Pole cutting device and battery production line

Abstract

The utility model discloses a pole piece cutting device and a battery production line, and relates to the technical field of battery production. The pole piece cutting device includes a frame, a first cutter structure and a second cutter structure. The first cutter structure is installed on the frame and is provided with a first blade. The second cutter structure is installed on the frame, and at least one of the second cutter structure and the first cutter structure can move relative to the frame in a first direction, and the first cutter structure and the second cutter structure are close to each other to bite and cut off the pole piece. The second cutter structure includes a second blade and a positioning surface, and when the first cutter structure and the second cutter structure are in relative motion in the first direction, the first cutter structure can contact the positioning surface and slide along the positioning surface, and the first cutter structure and the second blade are provided with a gap in the second direction, and the second direction is set at an angle to the first direction. The technical solution of the utility model can improve the cutting accuracy of pole piece cutting.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a pole piece cutting device and a battery production line. Background Art

[0002] During the battery production process, the electrode sheets are usually cut using a cutting device. However, the upper cutter and the lower cutter of the traditional cutting device contact each other when they are engaged, and the blades of the upper cutter and the lower cutter will wear, so the cutting accuracy is low when cutting the electrode sheets. Utility Model Content

[0003] The main purpose of the utility model is to provide a pole piece cutting device and a battery production line, aiming to improve the problem of low cutting accuracy of the pole piece by the pole piece cutting device.

[0004] In order to achieve the above-mentioned purpose, the pole piece cutting device proposed in the utility model includes a frame, a first cutter structure and a second cutter structure. The first cutter structure is installed on the frame and is provided with a first blade. The second cutter structure is installed on the frame, and at least one of the second cutter structure and the first cutter structure can move relative to the frame in a first direction, so that the first cutter structure and the second cutter structure are close to each other to bite and cut off the pole piece. The second cutter structure includes a second blade and a positioning surface, and when the first cutter structure and the second cutter structure are in relative motion in the first direction, the first cutter structure can contact the positioning surface and slide along the positioning surface, and a gap is provided between the first cutter structure and the second blade in the second direction, and the second direction is set at an angle to the first direction.

[0005] The technical solution of the utility model enables the frame to stably support the first and second cutter structures by installing both the first and second cutter structures on the frame. The effect of cutting the pole piece is achieved by enabling at least one of the first cutter structures to move relative to the frame in the first direction and enabling the first and second cutter structures to engage with each other. The second cutter structure includes a second blade and a positioning surface. When the first and second cutter structures move relative to each other along the first direction, the first cutter structure can contact the positioning surface. Therefore, the positioning surface can provide a good guide and support basis for the relative movement of the first and second cutter structures, thereby reducing the risk of the first cutter structure and / or the second cutter structure tilting when moving in the first direction.

[0006] By providing a gap between the first cutting knife structure and the second cutting edge in the second direction, and the second direction being set at an angle to the first direction, when the first cutting knife structure slides on the relative positioning surface, there will be no mutual wear between the first cutting edge and the second cutting edge of the first cutting knife structure, thereby improving the sharpness of the second cutting edge, and making the first cutting edge and the second cutting edge no longer squeeze the pole piece off by extrusion, but cut the pole piece in the cutting direction, thereby reducing burrs generated when the pole piece is cut and improving cutting accuracy.

[0007] In addition, by providing a positioning surface on the second cutter structure so that the first cutter structure contacts the positioning surface instead of directly contacting the second blade, the gap between the first blade and the second blade of the first cutter structure in the second direction can be changed by changing the distance between the positioning surface and the second blade in the second direction, thereby reducing the risk of difficulty in accurately adjusting the gap between the first blade and the second blade in the second direction by other devices.

[0008] In one embodiment of the utility model, the second cutting knife structure includes a blade portion and a knife support portion. The blade portion is provided with the second blade, the second blade has a length extension direction, and the first direction and the second direction are both arranged at an angle to the length extension direction. The knife support portion and the blade portion are connected to each other along the length extension direction, and the knife support portion is provided with the positioning surface, and the plane where the positioning surface is located is located between the second blade and the first blade in the second direction.

[0009] Such an arrangement is conducive to achieving the effect of forming a gap between the first cutter structure and the second cutter structure, and reducing the risk of the first blade and the second blade abutting against each other due to assembly errors.

[0010] In an embodiment of the present invention, two blade support portions are provided, and the two blade support portions are respectively connected to two opposite ends of the blade portion along the length extension direction.

[0011] Such an arrangement improves the stability and balance of the first cutter structure when in contact with the positioning surface, and reduces the risk of the second cutter structure or the first cutter structure shaking at one end along the length extension direction of the second blade.

[0012] In one embodiment of the present invention, the second blade has a length extension direction, in which the second blade has two opposite ends and a middle portion arranged between the two opposite ends; the middle portion is recessed along the first direction toward a direction away from the first cutting knife structure.

