Pole piece micro-processing device

Abstract

The utility model relates to the technical field of battery pole pieces, in particular to a pole piece micro-processing device, which is used for forming dents arranged in an array on the surface of a pole piece and comprises a feeding sucker, a micro-processing table and a pressurizing device, a negative pressure cavity I is formed in the feeding suction cup, and a plurality of through holes I are formed in the bottom surface of the feeding suction cup; the micro-processing table comprises a micro-processing table body, a negative pressure cavity II is formed in the micro-processing table body, a plurality of protruding units are distributed on the upper surface of the micro-processing table body in an array mode, through holes II are formed in the protruding units, a negative pressure pipeline is further arranged on the micro-processing table body, and a negative pressure connector II is formed in the negative pressure pipeline; the feeding suction cup presses the upper surface of the micro-processing table body under the action of the pressurizing device, and dents are formed in the surface of the pole piece. The electrode plate is simple in structure, scientific in design and high in mark making efficiency, and the electrode plate capable of improving the electrolyte retention capacity, increasing the reaction contact area and improving the rate capability of a battery can be obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pole pieces, in particular to a pole piece microprocessor. Background Art

[0002] Laminated battery cells are widely used due to their advantages such as high rate and high energy density. Existing technology uses laser marking technology to micro-process the electrode sheets of laminated battery cells, forming a large number of micron-sized pores on their surfaces. The presence of micron-sized pores helps increase the electrode's liquid retention capacity, increases the reaction contact area, and further improves the battery's rate performance. However, this marking technology not only easily causes laser ablation of the active material on the electrode surface, creating a heat-affected zone, but also may damage the foil, making the electrode quality questionable. The prior art also uses vibration marking. For example, Chinese invention patent application No. 202210529134.7 proposes a marking device, an electrode production system, and an electrode marking method. The marking device includes a marking mechanism and a vibrating mechanism. The marking mechanism is arranged on the side of the electrode having the active material layer along the thickness direction of the electrode. The vibrating mechanism is connected to the marking mechanism and is used to drive the marking mechanism to vibrate along the thickness direction of the electrode, so that the marking mechanism squeezes the surface of the electrode during rotation to form a mark on the electrode. The vibration mechanism drives the marking mechanism to vibrate along the thickness direction of the electrode, so that the marking mechanism squeezes the surface of the electrode during rotation to form a mark on the electrode surface, thereby improving the quality of the electrode. This method does not have a thermal impact on the active material on the electrode surface, but it is very likely to have an adverse effect on the overall compactness of the electrode. In addition, although this prior art is provided with a dust removal device, the dust removal device is arranged downstream of the marking device, which requires power transmission and cannot avoid the spread of dust during transmission.

[0003] For this purpose, this application is filed. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the utility model provides a pole piece microprocessing device.

[0005] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0006] A pole piece micro-processing device is used to micro-process the surface of the pole piece and form array-arranged indentations thereon, comprising: a loading suction cup, a micro-processing platform and a pressurizing device;

[0007] A negative pressure cavity I is provided inside the loading suction cup, and a plurality of through holes I communicating with the negative pressure cavity I are provided on the bottom surface of the loading suction cup;

[0008] The micro-processing station includes a micro-processing station body, the interior of which is provided with a negative pressure chamber II. The upper surface of the micro-processing station body is provided with a plurality of protruding units arranged in an array. The protruding units are provided with through holes II communicating with the negative pressure chamber II. The micro-processing station body is also provided with a negative pressure pipeline communicating with the negative pressure chamber II, and the negative pressure pipeline is provided with a negative pressure interface II.

[0009] The bottom surface of the loading suction cup is arranged opposite to the upper surface of the micro-processing table body. The loading suction cup is connected to the pressure device. The loading suction cup presses the upper surface of the micro-processing table body under the action of the pressure device.

[0010] Preferably, the protruding units include spheres, cylinders, cones and terraces.

[0011] More preferably, the protruding unit is selected from any one or more of a hemispherical shape, a spherical shape, a triangular pyramid, a quadrangular pyramid, a pentagonal pyramid, a hexagonal pyramid, a triangular prism, a quadrangular prism, a pentagonal prism, and a hexagonal prism.

