Micro-needle roller, pole piece punching device, pole piece forming equipment and pole piece forming process

Abstract

The invention discloses a micro-needle roller, a pole piece punching device, pole piece forming equipment and a pole piece forming process. The micro-needle roller comprises a mandrel and a plurality of needle roller units; the plurality of needle roller units are coaxially sleeved on the mandrel; and micro-needles are convexly arranged on the peripheral surfaces of the needle roller units so as to process blind holes in the pole pieces. According to the microneedle roller, when the microneedles on the microneedle roller are damaged, only the needle roller unit where the damaged microneedles are located needs to be positioned and replaced, the whole microneedle roller does not need to be replaced, and the equipment cost is reduced; by replacing the needle roller units with different specifications on the core shaft or increasing or reducing the number of the needle roller units, the micro needle roller suitable for pole pieces with different widths or different punching area requirements can be combined on the same core shaft, so that an integral and expensive micro needle roller does not need to be customized for each new product; the application range of the micro-needle roller is widened, and the cost of the micro-needle roller is further reduced.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to microneedle rollers, electrode punching devices, electrode forming equipment, and electrode forming processes. Background Technology

[0002] Electrode drilling devices typically use a hole-forming component to apply pressure to the electrode surface to create blind holes. This method can effectively improve the energy density and charge / discharge performance of the battery.

[0003] In related technologies, during the drilling process, the hole-forming component is easily damaged due to the continuous reaction force from the electrode sheet. However, since the hole-forming component is a one-piece structure, even if only a part of it is damaged, the entire component needs to be replaced, resulting in high maintenance costs. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a microneedle roller, which is configured as multiple coaxial, independent needle roller units, allowing for targeted replacement when some microneedle units are damaged, thus achieving localized maintenance and effectively reducing the cost of use and maintenance.

[0005] The present invention also proposes an electrode drilling device.

[0006] The present invention also proposes an electrode forming device.

[0007] This invention also proposes an electrode forming process.

[0008] The first aspect of the present invention provides a micro needle roller, which includes a mandrel and a plurality of needle roller units: the plurality of needle roller units are coaxially sleeved on the mandrel, and micro needles are protruding on the outer peripheral surface of the needle roller units to process blind holes on the electrode sheet.

[0009] In some embodiments, the micro needle roller further includes two stop members respectively disposed at both ends of the mandrel, and the plurality of needle roller units are disposed between the two stop members; the two stop members are capable of moving towards each other and away from each other on the mandrel; when the two stop members move towards each other, they respectively abut against two needle roller units located at both ends of the axial direction of the mandrel among the plurality of needle roller units, thereby pressing and fixing the plurality of needle roller units.

[0010] In some embodiments, an axial spacing retainer is provided between two adjacent needle roller units.

[0011] In some embodiments, the microneedle array is distributed on the outer peripheral surface of the needle roller unit.

[0012] In some embodiments, the microneedle is constructed as a frustum; the diameter of the frustum gradually decreases along the radial direction of the needle roller unit and away from the side of the needle roller unit.

[0013] A second aspect of the present invention provides an electrode punching device, which includes a base, a support roller, a roller gap adjustment mechanism, and a microneedle roller as described in the first aspect of the present invention; the support roller is rotatably mounted on the base; the microneedle roller is rotatably mounted on the base; the support roller and the microneedle roller are arranged opposite to each other and define a roller gap; the roller gap adjustment mechanism adjusts the size of the roller gap by driving the microneedle roller and the support roller to move towards or away from each other; wherein the microneedles on the microneedle roller are configured to process blind holes on the electrode when the electrode passes through the roller gap.

[0014] In some embodiments, the two ends of the microneedle roller are slidably disposed on the base via microneedle roller bearing seats; the roller gap adjustment mechanism includes a drive member and a wedge structure; the wedge structure is disposed on the base, and the inclined surface of the wedge structure abuts against the microneedle roller bearing seat; the drive member is used to drive the microneedle roller bearing seat to move along the inclined surface of the wedge structure, thereby causing the microneedle roller bearing seat to move the microneedle roller closer to or away from the support roller.

[0015] In some embodiments, the electrode punching device further includes a debris cleaning component; the debris cleaning component is disposed on the side of the micro needle roller that is different from the support roller and is used to clean debris on the outer peripheral surface of the needle roller unit.

[0016] In some embodiments, the electrode punching device includes a first electrode punching device, a second electrode punching device, and an electrode buffer mechanism. The first electrode punching device and the second electrode punching device are spaced apart on the electrode transport path and are respectively used to process blind holes on different surfaces of the electrode. The electrode buffer mechanism is used to compensate for the difference in electrode transport speed between the first electrode punching device and the second electrode punching device.