[0013] Such an arrangement can reduce the risk of breaking the pole piece, and can also reduce the risk of burrs or wavy curling at the end of the pole piece.

[0014] In an embodiment of the present invention, the second blade includes a first connecting surface and a second connecting surface, the first connecting surface is arranged parallel to the first direction, and the first connecting surface and the second connecting surface are arranged at a non-right angle.

[0015] Such an arrangement makes the second blade sharper, thereby facilitating the second blade to effectively cut the pole piece.

[0016] In one embodiment of the utility model, the first blade has a first surface facing the positioning surface and a second surface set at an angle to the first surface, the angle between the first surface and the positioning surface is θ1, 34.5°≤θ1≤35.5°, and the angle between the second surface and the second direction is θ2, 34.5°≤θ2≤35.5°.

[0017] Such an arrangement enables the first blade to have a more appropriate sharpness, thereby improving the cutting accuracy of the electrode piece.

[0018] In an embodiment of the present invention, the pole piece cutting device further comprises an elastic pressing component, the elastic pressing component is retracted along the second direction, and the elastic pressing component abuts against the first cutting blade structure.

[0019] Such an arrangement can adjust the pressure on the first cutter structure, and further adjust the holding force of the first cutter structure on the positioning surface, so that the pole piece cutting device in this embodiment can be adapted to cutting pole pieces of different thicknesses or toughnesses.

[0020] In one embodiment of the utility model, the elastic clamping assembly includes an elastic member and an adjusting bolt. The elastic member is retracted along the second direction, and one end of the elastic member is connected to the first cutter structure, and the other end extends in a direction away from the frame. The adjusting bolt is passed through the elastic member along the second direction, and one end of the adjusting bolt abuts against one end of the elastic member away from the frame, and the other end passes through the first cutter structure and is threadedly connected to the frame.

[0021] Such an arrangement makes the elastic pressing assembly simple in structure, with a small number of parts and components and low cost.

[0022] In an embodiment of the utility model, the frame is provided with a mounting groove, the first cutter structure is installed in the mounting groove and can slide along the second direction, and the first cutter structure is gap-matched with the side wall of the mounting groove.

[0023] Such an arrangement can provide a good guiding effect for the movement of the first cutter structure in the second direction.

[0024] In an embodiment of the present invention, a gap formed between the first cutting structure and the side wall of the mounting groove is defined as L, where 0<L≤50 μm.

[0025] Such an arrangement can ensure that the first cutter structure can slide smoothly in the installation groove, and can avoid the risk of shaking of the first cutter structure due to excessive gap between the first cutter structure and the side wall of the installation groove.

[0026] In one embodiment of the utility model, the pole piece cutting device further comprises a guide sleeve and a guide column. One of the frame and the second cutter structure is provided with a guide hole, and a guide sleeve is installed in the guide hole. The other of the frame and the second cutter structure is fixedly connected to the guide column, and the guide column is slidably inserted into the guide sleeve along the first direction.

[0027] Such an arrangement enables the second cutter structure to have a good guiding effect when it moves relative to the frame along the first direction, and reduces the wear and sliding friction between the second cutter structure and the frame.

[0028] The utility model also provides a battery production line, comprising the above-mentioned pole piece cutting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of the exploded structure of the pole piece cutting device of some embodiments of the utility model;

[0031] Figure 2 It is a schematic diagram of the exploded structure of a battery cell of some embodiments of the utility model;

[0032] Figure 3 It is a schematic diagram of the three-dimensional structure of the first cutting knife structure and the second cutting knife structure in the electrode cutting device of some embodiments of the utility model in the bite state;

[0033] Figure 4 for Figure 3 Rear view of

[0034] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0035] Figure 6It is a partial structural schematic diagram of the second cutting knife structure in the pole piece cutting device of some embodiments of the utility model;

[0036] Figure 7 A half-section view of a pole piece cutting device according to some embodiments of the utility model;

[0037] Figure 8 A schematic diagram of a three-dimensional structure of a pole piece cutting device in some embodiments of the utility model from one perspective;

[0038] Fig. 9 for Figure 8 A partial enlarged view of point B in the middle;

[0039] Fig.10 It is a schematic diagram of the three-dimensional structure of the pole piece cutting device of some embodiments of the utility model from another perspective.

[0040] Description of Figure Numbers:

[0041] 10. Box body;

[0042] 20. Battery cell; 21. End cap; 21a. Electrode terminal; 22. Shell; 23. Electrode assembly; 23a. Tab;

[0043] 100, rack; 101, mounting slot;

[0044] 200, first cutting knife structure; 210, first knife holder; 220, first main knife body; 221, first blade; 221a, first surface; 221b, second surface;

[0045] 300, second cutter structure; 310, blade portion; 311, second blade; 311a, first connecting surface; 311b, second connecting surface; 320, knife support portion; 321, positioning surface; 330, second knife holder;

[0046] 400, elastic pressing assembly; 410, elastic member; 420, adjusting bolt;

[0047] 500, guide sleeve;

[0048] 600, guide column;

[0049] 700, driving device;

[0050] X, first direction;

[0051] Y, second direction;

[0052] Z, length extension direction.

