Method for manufacturing pole piece, pole piece, battery and electric device

Abstract

The application discloses a kind of pole piece preparation method, pole piece, battery and electric equipment, wherein, pole piece preparation method includes the following steps: obtaining mother piece;Determine the good area of the mother piece;In the good area, the mother piece is cut, and at least one semi-finished pole piece is obtained;Remove the dressing layer of the lug area of the semi-finished pole piece, and obtain a primary finished pole piece.The pole piece preparation method of the application, by determining the good area of the mother piece before cutting, is conducive to making full use of the good area of the mother piece, reducing the scrap rate of the mother piece, and effectively improving the yield of pole piece production, reducing the production cost of battery.

Description

Technical Field

[0001] This invention belongs to the field of battery technology, specifically relating to an electrode preparation method, an electrode, a battery, and an electrical device. Background Technology

[0002] In related technologies, when preparing electrodes, the mother sheet is usually slit, and the slit electrodes are inspected to obtain good electrodes. However, when there are defective areas in the mother sheet, the defective areas are easily cut into the electrodes during the slitting process, which affects the yield of the electrodes. Moreover, due to the slitting position, the mother sheet cannot be fully utilized, resulting in a high scrap rate of the mother sheet, which is not conducive to controlling production costs. Summary of the Invention

[0003] The first objective of this invention is to provide a new technical solution for electrode preparation methods, which can at least solve the technical problem that existing electrode preparation methods easily lead to a high rate of mother sheet scrap.

[0004] The second objective of this invention is to provide a new technical solution for electrode sheets.

[0005] The third objective of this invention is to provide a new technical solution for batteries.

[0006] The fourth objective of this invention is to provide a new technical solution for electrical equipment.

[0007] According to a first aspect of the present invention, an electrode preparation method is provided, comprising the following steps: obtaining a master sheet; determining a good product region of the master sheet; cutting the master sheet in the good product region to obtain at least one semi-finished electrode; removing the dressing layer of the tab region of the semi-finished electrode to obtain a primary finished electrode.

[0008] Optionally, the method for removing the dressing layer in the tab area of ​​the semi-finished electrode sheet is either immersion separation or laser removal.

[0009] Optionally, the step of removing the dressing layer of the tab area of ​​the semi-finished electrode to obtain a first-grade finished electrode includes: providing a cleaning liquid; immersing the tab area of ​​the semi-finished electrode in the cleaning liquid and removing it after a first preset time; separating the dressing layer of the tab area from the semi-finished electrode to obtain a first-grade finished electrode.

[0010] Optionally, the step of removing the coating layer from the surface of the semi-finished electrode to obtain the primary finished electrode further includes:

[0011] When the dressing layer in the tab area is immersed in the cleaning liquid, the cleaning liquid is agitated.

[0012] Optionally, the step of removing the coating layer on the surface of the semi-finished tab to obtain the primary finished tab further comprises: providing negative pressure to remove the volatilized substance generated by the cleaning liquid.

[0013] Optionally, the method further comprises: drying the primary finished tab to obtain a secondary finished tab.

[0014] Optionally, the step of drying the primary finished tab to obtain a secondary finished tab comprises: blowing air to the tab ear area of the primary finished tab to remove the cleaning liquid remaining in the tab ear area; and / or baking the primary finished tab to obtain a secondary finished tab.

[0015] Optionally, the temperature of the air is 50-85°C.

[0016] Optionally, when the air is blown to the tab ear area of the primary finished tab, the height of the tab ear area is lower than the height of the main body area of the primary finished tab, and the air is blown from the height of the main body area to the height of the tab ear area.

[0017] Optionally, the semi-finished tab has an isolation groove that separates the coating layer of the tab ear area from the main body area of the semi-finished tab.

[0018] Optionally, the width of the isolation groove is 4-6mm.