[0012] More preferably, the protruding unit is hemispherical with a diameter of 5-10 μm and a height of 2-5 μm, and the distance between two adjacent protruding units is 2-5 mm.

[0013] Further preferably, the through hole II is vertically arranged and located in the middle of the protruding unit, and the negative pressure pipeline is vertically arranged at the lower part of the micro-processing station body and communicated with the middle of the negative pressure chamber II.

[0014] Further preferably, the loading suction cup includes a loading suction cup body I and a loading suction cup body II, which are integrated and in an inverted "T" shape, the negative pressure chamber I is located in the loading suction cup body II, and the through hole I is distributed on the bottom surface of the loading suction cup body II. The loading suction cup body I is connected to the pressurizing device and a negative pressure pipeline is arranged inside, and a negative pressure interface I is arranged on the negative pressure pipeline.

[0015] Further preferably, a plurality of through holes I are arranged in an array on the bottom surface of the loading suction cup body II.

[0016] Further preferably, the pressurizing device includes: a cylinder and a servo motor, and a pressure sensor is provided on the bottom surface of the loading suction cup.

[0017] Further preferably, the bottom surface of the loading suction cup body II corresponds to the upper surface of the micro-processing platform body and both are larger than the surface of the electrode.

[0018] Further preferably, two vacuum pumps are included, one of the vacuum pumps is connected to the negative pressure interface I, and the other vacuum pump is connected to the negative pressure interface II.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] 1. The indentation formed on the electrode by the utility model will neither cause thermal impact on the active material on the surface of the electrode, nor damage the foil, nor have an adverse effect on the compaction of the entire electrode;

[0021] 2. It has a built-in dust collection function, which can remove dust while micro-processing. The dust generated during the micro-processing of the electrode can be collected promptly and effectively, which can prevent dust from contaminating the electrode and causing short circuit or self-discharge in the battery, without causing pollution to the environment, and without the need for power transmission;

[0022] 3. Simple structure, scientific design and high traceability can help to obtain high-performance pole pieces. The pole pieces can not only increase the electrolyte retention capacity and increase the reaction contact area, but also help to improve the battery rate performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 It is a structural diagram of the utility model;

[0025] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at A in the middle;

[0026] Figure 3 for Figure 1 Schematic diagram of the bottom surface of the middle loading suction cup body II;

[0027] Figure 4 for Figure 1 A schematic diagram of the structure of the upper surface of the micro-processing station body;

[0028] Figure 5 It is a structural diagram of the electrode after being processed by the utility model.

[0029] In the figure: 1. Loading suction cup; 11. Loading suction cup body I; 111. Negative pressure interface I; 12. Loading suction cup body II; 121. Negative pressure cavity I; 122. Through hole I; 2. Micro-processing station; 21. Micro-processing station body; 22. Negative pressure cavity II; 23. Negative pressure interface II; 24. Through hole II; 25. Protruding unit; 3. Pole piece; 31. Indentation. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, and are not all embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] The structures not described in detail in the following embodiments are all prior art, and the directional terms such as "upper surface", "lower surface", "bottom surface" etc. used to clearly describe the component structure are only used to describe their relative position relationship and are not used to limit the scope of protection of the present utility model.

[0032] like Figures 1-4 As shown in common: The utility model proposes a pole piece micro-processing device for micro-processing the surface of a pole piece 3 and forming an array of indentations 31 thereon, comprising: a loading suction cup 1, a micro-processing platform 2 and a pressurizing device;

[0033] A negative pressure chamber I 121 is provided inside the loading suction cup 1, and a plurality of through holes I 122 communicating with the negative pressure chamber I 121 are provided on the bottom surface of the loading suction cup 1;

[0034] The micro-processing station 2 includes a micro-processing station body 21, which has a negative pressure chamber II 22 disposed therein. A plurality of protrusions 25 are arranged in an array on the upper surface of the micro-processing station body 21. Each protrusion 25 has a through hole II 24 formed therein, which communicates with the negative pressure chamber II 22. A negative pressure line is also formed on the micro-processing station body 21, communicating with the negative pressure chamber II 22. A negative pressure interface II 23 is provided on the negative pressure line.

[0035] The bottom surface of the loading suction cup 1 is arranged opposite to the upper surface of the micro-processing platform body 21. The loading suction cup 1 is connected to the pressurizing device. The loading suction cup 1 presses the upper surface of the micro-processing platform body 21 under the action of the pressurizing device.

