Pole piece preparation method, pole piece, battery and electric equipment

Abstract

The invention discloses a pole piece preparation method, a pole piece, a battery and electric equipment, and the pole piece preparation method comprises the following steps: obtaining a master slice; determining a good product area of the master slice; cutting the master slice in the non-defective product area to obtain at least one semi-finished product pole piece; and removing the dressing layer in the tab area of the semi-finished product pole piece to obtain a first-grade finished product pole piece. According to the preparation method of the pole piece, the good product area of the master piece is determined before the master piece is slit, so that the good product area of the master piece is fully utilized, the rejection rate of the master piece is reduced, the production yield of the pole piece can be effectively improved, and the production cost of a battery is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a method for preparing a pole piece, a pole piece, a battery and an electrical device. Background Art

[0002] In the related art, when preparing the electrode, the mother sheet is usually cut and the cut electrode sheets are tested to obtain good electrode sheets. However, when there are bad areas in the mother sheet, the bad areas are easily cut into the electrode sheets when the mother sheet is cut, thereby affecting the yield of the electrode sheets. In addition, due to the cutting 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 the present invention is to provide a new technical solution for a pole piece preparation method, which can at least solve the technical problem that the existing pole piece preparation method easily leads to a high mother piece scrap rate.

[0004] The second object of the present invention is to provide a new technical solution for pole pieces.

[0005] The third object of the present invention is to provide a new technical solution for batteries.

[0006] The fourth object of the present invention is to provide a new technical solution for electrical equipment.

[0007] According to a first aspect of the present invention, there is provided a method for preparing an electrode, comprising the following steps: obtaining a mother sheet; determining a good product area of ​​the mother sheet; cutting the mother sheet in the good product area to obtain at least one semi-finished electrode sheet; and removing a dressing layer in a tab area of ​​the semi-finished electrode sheet to obtain a first-level finished electrode sheet.

[0008] Optionally, the method for removing the dressing layer in the tab area of ​​the semi-finished pole piece is an immersion separation method or a laser removal method.

[0009] Optionally, the steps of removing the dressing layer in the tab area of ​​the semi-finished pole piece to obtain a first-level finished pole piece include: providing a cleaning liquid; immersing the tab area of ​​the semi-finished pole piece in the cleaning liquid and taking it out at a first preset time; separating the dressing layer in the tab area from the semi-finished pole piece to obtain a first-level finished pole piece.

[0010] Optionally, the step of removing the dressing layer on the surface of the semi-finished electrode piece to obtain a first-level finished electrode piece further includes:

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

[0012] Optionally, the step of removing the dressing layer on the surface of the semi-finished electrode piece to obtain a first-level finished electrode piece further includes: providing negative pressure to extract volatiles generated by the cleaning liquid.

[0013] Optionally, the method further comprises: drying the first-level finished electrode piece to obtain a second-level finished electrode piece.

[0014] Optionally, the step of drying the first-level finished electrode sheet to obtain the second-level finished electrode sheet includes: blowing air into the electrode ear area of ​​the first-level finished electrode sheet to blow away the cleaning liquid remaining in the electrode ear area; and / or baking the first-level finished electrode sheet to obtain the second-level finished electrode sheet.

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

[0016] Optionally, when blowing air into the tab area of ​​the first-level finished electrode sheet, the height of the tab area is lower than the height of the main body area of ​​the first-level finished electrode sheet, and the gas is blown from the height of the main body area to the height of the tab area.

[0017] Optionally, the semi-finished pole piece has an isolation groove, which separates the electrode ear area of ​​the semi-finished pole piece from the dressing layer of the main body area.

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

[0019] Optionally, the step of preparing the semi-finished pole piece with the isolation groove includes: cutting the mother sheet in the good product area to obtain a substrate of the semi-finished pole piece; and setting the isolation groove on the surface of the substrate to obtain at least one semi-finished pole piece.

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

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

[0022] Optionally, the method for generating the isolation groove is laser cleaning, and the method for cutting the mother sheet is laser cutting.

[0023] Optionally, the temperature of the dressing layer in which the tab area is immersed is 50°C to 80°C.

[0024] Optionally, the substance used to soak the dressing layer in the tab area is water or a cleaning agent.

[0025] According to a second aspect of the present invention, a pole piece is provided, and the pole piece is obtained by the above-mentioned pole piece preparation method.

[0026] According to a third aspect of the present invention, a battery is provided, comprising the pole piece as claimed in claim 1.

[0027] According to a fourth aspect of the present invention, there is provided an electrical device comprising the above-mentioned battery.

[0028] According to the pole piece preparation method of the present invention, by determining the good area of ​​the mother sheet before cutting the mother sheet, it is beneficial to fully utilize the good area of ​​the mother sheet, reduce the scrap rate of the mother sheet, and reduce the production cost of the battery.