[0053] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0055] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0056] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0057] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0058] like Figure 1As shown, the battery in the utility model includes a box body 10 and a battery cell 20, and the battery cell 20 is contained in the box body 10. Among them, the box body 10 is used to provide a storage space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first part and a second part, the first part and the second part cover each other, and the first part and the second part jointly define a storage space for accommodating the battery cell 20. The second part can be a hollow structure with an opening at one end, and the first part can be a plate-like structure, and the first part covers the open side of the second part, so that the first part and the second part jointly define a storage space; the first part and the second part can also be hollow structures with one side opening, and the open side of the first part covers the open side of the second part. Of course, the box body 10 formed by the first part and the second part can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0059] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0060] Please refer to Figure 2 , Figure 2 The following is a schematic diagram of the exploded structure of a battery cell 20 provided in some embodiments of the present invention. The battery cell 20 refers to the smallest unit that constitutes a battery. Figure 2 The battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23 and other functional components.

[0061] The end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminal 21a can be used to electrically connect with the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the utility model does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 21, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0062] The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 22 and the end cap 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 21 at the opening. Without limitation, the end cap 21 and the shell 22 can also be integrated. Specifically, the end cap 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the end cap 21 covers the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the utility model does not impose any special restrictions on this.

[0063] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 23, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 23a. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a connects the electrode terminals to form a current loop.

[0064] In the battery, there can be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, please refer to Figure 2 The battery may also be a battery cell assembly formed by connecting a plurality of battery cells 20 in series, in parallel or in hybrid connection, and then connecting a plurality of battery cell assemblies in series, in parallel or in hybrid connection to form a whole and accommodated in the box 10. The battery may also include other structures, for example, the battery may also include a busbar component for realizing electrical connection between the plurality of battery cells 20.

[0065] The positive and negative electrode sheets in the electrode assembly 23 need to be cut during the production process, and the electrode sheets are usually cut using an electrode sheet cutting device. The electrode sheets usually include copper foil or aluminum foil, and the surface of the copper foil or aluminum foil is also covered with other film layers. The upper cutter and the lower cutter of the traditional cutting device are in contact with each other when they are engaged, and the blades of the upper cutter and the lower cutter will wear, and the upper cutter and the lower cutter squeeze the electrode sheet by extrusion, so it is easy for the electrode sheet to be delaminated or burred, resulting in low cutting accuracy when the traditional cutting device cuts the electrode sheet.

[0066] In order to improve the problem of low precision in cutting pole pieces by conventional pole piece cutting devices, the utility model provides a pole piece cutting device.

[0067] Please refer to Figures 3 to 7 In the technical solution of the utility model, the pole piece cutting device includes a frame 100, a first cutter structure 200 and a second cutter structure 300. The first cutter structure 200 is installed on the frame 100 and is provided with a first blade 221. The second cutter structure 300 is installed on the frame 100, and at least one of the second cutter structure 300 and the first cutter structure 200 can move relative to the frame 100 in the first direction X, so that the first cutter structure 200 and the second cutter structure 300 are close to each other and bite and cut the pole piece. The second cutter structure 300 includes a second blade 311 and a positioning surface 321. When the first cutter structure 200 and the second cutter structure 300 move relative to each other in the first direction X, the first cutter structure 200 can contact the positioning surface 321 and slide along the positioning surface 321, and the first cutter structure 200 and the second blade 311 are provided with a gap T in the second direction Y, and the second direction Y is set at an angle with the first direction X.

[0068] The frame 100 is a bracket for mounting the first cutter structure 200 and the second cutter structure 300. The frame 100 may include a first mounting portion for mounting the first cutter structure 200 and a second mounting portion for mounting the second cutter structure 300, wherein the first mounting portion and the second mounting portion may be an integrated structure, for example, the first mounting portion and the second mounting portion may be integrally formed in an L-shape or a gantry bracket shape, or the first mounting portion and the second mounting portion may be separate structures.

[0069] The first cutting structure 200 is used to engage with the second cutting structure 300 to cut the pole piece. At least one of the first cutting structure 200 and the second cutting structure 300 can move relative to the frame 100 in the first direction X, and the first direction X can be a vertical direction or a horizontal direction. Taking the first direction X as a vertical direction as an example, the first cutting structure 200 can be arranged above the second cutting structure 300, or the first cutting structure 200 can be arranged below the second cutting structure 300. Specifically, the first cutter structure 200 can be a fixed component, and the second cutter structure 300 moves upward relative to the first cutter structure 200 to approach the first cutter structure 200 and engage with the first cutter structure 200; or the second cutter structure 300 is a fixed component, and the first cutter structure 200 moves downward relative to the second cutter structure 300 to approach the second cutter structure 300; or both the first cutter structure 200 and the second cutter structure 300 can move, the first cutter structure 200 moves downward and the second cutter structure 300 moves upward, so as to achieve the effect that the first cutter structure 200 and the second cutter structure 300 are close to each other and can engage with each other.