[0019] Optionally, the step of preparing the semi-finished tab with the isolation groove comprises: cutting the master tab in the good area to obtain a base body of the semi-finished tab; and setting the isolation groove on the surface of the base body to obtain at least one semi-finished tab.

[0020] Optionally, the step of preparing the semi-finished tab with the isolation groove comprises: setting the isolation groove on the surface of the good area to obtain a master tab with the isolation groove; and cutting the master tab in the good area to obtain at least one semi-finished tab with the isolation groove.

[0021] Optionally, the isolation groove is a rectangular groove or a trapezoidal groove.

[0022] Optionally, the method of generating the isolation groove is laser cleaning, and the method of cutting the master tab is laser cutting.

[0023] Optionally, the temperature of the substance for soaking the coating layer of the tab ear area is 50-80°C.

[0024] Optionally, the substance for soaking the coating layer of the tab ear area is water or a cleaning agent.

[0025] According to a second aspect of the present application, a tab is provided, which is obtained by the above-mentioned tab preparation method.

[0026] According to a third aspect of the present application, a battery is provided, the battery comprising the tab as claimed in the above claims.

[0027] According to a fourth aspect of the present application, an electric device is provided, the electric device comprising the battery as claimed in the above claims.

[0028] According to the tab manufacturing method of the present application, by determining the good area of the mother tab before slitting the mother tab, the good area of the mother tab can be fully utilized, the scrap rate of the mother tab is reduced, and the production cost of the battery is reduced.

[0029] Other features of the present application, its nature and advantages will become apparent from the accompanying detailed description of the exemplary embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0031] Figure 1 is a flow chart of a tab manufacturing method according to an embodiment provided by the present application;

[0032] Figure 2 is a schematic diagram of a tab manufacturing method according to an embodiment provided by the present application when the tab ear area is immersed in a cleaning liquid;

[0033] Figure 3 is a structural schematic diagram of an isolation groove according to an embodiment provided by the present application;

[0034] Figure 4 is a structural schematic diagram of an isolation groove according to another embodiment provided by the present application;

[0035] Figure 5 is a schematic diagram of a tab manufacturing method according to an embodiment provided by the present application when air is blown to the tab ear area.

[0036] Reference Signs:

[0037] Body area 10; tab ear area 20; isolation groove 30. DETAILED DESCRIPTION

[0038] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions, and numerical values set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0039] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the application or its applications or uses.

[0040] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0041] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0043] The electrode preparation method according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] like Figure 1 As shown, the electrode preparation method according to an embodiment of the present invention includes steps 100 to 400.

[0045] Step 100: Obtain the master image;

[0046] Specifically, the methods for obtaining the master image include, but are not limited to, the following:

[0047] Case 1: The master sheet can be directly cut from the electrode roll. The electrode roll is formed by winding a current collector with coating material on both sides in the thickness direction.

[0048] Scenario 2: The master sheet can be a large electrode sheet (original electrode sheet), which can be used to prepare a small electrode sheet;

[0049] Scenario 3: Before battery electrolyte filling, during the processing, even a single defective cell can render the entire cell unusable. In related technologies, to improve material utilization, physical or chemical methods are typically used to separate and recover the active materials (coatings) from the electrode sheets of the battery cell. However, this recycling method is costly. Therefore, the method for obtaining the master sheet in this embodiment can be as follows: Remove the original electrode sheet from the original electrode core (e.g., a defective electrode core). The original electrode sheet can be either a positive or negative electrode sheet. After separating the original electrode sheet from the original electrode core, remove any residue from its surface to obtain the master sheet.

[0050] It should be noted that the master sheet can also be other defective electrode sheets (original electrode sheets), as long as the master sheet has a certain area of ​​good product area.

[0051] Step 200: Determine the good product area of ​​the master film;

[0052] In other words, during preparation, the good area of the master sheet can be determined by manual or equipment detection, such as CCD detection, and the size of the good area should meet the size of the smaller size electrode sheet, so that the material in the good area can be used to prepare the finished electrode sheet with smaller area, the good area of the master sheet can be fully utilized, and the yield of the finished electrode sheet can be ensured.

