Battery current collector surface micropore processing equipment

Abstract

The invention relates to the technical field of battery current collector processing, in particular to battery current collector surface micropore processing equipment which comprises an unwinding unit, a processing unit and a winding unit which are sequentially arranged along a processing path, the processing unit comprises a surface pretreatment device used for carrying out plasma treatment on the surface of the current collector; the micropore electrolysis device is arranged at the downstream of the surface pretreatment device and is used for carrying out electrolytic machining on the current collector subjected to plasma treatment so as to form micropores; and the post-treatment device is arranged at the downstream of the microporous electrolysis device and is used for cleaning and drying the current collector subjected to electrolytic machining. Therefore, the problems of poor machining precision, low production efficiency, high implementation cost and unstable product quality of a current collector surface micromachining technology in the prior art to different degrees can be solved.

Description

Battery current collector surface micropore processing equipment Technical Field

[0001] This invention relates to the field of battery current collector processing technology, specifically to a device for processing micropores on the surface of battery current collectors. Background Technology

[0002] Against the backdrop of the rapid development of the new energy industry, energy density, charge-discharge efficiency, cycle life, and safety are key technical indicators for batteries. As a crucial component inside the battery that carries active materials and conducts current, the surface structure and performance of the current collector directly affect the interfacial reaction kinetics and overall performance of the battery. An ideal current collector not only needs excellent conductivity to reduce internal resistance but also needs to form a stable interfacial bond with the active material to prevent detachment, while providing an effective channel for electrolyte wetting and ion transport. Therefore, the surface microstructure design and precision machining of current collectors have become one of the key aspects of improving battery performance.

[0003] Traditional battery current collectors typically use smooth metal foils (such as copper foil and aluminum foil). However, this flat structure has several limitations in practical applications: First, the bonding between the current collector and the active material (such as positive and negative electrode materials) relies mainly on physical adsorption, resulting in weak interfacial adhesion. During long-term charge-discharge cycles, the active material is prone to peeling due to volume changes, leading to battery capacity decay and shortened cycle life. Second, the smooth surface is not conducive to sufficient electrolyte wetting, limiting the ion transport efficiency at the interface and affecting the battery's rate performance. Third, as batteries develop towards higher energy density and thinner designs, the thickness and single structure of traditional current collectors are insufficient to meet the requirements of maintaining high performance while reducing thickness.

[0004] To overcome the above limitations, existing technologies have proposed a variety of schemes for constructing microstructures (such as micro-convex shapes and micropores) on the surface of current collectors, mainly including machining, laser processing, chemical etching and electrolytic processing.

[0005] Machining technology, employing roll forming combined with stamping or drilling, can create micro-shapes and micro-holes on the surface of the current collector. This approach has relatively low equipment costs, but it suffers from limitations such as limited processing accuracy (micro-hole size greater than 30 micrometers), the stamping process easily leading to micro-structural deformation or burrs, and low processing efficiency making it difficult to adapt to continuous roll-to-roll production.

[0006] Laser processing technology utilizes high-energy lasers (such as ultraviolet lasers and femtosecond lasers) for etching or perforation, offering advantages such as high processing precision and flexible pattern design. However, this approach also suffers from problems such as high equipment investment and maintenance costs, the potential for laser thermal effects to create oxide layers or heat-affected zones on material surfaces, and a trade-off between processing speed and the cost of large-scale production.

[0007] Chemical etching technology, which combines photolithographic masks with chemical etching solutions to process microholes, can achieve high dimensional accuracy. However, this process is complex, involves multiple steps, has a long production cycle, and the etching solutions often contain pollutants such as heavy metals, resulting in high costs for subsequent environmental treatment.

[0008] Electrochemical machining (ECM) technology, based on the principle of electrochemical anodic dissolution, is considered a promising technology due to its potential for continuous production without mechanical stress or heat-affected zones. However, current ECM solutions still face several challenges, such as: electrode dissolution during processing, potentially contaminating the electrolyte and workpiece surface; fluctuations in electrolyte parameters (e.g., temperature, concentration) leading to insufficient processing stability and consistency; inadequate attention to the treatment of the original oxide layer on the current collector surface, affecting the uniformity of the initial processing stage; and imperfect post-processing steps potentially resulting in electrolyte residue, impacting the cleanliness and conductivity of the final product.

[0009] Existing surface micromachining technologies for current collectors suffer from varying degrees of problems, including poor machining accuracy, low production efficiency, high implementation costs, and unstable product quality. These challenges are particularly acute in industrial applications requiring high precision (e.g., 1-20 micrometer micropores), efficient continuous production, and controllable costs. Therefore, there is an urgent need to optimize and improve current surface micromachining technologies for current collectors to address these existing problems. Summary of the Invention

[0010] The purpose of this invention is to provide a micro-hole processing device for the surface of battery current collectors, which can solve the problems of poor processing accuracy, low production efficiency, high implementation cost and unstable product quality in the existing micro-processing technology for current collector surfaces.

[0011] To achieve the above objectives, the present invention provides the following technical solution: a micropore processing device for a battery current collector surface, comprising an unwinding unit, a processing unit, and a rewinding unit arranged sequentially along a processing path; the processing unit includes: a surface pretreatment device for plasma treatment of the current collector surface; a micropore electrolysis device, disposed downstream of the surface pretreatment device, for electrolytic processing of the plasma-treated current collector to form micropores; and a post-processing device, disposed downstream of the micropore electrolysis device, for cleaning and drying the electrolytically processed current collector.

[0012] Alternatively, the surface pretreatment device includes a plasma generator and an adjustment mechanism, wherein the plasma generator is disposed on at least one side of the current collector conveyor path and is mounted on the moving end of the adjustment mechanism.

[0013] Alternatively, the adjustment mechanism includes a gantry and a lifting and traversing mechanism disposed on the gantry, and the plasma generator is connected to the movable end of the lifting and traversing mechanism.

[0014] Alternatively, the microporous electrolysis device includes an electrolytic cell, at least one pair of graphite electrodes located within the electrolytic cell, and a conductive roller assembly for conveying and electrically connecting a current collector, wherein the graphite electrodes are connected to the positive terminal of a power source, and the conductive roller assembly is connected to the negative terminal of the power source.

[0015] Alternatively, in the microporous electrolysis device, the current collector passes between a pair of graphite electrodes and is arranged parallel to and equidistant from the graphite electrodes on both sides; and the graphite electrodes are positioned adjustablely within the electrolytic cell.

