CN219616916U - Pole piece die cutting device and pole piece - Google Patents

Abstract

The disclosure provides a pole piece die cutting device and pole piece, relates to the technical field of battery manufacturing. The pole piece die cutting device comprises a cutter mechanism and a laser mechanism, wherein the cutter mechanism is used for cutting a pole piece material belt to form a first cutting edge, and the first cutting edge is used as a first contour for connecting two adjacent pole lugs. The laser mechanism is used for cutting the pole piece material belt to form a second cutting edge, and the second cutting edge is used as a second contour of the pole lug. Wherein the first profile and the second profile are alternately connected in turn. Thus, the processing quality and the production efficiency of the pole piece are improved.

Description

Pole piece die cutting device and pole piece

Technical Field

The utility model relates to the technical field of battery manufacturing, in particular to a pole piece die cutting device and a pole piece.

Background

In the prior art, the method for die cutting the polar plate material belt comprises laser cutting or hardware die cutting, and if hardware die cutting is adopted, the cutting speed is too slow, so that the improvement of the production efficiency is not facilitated. If laser cutting is adopted, although the production efficiency is improved to a certain extent, the cutting temperature of the laser cutting machine can cause thermal influence on the pole piece, so that the quality of the pole piece is reduced, and the product performance is influenced.

Disclosure of Invention

The utility model aims to provide a pole piece die cutting device and a pole piece, which can improve die cutting efficiency and are beneficial to alleviating thermal influence caused by laser cutting.

Embodiments of the utility model may be implemented as follows:

in a first aspect, the present utility model provides a pole piece die cutting device for forming a pole piece and a pole tab on a pole piece material strip, comprising:

the cutter mechanism is used for cutting the pole piece material belt to form a first cutting edge which is used as a first contour for connecting two adjacent pole lugs;

the laser mechanism is used for cutting the pole piece material belt to form a second cutting edge which is used as a second contour of the pole lug;

wherein the first profile and the second profile are alternately connected in sequence.

In an alternative embodiment, the cutter mechanism comprises a first cutter provided with a cutting part and a notch part which are connected along the circumferential direction, wherein the cutting part is used for cutting the pole piece material belt to form a first cutting edge, and the notch part is used for forming a spacing section between two adjacent first contours.

In an alternative embodiment, the arc length of the cutting portion is equal to the length of the first profile.

In an alternative embodiment, the cutting portion is provided with a chamfer.

In an optional embodiment, the cutter mechanism further comprises a second cutter which is arranged opposite to the first cutter, and the first cutter and the second cutter are respectively arranged at two sides of the pole piece material belt so as to clamp the pole piece material belt; the cutting part on the first cutter is opposite to the second cutter to cut the pole piece material belt to form a first cutting edge, and the notch part and the second cutter are opposite to each other to form a spacing section between two adjacent first contours.

In an alternative embodiment, the first cutter and the second cutter are disc-shaped, the diameter of the first cutter is C, the diameter of the second cutter is D, the center-to-center distance between the first cutter and the second cutter is E, and the biting amount t=0.5c+0.5d-E when the cutting portion of the first cutter and the second cutter are opposite to each other, T is greater than or equal to 0.

In an alternative embodiment, the second cutter is provided with a continuous cutting portion in a ring shape along the circumferential direction.

In an alternative embodiment, the cutter mechanism further comprises a first roll shaft and a second roll shaft, the first cutter is installed on the first roll shaft, and the first roll shaft is used for driving the first cutter to rotate; the second cutter is arranged on the second roll shaft, and the second roll shaft is used for driving the second cutter to rotate.

In an alternative embodiment, the cutter mechanism further comprises a shaft sleeve, wherein the shaft sleeve is arranged on the first roller shaft and/or the second roller shaft, and the shaft sleeve is used for limiting the axial position of the first cutter and/or the second cutter.

In an alternative embodiment, two first cutters are arranged on the first roll shaft at intervals along the axial direction; the second roll shaft is provided with two second cutters at intervals along the axial direction, and the first cutters and the second cutters are arranged oppositely one by one.