[0053] Step 300, the master sheet is cut in the good area to obtain at least one semi-finished electrode sheet;

[0054] In detail, according to the size of the good area and the size of the required finished electrode sheet, the good area is cut into one or more semi-finished electrode sheets, so that the good area of the master sheet can be fully utilized, the scrap rate of the master sheet can be reduced, that is, the material of the original electrode sheet or the partially damaged electrode sheet in the poor electrode core can be reused, the production cost of the battery can be reduced, the purpose of recycling the lithium battery production materials is achieved, the reutilization rate of the battery production material resources is improved, and the scientific concept of green cycle is met.

[0055] It should be noted that the semi-finished electrode sheet can be understood as the current collector whose both sides in the thickness direction are entirely covered with the coating layer.

[0056] Step 400, the coating layer of the tab area 20 of the semi-finished electrode sheet is removed to obtain a first finished electrode sheet.

[0057] Specifically, the semi-finished electrode sheet can be divided into a main body area 10 and a tab area 20 along the length direction, and the main body area 10 and the tab area 20 are both provided with the coating layer on both sides in the thickness direction. The coating layer on both sides of the tab area 20 is removed to obtain the first finished electrode sheet, and the first finished electrode sheet can be applied to the subsequent battery production as the required electrode sheet of the battery.

[0058] Therefore, according to the electrode sheet preparation method of the embodiment of the application, the good area of the master sheet is determined before the master sheet is cut, which is beneficial to fully utilize the good area of the master sheet, reduce the scrap rate of the master sheet, and effectively improve the yield of the electrode sheet production and reduce the production cost of the battery.

[0059] According to an embodiment of the application, the method for removing the coating layer of the tab area 20 of the semi-finished electrode sheet is soaking separation method or laser removal method.

[0060] In some specific embodiments of the application, the step of removing the coating layer of the tab area 20 of the semi-finished electrode sheet to obtain the first finished electrode sheet includes steps 410 to 430.

[0061] Step 410, providing a cleaning liquid;

[0062] Specifically, a cleaning liquid of a set depth is poured into the container. The depth of the cleaning liquid should be greater than the dimension of the tab area 20 in the length direction of the semi-finished electrode sheet, so that the dressing layer of the tab area 20 can be completely immersed in the cleaning liquid.

[0063] Step 420: Immerse the tab area 20 of the semi-finished electrode sheet in the cleaning liquid and remove it after the first preset time;

[0064] In detail, such as Figure 2 As shown, the semi-finished electrode sheet is placed perpendicular to the surface of the cleaning liquid, with the main body area 10 of the semi-finished electrode sheet located above the tab area 20. The tab area 20 of the semi-finished electrode sheet is immersed in the cleaning liquid using manual labor or a robotic arm, and removed after a first preset time, such as 2s to 10s. Under the action of the cleaning liquid, the dressing in the tab area 20 separates from the current collector (aluminum foil) of the semi-finished electrode sheet, or the connection strength weakens.

[0065] Step 430: Separate the dressing layer of the tab area 20 from the semi-finished electrode sheet to obtain the first-grade finished electrode sheet.

[0066] In other words, when the tab area 20 is still covered with a dressing layer, the dressing layer attached to the current collector of the tab area 20 can be separated from the semi-finished electrode sheet by blowing, brushing or scraping. After separating the dressing layer attached to the tab area 20 from the semi-finished electrode sheet, a first-grade finished electrode sheet can be obtained.

[0067] In this embodiment, the immersion separation method removes the dressing layer of the tab region 20. Compared with laser removal of the dressing layer, this method can avoid oxidation of the current collector in the tab region 20, thus ensuring the subsequent welding effect and conductivity.

