Slitting knife and slitting device

Abstract

The utility model relates to a slitting knife and a slitting device. The slitting device comprises a first slitting knife assembly and a second slitting knife assembly, wherein the first slitting knife assembly comprises a first slitting knife; the second slitting knife assembly comprises a second slitting knife, the side, facing the second slitting knife, of the first slitting knife is provided with a first abutting face, and the side, facing the first slitting knife, of the second slitting knife is provided with a second abutting face; the first slitting knife abuts against the second abutting face of the second slitting knife through the first abutting face. Wherein the first slitting knife and the second slitting knife can be controlled to reversely rotate, so that the first slitting knife and the second slitting knife can be used for shearing a material belt; at least one of the first abutting face and the second abutting face is provided with a groove, and at least part of the groove is located in the area where the first abutting face and the second abutting face make contact with each other.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing equipment, in particular to a slitting knife and a slitting device. Background Art

[0002] In the manufacturing process of lithium batteries, since the area of ​​the manufactured pole pieces is very large, in order to meet the requirements of lithium battery pole pieces of different specifications, it is necessary to use a slitting tool to cut the pole pieces. The slitting tool adopts an upper and lower cutter rolling cutting structure, with the upper blade close to the lower blade, and the pole piece is cut into strips after passing through the overlap of the upper and lower cutters. However, in the prior art, the upper and lower cutters have a high wear rate and friction between them will generate heat, resulting in a low life of the upper and lower cutters, and they need to be replaced frequently. Utility Model Content

[0003] Based on this, it is necessary to provide a slitting knife and slitting device that improves the above defects, in order to address the problem that the upper and lower cutters of the slitting tool in the prior art have a short life due to the high wear rate and the friction between them generating heat.

[0004] A slitting device, comprising:

[0005] A first slitting knife assembly includes a first slitting knife; and

[0006] The second slitting knife assembly comprises a second slitting knife, wherein the first slitting knife has a first abutting surface on a side facing the second slitting knife, and the second slitting knife has a second abutting surface on a side facing the first slitting knife; the first slitting knife abuts against the second abutting surface of the second slitting knife through the first abutting surface;

[0007] Wherein, the first slitting knife and the second slitting knife can be controlled to rotate in opposite directions so that the first slitting knife and the second slitting knife can shear the material strip; at least one of the first abutting surface and the second abutting surface has a groove, and the groove is at least partially located in the area where the first abutting surface and the second abutting surface contact each other.

[0008] In one embodiment, the cutting depth of the first slitting knife and the second slitting knife is 1 mm to 5 mm.

[0009] In one embodiment, the groove on the first abutting surface is a first groove, the first slitting knife is in a disc shape, the first groove is in a circular ring shape, and the central axis of the first groove is colinear with the central axis of the first slitting knife.

[0010] In one embodiment, the cutting depth H of the first slitting knife and the second slitting knife satisfies: H≥(D11-D21); wherein D11 is the outer diameter of the first slitting knife, and D21 is the outer diameter of the first groove.

[0011] In one embodiment, the first groove satisfies: 0.1mm≤(D11-D21)≤1mm, 0.5≤(D21-D31)≤10mm; wherein D11 is the outer diameter of the first slitting knife, D21 is the outer diameter of the first groove, and D31 is the inner diameter of the first groove.

[0012] In one embodiment, the groove on the second abutting surface is a second groove, the second slitting knife is in a disc shape, the second groove is in a circular ring shape, and the central axis of the second groove is colinear with the central axis of the second slitting knife.

[0013] In one embodiment, the cutting depth H of the first slitting knife and the second slitting knife satisfies: H≥(D12-D22); wherein D12 is the outer diameter of the second slitting knife, and D22 is the outer diameter of the second groove.

[0014] In one embodiment, the second groove satisfies: 0.1mm≤(D12-D22)≤1mm, 0.5≤(D22-D32)≤10mm; wherein D12 is the outer diameter of the second slitting knife, D22 is the outer diameter of the second groove, and D32 is the inner diameter of the second groove.

