Pole piece embossing structure and embossing processing device

Abstract

The utility model belongs to the technical field of battery production, and particularly relates to a pole piece embossing structure and an embossing processing device. Wherein the pole piece embossing structure comprises an embossing roller and a supporting roller which are arranged side by side; an embossing gap is formed between the embossing roller and the supporting roller; a flat contact surface is arranged on the surface of the supporting roller; and embossing convex parts and embossing concave parts which are alternately arranged are arranged on the embossing roller. According to the utility model, the external stress caused by the embossed convex part can be effectively buffered, so that the internal stress of the pole piece body can be released, and the problems of edge warping, winding feeding folding, pole piece wrinkling after winding and the like of the pole piece body can be greatly improved; and the processing quality and efficiency are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery production, and in particular relates to a pole piece embossing structure and an embossing processing device. Background Art

[0002] Nowadays, all countries are vigorously developing green and efficient secondary batteries. As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. They have broad application prospects in portable appliances, power tools, large energy storage, and electric transportation power supply. However, with the advent of 5G, market demand continues to increase, and customers' requirements for battery safety are also getting higher and higher.

[0003] However, after the electrode is squeezed, stretched, heated and cooled during the processing, there is a large internal stress in the electrode, which leads to the edge of the electrode warping, the winding material is folded, and the electrode is wrinkled after winding. This results in poor processing quality of the electrode and affects its subsequent safety in battery use. Utility Model Content

[0004] The purpose of the utility model is to provide a pole piece embossing structure to improve the processing quality in view of the deficiencies of the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A pole piece embossing structure comprises an embossing roller and a supporting roller arranged side by side; an embossing gap is provided between the embossing roller and the supporting roller; a flat contact surface is provided on the surface of the supporting roller; and the embossing roller is provided with embossing protrusions and embossing depressions arranged alternately with each other.

[0007] Preferably, the embossing protrusions are embossing convex points; and the embossing convex points are arranged equidistantly on the outer surface of the embossing roller along a plane parallel to the radial direction of the embossing roller.

[0008] Preferably, the embossing convex point in the circumferential direction of the embossing roller at the first position is arranged between two adjacent embossing convex points in the circumferential direction of the embossing roller at the second position.

[0009] Preferably, the embossed convex portion is an embossed convex edge; the embossed convex edge and the embossed concave edge are alternately arranged along the surface of the embossing roller.

[0010] Preferably: a buffer slope is provided at a side end of the embossed convex portion; and the buffer slope is connected to the inner wall of the embossed concave portion.

[0011] Preferably, the opening of the embossed recess is gradually enlarged from the inner end of the buffer slope toward the outer end of the buffer slope.

[0012] Preferably: the thickness H of the embossed convex portion has a value range of: H = 0.05 mm to 4 mm;

[0013] And / or, an angle β is formed between the two central axes of two adjacent embossed protrusions 11; the value range of the angle β is: β=5°~50°;

[0014] And / or, the distance between the two central axes of two adjacent embossed protrusions is L; the value range of L is: L=2mm~20mm;

[0015] And / or, the width B of the embossed protrusion has a value range of: B = 1 mm to 5 mm.

[0016] Preferably, the diameter D of the embossing roller is in the range of D=10 mm to 50 mm.

[0017] Preferably: the support roller is an elastic colloid support roller; and / or the embossing roller is an elastic colloid embossing roller.

[0018] The utility model also discloses an embossing device, which comprises the pole piece embossing structure.

[0019] The beneficial effect of the utility model lies in that the technical scheme adopts the embossing effect of the embossing protrusions and embossing depressions of the embossing roller on one side end of the pole piece body and the embossing effect of the flat contact surface of the supporting roller on the other side end of the pole piece body. The supporting roller at the side end of the flat contact surface can reduce the external stress on the pole piece body and can also effectively buffer the external stress brought by the embossing protrusions, thereby realizing the release of the internal stress of the pole piece body, greatly improving the problems of edge warping of the pole piece body, folding of winding material, and wrinkling of the pole piece after winding, thereby improving the processing quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following will refer to the attached Figures 1 to 6 To describe the features, advantages and technical effects of exemplary embodiments of the present utility model.

[0021] Figure 1 This is a schematic structural diagram of a pole piece embossing structure of one embodiment of the utility model;

[0022] Figure 2 A cross-sectional view of a pole piece embossing structure according to one embodiment of the utility model;

[0023] Figure 3 A schematic diagram of the structure of an embossing roller of a pole piece embossing structure according to one embodiment of the utility model;

[0024] Figure 4 A cross-sectional view of an embossing roller of a pole piece embossing structure according to one embodiment of the utility model;

[0025] Figure 5 It is a structural schematic diagram of a pole piece embossing structure of another embodiment of the utility model;

[0026] Figure 6 This is a cross-sectional view of an embossing roller of a pole piece embossing structure according to another embodiment of the utility model.