[0016] Alternatively, the battery current collector surface micropore processing equipment may further include an electrolyte circulation supply device connected to the electrolytic cell.

[0017] Alternatively, the battery current collector surface micropore processing equipment further includes a controller and a pH detector, the pH detector being used to detect the pH value of the electrolyte in the electrolytic cell, the controller being communicatively connected to the pH detector, and the controller being configured to control the operating state of the electrolyte circulation supply device at least according to the pH value.

[0018] Alternatively, the cleaning unit of the post-treatment device is an ultrasonic cleaning tank; and / or, the drying unit of the post-treatment device includes a hot air drying section and an infrared drying section.

[0019] Alternatively, the current collector processed by the battery current collector surface micropore processing equipment is a metal foil with a microstructure on its surface.

[0020] Optionally, a tension control roller group for tensioning the current collector is also provided between the unwinding unit and the winding unit.

[0021] Compared with existing technologies, the beneficial effects of this invention are as follows: By using the above technical solution as an independent and prioritized process, the problem of uneven starting point and high reaction resistance caused by the presence of the original oxide layer on the current collector surface can be solved, thus providing stable and consistent initial surface conditions for subsequent high-precision electrolytic micro-hole processing. The micro-hole electrolysis device receives the ideal surface after pretreatment and processes the micro-holes through electrochemical dissolution. This process is stress-free, avoiding micro-shape collapse or burr formation; it also avoids heat-affected zones, preventing material phase transformation or oxidation. The post-treatment device then removes processing residues, ensuring the cleanliness of the micro-holes and the entire current collector. Through the processing path of pretreatment, electrolytic hole formation, and final cleaning, precise processing of micro-hole dimensions is achieved, with no contamination or damage to the overall surface. The three core processing units are arranged sequentially along the production line and seamlessly connected with the unwinding and rewinding units before and after, forming a complete roll-to-roll continuous processing equipment. This can effectively improve the production cycle and overall efficiency, while reducing the risk of pollution, scratches or deformation that may be caused by intermediate transfers. It is suitable for large-scale and stable industrial production needs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 is a schematic diagram of the structure of the battery current collector surface micropore processing equipment provided by the present invention in one embodiment; Figure 2 is a schematic diagram of the structure of the surface pretreatment device in the battery current collector surface micropore processing equipment provided by the present invention in one embodiment; Figure 3 is a partial schematic diagram of the structure of the micropore electrolysis device in the battery current collector surface micropore processing equipment provided by the present invention in one embodiment; Figure 4 is a schematic diagram of the structure of the micro-shaped current collector; Figure 5 is a schematic diagram of the structure of the micro-shaped micropore current collector.

[0023] The attached diagram shows the following components and their corresponding names: 1-Unwinding unit, 2-Processing unit, 21-Surface pretreatment device, 211-Plasma generator, 212-Gantry frame, 213-Lifting and traversing mechanism, 22-Microporous electrolysis device, 221-Electrolytic cell, 222-Graphite electrode, 223-Conductive roller group, 224-Electrolyte, 225-Discharge port, 23-Post-processing device, 231-Cleaning unit, 232-Drying unit, 3-Rewinding unit, 4-Power supply, 5-pH detector, 6-Bearing device, 61-Support, 62-Guide roller, 100-Current collector. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that while the description of these embodiments is intended to aid in understanding the invention, it does not constitute a limitation thereof. The specific structural and functional details disclosed herein are only for describing exemplary embodiments of the invention. However, the invention can be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0025] According to specific embodiments of this disclosure, a device for processing micropores on the surface of a battery current collector is provided. Figures 1 to 5 illustrate specific embodiments thereof.

[0026] Referring to Figures 1 to 5, the battery current collector surface micropore processing equipment includes an unwinding unit 1, a processing unit 2, and a winding unit 3 arranged sequentially along the processing path. The processing unit 2 includes: a surface pretreatment device 21 for plasma treatment of the current collector 100 surface; a micropore electrolysis device 22, located downstream of the surface pretreatment device 21, for electrolytic processing of the plasma-treated current collector 100 to form micropores; and a post-processing device 23, located downstream of the micropore electrolysis device 22, for cleaning and drying the electrolytically processed current collector 100.

[0027] The working process of the battery current collector surface micropore processing equipment is as follows: After the metal foil current collector 100 with micro-shaped surfaces is led out from the unwinding unit 1, it first enters the surface pretreatment device 21 of the processing unit 2. In this device, the surface of the current collector 100 is subjected to plasma treatment. This process can effectively clean and activate the surface of the current collector 100, especially removing its naturally formed dense metal oxide layer (such as Al2O3 on the surface of aluminum foil or CuO / Cu2O on the surface of copper foil), and avoiding damage to the micro-shaped structure itself. After pretreatment, the surface of the current collector 100 exhibits a clean and activated metallic state.

[0028] Subsequently, the current collector 100 is conveyed to a downstream microporous electrolysis device 22. In this device, the pretreated current collector 100, acting as a cathode, is immersed in or passes through a specific electrolyte environment 224, and a controllable electric field is applied between the graphite electrodes 222, which act as the anode. Under the principle of electrochemical anodic dissolution, the micro-shaped protrusions on the surface of the current collector 100 undergo selective and precise dissolution, thereby forming micropores of a predetermined size. Since the pretreatment removes the insulating oxide layer, the electrolysis reaction can be initiated and carried out on a clean, uniformly conductive metal surface, ensuring the initial uniformity of the current distribution.

[0029] After the microporous electrolytic processing is completed, the current collector 100 continues to enter the downstream post-processing unit 23. This unit first cleans the current collector 100 to remove any residual electrolyte 224 and reaction byproducts that may remain on its surface and inside the micropores. Next, it is dried to remove the moisture from the cleaning process, resulting in a dry and clean finished product. Finally, the processed current collector 100 is wound and collected by the winding unit 3, completing continuous production.

