Electrode preparation device

Abstract

The application provides an electrode preparation device and relates to the technical field of electrode preparation. The electrode preparation device comprises an operation platform and a rolling assembly. The operation platform has a bearing surface extending along a first direction and being flat, and the bearing surface is configured to carry electrode blanks to be rolled. The rolling assembly comprises a first rolling piece in the shape of a cylinder. The first rolling piece is arranged directly above the bearing surface, and the two ends of the first rolling piece are respectively connected to the operation platform in a sliding manner. The first rolling piece can rotate around its own axis. A first gap is formed between the outer peripheral wall adjacent to the bearing surface of the first rolling piece and the bearing surface. The first rolling piece is configured to reciprocally roll along the first direction relative to the bearing surface under the action of an external force, so as to continuously roll the electrode blanks on the bearing surface, and form electrode sheets with a thickness matching the first gap. This lays a foundation for the uniform and consistent thickness of the electrode sheets prepared subsequently, and further improves the uniformity, consistency and reliability of the electrode preparation device in preparing the electrode sheets.

Description

Technical Field

[0001] This application relates to the field of electrode preparation technology, and in particular to an electrode preparation apparatus. Background Technology

[0002] In the electrochemical performance testing of materials, a counter electrode and a working electrode are required. The working electrode is the site of the electrochemical reaction, while the counter electrode forms a current loop with the working electrode, assisting in the electrochemical reaction and thus enabling the performance testing of the working electrode. Therefore, the counter electrode is a crucial participant in the electrochemical performance testing stage of materials.

[0003] In related technologies, the electrode blanks used to prepare the counter electrode are relatively soft metals such as sodium blocks, potassium blocks, and lithium blocks. The counter electrode is a sheet-like electrode with a certain shape. In the process of preparing the counter electrode, the operator prepares the sheet-like electrode blank by pressing it into a sheet and cutting it into shape.

[0004] However, in related technologies, there is a technical problem of uneven electrode thickness caused by the artificial pressing process. Summary of the Invention

[0005] This application provides an electrode preparation apparatus, which aims to solve the technical problem of uneven electrode thickness caused by the artificial pressing process, thereby improving the thickness uniformity of the electrode and thus improving the electrochemical stability and structural stability of the electrode.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] This application provides an electrode fabrication apparatus, including:

[0008] The operating platform has a flat bearing surface extending along a first direction, the bearing surface being configured to bear the electrode blank to be rolled.

[0009] The rolling assembly includes a cylindrical first rolling element, which is disposed directly above the bearing surface. Both ends of the first rolling element are slidably connected to the operating platform. The first rolling element is rotatable around its own axis, and a first gap is formed between the outer peripheral wall of the first rolling element adjacent to the bearing surface and the bearing surface.

[0010] The first rolling element is configured to reciprocate relative to the bearing surface along the first direction under the action of an external force, so as to continuously roll the electrode blank on the bearing surface to form an electrode sheet with a thickness adapted to the first gap.

[0011] In some embodiments, the rolling assembly further includes a cylindrical second rolling member disposed directly above the bearing surface. Along the circumference of the second rolling member, the outer peripheral wall of the second rolling member has a plurality of spaced-apart cut-hole groups. The second rolling member is rotatable about its own axis and is configured to roll relative to the bearing surface under the action of an external force, so that the electrode sheet is cut through the plurality of cut-hole groups to form an electrode sheet.

[0012] In some embodiments, along the axial direction of the second rolling member, both ends of the second rolling member are slidably connected to the operating platform, and the second rolling member rolls relative to the bearing surface in the first direction under the action of external force.

[0013] In some embodiments, the electrode preparation apparatus further includes a drive mechanism configured to drive at least one of the operating platform and the rolling assembly to move vertically up and down to adjust the size of the first gap vertically.

[0014] In some embodiments, the electrode preparation apparatus further includes two guide members, which are respectively disposed on both sides of the operating platform along the first direction; and each guide member has a first guide structure extending along the first direction on the side facing the rolling assembly, and the outer peripheral walls of the first rolling member and the second rolling member along their own axial ends each have a second guide structure extending along their circumference, and the first rolling member and the second rolling member are both rolledly connected to the corresponding guide member through the second guide structure and the first guide structure;

[0015] The drive mechanism is configured to drive the two guide members to move vertically up and down.