In an alternative embodiment, the laser mechanism is arranged downstream of the cutter mechanism in the tape running direction of the pole piece material tape; alternatively, the laser mechanism is disposed upstream of the cutter mechanism.

In an alternative embodiment, the pole piece die cutting device further comprises at least two auxiliary rollers, wherein one auxiliary roller is arranged at the upstream of the laser mechanism, and the other auxiliary roller is arranged at the downstream of the laser mechanism.

In an alternative embodiment, the laser scans along a predetermined path to form a second cut edge; the preset path comprises a first edge line, a second edge line and a third edge line which are positioned between two adjacent first contours, wherein the two adjacent first contours have a first end and a second end which are adjacent; the first end is located upstream of the second end;

the first side line starts from the second end part and extends a first distance along a direction away from the pole piece;

the second side line starts from one end of the first side line far away from the pole piece and extends for a second distance along the direction opposite to the tape running direction of the pole piece material tape;

the third edge line starts from one end of the second edge line far away from the first edge line and ends at the first end portion.

In a second aspect, the present utility model provides a pole piece processed using a pole piece die cutting device as described in any one of the previous embodiments.

The beneficial effects of the embodiment of the utility model include, for example:

according to the pole piece die cutting device provided by the embodiment of the utility model, the cutter mechanism is adopted to cut the pole piece material strip to form the first contour between the two pole lugs, so that the first contour is prevented from being influenced by heat, the cutting edge is flat, burrs are small and less, the pole piece die cutting quality is improved, and the product quality is improved. And the second contour of the tab is formed by laser cutting, so that the die cutting efficiency is improved. Therefore, the scheme can not only realize the improvement of production efficiency, but also realize the improvement of product quality.

The pole piece provided by the embodiment of the utility model is processed and manufactured by adopting the pole piece die cutting device, thereby being beneficial to improving the production efficiency and the product quality.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a pole piece material belt before and after cutting according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a pole piece die-cutting device according to an embodiment of the present utility model;

FIG. 3 is a schematic structural view of a pole piece die cutting device according to an embodiment of the present utility model for forming a first profile on a pole piece material belt;

fig. 4 is a schematic structural view of a pole piece die cutting device according to an embodiment of the present utility model for forming a second profile on a pole piece material belt;

fig. 5 is a schematic structural view of a first view angle of a first cutter in the pole piece die cutting device according to the embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional view of H-H in FIG. 5;

fig. 7 is a schematic structural view of a first view angle of a first state of a cutter mechanism in a pole piece die cutting device according to an embodiment of the present utility model;

FIG. 8 is a schematic cross-sectional view of the structure K-K of FIG. 7;

fig. 9 is a schematic structural view of a first view angle of a second state of a cutter mechanism in a pole piece die cutting device according to an embodiment of the present utility model;

FIG. 10 is a schematic cross-sectional view of M-M in FIG. 9;

fig. 11 is a schematic structural diagram of a laser mechanism forming a second profile between two adjacent first profiles in the pole piece die cutting device according to the embodiment of the present utility model.

Icon: 1-a pole piece material belt; 11-coating zone; 12-tab area; 121-a first profile; 1211-a first end; 1213-a second end; 123-a second profile; 1231-first edge; 1233-second edge; 1235-third edge; 13-pole pieces; 14-electrode lugs; 2-a pole piece die cutting device; 21-unreeling mechanism; 22-unreeling and caching mechanisms; 23-a deviation correcting mechanism; 24-a cutter mechanism; 241-a first cutter; 2411-a cutting part; 2413-a notch; 2415-chamfering; 242-a second cutter; 243-a first roller; 244-a second roller; 245-shaft sleeve; 25-a laser mechanism; 251-auxiliary roller; 26-a pressing mechanism; 261-pressing roller; 262-driving roller; 27-a rolling buffer mechanism; 28-a winding mechanism; 29-passing the roller.

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. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the 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.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present utility model and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.