[0017] A third aspect of the present invention provides an electrode forming apparatus, which includes an electrode driving device and an electrode drilling device as described in the second aspect of the present invention. The electrode driving device is used to drive the electrode to move along the electrode conveying path; the rolling assembly is used to roll the electrode; and the electrode drilling device is located downstream of the rolling assembly and is used to process blind holes on the electrode.

[0018] A fourth aspect of the present invention provides an electrode forming process, applied to the electrode forming equipment described in the third aspect of the present invention, comprising the following steps:

[0019] Step S1: Drive the electrode along the electrode conveying path using the electrode driving device;

[0020] Step S2: Roll the electrode sheet using the rolling assembly;

[0021] Step S3: Blind holes are machined on the rolled electrode using the electrode punching device.

[0022] As can be seen from the technical solution, the embodiments provided by the present invention have the following advantages:

[0023] (1) The microneedle roller can be used in conjunction with the support member. The support member supports one side of the electrode sheet, and the microneedle roller presses on the other side of the electrode sheet. The microneedles protruding from the outer circumferential surface of the microneedle roller process blind holes on the electrode sheet, thereby improving the energy density and charge / discharge performance of the battery.

[0024] (2) When the microneedles on the microneedle roller are damaged, only the needle roller unit where the damaged microneedle is located needs to be located and replaced, without replacing the entire microneedle roller, thus reducing equipment costs;

[0025] (3) By replacing needle roller units of different specifications (such as different lengths and different micro needle arrangement patterns) on the mandrel, or by increasing or decreasing the number of needle roller units, micro needle rollers suitable for different widths of electrode sheets or different perforation areas can be combined on the same mandrel. This eliminates the need to customize an integral and expensive micro needle roller for each new product, expands the application range of micro needle rollers, and further reduces the cost of micro needle rollers. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a cross-sectional view of a microneedle roller according to an embodiment of the present invention;

[0028] Figure 2 This is a partially enlarged view of the microneedle roller according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the electrode punching device according to an embodiment of the present invention;

[0030] Figure 4 It is based on Figure 3 Enlarged view at point A;

[0031] Figures 5-6 This is a schematic diagram of the electrode punching device according to an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of an electrode forming device according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] Electrode forming equipment 1000, electrode 2000;

[0035] Electrode punching device 100, first electrode punching device 101, second electrode punching device 102, electrode driving assembly 200, unwinding device 201, winding device 202, and roller pressing assembly 300;

[0036] Microneedle roller 1, mandrel 10, needle roller unit 11, microneedle 12, stop 13, axial spacing retainer 14, microneedle roller bearing seat 15, backing bearing 16, linear guide pair 17.

[0037] Base 2;

[0038] Support roller 3, support roller body 30, support roller bearing seat 31, support roller rotation power component 32;

[0039] Roll gap adjustment mechanism 4, drive component 41, wedge structure 42, inclined block 421, inclined surface 4211, mounting bracket 422, lead screw 423, dial indicator 43;

[0040] Debris removal assembly 5, air knife assembly 51, negative pressure collection device 52;

[0041] Electrode buffer mechanism 6, buffer roller 61, tension roller 62;

[0042] Rack 7;

[0043] Scraper assembly 8;

[0044] Roller assembly 9. Detailed Implementation

[0045] Embodiments of the present invention 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 the present invention, and should not be construed as limiting the present invention.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0047] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] Traditional lithium-ion batteries, sodium-ion batteries, and supercapacitors feature smooth, planar surfaces on their electrodes or current collectors, typically with thicknesses in the micrometer range. These strips represent traditional two-dimensional structures. While this type of structure remains the mainstream, its technological bottlenecks are becoming increasingly apparent. Issues such as limited energy density, poor tolerance to volume expansion, and difficulties in improving cycle life are hindering the industry's development.

[0049] To improve the energy density and charge / discharge performance of batteries, increasing the specific surface area of ​​the current collector and electrode surfaces to provide larger channels for electrons is a feasible technical approach. Therefore, the surfaces of the electrode and current collector can be three-dimensionally modified to achieve the goal of increasing energy density and charge / discharge performance.

[0050] Currently, three-dimensional processing of traditional electrodes or current collectors can increase their surface area, optimize interfacial bonding, and improve electrical performance. Therefore, developing a surface modification processing device for the microscopic level of battery and capacitor electrodes and current collectors is of profound significance.

[0051] In related technologies, electrode drilling devices typically use a hole-forming component to apply pressure to the electrode surface to create blind holes. This method can effectively improve the energy density and charge / discharge performance of the battery.

