Lithium battery pole piece embossing device

Abstract

The utility model discloses a lithium battery pole piece embossing device which comprises an embossing roller capable of rolling relative to the surface of a lithium battery pole piece. The embossing roller further comprises a plurality of embossing protrusions, and the embossing protrusions are located on the outer circumferential side of the embossing roller. The two ends of each embossing protrusion extend to the two ends of the embossing roller, the adjacent embossing protrusions are obliquely arranged, and the ends, close to each other, of the adjacent embossing protrusions intersect to form an intersection point, so that the adjacent embossing protrusions form a V shape. The intersection point is located at the end of the embossing roller, and the directions of the adjacent V-shaped openings formed by the embossing protrusions are opposite. According to the scheme, when the embossing roller rolls on the lithium battery pole piece, the embossing protrusions can form indentations on the lithium battery pole piece, and the embossing formed by every two adjacent embossing protrusions is in a V shape. Each V-shaped indentation is provided with two inclined side edges, and each side edge can have two components along the length direction and the width direction of the lithium battery pole piece, so that the wrinkle resistance of the lithium battery is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery manufacturing equipment technical field more specifically, relate to a kind of lithium battery pole piece embossing device. BACKGROUND

[0002] With the development of new energy industry, the proportion of lithium battery market is also growing, especially in electric vehicles and energy storage industry. The common lithium-ion battery manufacturing process is divided into laminating process and winding process. The winding process is relatively mature, and the equipment cost is low and the degree of automation is high. Most battery manufacturing enterprises use winding process. However, the battery produced by winding process rebounds and expands after liquid injection and charge-discharge, causing the internal pole piece of the battery cell to wrinkle and deform, which affects the electrical performance and safety performance of the battery, and seriously reduces the service life of the battery.

[0003] In order to improve the internal pole piece wrinkle deformation, the pole piece is usually embossed. For example, the publication number CN221213242U discloses a lithium battery pole piece embossing device, which includes an embossing roller and a cooperating roller. The outer periphery of the embossing roller is covered with a flexible first rubber pad, and the outer periphery of the first rubber pad is evenly distributed with a plurality of embossing protrusions. The outer periphery of the cooperating roller is evenly distributed with a plurality of recesses. The recesses are provided with a plurality of cooperating protrusions at the intervals. The embossing roller and the cooperating roller form a pair of rollers, the embossing protrusions correspond to the positions of the recesses, and can cooperate with the recesses to form a first embossing on the side of the pole piece in contact with the cooperating roller. The cooperating protrusions can make the first rubber pad compress and deform to form a second embossing on the other side of the pole piece in contact with the embossing roller. In this scheme, the embossing can increase the rebound space of the pole piece, reduce the stress between the positive and negative pole pieces, and improve the internal stress of the winding core and the wrinkle problem of the internal pole piece of the battery cell. However, in this scheme, the embossing formed on the pole piece is a circular dot distribution, which has poor anti-wrinkle ability in practice. SUMMARY

[0004] The utility model provides a kind of lithium battery pole piece embossing device, further improve the anti-wrinkle ability of lithium battery pole piece after embossing.

[0005] To achieve the above purpose, the technical scheme provided by the utility model is as follows:

[0006] A kind of lithium battery pole piece embossing device, comprising,

[0007] The embossing roller can roll relative to the surface of the lithium battery pole piece;

[0008] Further comprising,

[0009] A plurality of embossing protrusions are arranged on the outer circumferential side of the embossing roller; the two ends of the embossing protrusions extend to the two ends of the embossing roller, the adjacent embossing protrusions are arranged in an inclined manner, and the ends of the adjacent embossing protrusions close to each other intersect and form intersection points, so that the adjacent embossing protrusions form a "V" shape; and the intersection points are located at the end of the embossing roller, and the adjacent "V" shapes formed by the embossing protrusions have opposite opening directions.

[0010] In the rolling of the embossing roller on the lithium battery pole piece, the embossing protrusions form indentations on the lithium battery pole piece, and the embossing formed by every two adjacent embossing protrusions is in a V shape. Each V-shaped indentation has two inclined sides, and each side can have two components in the length direction and width direction of the lithium battery pole piece, thereby improving the wrinkle resistance of the lithium battery.

[0011] As a further improvement, the embossing protrusions are in a straight line shape.

[0012] As a further improvement, the angle between adjacent embossing protrusions is α, and the size of the angle α is 15°-45°.

[0013] As a further improvement, the side of the embossing protrusion away from the embossing roller is in a circular arc shape, so that the embossing protrusion has an arc-shaped transition in the V-shaped indentation formed on the battery pole piece, avoiding stress concentration on the pole piece and causing the pole piece to break.

[0014] As a further improvement, the side of the embossing protrusion away from the embossing roller is in a circular arc shape, so that the embossing protrusion has an arc-shaped transition in the V-shaped indentation formed on the battery pole piece, avoiding stress concentration on the pole piece and causing the pole piece to break.