[0070] When the first cutter structure 200 is fixed, the first cutter structure 200 can be installed on the frame 100 by bolt connection, snap connection or welding. When the second cutter structure 300 is fixed, the second cutter structure 300 can be installed on the frame 100 by bolt connection, snap connection or welding. When the first cutter structure 200 can move relative to the frame 100 in the first direction X, the first cutter structure 200 can be slidably installed on the frame 100 through the slide rail slider assembly, and can also be slidably installed on the frame 100 through the guide column guide sleeve 500 assembly. When the second cutter structure 300 can move relative to the frame 100 in the first direction X, the second cutter structure 300 can be slidably installed on the frame 100 through the slide rail slider assembly, and can also be slidably installed on the frame 100 through the guide column guide sleeve 500 assembly.

[0071] The first cutting structure 200 may include only a first main cutting body 220, which is provided with a first cutting edge 221. Alternatively, the first cutting structure 200 may include a first main cutting body 220 and a first cutting frame 210 for mounting the first main cutting body 220, wherein the first main cutting body 220 is provided with a first cutting edge 221.

[0072] The second cutter structure 300 may only include a second main cutter body, which is provided with a second blade 311. Alternatively, the second cutter structure 300 may include a second main cutter body and a second cutter holder 330 for mounting the second main cutter body, wherein the second main cutter body is provided with a second blade 311. In addition, the second cutter structure 300 further includes a positioning surface 321, which may be provided on the second main cutter body, or the second cutter structure 300 may further include a knife support portion 320 connected to the second main cutter body, which is provided with a positioning surface 321.

[0073] The second direction Y is set at an angle with the first direction X. Taking the first direction X as a vertical direction as an example, the second direction Y can be a horizontal direction, or the second direction Y can be a direction that is at an angle with both the horizontal direction and the vertical direction. The first cutting knife structure 200 can contact with the positioning surface 321 and has a gap T with the second blade 311 in the second direction Y. Then, the plane where the positioning surface 321 is located can be located on the side of the second blade 311 close to the first cutting knife structure 200 along the second direction Y. For example, the size of the knife portion 320 provided with the positioning surface 321 in the second direction Y is greater than the size of the second main knife body in the second direction Y, so that the positioning surface 321 of the knife portion 320 is closer to the first cutting knife structure 200 in the second direction Y and can contact the first cutting knife structure 200. Or the size of the knife portion 320 provided with the positioning surface 321 in the second direction Y is smaller than the size of the second main knife body in the second direction Y, so that a groove structure is formed between the positioning surface 321 and the second main knife body, and the first cutting knife structure 200 may include a first main knife body 220 provided with a first blade 221 and a matching portion connected to the first main knife body 220, the matching portion is inserted into the groove structure and contacts the bottom wall of the groove, and the second blade 311 of the second main knife body is located in the concave space formed by the first main knife body 220 and the matching portion, but the second blade 311 does not contact the first blade 221 of the first main knife body 220. It should be noted that when a gap T is provided between the first cutting knife structure 200 and the second blade 311 in the second direction Y, the gap T can be set according to the thickness adaptability of the cut pole piece.

[0074] The technical solution of the utility model enables the frame 100 to stably support the first cutter structure 200 and the second cutter structure 300 by installing both the first cutter structure 200 and the second cutter structure 300 on the frame 100. By enabling at least one of the first cutter structures 200 to move relative to the frame 100 in the first direction X and enabling the first cutter structure 200 and the second cutter structure 300 to engage with each other, the effect of cutting the pole piece can be achieved. The second cutter structure 300 includes a second blade 311 and a positioning surface 321. When the first cutter structure 200 and the second cutter structure 300 move relative to each other along the first direction X, the first cutter structure 200 can contact the positioning surface 321. Therefore, the positioning surface 321 can provide a good guide and support basis for the relative movement of the first cutter structure 200 and the second cutter structure 300, thereby reducing the risk of the first cutter structure 200 and / or the second cutter structure 300 tilting when moving in the first direction X. By providing a gap T between the first cutting knife structure 200 and the second cutting edge 311 in the second direction Y, and the second direction Y is set at an angle to the first direction X, when the first cutting knife structure 200 slides on the relative positioning surface 321, there will be no mutual wear between the first cutting knife structure 200 and the second cutting edge 311, thereby improving the sharpness of the second cutting edge 311, and making the first cutting edge 221 and the second cutting edge 311 no longer squeeze the pole piece off by extrusion, but cut the pole piece in the cutting direction, thereby reducing the burrs generated when the pole piece is cut, and improving the cutting accuracy.