[0036] Working Principle: Microprocessor 2 is fixed in position. Loading suction cup 1 uses negative pressure to attract the electrode to be processed. Then, under the action of the pressurizing device, loading suction cup 1 moves vertically downward and presses against the upper surface of microprocessor body 21. The contact surface between the electrode to be processed and microprocessor body 21 forms a number of indentations 31 corresponding to the position and structure of protrusions 25. During this process, dust generated at the formation of indentations 31 enters negative pressure chamber Ⅱ 22 through through hole Ⅱ 24, where it is collected and subsequently processed, such as being discharged from negative pressure chamber Ⅱ 22 and collected by the dust collection mechanism.

[0037] It should be noted that:

[0038] 1. The pressurizing device includes existing technologies such as hydraulic drive mechanisms (such as various oil cylinders and oil motors), pneumatic drive mechanisms (such as air cylinders), electric drive mechanisms, and mechanical drive structures (such as cam-connecting rod mechanisms). Considering factors such as pressurization effect, control accuracy, and cost, air cylinders and servo motors are preferred. A pressure sensor is also provided on the bottom surface of the loading suction cup 1. The pressure sensor can accurately detect the pressure applied to the loading suction cup 1 by the pressurizing device in real time to meet the indentation requirements of different electrode materials. The common applied pressure range is 0.5-10 tons, and the optimal pressure value needs to be further confirmed and verified in combination with the indentation process.

[0039] 2. The present invention is preferably further equipped with a pole piece conveying mechanism, through which the pole piece to be processed is conveyed to the bottom of the loading suction cup 1. The loading suction cup 1 first absorbs the pole piece and then moves it to the micro-processing station 2 for micro-processing. As for the pole piece conveying mechanism, any conveying mechanism in the prior art, such as a conveyor belt, can be used. This is not an improvement of the present invention. Those skilled in the art can select and match other necessary functional components as needed.

[0040] 3. Both surfaces of the electrode need to be micro-processed, so the present invention is preferably also equipped with a electrode flipping mechanism. The electrode after single-sided processing by the present invention is first flipped by the electrode flipping mechanism and then re-conveyed to the bottom of the loading suction cup 1 by the electrode conveying mechanism. The loading suction cup 1 first absorbs the electrode and then moves it to the micro-processing table 2 for micro-processing. As for the electrode flipping mechanism, any flipping mechanism in the prior art can be used. This is not an improvement of the present invention. Those skilled in the art can select and match other necessary functional components as needed. As a preferred technical solution, in another embodiment of the present invention, the protruding unit 25 includes a sphere, a cylinder, a cone and a table.

[0041] On the basis of the previous embodiment, the protruding unit 25 is specifically selected from any one or more of a hemispherical shape, a spherical shape, a triangular prism, a quadrangular prism, a pentagonal prism, and a hexagonal prism.

[0042] It is worth noting that: for the above structures involving sharp corners, it is preferred to use rounded corner transitions to avoid damage to the foil during micro-processing.

[0043] Based on the previous embodiment, the protruding units 25 are preferably hemispherical with a diameter of 5-10 μm and a height of 2-5 μm, and the distance between two adjacent protruding units 25 is 2-5 mm.

[0044] The present invention has been verified through numerous tests that the protruding unit 25 is preferably a hemispherical structure. This is mainly based on the following reasons:

[0045] (1) The hemispherical structure is not easy to cause damage to the foil. Even if the pressure applied by the pressurizing device is slightly too large, it will not have a significant adverse effect on the foil.

[0046] (2) Figure 5 As shown: after pressurization, a hemispherical indentation 31 is formed on the surface of the pole piece 3, which has at least the following beneficial effects:

[0047] It helps to improve the liquid retention capacity. On the one hand, the surface area of ​​the electrode can be increased without significantly increasing the total volume of the electrode. This increase in surface area helps to provide more space to store electrolyte, thereby improving the liquid retention capacity of the electrode. On the other hand, the indentation helps to improve the distribution of electrolyte on the surface of the electrode, so that the electrolyte can be more evenly covered on the surface of the electrode, reducing the risk of local drying up.

