Scraping device and tab slot processing system
By employing a design that combines first and second scraping components with a drive unit in the scraping device, the problem of slurry accumulation on the scraping head is solved, ensuring the consistency of slurry thickness at the edge of the electrode slot and improving the yield and performance of lithium battery electrodes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN HIGHPOWER TECH CO LTD
- Filing Date
- 2025-08-04
- Publication Date
- 2026-07-21
AI Technical Summary
During the production of lithium battery electrodes, residual slurry accumulated on the scraper head increases the slurry thickness at the edge of the electrode slot, affecting the yield and performance of the electrode.
A scraping device is adopted, including a first scraper and a second scraper. Driven by a drive component, the second scraper scrapes off the residual slurry on the first scraper to avoid accumulation and ensure the consistency of slurry thickness at the edge of the tab groove.
It effectively prevents the accumulation of slurry on the scraping device, maintains the consistency of slurry thickness at the edge of the electrode groove, and improves the yield and performance of the electrode sheet.
Smart Images
Figure CN224537063U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of lithium battery manufacturing technology, and in particular to a scraping device and a tab groove processing system. Background Technology
[0002] Lithium-ion batteries are a new generation of high-energy-density clean batteries, possessing numerous advantages such as high voltage, high energy density, good cycle performance, low self-discharge, no memory effect, and a wide operating temperature range. They are widely used in mobile phones, laptops, power tools, and also show promising applications in electric vehicles and large-scale energy storage power stations. The tabs of lithium batteries are typically located in tab slots on the electrode plates. Precisely sized tab slots free of residual material are fundamental to a strong tab weld. A strong tab weld reduces the battery's internal resistance, ensuring the battery achieves its maximum rate performance.
[0003] In related technologies, when producing lithium battery electrodes, a uniform slurry is first extruded from a coating die and coated onto a substrate to form an electrode without grooves. When the electrode passes the position of the scraper head, the scraper head moves close to the electrode and presses against the substrate to scrape off the slurry in the corresponding area. At the same time, a diluent is introduced into the scraper head and a vacuum is applied to suck away the scraped slurry. After a groove of a certain length is scraped out, the scraper head moves away from the electrode to complete the processing of the tab groove.
[0004] However, when the aforementioned technologies continuously scrape out tab slots from the conveyed electrode sheets using a scraper head, residual slurry gradually accumulates on the scraper head. This leads to an increase in the thickness of the slurry at the edge of the scraped tab slots, thereby affecting the consistency of the slurry thickness on the electrode sheets and consequently impacting the yield and performance of the electrode sheets. Utility Model Content
[0005] To solve or partially solve the problems existing in the related technologies, this application provides a scraping device and a tab groove processing system, which can prevent residual slurry from accumulating on the scraping device, thereby preventing the slurry thickness at the edge of the tab groove from increasing.
[0006] The first aspect of this application provides a scraping device, comprising: a substrate, a first scraping element, a second scraping element, and a driving component; The first scraper is rotatably connected to the base, and the driving component is disposed on the base and connected to the first scraper. The driving component is used to drive the first scraper to rotate relative to the base. The second scraper is rotatably connected to the substrate. When the first scraper rotates toward the second scraper, it can abut against the second scraper and drive the second scraper to rotate relative to the substrate, so that the second scraper scrapes off the slurry on the first scraper.
[0007] Furthermore, the first scraper has a first scraping end for scraping off the slurry on the electrode sheet, and the second scraper has a second scraping end. When the first scraper rotates toward the second scraper, the second scraping end can abut against the first scraper and slide relative to the first scraper.
[0008] Furthermore, the matrix is provided with a chamber. When the first scraper removes the slurry on the electrode, the second scraper end separates from the first scraper, so that the slurry scraped from the electrode can enter the chamber through the gap between the first scraper end and the second scraper end.
[0009] Furthermore, the substrate is provided with a diluent inlet and a vacuum interface, both of which are connected to the chamber.
[0010] Furthermore, the driving component is disposed at one end of the first scraper, and the driving component includes a driving member and an elastic member. The driving member and the elastic member are disposed opposite to each other on both sides of the first scraper, and the force applied by the driving member to the first scraper is opposite in direction to the force applied by the elastic member to the first scraper.
[0011] Furthermore, the driving component is a cylinder, the elastic component is a compression spring, the driving component is located above the first scraper, and the elastic component is located below the first scraper.