[0015] In one embodiment, there are multiple first slitting knives and multiple second slitting knives, and the multiple first slitting knives correspond one-to-one to the multiple second slitting knives, and the first abutting surface of each first slitting knife abuts against the second abutting surface of the corresponding second slitting knife.

[0016] A slitting knife is in the shape of a disc. One side of the slitting knife in the axial direction has a contact surface, which is used to abut against another knife. A groove is provided on the contact surface, and at least part of the groove is located in the area where the contact surface and the other knife contact.

[0017] The above-mentioned slitting knife and slitting device, since a groove is provided on the first abutting surface of the first slitting knife and / or the second abutting surface of the second slitting knife, and at least part of the groove is located in the area where the first abutting surface and the second abutting surface contact each other, the contact area between the first abutting surface and the second abutting surface is reduced by utilizing the groove, thereby being able to increase the cutting amount of the first slitting knife and the second slitting knife as much as possible without causing an increase in the frictional heat generated between the first slitting knife and the second slitting knife, which is beneficial to extending the service life of the first slitting knife and the second slitting knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the upper knife and the lower knife of the slitting device in the prior art;

[0019] Figure 2 It is a cross-sectional view of an upper knife and a lower knife in the prior art;

[0020] Figure 3 It is a schematic diagram of the structure when the upper knife and the lower knife cut the material strip in the prior art;

[0021] Figure 4 It is a curve showing the change of the contact arc length between the upper knife and the material strip as the cutting depth in the prior art;

[0022] Figure 5 is a curve showing the change of the contact area between the upper knife and the lower knife (i.e. the tool contact area) with the cutting amount in the prior art;

[0023] Figure 6 This is a schematic diagram of the structure of a slitting device in one embodiment of the present application;

[0024] Figure 7 This is a schematic structural diagram of a first slitting knife and a second slitting knife of a slitting device in one embodiment of the present application;

[0025] Figure 8 for Figure 7 The structural schematic diagram of the first slitting knife shown;

[0026] Fig. 9 This is a schematic structural diagram of a first slitting knife and a second slitting knife of a slitting device in another embodiment of the present application;

[0027] Fig.10 for Fig. 9 The structural schematic diagram of the second slitting knife shown;

[0028] Fig.11 This is a schematic structural diagram of a first slitting knife and a second slitting knife of a slitting device in another embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0035] Before describing the slitting knife and slitting device provided in the present application, Figures 1 to 5 Describe the prior art. Figure 1 and Figure 2 As shown, the slitting device in the prior art includes an upper knife 100 and a lower knife 200, which are circular slitting knives arranged in pairs and abut against each other. The upper knife 100 and the lower knife 200 have a certain cutting depth, which is generally less than or equal to 0.2 mm.

[0036] See also Figure 3 As shown, when the upper knife 100 and the lower knife 200 rotate in opposite directions and cut the material strip a, the upper knife 100 and the material strip a come into contact and cut in the shearing triangle area b. When the cutting depth of the upper knife 100 and the lower knife 200 is small, the contact arc length AC of the upper knife 100 and the material strip a in the shearing triangle area b is large. Figure 4 The curve of the contact arc length AC changing with the cutting depth is shown. Figure 4 As can be seen from the figure, as the cutting depth decreases, the contact arc length AC between the upper knife 100 and the material strip a increases sharply, which causes the wear rate of the upper knife 100 to increase sharply, thereby reducing the service life of the upper knife 100. The situation of the lower knife 200 is similar to that of the upper knife 100, so it will not be described here.

[0037] The cutting depth of the upper blade 100 and the lower blade 200 not only affects the contact arc length AC, but also affects the contact area S between the upper blade 100 and the lower blade 200. ADBE The size of Figure 5 The contact area S between the upper blade 100 and the lower blade 200 is shown. ADBE The curve of the change with the cutting depth. Figure 5 It can be seen that as the cutting depth increases, the contact area S between the upper knife 100 and the lower knife 200 increases. ADBE The increase in the contact area between the upper blade 100 and the lower blade 200 will increase the frictional heat generated during the slitting of the material strip a, thereby reducing the service life of the upper blade 100 and the lower blade 200.