[0052] During the drilling process, the hole-forming component is constantly subjected to the reaction force of the electrode sheet, making it highly susceptible to damage. However, since the hole-forming component is a one-piece structure, even partial damage requires the entire component to be replaced, resulting in high maintenance costs.

[0053] The following is for reference. Figures 1-7 The microneedle roller 1, electrode punching device 100, electrode forming equipment 1000, and electrode 2000 forming process according to embodiments of the present invention are described.

[0054] Example 1

[0055] like Figure 1 and Figure 2 As shown, a first aspect embodiment of the present invention provides a micro needle roller 1, which includes a mandrel 10 and a plurality of needle roller units 11. Each needle roller unit 11 is sleeved on the mandrel 10, and the plurality of needle roller units 11 are arranged along the axial direction of the mandrel 10. Each needle roller unit 11 has a protruding micro needle 12 on its outer peripheral surface, and the micro needle 12 can be used to process blind holes on the electrode sheet 2000.

[0056] In a specific application scenario, the microneedle roller 1 can be used in conjunction with a support member. The support member supports one side of the electrode 2000, and the microneedle roller 1 presses against the other side of the electrode 2000. Microneedles 12 protruding from the outer circumference of the microneedle roller 1 process blind holes in the electrode 2000, thereby improving the battery's energy density and charge / discharge performance. When a microneedle 12 on the microneedle roller 1 is damaged, the damaged needle roller unit 11 is located and removed from the spindle 10. A new needle roller unit 11 is then installed on the spindle 10, eliminating the need to replace the entire microneedle roller 1, thus reducing equipment costs.

[0057] It should also be emphasized that by replacing the needle roller units 11 of different specifications (such as different lengths and different micro needle 12 arrangement patterns) on the mandrel 10, or by increasing or decreasing the number of needle roller units 11, micro needle rollers 1 suitable for different widths of electrode sheets 2000 or different perforation area requirements can be combined on the same mandrel 10. Thus, it is not necessary to customize an integral and expensive micro needle roller 1 for each new product.

[0058] As can be seen from the technical solution, the embodiments provided by the present invention have the following advantages:

[0059] (1) The micro needle roller 1 can be used in conjunction with the support member. The support member is supported on one side surface of the electrode 2000, and the micro needle roller 1 is pressed on the other side surface of the electrode 2000. The micro needles 12 protruding on the outer peripheral surface of the micro needle roller 1 are used to process blind holes on the electrode 2000, thereby improving the energy density and charge / discharge performance of the battery.

[0060] (2) When the micro needles 12 on the micro needle roller 1 are damaged, only the needle roller unit 11 where the damaged micro needle 12 is located needs to be located and replaced, without replacing the entire micro needle roller 1, which reduces equipment costs;

[0061] (3) By replacing the needle roller unit 11 with different specifications (such as different lengths and different micro needle 12 arrangement patterns) on the mandrel 10, or by increasing or decreasing the number of needle roller units 11, micro needle roller 1 suitable for different width electrode sheets 2000 or different perforation area requirements can be combined on the same mandrel 10. This eliminates the need to customize an integral and expensive micro needle roller 1 for each new product, thereby improving the applicability of micro needle roller 1 and further reducing the cost of micro needle roller 1.

[0062] For example, the needle roller unit 11 is constructed as a cylindrical structure, which extends axially to form a hollow cavity, and the mandrel 10 passes through the hollow cavity and the needle roller unit 11 and the mandrel 10 are interference-fitted.

[0063] Example 2

[0064] like Figure 1 As shown, the micro needle roller 1 further includes two stop members 13. One stop member 13 is located at one axial end of the mandrel 10, and the other stop member 13 is located at the other axial end of the mandrel 10. Multiple needle roller units 11 are disposed between one stop member 13 and the other stop member 13. At least one stop member 13 is detachably connected to the mandrel 10; the two stop members 13 can move towards or away from each other on the mandrel 10. When the two stop members 13 move towards each other, they can apply an axial clamping force to the multiple needle roller units 11 from both ends. This means that a stop 13 applies a first clamping force toward another stop 13 to an adjacent needle roller unit 11, which is transmitted sequentially between two adjacent needle roller units 11 and finally to the needle roller unit 11 adjacent to the other stop 13. Meanwhile, the needle roller unit 11 adjacent to the other stop 13 applies a second clamping force toward a stop 13 to its adjacent needle roller unit 11. The first and second clamping forces are opposite in direction and equal in magnitude along the axial direction of the mandrel 10. Through this bidirectional clamping structure, multiple needle roller units 11 can be axially fixed on the mandrel 10, effectively reducing the axial movement of the needle roller units 11 during processing, improving the accuracy of the drilling position of the micro needle 12, and thus improving the processing quality of the blind holes of the electrode 2000.