It should be noted that the features of the embodiments of the present utility model may be combined with each other without conflict.

In connection with fig. 1, during the processing of pole piece 13, it is generally necessary to cut pole piece strip 1 to form pole piece 13 and tab 14 protruding from pole piece 13. Wherein, pole piece material area 1 comes the material with coiled material form, and the length direction of pole piece material area 1 is the direction of tape running of pole piece material area 1. The pole piece material belt 1 is provided with a coating area 11 and a pole lug area 12, if a pole lug 14 is arranged on one side of a pole piece 13 product, the pole lug area 12 is one, and the pole lug area 12 is positioned on one side of the pole piece material belt 1 in the width direction. If the pole piece 13 is provided with two pole lugs 14 on two sides, two pole lug areas 12 are provided, and the two pole lug areas 12 are respectively positioned on two sides of the pole piece material belt 1 in the width direction. The pole piece 13 die cutting process mainly cuts the tab area 12, and cuts the continuous tab area 12 into a plurality of tabs 14 spaced in the length direction, namely, the cut tab area 12 retains the tabs 14 and straight-edge spacing segments between adjacent tabs 14. The upper part in fig. 1 is a schematic structural view of the pole piece material belt 1 before die cutting, and the lower part in fig. 1 is a schematic structural view of the pole piece 13 and the pole lug 14 formed after die cutting.

Referring to fig. 2 to 4, the present embodiment provides a pole piece die cutting device 2 including a cutter mechanism 24 and a laser mechanism 25, wherein the cutter mechanism 24 is used for cutting a pole piece material strip 1 to form a first cutting edge, and the first cutting edge is used as a first contour 121 connecting two adjacent pole lugs 14. The laser mechanism 25 is used to cut the pole piece web 1 to form a second cut edge that serves as the second profile 123 of the tab 14. Wherein the first profile 121 and the second profile 123 are alternately connected in sequence. Like this, adopt cutter mechanism 24 to cut pole piece material area 1 and form the first profile 121 between two utmost point ears 14, avoided first profile 121 department to receive the heat influence, and the cutting edge is level and smooth, and the burr is less, is favorable to improving pole piece 13 cross cutting quality, promotes the product quality. And, the second profile 123 of the tab 14 is formed by laser cutting, which improves die cutting efficiency. Therefore, the scheme can not only realize the improvement of production efficiency, but also realize the improvement of product quality.

It will be appreciated that the width of the coating region 11 is the width W of the pole piece 13. The cutting position of the cutter mechanism 24 is the junction of the tab area 12 and the coating area 11, and the cutting is intermittent in the tape-feeding direction, i.e. a plurality of first cutting edges are arranged at intervals. The cutting position of the laser mechanism 25 is the tab area 12, and the cutting is scanned along a preset path to form the second contour 123 of the tab 14.

Referring to fig. 5 to 6, the cutter mechanism 24 includes a first cutter 241, where the first cutter 241 is provided with a cutting portion 2411 and a notch portion 2413 connected in a circumferential direction, the cutting portion 2411 is used for cutting the pole piece material strip 1 to form a first cutting edge, and the notch portion 2413 is used for forming a spacer between two adjacent first profiles 121. Wherein the arc length of the cutting portion 2411 is equal to the length of the first profile 121. The arc length of the notch portion 2413 is equal to the length of the single tab 14 in the tape running direction of the pole piece tape 1, so that one rotation of the first cutter 241 cuts out a first profile 121 and leaves a space.

Optionally, the cutting portion 2411 is provided with a chamfer 2415. Like this, the cutting edge of cutting part 2411 is sharper, is favorable to the cutting edge to be more even, reduces the burr, improves cutting quality and efficiency.