[0038] In summary, when the cutting depth is set to a larger value, although the contact arc length AC between the upper knife 100 and the lower knife 200 and the material strip a will decrease, the contact area S ADBE The larger the friction is, the more heat is generated between the two, which will also result in a shorter service life of the upper knife 100 and the lower knife 200.

[0039] When the cutting depth is set to a smaller value, although the contact area S between the upper knife 100 and the lower knife 200 is ADBE The contact arc length AC between the upper blade 100 and the lower blade 200 and the material strip a will be increased, thereby increasing the wear rate of the upper blade 100 and the lower blade 200, and also resulting in a lower service life of the upper blade 100 and the lower blade 200. Therefore, it is necessary to provide a slitting knife and a slitting device that can increase the service life.

[0040] See also Figures 6 to 8 An embodiment of the utility model provides a slitting device, including a first slitting knife assembly 10 and a second slitting knife assembly 20. The first slitting knife assembly 10 includes a first slitting knife 11. The second slitting knife assembly 20 includes a second slitting knife 21 arranged along a preset direction X with the first slitting knife 11. The first slitting knife 11 has a first abutting surface 111 on a side facing the second slitting knife 21, and the second slitting knife 21 has a second abutting surface 211 on a side facing the first slitting knife 11. The first abutting surface 111 and the second abutting surface 211 abut against each other.

[0041] The first slitting knife 11 and the second slitting knife 21 can be controlled to rotate in opposite directions so that the first slitting knife 11 and the second slitting knife 21 can shear the material strip, thereby realizing the slitting of the material strip. At least one of the first abutting surface 111 and the second abutting surface 211 has a groove, and the groove is at least partially located in the area where the first abutting surface 111 and the second abutting surface 211 contact each other. It should be noted that the material strip can be a pole piece (i.e., a positive pole piece or a negative pole piece), or other material strips that need to be slit, which is not limited here.

[0042] In this way, the slitting device shears the material strip entering between the first slitting knife 11 and the second slitting knife 21 through the reverse rotation of the first slitting knife 11 and the second slitting knife 21, thereby realizing the slitting of the material strip. Since a groove is provided on the first abutting surface 111 of the first slitting knife 11 and / or the second abutting surface 211 of the second slitting knife 21, and at least part of the groove is located in the area where the first abutting surface 111 and the second abutting surface 211 contact each other, the contact area between the first abutting surface 111 and the second abutting surface 211 is reduced by using the groove, thereby being able to increase the cutting amount of the first slitting knife 11 and the second slitting knife 21 as much as possible without causing an increase in the frictional heat generated between the first slitting knife 11 and the second slitting knife 21, which is conducive to extending the service life of the first slitting knife 11 and the second slitting knife 21.

[0043] Specifically in the embodiment, the number of the first slitting knives 11 and the second slitting knives 21 can be multiple. The multiple first slitting knives 11 correspond to the multiple second slitting knives 21 one by one, and the first abutting surface 111 of each first slitting knife 11 abuts against the second abutting surface (211) of the corresponding second slitting knife 21. In this way, each group of corresponding first slitting knives 11 and second slitting knives 21 can cut the material strip, thereby realizing the cutting of the material strip into multiple sub-material strips. For example, when the material strip needs to be cut into two sub-material strips, the number of the first slitting knives 11 and the second slitting knives 21 are both 1. When the material strip needs to be cut into three sub-material strips, the number of the first slitting knives 11 and the second slitting knives 21 are both 2. When the material strip needs to be cut into four sub-material strips, the number of the first slitting knives 11 and the second slitting knives 21 are both 3.

[0044] It should be noted that the present application also provides a slitting knife, which can be the first slitting knife 11 of the slitting device or the second slitting knife 21 of the slitting device.