[0030] By employing the aforementioned technical solution, plasma surface pretreatment is treated as an independent and prioritized process. This addresses the issues of uneven starting points and high reaction resistance in electrolytic machining caused by the presence of a native oxide layer on the surface of the current collector 100, thus providing stable and consistent initial surface conditions for subsequent high-precision electrolytic micro-hole machining. The micro-hole electrolysis device 22 receives the ideal pretreated surface and processes the micro-holes through electrochemical dissolution. This process is stress-free, preventing micro-shape collapse or burr formation; it also eliminates the heat-affected zone, avoiding material phase transformation or oxidation. The post-treatment device 23 then removes machining residues, ensuring the cleanliness of the micro-holes and the entire current collector 100. Through this pretreatment, electrolytic hole formation, and final cleaning process, precise micro-hole size machining is achieved, with no contamination or damage to the overall surface. The three core processing units are arranged sequentially along the production line and seamlessly connected with the unwinding and rewinding units 3 before and after, forming a complete roll-to-roll continuous processing equipment. This can effectively improve the production cycle and overall efficiency, while reducing the risk of pollution, scratches or deformation that may be caused by intermediate transfers. It is suitable for large-scale and stable industrial production needs.

[0031] It should be noted that directional terms such as "inner" and "outer" refer to "inner" and "outer" relative to the outline of the component. "Inner" refers to the direction towards the inside of the component, and "outer" refers to the direction away from it. Furthermore, terms such as "first" and "second" are used to distinguish one element from another and do not indicate sequence or importance. Moreover, in the following descriptions with accompanying drawings, the same reference numerals in different drawings represent the same element. The phrase "and / or" in the text refers to A and / or B, indicating that there are three possible scenarios: only A, only B, and both A and B. The phrase " / and" in the text refers to A and B, indicating that there are two possible scenarios: only A and both A and B.

[0032] In one embodiment of this disclosure, the surface pretreatment apparatus 21 includes a plasma generator 211 and an adjustment mechanism. The plasma generator 211 is disposed on at least one side of the conveyor path of the current collector 100 and mounted on the moving end of the adjustment mechanism. The adjustment mechanism can adjust the vertical distance between the plasma generator 211 and the surface of the current collector 100. By controlling it within the optimal process range, it ensures that the plasma beam has sufficient energy density to effectively bombard and remove the oxide layer, while preventing local overheating or physical damage to the microstructure that may occur due to excessively close distance. In production, even if the current collector 100 experiences slight up-and-down movement due to tension fluctuations, or if there are slight differences in the thickness of different batches of foil, the adjustment mechanism can maintain the stability of this critical distance through real-time or preset adjustment, thereby ensuring the consistency of the pretreatment effect.

[0033] The adjustment mechanism can not only move vertically, but also drive the plasma generator 211 to perform scanning or point-to-point processing along the width of the current collector 100. This eliminates processing dead zones or uneven intensity problems that may occur with fixed installation, ensuring the uniformity of oxide layer removal across the entire width. Furthermore, this adjustment mechanism allows the processing unit 2 to adapt to the production of current collectors 100 with different widths, which can be achieved by adjusting the lateral movement range during processing, effectively enhancing the equipment's versatility.

[0034] Furthermore, the positioning mechanism includes a gantry 212 and a lifting and traversing mechanism 213 mounted on the gantry 212. The plasma generator 211 is connected to the movable end of the lifting and traversing mechanism 213. The gantry 212, as a load-bearing foundation, spans the conveyor path of the current collector 100, providing solid and stable support for the lifting and traversing mechanism 213 and the plasma generator 211. This avoids adverse effects on processing accuracy caused by the mechanism's own deflection or vibration, ensuring the absolute stability of the plasma generator 211's posture during complex movements, thus laying the foundation for precise control of the processing distance and scanning trajectory.

[0035] The lifting and lateral movement mechanism 213 integrates the functions of the vertical direction (lifting) and the horizontal direction (lateral movement), making the movements in the two directions independent and non-interfering. This allows for high-precision programming and control of the lifting height and lateral position based on the controller settings. Consequently, the plasma generator 211 can be precisely positioned to any target point in three-dimensional space, better adapting to current collectors 100 of varying thicknesses and enabling the execution of complex scanning paths.

[0036] To achieve precise lifting and lateral movement of the plasma generator 211, the lifting and lateral movement mechanism 213 can adopt a variety of mechanical structures.

[0037] In one embodiment, the lifting and traversing mechanism 213 employs a combination structure of cross roller guides and ball screws. Specifically, a ball screw pair is used as the core lifting drive mechanism. A servo motor drives the vertically mounted ball screw to rotate via a coupling, causing the screw nut that mates with it to move vertically, thereby providing lifting (Z-axis) power. A high-precision cross roller linear module is used as the traversing mechanism. This module includes a base, a slide, and built-in cross roller guides. The slide is directly or indirectly connected via the screw nut of the ball screw pair, and is driven by another servo motor to the synchronous belt or another set of ball screws within the module, enabling the slide to move precisely along the module direction (parallel to the belt direction of the current collector 100, X-axis).

[0038] The cross roller linear module is horizontally fixed on the crossbeam of the gantry 212. The plasma generator 211 is finally mounted on the slide of the linear module. The cross roller guide can withstand torque and load from all directions, with high rigidity and smooth operation; the ball screw provides precise lifting displacement without slippage, with extremely high overall positioning accuracy and repeatability.

[0039] In another embodiment, a combination of synchronous belt drive and linear guide rails is employed. Specifically, a set of parallel precision linear guide rail pairs (or guide rods) is used as the lifting and guiding mechanism to ensure the straightness of the movement. The lifting power is provided by a miniature synchronous belt drive system. A servo motor drives the drive wheel, which in turn drives the driven wheel or belt clamp connected to the lifting platform via the synchronous belt, realizing the vertical (Z-axis) movement of the platform. Similarly, a synchronous belt drive linear module is used as the transverse movement mechanism. This module consists of an aluminum profile base, a synchronous belt, a drive motor, and a slide table. The synchronous belt transverse movement module is horizontally mounted on the gantry 212. A lifting platform integrating linear guide rails and a synchronous belt lifting system is mounted on the slide table of the transverse movement module. The plasma generator 211 is fixed on this lifting platform. This structure utilizes the advantages of synchronous belt drive, such as low noise and high speed, making it suitable for applications requiring rapid reciprocating scanning. It also has a lighter overall weight and lower requirements for drive motor power.

[0040] In this regard, those skilled in the art can flexibly configure the structure of the lifting and traversing mechanism 213 according to the technical concept of this disclosure, and this disclosure does not limit it.

[0041] By utilizing the high-energy particle bombardment effect and chemical reactivity of plasma, the physical stripping and chemical decomposition of the oxide layer are achieved at low temperatures, while simultaneously activating the surface of the current collector 100, laying the foundation for subsequent microporous fabrication and bonding with battery active materials. This process requires no strong acids or alkalis and can precisely act on complex surfaces with microstructures (protrusions and depressions), avoiding damage to the current collector 100 substrate.