It should be noted that the first cutter 241 may be annular, and include a plurality of cutting portions 2411 and notch portions 2413 alternately arranged in sequence in the circumferential direction, where an arc length of each cutting portion 2411 is equal to a length of the first profile 121, and an arc length of each notch portion 2413 is equal to a length of the tab 14. Like this, first cutter 241 rotates a round, can cut out a plurality of spaced first profile 121, and cutting efficiency is higher, and then is favorable to improving production efficiency. For example, the number of the cut portions 2411 and the notched portions 2413 may be two, three, four, five or more, respectively, which is not particularly limited herein. The first cutter 241 may be linear, and the length of the cutting portion 2411 of the first cutter 241 may be equal to the length of the first contour 121, and one first contour 121 may be cut by one cutting operation. Alternatively, the first cutter 241 may be linear, where the first cutters 241 are sequentially and alternately provided with the cutting portions 2411 and the notch portions 2413 in the length direction, the length of the cutting portion 2411 is equal to that of the first profile 121, and the length of the notch portion 2413 is equal to that of the tab 14, so that a plurality of first profiles 121 with intervals can be cut by one cutting operation, which is more efficient in cutting, and is further beneficial to improving the production efficiency.

Referring to fig. 7 to 10, optionally, the cutter mechanism 24 further includes a second cutter 242 disposed opposite to the first cutter 241, where the first cutter 241 and the second cutter 242 are disposed on two sides of the pole piece material belt 1 to clamp the pole piece material belt 1; wherein, the cutting portion 2411 on the first cutter 241 is opposite to the second cutter 242 to cut the pole piece material strip 1 to form a first cutting edge, and the notch portion 2413 is opposite to the second cutter 242 to not cut the pole piece material strip 1 to form a spacing section between two adjacent first profiles 121. The second cutter 242 may be annular, and the second cutter 242 is provided with a continuous cutting portion 2411 in an annular shape along the circumferential direction. In this way, when the first cutter 241 and the second cutter 242 are respectively formed by circular cutters, and the cutting portion 2411 of the first cutter 241 is engaged with the second cutter 242, as shown in fig. 7 and 8, the boundary between the coating region 11 and the tab region 12 is cut by the shearing force between the first cutter 241 and the second cutter 242, forming the first cutting edge, i.e., the first profile 121. When the cutting portion 2411 of the first cutter 241 is not engaged with the second cutter 242, i.e., the notch portion 2413 of the first cutter 241 is opposite to the second cutter 242, as shown in fig. 9 and 10, the first cutter 241 is not in contact with the pole piece material tape 1, the tab region 12 of the pole piece material tape 1 is not cut, and the tab 14 portion remains.

Optionally, the first cutter 241 and the second cutter 242 are disc-shaped, the diameter of the first cutter 241 is C, the diameter of the second cutter 242 is D, the center distance between the first cutter 241 and the second cutter 242 is E, the length of the first contour 121 is a, the length of the tab 14 in the feeding direction of the pole piece material tape 1 is B, the distance between the two tabs 14 is L, and l=a+b. The biting amount t=0.5c+0.5d-E when the cutting portion 2411 of the first cutter 241 and the second cutter 242 are opposed to each other, T is 0 or more. In this embodiment, the occlusion amount of the first cutter 241 and the second cutter 242 is greater than or equal to 0, so that the cutting of the pole piece material belt 1 can be realized. In the present embodiment, the design value c=d=e is adopted, and the engagement amount t=0.5c+0.5d-e=0 of the first cutter 241 and the second cutter 242. In addition, to ensure the stability of the system, the linear speed of the first cutter 241, the linear speed of the second cutter 242, and the feeding speed of the pole piece material belt 1 are all set to be uniform, and the linear speeds of the three are equal, so if the length of each rotation of the first cutter 241 passing through is the circumference pi C, the pole piece material belt 1 advances by a complete tab 14 distance L, pi c=l. Since the cutting portion 2411 of the first cutter 241 cuts only the first profile 121 (the portion with the length a), the tab 14 portion (the portion with the length B) is not cut, the arc length of the notch portion 2413 is equal to the length B of the tab 14 portion, and the arc length of the cutting edge of the cutting portion 2411 is equal to the length a of the first profile 121, i.e., the straight edge area length a of the pole piece 13.