[0045] Please continue to see Figure 6 In the embodiment of the present application, the first slitting knife assembly 10 further includes a first knife shaft 12 and a first rotation driving member 16. The first slitting knife 11 is sleeved on the first knife shaft 12 to rotate synchronously with the first knife shaft 12. The first rotation driving member 16 is drivingly connected to the first knife shaft 12 so that the first rotation driving member 16 can drive the first knife shaft 12 to rotate.

[0046] The second slitting knife assembly 20 also includes a second knife shaft 22 and a second rotating drive member 26. The axial directions of the second knife shaft 22 and the first knife shaft 12 are parallel to the preset direction X. The second slitting knife 21 is sleeved on the second knife shaft 22 to rotate synchronously with the second knife shaft 22. The second rotating drive member 26 is drivingly connected to the second knife shaft 22 so that the second rotating drive member 26 can drive the second knife shaft 22 to rotate. In this way, the first rotating drive member 16 drives the first knife shaft 12 to rotate around its own axis, thereby driving the first slitting knife 11 to rotate. At the same time, the second rotating drive member 26 drives the second knife shaft 22 to rotate around its own axis, thereby driving the second slitting knife 21 to rotate in a direction opposite to the rotation direction of the first slitting knife 11, so that the first slitting knife 11 and the second slitting knife 21 cooperate to achieve shearing of the material strip.

[0047] Furthermore, the first blade shaft 12 and the second blade shaft 22 are arranged at intervals in a direction perpendicular to the preset direction X. The side of the first slitting knife 11 close to the second slitting knife 21 in the preset direction X is the first abutting surface 111, and the side of the second slitting knife 21 close to the first slitting knife 11 in the preset direction X is the second abutting surface 211. The first slitting knife 11 abuts against the second abutting surface 211 of the second slitting knife 21 along the preset direction X through the first abutting surface 111. In this way, by adjusting the distance between the first blade shaft 12 and the second blade shaft 22, the cutting amount of the first slitting knife 11 and the second slitting knife 21 can be adjusted.

[0048] Furthermore, the first slitting knife assembly 10 also includes a first spacer sleeve 13 mounted on the first knife shaft 12, and the first spacer sleeve 13 is arranged on both sides of the first slitting knife 11 in the preset direction X, so that the first spacer sleeve 13 is used to position the first slitting knife 11 in the preset direction X.

[0049] The second slitting knife assembly 20 further includes a second spacer 23 sleeved on the second knife shaft 22, and the second spacer 23 is provided on both sides of the second slitting knife 21 in the preset direction X, so that the second spacer 23 is used to position the second slitting knife 21 in the preset direction X. In this way, the first slitting knife 11 and the second slitting knife 21 are positioned in the preset direction X by the first spacer 13 and the second spacer 23, respectively, so that the first abutting surface 111 of the first slitting knife 11 abuts against the second abutting surface 211 of the second slitting knife 21.

[0050] Furthermore, the first slitting knife assembly 10 also includes an elastic mechanism 15, which is arranged between the side of the first slitting knife 11 away from the first abutment surface 111 and the corresponding first spacer 13. The elastic mechanism 15 is used to provide a preload force that allows the first slitting knife 11 to have a movement tendency along a preset direction X toward the second slitting knife 21. Under the action of the preload force, the first slitting knife 11 and the second slitting knife 21 can maintain mutual abutment during the process of slitting the material strip. It should be noted that the elastic mechanism 15 can use elastic elements such as springs to provide the above-mentioned preload force, and the specific structure is not limited here.

[0051] Optionally, the cutting depth H of the first slitting knife 11 and the second slitting knife 21 satisfies: 1mm≤H≤5mm. Compared with the cutting depth of approximately 0.2mm in the prior art, the cutting depth H of the first slitting knife 11 and the second slitting knife 21 is greatly improved in the present application, thereby reducing the contact arc length of the first slitting knife 11 and the second slitting knife 21 with the material strip, respectively, thereby greatly slowing down the wear speed of the first slitting knife 11 and the second slitting knife 21. At the same time, due to the presence of the above-mentioned groove, the contact area between the first slitting knife 11 and the second slitting knife 21 is greatly reduced, thereby greatly reducing the friction heat generated between the first slitting knife 11 and the second slitting knife 21, which is conducive to extending the service life of the first slitting knife 11 and the second slitting knife 21. It should be noted that the cutting depth H of the first slitting knife 11 and the second slitting knife 21 can be 1mm, 2mm, 3mm, 4mm or 5mm, etc., which is not limited here.