[0016] In some embodiments, the first guide structure is a guide groove, and the second guide structure is an annular protrusion that matches the guide groove.

[0017] In some embodiments, each of the guide grooves has a slot extending along the first direction on the side wall away from the operating platform. The first rolling member and the second rolling member have cylindrical protrusions coaxially arranged on their respective end faces along their own axial direction. The cylindrical protrusions are disposed in the corresponding slots, and the outer peripheral wall of the cylindrical protrusions is in rolling connection with the groove wall of the slot.

[0018] In some embodiments, the driving mechanism includes two driving units, each of which is respectively configured to correspond one-to-one with two guide members. Each driving unit includes a drive motor and a lead screw. The lead screw is disposed below the corresponding guide member and extends vertically. The lead screw is connected to the drive motor. The guide member has a lead screw nut that matches the lead screw, and the lead screw nut is helically connected to the lead screw.

[0019] In some embodiments, each of the cut hole groups includes a plurality of cut holes spaced apart along the axial direction of the second rolling element, and the cut holes in two adjacent cut hole groups are staggered.

[0020] In some embodiments, the second rolling element has a groove extending radially from its outer peripheral wall toward its axial direction, the groove forming the cut hole.

[0021] The electrode preparation apparatus provided in this application includes an operating platform and a rolling assembly. The operating platform has a bearing surface, and the rolling assembly includes a first rolling element. By leaving a first gap between the first rolling element and the bearing surface, the first rolling element can be rolled relative to the bearing surface to form an electrode sheet with a thickness consistent with the thickness of the first gap during rolling. This results in a uniform and consistent thickness of the electrode sheet, laying the foundation for uniform and consistent thickness of the subsequently prepared electrode plates. Compared to manual rolling, this method improves the reliability of the uniform thickness of the electrode sheet prepared by the electrode preparation apparatus, thereby improving the electrochemical and structural stability of the electrode plates prepared by the apparatus. Furthermore, by controlling the vertical size of the first gap, different requirements for the thickness of the electrode sheet can be met, facilitating the subsequent preparation of electrode plates of different thicknesses and improving the applicability of the electrode preparation apparatus.

[0022] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the electrode preparation apparatus provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1This is a schematic diagram of the electrode preparation apparatus provided in an embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the structure of a second rolling element provided in an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of a guide component provided in an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100 - Electrode preparation apparatus;

[0029] 110 - Operating platform; 111 - Bearing surface;

[0030] 120 - Rolling component; 121 - First rolling component; 122 - Second rolling component; 123 - Cutting assembly;

[0031] 1211 - Second guide structure; 1212 - Grip part; 1231 - Cut hole;

[0032] 130 - Guide component; 131 - First guide structure;

[0033] 140 - Lead screw nut. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] During battery electrode performance testing, a counter electrode and a working electrode are prepared. The working electrode is the site of the electrochemical reaction, while the counter electrode forms a current loop with the working electrode to assist in the electrochemical reaction, thereby testing the performance of the working electrode. Therefore, the counter electrode is a crucial participant in the battery electrode performance testing stage.

[0036] For example, the counter electrode includes, but is not limited to, sodium electrodes, lithium electrodes, potassium electrodes, etc.

[0037] In some embodiments, to manufacture the electrode sheet used for the aforementioned counter electrode, a sheet-like electrode sheet is formed from a block electrode blank, such as a sodium block, potassium block, or lithium block, by manually pressing the electrode blank into a sheet and cutting it into shape. However, in this process, there is a technical problem of uneven electrode sheet thickness caused by manual pressing.

[0038] To address the aforementioned technical problems, this application provides an electrode preparation apparatus. By leaving a first gap between a first rolling element and a supporting surface in the apparatus, the first rolling element can roll a block electrode blank into an electrode sheet with a thickness consistent with the thickness of the first gap during relative rolling. This results in a uniform and consistent thickness of the electrode sheet, laying the foundation for uniform and consistent thickness of the subsequently prepared electrode plates. Compared to manual rolling, this method improves the reliability of the electrode sheet thickness uniformity produced by the apparatus. Furthermore, by controlling the vertical size of the first gap, different requirements for electrode sheet thickness can be met, facilitating the subsequent preparation of electrode plates of varying thicknesses and improving the applicability of the electrode preparation apparatus.