Optionally, the cutter mechanism 24 further includes a first roller 243 and a second roller 244, the first cutter 241 is mounted on the first roller 243, and the first roller 243 is used for driving the first cutter 241 to rotate; the second cutter 242 is mounted on a second roller 244, and the second roller 244 is used for driving the second cutter 242 to rotate. By adopting the roll cutting method, the cutting speed can be increased, the cut is flat, and the intermittent first profile 121 can be conveniently cut by arranging the cutting part 2411 and the notch part 2413 on the first cutter 241, so that the tab 14 part is reserved.

Optionally, the cutter mechanism 24 further includes a sleeve 245, where the sleeve 245 is disposed on the first roller 243 and/or the second roller 244, and the sleeve 245 is configured to limit the axial position of the first cutter 241 and/or the second cutter 242. It can be appreciated that the sleeve 245 is sleeved on the first roller 243 to limit the axial position of the first cutter 241, so as to improve the cutting accuracy and quality. The sleeve 245 is sleeved on the second roller shaft 244 to limit the axial position of the second cutter 242. The first roller shaft 243 and the second roller shaft 244 may be provided with the shaft sleeve 245, or only one of them may be provided with the shaft sleeve 245. After the embodiment, the shaft sleeve 245 is arranged on the second roller shaft 244, and the shaft sleeve 245 is abutted against the second cutter 242, so that the cutting precision and the cutting quality can be improved.

It will be appreciated that the first cutter 241 is disposed above the pole piece web 1 and the second cutter 242 is disposed below the pole piece web 1. In other embodiments, the position of the first cutter 241 and the position of the second cutter 242 may be interchanged, and are not particularly limited herein. If the tab 14 is provided on one side of the pole piece 13, only one side of the pole piece material tape 1 may be die-cut, so that the number of the first cutters 241 and the second cutters 242 is one. If the pole piece 13 is provided with the pole lugs 14 at two sides, a first cutter 241 and a second cutter 242 are respectively arranged at two sides of the pole piece material belt 1. Fig. 8 shows a structure in which the pole piece material strips 1 are cut at both sides. Specifically, two first cutters 241 are disposed on the first roller 243 at intervals along the axial direction; two second cutters 242 are axially arranged on the second roll shaft 244 at intervals, and the first cutters 241 are arranged opposite to the second cutters 242 one by one.

In some embodiments, the second cutter 242 may not be provided with a cutting edge, the second cutter 242 plays a role in supporting the pole piece material belt 1, and the cutting of the pole piece material belt 1 is achieved through the pressing force of the first cutter 241. In this case, the second cutter 242 may be a disk, a cylinder, or any other shape, or may be just a supporting table for cutting, which is not particularly limited herein.

Alternatively, the laser mechanism 25 is arranged downstream of the cutter mechanism 24 in the tape running direction of the pole piece material tape 1; alternatively, the laser mechanism 25 is disposed upstream of the cutter mechanism 24. The pole piece material strip 1 is preferably cut by a cutter, and then the pole piece material strip 1 is cut by laser to form a pole piece 13 and a pole lug 14.

Alternatively, the laser mechanism 25 employs a laser. The pole piece die cutting device 2 further comprises at least two auxiliary rollers 251, wherein one auxiliary roller 251 is arranged upstream of the laser mechanism 25, and the other auxiliary roller 251 is arranged downstream of the laser mechanism 25. In this embodiment, two auxiliary rollers 251 are disposed next to the laser mechanism 25, and the two auxiliary rollers 251 support and tighten the pole piece material belt 1, so that the laser mechanism 25 cuts the pole piece material belt 1, and the arrangement is beneficial to making the cutting edge smoother, reducing burrs and improving cutting quality. Optionally, one of the auxiliary rollers 251 is located between the laser mechanism 25 and the cutter mechanism 24 to tighten the pole piece material strip 1, improving the cutting quality.