[0068] In some examples of the present invention, the dressing layer attached to the tab region 20 is separated from the semi-finished electrode sheet by blowing air. Blowing air not only separates the dressing layer attached to the tab region 20 from the semi-finished electrode sheet, but also removes any residual liquid remaining on the semi-finished electrode sheet.

[0069] According to one embodiment of the present invention, the step of removing the coating layer on the surface of the semi-finished electrode sheet to obtain the first-grade finished electrode sheet further includes: step 421.

[0070] Step 421: When the dressing layer in the tab area 20 is immersed in the cleaning liquid, the cleaning liquid is shaken.

[0071] Specifically, the container for holding the cleaning liquid is an ultrasonic cleaning device. When the dressing layer in the tab area 20 is immersed in the cleaning liquid, the ultrasonic cleaning device can cause the cleaning liquid to vibrate at a certain frequency, which can accelerate the shedding of the dressing layer and thus improve the production efficiency of the electrode.

[0072] In the embodiment, the relative movement of the semi-finished tab and the cleaning liquid can make the cleaning liquid impact the coating layer of the tab area 20, preventing the coating layer and the tab area 20 from being adsorbed together due to moisture.

[0073] In some embodiments of the present application, the step of removing the coating layer on the surface of the semi-finished tab to obtain the primary finished tab further comprises: step 422.

[0074] Step 422, provide negative pressure to remove the volatiles generated by the cleaning liquid.

[0075] In detail, an exhaust structure is provided above the liquid surface of the cleaning liquid, and a certain negative pressure can be provided through the exhaust structure. During the process of immersing the coating layer of the tab area 20 into the cleaning liquid, the volatiles generated by the cleaning liquid, such as water vapor, can be removed through the exhaust structure, so that the volatiles generated by the cleaning liquid can be prevented from adhering to the main area 10 of the semi-finished tab and eroding the coating layer on the surface thereof, thereby ensuring the quality of the finished tab.

[0076] According to an embodiment of the present application, the method for preparing the tab further comprises: step 500.

[0077] Step 500, dry the primary finished tab to obtain a secondary finished tab.

[0078] In the embodiment, the method for preparing the primary finished tab comprises the soaking separation method, and the water content of the primary finished tab obtained after soaking will increase to a certain extent, which will have a certain influence on the performance thereof. Based on this, the primary finished tab can be dried by using a heating device or the like, and the moisture of the primary finished tab is gradually reduced or removed in the drying process, thereby obtaining a secondary finished tab with higher product performance.

[0079] In some embodiments of the present application, the step of drying the primary finished tab to obtain a secondary finished tab comprises: step 510.

[0080] Step 510, blow air to the tab area 20 of the primary finished tab to blow off the cleaning liquid remaining in the tab area 20;

[0081] Specifically, as shown in Figure 5 the air blowing device is used to blow air to the tab area 20 of the primary finished tab, the cleaning liquid remaining in the tab area 20 can be quickly evaporated when blowing air, and the larger cleaning liquid can fall from the tab area 20 under the action of the gas, which can improve the drying process of the primary finished tab.

[0082] The method can further comprise: step 520.

[0083] Step 520, bake the primary finished tab to obtain a secondary finished tab.

[0084] In detail, after the cleaning liquid remaining on the surface of the tab area 20 of the first finished product tab is preliminarily cleaned by the blowing method, the first finished product tab can be placed in the baking equipment, and the whole first finished product tab can be baked by the baking equipment, so that the moisture contained in the first finished product tab can be reduced or removed, and thus the second finished product tab with higher product performance can be obtained.

[0085] According to an embodiment of the present application, the temperature of the blowing is 50-85℃.

[0086] That is, the tab area 20 can be heated while being blown, for example, the temperature of the blowing can be set to 50-85℃, so that the evaporation of the moisture of the tab area 20 can be improved, and the moisture can be quickly removed.