[0052] See also Figure 7 and Figure 8 In some embodiments, the first abutting surface 111 is provided with the above-mentioned groove. For the convenience of description, the groove on the first abutting surface 111 is named as the first groove 112. The first slitting knife 11 is in the shape of a disc, that is, the first slitting knife 11 is a circular slitting knife. The first groove 112 is in the shape of a circular ring, and the central axis of the first groove 112 is colinear with the central axis of the first slitting knife 11. In this way, the first groove 112 is designed to be a circular ring that is colinear with the central axis of the first slitting knife 11, so as to ensure that when the first slitting knife 11 and the second slitting knife 21 rotate in opposite directions to any angle, there are parts of the first groove 112 in the contact area between the first abutting surface 111 of the first slitting knife 11 and the second abutting surface 211 of the second slitting knife 21, thereby ensuring that the contact area between the first slitting knife 11 and the second slitting knife 21 will not increase when the first slitting knife 11 and the second slitting knife 21 rotate relative to each other to any angle.

[0053] Furthermore, the cutting depth H of the first slitting knife 11 and the second slitting knife 21 satisfies: H≥(D11-D21); wherein D11 is the outer diameter of the first slitting knife 11, and D21 is the outer diameter of the first groove 112. In this way, it is ensured that the first groove 112 is at least partially located in the contact area between the first slitting knife 11 and the second slitting knife 21, thereby reducing the contact area between the first slitting knife 11 and the second slitting knife 21.

[0054] It should be noted that the first groove 112 is provided on the first abutting surface 111 of the first slitting knife 11, and the peripheral edge of the first slitting knife 11 is a blade. If the first groove 112 is too close to the blade, the strength of the blade will be affected. If the first groove 112 is too far from the blade, the contact area between the first slitting knife 11 and the second slitting knife 21 will not be reduced or the reduction effect will be weakened. In addition, the radial dimension of the first groove 112 will also affect the effect of reducing the contact area between the first slitting knife 11 and the second slitting knife 21.

[0055] In order to ensure that the first groove 112 has a better effect of reducing the contact area between the first slitting knife 11 and the second slitting knife 21, and to reduce the influence on the blade strength of the first slitting knife 11, it is necessary to design the position and size of the first groove 112. In some embodiments, the first groove 112 satisfies: 0.1mm≤(D11-D21)≤1mm, 0.5≤(D21-D31)≤10mm; wherein D11 is the outer diameter of the first slitting knife 11, D21 is the outer diameter of the first groove 112, and D31 is the inner diameter of the first groove 112. In this way, it can be ensured that the first groove 112 does not affect the blade strength of the first slitting knife 11, and the contact area between the first slitting knife 11 and the second slitting knife 21 can be reduced to meet the design requirements.

[0056] Optionally, the depth of the first groove 112 is 0.05 mm to 0.5 mm. It is understandable that the depth of the first groove 112 can be set according to the specifications of the first slitting knife 11, which is not limited here.

[0057] It should be noted that the first groove 112 is not limited to a circular ring shape. In other embodiments, other shapes may also be used as long as they can reduce the contact area between the first slitting knife 11 and the second slitting knife 21. This is not limited here.

[0058] See also Figures 9 and 10In some embodiments, the second abutting surface 211 is provided with the above-mentioned groove. For the convenience of description, the groove on the second abutting surface 211 is named as the second groove 212. The second slitting knife 21 is in the shape of a disc, that is, the second slitting knife 21 is a circular slitting knife. The second groove 212 is in the shape of a circular ring, and the central axis of the second groove 212 is colinear with the central axis of the second slitting knife 21. In this way, the second groove 212 is designed to be a circular ring that is colinear with the central axis of the second slitting knife 21, so as to ensure that when the first slitting knife 11 and the second slitting knife 21 rotate in the opposite direction to each other to any angle, there are parts of the second groove 212 in the area where the first abutting surface 111 of the first slitting knife 11 and the second abutting surface 211 of the second slitting surface contact each other, thereby ensuring that the contact area between the first slitting knife 11 and the second slitting knife 21 will not increase when the first slitting knife 11 and the second slitting knife 21 rotate in the opposite direction to each other to any angle.