It will be appreciated that if the tab 14 is provided on one side of the pole piece 13, only one laser need be arranged. If the pole piece 13 is provided with the pole lugs 14 at two sides, two lasers can be arranged, and the two lasers are respectively arranged at two sides of the pole piece material belt 1. The scan path of the laser is shown in fig. 4.

The pole piece die cutting device 2 of the present embodiment is provided with an unreeling mechanism 21, an unreeling buffer mechanism 22, a deviation rectifying mechanism 23, a cutter mechanism 24, a laser mechanism 25, a pressing mechanism 26, a reeling buffer mechanism 27 and a reeling mechanism 28 in sequence along the tape running direction of the pole piece material tape 1. After the pole piece material belt 1 is unreeled, the pole piece material belt is corrected by the correction mechanism 23, and then a first cutting edge, namely a first contour 121 with the length of A, is cut by the cutter mechanism 24. Then the tab 14 with the length B is scanned and cut by the laser mechanism 25, and finally the tab is rolled. In this embodiment, the pressing mechanism 26 includes a pressing roller 261 and a driving roller 262 disposed opposite to each other, and the pressing mechanism 26 is used to clamp the pole piece 13 and then forward. The unreeling caching mechanism 22 is used for caching the pole piece material belt 1 when the unreeling speed is inconsistent with the main driving speed, so that the pole piece material belt 1 is always in a tight state and is not too loose (the unreeling speed is faster than the main driving speed) and too tight (the main driving speed is faster than the unreeling speed); the winding buffer mechanism 27 is used for buffering the pole piece 13 when the unreeling speed is inconsistent with the main driving speed, so that the pole piece 13 is always in a tight state and is not too loose (the main driving speed is faster than the winding speed) and too tight (the winding speed is faster than the main driving speed). It should be understood that, according to the trend requirement of the actual pole piece material belt 1, a plurality of passing rollers 29 are further arranged, and the passing rollers 29 play a role in supporting and guiding the pole piece material belt 1 or the pole piece 13. The setting positions of the laser mechanism 25 and the cutter mechanism 24 can be flexibly adjusted according to actual needs.

The embodiment of the utility model provides a pole piece die cutting device 2, which comprises the following cutting method:

forming a first cutting edge on the pole piece material belt 1 by adopting a cutter mechanism 24, wherein the first cutting edge is used as a first contour 121 for connecting two adjacent pole lugs 14; forming a second cutting edge on the pole piece material belt 1 by adopting a laser mechanism 25, wherein the second cutting edge is used as a second contour 123 of the pole lug 14; wherein the first profile 121 and the second profile 123 are alternately connected in sequence.

Optionally, a first cutting edge is formed first, and then a second cutting edge is formed; or forming a second cutting edge and then forming a first cutting edge; alternatively, the first cut edge and the second cut edge are formed simultaneously. In this embodiment, the first cutting edge is formed first.

Optionally, the method of forming the second cut edge is as follows:

referring to fig. 4 and 11, the laser scans along a preset path to form a second cutting edge; wherein the preset path comprises a continuous first edge 1231, second edge 1233 and third edge 1235 between two adjacent first profiles 121, wherein the two adjacent first profiles 121 have adjacent first and second ends 1211, 1213; the first end 1211 is located upstream of the second end 1213. The first edge 1231 begins at the second end 1213 and extends a first distance in a direction away from the pole piece 13. The second edge 1233 starts at the end of the first edge 1231 remote from the pole piece 13 and extends a second distance in a direction opposite to the direction of travel of the pole piece strip 1. The third edge 1235 begins at an end of the second edge 1233 remote from the first edge 1231 and ends at the first end 1211. The preset path, i.e., the second profile 123 of the tab 14, wherein the first and second distances are determined according to the shape and size of the designed tab 14, is not specifically limited herein.

Optionally, the first edge 1231 is connected to the end of the first contour 121 by an arc transition, and the third edge 1235 is connected to the end of the first contour 121 by an arc transition, so that stress concentration and burrs are reduced.