[0027] In the figure: 1-embossing roller; 11-embossing convex part; 111-embossing convex point; 112-embossing convex edge; 12-embossing concave; 13-buffering inclined surface; 2-supporting roller; 21-flat contact surface; 3-pole body; 4-embossing gap. DETAILED DESCRIPTION

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0029] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0030] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship between the pole piece embossing structure and the embossing processing device to describe the associated objects, indicating that there may be three relationships, for example, A and / or B, which may indicate: A exists alone, A and B exist at the same time, and multiple situations exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are an "or" relationship between the pole piece embossing structure and the embossing processing device.

[0032] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0033] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0034] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] The following is combined with Figure 1 to Figure 6 The utility model is further described in detail, but it is not intended to limit the utility model.

[0036] like Figure 1 and 2 As shown, in one embodiment of the utility model, the pole piece embossing structure comprises an embossing roller 1 and a supporting roller 2 arranged side by side; and an embossing gap is provided between the embossing roller 1 and the supporting roller 2, and the embossing gap is used to guide the pole piece body 3 to be transported through; the surface of the supporting roller 2 is provided with a flat contact surface 21; the embossing roller 1 is provided with embossing protrusions 11 and embossing depressions 12 arranged alternately with each other.

[0037] The technical solution of the utility model adopts the embossing effect of the embossing protrusion and the embossing depression on one side end of the pole piece body and the embossing effect of the flat contact surface of the support roller on the other side end of the pole piece body. The support roller at the side end of the flat contact surface can reduce the external stress on the pole piece body and can also effectively buffer the external stress brought by the embossing protrusion, thereby realizing the release of the internal stress of the pole piece body, greatly improving the problems of edge warping of the pole piece body, folding of winding material, and wrinkling of the pole piece after winding, thereby improving the processing quality and efficiency.

[0038] Among them, in some embodiments, the support roller 2 is an elastic colloid support roller; this structure ensures the support stability of the pole piece body through the elastic colloid support roller, and can also effectively buffer the external stress applied to the pole piece body 3 from the embossing roller 1, thereby effectively protecting the pole piece body 3 and improving the stability and quality of the embossing process.

[0039] In some embodiments, the embossing roller 1 is an elastic colloid embossing roller; the embossing convex portion 11 is an elastic colloid convex portion; and the embossing roller 1 and the embossing convex portion 11 are integrally formed. This structure ensures the orderliness of the embossing operation on the pole piece body through the elastic colloid support roller, and can also ensure the external stress applied to the pole piece body 3 from the embossing convex portion 11, and can also avoid damage to the pole piece body 3, thereby effectively protecting the pole piece body 3 and improving the stability and quality of the embossing process.

[0040] Specifically, in some embodiments, Figure 2 As shown, a buffer slope 13 is provided at the side end of the embossed protrusion 11; the buffer slope 13 is connected with the inner wall of the embossed recess 12; and the opening of the embossed recess 12 near the inner end of the buffer slope 13 is smaller than the opening of the embossed recess 12 near the outer end of the buffer slope 13; that is, the opening of the embossed recess 12 gradually increases from the inner end of the buffer slope 13 toward the outer end of the buffer slope 13; thereby, direct impact on the pole piece body 3 when the angle tends to be a right angle can be avoided during the embossing process, thereby effectively protecting the pole piece body 3 and improving the stability and quality of the embossing process.

[0041] Specifically, in some embodiments, the thickness H of the embossed convex portion 11 is in the range of H = 0.05 mm to 4 mm. This structure can ensure the fluidity of the electrolyte between the positive and negative electrode sheets on the electrode body 3 through the embossed convex portion 11 of 0.05 mm to 4 mm, and can also ensure the structural stability of the positive and negative electrode sheets, thereby improving the processing quality and efficiency.

[0042] Specifically, in some embodiments, an angle β is formed between the two central axes of two adjacent embossed protrusions 11; the value range of the angle β is: β = 5° to 50°. This structure can ensure the stability of the embossed structure formed on the pole piece body 3 by taking a reasonable value of the angle β, and can also ensure the smooth flow of the electrolyte in the pole piece body 3 during use.

[0043] Specifically, in some embodiments, the distance between the two central axes of two adjacent embossed protrusions 11 is L; the value range of L is: L = 2mm ~ 20mm. This structure can ensure the embossing quantity of the pole piece body 3 through two embossed protrusions with a reasonable distance difference, and can also avoid damage to the pole piece body 3, thereby improving processing stability and quality.

