Compression roller and pole piece rolling equipment

Abstract

The utility model discloses a compression roller and pole piece rolling equipment, the compression roller is used for conducting punching operation on a pole piece material strap, the pole piece material strap can be separated to obtain a plurality of pole pieces, the compression roller comprises a compression roller body and a plurality of protruding parts, and the protruding parts are connected to the outer circumferential face of the compression roller body and distributed in the circumferential direction of the compression roller body; wherein the perimeter of the compression roller body is an integral multiple of the size of the pole piece along the first direction, and the integer is greater than or equal to 2. The perimeter of the compression roller body is set to be the integral multiple of the size of the pole piece in the first direction, so that continuous rolling can be performed under the condition that the compression roller body rolls the pole piece in the first direction, empty foil areas existing in the first direction are eliminated, empty foil areas needing to be cut are reduced, the production efficiency is improved, and the production cost is reduced. And the problem of material waste is solved.

Description

Technical Field

[0001] This application relates to the field of battery production equipment technology, and in particular to a pressure roller and electrode rolling equipment. Background Technology

[0002] Drilling is an important electrode processing method for electrochemical devices such as batteries and supercapacitors. It involves adding pores in the thickness direction of the electrode to improve the ion insertion / extraction kinetics of the inner layer of the electrode, while also increasing the electrode's capacity to store electrolyte, thereby improving the rate performance and cycle performance of the product.

[0003] In existing technologies, the main method for punching electrodes is roll forming to achieve continuous punching. However, existing roll forming methods are limited to uniform punching, i.e., punching holes uniformly along the electrode conveying direction. When dealing with the punching requirements of non-uniform pores on the electrode, there will be a lot of empty foil areas between two adjacent electrodes that need to be cut, which affects production efficiency and leads to material waste. Utility Model Content

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, in a first aspect, this application proposes a pressure roller that can solve the problem of material waste.

[0005] Secondly, this application proposes an electrode rolling device that uses the aforementioned pressure roller.

[0006] According to the first aspect of the present application, a pressure roller is used to perform a perforation operation on an electrode strip, wherein the electrode strip can be separated to obtain multiple electrodes, and the pressure roller includes a pressure roller body and multiple protrusions, wherein the multiple protrusions are connected to the outer peripheral surface of the pressure roller body and are distributed along the circumferential direction of the pressure roller body.

[0007] Wherein, the circumference of the pressure roller body is an integer multiple of the dimension of the electrode sheet along the first direction, and the integer is greater than or equal to 2.

[0008] The pressure roller according to the embodiments of this application has at least the following beneficial effects:

[0009] In this embodiment, the pressure roller is designed so that the circumference of the pressure roller body is an integer multiple of the size of the electrode sheet in the first direction. This allows for continuous rolling of the electrode sheet along the first direction, eliminating empty foil areas in the first direction, reducing the amount of empty foil that needs to be cut, improving production efficiency, and solving the problem of material waste.

[0010] According to some embodiments of this application, the diameter of the pressure roller body is... The protrusion height of the protrusion along the radial direction of the pressure roller body is The pressure roller satisfies:

[0011] .

[0012] Therefore, it can effectively prevent the deformation of the pores formed by the roller pressing on the electrode strip due to excessive angular velocity of the protrusion.

[0013] According to some embodiments of this application, the electrode strip includes a plurality of coating areas distributed along a second direction, the first direction intersecting the second direction, and the outer peripheral surface of the pressure roller body is provided with a plurality of sets of raised areas along the axial direction, and each set of raised areas is provided with a raised portion.

[0014] Wherein, along the axial direction of the pressure roller body, the width of a single raised area is equal to the dimension of a single coated area along the second direction.

[0015] Therefore, multiple electrodes can be synchronously rolled out along the second direction on the electrode strip.

[0016] According to some embodiments of this application, along the second direction, the electrode strip further includes a first empty foil area disposed between adjacent coating areas; along the axial direction of the pressure roller body, two adjacent sets of protrusion areas are spaced apart by a first distance;

[0017] Wherein, the first distance is equal to the dimension of the first empty foil area along the second direction.