[0065] When it is necessary to add a needle roller unit 11 to the mandrel 10 or to remove the needle roller unit 11 from the mandrel 10, the two stops 13 move in opposite directions, and at least one of the stops 13 is removed from the end of the mandrel 10.

[0066] In one specific example, one stop 13 is constructed as an annular baffle on the outer circumferential surface of the mandrel 10, the outer diameter of which is larger than the inner diameter of the needle roller unit 11. Another stop 13 is constructed as a locking nut, which is screwed onto the mandrel 10 and can be detached from the end of the mandrel 10.

[0067] like Figure 1 As shown, an axial spacing retainer 14 is provided between two adjacent needle roller units 11 to reduce rigid collisions between two adjacent needle roller units 11.

[0068] like Figure 1 As shown, in a specific application scenario, an axial spacing retainer 14 is also provided between one stop 13 and the adjacent needle roller unit 11, and an axial spacing retainer 14 is also provided between another stop 13 and the adjacent needle roller unit 11.

[0069] For example, the axial spacer retainer 14 is specifically constructed as a spacer sleeve fitted onto the mandrel 10.

[0070] Example 3

[0071] Combination Figure 1 and Figure 2 As shown, the microneedles 12 are further distributed in an array on the outer peripheral surface of the needle roller unit 11. Here, the array distribution means that along the axial direction of the needle roller unit 11 (i.e., the axial direction of the spindle 10), the microneedles 12 are uniformly arranged at a first preset spacing; and along the circumferential direction of the needle roller unit 11 (i.e., the circumferential direction of the spindle 10), the microneedles 12 are also uniformly distributed at a preset angle or a second preset spacing. Thus, by distributing the microneedles 12 array on the outer peripheral surface of the needle roller unit 11, the blind holes on the electrode 2000 are uniformly distributed, avoiding structural fragility of the electrode 2000 due to dense blind holes, or poor ion transport due to sparse blind holes, ultimately ensuring the consistency of battery performance.

[0072] For example, the first preset spacing can be 60μm to 75μm. Specifically, the first preset spacing can be 60μm, 65μm, 70μm, 75μm, etc. There is no limitation on the first preset spacing. Those skilled in the art can select from the range of 60μm to 75μm according to actual production requirements.

[0073] For example, the second preset spacing can be 60μm to 75μm. Specifically, the second preset spacing can be 60μm, 65μm, 70μm, 75μm, etc. There is no limitation on the second preset spacing here; those skilled in the art can select from the range of 60μm to 75μm according to actual production requirements.

[0074] Combination Figure 1 and Figure 2 As shown, the microneedle 12 is further constructed as a frustum structure; along the radial direction of the needle roller unit 11 and away from the side of the needle roller unit 11, the diameter of the frustum structure gradually decreases. Unlike the conical structure, the gradual diameter of the frustum structure makes the contact between the microneedle 12 and the electrode 2000 progressive, gradually increasing the contact area with the electrode 2000, which can reduce the cracking or peeling of the surface layer (such as the active material layer, current collector coating) of the electrode 2000 due to sharp point impact.

[0075] For example, the height of the frustum structure is 50 μm to 60 μm.

[0076] For example, the small-diameter end of the frustum structure has a diameter of 10 μm to 15 μm.

[0077] For example, the large-diameter end of the frustum structure has a diameter of 40 μm to 60 μm.

[0078] As can be seen from the above embodiments, along the axial direction of the needle roller unit 11 (i.e., the axial direction of the mandrel 10), the microneedles 12 are evenly arranged according to a first preset spacing, that is, the center distance between two adjacent frustum structures in this direction is the first preset spacing. Along the circumferential direction of the needle roller unit 11 (i.e., the circumferential direction of the mandrel 10), the microneedles 12 are also evenly distributed according to a preset angle or a second preset spacing, that is, the center distance between two adjacent frustum structures in this direction is the second preset spacing.

[0079] Example 4

[0080] like Figure 3 As shown, a second aspect embodiment of the present invention provides an electrode punching device 100, which includes a base 2, a support roller 3, a roller gap adjustment mechanism 4, and a micro needle roller 1 according to the first aspect embodiment of the present invention; the support roller 3 is rotatably mounted on the base 2; the micro needle roller 1 is rotatably mounted on the base 2; the support roller 3 and the micro needle roller 1 are arranged opposite to each other and define a roller gap; the roller gap adjustment mechanism 4 adjusts the size of the roller gap by driving the micro needle roller 1 and the support roller 3 to move towards or away from each other; wherein, the micro needles 12 on the micro needle roller 1 are configured to process blind holes on the electrode 2000 when the electrode 2000 passes through the roller gap.

