CN220594154U

CN220594154U - Stretching roller assembly and pole piece rolling device

Info

Publication number: CN220594154U
Application number: CN202321914440.9U
Authority: CN
Inventors: 霍雄勃; 易桂勇; 刘密; 宋鹏元
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2023-07-19
Filing date: 2023-07-19
Publication date: 2024-03-15
Anticipated expiration: 2033-07-19

Abstract

The utility model relates to a stretching roller assembly and a pole piece rolling device, wherein the stretching roller assembly comprises a tension roller, a driving piece and a detecting piece, a plurality of protruding parts are arranged on the circumferential side wall of the tension roller at intervals along the axial direction of the tension roller, a concave area is formed between two adjacent protruding parts, and the concave area is arranged corresponding to a coating area of a pole piece; the driving piece is connected with the tension roller; the detection piece is connected with the driving piece, and the detection piece is used for detecting the position of the pole piece so that the driving piece drives the tension roller to axially move along the tension roller. The stretching roller assembly detects the specific position of the pole piece through the detection piece, identifies the positions of the pole piece coating area and the empty foil area, controls the driving piece to drive the tension roller to move along the axial direction of the tension roller, and the bulge corresponds to the empty foil area, so that the stretching effect of the tension roller on the empty foil area of the pole piece is improved, the expansion difference between the empty foil area and the coating area is reduced, and the probability of wrinkling of the pole piece is reduced.

Description

Stretching roller assembly and pole piece rolling device

Technical Field

The utility model relates to the technical field of battery manufacturing equipment, in particular to a stretching roller assembly and a pole piece rolling device.

Background

The pole piece is prepared by pulping, film coating, drying, rolling, cutting and other procedures. In the coating process, a paste is coated on both sides of a current collector to form a pole piece, and in some pole pieces, a plurality of coating regions are coated on the same side of the current collector, and an empty foil region (non-coating region) is located between two adjacent coating regions. After the pole piece is formed, the pole piece is compacted through a rolling process to increase the density of the pole piece, and the step is very important for improving the energy density of the battery. Then, during the rolling process of the pole pieces, the pole pieces are pressed by the press rolls to each other, so that the coating area is stretched to a certain extent, and the empty foil area is not stretched basically. The difference in the extension of the coating area and the empty foil area of the pole piece after rolling can cause the pole piece to wrinkle. In the prior art, in order to prevent the pole piece from wrinkling after rolling, a tension roller is arranged on one side of the circumferential direction of a compression roller, and a plurality of protruding parts are arranged on the circumferential surface of the tension roller, so that the protruding parts can correspond to empty foil areas, the empty foil areas of the pole piece can be effectively expanded, and the difference of the expansion lengths of a coating area and the empty foil areas in the rolling process is reduced. The prior art has the following defects: in the process of pressing the pole piece by the pressing roller, the pole piece can be offset when being stretched, so that the protruding part of the tension roller cannot correspond to the empty foil area, and the tension roller cannot stretch the empty foil area.

Disclosure of Invention

One object of an embodiment of the utility model is to: the stretching roller assembly is simple in structure, can be used for checking and stretching the position of the pole piece, and can be used for preventing the protruding portion from being incapable of corresponding to the empty foil area due to the fact that the pole piece is deviated in the rolling process.

Another object of an embodiment of the utility model is to: the pole piece rolling device is simple in structure and capable of improving flatness of pole pieces after double rolling.

To achieve the purpose, the embodiment of the utility model adopts the following technical scheme:

in a first aspect, there is provided a stretch roll assembly for stretching a pole piece, comprising:

the tension roller is provided with a plurality of protruding parts along the axial direction at intervals on the circumferential side wall of the tension roller, a concave area is formed between two adjacent protruding parts, and the concave area is arranged corresponding to the coating area of the pole piece;

the driving piece is connected with the tension roller;

the detection piece is connected with the driving piece and used for detecting the position of the pole piece so that the driving piece drives the tension roller to move along the axial direction of the tension roller.

As a preferable scheme of the stretching roller assembly, the tension roller comprises a roller body and a roller sleeve which are detachably arranged, the roller body is connected with the driving piece, the roller sleeve is sleeved on the periphery of the roller body, and the roller sleeve is provided with the protruding part in a protruding mode.

As a preferred embodiment of the stretching roller assembly, the roller body is bonded with the roller sleeve; or alternatively, the first and second heat exchangers may be,

the roller body is connected with the roller sleeve through a threaded piece.