[0075] In addition, by providing a positioning surface 321 on the second cutter structure 300 so that the first cutter structure 200 contacts the positioning surface 321 instead of directly contacting the second blade 311, the gap T between the first blade 221 and the second blade 311 of the first cutter structure 200 in the second direction Y can be changed by changing the distance between the positioning surface 321 and the second blade 311 in the second direction Y, thereby reducing the risk of difficulty in accurately adjusting the gap T between the first blade 221 and the second blade 311 in the second direction Y by other devices.

[0076] Please refer to Figures 3 to 6 In one embodiment of the utility model, the second cutting knife structure 300 includes a blade portion 310 and a knife support portion 320. The blade portion 310 is provided with a second blade edge 311, and the second blade edge 311 has a length extension direction Z, and the first direction X and the second direction Y are both set at an angle to the length extension direction Z. The knife support portion 320 and the blade portion 310 are connected to each other along the length extension direction Z, and the knife support portion 320 is provided with a positioning surface 321, and the plane where the positioning surface 321 is located is located between the second blade edge 311 and the first blade edge 221 in the second direction Y.

[0077] The blade portion 310 refers to the main component of the second cutter structure 300 for cutting the pole piece. The blade portion 310 can be a rectangular parallelepiped, a disc or other shapes. When the blade portion 310 is provided with a second blade 311, the second blade 311 has a length extension direction Z, and the first direction X and the second direction Y are both arranged at an angle to the length extension direction Z. For example, when the first direction X is a vertical direction and the second direction Y is a horizontal direction, the length extension direction Z of the second blade 311 can be another horizontal direction perpendicular to the second direction Y.

[0078] The knife support portion 320 refers to a portion for the first cutter structure 200 to support. The knife support portion 320 can be in a rectangular shape, a semi-cylindrical shape or other shapes. When the knife support portion 320 and the blade portion 310 are connected to each other along the length extension direction Z, there can be only one knife support portion 320, and the knife support portion 320 can be connected to any end of the blade portion 310 along the length extension direction Z. Or there can be two knife support portions 320, and the two knife support portions 320 are respectively connected to the two ends of the blade portion 310 that are arranged opposite to each other along the length extension direction Z. When the knife support portion 320 and the blade portion 310 are connected to each other, the two can be connected by welding, integral molding or screw connection.

[0079] When the plane where the positioning surface 321 is located is located between the second blade 311 and the first blade 221 in the second direction Y, specifically, when the backing portion 320 is connected to the blade portion 310, its connection position in the second direction Y is changed toward the direction close to the first cutting knife structure 200, or the thickness of the backing portion 320 can be increased to achieve that the plane where the positioning surface 321 of the backing portion 320 is located is located between the second blade 311 and the first blade 221 in the second direction Y.

[0080] By connecting the knife support portion 320 and the blade portion 310 along the length extension direction Z of the second blade 311, the positioning surface 321 on the knife support portion 320 can provide an escape space for the first blade 221 and the second blade 311 to engage with each other to cut the pole piece. By locating the plane where the positioning surface 321 is located between the first blade 221 and the second blade 311 in the second direction Y, it can be achieved that the first cutting knife structure 200 can first contact the positioning surface 321 and effectively isolate from the second blade 311, which is conducive to achieving the effect of forming a gap T between the first cutting knife structure 200 and the second cutting knife structure 300, reducing the risk of the first blade 221 and the second blade 311 still abutting against each other due to assembly error or adjustment error, effectively reducing the risk of wear of the second blade 311, and improving the cutting accuracy.

[0081] like Figure 6As shown, in one embodiment of the present invention, two blade support portions 320 are provided, and the two blade support portions 320 are respectively connected to two opposite ends of the blade portion 310 along the length extension direction Z.

[0082] Such an arrangement enables the first cutter structure 200 to contact the positioning surfaces 321 of the two knife-rest portions 320 at the same time, thereby improving the stability and balance of the contact between the first cutter structure 200 and the positioning surfaces 321, and reducing the risk of the second cutter structure 300 or the first cutter structure 200 shaking at one end along the length extension direction Z of the second blade 311.

[0083] In one embodiment of the present invention, the second blade 311 has a length extension direction Z. In the length extension direction Z, the second blade 311 has two opposite ends and a middle portion arranged between the two opposite ends; the middle portion is recessed in a direction away from the first cutting structure 200 along the first direction X.

[0084] Specifically, when the middle portion is recessed in the direction away from the first cutting blade structure 200 along the first direction X, the end portion to the middle portion may be arranged in an inclined surface or in an arc shape.

[0085] It can be understood that when the pole piece is cut, when the pole piece is placed at the second blade 311, the tension at both ends of the second blade 311 in the length extension direction Z is small, while the tension in the middle position in the length extension direction Z is large. Therefore, the present application concave the middle part in the direction away from the first cutting knife structure 200 along the first direction X, so that when the pole piece is cut, the first cutting knife structure 200 and the second cutting knife structure 300 are close to each other and bite, the double lever principle is used to cut from both ends of the pole piece to the middle part, thereby reducing the risk of squeezing the pole piece off, and can also reduce the risk of burrs or wavy curling at the ends of the pole piece.