[0059] Furthermore, the cutting depth H of the first slitting knife 11 and the second slitting knife 21 satisfies: H≥(D12-D22); wherein D12 is the outer diameter of the second slitting knife 21, and D22 is the outer diameter of the second groove 212. In this way, it is ensured that the second groove 212 is at least partially located in the area where the first abutting surface 111 and the second abutting surface 211 contact, thereby achieving the purpose of reducing the contact area between the first slitting knife 11 and the second slitting knife 21.

[0060] It should be noted that the second groove 212 is provided on the second abutting surface 211 of the second slitting knife 21, and the peripheral edge of the second slitting knife 21 is a blade. If the second groove 212 is too close to the blade, the strength of the blade will be affected. If the second groove 212 is too far from the blade, the contact area between the first slitting knife 11 and the second slitting knife 21 will not be reduced or the reduction effect will be poor. In addition, the radial dimension of the second groove 212 will also affect the effect of reducing the contact area between the first slitting knife 11 and the second slitting knife 21.

[0061] In order to ensure that the second groove 212 has a better effect on reducing the contact area between the first slitting knife 11 and the second slitting knife 21, and to avoid affecting the blade strength of the second slitting knife 21, the position and size of the second groove 212 need to be designed. In some embodiments, the second groove 212 satisfies: 0.1mm≤(D12-D22)≤1mm, 0.5≤(D22-D32)≤10mm; wherein D12 is the outer diameter of the second slitting knife 21, D22 is the outer diameter of the second groove 212, and D32 is the inner diameter of the second groove 212. In this way, it can ensure that the second groove 212 has little effect on the blade strength of the second slitting knife 21, and can reduce the contact area between the first slitting knife 11 and the second slitting knife 21 to meet the design requirements.

[0062] Optionally, the depth of the second groove 212 is 0.05 mm to 0.5 mm. It is understandable that the depth of the second groove 212 can be set according to the specifications of the second slitting knife 21, which is not limited here.

[0063] It should be noted that the second groove 212 is not limited to a circular ring shape. In other embodiments, other shapes may also be used as long as they can reduce the contact area between the first slitting knife 11 and the second slitting knife 21. This is not limited here.

[0064] It should also be noted that in some embodiments, see Figure 7 As shown, the first abutting surface 111 of the first slitting knife 11 is provided with a first groove 112, and the second abutting surface 211 of the second slitting knife 21 is not provided with a second groove 212. Fig. 9 As shown, the first abutting surface 111 of the first slitting knife 11 does not have a first groove 112, and the second abutting surface 211 of the second slitting knife 21 has a second groove 212. In some other embodiments, see Fig.11 As shown, a first groove 112 is formed on the first abutting surface 111 of the first slitting knife 11 , and a second groove 212 is formed on the second abutting surface 211 of the second slitting knife 21 .

[0065] It should also be noted that the first slitting knife 11 can be a sharp knife or a flat knife, and the second slitting knife 21 can also be a sharp knife or a flat knife, which is not limited here. Figure 6 In the illustrated embodiment, the first slitting knife 11 is a sharp knife, and the second slitting knife 21 is a flat knife.