As a preferable mode of the tension roller assembly, the convex portion is circumferentially arranged along the tension roller.

As a preferable scheme of the stretching roller assembly, a transitional cambered surface is arranged at the joint of the convex part and the concave area; and/or the number of the groups of groups,

the end face of the suspension end of the protruding part is an arc-shaped face.

As a preferable scheme of the stretching roller assembly, the stretching roller assembly further comprises a support and a bearing piece, both ends of the tension roller are rotatably connected with the support through the bearing piece, a driving piece is connected with the support, and the driving piece drives the support to move so as to drive the tension roller to move.

As a preferable mode of the stretching roller assembly, the height of the protrusion part is 0.2mm-1mm.

In a second aspect, a pole piece rolling device is provided, including roll-in subassembly and stretching roller subassembly, the roll-in subassembly is including compression roller and the back roller of relative setting for to the pole piece is rolled in, stretching roller subassembly's tension roller is located the circumference one side of compression roller.

As a preferable scheme of the pole piece rolling device, the stretching roller assemblies are provided with two groups, and the two groups of stretching roller assemblies are positioned on two sides of the rolling assembly.

As a preferred embodiment of the pole piece rolling device, the pole piece rolling device further comprises a guiding roller, and the guiding roller is located between the rolling assembly and the tension roller.

The embodiment of the utility model has the beneficial effects that: the stretching roller assembly is provided with the driving piece and the detecting piece, so that the detecting piece can detect the specific position of the pole piece, the positions of the pole piece coating area and the empty foil area are identified, the driving piece is controlled to drive the tension roller to move along the axial direction of the tension roller, the concave area corresponds to the coating area, the convex part corresponds to the empty foil area, in other words, the convex part is inserted into the empty foil area, and the problem that the convex part cannot correspond to the empty foil area due to the deviation of the pole piece in the rolling process is prevented. The stretching effect of the tension roller on the empty foil area of the pole piece is improved, and the extension difference between the empty foil area and the coating area is reduced, so that the probability of wrinkling of the pole piece is reduced, and the flatness of the pole piece is improved.

Drawings

The utility model is described in further detail below with reference to the drawings and examples.

Fig. 1 is a schematic view of a drawing roll assembly according to an embodiment of the present utility model.

Fig. 2 is a partial schematic view of a tension roller according to an embodiment of the present utility model.

Fig. 3 is a schematic structural diagram of a pole piece rolling device according to an embodiment of the utility model.

Fig. 4 is a schematic structural view of a pole piece according to an embodiment of the present utility model.

In the figure:

100. a pole piece; 110. a coating zone; 120. an empty foil region;

1. a tension roller; 11. a roller body; 12. a roller sleeve; 121. a boss; 1211. a transitional cambered surface; 1212. an arc surface; 122. a recessed region; 2. a driving member; 3. a detecting member; 4. a screw; 5. a bracket; 51. a first support portion; 52. a second supporting part; 53. a connection part; 6. a bearing member; 7. a roll-in assembly; 71. a press roller; 72. a back roller; 8. and (5) guiding the roller.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. 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 fall within the scope of the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In order to solve the technical drawbacks, an embodiment of the present utility model discloses a stretching roller assembly, as shown in fig. 1, 2 and 4, the stretching roller assembly includes a tension roller 1, a driving member 2 and a detecting member 3, a plurality of protruding portions 121 are arranged on a circumferential side wall of the tension roller 1 along an axial direction thereof at intervals, a concave region 122 is formed between two adjacent protruding portions 121, and the concave region 122 is arranged corresponding to a coating region 110 of a pole piece 100; the driving piece 2 is connected with the tension roller 1; the detecting element 3 is connected with the driving element 2, and the detecting element 3 is used for detecting the position of the pole piece 100, so that the driving element 2 drives the tension roller 1 to move along the axial direction thereof.

The stretching roller assembly of this embodiment, through setting up driving piece 2 and detecting piece 3 to make detecting piece 3 can detect the concrete position of pole piece 100, discern the position between the coating district 110 of pole piece 100 and the empty foil district 120, with the control driving piece 2 drive stretching roller 1 along its axial displacement, make concave region 122 correspond coating district 110, protruding portion 121 corresponds empty foil district 120, in other words, protruding portion 121 can insert empty foil district 120, prevent to appear in the roll-in process pole piece 100 take place the skew and lead to protruding portion 121 and empty foil district 120 unable problem that corresponds, the tensile effect of stretching roller 1 to pole piece 100 empty foil district 120 has been improved, the difference of extension between empty foil district 120 and coating district 110 has been reduced, thereby the probability that pole piece 100 takes place the pinches has been reduced, and then the planarization of pole piece 100 has been improved.