[0018] This ensures that the raised area is aligned with the coating area on the electrode strip, and allows for roll forming and perforation of the coating area.

[0019] According to some embodiments of this application, the electrode strip further includes a second empty foil area disposed on the outermost side of the electrode strip along the second direction; along the axial direction of the pressure roller body, the outermost protrusion area is spaced apart from the end of the pressure roller body by a second distance;

[0020] The second distance is equal to the dimension of the second empty foil area along the second direction.

[0021] This ensures that the raised area aligns with the coating area on the electrode strip.

[0022] According to some embodiments of this application, the depth of the pores formed by the rolling of the electrode strip is... The protrusion height of the protrusion along the radial direction of the pressure roller body is The pressure roller satisfies: ,in ; and / or,

[0023] The maximum diameter of the pores formed by the roller pressing of the electrode strip is The maximum diameter of the protrusion is The pressure roller satisfies: ,in ; and / or,

[0024] The center-to-center distance between adjacent pores formed by the rolling of the electrode strip along the first direction is: The axial distance between adjacent protrusions along the circumferential direction of the pressure roller body is L, and the pressure roller satisfies: ,in .

[0025] This ensures the quality of the pores formed by the roller pressing.

[0026] According to an embodiment of the first aspect of this application, a pressure roller is used to perform a perforation operation on an electrode strip, wherein the electrode strip can be separated to obtain multiple electrodes, including:

[0027] The pressure roller body has at least one set of raised areas along the axial direction, and each set of raised areas includes a plurality of raised areas continuously arranged along the circumference of the pressure roller body.

[0028] Multiple sets of protrusions are connected to the outer peripheral surface of the pressure roller body, and each set of protrusions corresponds to a protrusion area. Each set of protrusions includes multiple protrusions.

[0029] Wherein, along the circumference of the pressure roller body, the length of a single protrusion area is equal to the dimension of a single electrode sheet along the first direction, and the plurality of protrusions in each protrusion area are not uniformly distributed.

[0030] The pressure roller according to the embodiments of this application has at least the following beneficial effects:

[0031] In this embodiment, the pressure roller has non-uniformly distributed protrusions in the circumferentially convex area of ​​the pressure roller body. When rolling the electrode strip, continuous non-uniform punching can be achieved. Furthermore, since the circumferentially convex area is continuously set, the empty foil area in the rolling direction is eliminated, which can solve the problems of low production efficiency and material waste.

[0032] According to some embodiments of this application, the protruding area includes a first sub-region and a second sub-region;

[0033] The protrusions are provided in both the first sub-region and the second sub-region, and the distribution density of the protrusions in the first sub-region is different from the distribution density of the protrusions in the second sub-region.

[0034] And / or, the protrusions are provided in both the first sub-region and the second sub-region, and the center distance between adjacent protrusions in the first sub-region is different from the center distance between adjacent protrusions in the second sub-region;

[0035] And / or, one of the first sub-region and the second sub-region is provided with the protrusion, while the other is not provided with the protrusion.

[0036] This enables the implementation of different forms of non-uniform drilling.

[0037] According to some embodiments of this application, the raised area sequentially includes a first sub-region, a second sub-region, and a third sub-region along the direction from the center outwards. The distribution density of the raised portions in the second sub-region is less than the distribution density in the first sub-region and / or the third sub-region. Therefore, it is possible to roll out pores of different densities in the central region, the edge region, and the transition region between them of the electrode sheet.

[0038] The electrode rolling apparatus according to the second aspect of this application includes the pressing rollers of any of the above embodiments.

[0039] The electrode rolling equipment according to the embodiments of this application has at least the following beneficial effects:

[0040] The electrode rolling equipment of this embodiment, by applying the above-mentioned pressure roller, can continuously roll along the belt direction of the electrode material, eliminating the empty foil area between adjacent electrodes in the belt direction, effectively improving production efficiency and solving the problem of material waste.