[0042] The oxide layer on the surface of micro-shaped current collectors 100 (such as copper foil and aluminum foil) is mostly a dense metal oxide (CuO and Cu2O on the surface of copper foil; Al2O3 on the surface of aluminum foil). Plasma treatment achieves efficient removal of the oxide layer through the synergistic effect of "physical bombardment" and "chemical decomposition". The specific process is as follows: A. Physical bombardment mechanism (sputtering stripping effect) High-energy ions in the plasma are accelerated by an electric field at high speed (10 4 -10 5 (m / s) Ion bombardment of the oxide layer on the surface of current collector 100: a. The kinetic energy of high-energy ions is transferred to the oxide layer atoms, breaking the chemical bonds inside the oxide layer (such as Al-O bonds, Cu-O bonds), causing the oxide layer to decompose from a "dense structure" into loose, tiny particles; continuous ion bombardment produces a "sputtering effect," peeling the loose oxide layer particles from the surface of current collector 100, exposing the clean metal substrate underneath; b. Chemical decomposition mechanism (free radical reaction effect) utilizes reducing gas plasma (such as H2, NH3); generating hydrogen free radicals. H, amino free radicals Reducing particles such as NH2 react with the oxide layer in a reduction reaction: For copper foil oxide layer: CuO + 2... H→Cu+H2O↑,Cu2O+2 H→2Cu+H2O↑, directly reducing the metal oxide to elemental copper (the substrate material) without residual impurities; for aluminum foil oxide layer: Al2O3+6 H→2Al+3H2O↑, the reduction product is elemental aluminum, and H2O escapes in gaseous form, avoiding the corrosion of the microstructure by liquid residue.

[0043] In one specific embodiment provided in this disclosure, the microporous electrolysis device 22 includes an electrolytic cell 221, at least one pair of graphite electrodes 222 located in the electrolytic cell 221, and a conductive roller group 223 for conveying and electrically connecting the current collector 100. The graphite electrodes 222 are connected to the positive terminal of the power supply 4, and the conductive roller group 223 is connected to the negative terminal of the power supply 4.

[0044] The graphite electrode 222 is chemically stable and hardly dissolves during electrolytic processing, thus avoiding the introduction of impurity metal ions (such as Fe) into the electrolyte 224 due to the dissolution of traditional metal anodes (such as stainless steel). 2+ Therefore, it avoids a series of problems caused by anode contamination, such as electrolyte turbidity, impurities adhering to the inner wall of micropores, and difficulty in subsequent cleaning, and can obtain a microporous surface with high cleanliness.

[0045] The conductive roller assembly 223 not only enables the conveying current collector 100 to pass through the electrolysis zone at a uniform speed, but also serves as the cathode (negative electrode) to maintain close electrical contact with the current collector 100, thereby providing it with a stable operating current. This configuration simplifies the structure, reduces the need for dedicated conductive contacts or clamps, thereby lowering contact resistance and the risk of arcing or uneven processing due to poor contact, and enabling efficient and stable current transmission.

[0046] Specifically, the conductive roller assembly is fixed to the bearing housing by acid- and alkali-resistant, high-temperature resistant ceramic bearings.

[0047] At least one pair of graphite electrodes 222 are symmetrically distributed on both sides of the current collector 100, with the current collector 100 passing through it, forming a symmetrical electric field space. This allows the two surfaces of the current collector 100 to undergo electrolytic reactions simultaneously and under the same conditions, improving processing efficiency. Simultaneously, the symmetrical structure facilitates the uniformity of the electric field distribution. Combined with the smooth surface and uniform current distribution of the graphite electrodes 222, edge effects are effectively reduced, resulting in micropores with higher consistency in size and morphology across the entire width and both surfaces of the current collector 100.

[0048] Furthermore, in the microporous electrolysis device 22, the current collector 100 travels between a pair of graphite electrodes 222 and is parallel to and equidistant from the graphite electrodes 222 on both sides. When the current collector 100 is strictly parallel to and equidistant from the graphite electrodes 222 on both sides, the electric field formed between the electrodes and the current collector 100 has a high degree of symmetry. The electric field lines can pass through the surfaces of both sides of the current collector 100 perpendicularly and uniformly, thereby eliminating the phenomenon of unilateral electric field concentration or weakening caused by unequal distances or angular deviations. The uniform and symmetrical electric field environment is a decisive factor that enables the micropores on both sides of the current collector 100 to form synchronously at the same rate and with the same morphology, ensuring the consistency of the size (pore diameter, pore depth) and distribution of the double-sided micropore structure.

[0049] By precisely maintaining the parallel and equidistant relationship between the current collector 100 and the large-area graphite electrode 222 plate, the entire effective processing area of ​​the current collector 100 is within the uniform region of the approximately infinite parallel plate electric field established by the electrode plate. This weakens the influence of the physical edge of the electrode plate on the electric field of the processing area, and limits the edge effect to a minimum. As a result, the micro-hole processing of the current collector 100 is uniform and stable in both the width and length directions, avoiding local over-corrosion or under-processing.

[0050] In this disclosure, the graphite electrode 222 is tunably positioned within the electrolytic cell 221. In electrolytic machining, the distance between the electrode and the workpiece (current collector 100) is a crucial parameter determining the electric field strength and current distribution. Therefore, by adjusting the position of the graphite electrode 222 to change the electrode spacing between it and the current collector 100, the operator or control equipment can directly and linearly adjust the current density acting on the surface of the current collector 100. This eliminates the need for frequent changes to the electrical output parameters of the power supply 4, allowing for flexible setting and stable maintenance of the optimal machining current density within a wide range. This provides an intuitive and effective means of precisely controlling the dissolution rate, final pore size, and depth-to-diameter ratio of the micropores, and re-establishes an optimal parallel and equidistant machining environment for current collectors 100 of different thicknesses.

[0051] In order to make the position of the graphite electrode 222 adjustable in the electrolytic cell 221, the electrode spacing between it and the current collector 100 is controlled by a fine-tuning mechanism. Specifically, the fine-tuning mechanism can adopt the following mechanical structure.