[0087] In some embodiments of the present application, when the tab area 20 of the first finished product tab is blown, the height of the tab area 20 is lower than the height of the main body area 10 of the first finished product tab, and the gas is blown from the height of the main body area 10 to the height of the tab area 20.

[0088] In other words, when the tab area 20 of the first finished product tab is blown, the first finished product tab is vertically arranged, and the tab area 20 is located below the main body area 10, the horizontal height of the blowing equipment is higher than the horizontal height of the tab area 20, and the angle between the gas outlet direction of the blowing equipment and the surface of the first finished product tab is less than 90 degrees, for example, it can be between 10 degrees and 45 degrees, thereby preventing the moisture from being blown to the main body area 10 of the first finished product tab, and ensuring the product performance of the finished product tab.

[0089] According to an embodiment of the present application, the semi-finished product tab has an isolation groove 30, which separates the tab area 20 of the semi-finished product tab from the coating layer of the main body area 10.

[0090] Specifically, the semi-finished product tab is provided with an isolation groove 30 on each side in the thickness direction, and the isolation groove 30 exposes the coating layer of the current collector of the semi-finished product tab, and the coating layer of the main body area 10 and the coating layer of the tab area 20 are separated by the isolation grooves 30 on both sides of the semi-finished product tab. When the coating layer of the tab area 20 is immersed in the cleaning liquid, the isolation groove 30 separates the coating layer of the main body area 10 from the cleaning liquid, which can prevent the cleaning liquid from being adsorbed onto the coating layer of the main body area 10 and causing the coating layer to fall off, and can ensure the yield of the finished product tab.

[0091] In some embodiments of the present application, the width of the isolation groove 30 is 4-6mm, so that the cleaning liquid cannot be adsorbed onto the coating layer of the main body area 10, and the yield of the finished product tab can be ensured.

[0092] According to one embodiment of the present application, the step of preparing the semi-finished pole piece with the isolation groove 30 comprises steps 310 and 320.

[0093] Step 310, cutting the master piece in the good area to obtain the base of the semi-finished pole piece.

[0094] In detail, the base of the semi-finished pole piece is cut out from the master piece in the good area by using a laser device or other cutting device, and the base of the semi-finished pole piece is separated from the other part of the master piece, so that one or more bases of the semi-finished pole piece can be obtained.

[0095] Step 320, setting the isolation groove 30 on the surface of the base to obtain at least one semi-finished pole piece.

[0096] Specifically, the isolation groove 30 is respectively cleaned out on the two surfaces in the thickness direction of the base by using a laser device, and the isolation groove 30 penetrates the coating layer on the surface of the base, so that the current collector at the position of the isolation groove 30 is exposed, thereby at least one semi-finished pole piece with the isolation groove 30 can be obtained.

[0097] In the embodiment, the device for processing the isolation groove 30 and cutting the master piece is a laser device, and different devices do not need to be replaced in the process of processing the semi-finished pole piece, so that the production efficiency of the finished pole piece can be effectively improved.

[0098] In some specific embodiments of the present application, the step of preparing the semi-finished pole piece with the isolation groove 30 comprises steps 330 and 340.

[0099] Step 330, setting the isolation groove 30 on the surface of the good area to obtain the master piece with the isolation groove 30.

[0100] In detail, one or more isolation grooves 30 are respectively cleaned out on the two surfaces in the thickness direction of the good area of the master piece by using a laser device, and the isolation groove 30 penetrates the coating layer on the surface of the good area, so that the current collector at the position of the isolation groove 30 is exposed, thereby the master piece with the isolation groove 30 can be obtained.

[0101] Step 340, cutting the master piece in the good area to obtain at least one semi-finished pole piece with the isolation groove 30.

[0102] Specifically, the master piece is cut in the good area of the master piece by using a laser device or other cutting device, so that one or more semi-finished pole pieces with the isolation groove 30 can be obtained.