[0081] The relative arrangement of the support roller 3 and the micro needle roller 1 means that the support roller 3 and the micro needle roller 1 are in a face-to-face correspondence in the spatial layout of the device: their axes are parallel to each other and their outer peripheral surfaces face each other, and the center distance between them is greater than the sum of their radii to form a roller gap.

[0082] As can be seen from the technical solution, the embodiments provided by the present invention have the following advantages:

[0083] (1) When the electrode 2000 passes through the roll gap, the support roller 3 supports one side surface of the electrode 2000, and the micro needle roller 1 presses on the other side surface of the electrode 2000. The micro needles 12 protruding from the outer circumferential surface of the micro needle roller 1 process blind holes on the electrode 2000, thereby improving the energy density and charge / discharge performance of the battery. In addition, by rotating the support roller 3 and the micro needle roller 1 on the base 2, the resistance encountered by the electrode 2000 when passing through the roll gap can be reduced, and the electrode 2000 can pass through the roll gap more smoothly and steadily, which is beneficial to improving the integrity of the surface structure of the electrode 2000.

[0084] (2) By setting the micro needle roller 1 as described above, when the micro needle 12 on the micro needle roller 1 is damaged, it is only necessary to locate and replace the needle roller unit 11 where the damaged micro needle 12 is located, without replacing the entire micro needle roller 1, thus reducing equipment costs.

[0085] (3) By replacing the needle roller unit 11 with different specifications (such as different lengths and different micro needle 12 arrangement patterns) on the mandrel 10, or by increasing or decreasing the number of needle roller units 11, micro needle roller 1 suitable for different width electrode sheets 2000 or different perforation area requirements can be combined on the same mandrel 10. This eliminates the need to customize an integral and expensive micro needle roller 1 for each new product, thereby improving the applicability of micro needle roller 1 and further reducing the cost of micro needle roller 1.

[0086] like Figure 4 As shown, further, both ends of the microneedle roller 1 are slidably mounted on the base 2 via microneedle roller bearing seats 15. The roller gap adjustment mechanism 4 includes a driving member 41 and a wedge structure 42; the wedge structure 42 is mounted on the base 2, and the inclined surface 4211 of the wedge structure 42 abuts against the microneedle roller bearing seat 15; the driving member 41 is used to drive the microneedle roller bearing seat 15 to move along the inclined surface 4211 of the wedge structure 42, thereby causing the microneedle roller bearing seat 15 to move the microneedle roller 1 closer to or away from the support roller 3. That is to say, both ends of the microneedle roller 1 are slidably mounted on the base 2 via microneedle roller bearing seats 15, the wedge structure 42 of the roller gap adjustment mechanism 4 is mounted on the base 2, the inclined surface 4211 of the wedge structure contacts the microneedle roller bearing seat 15, and the driving member 41 drives the microneedle roller bearing seat 15 to move along the inclined surface 4211, thereby causing the microneedle roller 1 to move closer to or away from the support roller 3 to adjust the roller gap. Thus, the wedge structure 42 uses the inclined surface 4211 to convert the power of the drive component 41 into the displacement of the micro needle roller 1, thereby achieving fine adjustment of the roller gap size and adapting to electrode sheets 2000 of different thicknesses. The micro needle roller bearing seat 15 cooperates with the inclined surface 4211 to improve the smoothness of the movement of the micro needle roller 1 and reduce the offset of the micro needle roller 1. Furthermore, the structure is simple and reliable, easy to maintain, can stably adjust the roller gap, improve the processing quality of blind holes, and enhance the adaptability and stability of the device.

[0087] In a specific example, the driving end of the drive member 41 is connected to the side of the microneedle roller bearing seat 15 away from the support roller 3, and the wedge structure 42 is disposed between the support roller 3 and the microneedle roller bearing seat 15 and abuts against the side of the microneedle roller bearing seat 15 facing the support roller 3.

[0088] like Figure 4 As shown, in a specific example, a microneedle roller bearing housing 15 contains a first rotary bearing. One end of the spindle 10 of the microneedle roller 1 is rotatably mounted on the microneedle roller bearing housing 15 via the first rotary bearing. The microneedle roller bearing housing 15 is slidably mounted on the base 2 via a linear guide pair 17. Another microneedle roller bearing housing 15 contains another first rotary bearing. The other end of the spindle 10 of the microneedle roller 1 is rotatably mounted on another microneedle roller bearing housing 15 via the other first rotary bearing. The other microneedle roller bearing housing 15 is slidably mounted on the base 2 via another linear guide pair 17.