[0012] Furthermore, the second scraper includes a limiting plate and a scraper plate, the limiting plate being connected to the scraper plate, the limiting plate being able to abut against the substrate, and the scraper plate being used to abut against the first scraper.
[0013] Furthermore, the included angle between the limiting plate and the scraper plate is 60°-120°.
[0014] Furthermore, the substrate is provided with a connector, and the connection between the limiting plate and the scraper is rotatably sleeved on the connector.
[0015] A second aspect of this application provides a tab slot processing system, comprising: a vacuum pump, a waste liquid collection tank, a diluent supply device, and a scraping device as described in any one of the above, wherein the waste liquid collection tank and the diluent supply device are both connected to the scraping device, and the vacuum pump is connected to the waste liquid collection tank.
[0016] The technical solution provided in this application may include the following beneficial results: the slurry on the electrode sheet is scraped off by the first scraper to form the tab groove. After the tab groove is scraped off, the drive component drives the first scraper to rotate toward the second scraper, so that the first scraper and the second scraper come into contact. When the first scraper rotates, it drives the second scraper to rotate, so that the second scraper scrapes off the slurry on the first scraper, thereby avoiding the accumulation of residual slurry on the first scraper. In this way, when the first scraper continues to scrape out the next tab groove, the slurry thickness at the edge of the tab groove will not increase.
[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description
[0018] The above and other objects, features and advantages of this application will become more apparent from the following description of exemplary embodiments of this application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components.
[0019] Figure 1 This is a schematic diagram of the electrode structure shown in related technologies; Figure 2 This is a schematic diagram of the coating system shown in related technologies; Figure 3 This is a schematic diagram of the structure of the scraper head shown in the related technology; Figure 4 This is another structural schematic diagram of the scraper head shown in related technologies; Figure 5 This is a schematic diagram of the scraping device shown in the embodiment of this application, wherein the first scraping component and the second scraping component are in a separated state; Figure 6 This is another structural schematic diagram of the scraping device shown in the embodiment of this application, wherein the first scraping member and the second scraping member are in an abutting state; Figure 7 This is a schematic diagram of the electrode slot machining system shown in the embodiments of this application.
[0020] Figure label: 1-Electrode, 11-Empty foil area, 12-Coating area, 13-Slitting line, 14-Electrode tab groove, 2-Coating roller, 3-Coating die head, 4-Scraper suction head, 41-Scraper head, 42-Diluent inlet, 43-Vacuum interface; 5-Scraping device, 51-Base, 511-Cavity, 512-Dilution inlet, 513-Vacuum interface, 52-First scraping component, 521-First scraping end, 53-Second scraping component, 531-Second scraping end, 532-Limiting plate, 533-Scraping plate, 54-Driving component, 541-Driving component, 542-Elastic component, 55-Connecting component; 6-Vacuum pump, 7-Waste liquid collection tank, 8-Vacuum gauge. Detailed Implementation
[0021] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.
[0022] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0023] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0024] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0025] Figure 1This is a schematic diagram of the structure of electrode 1 shown in the related technology; Figure 2 This is a schematic diagram of the coating system shown in related technologies; Figure 3 This is a schematic diagram of the structure of the scraper head 4 shown in the related technology; Figure 4 This is another structural schematic diagram of the scraper head 4 shown in related technologies.
[0026] like Figure 1 As shown, in the related technology, the electrode 1 includes an empty foil area 11, a coating area 12 and an electrode tab slot 14. The substrate of the empty foil area 11 is not coated with slurry, while the substrate of the coating area 12 is coated with slurry. After the electrode 1 is coated and rolled, it is cut at the slitting line 13 to obtain an electrode of a single cell. Figure 1 The electrode 1 shown can be passed through as follows Figure 2 The coating system shown is used to coat the product, such as... Figure 2 As shown, the coating system has a coating roller 2, a coating die 3, a scraper head 4, and a pass roller. During coating, the substrate of the electrode 1 passes through the coating roller 2, and the slurry is squeezed out from the coating die 3 and evenly coated on the substrate that has passed through the coating roller 2, forming an electrode 1 without grooves. When the electrode 1 passes the position of the scraper head 4, the scraper head 4 moves closer to the electrode 1 and presses against the substrate of the electrode 1 to scrape off the slurry. At the same time, diluent is introduced into the scraper head 4 and vacuum is used to suck away the scraped material. After a certain length of groove is scraped out, the scraper head 4 moves away from the electrode 1, completing the scraping out of the tab groove 14.