[0041] Additional aspects and advantages of this application will be set forth in part in the description which follows, and some of these additional aspects and advantages will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0042] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0043] Figure 1 This is a schematic diagram of one structure of the pressure roller body in this application;

[0044] Figure 2 This is a schematic diagram illustrating an alignment relationship between the pressure roller body and the electrode strip in this application;

[0045] Figure 3 This is a schematic diagram of a pore design for an electrode.

[0046] In the picture:

[0047] 100 - Pressure roller body; 101 - Raised area;

[0048] 200 - Protrusion;

[0049] 300-electrode strip, 301-electrode. Detailed Implementation

[0050] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0051] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0052] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0053] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0054] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] Reference Figure 1 and Figure 2 The embodiments of this application propose a pressure roller for punching holes in the electrode strip 300, and the electrode strip 300 can be separated to obtain multiple electrodes 301.

[0056] Reference Figure 1The pressure roller of this embodiment includes a pressure roller body 100 and a plurality of protrusions 200. The plurality of protrusions 200 are connected to the outer peripheral surface of the pressure roller body 100 and are distributed along the circumference of the pressure roller body 100. The circumference of the pressure roller body 100 is an integer multiple of the dimension of the electrode sheet 301 along the first direction, and the integer is greater than or equal to 2.

[0057] During the punching operation, the electrode strip 300 is conveyed along the first direction, and the pressure roller body 100 rotates synchronously, performing roller pressing and punching on the electrode strip 300 through the protrusions 200 connected to the outer peripheral surface. Since the circumference of the pressure roller body 100 is an integer multiple of the dimension of the electrode 301 along the first direction, the pressure roller body 100 can continuously press multiple electrodes 301 along the first direction on the electrode strip 300 with each roll, eliminating the empty foil area between adjacent electrodes 301 in the first direction, greatly reducing the empty foil area that needs to be cut later, solving the problem of material waste, and effectively improving production efficiency.

[0058] In practical applications, the circumference of the pressure roller body 100 can be designed based on factors such as the protrusion height of the protrusion 200 along the radial direction of the pressure roller body 100, the design length of the electrode 301 along the first direction, and the installation conditions of the roller pressing equipment where the pressure roller body 100 is located. No further limitations are imposed here.

[0059] In some embodiments of this application, the diameter of the pressure roller body 100 is The protrusion height of the protrusion 200 along the radial direction of the pressure roller body 100 is The pressure rollers meet the following requirements:

[0060] .

[0061] It is understandable that the protrusion 200 moves in a circle, while the electrode strip 300 moves in a straight line. If the angular velocity of the protrusion 200 is too large, it will cause the protrusion 200 to rotate too much when the electrode 301 is waiting for material, which will easily cause the gap formed by the rolling to deform and widen along the first direction, resulting in a deviation from the design.

[0062] This embodiment controls the diameter of the pressure roller body 100. and the protrusion height of the protrusion 200 Satisfying the above relationship allows the diameter of the pressure roller body 100 to be... The angular velocity of the protrusion 200 is controlled to be greater than a certain limit to avoid excessive angular velocity, thereby ensuring the quality of the roll forming.

[0063] Specifically, during the rolling operation, the axis of the pressure roller body 100 is generally kept fixed, and the pressure roller body 100 only rotates. When the pressure roller body 100 rolls the electrode strip 300, the distance between the axis of the pressure roller body 100 and the contact point is when the protrusion 200 just abuts the electrode strip 300. When the protrusion 200 is fully pressed into the electrode strip 300, the distance between the axis of the pressure roller body 100 and the contact point is... At this time, the electrode strip 300 is tangent to the pressure roller body 100.

[0064] During this process, the protrusion rotates 200 degrees at the following angle: The pressure roller will satisfy: .

[0065] by , and rotation angle By constructing a right triangle, the rotation angle can be obtained. The corresponding electrode strip 300 moving length along the first direction .