[0089] like Figure 4 As shown, further, a retaining bearing 16 is fitted onto the outer surface of the microneedle roller bearing housing 15, and the retaining bearing 16 is coaxially arranged with the microneedle roller 1. The outer ring of the retaining bearing 16 is constructed as a first flange, a second flange, and a tread surface disposed between the first flange and the second flange, spaced apart along the axial direction. The wedge structure 42 includes an inclined block 421, on which an inclined surface 4211 is provided, the inclined surface 4211 being used to abut against the tread surface of the retaining bearing 16.

[0090] like Figure 4 As shown, the wedge structure 42 further includes a wedge block 421, a mounting frame 422, and a lead screw 423. The wedge block 421 is mounted on the base 2 via the mounting frame 422. The wedge block 421 is slidably mounted in the mounting frame 422. The wedge block 421 is also provided with a through hole, and the inner wall of the through hole is provided with the internal thread of the lead screw 423. By rotating the lead screw 423, the wedge block 421 is driven to move in the mounting frame 422. The inclined surface 4211 of the wedge block 421 faces the backing bearing 16. When the wedge block 421 moves, the position of the inclined surface 4211 is adjusted, thereby adjusting the contact position between the backing bearing 16 and the inclined surface 4211, thereby increasing the adjustment range of the roll gap.

[0091] like Figure 3 As shown, the roll gap adjustment structure further includes a dial indicator 43, which is mounted on the base 2 and used to measure the roll gap size.

[0092] like Figure 3 and Figure 4 As shown, the electrode punching device 100 further includes a debris cleaning component 5; the debris cleaning component 5 is located on the side of the micro needle roller 1 that is different from the support roller 3 and is used to clean debris on the outer peripheral surface of the needle roller unit 11.

[0093] In a specific application scenario, the debris cleaning device 5 and the support roller 3 are located on different sides of the microneedle roller 1, for example, on opposite sides of the microneedle roller 1. This avoids the debris cleaning device 5 interfering with the conveying of the electrode 2000. During the blind hole processing, the support roller 3 supports one side of the electrode 2000, and the microneedles 12 on the microneedle roller 1 press against the other side of the electrode 2000 to process the blind hole. The debris cleaning device 5 can clean the debris on the outer circumferential surface of the microneedle roller 1, improving the quality of the electrode 2000.

[0094] like Figure 4 As shown, the debris cleaning device 5 further includes an air knife assembly 51 and a negative pressure collection device 52. The air knife assembly 51 uses high-speed, high-pressure gas to blow and clean the surface of the micro needle roller 1. The negative pressure collection device 52 includes a negative pressure dust collection gun head, which collects the debris blown off by the air knife under negative pressure.

[0095] like Figure 5 As shown, the electrode punching device 100 further includes a scraper assembly 8. The scraper of the scraper assembly 8 is located on the side of the support roller 3 that is different from the micro needle roller 1. The scraper contacts the outer peripheral surface of the support roller 3 along the axial direction of the support roller 3, so that the scraper can scrape off the debris on the outer peripheral surface of the support roller 3 when the support roller 3 rotates.

[0096] like Figure 5 and Figure 6 As shown, the electrode punching device 100 further includes a first electrode punching device 101, a second electrode punching device 102, and an electrode buffer mechanism 6. The first electrode punching device 101 and the second electrode punching device 102 are spaced apart on the electrode conveying path and are respectively used to process blind holes on different surfaces of the electrode 2000. The electrode buffer mechanism 6 is used to compensate for the difference in electrode conveying speed between the first electrode punching device 101 and the second electrode punching device 102. That is to say, in the direction perpendicular to the electrode conveying path, the micro-needle roller 1 of the first electrode punching device 101 is located on one side of the electrode 2000, and the support roller 3 of the first electrode punching device 101 is located on the other side of the electrode 2000; the micro-needle roller 1 of the second electrode punching device 102 is located on the other side of the electrode 2000, and the support roller 3 of the first electrode punching device 101 is located on one side of the electrode 2000. Therefore, as the electrode 2000 travels along the electrode transport path, it sequentially passes through the first electrode drilling device 101 and the second electrode drilling device 102. The first electrode drilling device 101 processes blind holes on one side of the electrode 2000, and the second electrode drilling device 102 processes blind holes on the other side of the electrode 2000. By providing the electrode buffer mechanism 6 between the first electrode drilling device 101 and the second electrode drilling device 102, it is beneficial to compensate for the difference in electrode transport speed between the two devices.

