece substrate, the symmetrical structure is convenient to arrange, the operation is convenient, and the stress on two sides of the pole piece substrate is uniform, so that the quality of the pole piece is improved. The number of the second press roller assemblies is equal to that of the press rollers contained in the first press roller assemblies, the second press roller assemblies are structurally symmetrical with respect to the pole piece substrate, the axle center connecting lines of the plurality of press rollers in the second press roller assemblies are fold lines, and the seventh press roller 201, the eighth press roller 202, the ninth press roller 203, the tenth press roller 204, the eleventh press roller 205 and the twelfth press roller 206 are sequentially arranged along the transmission direction of the second film. Wherein the twelfth press roll 206 is attached to the second side of the pole piece base and pressed against the sixth press roll 106 in the first press roll assembly; a second guide part 402 is arranged above a gap formed between the seventh press roller 201 and the eighth press roller 202, powder is added between the seventh press roller 201 and the eighth press roller 202 through the guide of the second guide part 402, and is sequentially transferred along the surfaces of the ninth press roller 203, the tenth press roller 204, the eleventh press roller 205 and the twelfth press roller 206 after being rolled, and the first guide part 401 and the second guide part 402 are far away from each other, so that the positions of the powder added by the two press roller assemblies are far away from each other, interference is avoided, and the operation is convenient; the two sides of each row of press rolls and each column of press rolls of the second press roll assembly are also provided with a pressurizing device (not shown in the figure) so as to adjust the roll gap and the pressure between the adjacent press rolls, and simultaneously, the thicknesses of the first film and the second film can be effectively measured, and the control precision of the device is improved.

It should be noted that, when the second press roller assembly includes a plurality of press rollers that are sequentially and tangentially arranged and symmetrically arranged with the first press roller assembly, the current collector coil 801 is installed on the first roller of the traction assembly to discharge the current collector 901, the current collector 901 can obtain the double-sided pole piece 903 after being rolled by the first press roller assembly and the second press roller assembly, and the second roller rolls the double-sided pole piece 903 to obtain the double-sided pole piece coil 803. The double-sided pole roll 803 can be used for improving the compaction density through rolling equipment to meet the actual production requirement, and can be used for assembling a battery after being further cut.

In this embodiment, through setting up the multishell system of buckling, shortened equipment length, promoted the space utilization of equipment to can realize the pressure between every two adjacent compression rollers of independent control through setting up the pressurization subassembly, pressure and the clearance of two adjacent rollers are independent controllable, do not influence each other.

Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.

Claims (10)

1. A pole piece preparation device, characterized by comprising:

the traction assembly is suitable for traction of the pole piece substrate to move along a preset direction;

the first press roll assembly comprises a plurality of press rolls which are sequentially and tangentially arranged, the connecting lines of the axes of the plurality of press rolls are fold lines, and the first press roll assembly is suitable for rolling powder added to the press rolls into a first film and conveying the first film to the first side of the pole piece substrate;

the second compression roller assembly is arranged opposite to the first compression roller assembly, the second compression roller assembly is suitable for pressing the pole piece substrate between the second compression roller assembly and the first compression roller assembly, and the second compression roller assembly and the first compression roller assembly are mutually extruded so that the first film is attached to the first side of the pole piece substrate.

2. The pole piece preparation device according to claim 1, wherein the first press roller assembly is provided with M rows of press rollers along the preset direction, each row of press rollers comprises at least two press rollers arranged along the first direction, the first press roller of the M rows of press rollers is tangential to the last press roller of the M-1 row of press rollers, and a connecting line of the axle center of the first press roller of the M rows of press rollers and the axle center of the last press roller of the M-1 row of press rollers is parallel to the preset direction, wherein the first direction is perpendicular to the preset direction, M is a positive integer, and M is more than or equal to 2.

3. The pole piece preparation device of claim 2, further comprising: the pressing device comprises a plurality of groups of pressing components, wherein each group of pressing components comprises two pressing parts (5), the two pressing parts (5) are arranged on two sides of the same row of pressing rollers along the first direction, and/or the two pressing parts (5) are arranged on two sides of the same column of pressing rollers along the preset direction so as to adjust the gap and the pressure between the adjacent pressing rollers.

4. The pole piece manufacturing apparatus of claim 1, wherein the first film is sequentially transferred along surfaces of the plurality of press rolls of the first press roll assembly, and a gap between adjacent two of the press rolls is sequentially reduced in a transfer direction along the first film.

5. The pole piece manufacturing device of claim 1, wherein the first press roll assembly further comprises: and a first guide part (401), wherein the first guide part (401) is arranged above a gap formed between two compression rollers which are far away from the pole piece base body in the first compression roller assembly so as to provide guide for the powder.

6. The pole piece preparation device of claim 1, wherein the traction assembly comprises a first roller and a second roller, the second roller being disposed downstream of the first roller in the preset direction, the first roller being adapted to pay out the pole piece substrate, the second roller being adapted to wind up the pole piece substrate.

7. The pole piece preparation device according to any of claims 1 to 6, characterized in that the second press roll assembly is a first press roll (601), the first press roll (601) being pressed against one of the first press roll assemblies close to the pole piece substrate.

8. The pole piece manufacturing device of claim 7, wherein the first press roll assembly is adapted to apply the first film to the first surface of the pole piece substrate, the pole piece manufacturing device further comprising: the pole piece base body is arranged on the second side of the pole piece base body, the third pressing roller assembly is suitable for rolling powder into a second film and conveying the second film to the second surface of the pole piece base body, and the third pressing roller assembly and the second pressing roller (602) are mutually pressed to enable the second film to be attached to the second surface of the pole piece base body.

9. The pole piece preparation device according to any of the claims 1 to 6, characterized in that the second press roll assembly comprises several press rolls arranged tangentially in sequence, the second press roll assembly being adapted to roll powder material added to the press rolls into a second film and to transfer the second film to the second side of the pole piece base, the second press roll assembly being pressed against the first press roll assembly such that the second film is attached to the second side of the pole piece base.

10. The pole piece manufacturing device of claim 9, wherein the second press roll assembly and the first press roll assembly are symmetrically disposed about the pole piece base.