[0066] At the same time, it is also possible to obtain the rotation angle. The rotational arc length of the corresponding protrusion 200 for:

[0067] .

[0068] This embodiment controls So that the protrusion 200 can rotate at different angles. When the rotation arc length is close to the moving length of the electrode strip 300, the protrusion 200 is prevented from shifting too much relative to the electrode strip 300 in the first direction, which can effectively ensure the accuracy of the pores formed by the roll forming.

[0069] Understandably, the diameter of the pressure roller body The aforementioned relationship needs to be greater than a certain lower limit value to ensure that it holds true. Therefore, this embodiment designs the lower limit of the diameter of the pressure roller body 100 to ensure the quality of the roller pressing.

[0070] Reference Figure 2 In some embodiments of this application, the electrode strip 300 includes a plurality of coating areas distributed along a second direction, and the first direction intersects the second direction. It is understood that the first direction is the belt travel direction of the electrode strip 300 during rolling. The second direction intersects the first direction, meaning that the electrode strip 300 has a plurality of coating areas along its width direction, thereby enabling the separation of a plurality of electrodes 301 in the width direction.

[0071] Reference Figure 2Corresponding to the design of the electrode strip 300 described above, the outer circumferential surface of the pressure roller body 100 in this embodiment is provided with multiple sets of raised areas 101 along the axial direction, and each set of raised areas 101 is provided with a raised portion 200. Furthermore, along the axial direction of the pressure roller body 100, the width of a single raised area 101 is equal to the dimension of a single coating area along the second direction. Thus, each set of raised areas 101 distributed along the axial direction of the pressure roller body 100 corresponds to a coating area, enabling precise rolling of the coating area and fully meeting the rolling and perforation requirements of the electrode strip 300 having multiple coating areas in the second direction.

[0072] Obviously, in this embodiment, when the pressure roller body 100 rolls the electrode strip 300, it can simultaneously roll and punch multiple coating areas distributed along the second direction on the electrode strip 300, which can effectively improve production efficiency.

[0073] It should be noted that the raised area 101 can be a solid structure or a region with intuitive boundaries, or it can be a region where the raised parts 200 are concentrated. In this application, the concept of raised area 101 is mainly introduced to facilitate understanding of the distribution of the raised parts 200 and the correspondence with the electrode 301.

[0074] Continue to refer to Figure 2 In some embodiments of this application, along the second direction, the electrode strip 300 further includes a first empty foil area disposed between adjacent coating areas. Correspondingly, along the axial direction of the pressure roller body 100, adjacent sets of raised areas 101 are spaced apart by a first distance, and the first distance is equal to the dimension of the first empty foil area along the second direction.

[0075] By employing the structural configuration of this embodiment, and by spacing a first distance between two axially adjacent sets of raised areas 101, the raised portion 200 can precisely avoid the first empty foil area on the electrode strip 300, allowing only the coating area to be rolled and perforated. This ensures the alignment of the raised area 101 with the coating area, facilitating non-uniform perforation design. When three or more sets of raised areas 101 are provided, the first distance between two adjacent sets of raised areas 101 can be the same or different, and those skilled in the art can flexibly set it as needed.

[0076] Continue to refer to Figure 2 In some embodiments of this application, the electrode strip 300 further includes a second empty foil area disposed on the outermost side of the electrode strip 300 along a second direction. Correspondingly, along the axial direction of the pressure roller body 100, the outermost protrusion 101 is spaced apart from the end of the pressure roller body 100 by a second distance, and the second distance is equal to the dimension of the second empty foil area along the second direction.

[0077] It is understood that when the pressure roller body 100 is provided with two sets of raised areas 101 along the axial direction, that is, each set of raised areas 101 is spaced apart from the end of the pressure roller body 100 by a second distance; when the pressure roller body 100 is provided with three or more sets of raised areas 101 along the axial direction, that is, the two outermost sets of raised areas 101 along the axial direction are spaced apart from the end of the pressure roller body 100 by a second distance.