[0097] The following is combined with Figures 3-5 Describe a specific example.

[0098] The electrode punching device 100 includes a frame 7, a first electrode punching device 101, a second electrode punching device 102, and an electrode buffer mechanism 6.

[0099] The first electrode drilling device 101 includes a base 2, a support roller 3, a roller gap adjustment mechanism 4, and a micro-needle roller 1. The support roller 3 includes a support roller body 30, a support roller bearing seat 31, and a support roller rotation power component 32. Both ends of the support roller body 30 are mounted on the base 2 via the support roller bearing seat 31. The support roller bearing seat 31 contains a support roller bearing, and both ends of the support roller body 30 are rotatably mounted on the support roller bearing seat 31 via the support roller bearing. The support roller rotation power component 32 is connected to one end of the support roller body 30 and is used to drive the support roller body 30 to rotate. When the support roller body 30 rotates, it drives the electrode 2000 to travel along the electrode conveying path, thereby causing the micro-needle roller 1 to continuously perform blind hole processing on the surface of the electrode 2000.

[0100] The structure of the second electrode punching device 102 is the same as that of the first electrode punching device 101. The difference is that the micro needle roller 1 of the first electrode punching device 101 is located on one side of the electrode 2000, and the support roller 3 of the first electrode punching device 101 is located on the other side of the electrode 2000; the micro needle roller 1 of the second electrode punching device 102 is located on the other side of the electrode 2000, and the support roller 3 of the first electrode punching device 101 is located on one side of the electrode 2000. This will not be described in detail here.

[0101] The first electrode punching device 101, the second electrode punching device 102, and the electrode buffer mechanism 6 are all mounted on the frame 7. A sub-path for electrode 2000 transmission is defined between the first electrode punching device 101 and the second electrode punching device 102. This sub-path for electrode 2000 transmission is part of the electrode transport path.

[0102] The electrode buffer mechanism 6 is located between the first electrode punching device 101 and the second electrode punching device 102.

[0103] The electrode buffer mechanism 6 includes a tension roller 62 mounted on the frame 7 and a buffer roller sway 61 mounted on the frame 7. The axes of the tension roller 62 and the buffer roller sway 61 are parallel. The buffer roller sway 61 is movably mounted on the frame 7. When the buffer roller sway 61 moves, it adjusts the center distance between itself and the tension roller 62, thereby increasing or decreasing the length of the electrode 2000 transmission sub-path. This absorbs and adjusts the tension and linear speed difference between the two sets of needle roller imprinting assemblies to achieve continuous double-sided processing of the strip.

[0104] The frame 7 is also equipped with a roller assembly 9, which is located downstream of the second electrode punching device 102 and between the electrode punching device 100 and the next process to tension the electrode 2000 and facilitate transition.

[0105] Example 5

[0106] like Figure 7 As shown, a third aspect embodiment of the present invention provides an electrode forming apparatus 1000, which includes an electrode driving assembly 200 and an electrode punching device 100 according to a second aspect embodiment of the present invention. The electrode driving assembly 200 is used to drive the electrode 2000 to move along the electrode conveying path; the rolling assembly 300 is used to roll the electrode 2000; and the electrode punching device 100 is located downstream of the rolling assembly 300 and is used to process blind holes on the surface of the electrode 2000.

[0107] In a specific application scenario, the electrode driving assembly 200 includes an unwinding device 201 and a winding device 202. The electrode driving assembly 200 is used to guide the electrode 2000 to form an electrode conveying path from the unwinding device 201 to the winding device 202. The rolling assembly 300 is located between the unwinding device 201 and the winding device 202 and is used to roll the electrode 2000. The electrode punching device 100 is located downstream of the rolling assembly 300 and performs blind hole processing on both sides of the rolled electrode 2000 to increase the surface contact area and optimize the electron flow path, thereby achieving the process objective of increasing battery energy density and optimizing charge and discharge performance.

[0108] Example 6

[0109] A fourth aspect of the present invention provides an electrode forming process 2000, applied to the electrode forming equipment 1000 of the third aspect of the present invention, comprising the following steps:

[0110] Step S1: Drive the electrode 2000 along the electrode conveying path using the electrode drive assembly 200;

[0111] The electrode driving assembly 200 includes an unwinding device 201 and a winding device 202. The electrode driving assembly 200 is used to pull the electrode 2000 to form an electrode conveying path from the unwinding device 201 to the winding device 202. The rolling assembly 300 is disposed between the unwinding device 201 and the winding device 202 and is used to roll the electrode 2000.