[0039] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0040] Combination Figure 1 and Figure 2 As shown, the electrode preparation apparatus 100 includes an operating platform 110 and a rolling assembly 120.

[0041] Among them, such as Figure 1 As shown, the operating platform 110 has a flat bearing surface 111 extending along a first direction, which is configured to bear the electrode blank to be rolled.

[0042] For example, the bearing surface 111 is one of a polytetrafluoroethylene bearing surface, a 316L stainless steel bearing surface, and a ceramic bearing surface to avoid a chemical reaction between the bearing surface 111 and the electrode blank. The operating platform 110 has a length of 300 mm along the first direction, a width of 200 mm along the second direction, and a height of 50 mm along the vertical direction.

[0043] Combination Figure 1 and Figure 2 As shown, the rolling assembly 120 includes a first rolling element 121 in the shape of a cylinder.

[0044] The first rolling element 121 is disposed directly above the bearing surface 111, and both ends of the first rolling element 121 are slidably connected to the operating platform 110. The first rolling element 121 can rotate around its own axis, and a first gap is formed between the outer peripheral wall of the first rolling element 121 adjacent to the bearing surface 111 and the bearing surface 111. The first rolling element 121 is configured to roll back and forth relative to the bearing surface 111 in a first direction under the action of external force, so as to continuously roll the electrode blank on the bearing surface 111 to form an electrode sheet with a thickness that matches the first gap.

[0045] For example, the vertical height of the first gap ranges from 0.5mm to 3mm, such as 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0046] It should be noted that, as Figure 1 As shown, the first direction is the extension direction of the bearing surface 111, and the second direction is the axial direction of the first rolling element 121. The first direction is perpendicular to the second direction.

[0047] Therefore, in this embodiment, by leaving a first gap between the first rolling element 121 and the bearing surface 111, the block electrode blank can be rolled into an electrode sheet with a thickness consistent with the height of the first gap during the relative rolling process of the first rolling element 121 and the bearing surface 111. This results in a uniform and consistent thickness of the electrode sheet, laying the foundation for the uniform and consistent thickness of the subsequently prepared electrode sheets. Compared with direct manual rolling, this improves the reliability of the uniform thickness of the electrode sheet prepared by the electrode preparation device 100, thereby improving the electrochemical stability and structural stability of the electrode sheets prepared by the electrode preparation device. In addition, by controlling the size of the first gap along the vertical direction, different requirements for the thickness of the electrode sheet can be met, facilitating the subsequent preparation of electrode sheets of different thicknesses and improving the applicability of the electrode preparation device 100.

[0048] This involves further shaping the electrode sheet into an electrode plate of the desired shape, such as... Figure 1As shown, the rolling assembly 120 also includes a cylindrical second rolling element 122, which is disposed directly above the bearing surface 111. Along the circumference of the second rolling element 122, its outer peripheral wall has a plurality of spaced-apart cutting holes 123. The second rolling element 122 is rotatable around its own axis and is configured to roll relative to the bearing surface 111 under external force, so that the electrode sheet is cut into electrode sheets by the plurality of cutting holes 123. In this way, the electrode sheet can be rolled into an electrode sheet of a certain shape by the rolling action of the second rolling element 122. Furthermore, because the outer peripheral wall of the second rolling element 122 has a plurality of cutting holes 123, the electrode sheets can be mass-produced as the second rolling element 122 rolls relative to the bearing surface 111, thereby improving the efficiency of the electrode preparation apparatus 100 in preparing electrode sheets and reducing time costs.

[0049] It should be noted that electrode blanks, such as sodium, potassium, and lithium blocks, have relatively low hardness and are classified as soft metals. Specifically, sodium has a Mohs hardness of approximately 0.4, potassium approximately 0.4, and lithium approximately 0.6. Therefore, the rolling and pressing of electrode blanks and the cutting of electrode sheets involve relatively low resistance. Combined with the electrode preparation apparatus 100, this improves the speed and efficiency of electrode preparation. For example, the efficiency of electrode preparation using the electrode preparation apparatus 100 of this application is increased by more than 30%.

[0050] For example, such as Figure 1 As shown, each hole group 123 includes a plurality of holes 1231 arranged at intervals along the axial direction of the second rolling member 122, and the holes 1231 in two adjacent hole groups 123 are staggered. This arrangement increases the number of holes 1231 on the outer peripheral wall of the second rolling member 122, thereby further improving the efficiency of electrode preparation device 100 in preparing electrode sheets and reducing time costs.