[0086] like Figure 6 As shown, in one embodiment of the present invention, the second blade 311 includes a first connecting surface 311a and a second connecting surface 311b, the first connecting surface 311a is arranged parallel to the first direction X, and the first connecting surface 311a and the second connecting surface 311b are arranged at a non-right angle.

[0087] Such a configuration can make the second blade 311 sharper, so that the second blade 311 can effectively cut the pole piece, reducing the risk of the pole piece being delaminated by extrusion, thereby improving the accuracy of cutting the pole piece.

[0088] Please refer to Figures 3 to 5In one embodiment of the utility model, the first blade 221 has a first surface 221a facing the positioning surface 321 and a second surface 221b set at an angle to the first surface 221a, the angle between the first surface 221a and the positioning surface 321 is θ1, 34.5°≤θ1≤35.5°, and the angle between the second surface 221b and the second direction Y is θ2, 34.5°≤θ2≤35.5°.

[0089] Specifically, the angle θ1 between the first surface 221a and the positioning surface 321 may be 34.5°, 34.6°, 34.7°, 34.8°, 34.9°, 35°, 35.1°, 35.2°, 35.3°, 35.4° or 35.5°, etc. The angle θ2 between the second surface 221b and the second direction Y may be 34.5°, 34.6°, 34.7°, 34.8°, 34.9°, 35°, 35.1°, 35.2°, 35.3°, 35.4° or 35.5°, etc.

[0090] Such a configuration reduces the risk of the first blade 221 being too sharp and easy to wear, and also avoids the risk of the first blade 221 being too blunt due to a large angle. By setting the angle θ1 between the first surface 221a and the positioning surface 321 to 34.5°≤θ1≤35.5°, and the angle θ2 between the second surface 221b and the second direction Y to 34.5°≤θ2≤35.5°, the first blade 221 is within a good sharp angle, thereby making the cutting of the pole piece more accurate, and improving the accuracy of the pole piece cutting device in cutting the pole piece.

[0091] like Figure 7 As shown, in one embodiment of the present invention, the pole piece cutting device further includes an elastic pressing assembly 400 , which is retractable along the second direction Y, and the elastic pressing assembly 400 abuts against the first cutting blade structure 200 .

[0092] The elastic pressing assembly 400 refers to an assembly used to provide elastic force for the first cutter structure 200 in the second direction Y, and to enable the first cutter structure 200 to be pressed against the positioning surface 321 of the second cutter structure 300. The elastic pressing assembly 400 may include a spring or a spring sheet, one end of which may be connected to the first cutter structure 200, and the other end may extend to the outside of the first cutter structure 200 along the second direction Y toward a side away from the frame 100, or the other end may abut against the frame 100 along the second direction Y. The elastic pressing assembly 400 may also include a driving member that abuts against the spring or the spring sheet, and the driving member may drive the spring to extend and retract, for example, it may include a bolt, a screw nut assembly, or a gear rack assembly. Specifically, when the driving member is a bolt, one end of the bolt abuts against the spring or the spring sheet, and the other end of the bolt is provided with a spring or the spring sheet along the second direction Y and is threadedly connected to the frame 100, so as to adjust the compression amount of the spring or the spring sheet by adjusting the threaded engagement length of the bolt 420 and the frame 100. Similarly, when the driving member is a screw-nut assembly, one end of the spring or one end of the spring sheet is fixedly connected to the nut, and the other end is connected to the first cutter structure 200; the nut is threadedly matched with the screw, the screw is rotatably connected to the frame 100, and the screw extends along the second direction Y. When the driving member includes a gear rack assembly, the gear is rotatably provided on the frame 100, the rack meshes with the gear and extends along the second direction Y, one end of the spring or one end of the spring sheet is fixedly connected to the rack, and the other end is connected to the first cutter structure 200.

[0093] By setting up an elastic clamping component 400, the elastic clamping component 400 expands and contracts along the second direction Y and resists the first cutter structure 200. The expansion and contraction amount of the elastic clamping component 400 can be adjusted to adjust the pressure on the first cutter structure 200, and then the resistance force of the first cutter structure 200 on the positioning surface 321 can be adjusted, so that the pole piece cutting device in this embodiment can adapt to cutting pole pieces of different thicknesses or different toughnesses.

[0094] Please refer to Figure 7 As shown, in one embodiment of the present utility model, the elastic pressing assembly 400 includes an elastic member 410 and an adjusting bolt 420. The elastic member 410 is retracted along the second direction Y, and one end of the elastic member 410 is connected to the first cutter structure 200, and the other end extends in a direction away from the frame 100. The adjusting bolt 420 is penetrated in the elastic member 410 along the second direction Y, and one end of the adjusting bolt 420 abuts against the end of the elastic member 410 away from the frame 100, and the other end penetrates the first cutter structure 200 and is threadedly connected to the frame 100.