[0103] In the embodiment, the isolation groove 30 is generated before cutting the master piece, i.e., before the semi-finished pole piece is separated from the master piece, so that the isolation groove 30 on the two sides of the semi-finished pole piece can be processed, and the production efficiency of the finished pole piece can be improved.

[0104] According to an embodiment of the present application, the isolation groove 30 is a rectangular groove or a trapezoidal groove.

[0105] That is, as shown in Figure 3 and Figure 4 , the isolation groove 30 can be formed as a rectangular groove, and the isolation groove 30 can also be formed as a trapezoidal groove. For example, in step 300, the isolation groove 30 can be a trapezoidal groove, in which the larger side of the trapezoidal groove is close to the body area 10, and the smaller side of the trapezoidal groove is close to the tab area 20.

[0106] In the present embodiment, the transition area between the tab area 20 and the body area 10 is approximately trapezoidal, and the isolation groove 30 is also trapezoidal, so that the area of the isolation groove 30 can be reduced while meeting the requirements, thereby reducing the time for setting the isolation groove 30, and further improving the production efficiency of the finished tab.

[0107] In some embodiments of the present application, the method of generating the isolation groove 30 is laser cleaning, and the method of cutting the mother sheet is laser cutting, so that the two processes can be completed by laser equipment, thereby improving the production efficiency of the finished tab.

[0108] According to an embodiment of the present application, the temperature of the cleaning liquid for soaking the dressing layer of the tab area 20 is 50-80°C.

[0109] That is, the temperature of the cleaning liquid can be 50-80°C, and in this temperature range, the separation process of the dressing layer of the tab area 20 can be accelerated, thereby improving the production efficiency of the finished tab.

[0110] In some embodiments of the present application, the substance for soaking the dressing layer of the tab area 20 is water or a cleaning agent.

[0111] Specifically, the cleaning liquid can be water, and the temperature of the water can be 50-80°C. In this temperature range, the water will not boil, which can effectively avoid the water from touching the dressing layer of the body area 10, and can accelerate the separation process of the dressing layer of the tab area 20, thereby improving the production efficiency of the finished tab. Moreover, the water will not erode the current collector of the tab, which can ensure the product performance of the finished tab, and is convenient for recycling the separated dressing layer.

[0112] In addition, the cleaning liquid can also be a cleaning agent, such as an acidic cleaning liquid, or other cleaning liquids for dressing that will not erode the current collector. The cleaning agent has a faster separation efficiency of the dressing layer than water, which can improve the production efficiency of the finished tab.

[0113] In some examples of the present application, the environment temperature of the main body area 10 of the semi-finished electrode sheet is the same as the temperature of the cleaning liquid, so that the generation of water vapor can be avoided, and the uniformity of the cleaning liquid can be ensured, so that the erosion of the coating layer of the main body area 10 by the cleaning liquid can be effectively avoided, and the product performance of the finished electrode sheet can be ensured.

[0114] It should be noted that in the present application, the "first level" and "second level" described in the first level finished electrode sheet and the second level finished electrode sheet are only to distinguish products of different qualities, or to distinguish products obtained by different steps, and are not limited to subsequent use. They can all be used directly as final products (electrode sheets required by batteries).

[0115] In summary, according to the electrode sheet preparation method of the embodiment of the present application, by determining the good area of the mother sheet before slitting the mother sheet, the good area of the mother sheet can be fully utilized, the scrap rate of the mother sheet can be reduced, and the yield of the electrode sheet production can be effectively improved, and the production cost of the battery can be reduced.

[0116] The embodiment of the present application also provides an electrode sheet, which is obtained by the electrode sheet preparation method described in any of the above embodiments. Since the electrode sheet preparation method of the embodiment of the present application has the advantages described above, the electrode sheet according to the embodiment of the present application also has corresponding advantages, which will not be described here.

[0117] The embodiment of the present application also provides a battery, which comprises the electrode sheet described in the above embodiments. Since the electrode sheet of the embodiment of the present application has the advantages described above, the battery according to the embodiment of the present application also has corresponding advantages, which will not be described here.