[0051] In some specific embodiments, the second rolling element 122 has a groove extending radially from its outer peripheral wall toward its axial direction, forming a cut hole 1231. During the rolling process of the second rolling element 122 relative to the bearing surface 111, the groove opening cuts the electrode sheet into an electrode sheet with the same shape as the groove opening by rolling.

[0052] Therefore, the shape and size of each cut hole 1231 on the second rolling element 122 can be set according to the required shape and size of the electrode sheet. For example, the shape of each cut hole 1231 is circular, and the diameter of the circle ranges from 12 to 20 mm. Specifically, the cut holes 1231 are circles with diameters of 12 mm, 15 mm, 18 mm, 20 mm, etc. Of course, each cut hole 1231 can also be elliptical, square, polygonal, etc., to meet the needs of electrode sheets of different shapes and sizes.

[0053] In other embodiments, the second rolling element 122 can also be obtained by fixing a sleeve with a cut hole 1231 to the outer peripheral wall of the first rolling element 121.

[0054] In addition, such as Figure 1 As shown, along the axial direction of the second rolling element 122, both ends of the second rolling element 122 are slidably connected to the operating platform 110, and the second rolling element 122 rolls relative to the bearing surface 111 in a first direction under the action of external force. In this way, while enhancing the reliability of the movement between the second rolling element 122 and the operating platform 110, the consistency and uniformity of the movement of the second rolling element 122 in one direction are improved, thereby improving the integrity and cutting reliability of the electrode sheet formed during the cutting process of the electrode sheet by the cutting hole 1231 on the second rolling element 122.

[0055] In some embodiments, the electrode preparation apparatus 100 further includes a driving mechanism configured to drive at least one of the operating platform 110 and the rolling assembly 120 to move vertically up and down to adjust the size of the first gap in the vertical direction. The driving mechanism improves the accuracy of setting the vertical dimension of the first gap, thereby improving the accuracy of the electrode thickness prepared by the electrode preparation apparatus 100 and enhancing the reliability of the electrode preparation process.

[0056] Combination Figure 1 and Figure 3 As shown, the electrode preparation apparatus also includes two guide members 130, which are respectively disposed on both sides of the operating platform 110 along the first direction. Each guide member 130 has a first guide structure 131 extending along the first direction on the side facing the rolling assembly 120. The outer peripheral walls of the first rolling member 121 and the second rolling member 122 along their own axial ends each have a second guide structure 1211 extending circumferentially. The first rolling member 121 and the second rolling member 122 are both rolledly connected to the corresponding guide member 130 through the second guide structure 1211 and the first guide structure 131. This improves the guidance, stability, and consistency of the movement of the first rolling member 121 and the second rolling member 122 along the first direction.

[0057] For example, the first guide structure 131 is a guide groove, and the second guide structure 1211 is an annular protrusion that matches the guide groove. The matching arrangement of the guide groove and the annular protrusion is simple in structure and easy to implement.

[0058] Specifically, the dimensions of the guide groove along the second direction range from 1.5mm to 10mm. For example, the dimensions of the guide groove along the second direction are 1.5mm, 3mm, 5mm, 8mm, 10mm, etc.

[0059] Furthermore, the drive mechanism is configured to drive two guide members 130 to rise and fall vertically, thereby causing the two guide members 130 to drive the first rolling member 121 or the second rolling member 122 to rise or fall vertically relative to the bearing surface 111. This satisfies the vertical dimensional requirements of the first gap and the requirement that the second rolling member 122 rolls in contact with the bearing surface 111, and that the cutting hole 1231 on the second rolling member 122 completely cuts out the electrode sheet from the electrode sheet.

[0060] In some specific embodiments, the drive mechanism includes two drive units, each corresponding to one of the two guide members 130. Each drive unit includes a drive motor and a lead screw. The lead screw is located below the corresponding guide member 130 and extends vertically. The lead screw is connected to the drive motor. Figure 3 As shown, the guide member 130 has a lead screw nut 140 that matches the lead screw, and the lead screw nut 140 is helically connected to the lead screw. In this way, two guide members 130 can be driven by two drive units respectively to drive the first rolling piece 121 or the second rolling piece 122 to rise and fall vertically at both ends along the second direction. By adjusting the two drive units respectively, the relative positional relationship between the first rolling piece 121 and the second rolling piece 122 and the bearing surface 111 can be adjusted, so that the height of the first rolling piece 121 and the second rolling piece 122 relative to the bearing surface 111 is consistent in the second direction. This avoids the situation where the two guide members 130 are inconsistent in vertical height under the same drive unit, which would lead to an inability to adjust.