[0027] like Figure 3 and Figure 4 As shown, in the related technology, the scraper head 4 includes a scraper head 41, a diluent inlet 42, and a vacuum interface 43. The scraper head 41 has an opening of height L1 and a width L3. The function of the scraper head 41 is to press against the substrate when it approaches the electrode 1. As the substrate moves, the slurry at the corresponding position is scraped up by the scraper head 41 and enters the interior of the scraper head 4 through the opening. The diluent inlet 42 is located above the scraper head 41, and its opening diameter is D1. Its function is to send the diluent into the interior of the scraper head 4 to mix with the slurry scraped by the scraper head 41 to form a fluid mixed solution. The vacuum interface 43 is located above the diluent inlet 42, and its opening size is D2. The distance between the lower end of the vacuum interface 43 and the lower end of the diluent inlet 42 is L2. The vacuum interface 43 is connected to a vacuum device through a waste liquid collection tank, and under a certain vacuum degree, the mixed solution of diluent and slurry is discharged from the interior of the scraper head 4 to the waste liquid collection tank.
[0028] However, when the aforementioned related technologies continuously scrape the tab grooves 14 of the conveyed electrode 1 using the scraper head 4, residual slurry will gradually accumulate on the scraper head 41. This will cause the slurry thickness at the end edge of the scraped tab grooves 14 to increase, thereby affecting the consistency of the slurry thickness on the electrode 1, and thus affecting the yield and performance of the electrode 1.
[0029] To address the aforementioned issues, this application provides a scraping device and a tab groove processing system, which can prevent residual slurry from accumulating on the scraping device, thereby preventing the slurry thickness at the edge of the tab groove from increasing.
[0030] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.
[0031] Figure 5 This is a schematic diagram of the scraping device 5 shown in the embodiment of this application, wherein the first scraping member 52 and the second scraping member 53 are in a separated state; Figure 6 This is another structural schematic diagram of the scraping device 5 shown in the embodiment of this application, wherein the first scraping member 52 and the second scraping member 53 are in an abutting state.
[0032] like Figure 5 and Figure 6 As shown, this application embodiment provides a scraping device 5, including a base 51, a first scraping component 52, a second scraping component 53, and a driving component 54.
[0033] A first scraper 52 is rotatably connected to the substrate 51. The first scraper 52 is used to scrape off the slurry on the electrode to form an electrode tab groove. A drive component 54 is disposed on the substrate 51 and connected to the first scraper 52. The drive component 54 is used to drive the first scraper 52 to rotate relative to the substrate 51. A second scraper 53 is rotatably connected to the substrate 51. When the first scraper 52 rotates toward the second scraper 53, it can abut against the second scraper 53 and drive the second scraper 53 to rotate relative to the substrate 51, so that the second scraper 53 scrapes off the slurry on the first scraper 52.
[0034] In the diagram, both the first scraper 52 and the second scraper 53 are located on the lower side of the base 51. Both the first scraper 52 and the second scraper 53 can rotate clockwise and counterclockwise as shown in the diagram. The second scraper 53 is located to the left of the first scraper 52. When scraping out the tab groove, the first scraper 52 and the second scraper 53 are not in contact, and the first scraper 52 and the second scraper 53 are in a position... Figure 5In the separation state shown, the left end of the first scraper 52 contacts the electrode sheet, thereby scraping off the slurry on the electrode sheet. After the first scraper 52 completes scraping out the tab groove, the drive component 54 drives the first scraper 52 to rotate clockwise as shown in the figure. The lower ends of the first scraper 52 and the second scraper 53 contact each other. The drive component 54 continues to drive the first scraper 52 to rotate clockwise, and also drives the second scraper 53 to rotate clockwise, so that the end of the second scraper 53 slides on the first scraper 52, causing the first scraper 52 and the second scraper 53 to move to... Figure 6 As shown, the second scraper 53 scrapes away the residual slurry on the first scraper 52. When scraping out the next tab groove, the drive unit 54 drives the first scraper 52 to rotate counterclockwise, causing the first scraper 52 and the second scraper 53 to separate, becoming... Figure 5 The state shown.