[0048] Improve ion transmission efficiency. The hemispherical indentation 31 helps shorten the transmission path of ions in the electrolyte, especially under high-rate charge and discharge conditions, reducing ion transmission resistance and improving the ion transmission efficiency of the battery.

[0049] Enhanced structural stability: Under the above conditions, the formed indentations 31 can enhance the structural stability of the electrode, reduce stress concentration and deformation caused by volume changes during charging and discharging, and thus extend the service life of the battery;

[0050] The presence of the indentation 31 increases the contact area between the electrode and the surrounding environment, thereby helping to dissipate heat, especially in high-power charging and discharging or high-temperature environments, helping to reduce the temperature inside the battery and improve the safety performance of the battery.

[0051] However, the size, depth, and distribution of the indentations need to be scientifically designed to ensure that they do not negatively impact the overall performance of the pole piece 3. Excessively large indentations may reduce the mechanical strength of the pole piece, while excessive indentations may increase manufacturing cost and complexity.

[0052] The present invention has proved through creative work that when the specifications of the protruding units 25 meet the following requirements: diameter 5-10 μm, height 2-5 μm, and distance between two adjacent protruding units 25 is 2-5 mm, the performance of the obtained pole piece 3 is optimal.

[0053] As a preferred technical solution, in another embodiment of the present invention, the through hole II 24 is vertically arranged and located in the middle of the protruding unit 25 , and the negative pressure pipeline is vertically arranged at the lower part of the micro-processing station body 21 and communicates with the middle of the negative pressure chamber II 22 .

[0054] The through hole II 24 is vertically arranged and located in the middle of the protruding unit 25, which can collect the dust generated during micro-processing in a timely and effective manner to prevent the dust from contaminating the electrode and causing a short circuit or large self-discharge in the battery; the negative pressure pipeline is vertically arranged at the lower part of the micro-processing station body 21 and is connected to the middle of the negative pressure chamber II 22, that is, the negative pressure pipeline can provide a relatively uniform negative pressure adsorption force for the through hole II 24 to collect the dust generated by the micro-processing with the highest possible efficiency and high quality.

[0055] As a preferred technical solution, another embodiment of the present invention, the loading suction cup 1 includes an integrated design and an inverted "T"-shaped loading suction cup body Ⅰ11 and a loading suction cup body Ⅱ12, the negative pressure chamber Ⅰ121 is located in the loading suction cup body Ⅱ12, and the through hole Ⅰ122 is distributed on the bottom surface of the loading suction cup body Ⅱ12, the loading suction cup body Ⅰ11 is connected to the pressurizing device and a negative pressure pipeline is arranged inside, and a negative pressure interface Ⅰ111 is provided on the negative pressure pipeline.

[0056] Specifically, the loading suction cup body I11 is located directly above the loading suction cup body II12. The pressure device is preferably connected to the top of the loading suction cup body I11. The pressure applied by the pressure device is evenly distributed to the bottom surface of the loading suction cup body II12 and acts evenly on the surface to be processed of the electrode 3 through the bottom surface of the loading suction cup body II12, ultimately forming relatively uniform indentations 31 on the surface to be processed. If the pressure applied by the pressure device is not evenly applied to the surface to be processed, the indentations 31 formed will be of different sizes, and ultimately, a high-quality electrode 3 cannot be obtained.

[0057] As a preferred technical solution, in another embodiment of the present invention, a plurality of through holes Ⅰ122 are arranged in an array on the bottom surface of the loading suction cup body Ⅱ12, and the specific number and arrangement design can be adjusted according to the material of the electrode.

[0058] In order to ensure the micro-processing effect of the electrode 3, as a preferred technical solution, another embodiment of the present invention is that the bottom surface of the loading suction cup body Ⅱ12 corresponds to the specifications of the upper surface of the micro-processing table body 21, and both are larger than the surface of the electrode 3. In this way, it can be ensured that the electrode to be processed is effectively sucked by the loading suction cup body Ⅱ12 and transferred to the upper surface of the micro-processing table body 21.

[0059] As a preferred technical solution, another embodiment of the present invention further includes two vacuum pumps, one of which is connected to the negative pressure interface I 111 to ensure that the negative pressure chamber I 121 is continuously in a negative pressure state, and the other of which is connected to the negative pressure interface II 23 to ensure that the negative pressure chamber II 22 is continuously in a negative pressure state. As for the models and specifications of the vacuum pumps, they are all existing technologies, and those skilled in the art can flexibly select and adjust them according to actual needs.