[0095] The elastic member 410 is a component for providing elastic resistance, for example, the elastic member 410 may be a spring or a spring. When one end of the elastic member 410 is connected to the first cutter structure 200, the connection effect between the two can be achieved by abutting, bonding, plugging or welding.

[0096] The adjusting bolt 420 is a component for adjusting the expansion and contraction amount of the elastic member 410 .

[0097] By stretching the elastic member 410 along the second direction Y, and one end of the elastic member 410 is connected to the first cutter structure 200, and the other end extends in the direction away from the frame 100; the adjusting bolt 420 passes through the elastic member 410 along the second direction Y, and one end of the adjusting bolt 420 abuts against the end of the elastic member 410 away from the frame 100, and the other end passes through the first cutter structure 200 and is threadedly connected to the frame 100, then the thread engagement length of the adjusting bolt 420 and the frame 100 can be changed, thereby changing the elastic expansion amount of the elastic member 410, thereby achieving the effect of changing the abutment force of the elastic member 410 on the first cutter structure 200, and thereby achieving the effect of changing the pressure between the first cutter structure 200 and the positioning surface 321, so that the pole piece cutting device in this embodiment can be adapted to cutting pole pieces of different thicknesses or different toughnesses. In addition, such a configuration also makes the elastic clamping assembly 400 simple in structure, with a small number of parts and low cost.

[0098] Please refer to Figure 8 and Fig. 9 In one embodiment of the utility model, the frame 100 is provided with a mounting groove 101, the first cutter structure 200 is installed in the mounting groove 101 and can slide along the second direction Y, and the first cutter structure 200 is matched with the side wall clearance of the mounting groove 101.

[0099] By providing a mounting groove 101 on the frame 100 , the first cutter structure 200 is installed in the mounting groove 101 and can slide along the second direction Y. Then, the mounting groove 101 can provide a good guiding effect for the movement of the first cutter structure 200 in the second direction Y.

[0100] like Fig. 9 As shown, further, the distance between the first cutting structure 200 and the side wall of the mounting groove 101 is defined as L, 0<L≤50μm.

[0101] The side wall of the mounting groove 101 refers to a surface in the mounting groove 101 that is parallel to the second direction Y or a surface that forms an acute angle with the second direction Y.

[0102] By forming a gap between the first cutter structure 200 and the side wall of the mounting groove 101, it is convenient for the first cutter structure 200 to slide in the mounting groove 101. Specifically, the distance L between the first cutter structure 200 and the side wall of the mounting groove 101 can be 10 μm, 20 μm, 30 μm, 40 μm or 50 μm, etc., as long as the gap L satisfies 0<L≤50 μm.

[0103] By setting the distance L between the first cutter structure 200 and the side wall of the mounting groove 101 to 0<L≤50μm, on the one hand, it can be ensured that the first cutter structure 200 can slide smoothly in the mounting groove 101, and on the other hand, the risk of the first cutter structure 200 shaking due to the large distance between the first cutter structure 200 and the side wall of the mounting groove 101 can be avoided.

[0104] Please refer to Figure 7 , Figure 8 as well as Fig.10 In one embodiment of the present invention, the pole piece cutting device further comprises a guide sleeve 500 and a guide post 600. One of the frame 100 and the second cutter structure 300 is provided with a guide hole, and the guide sleeve 500 is installed in the guide hole. The other of the frame 100 and the second cutter structure 300 is fixedly connected to the guide post 600, and the guide post 600 is slidably inserted into the guide sleeve 500 along the first direction X.

[0105] The guide sleeve 500 refers to a component that is sleeved on the outside of the guide column 600. On the one hand, it can reduce the sliding friction between the two components provided with the guide sleeve 500 and the guide column 600, and on the other hand, it can reduce the risk of wear between the two components.

[0106] The guide post 600 refers to a columnar structure for inserting into the guide sleeve 500. The guide post 600 can be fixed on the frame 100, or can be fixed on the second cutter structure 300. When the guide post 600 is fixed on the frame 100, a guide hole is provided on the second cutter structure 300, and the guide sleeve 500 is installed in the guide hole; when the guide post 600 is fixed on the second cutter structure 300, a guide hole is provided on the frame 100, and the guide sleeve 500 is installed in the guide hole. Specifically, the shapes of the guide post 600 and the guide sleeve 500 are adapted. For example, when the guide post 600 is cylindrical, the guide sleeve 500 is cylindrical; when the guide post 600 is prismatic, the guide sleeve 500 is also a prismatic cylindrical structure.

[0107] By providing a guide hole in one of the frame 100 and the second cutter structure 300, and the other of them is fixedly connected to the guide column 600, and the guide sleeve 500 is installed in the guide hole, and the guide column 600 is slidably arranged in the guide sleeve 500 along the first direction X, the second cutter structure 300 has a good guiding effect when moving relative to the frame 100 along the first direction X, and the wear and sliding friction between the second cutter structure 300 and the frame 100 are reduced.