[0052] In one embodiment, the position of the graphite electrode 222 is adjusted by a lead screw and slide adjustment mechanism. Specifically, a precision lead screw and slide module is provided for each graphite electrode 222 outside the electrolytic cell 221. This module includes a base, a ball screw, a drive nut, and a linear guide rail for guidance. The graphite electrode 222 is connected to the slide of the lead screw and slide via an insulated and corrosion-resistant support rod (such as a metal rod coated with a plastic layer). Rotating the adjustment handwheel at one end of the lead screw (or driving it via a stepper motor) drives the slide, along with the graphite electrode 222, to move precisely in a direction perpendicular to the plane of the current collector 100. The support rod extends into the cell through a dynamic sealing sleeve (such as a linear bearing with an O-ring seal) installed on the side wall of the electrolytic cell 221, ensuring smooth electrode movement and preventing electrolyte 224 leakage. The entire lead screw and slide module is mounted on a rigid bracket 61 outside the electrolytic cell 221.

[0053] In another embodiment, an eccentric wheel or cam-driven adjustment mechanism adjusts the position of the graphite electrode 222. Specifically, one or more eccentric wheels or cams are provided on the back (outside the groove) of the graphite electrode 222, and these wheels are mounted on a rotatable adjustment shaft. The support structure (such as a back plate) of the graphite electrode 222 contacts the working surface of the eccentric wheel. When the adjustment shaft is rotated, the change in the profile of the eccentric wheel is converted into a pushing force or release on the electrode support structure, thereby pushing the electrode as a whole closer to or away from the current collector 100. At the same time, a matching compression spring is provided, which provides a restoring force for the electrode away from the current collector 100, balancing the pushing force of the eccentric wheel, making the adjustment smoother. A positioning pin hole can be set on the adjustment shaft or a bushing with a locking handle can be used to facilitate locking at the set position.

[0054] In this regard, those skilled in the art can flexibly configure the structure of the lifting and traversing mechanism 213 according to the technical concept of this disclosure, and this disclosure does not limit it.

[0055] During operation, the positive terminal of the external power supply 4 is connected to the upper and lower graphite plates, and the negative terminal is connected to the conductive rollers. The current collector 100 in the electrolyte 224 is parallel to the upper and lower graphite plates, with equal spacing L between them. The upper and lower graphite plates are required to be able to move up and down to facilitate adjustment of the spacing L according to the current density. The left and right conductive rollers are required to be able to make fine adjustments up, down, left, and right to ensure the parallelism of the current collector 100. The pH meter mainly tests the pH value of the electrolyte 224 system to facilitate observation of the stability of the solution system. The discharge port 225 is mainly for the discharge of electrolyte 224.

[0056] Relationships within the electrolysis system: Instantaneous effective area during electrolysis: Current density: Electrolyte ohmic resistance: Where J is the current density; I is the electrolysis current; w / W is the width of the graphite plate / current collector 100; X is the length of the graphite plate; T is the electrolysis reaction time at a certain position of the current collector 100; V is the operating speed of the current collector 100; R is the resistance of the electrolyte 224; L is the distance between the electrode and the current collector 100 (resistance is positively correlated with distance and negatively correlated with effective area); the width of the graphite plate w: determines the effective width of electrolysis, affecting the current density distribution and the utilization rate of the current collector 100; the length of the graphite plate x: determines the reaction time of the current collector 100 in the electrolysis zone (t=x / V), affecting the pore depth and porosity; graphite Plate thickness h2: Affects the conductivity / heat dissipation performance of the electrode, avoiding local overheating that could lead to electrolyte decomposition or electrode wear; Current collector 100 width W: Matches the graphite plate width w, affecting the effective electrolysis area and edge effect; Conductive roller spacing X: Ensures the flatness of the current collector 100 in the electrolysis zone, avoiding wrinkles or poor contact; Hole structure (pore diameter, pore depth) is determined by the current density J and the reaction time t (t=x / V, where x is the length of the graphite plate and V is the current collector velocity), and the current density J is positively correlated with the pore diameter (for every 50A / m² increase in J, the pore diameter increases by 0.8~1.0μm).

[0057] This technical solution employs a salt-based organic electrolyte system, for example: electrolytic micro-shaped aluminum foil: solutes: aluminum hexafluorophosphate, aluminum trimethylsulfonate, aluminum tetrafluoroborate; solvent combinations: ethylene carbonate (EC) + dimethyl carbonate (DMC), EC + ethyl methyl carbonate (EMC), EC + diethyl carbonate (DEC); anode: Al ⁻3e - →Al 3+ EC+2e - +2H + →HOCH2CH2OCOO -+CH3OH; Cathode: 2PF6 - +6e - →2PF3↑+6F - 2BF4 - +6e - →2BF3↑+6F - 2CH3SO3 - +8e - +8H + →2CH4↑+2SO3 2- +2H2O; Electrolytic micro-molded copper foil: copper sulfate (CuSO4) 5H2O), sulfuric acid (H2SO4), chloride ions (Cl) - (from hydrochloric acid), citric acid (C6H8O7); anode: Cu ⁻2e - →Cu 2+ Cu ⁻e - +2Cl - →CuCl2 - Cathode: [Cu(C6H5O7)] - +2e - →Cu↓+C6H5O7 3- 2H + +2e - →H2↑.

[0058] In one embodiment of this disclosure, the battery current collector surface micropore processing equipment further includes an electrolyte 224 circulation supply device connected to the electrolytic cell 221. During continuous production, the effective components of the electrolyte 224 are consumed due to continuous reaction, and reaction products may accumulate, leading to a gradual deterioration of the electrolyte 224's performance and consequently causing instability in the micropore processing rate and morphology. The electrolyte 224 circulation supply device continuously extracts the electrolyte 224 from the electrolytic cell 221, filters, replenishes, and adjusts it before pumping it back into the cell, establishing a dynamic circulation. This effectively avoids localized uneven concentrations or component stratification within the cell, ensuring that the current collector 100, regardless of the time or location at which it enters the electrolysis zone, always encounters electrolyte 224 with consistent and stable chemical activity, thus helping to obtain a micropore array with highly uniform pore size and depth.