[0015] As a further improvement, the side of the embossing protrusion away from the embossing roller is connected to a second protrusion, and the second protrusion is arranged to form a stepped indentation on the pole piece, thereby further improving the wrinkle resistance of the pole piece.

[0016] As a further improvement, the side of the embossing protrusion away from the embossing roller is connected to a second protrusion, and the second protrusion is arranged to form a stepped indentation on the pole piece, thereby further improving the wrinkle resistance of the pole piece.

[0017] As a further improvement, the outer circumferential side of the embossing roller is detachably covered with a coating layer, and the embossing protrusions are arranged on the coating layer. When the embossing roller is used for a long time, the embossing protrusions are damaged or worn out. In order to facilitate the replacement of the embossing protrusions, the coating layer can be replaced, without the need to replace the entire embossing roller, thereby saving the maintenance cost of the equipment.

[0018] As a further improvement, the coating layer is fixedly connected to the roller body of the embossing roller by fasteners, which can facilitate the disassembly of the coating layer.

[0019] As a further improvement, a matching roller is further included, and the matching roller forms a pair of rollers with the embossing roller; and grooves are arranged on the matching roller at positions corresponding to the embossing protrusions.

[0020] The other technical problems, other technical features contained in the technical solutions and advantages brought by the technical features of the embossing device for lithium battery pole piece can be solved, and will be further described in detail in combination with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structure schematic diagram of an embossing roller;

[0022] Figure 2 is a structure schematic diagram of an embossing roller in another embodiment;

[0023] Figure 3 is a cross-sectional schematic diagram of an embossing protrusion;

[0024] Figure 4 is a cross-sectional schematic diagram of an embossing protrusion in another embodiment.

[0025] REFERENCE NUMERALS:

[0026] 1, embossing roller; 102, coating layer; 2, embossing protrusion; 21, second protrusion; 3, fastener; 4, rotating shaft. DETAILED DESCRIPTION

[0027] In order to further understand the content of the utility model, the utility model is described in detail in combination with the drawings and the embodiments.

[0028] The structure, proportion, size and the like shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, for understanding and reading by those skilled in the art, and are not used to limit the limiting conditions of the implementation of the utility model, so they do not have the technical essence, any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose of the utility model, should still fall within the scope of the technical content disclosed by the utility model.

[0029] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like cited in the present specification are only for the convenience of clear description, and are not used to limit the implementation range, the change or adjustment of the relative relationship, without substantially changing the technical content, is also regarded as the implementation scope of the present application. Moreover, in addition to being used to indicate the orientation or position relationship, the above-mentioned part of the terms may also be used to indicate other meanings, for example, the term "upper" may also be used to indicate a certain dependent relationship or connection relationship in some cases. For ordinary skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific situation.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0031] Combination Figure 1 As shown, this embodiment provides a lithium battery electrode embossing device, including an embossing roller 1. During use, the embossing roller 1 can roll relative to the surface of the lithium battery electrode, and after rolling, it can form the required embossing on the surface of the lithium battery electrode.

[0032] The lithium battery electrode embossing device further includes multiple embossing protrusions 2, which are located on the outer circumference of the embossing roller 1. The two ends of the embossing protrusions 2 extend to the two ends of the embossing roller 1. Adjacent embossing protrusions 2 are inclined together, and the ends of adjacent embossing protrusions 2 that are close to each other intersect to form an intersection point, so that adjacent embossing protrusions 2 form a "V" shape. The intersection point is located at the end of the embossing roller 1, and the openings of adjacent "V" shapes formed by the embossing protrusions 2 are opposite in direction.

[0033] In this design, the embossing roller 1 rolls on the lithium battery electrode, and the embossing protrusions 2 form indentations on the electrode. Each pair of adjacent embossing protrusions 2 forms a V-shape. Each V-shaped indentation has two inclined sides, and each side can have two components along the length and width directions of the lithium battery electrode, thereby improving the anti-wrinkle ability of the lithium battery. Furthermore, on the electrode, each pair of adjacent V-shaped indentations is adjacent at the intersection point, resulting in good indentation integrity.

[0034] Furthermore, the embossed protrusions 2 are straight, which makes the resulting indentation have a regular straight shape, so that each side of the V-shape can produce a straight component along the length and width directions of the lithium battery electrode.

[0035] Regarding the angle between two adjacent embossing protrusions 2, for ease of description, the angle between adjacent embossing protrusions 2 is α. In this embodiment, α is 20°, and the two adjacent embossing protrusions 2 are symmetrically arranged relative to the axial direction of the embossing roller 1. In other cases, the value of α can also be set to other values, but it should be within the range of 15° to 45°.