[0118] The embodiment of the present application also provides an electric device, for example, but not limited to, a vehicle, which comprises the battery described in the above embodiments. Since the battery of the embodiment of the present application has the advantages described above, the battery according to the embodiment of the present application also has corresponding advantages, which will not be described here.

[0119] Although some specific embodiments of the present application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, but not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A method of manufacturing a pole piece, characterized by, The method comprises the following steps: obtaining a master sheet; determining a good area of the master sheet; cutting the master sheet in the good area to obtain at least one semi-finished pole piece, the semi-finished pole piece having an isolation groove separating a tab area of the semi-finished pole piece from a coating layer of a main body area; removing the coating layer of the tab area of the semi-finished pole piece to obtain a primary finished pole piece; the step of removing the coating layer of the tab area of the semi-finished pole piece to obtain a primary finished pole piece comprises: providing a cleaning liquid; immersing the tab area of the semi-finished pole piece in the cleaning liquid and taking out after a first preset time; separating the coating layer of the tab area from the semi-finished pole piece to obtain a primary finished pole piece.

2. The pole piece manufacturing method according to claim 1, characterized by, the step of removing the coating layer on the surface of the semi-finished pole piece to obtain a primary finished pole piece further comprises: vibrating the cleaning liquid when the coating layer of the tab area is immersed in the cleaning liquid.

3. The pole piece manufacturing method according to claim 1, wherein the step of removing the coating layer on the surface of the semi-finished pole piece to obtain a primary finished pole piece further comprises: providing a negative pressure to remove volatiles generated by the cleaning liquid.

4. The pole piece manufacturing method according to claim 1, wherein The method further comprises: drying the primary finished pole piece to obtain a secondary finished pole piece.

5. The pole piece manufacturing method according to claim 4, wherein the step of drying the primary finished pole piece to obtain a secondary finished pole piece comprises: blowing air to the tab area of the primary finished pole piece to remove residual cleaning liquid in the tab area; and / or baking the primary finished pole piece to obtain a secondary finished pole piece.

6. The pole piece manufacturing method according to claim 5, wherein The temperature of the air is 50-85°C.

7. The pole piece manufacturing method according to claim 5, wherein When the air is blown to the tab area of the primary finished pole piece, the height of the tab area is lower than the height of the main body area of the primary finished pole piece, and the air is blown from the height of the main body area to the height of the tab area.

8. The pole piece preparation method of claim 1, wherein The width of the isolation groove is 4-6mm.

9. The pole piece manufacturing method according to claim 1, wherein The step of preparing the semi-finished pole piece with the isolation groove comprises: cutting the master sheet in the good area to obtain a base body of the semi-finished pole piece; providing the isolation groove on the surface of the base body to obtain at least one semi-finished pole piece.

10. The pole piece preparation method of claim 1, wherein The step of preparing the semi-finished pole piece with the isolation groove comprises: providing the isolation groove on the surface of the good area to obtain a master sheet with the isolation groove; cutting the master sheet in the good area to obtain at least one semi-finished pole piece with the isolation groove.

11. The pole piece manufacturing method according to claim 10, wherein The isolation groove is a rectangular groove or a trapezoidal groove.

12. The pole piece manufacturing method according to claim 9 or 10, characterized in that, The method of generating the isolation groove is laser cleaning, and the method of cutting the master sheet is laser cutting.

13. The pole piece preparation method of claim 1, wherein The temperature of immersing the coating layer of the tab area is 50-80°C.

14. The pole piece preparation method of claim 1, wherein The substance for immersing the coating layer of the tab area is water or a cleaning agent.

15. A pole piece characterized by, The pole piece is obtained by the pole piece preparation method of any one of claims 1-14.

16. A battery, characterized by The pole piece of claim 15 is included.

17. An electrical device, characterized by The battery of claim 16 is included.

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