[0078] In this embodiment, a second distance is spaced between the outermost raised area 101 and the end of the pressure roller body 100 to ensure the alignment of the raised portion 200 with the coating area. The second distance between the raised areas 101 on both sides and the end of the pressure roller body 100 can be the same or different, and those skilled in the art can flexibly set it according to the design of the electrode strip 300.

[0079] In some embodiments of this application, the depth of the pores formed by the rolling of the electrode strip 300 is... The maximum diameter is The axial distance between adjacent pores along the first direction is The protrusion height of the protrusion 200 along the radial direction of the pressure roller body 100 is The maximum diameter of the protrusion 200 is The axial distance between adjacent protrusions 200 along the circumference of the pressure roller body 100 is L. The pressure roller in this embodiment satisfies:

[0080] ,in ;

[0081] ,in ;

[0082] ,in .

[0083] This embodiment allows setting the parameters of the protrusion 200 based on the actual required pore size parameters on the electrode 301, which helps ensure the processing quality of the rolled pores. Regarding... The specific settings can be selected by technicians based on experience, such as the belt speed of the electrode strip 300, the pressure of the pressure roller body 100 on the electrode strip 300, and the feeding angle of the protrusion 200 pressing the electrode strip 300.

[0084] In practical applications, you can also refer to only one or two of the above three relationships for application design.

[0085] Reference Figure 1 and Figure 2The embodiments of this application also propose a pressure roller for punching electrode strip 300, which can separate the electrode strip 300 to obtain multiple electrodes 301. The pressure roller of this embodiment includes:

[0086] The pressure roller body 100 has at least one set of raised areas 101 arranged along the axial direction. Each set of raised areas 101 includes a plurality of raised areas 101 continuously arranged along the circumference of the pressure roller body 100.

[0087] Multiple sets of protrusions 200 are connected to the outer peripheral surface of the pressure roller body 100. Each set of protrusions 200 is respectively provided corresponding to a protrusion area 101, and each set of protrusions 200 includes multiple protrusions 200.

[0088] Along the circumference of the pressure roller body 100, the length of a single protrusion 101 is equal to the dimension of a single electrode 301 along the first direction, and the multiple protrusions 200 within each protrusion 101 are not uniformly distributed.

[0089] It is understood that the pressure roller body 100 in this embodiment is continuously provided with multiple raised areas 101 along the circumference, and multiple raised parts 200 are non-uniformly distributed in each raised area 101, so as to achieve continuous non-uniform punching operation when the electrode strip 300 is pressed by roller.

[0090] Furthermore, when the pressure roller body 100 is provided with multiple sets of raised areas 101 along the axial direction, multiple positions on the electrode strip 300 can be synchronously rolled to perform continuous non-uniform punching operations.

[0091] In this embodiment, the pressure roller has non-uniformly distributed protrusions 200 in the circumferentially arranged protrusion area 101 of the pressure roller body 100. When the electrode strip 300 is rolled, continuous non-uniform punching can be achieved. Since the circumferentially arranged protrusion area 101 is continuously arranged, the empty foil area in the rolling direction is eliminated, which can solve the problems of low production efficiency and material waste.

[0092] In this embodiment, the non-uniform distribution of the multiple protrusions 200 within the protrusion area 101 includes, but is not limited to, inconsistent spacing between the protrusions 200, or the protrusions 200 being distributed only in a local area of ​​the protrusion area 101. For example, along the first direction, the spacing between the protrusions 200 gradually increases or decreases; or, for example, the protrusions 200 are only distributed in the central area of ​​the protrusion area 101. The specific non-uniform distribution of the protrusions 200 can be set according to the perforation design of the electrode 301.

[0093] In some embodiments of this application, the protrusion area 101 includes a first sub-region and a second sub-region. Both the first sub-region and the second sub-region are provided with protrusions 200, and the distribution density of the protrusions 200 in the first sub-region is different from the distribution density of the protrusions 200 in the second sub-region.