[0061] In addition, each guide groove has a slot extending in the first direction on its side wall away from the operating platform 110. The first rolling element 121 and the second rolling element 122 each have a cylindrical protrusion coaxially arranged with the first rolling element 121 and the second rolling element 122 on their respective end faces along their axial direction. The cylindrical protrusions are disposed within the corresponding slots, and their outer peripheral walls are in rolling contact with the slot walls. In this way, during the rolling process of the slots and the corresponding cylindrical protrusions, the vertical movement of the first rolling element 121 and the second rolling element 122 relative to the bearing surface 111 is restricted. This further improves the stability of the movement of the first rolling element 121 and the second rolling element 122 relative to the bearing surface 111, while also further improving the vertical positional accuracy of the first rolling element 121 and the second rolling element 122 relative to the bearing surface 111.

[0062] For example, such as Figure 1 and Figure 2As shown, both the first rolling element 121 and the second rolling element 122 have gripping portions 1212 on their axial ends. The operator can use the gripping portions 1212 at both ends of the first rolling element 121 or the second rolling element 122 to push the first rolling element 121 or the second rolling element 122 to roll relative to the bearing surface 111. Specifically, the gripping portion 1212 is a cylindrical member extending away from the first rolling element 121 and the second rolling element 122. To facilitate gripping, annular protrusions or annular recesses extending circumferentially can also be provided on the outer peripheral wall of the cylindrical member to increase the operating friction between the gripping portion 1212 and the operator's palm. In this case, each cylindrical member becomes a cylindrical protrusion, which rolls with the corresponding slot near the root of the corresponding first rolling element 121 or second rolling element 122.

[0063] In some embodiments, the electrode preparation apparatus 100 further includes a transparent housing with a receiving space for accommodating the operating platform 110, the rolling assembly 120, the drive mechanism, and two guide members 130. The transparent housing has openings on its side surfaces along a first direction, and operating gloves are provided at these openings. The put-on and take-off ends of the operating gloves are sealed to the edges of the openings. For example, the operating gloves are rubber gloves, allowing the operator's hands to be inserted through the put-on and take-off ends and then into the receiving space through the openings to facilitate the operation of the first rolling member 121 and the second rolling member 122.

[0064] The transparent enclosure is filled with an inert gas, such as argon or nitrogen, to ensure that the water and oxygen content within the enclosure is less than 0.1 ppm. This prevents oxidation of the electrode blank, electrode sheet, and electrode during electrode fabrication, reduces material loss, and improves material utilization. For example, the material loss rate is less than 5%.

[0065] In summary, taking the preparation of sodium electrodes as an example, the process of preparing electrodes using electrode preparation apparatus 100 is as follows:

[0066] 1) Obtaining electrode blanks; Specifically, the operator puts on operating gloves to enter the storage space, takes out sodium blocks from the kerosene tank, wipes the outer wall of the sodium blocks clean with a lint-free cloth, and then uses a ceramic knife to cut the sodium blocks into electrode blanks of the required size.

[0067] 2) Place the electrode material on the bearing surface 111;

[0068] 3) The two guide members 130 are driven by the drive mechanism to move the first rolling member 121 vertically up and down, so as to set the size of the first gap vertically to a preset value;

[0069] 4) The operator pushes the first rolling piece 121 to roll back and forth along the first direction relative to the bearing surface 111, so as to continuously roll the electrode blank into an electrode sheet that matches the first gap.

[0070] In addition, the process of preparing the electrode sheet using the electrode preparation apparatus 100 also includes the following steps:

[0071] 5) The operator pushes the second rolling piece 122 to roll relative to the bearing surface 111 in the first direction so that the cutting hole 1231 provided on the outer peripheral wall of the second rolling piece 122 cuts the electrode sheet to obtain the electrode sheet.

[0072] In some embodiments, the electrode preparation process further includes:

[0073] 6) Polish the electrode to remove the protective layer on the surface of the electrode;

[0074] 7) Use clamping devices to hold the electrode in the desired position; for example, use tweezers to hold the electrode and form a coin cell with the working electrode to perform performance testing on the working electrode.