The embodiment of the utility model also provides a pole piece 13 which is processed by the pole piece die cutting device 2 according to any one of the previous embodiments, and the pole piece 13 is provided with a pole lug 14. The pole piece 13 that the device obtained cuts the burr little, and the burr is few, can alleviate the heat influence to the first profile 121 department of pole piece 13 in the laser cutting, and cutting quality is good, and cutting accuracy is high, promotes cutting efficiency by a wide margin, and then is favorable to improving the production efficiency of pole piece 13.

In summary, the pole piece die cutting device 2 and the pole piece 13 provided by the embodiment of the utility model have the following beneficial effects that:

according to the pole piece die cutting device 2 provided by the embodiment of the utility model, the cutter mechanism 24 is adopted to cut the pole piece material belt 1 to form the first contour 121 between the two pole lugs 14, so that the first contour 121 is prevented from being affected by heat, the cutting edge is flat, burrs are small and less, the die cutting quality of the pole piece 13 is improved, and the product quality is improved. And, the second profile 123 of the tab 14 is formed by laser cutting, which improves die cutting efficiency. Therefore, the production efficiency can be improved, and the product quality of the pole piece 13 can be improved.

The pole piece 13 provided by the embodiment of the utility model is processed by the pole piece die cutting device 2, and the pole piece 13 is provided with the pole lugs 14, so that the production efficiency and the product quality are improved.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a pole piece cross cutting device for form pole piece and utmost point ear on pole piece material area, its characterized in that includes:

the cutter mechanism is used for cutting the pole piece material belt to form a first cutting edge which is used as a first contour for connecting two adjacent pole lugs;

the laser mechanism is used for cutting the pole piece material belt to form a second cutting edge which is used as a second contour of the pole lug;

wherein the first profile and the second profile are alternately connected in sequence.

2. The pole piece die cutting device of claim 1, wherein the cutter mechanism comprises a first cutter provided with a cutting portion and a notch portion connected in a circumferential direction, the cutting portion being used for cutting a pole piece material strip to form a first cutting edge, the notch portion being used for forming a spacing section between two adjacent first profiles.

3. The pole piece die cutting device of claim 2, wherein the arc length of the cutting portion is equal to the length of the first profile.

4. The pole piece die cutting device of claim 2, wherein the cutter mechanism further comprises a second cutter arranged opposite to the first cutter, the first cutter and the second cutter being respectively arranged at two sides of a pole piece material belt to clamp the pole piece material belt; the cutting part on the first cutter is opposite to the second cutter to cut the pole piece material belt to form a first cutting edge, and the notch part and the second cutter are opposite to each other to form a spacing section between two adjacent first contours.

5. The die cutting device for pole pieces according to claim 4, wherein the first cutter and the second cutter are disc-shaped, the diameter of the first cutter is C, the diameter of the second cutter is D, the center-of-circle distance between the first cutter and the second cutter is E, and the biting amount t=0.5c+0.5d-E when the cutting portion of the first cutter and the second cutter are opposed to each other is T greater than or equal to 0.

6. The pole piece die cutting device of claim 4, wherein the second cutter is circumferentially provided with a continuous cutting portion in the shape of a ring.

7. The pole piece die cutting device of claim 4, wherein the cutter mechanism further comprises a first roller and a second roller, the first cutter is mounted on the first roller, and the first roller is used for driving the first cutter to rotate; the second cutter is arranged on the second roll shaft, and the second roll shaft is used for driving the second cutter to rotate.

8. The pole piece die cutting device of claim 7, wherein the cutter mechanism further comprises a sleeve disposed about the first and/or second roller shafts, the sleeve being configured to limit the axial position of the first and/or second cutters.

9. The pole piece die cutting device of any one of claims 1 to 8, further comprising at least two auxiliary rollers, one of the auxiliary rollers being located upstream of the laser mechanism and the other auxiliary roller being located downstream of the laser mechanism.

10. A pole piece, characterized in that the pole piece is processed by the pole piece die cutting device according to any one of claims 1 to 9, and a pole lug is connected to the pole piece.