[0059] In one possible design, a controller and a pH detector 5 are also included. The pH detector 5 is used to detect the pH value of the electrolyte 224 in the electrolyzer 221. The controller is communicatively connected to the pH detector 5 and is configured to control the operation of the electrolyte 224 circulation supply device at least according to the pH value. The pH value is a key indicator for measuring the acid-base balance and stability of the active components in the electrolyte 224. Its fluctuations are directly related to the electrolysis reaction rate, the degree of side reactions, and the final micropore morphology. By introducing the pH detector 5 for real-time online monitoring, the equipment can continuously and accurately obtain the actual chemical state of the electrolyte 224, breaking the traditional lagging management mode that relies on offline sampling, experience judgment, or fixed-time maintenance. This ensures that the chemical environment of the electrolyte 224 is always within the preset optimal process window.

[0060] Furthermore, precise control based on real-time pH data avoids the waste of electrolyte 224 caused by periodic replacement or blind replenishment with large flow rates. Only when necessary, precise replenishment or adjustment is made as needed, maximizing the utilization rate of electrolyte 224 and extending its effective service life. This not only reduces the consumption cost of expensive chemical raw materials but also reduces the amount of waste liquid and related environmental costs.

[0061] In one embodiment, the cleaning unit 231 of the post-processing device 23 is an ultrasonic cleaning tank. The ultrasonic cleaning tank utilizes the cavitation effect generated by ultrasound in the cleaning fluid, causing the generated high-frequency pressure waves to form countless tiny bubbles in the liquid, which then burst instantly, generating extremely strong local impact force and micro-jet. This force can penetrate into the micropores and minute corners of the current collector 100 surface, powerfully peeling away and washing away electrolyte 224 residues, reaction byproducts, and tiny particles that are difficult to reach through mechanical scrubbing or conventional soaking. This process is purely physical, avoiding the potential corrosive damage to the metal foil substrate and fine structure caused by strong chemical cleaning, thus ensuring the physical integrity of the current collector 100 while achieving deep cleaning.

[0062] In one specific design, the cleaning unit 231 preferably adopts a dual-tank series ultrasonic cleaning design. The tank body is made of corrosion-resistant 316L stainless steel, and its bottom is equipped with an inclined guide plate with an inclination angle of approximately 15° to facilitate the settling and collection of impurity particles generated during the cleaning process.

[0063] The tank is equipped with dual-frequency ultrasonic transducers of 28kHz and 40kHz, with a power density of 50W / L. When the current collector 100 exits from the microporous electrolysis device 22 and enters the cleaning unit 231, the ultrasonic transducers activate, generating a strong cavitation effect in the cleaning fluid. This effect produces bubbles with diameters on the order of tens of micrometers; these bubbles, upon instantaneous collapse, can generate localized impact forces reaching thousands of atmospheres. This high-energy microjets and shock waves effectively penetrate and act on the micropores and complex morphological regions of the current collector 100 surface, powerfully stripping away electrolyte residues 224 and tiny impurity particles adhering to it, thoroughly destroying the adsorption of contaminants on the substrate surface, thereby achieving deep and efficient cleaning treatment.

[0064] In one embodiment, the drying unit 232 of the post-processing device 23 includes a hot air drying section and an infrared drying section. The drying unit 232 adopts a combination of the hot air drying section and the infrared drying section, forming a scientific drying logic. First, the hot air drying section uses flowing low-temperature hot air to quickly remove a large amount of free moisture from the surface of the current collector 100 and the micropore openings, completing the initial and gentle pre-drying, preventing the moisture from generating a vapor lock effect due to rapid vaporization in the subsequent high-temperature stage, which would damage the microporous structure. Subsequently, the infrared drying section utilizes the penetrating and selective heating characteristics of infrared radiation, whose energy can be efficiently absorbed by water molecules, thereby directly and uniformly heating the entire current collector 100 and the residual moisture inside the micropores, achieving deep drying. This removes moisture while avoiding thermal deformation or degradation of mechanical properties of the foil due to excessively high overall temperature or uneven heating.

[0065] In this disclosure, the hot air drying section adopts a closed-loop hot air circulation design, with a built-in high-efficiency heater (heating power 3-5kW) and centrifugal fan (wind speed 2-3m / s). A flow equalization plate is set at the hot air outlet to ensure that the hot air is evenly distributed on the surface of the collector 100. After cleaning, a thin water film is attached to the surface of the collector 100. The hot air pre-drying unit 232 continuously blows dry hot air at 40-60℃ to quickly evaporate most of the free water on the surface, avoiding the generation of steam lock in the micropores due to excessive moisture during subsequent infrared heating.

[0066] Furthermore, a high-precision humidity sensor (measurement accuracy ±2%RH) is installed at the outlet of the hot air drying unit 232 to monitor the surface humidity of the collector 100 in real time. When the humidity is higher than 5%RH, the power of the infrared heating tube is automatically increased or the operating speed of the collector 100 is reduced to ensure that the moisture content of the collector 100 after drying is ≤0.1%.

[0067] To achieve accurate control of the surface temperature of the current collector 100, a cooling mechanism is also provided. This cooling mechanism blows room temperature air onto the dried surface of the current collector 100 using a miniature fan, reducing the temperature of the current collector 100 to room temperature (≤30℃) before sending it into the winding unit 3. This prevents the high-temperature current collector 100 from wrinkling due to thermal expansion and contraction during winding, and also prevents heat accumulation after winding from affecting the performance of the current collector 100.

[0068] The close combination of ultrasonic cleaning and combined drying helps to keep the surface of the current collector 100 clean after electrolytic processing, and there is no residual electrolyte crystallization (salting out) or moisture inside the micro-channels of the current collector 100. This can significantly improve the quality of the current collector 100 and provide a reliable electrode substrate material guarantee for the preparation of batteries with high safety and long cycle life.

[0069] In one embodiment of this disclosure, the current collector 100 processed by the battery current collector surface micropore processing equipment is a metal foil with a microstructure on its surface, so that the micropores to be processed subsequently are located at the top of the microstructure. The microstructure itself significantly increases the substrate surface area, enhancing the anchoring effect with the active material. The micropores located at its top further provide a vertical fast channel for electrolyte 224 wetting and lithium ion migration. The two work together to enable the current collector 100 processed by the equipment provided in this disclosure to simultaneously achieve extremely high active material loading, excellent interfacial bonding strength, and excellent ion transport efficiency, thereby giving the battery higher energy density, better rate performance, and longer cycle life.

[0070] Specifically, the metal foil is either copper or aluminum foil. Both copper and aluminum foils are soft and easily deformable, especially for ultra-thin foils used in high-performance batteries, with thicknesses as low as 6-8 μm. By integrating tension control, precision guidance, and non-contact or low-stress processing techniques (such as plasma treatment and electrolytic machining), it is possible to achieve stable and continuous processing of high-precision microporous structures on these ultra-thin and flexible micro-shaped foils without causing material wrinkles, tensile deformation, or mechanical damage.