[0075] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments" used in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not all embodiments necessarily include that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0076] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "one" can be understood to convey either singular or plural usage.

[0077] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0078] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An electrode preparation apparatus, characterized in that, include: The operating platform (110) has a flat bearing surface (111) extending along a first direction, the bearing surface (111) being configured to bear the electrode blank to be rolled; The rolling assembly (120) includes a cylindrical first rolling element (121), which is disposed directly above the bearing surface (111). Both ends of the first rolling element (121) are slidably connected to the operating platform (110). The first rolling element (121) is rotatable around its own axis. A first gap is formed between the outer peripheral wall of the first rolling element (121) adjacent to the bearing surface (111) and the bearing surface (111). The first rolling element (121) is configured to reciprocate relative to the bearing surface (111) in the first direction under the action of an external force, so as to continuously roll the electrode blank on the bearing surface (111) to form an electrode sheet with a thickness adapted to the first gap.

2. The electrode preparation apparatus according to claim 1, characterized in that, The rolling assembly (120) further includes a cylindrical second rolling element (122), which is disposed directly above the bearing surface (111). Along the circumference of the second rolling element (122), the outer peripheral wall of the second rolling element (122) has a plurality of spaced-apart cut hole groups (123). The second rolling element (122) is rotatable about its own axis and is configured to roll relative to the bearing surface (111) under the action of external force so that the electrode sheet is cut by the plurality of cut hole groups (123) to form an electrode sheet.

3. The electrode preparation apparatus according to claim 2, characterized in that, Along the axial direction of the second rolling piece (122), both ends of the second rolling piece (122) are slidably connected to the operating platform (110), and the second rolling piece (122) rolls relative to the bearing surface (111) in the first direction under the action of external force.

4. The electrode preparation apparatus according to claim 2 or 3, characterized in that, The electrode preparation apparatus (100) further includes a drive mechanism configured to drive at least one of the operating platform (110) and the rolling assembly (120) to move vertically up and down to adjust the size of the first gap in the vertical direction.

5. The electrode preparation apparatus according to claim 4, characterized in that, The electrode preparation device further includes two guide members (130). Along the first direction, the two guide members (130) are respectively disposed on both sides of the operating platform (110). Each guide member (130) has a first guide structure (131) extending along the first direction on the side facing the rolling assembly (120). The first rolling member (121) and the second rolling member (122) each have a second guide structure (1211) extending along their circumferential direction on the outer peripheral walls at both ends along their own axial direction. The first rolling member (121) and the second rolling member (122) are both rolledly connected to the corresponding guide member (130) through the second guide structure (1211) and the first guide structure (131). The drive mechanism is configured to drive the two guide members (130) to move vertically up and down.

6. The electrode preparation apparatus according to claim 5, characterized in that, The first guide structure (131) is a guide groove, and the second guide structure (1211) is an annular protrusion that matches the guide groove.

7. The electrode preparation apparatus according to claim 6, characterized in that, Each of the guide grooves has a slot extending along the first direction on the side wall away from the operating platform (110). The first rolling member (121) and the second rolling member (122) have cylindrical protrusions coaxially arranged on their end faces along their own axial direction. The cylindrical protrusions are disposed in the corresponding slots, and the outer peripheral wall of the cylindrical protrusions is in rolling connection with the groove wall of the slot.

8. The electrode preparation apparatus according to claim 5, characterized in that, The driving mechanism includes two driving units, each corresponding to one of the two guide members (130). Each driving unit includes a drive motor and a lead screw. The lead screw is located below the corresponding guide member (130) and extends vertically. The lead screw is connected to the drive motor. The guide member (130) has a lead screw nut (140) that matches the lead screw. The lead screw nut (140) is helically connected to the lead screw.

9. The electrode preparation apparatus according to claim 2, characterized in that, Each of the cutting hole groups (123) includes a plurality of cutting holes (1231) spaced apart along the axial direction of the second rolling element (122), and the cutting holes (1231) in two adjacent cutting hole groups (123) are staggered.

10. The electrode preparation apparatus according to claim 9, characterized in that, The second rolling element (122) has a groove extending radially from its outer peripheral wall toward its axial direction, the groove forming the cut hole (1231).

Images