[0112] Step S2: Roll the electrode sheet 2000 using the roll forming assembly 300;

[0113] The rolling assembly 300 includes a pair of rolls arranged opposite each other to form a gap for rolling the electrode 2000. The rolling assembly rolls the electrode 2000 as it passes through the gap.

[0114] Step S3: Blind holes are machined on the rolled electrode 2000 using the electrode punching device 100.

[0115] The electrode punching device 100 is located downstream of the rolling assembly 300 and performs blind hole processing on both sides of the rolled electrode 2000.

[0116] Other configurations and operations of the electrode forming apparatus 1000 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here. In the description of the present invention, "first feature" and "second feature" may include one or more of the features. The vertical, horizontal, and front-back directions are defined as shown in the figures.

[0117] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0118] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. 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.

[0119] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A microneedle roller, characterized in that, include: mandrel (10); Multiple needle roller units (11) are coaxially sleeved on the mandrel (10), and micro needles (12) are protruding on the outer peripheral surface of the needle roller unit (11) to process blind holes on the electrode sheet (2000).

2. The microneedle roller according to claim 1, characterized in that, The micro needle roller also includes two stop members (13) respectively disposed at both ends of the mandrel (10), and the plurality of needle roller units (11) are disposed between the two stop members (13); At least one of the stop members (13) is detachably connected to the mandrel (10). The two stops (13) are capable of moving towards each other and away from each other on the spindle (10); When the two stops (13) move toward each other, they can apply an axial clamping force to the plurality of needle roller units (11) from both ends.

3. The microneedle roller according to claim 2, characterized in that, An axial spacing retainer (14) is provided between two adjacent needle roller units (11).

4. The microneedle roller according to claim 1, characterized in that, The microneedle (12) array is distributed on the outer peripheral surface of the needle roller unit (11).

5. An electrode drilling device, characterized in that, include: Microneedle roller according to any one of claims 1-4; Base (2); The support roller (3) is rotatably mounted on the base (2); The microneedle roller is rotatably mounted on the base (2); The support roller (3) and the micro needle roller are arranged opposite to each other and define a roller gap; The roller gap adjustment mechanism (4) adjusts the size of the roller gap by driving the micro needle roller and the support roller (3) to move towards or away from each other; The microneedles (12) on the microneedle roller are configured to process blind holes on the electrode (2000) when the electrode (2000) passes through the roller gap.

6. The electrode drilling device according to claim 5, characterized in that, Both ends of the microneedle roller are slidably mounted on the base (2) via microneedle roller bearing seats (15); The roll gap adjustment mechanism (4) includes a drive element (41) and a wedge structure (42). The wedge structure (42) is disposed on the base (2), and the inclined surface (4211) of the wedge structure (42) abuts against the micro needle roller bearing seat (15); The drive unit (41) is used to drive the microneedle roller bearing seat (15) to move along the inclined surface (4211) of the wedge structure (42), thereby causing the microneedle roller bearing seat (15) to move the microneedle roller closer to or away from the support roller (3).

7. The electrode drilling device according to claim 5, characterized in that, It also includes a debris cleaning component (5); The debris cleaning component (5) is located on the side of the micro needle roller that is different from the support roller (3) and is used to clean debris on the outer peripheral surface of the needle roller unit (11).

8. The electrode drilling device according to claim 5, characterized in that, The electrode punching device includes a first electrode punching device (101), a second electrode punching device (102), and an electrode buffer mechanism (6). The first electrode punching device (101) and the second electrode punching device (102) are spaced apart on the electrode conveying path and are respectively used to process blind holes on different surfaces of the electrode (2000). The electrode buffer mechanism (6) is used to compensate for the difference in electrode conveying speed between the first electrode punching device (101) and the second electrode punching device (102).

9. An electrode forming device, characterized in that, include: An electrode drive assembly (200) is used to drive the electrode (2000) to move along the electrode transport path; Roll forming assembly (300) for rolling electrode sheet (2000); The electrode punching apparatus according to any one of claims 6-8 is located downstream of the rolling assembly (300) and is used to process blind holes on the electrode (2000).

10. An electrode (2000) forming process, applied to the electrode forming equipment according to claim 9, characterized in that, Includes the following steps: Step S1: Drive the electrode (2000) along the electrode transport path using the electrode driving assembly (200); Step S2: Roll the electrode sheet (2000) using the roller pressing assembly (300); Step S3: Blind holes are machined on the rolled electrode sheet (2000) using the electrode sheet drilling device.

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