In this embodiment, as shown in fig. 4, the pole piece 100 includes a plurality of coating areas 110 disposed at intervals, and a space foil area 120 is disposed between two adjacent coating areas 110. It will be appreciated that the coating area 110 is provided with a slurry coating layer, the empty foil area 120 is an area of the pole piece 100 where no slurry is coated, so that the coating area 110 is thicker than the empty foil area 120, and the empty foil area 120 is formed as a striped groove structure.

In the rolling process, the thickness of the coating area 110 is thicker, and the press roller 71 mechanism only rolls the coating layers on both sides of the pole piece 100, but cannot roll the empty foil area 120 with a thinner thickness. In this embodiment, the protrusion 121 of the tension roller 1 is inserted into the empty foil region 120 to stretch the empty foil region 120, so as to prevent the pole piece 100 from creasing.

It will be appreciated that the detecting element 3 is an infrared detecting device, and the infrared detecting device can identify the empty foil region 120 of the pole piece 100, calculate the specific position of the empty foil region 120, and then send a signal to the driving element 2 to control the driving element 2 to drive the tension roller 1 to move to a proper position, so that the protruding portion 121 corresponds to the empty foil region 120. It should be noted that, the detection method and the position calculation method of the detection member 3 are existing calculation, and are not described herein.

In one embodiment, as shown in fig. 1, the tension roller 1 includes a roller body 11 and a roller sleeve 12 that are detachably disposed, the roller body 11 is connected with the driving member 2, the roller sleeve 12 is sleeved on the periphery of the roller body 11, and a protruding portion 121 is protruding on the roller sleeve 12. The design can independently produce the roller body 11 and the roller sleeve 12, and simplifies the structural complexity of the tension roller 1, thereby reducing the processing difficulty. In addition, the structure can adopt different materials to produce the roller sleeve 12 and the roller body 11 according to actual requirements, for example, the roller sleeve 12 adopts plastic materials, and the roller body 11 adopts metal materials. Of course, the sleeve 12 and the body 11 may be made of the same material. The flexibility is higher and the manufacturing cost of the stretching roller assembly can be reduced.

In other embodiments, the protruding portion 121 and the tension roller 1 are integrally formed, and the integrally formed structure has high strength and is not easily damaged.

Alternatively, as shown in fig. 1, the roller body 11 and the roller sleeve 12 are connected by a screw 4. In this embodiment, the screw 4 is a bolt, the roller sleeve 12 is provided with a first mounting hole, the roller body 11 is provided with a second mounting hole corresponding to the first mounting hole, and the bolt passes through the first mounting hole and is screwed into the second mounting hole, so that the threaded connection between the roller sleeve 12 and the roller body 11 is realized, the stability of the threaded connection is higher, and the roller sleeve 12 and the roller body 11 can be prevented from sliding.

In another alternative embodiment, the roller body 11 and the roller sleeve 12 are bonded, a connecting structure is not required to be used in the design, and a mounting hole structure is not required to be arranged on the roller body 11 and the roller sleeve 12, so that the processing difficulty is reduced.

Specifically, as shown in fig. 2, the protruding portion 121 is circumferentially disposed along the tension roller 1, so that the protruding portion 121 is an annular protruding portion 121, and a continuous protruding structure is disposed on a circumferential side wall of the tension roller 1 to position the empty foil region 120 of the pole piece 100, which is beneficial to stretching the empty foil region 120 in the rotation process of the tension roller 1.

In other embodiments, the protrusions 121 are discontinuous on the tension roller 1, so that a plurality of protrusions 121 are spaced around the central axis of the roller 11 at the same axial position on the roller 11.

In some embodiments, as shown in fig. 2, the end surface of the suspended end of the protruding portion 121 is an arc-shaped surface 1212, and the suspended end of the protruding portion 121 is the end of the protruding portion 121 away from the concave region 122, so that the end of the protruding portion 121 has no corner, which not only can reduce the stress concentration of the protruding portion 121, but also can prevent the protruding portion 121 from scratching the pole piece 100.