[0035] The scraping device 5 based on the above scheme scrapes the slurry on the electrode sheet to form the tab groove by scraping the first scraper 52. After the tab groove is scraped, the driving component 54 drives the first scraper 52 to rotate toward the second scraper 53, so that the first scraper 52 and the second scraper 53 come into contact. When the first scraper 52 rotates, it drives the second scraper 53 to rotate, so that the second scraper 53 scrapes the slurry on the first scraper 52, thereby avoiding the accumulation of residual slurry on the first scraper 52. In this way, when the first scraper 52 continues to scrape out the next tab groove, the thickness of the slurry at the edge of the tab groove will not increase.
[0036] In some embodiments, such as Figure 5 and Figure 6 As shown, the first scraper 52 has a first scraping end 521 for scraping off the slurry on the electrode sheet, that is, the left end of the first scraper 52, and the second scraper 53 has a second scraping end 531, that is, the lower end of the second scraper 53. When the first scraper 52 rotates toward the second scraper 53, the second scraping end 531 can abut against the first scraper 52 and slide relative to the first scraper 52.
[0037] Specifically, when the first scraper 52 drives the second scraper to rotate clockwise, the second scraper end 531 moves to the left on the first scraper 52 until the second scraper end 531 overlaps with the first scraper end 521, thereby scraping off all the residual slurry on the first scraper 52.
[0038] In some embodiments, such as Figure 5 and Figure 6As shown, the substrate 51 has a chamber 511. When the first scraper 52 scrapes the slurry on the electrode, the second scraper end 531 separates from the first scraper 52, so that the slurry scraped from the electrode can enter the chamber 511 through the gap between the first scraper end 521 and the second scraper end 531. Specifically, as shown... Figure 5 As shown, the width of the gap between the first scraping end 521 and the second scraping end 531 is L4, and the gap between the first scraping end 521 and the second scraping end 531 is connected to the cavity 511 of the substrate 51.
[0039] In some embodiments, the substrate 51 is provided with a diluent inlet 512 and a vacuum interface 513, both of which are connected to the chamber 511. A diluent supply device supplies diluent to the chamber 511 through the diluent inlet 512. The diluent mixes with the scraped slurry. A negative pressure generating device provides negative pressure to the chamber 511 through the vacuum interface 513, thereby drawing away the mixture from the chamber 511.
[0040] In some embodiments, such as Figure 5 and Figure 6 As shown, the driving component 54 is located at one end of the first scraper 52, that is, the right end of the first scraper 52 in the figure. The driving component 54 includes a driving component 541 and an elastic component 542. The driving component 541 and the elastic component 542 are disposed opposite to each other on both sides of the first scraper 52. The force applied by the driving component 541 to the first scraper 52 is opposite in direction to the force applied by the elastic component 542 to the first scraper 52.
[0041] Specifically, the driving member 541 and the elastic member 542 are positioned opposite each other on the upper and lower sides of the first scraper member 52. The driving member 541 is located above the elastic member 542, and the elastic member 542 exerts an upward force on the first scraper member 52. When the first scraper member 52 scrapes off the slurry on the electrode sheet, the driving member 541 does not press down on the first scraper member 52, and the elastic member 542 pushes the first scraper member 52 upward. There is a gap between the first scraper member 52 and the second scraper member 53. When the second scraper member 53 scrapes off the slurry remaining on the first scraper member 52, the driving member 541 presses down on the first scraper member 52, causing the first scraper member 52 to rotate clockwise. After the second scraper member 53 finishes scraping, the driving member 541 rises, and the elastic member 542 pushes the first scraper member 52 upward, causing the first scraper member 52 to separate from the second scraper member 53, so that the next scraping of the electrode tab groove can be performed.
[0042] Optionally, the driving component 541 is a cylinder, the elastic component 542 is a compression spring, the driving component 541 is located above the first scraper component 52, and the elastic component 542 is located below the first scraper component 52.
[0043] In some embodiments, such as Figure 5 and Figure 6 As shown, the second scraper 53 includes a limiting plate 532 and a scraper 533. The limiting plate 532 is connected to the scraper 533. The limiting plate 532 can abut against the substrate 51, and the scraper 533 is used to abut against the first scraper 52.
[0044] Specifically, the limiting plate 532 and the scraper plate 533 are L-shaped. The length of the scraper plate 533 can be greater than the length of the limiting plate 532. The length of the scraper plate 533 can be 10mm-30mm, and the length of the limiting plate 532 can be 1mm-10mm. The second scraper 53 can rotate counterclockwise until the limiting plate 532 abuts against the base 51. The second scraper 53 stops rotating due to the limiting of the limiting plate 532. A limiting member that abuts against the limiting plate 532 can be provided on the base 51.