[0044] Specifically, in some embodiments, the width B of the embossed protrusion 11 is in the range of B = 1 mm to 5 mm. The structure can prevent the electrode body 3 from being embossed and penetrated by the embossed protrusion with a reasonable width B, thereby avoiding electrolyte penetration during use, thereby improving the safety of use.

[0045] Further, in some embodiments, such as Figure 2 As shown, the embossed convex portion 11 is an embossed convex point 111; and the embossed convex points 111 are equidistantly arranged on the outer surface of the embossing roller 1 along a plane parallel to the radial direction of the embossing roller 1. That is to say, the embossed convex points 111 are arranged in a ring along the surface of the embossing roller 1, and form multiple groups of ring structures. Wherein, the buffer slope 13 is arranged on the side surface of the embossed convex point 111. Wherein, the embossed convex point 111 in the circumferential direction of the first position of the embossing roller 1 is arranged between two adjacent embossed convex points 111 in the circumferential direction of the second position of the embossing roller 1; wherein the first position is any position on the outer surface of the embossing roller 1; the second position is any position on the outer surface of the embossing roller 1, and does not overlap with the first position. That is to say, as Figure 3 As shown, the projection point of the embossed convex point 111 on one plane along the diameter section direction is located between the projection points of two adjacent embossed convex points 111 on the other plane along the circumferential diameter section direction, so as to achieve the staggered arrangement of the embossed convex points 111, thereby avoiding the stress applied by the embossing from being too concentrated on the same horizontal straight line, and then achieving the release of the internal stress of the pole piece body, greatly improving the problems of edge warping of the pole piece body, folding of the winding material, and wrinkling of the pole piece after winding; improving the processing quality and efficiency. Among them, as Figure 3 As shown, the plane where the thickness direction of the embossing roller 1 is located is the XZ plane. The value range of the thickness H1 of the embossed protrusion 111 is: H1 = 0.05mm~4mm. This structure can be realized on the electrode body 3 through the 0.05mm~4mm embossed protrusion 11 to ensure the fluidity of the electrolyte between the positive and negative electrode sheets, and can also ensure the structural stability of the positive and negative electrode sheets, and improve the processing quality and efficiency. The embossed protrusion 111 can be an embossed protrusion of a truncated cone structure or other irregular embossed protrusions with a buffer slope; of course, the embossed protrusion 111 can also be other structures with the same functional characteristics, which are not limited here.

[0046] Among them, Figure 4As shown, an angle β1 is formed between the two central axes of two adjacent embossed convex points 111; the value range of the angle β1 is: β1 = 5° to 50°; preferably, β1 = 30°. This structure can ensure the stability of the embossed structure formed on the pole piece body 3 by taking a reasonable value of the angle β1, and can also ensure the smooth flow of the electrolyte in the pole piece body 3 during use.

[0047] Among them, Figure 3 As shown, the distance between the two center axes of two adjacent embossed convex points 111 is L1; the value range of L1 is: L1 = 2mm ~ 20mm; preferably, L1 = 15mm. This structure can ensure the embossing quantity of the pole piece body 3 through the two embossed convex points 111 with a reasonable distance difference, and can also avoid damage to the pole piece body 3, thereby improving processing stability and quality.

[0048] Among them, Figure 3 As shown, the width B1 of the embossed convex point 111 ranges from B1 = 1 mm to 5 mm; preferably, B1 = 3 mm. This structure can prevent the electrode body 3 from being embossed and penetrated by the embossed convex point 111 with a reasonable width B, thereby avoiding electrolyte penetration during use, thereby improving safety in use.

[0049] Furthermore, in other embodiments, Figure 5 As shown, the embossed convex portion 11 is an embossed convex edge 112; the embossed convex edge 112 and the embossed concave edge 12 are alternately arranged along the surface of the embossing roller 1; and the length of the embossed convex edge 112 is less than or equal to the length of the embossing roller 1. Among them, the buffer slope 13 is arranged on the side surface of the embossed convex edge 112. In other words, an equidistant groove structure can be formed on the pole piece body 3 through the embossed convex edge 112, so that the external stress applied by the outside world can be quickly decomposed in the groove, thereby reducing the edge warping of the pole piece body 3, the folding of the winding material, and the wrinkling of the pole piece after winding. Among them, the embossed convex edge 112 is a cone embossed convex edge or other embossed convex edges with a buffer slope; of course, the embossed convex edge 112 can also be other structures with the same functional characteristics, which are not limited here.