In another embodiment, as shown in fig. 2, a transitional cambered surface 1211 is provided at the connection position of the convex portion 121 and the concave region 122, so that the local stress concentration of the tension roller 1 can be prevented. In particular, the transition surface may be rounded or chamfered.

In an alternative embodiment, as shown in fig. 1, the stretching roller assembly further includes a bracket 5 and a bearing member 6, two ends of the tension roller 1 are connected with the bracket 5 through the bearing member 6, so that the tension roller 1 can rotate along with the pole piece 100 in the rolling process of the pole piece 100, and two ends of the tension roller 1 are connected with the bearing member 6 to be limited, so that the rotation stability is higher. The driving member 2 is connected to a bracket 5. So that the driving member 2 can drive the bracket 5 to move to drive the tension roller 1 to move along the axial direction thereof.

Specifically, as shown in fig. 1, the bracket 5 is a U-shaped bracket 5, the bracket 5 includes a first supporting portion 51, a second supporting portion 52 and a connecting portion 53, the first supporting portion 51 and the second supporting portion 52 are connected by the connecting portion 53 to form a receiving groove, the tension roller 1 is located between the first supporting portion 51 and the second supporting portion 52, in other words, the tension roller 1 is located in the receiving groove, and both ends of the tension roller 1 are connected with the first supporting portion 51 and the second supporting portion 52 through bearing members 6, respectively.

Specifically, the bearing member 6 includes a bearing and a connecting shaft, one end of which is connected with the tension roller 1 and the other end of which is connected with an inner ring of the bearing, and the bracket 5 is connected with an outer ring of the bearing so that the tension roller 1 can rotate relative to the connecting shaft.

In another embodiment, the driving member is directly connected to the bearing member without the need for a U-shaped bracket. Specifically, the tension roller assembly includes a buffering limiter (not shown in the drawings), the buffering limiter is located at two sides of the tension roller 1 along the axial direction thereof with the driver 2, the driver 2 is connected with one end of the tension roller 1 through the bearing 6, the buffering limiter is connected with the other end of the tension roller 1 through the bearing 6, the buffering limiter can support one end of the tension roller far away from the driver to prevent suspension (if one of the end portions of the tension roller 1 is suspended and set up to be easily influenced by gravity to deform, thereby causing damage to the tension roller 1), so that both ends of the tension roller 1 can be supported by the supporting force. Wherein the buffer stop is provided with a buffer spring, the elastic member always has a tendency to drive the bearing member 6 to move towards the driving member 2. When the driving piece 2 drives the tension roller 1 to move towards the direction close to the buffering limiting piece, the elastic piece can buffer the pressure of the tension roller 1, and when the driving piece 2 drives the tension roller 1 to move towards the direction far away from the buffering limiting piece, the elastic piece drives the bearing piece 6 to move towards the driving piece, so that the bearing piece 6 is always abutted against the tension roller 1.

In this embodiment, the height of the protrusions 121 is 0.2mm-1mm, which is advantageous for stretching the hollow foil region 120 by the protrusions 121. Specifically, the protrusion height of the protrusion 121 may be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm.

As shown in fig. 1 and 3, the utility model also discloses a pole piece rolling device, which comprises a rolling assembly 7 and a stretching roller assembly, wherein the rolling assembly 7 comprises a pressing roller 71 and a back roller 72 which are oppositely arranged and are used for rolling a pole piece 100, and a tension roller 1 of the stretching roller assembly is positioned on one side surface of the circumferential direction of the pressing roller 71. The stretching roller assembly is provided with the driving piece 2 and the detecting piece 3, so that the detecting piece 3 can detect the specific position of the pole piece 100, the driving piece 2 is controlled to drive the tension roller 1 to axially move along the tension roller, the concave area 122 corresponds to the coating area 110, the convex part 121 corresponds to the empty foil area 120, the stretching effect of the tension roller 1 on the empty foil area 120 of the pole piece 100 is improved, the probability of wrinkling of the pole piece 100 is reduced, and the flatness of the pole piece 100 rolled by the pole piece 100 rolling device is further improved.

It will be appreciated that pole piece 100 is positioned between roll and back roll 72 and that pole piece 100 is rolled by the circumferential side walls of roll and back roll 72.