[0036] like Figure 3 As shown, in a preferred embodiment, the side of the embossing protrusion 2 away from the embossing roller 1 is arc-shaped. In other cases, the side of the embossing protrusion 2 away from the embossing roller 1 has an arc-shaped connection with its two end sides. This allows for an arc-shaped transition within the V-shaped indentation formed by the embossing protrusion 2 on the battery electrode, preventing stress concentration on the electrode and thus avoiding electrode breakage. Furthermore, the arc-shaped sides of the embossing protrusion 2 also prevent scratching the electrode during rolling.

[0037] As shown in Figure 4 embodiment, the embossing protrusion 2 is also provided with a second protrusion 21 protruding away from the side of the embossing roller 1. The side edges of the second protrusion 21 are connected by a circular arc. The circular arc is provided to form a transition with arc shape in the V-shaped embossed mark on the battery electrode sheet, to avoid stress concentration on the electrode sheet and cause the electrode sheet to break. The second protrusion 21 is provided to form a stepped embossed mark on the electrode sheet, which can further improve the anti-wrinkling ability of the electrode sheet.

[0038] In another case, the embossing protrusion 2 is also provided with a second groove recessed away from the side of the embossing roller 1. The side edges of the second groove are also connected by a circular arc. In this case, the V-shaped embossed mark formed on the electrode sheet can provide a rebound space on both sides of the electrode sheet, thereby improving the service life of the battery.

[0039] As shown in Figure 2 The outer circumferential side of the embossing roller 1 is provided with a detachable coating layer 102, and the embossing protrusion 2 is arranged on the coating layer 102. When the embossing roller 1 and the embossing protrusion 2 are damaged or worn after a long time, the coating layer 102 can be replaced without replacing the entire embossing roller 1, thereby saving the maintenance cost of the equipment.

[0040] The coating layer 102 is fixedly connected to the roller body of the embossing roller 1 by a fastener 3. Preferably, the fastener 3 can be a rivet or a counterbore bolt hole. In some cases, the coating layer 102 can also be adhered to the roller body of the embossing roller 1.

[0041] The lithium battery electrode sheet embossing device further comprises a matching roller which forms a pair of rollers with the embossing roller 1. The matching roller is provided with a groove at a position corresponding to the embossing protrusion 2. During use of the embossing device, the lithium battery electrode sheet passes between the matching roller and the embossing roller 1, and the embossing protrusion 2 is arranged corresponding to the groove, thereby forming an embossed mark on the electrode sheet.

[0042] The terms "mount", "arrange", "provide with", and "connect" should be understood in a broad sense. For example, it can be fixedly connected, detachably connected, or integrally configured; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0043] The above describes the utility model and its embodiments in a schematic manner, and the description is not restrictive, and the drawings only show one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if a person of ordinary skill in the art is inspired thereby, without departing from the creative concept of the utility model, similar structural modes and embodiments are designed without creativity, and all should belong to the protection scope of the utility model.

Claims

1. A lithium battery pole piece embossing device, comprising, an embossing roller (1) capable of rolling relative to the surface of a lithium battery pole piece; characterized in that further comprising, a plurality of embossing protrusions (2) located on the outer circumferential side of the embossing roller (1); both ends of the embossing protrusions (2) extend to both ends of the embossing roller (1), adjacent embossing protrusions (2) are arranged obliquely, and the ends of adjacent embossing protrusions (2) intersect and form intersection points, so that adjacent embossing protrusions (2) form "V" shapes; and the intersection points are located at the end of the embossing roller (1), and the opening directions of adjacent "V" shapes formed by the embossing protrusions (2) are opposite.

2. The lithium battery pole piece embosser device of claim 1, wherein: The embossing protrusions (2) are linear.

3. The lithium battery pole piece embosser of claim 2, wherein: The angle between adjacent embossing protrusions (2) is α, and the size of the angle α is 15°-45°.

4. The lithium battery pole piece embosser of claim 3, wherein: The side of the embossing protrusion (2) away from the embossing roller (1) is in the shape of a circular arc.

5. The lithium battery pole piece embosser of claim 3, wherein: The side of the embossing protrusion (2) away from the embossing roller (1) is in the shape of a circular arc.

6. The lithium battery pole piece embosser apparatus of claim 5, wherein: The side of the embossing protrusion (2) away from the embossing roller (1) is also connected to a second protrusion (21).

7. The lithium battery pole piece embosser of claim 6, wherein: The side surfaces of the second protrusions (21) are connected in the shape of a circular arc.

8. The lithium battery pole piece embosser of any one of claims 1-7, wherein: The outer circumferential side of the embossing roller (1) is detachably covered with a coating layer (102), and the embossing protrusions (2) are arranged on the coating layer (102).

9. The lithium battery pole piece embosser of claim 8, wherein: The coating layer (102) is fixedly connected to the roller body of the embossing roller (1) by a fastener (3).

10. The lithium battery pole piece embosser of claim 1, wherein: Further comprising a matching roller, which forms a pair of rollers with the embossing roller (1); and grooves are arranged on the matching roller at positions corresponding to the embossing protrusions (2).

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