[0045] Optionally, the included angle between the limiting plate 532 and the scraper plate 533 is 60°-120°.
[0046] In some embodiments, such as Figure 5 and Figure 6 As shown, a connector 55 is provided on the base 51, and the connection between the limiting plate 532 and the scraper plate 533 is rotatably fitted onto the connector 55. The connector 55 can be a bolt, and a through hole with a diameter of, for example, 2 mm can be provided at the connection between the limiting plate 532 and the scraper plate 533 for the bolt to pass through. The bolt is detachably installed on the base 51 for easy replacement of the second scraper 53. After the second scraper 53 scrapes off the residual slurry on the first scraper 52, the first scraper 52 rotates counterclockwise. Simultaneously, the first scraper 52 also rotates counterclockwise under its own gravity.
[0047] like Figure 7 As shown in the embodiment of this application, a tab groove processing system is also provided for scraping out tab grooves on the electrode sheet 1. The tab groove processing system includes a vacuum pump 6, a waste liquid collection tank 7, a diluent supply device, and a scraping device 5 as described in the above embodiment. The waste liquid collection tank 7 and the diluent supply device are both connected to the scraping device 5, and the vacuum pump 6 is connected to the waste liquid collection tank 7.
[0048] The diluent supply device is connected to the diluent inlet 512 and is used to introduce diluent into the chamber 511. The waste liquid collection tank 7 is connected to the vacuum interface 513 and is used to collect the mixed liquid in the chamber 511. The vacuum pump 6 provides negative pressure to the chamber 511 through the waste liquid collection tank 7. A vacuum gauge 8 is also installed on the pipeline between the waste liquid collection tank 7 and the scraper device 5 to measure the magnitude of the negative pressure generated in the chamber 511.
[0049] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.
[0050] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A scraping device, characterized in that, include: The substrate, the first scraper, the second scraper, and the drive component; The first scraper is rotatably connected to the base, and the driving component is disposed on the base and connected to the first scraper. The driving component is used to drive the first scraper to rotate relative to the base. The second scraper is rotatably connected to the substrate. When the first scraper rotates toward the second scraper, it can abut against the second scraper and drive the second scraper to rotate relative to the substrate, so that the second scraper scrapes off the slurry on the first scraper.
2. The scraping device according to claim 1, characterized in that: The first scraper has a first scraping end for scraping off the slurry on the electrode sheet, and the second scraper has a second scraping end. When the first scraper rotates toward the second scraper, the second scraping end can abut against the first scraper and slide relative to the first scraper.
3. The scraping device according to claim 2, characterized in that: The substrate has a chamber. When the first scraper removes the slurry on the electrode, the second scraper end separates from the first scraper end so that the slurry scraped from the electrode can enter the chamber through the gap between the first scraper end and the second scraper end.
4. The scraping device according to claim 3, characterized in that: The substrate is provided with a diluent inlet and a vacuum interface, both of which are connected to the chamber.
5. The scraping device according to claim 1, characterized in that: The driving component is located at one end of the first scraper. The driving component includes a driving member and an elastic member. The driving member and the elastic member are disposed opposite to each other on both sides of the first scraper. The force applied by the driving member to the first scraper is opposite in direction to the force applied by the elastic member to the first scraper.
6. The scraping device according to claim 5, characterized in that: The driving component is a cylinder, the elastic component is a compression spring, the driving component is located above the first scraper, and the elastic component is located below the first scraper.
7. The scraping device according to claim 1, characterized in that: The second scraper includes a limiting plate and a scraper plate. The limiting plate is connected to the scraper plate, and the limiting plate can abut against the substrate. The scraper plate is used to abut against the first scraper.
8. The scraping device according to claim 7, characterized in that: The included angle between the limiting plate and the scraper plate is 60°-120°.
9. The scraping device according to claim 7, characterized in that: The substrate is provided with a connector, and the connection between the limiting plate and the scraper is rotatably sleeved on the connector.
10. A system for machining tab grooves, characterized in that, include: The device includes a vacuum pump, a waste liquid collection tank, a diluent supply device, and a scraping device as described in any one of claims 1-9, wherein the waste liquid collection tank and the diluent supply device are both connected to the scraping device, and the vacuum pump is connected to the waste liquid collection tank.