[0060] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present invention. A person skilled in the art may make changes, modifications, replacements, and deformations to the above embodiments within the scope of the present invention. For example, two micro-processing stations 2 are arranged relative to each other, and the protrusion units 25 of the two micro-processing stations 2 are mirror images. The loading suction cup 1 is arranged on the side of the micro-processing station 2. The electrode to be processed is first sucked by the loading suction cup 1 and placed between the two micro-processing stations 2. After that, the loading suction cup 1 is withdrawn, and the two groups of protrusion units 25 move relative to each other to act on the two surfaces of the electrode to be processed at the same time, and the indentations on the two surfaces are formed at one time. In addition, unless there is any contradiction, a person skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

Claims

1. A pole piece microprocessing device for microprocessing the surface of a pole piece (3) and forming an array of indentations (31) thereon, characterized in that: include: A loading suction cup (1), a micro-processing table (2) and a pressurizing device; A negative pressure chamber I (121) is provided inside the loading suction cup (1), and a plurality of through holes I (122) communicating with the negative pressure chamber I (121) are provided on the bottom surface of the loading suction cup (1); The micro-processing station (2) includes a micro-processing station body (21), a negative pressure chamber II (22) is provided inside the micro-processing station body (21), a plurality of protrusion units (25) are distributed in an array on the upper surface of the micro-processing station body (21), a through hole II (24) communicating with the negative pressure chamber II (22) is provided on the protrusion unit (25), and a negative pressure pipeline communicating with the negative pressure chamber II (22) is also provided on the micro-processing station body (21), and a negative pressure interface II (23) is provided on the negative pressure pipeline; The bottom surface of the loading suction cup (1) is arranged opposite to the upper surface of the micro-processing platform body (21), and the loading suction cup (1) is connected to the pressure device. The loading suction cup (1) presses the upper surface of the micro-processing platform body (21) under the action of the pressure device.

2. The electrode microprocessor according to claim 1, characterized in that: The protruding unit (25) includes a sphere, a column, a cone and a table.

3. The electrode microprocessor according to claim 2, characterized in that: The protruding unit (25) is selected from any one or more of a hemispherical shape, a spherical shape, a triangular prism, a quadrangular prism, a pentagonal prism, and a hexagonal prism.

4. The electrode microprocessor according to claim 3, characterized in that: The protruding units (25) are hemispherical with a diameter of 5-10 μm and a height of 2-5 μm, and the distance between two adjacent protruding units (25) is 2-5 mm.

5. The electrode microprocessor according to claim 1, characterized in that: The through hole II (24) is vertically arranged and located in the middle of the protruding unit (25), and the negative pressure pipeline is vertically arranged at the lower part of the micro-processing station body (21) and communicated with the middle of the negative pressure chamber II (22).

6. The electrode microprocessor according to claim 1, characterized in that: The loading suction cup (1) comprises an integrated loading suction cup body I (11) and a loading suction cup body II (12) in an inverted T-shape, wherein a negative pressure chamber I (121) is located in the loading suction cup body II (12), and a through hole I (122) is distributed on the bottom surface of the loading suction cup body II (12). The loading suction cup body I (11) is connected to the pressurizing device and is provided with a negative pressure pipeline inside, and a negative pressure interface I (111) is provided on the negative pressure pipeline.

7. The electrode microprocessor according to claim 6, characterized in that: A plurality of through holes I (122) are arranged in an array on the bottom surface of the loading suction cup body II (12).

8. The electrode microprocessor according to claim 1, characterized in that: The pressurizing device comprises: a cylinder and a servo motor, and a pressure sensor is provided on the bottom surface of the loading suction cup (1).

9. The electrode microprocessor device according to any one of claims 1 to 8, characterized in that: The bottom surface of the loading suction cup body II (12) corresponds to the upper surface of the micro-processing platform body (21) and is larger than the surface of the pole piece (3).

10. The electrode microprocessor device according to claim 9, characterized in that: It also includes two vacuum pumps, one of which is connected to the negative pressure interface I (111), and the other is connected to the negative pressure interface II (23).

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