[0094] It is understood that in this embodiment, the raised area 101 is divided into two sub-regions, such as a left region and a right region, or a central region and an edge region. By setting the raised portions 200 in the two sub-regions to different distribution densities, different densities of pores are rolled into the two regions of the electrode sheet 301. The specific division of the first and second sub-regions is not specifically limited here.

[0095] In some embodiments of this application, the raised area 101 includes a first sub-region and a second sub-region. Both the first and second sub-regions are provided with raised portions 200, and the center-to-center distance between adjacent raised portions 200 in the first sub-region is different from the center-to-center distance between adjacent raised portions 200 in the second sub-region. Considering that the size and shape of the raised portions 200 may differ, this embodiment designs different center-to-center distances between adjacent raised portions 200, thus enabling non-uniform drilling even when the shape and size of the raised portions 200 differ.

[0096] In some embodiments of this application, the protrusion area 101 includes a first sub-region and a second sub-region, one of which is provided with a protrusion 200, while the other is not provided with a protrusion 200. Therefore, when the electrode strip 300 is rolled, the contact area between the protrusion 200 and the electrode strip 300 will be rolled to create a hole, while the contact area between the protrusion 200 and the electrode strip 300 will not be rolled to create a hole.

[0097] In some embodiments of this application, the raised area 101 sequentially includes a first sub-region, a second sub-region, and a third sub-region along the direction from the center outwards. Each of the first, second, and third sub-regions is provided with a protrusion 200. The distribution density of the protrusions 200 within the second sub-region is less than the distribution density within the first and third sub-regions.

[0098] With the structural configuration of this embodiment, the protrusions 200 on the first and third sub-regions can roll out pores with higher density in the central and edge regions of the electrode 301, while the protrusions 200 on the second sub-region can roll out pores with lower density in the transition region between the two, forming a pore design different from the aforementioned embodiment.

[0099] In some embodiments of this application, the electrode strip 300 has two coating areas along its width. The pressure roller body 100 has two sets of raised areas 101 along its axial direction. Each set of raised areas 101 has two raised areas 101 along its circumference. The circumferential length of each raised area 101 along the pressure roller body 100 is equal to the length of the electrode 301 designed on the electrode strip 300, and the circumference of the pressure roller body 100 is twice the length of the electrode 301. Figure 3 Each raised area 101 includes a first sub-region, a second sub-region, and a third sub-region in sequence from the center outwards. The first and third sub-regions are provided with multiple raised parts 200 with small spacing, and the second sub-region is provided with multiple raised parts 200 with large spacing. This rolls the electrode 301 to form a dense pore in the central and edge regions, while rolls the transition region between the central and edge regions to form a sparse pore.

[0100] It is understood that the pressure roller in this embodiment can press out two rows of electrode sheets 301 in the length direction of the electrode sheet strip 300 by pressing one revolution of the roller. Each row of electrode sheets 301 includes two electrode sheets 301.

[0101] In this application, the protrusion 200 provided on the pressure roller body 100 can adopt different structural designs according to the perforation design of the electrode sheet 301, such as setting the protrusion 200 as a conical structure, hemispherical structure, frustum structure, polygonal prism structure, irregular structure, etc.

[0102] Furthermore, to improve the quality of the pore forming during rolling, the protrusion 200 is tapered in a radial direction away from the axis of the roller body 100, so that its cross-section gradually decreases. This prevents the protrusion 200 from widening the pores formed during rolling along the belt direction of the electrode strip 300 when the electrode strip 300 is rolled by the protrusion 200, thus helping to improve the quality of the pore formation.

[0103] Embodiments of this application also provide an electrode 301 roller pressing device, which includes the pressing rollers of any of the above embodiments.

[0104] The electrode 301 rolling equipment of this embodiment, by applying the above-mentioned pressure roller, can continuously roll along the belt direction of the electrode material strip 300, eliminating the empty foil area between adjacent electrodes 301 in the belt direction, effectively improving production efficiency and solving the problem of material waste.