[0071] In one embodiment of this disclosure, a tension control roller assembly for tensioning the current collector 100 is further provided between the unwinding unit 1 and the winding unit 3. The current collector 100 is an extremely thin metal foil (e.g., 6-12 μm), which is highly susceptible to wrinkling, swaying, or localized stretching due to tension fluctuations during continuous high-speed conveyor belt operation. Through real-time monitoring and feedback adjustment, the tension control roller assembly can maintain the tension of the current collector 100 within an optimal range throughout the entire production path, ensuring that the current collector 100 remains flat and stable in position when entering the plasma treatment zone, electrolytic cell 221, and drying zone. For plasma treatment, the flat surface ensures uniform processing distance; for electrolytic processing, stable tension prevents the current collector 100 from fluctuating vertically or shifting laterally relative to the graphite electrode 222, thereby ensuring a constant electrode spacing and uniform electric field distribution.

[0072] In this disclosure, the tension control roller assembly includes a tension detector, a controller, and a tension adjustment unit with a tension adjustment actuator. Tension sensors, such as floating roller tension sensors (which calculate tension by detecting the displacement of the floating roller) or strain gauge tension sensors directly mounted on the bearing housing of guide roller 62, are installed at key locations along the conveyor path (e.g., after unwinding, before rewinding, or at the entrance of processing unit 2). The adjustment unit includes variable-speed driven unwinding and rewinding motors, and one or more floating rollers along the path. The floating rollers are mounted on linear guides, and their positions can fluctuate with changes in tension. The controller is configured as a PLC programmable logic controller or a dedicated tension controller.

[0073] During operation, the tension sensor transmits the detected tension signal to the controller in real time. The controller compares this signal with the preset tension setpoint and, based on the deviation, adjusts the speed or torque of the unwinding motor (as a brake) and / or the winding motor (as a drive) in real time using algorithms such as PID control. The floating roller acts as a mechanical buffer, absorbing instantaneous speed differences, and its position signal is often used as auxiliary feedback for control, thus forming a closed-loop control device that dynamically maintains constant tension.

[0074] In one embodiment of this disclosure, the current collector 100 is disposed on the support device 6, which includes a bracket 61 and guide rollers 62. The guide rollers 62 are configured in two sets spaced apart and rotatably disposed on the bracket 61. The tops of the two sets of guide rollers 62 together form a support portion of the current collector 100. At least one set of guide rollers 62 is drivenly connected to a driver to drive the current collector 100 to move along a preset direction.

[0075] The current collector 100 is an extremely thin metal foil, which is prone to sagging, shaking, or wrinkling during high-speed transport. The carrying device 6, through the tops of two sets of guide rollers 62, forms a defined support plane, ensuring that the current collector 100 remains taut and flat as it passes through key processing areas (such as the plasma treatment zone and electrolytic cell 221). The rotatable design of the guide rollers 62 greatly reduces sliding friction with the current collector 100, preventing surface scratches and ensuring uniform traction force, thus guaranteeing efficient and continuous subsequent processing steps.

[0076] At least one set of guide rollers 62 is connected to a driver (such as a servo motor), enabling the device to actively and precisely programmatically control the transmission speed of the current collector 100. This differs from passive traction that relies solely on the tension difference between unwinding and rewinding. In electrolytic machining, the depth of the micro-holes directly depends on the time it takes for the current collector 100 to pass through the electric field region. The actively driven guide rollers 62 ensure a constant belt speed that closely matches the set value, fundamentally guaranteeing the accuracy of the reaction time and enabling reliable control of the micro-hole depth.

[0077] In this disclosure, both the unwinding unit 1 and the winding unit 3 are prior art, and therefore will not be described in detail here. Those skilled in the art, based on the technical concept of this disclosure, can choose any suitable unwinding unit 1. Furthermore, the unwinding unit 1 and the winding unit 3 can be configured as units with the same components or as units with different components; this disclosure does not impose any restrictions in this regard.

[0078] Example 1: Raw materials: Micro-shaped aluminum foil (see Figure 4): 600*0.012mm, micro-shaped protrusion diameter 30μm, height 10μm; NH3 reducing gas plasma is used, the distance between the plasma processor and the current collector surface is 5mm, the movement speed along track 1 is 8m / min, the vertical adjustment accuracy of track 2 is ±0.1mm, the processing power is 300W, and the processing time is 6s / min. 2Graphite plate parameters: width 600mm, length 500mm, thickness 2.5mm; electrode spacing L=8mm, conductive roller spacing 600mm, current collector running speed 10m / min (reaction time t=x / V=500mm÷10m / min=3s); electrolyte system: solute is 0.8mol / L aluminum hexafluorophosphate, solvent is ethylene carbonate (EC) + dimethyl carbonate (DMC) (volume ratio 1:1), electrolyte temperature is controlled at 28±2℃, pH value is maintained at 4.5-5.5 (monitored in real time by pH meter); power supply parameters: external... Connect to an adjustable DC power supply, current density J = 300A / m², electrolysis current I = J × S = 300A / m² × (2 × 0.6m × 0.5m) = 180A (S is the effective area of ​​double-sided electrolysis); Cleaning unit: frequency 28kHz (removing residual electrolyte in micropores), water temperature in the tank 30℃, cleaning time 15s / m², guide plate tilt angle 15°; Drying unit: hot air drying temperature 50℃, wind speed 2.5m / s; humidity sensor monitoring threshold 5%RH, when humidity exceeds the standard; cooling module outlet air temperature 25℃, current collector winding temperature ≤30℃.

[0079] Processing results and performance verification Example 2 Materials: Micro-shaped copper foil: 600*0.008mm, micro-shaped protrusion diameter 20μm, height 8μm; H2 reducing gas plasma is used, the distance between the plasma processor and the current collector surface is 4mm, the movement speed is 12m / min, the processing power is 250W, to avoid damage to the thin foil; Graphite plate parameters: width 600mm, length 400mm, thickness 2.5mm; electrode spacing L=6mm, conductive roller spacing 500mm, current collector running speed 12m / min (reaction time t=400mm÷12m / min=2s); Electrolyte system: copper sulfate (CuSO4) Electrolyte composition: 0.5 mol / L H₂O + 0.2 mol / L sulfuric acid (H₂SO₄) + 0.1 mol / L citric acid + 50 mg / L chloride ions (provided by hydrochloric acid); electrolyte temperature: 25±2℃; pH: 3.0-3.5; power supply parameters: current density J = 250 A / m², electrolysis current I = 250 A / m² × (2 × 0.6 m × 0.4 m) = 120 A; cleaning unit: dual-tank ultrasonic cleaning frequency 28 kHz / 40 kHz, water temperature 28℃, cleaning time 10 s / m 2 Drying unit: hot air pre-drying temperature 45℃, wind speed 2m / s; humidity sensor monitoring threshold 4%RH, current collector winding moisture content ≤0.08%.