Specifically, as shown in fig. 3, the stretching roller assemblies are provided with two sets, which are located on both sides of the rolling assembly 7. One group of the pole pieces 100 is positioned on the feeding side of the rolling assembly 7, the other group of the pole pieces 100 is positioned on the discharging side of the rolling assembly 7, the pole pieces 100 to be rolled are fed into the rolling assembly 7 from the feeding side, and partial areas of the pole pieces 100 after being rolled by the rolling assembly 7 are discharged from the discharging side, so that in the rolling process, the pole pieces 100 are provided with stretching roller groups to stretch the empty foil areas 120 before and after being rolled, the stretching efficiency of the empty foil areas 120 is improved, and the flatness of the rolled pole pieces 100 is further improved.

Specifically, as shown in fig. 3, the pole piece 100 rolling device further includes a guiding roller 8, the guiding roller 8 is located between the rolling assembly 7 and the tension roller 1, and the guiding roller 8 is used for guiding the pole piece 100 from the tension roller 1 on the feeding side to the rolling assembly 7 or guiding the pole piece 100 to be discharged from the rolling assembly 7 to the tension roller 1 on the discharging side. In this embodiment, two guide rollers 8 are provided, and the two guide rollers 8 are respectively located at both sides of the rolling assembly 7, and are both located between the tension roller 1 and the rolling assembly 7.

In the present embodiment, the tension roller 1, the guide roller 8, the pressing roller 71, and the back roller 72 are rotatable along their central axes.

In another embodiment, the pole piece 100 rolling device further includes a winding component and an unwinding component, the unwinding component is located on the feeding side, the winding component is located on the discharging side, the unwinding component can release the pole piece 100 that is not rolled, and the winding component is used for winding the pole piece 100 after rolling. Specifically, the pole piece 100 enters the tension roller 1 from the unreeling component, the tension roller 1 stretches the empty foil region 120 of the pole piece 100, then the pole piece 100 is guided to enter the rolling component 7 through the guide roller 8, the compression roller 71 and the back roller 72 of the rolling component 7 roll the coating region 110 of the pole piece 100 to increase the energy density of the pole piece 100, after the pole piece 100 is rolled, the pole piece 100 is guided to enter the tension roller 1 at the discharging side through the guide roller 8, meanwhile, the tension roller 1 stretches the empty foil region 120 of the pole piece 100, and finally the pole piece 100 is rolled by the reeling component.

In the description herein, it should be understood that the terms "upper," "lower," and the like are used for convenience in description and simplicity of operation only, and are not necessarily indicative or implying any particular orientation, configuration or operation of such apparatus or elements herein, and therefore should not be construed as limiting the present utility model.

In the description of the present specification, reference to the term "an embodiment" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims

1. A stretch roller assembly for stretching a pole piece, comprising:

the driving piece is connected with the tension roller;

2. The tension roller assembly of claim 1, wherein the tension roller comprises a detachably disposed roller body and a roller sleeve, the roller body is connected to the driving member, the roller sleeve is disposed on the outer periphery of the roller body, and the protruding portion is provided on the roller sleeve in a protruding manner.

3. The stretch roller assembly of claim 2, wherein the roller body is bonded to the roller housing; or alternatively, the first and second heat exchangers may be,

the roller body is connected with the roller sleeve through a threaded piece.

4. A stretch roller assembly according to any one of claims 1 to 3 wherein the bosses are circumferentially disposed about the tension roller.

5. A stretch roller assembly according to any one of claims 1 to 3, wherein a transition cambered surface is provided at the junction of the raised portion and the recessed region; and/or the number of the groups of groups,

6. A stretch roller assembly according to any one of claims 1 to 3 further comprising a bracket and bearing members, wherein both ends of the tension roller are rotatably connected to the bracket via the bearing members, and wherein the driving member is connected to the bracket and drives the bracket to move to drive the tension roller to move.

7. A stretch roller assembly according to any one of claims 1 to 3, wherein the projection height of the projection is 0.2mm to 1mm.

8. A pole piece rolling device comprising a rolling assembly, wherein the rolling assembly comprises a compression roller and a back roller which are oppositely arranged and used for rolling the pole piece, and the pole piece rolling device is characterized by further comprising a stretching roller assembly according to any one of claims 1-7, and a tension roller of the stretching roller assembly is positioned on one circumferential side of the compression roller.

9. The pole piece roll-in device of claim 8, wherein the tension roller assemblies are provided in two sets, the two sets of tension roller assemblies being located on either side of the roll-in assembly.

10. The pole piece roll-in device of claim 8, further comprising a guide roller positioned between the roll-in assembly and the tension roller.