[0105] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A pressure roller for punching electrode strips, wherein the electrode strips can be separated to obtain multiple electrodes, characterized in that, The pressure roller includes a pressure roller body and a plurality of protrusions, the plurality of protrusions being connected to the outer peripheral surface of the pressure roller body and distributed along the circumferential direction of the pressure roller body; Wherein, the circumference of the pressure roller body is an integer multiple of the dimension of the electrode sheet along the first direction, and the integer is greater than or equal to 2.

2. The pressure roller according to claim 1, characterized in that, The diameter of the pressure roller body is The protrusion height of the protrusion along the radial direction of the pressure roller body is The pressure roller satisfies: 。 3. The pressure roller according to claim 1, characterized in that, The electrode strip includes multiple coating areas distributed along a second direction, the first direction intersects the second direction, and the outer peripheral surface of the pressure roller body is provided with multiple sets of raised areas along the axial direction, and each set of raised areas is provided with a raised portion. Wherein, along the axial direction of the pressure roller body, the width of a single raised area is equal to the dimension of a single coated area along the second direction.

4. The pressure roller according to claim 3, characterized in that, Along the second direction, the electrode strip further includes a first empty foil area disposed between adjacent coating areas; along the axial direction of the pressure roller body, two adjacent sets of raised areas are spaced apart by a first distance; Wherein, the first distance is equal to the dimension of the first empty foil area along the second direction.

5. The pressure roller according to claim 3, characterized in that, The electrode strip also includes a second empty foil area disposed on the outermost side of the electrode strip along the second direction; along the axial direction of the pressure roller body, the outermost protrusion area is spaced apart from the end of the pressure roller body by a second distance; The second distance is equal to the dimension of the second empty foil area along the second direction.

6. The pressure roller according to claim 1, characterized in that, The depth of the pores formed by the rolling of the electrode strip is The protrusion height of the protrusion along the radial direction of the pressure roller body is The pressure roller satisfies: ,in ; and / or, The maximum diameter of the pores formed by the roller pressing of the electrode strip is The maximum diameter of the protrusion is The pressure roller satisfies: ,in ; and / or, The center-to-center distance between adjacent pores formed by the rolling of the electrode strip along the first direction is: The axial distance between adjacent protrusions along the circumferential direction of the pressure roller body is L, and the pressure roller satisfies: ,in .

7. A pressure roller for punching electrode strips, the electrode strips being capable of being separated to obtain multiple electrodes, characterized in that, include: The pressure roller body has at least one set of raised areas along the axial direction, and each set of raised areas includes a plurality of raised areas continuously arranged along the circumference of the pressure roller body. Multiple sets of protrusions are connected to the outer peripheral surface of the pressure roller body, and each set of protrusions corresponds to a protrusion area. Each set of protrusions includes multiple protrusions. Wherein, along the circumference of the pressure roller body, the length of a single protrusion area is equal to the dimension of a single electrode sheet along the first direction, and the plurality of protrusions in each protrusion area are not uniformly distributed.

8. The pressure roller according to claim 7, characterized in that, The raised area includes a first sub-region and a second sub-region; The protrusions are provided in both the first sub-region and the second sub-region, and the distribution density of the protrusions in the first sub-region is different from the distribution density of the protrusions in the second sub-region. And / or, the protrusions are provided in both the first sub-region and the second sub-region, and the center distance between adjacent protrusions in the first sub-region is different from the center distance between adjacent protrusions in the second sub-region; And / or, one of the first sub-region and the second sub-region is provided with the protrusion, while the other is not provided with the protrusion.

9. The pressure roller according to claim 7, characterized in that, Along the direction from the center outwards, the raised area sequentially includes a first sub-region, a second sub-region, and a third sub-region. The distribution density of the raised portion in the second sub-region is less than the distribution density in the first sub-region and / or the third sub-region.

10. An electrode rolling mill, characterized in that, Includes the pressure roller as described in any one of claims 1 to 9.

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