[0080] Processing results and performance verification Example 3 Materials: Micro-shaped copper foil: 600*0.010mm, micro-shaped protrusion diameter 40μm, height 6μm; NH3+H2 mixed reducing gas (volume ratio 2:1), plasma processor distance from current collector surface 6mm, movement speed 8m / min, processing power 350W, to enhance oxide layer removal effect; Graphite plate parameters: width 600mm, length 400mm, thickness 2.5mm; electrode spacing L=10mm, conductive roller spacing 700mm, current collector running speed 8m / min (reaction time t=600mm÷8m / min=4.5s); Electrolyte system: solute is 0.6mol / L aluminum tetrafluoroborate, solvent is ethylene carbonate (EC) + diethyl carbonate (DEC) (volume ratio 1:1), electrolyte circulation rate 5L / min (maintaining uniform concentration through circulation equipment); Power supply parameters: current density J=400A / m 2 Electrolysis current I = 400 A / m 2 × (2 × 0.6m × 0.6m) = 144A; Cleaning unit: Dual-tank ultrasonic cleaning frequency 28kHz / 40kHz, water temperature 28℃, cleaning time 10s / m 2 Drying unit: hot air pre-drying temperature 45℃, wind speed 2m / s; humidity sensor monitoring threshold 4%RH, current collector winding moisture content ≤0.08%.

[0081] Processing results and performance verification By using the adjustable spacing design of graphite plate electrodes and the precise matching of external adjustable power supply and current density, the micropore size can be flexibly controlled within the range of 1-20μm, with a pore size fluctuation error of ≤±1μm, which is far superior to the precision level of existing mechanical processing (±3-5μm) and traditional electrolytic processing (±4μm), thus meeting the requirements of high energy density batteries for fine microstructure.

[0082] By leveraging the coordinated control of graphite plate length and current collector running speed, the quantitative relationship between reaction time and pore depth is clarified, stabilizing the micropore depth-to-diameter ratio at 1:1-1:3 and the porosity fluctuation range at ≤±2%. Combined with electrolyte circulation and real-time pH monitoring, micropore blockage or depth deviation caused by insufficient electrolyte stability is avoided, thus solving the core problems of "uneven pore size and uncontrolled depth" in traditional electrolytic processing.

[0083] Plasma pretreatment thoroughly removes the oxide layer on the current collector surface (residual rate ≤0.05%), avoiding interference from the oxide layer on the electrolytic reaction; the graphite plate electrode is free from dissolution contamination, the cleanliness of the electrolyte is significantly improved, and there are no impurities adhering to the micropore surface. The synergistic effect of dual-frequency ultrasonic cleaning and closed-loop drying units effectively removes electrolyte residue (residual amount ≤0.5mg / m²), eliminates salting-out, and leaves the current collector surface free of burrs, slag, and substrate damage, solving the pain points of burr risks from machining, oxide layer residue from laser processing, and irregular edges from chemical etching.

[0084] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for processing micropores on the surface of a battery current collector, comprising an unwinding unit, a processing unit, and a rewinding unit arranged sequentially along a processing path, characterized in that, The processing unit includes: a surface pretreatment device for plasma treatment of the current collector surface; a micropore electrolysis device located downstream of the surface pretreatment device for electrolytic processing of the plasma-treated current collector to form micropores; and a post-processing device located downstream of the micropore electrolysis device for cleaning and drying the electrolytically processed current collector.

2. The battery current collector surface micropore processing equipment according to claim 1, characterized in that, The surface pretreatment device includes a plasma generator and an adjustment mechanism. The plasma generator is disposed on at least one side of the current collector conveyor path and is installed on the moving end of the adjustment mechanism.

3. The battery current collector surface micropore processing equipment according to claim 2, characterized in that, The adjustment mechanism includes a gantry frame and a lifting and traversing mechanism mounted on the gantry frame, and the plasma generator is connected to the movable end of the lifting and traversing mechanism.

4. The battery current collector surface micropore processing equipment according to claim 1, characterized in that, The microporous electrolysis device includes an electrolytic cell, at least one pair of graphite electrodes located within the electrolytic cell, and a conductive roller assembly for conveying and electrically connecting a current collector. The graphite electrodes are connected to the positive terminal of a power source, and the conductive roller assembly is connected to the negative terminal of the power source.

5. The battery current collector surface micropore processing equipment according to claim 4, characterized in that, In the microporous electrolysis device, the current collector passes between a pair of graphite electrodes and is parallel to and equidistant from the graphite electrodes on both sides; and the graphite electrodes are arbitrarily positioned in the electrolytic cell.

6. The battery current collector surface micropore processing equipment according to claim 4, characterized in that, The battery current collector surface micropore processing equipment also includes an electrolyte circulation supply device, which is connected to the electrolytic cell.

7. The battery current collector surface micropore processing equipment according to claim 4, characterized in that, The battery current collector surface micropore processing equipment also includes a controller and a pH detector. The pH detector is used to detect the pH value of the electrolyte in the electrolytic cell. The controller is communicatively connected to the pH detector and is configured to control the operating status of the electrolyte circulation supply device at least according to the pH value.

8. The battery current collector surface micropore processing equipment according to claim 1, characterized in that, The cleaning unit of the post-treatment device is an ultrasonic cleaning tank; and / or, the drying unit of the post-treatment device includes a hot air drying section and an infrared drying section.

9. The battery current collector surface micropore processing equipment according to any one of claims 1-8, characterized in that, The current collector processed by this battery current collector surface micropore processing equipment is a metal foil with a micro-structure on its surface.

10. The battery current collector surface micropore processing equipment according to any one of claims 1-8, characterized in that, A tension control roller group for tensioning the current collector is also provided between the unwinding unit and the winding unit.

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