[0066] The following is a comparison between a pair of comparisons and the embodiment of the present application. In the comparison, a slitting knife in the prior art is used to slit the pole piece, and the service life data of the slitting knife within six months is counted. Figure 7 The slitting knife shown is used to slit the electrodes of the same specification, and the service life data of the slitting knife within six months is statistically calculated. The parameters of the slitting knife in the comparative example and the embodiment of the present application are shown in Table 1:

[0067] Table 1 Parameters of the slitting knife in the comparative example and the embodiment of the present application

[0068]

[0069] In the comparative example: the total slitting mileage is 8.3 million meters, the slitting knife consumption is 38, and the service life of the slitting knife is 218,000 meters / piece. In the embodiment of the present application: the total slitting mileage is 11.2 million meters, the slitting knife consumption is 25, and the service life of the slitting knife is 448,000 meters / piece. It can be seen that the service life of the slitting knife in the embodiment of the present application is much greater than the service life of the slitting knife in the comparative example, indicating that the design of the groove can significantly improve the service life of the slitting knife.

[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A slitting device, characterized in that: include: A first slitting knife assembly (10), comprising a first slitting knife (11); and A second slitting knife assembly (20) comprises a second slitting knife (21), wherein the first slitting knife (11) has a first abutting surface (111) on a side facing the second slitting knife (21), and the second slitting knife (21) has a second abutting surface (211) on a side facing the first slitting knife (11); the first slitting knife (11) abuts against the second abutting surface (211) of the second slitting knife (21) via the first abutting surface (111); The first slitting knife (11) and the second slitting knife (21) can be controlled to rotate in opposite directions so that the first slitting knife (11) and the second slitting knife (21) can shear the material strip; at least one of the first abutting surface (111) and the second abutting surface (211) has a groove, and the groove is at least partially located in the area where the first abutting surface (111) and the second abutting surface (211) contact each other.

2. The slitting device according to claim 1, characterized in that: The cutting depth of the first slitting knife (11) and the second slitting knife (21) is 1 mm to 5 mm.

3. The slitting device according to claim 1, characterized in that: The groove on the first abutting surface (111) is a first groove (112); the first slitting knife (11) is disc-shaped; the first groove (112) is annular; and the central axis of the first groove (112) is colinear with the central axis of the first slitting knife (11).

4. The slitting device according to claim 3, characterized in that: The cutting depth H of the first slitting knife (11) and the second slitting knife (21) satisfies: H≥(D11-D21); wherein D11 is the outer diameter of the first slitting knife (11), and D21 is the outer diameter of the first groove (112).

5. The slitting device according to claim 3, characterized in that: The first groove (112) satisfies: 0.1mm≤(D11-D21)≤1mm, 0.5≤(D21-D31)≤10mm; wherein D11 is the outer diameter of the first slitting knife (11), D21 is the outer diameter of the first groove (112), and D31 is the inner diameter of the first groove (112).

6. The slitting device according to claim 1, characterized in that: The groove on the second abutting surface (211) is a second groove (212); the second slitting knife (21) is in the shape of a disk; the second groove (212) is in the shape of a circular ring; and the central axis of the second groove (212) is colinear with the central axis of the second slitting knife (21).

7. The slitting device according to claim 6, characterized in that: The cutting depth H of the first slitting knife (11) and the second slitting knife (21) satisfies: H≥(D12-D22); wherein D12 is the outer diameter of the second slitting knife (21), and D22 is the outer diameter of the second groove (212).

8. The slitting device according to claim 6, characterized in that: The second groove (212) satisfies: 0.1mm≤(D12-D22)≤1mm, 0.5≤(D22-D32)≤10mm; wherein D12 is the outer diameter of the second slitting knife (21), D22 is the outer diameter of the second groove (212), and D32 is the inner diameter of the second groove (212).

9. The slitting device according to any one of claims 1 to 8, characterized in that: The number of the first slitting knives (11) and the number of the second slitting knives (21) are both multiple, and the multiple first slitting knives (11) correspond one to one with the multiple second slitting knives (21), and the first abutting surface (111) of each first slitting knife (11) abuts against the second abutting surface (211) of the corresponding second slitting knife (21).

10. A slitting knife, characterized in that: The slitting knife is disc-shaped, and one side of the slitting knife in the axial direction has a supporting surface, which is used to abut against another tool. A groove is provided on the supporting surface, and at least part of the groove is located in the area where the supporting surface contacts the other tool.

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