[0050] Furthermore, the buffer slope 13 is arranged on the side surface of the embossed convex edge 112. The value range of the thickness H1 of the embossed convex edge 112 is: H2 = 0.05mm ~ 4mm. This structure can ensure the fluidity of the electrolyte between the positive and negative electrode sheets on the electrode body 3 through the 0.05mm ~ 4mm embossed convex portion 11, and can also ensure the structural stability of the positive and negative electrode sheets, thereby improving the processing quality and efficiency.

[0051] Among them, Figure 6As shown, an angle β2 is formed between two center axes in the thickness direction of two adjacent embossed convex edges 112; the value range of the angle β2 is: β2 = 5° to 50°; preferably, β2 = 25°. This structure can ensure the stability of the embossed structure formed on the pole piece body 3 by taking a reasonable value of the angle β2, and can also ensure the smooth flow of the electrolyte in the pole piece body 3 during use.

[0052] Among them, Figure 3 As shown, the distance between the two center axes of two adjacent embossed convex edges 112 is L2; ​​the value range of L2 is: L2 = 2mm ~ 20mm; preferably, L2 = 10mm. This structure can ensure the embossing quantity of the pole piece body 3 through the two embossed convex edges 112 with a reasonable distance difference, and can also avoid damage to the pole piece body 3, thereby improving processing stability and quality.

[0053] Among them, Figure 6 As shown, the width B2 of the embossed convex edge 112 ranges from B2 = 1 mm to 5 mm; preferably, B2 = 3 mm. This structure can prevent the electrode body 3 from being embossed and penetrated by the embossed convex edge 112 with a reasonable width B2, thereby avoiding electrolyte penetration during use, thereby improving safety in use.

[0054] Specifically, in some embodiments, the diameter D of the embossing roller 1 is in the range of D=10 mm to 50 mm.

[0055] The utility model also proposes an embossing processing device, which includes a pole piece embossing structure. The specific structure of the pole piece embossing structure refers to the above-mentioned embodiment. Since the embossing processing device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0056] Among them, the embossing processing device also includes a frame and a driving mechanism, the driving mechanism includes a first synchronous gear, a second synchronous gear and a driving motor; the driving motor is connected to the frame; the first synchronous gear is connected to the side end of the embossing roller 1; the second synchronous gear is connected to the side end of the supporting roller; the driving motor is connected to the first synchronous gear through a driving chain; the second synchronous gear is meshed with the first synchronous gear to make the embossing roller 1 and the supporting roller 2 rotate synchronously.

[0057] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0058] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A pole piece embossing structure, characterized in that: It comprises an embossing roller and a supporting roller arranged side by side; an embossing gap is arranged between the embossing roller and the supporting roller; a flat contact surface is arranged on the surface of the supporting roller; and the embossing roller is provided with embossing protrusions and embossing depressions arranged alternately with each other.

2. The pole piece embossing structure according to claim 1, characterized in that: The embossing convex parts are embossing convex points; and the embossing convex points are arranged at equal intervals on the outer surface of the embossing roller along a plane parallel to the radial direction of the embossing roller.

3. The pole piece embossing structure according to claim 2, characterized in that: The embossing convex point at the first position in the embossing roller in the circumferential direction is arranged between two adjacent embossing convex points at the second position in the embossing roller in the circumferential direction.

4. The pole piece embossing structure according to claim 1, characterized in that: The embossed convex part is an embossed convex edge; the embossed convex edge and the embossed concave edge are alternately arranged along the surface of the embossing roller.

5. The pole piece embossing structure according to any one of claims 1 to 4, characterized in that: A buffer slope is provided at the side end of the embossed convex portion; the buffer slope is connected with the inner wall of the embossed concave portion.

6. The pole piece embossing structure according to claim 5, characterized in that: The opening of the embossed recess is gradually enlarged from the inner end of the buffer slope toward the outer end of the buffer slope.

7. The pole piece embossing structure according to any one of claims 1 to 4, characterized in that: The thickness H of the embossed convex portion has a value range of: H = 0.05 mm to 4 mm; And / or, an angle β is formed between the two central axes of two adjacent embossed protrusions (11); the value range of the angle β is: β = 5° to 50°; And / or, the distance between the two central axes of two adjacent embossed protrusions is L; the value range of L is: L=2mm~20mm; And / or, the width B of the embossed protrusion has a value range of: B = 1 mm to 5 mm.

8. The pole piece embossing structure according to any one of claims 1 to 4, characterized in that: The diameter D of the embossing roller has a value range of: D=10mm-50mm.

9. The pole piece embossing structure according to any one of claims 1 to 4, characterized in that: The support roller is an elastic colloid support roller; and / or the embossing roller is an elastic colloid embossing roller.

10. An embossing device, characterized in that: The pole piece embossing structure comprises the pole piece embossing structure as described in any one of claims 1 to 9 above.

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