[0108] Further, please refer to Figure 8 and Fig.10 The pole piece cutting device also includes a driving device 700, which is transmission-connected to the second cutting knife structure 300 and drives the second cutting knife structure 300 to move in the first direction X.

[0109] The driving device 700 refers to a driving component for driving the second cutter structure 300 to move in the first direction X. The driving device 700 may be a linear motor or a cylinder. Alternatively, the driving device 700 includes a motor and a gear rack assembly connected to the motor. Alternatively, the driving device 700 includes a screw nut assembly, wherein the screw is rotatably mounted on the frame 100 and extends along the first direction X, and the nut is disposed on the second cutter structure 300. The driving device 700 may be connected to the frame 100, or may be disposed independently of the frame 100.

[0110] By providing a driving device 700 that is transmission-connected to the second cutter structure 300 , the second cutter structure 300 can be automatically driven to move in the first direction X by the driving device 700 , thereby facilitating the user's automation requirements for the pole piece cutting device.

[0111] The utility model also provides a battery production line. The battery production line includes a pole piece cutting device, and the specific structure of the pole piece cutting device refers to the above embodiment. Since the battery production line adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0112] The above are only exemplary embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pole piece cutting device, characterized in that: include: frame; a first cutting structure, which is mounted on the frame and is provided with a first cutting edge; as well as A second cutter structure, wherein the second cutter structure is mounted on the frame, and at least one of the second cutter structure and the first cutter structure can move relative to the frame in a first direction, so that the first cutter structure and the second cutter structure are close to each other and bite and cut off the pole piece; The second cutting blade structure includes a second cutting edge and a positioning surface; When the first cutter structure and the second cutter structure are in relative motion in the first direction, the first cutter structure can contact the positioning surface and slide along the positioning surface, and a gap is provided between the first cutter structure and the second blade in the second direction, and the second direction is set at an angle to the first direction.

2. The pole piece cutting device according to claim 1, characterized in that: The second cutting blade structure comprises: a blade portion, wherein the blade portion is provided with the second blade edge, the second blade edge has a length extension direction, and the first direction and the second direction are both arranged at an angle to the length extension direction; and The knife support portion is connected to the blade portion along the length extension direction, and the knife support portion is provided with the positioning surface. The plane where the positioning surface is located is located between the second blade and the first blade in the second direction.

3. The pole piece cutting device according to claim 2, characterized in that: The two blade support parts are respectively connected to two ends of the blade part which are arranged opposite to each other along the length extension direction.

4. The pole piece cutting device according to claim 2, characterized in that: In the length extension direction, the second blade has two opposite ends and a middle portion arranged between the two opposite ends; the middle portion is recessed in a direction away from the first cutting knife structure along the first direction.

5. The pole piece cutting device according to any one of claims 1 to 4, characterized in that: The second blade includes a first connecting surface and a second connecting surface, the first connecting surface is arranged parallel to the first direction, and the first connecting surface and the second connecting surface are arranged at a non-right angle; And / or, the first blade has a first surface facing the positioning surface and a second surface set at an angle to the first surface; the angle between the first surface and the positioning surface is θ1, 34.5°≤θ1≤35.5°, and the angle between the second surface and the second direction is θ2, 34.5°≤θ2≤35.5°.

6. The pole piece cutting device according to any one of claims 1 to 4, characterized in that: The pole piece cutting device further comprises an elastic pressing component, which is retracted and stretched along the second direction and abuts against the first cutting knife structure.

7. The pole piece cutting device according to claim 6, characterized in that: The elastic pressing component comprises: an elastic member, the elastic member being retractable along the second direction, one end of the elastic member being connected to the first cutter structure, and the other end of the elastic member extending in a direction away from the frame; and An adjusting bolt is passed through the elastic member along the second direction, one end of the adjusting bolt abuts against an end of the elastic member away from the frame, and the other end passes through the first cutter structure and is threadedly connected to the frame.

8. The pole piece cutting device according to claim 6, characterized in that: The frame is provided with a mounting groove, and the first cutter structure is installed in the mounting groove and can slide along the second direction.

9. The pole piece cutting device according to claim 8, characterized in that: A gap formed between the first cutting structure and the side wall of the mounting groove is defined as L, where 0<L≤50 μm.

10. The pole piece cutting device according to any one of claims 1 to 4, characterized in that: The pole piece cutting device also includes: A guide sleeve, wherein one of the frame and the second cutter structure is provided with a guide hole, and a guide sleeve is installed in the guide hole; and A guide post, the other of the frame and the second cutter structure is fixedly connected to the guide post, and the guide post is slidably inserted into the guide sleeve along the first direction.

11. A battery production line, characterized in that: It comprises a pole piece cutting device as claimed in any one of claims 1 to 10.

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