[0029] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0031] Figure 1 is a flow chart of a method for preparing a pole piece according to an embodiment of the present invention;

[0032] Figure 2 is a schematic diagram of a method for preparing a pole piece according to an embodiment of the present invention when a pole ear area is immersed in a cleaning liquid;

[0033] Figure 3 is a schematic structural diagram of an isolation trench according to an embodiment of the present invention;

[0034] Figure 4 is a schematic structural diagram of an isolation trench according to another embodiment of the present invention;

[0035] Figure 5 It is a schematic diagram of blowing air into the pole ear area according to a pole piece preparation method of an embodiment provided by the present invention.

[0036] Reference numerals:

[0037] Main body region 10 ; Tab region 20 ; Isolation trench 30 . DETAILED DESCRIPTION

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

[0039] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0040] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

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

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

[0043] The following first describes in detail the method for preparing a pole piece according to an embodiment of the present invention with reference to the accompanying drawings.

[0044] like Figure 1 As shown, the pole piece preparation method according to an embodiment of the present invention includes: step 100 to step 400.

[0045] Step 100: Obtain a master slice;

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

[0047] Case 1: The mother sheet can be cut directly from the pole roll, which is formed by winding the current collector with the dressing coated on both sides in the thickness direction;

[0048] Case 2: The mother plate can be a large pole plate (original pole plate) with a larger size, thereby the large pole plate can be prepared into a small-sized pole plate;

[0049] Case three: Before the battery is filled with liquid, often during the processing, as long as one defective cell in the battery will cause the entire cell to be scrapped. In the related art, in order to improve the utilization rate of materials, physical or chemical methods are usually used to separate and recover the active materials (dressings) in the pole pieces of the battery cells to improve the utilization rate of materials, but this recycling method is relatively costly. Based on this, the method for obtaining the mother sheet of this embodiment can be: remove the original pole sheet in the original pole core (for example, a defective pole core), the original pole sheet can be a positive pole sheet or a negative pole sheet, and after separating the original pole sheet from the original pole core, remove the residue on the surface of the original pole sheet to obtain the mother sheet.

[0050] It should be noted that the mother chip can also be other defective chips (original chips), as long as a certain area of ​​good quality area is ensured on the mother chip.

[0051] Step 200, determining a good area of ​​the mother wafer;

[0052] In other words, during preparation, the good area of ​​the mother sheet can be determined by manual or equipment detection, such as CCD detection. The size of the good area should meet the size of the smaller-sized electrode, so that the material in the good area can be used to prepare smaller finished electrode sheets in the subsequent preparation. The good area of ​​the mother sheet can be fully utilized, and the yield of the finished electrode can be guaranteed at the same time.

[0053] Step 300, cutting the mother slices in the good product classification to obtain at least one semi-finished electrode slice;

[0054] In detail, according to the size of the good area and the size of the required finished electrode sheet, the good area is divided into one or more semi-finished electrode sheets, so that the good area of ​​the mother sheet can be fully utilized and the scrap rate of the mother sheet can be reduced. That is, the materials of the original electrode sheets or partially damaged electrode sheets in the defective electrode core can be reused, which can reduce the production cost of the battery, achieve the purpose of recycling lithium battery production materials, improve the reuse rate of battery production material resources, and meet the scientific concept of green circulation.

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

[0056] Step 400: remove the dressing layer in the tab region 20 of the semi-finished electrode to obtain a first-level finished electrode.

[0057] Specifically, the semi-finished pole piece can be divided into a main body area 10 and a tab area 20 along the length direction, wherein the main body area 10 and the tab area 20 are provided with dressing layers on both sides of the thickness direction thereof. The first-level finished pole piece can be obtained by removing the dressing layers on both sides of the tab area 20. The first-level finished pole piece can be used as the pole piece required for the battery in the subsequent production of batteries.

[0058] Therefore, according to the electrode preparation method of the embodiment of the present invention, by determining the good area of ​​the mother sheet before cutting the mother sheet, it is beneficial to fully utilize the good area of ​​the mother sheet, reduce the scrap rate of the mother sheet, and effectively improve the yield of electrode production and reduce the production cost of the battery.

[0059] According to one embodiment of the present invention, the method for removing the coating layer in the tab region 20 of the semi-finished pole piece is an immersion separation method or a laser removal method.

[0060] In some specific embodiments of the present invention, the step of removing the dressing layer in the tab region 20 of the semi-finished electrode sheet to obtain a first-level finished electrode sheet includes: step 410 to step 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 pole piece, so that the dressing layer of the tab area 20 can be completely immersed in the cleaning liquid.

[0063] Step 420, immersing the tab region 20 of the semi-finished pole piece into a cleaning liquid, and taking it out at a first preset time;

[0064] In detail, Figure 2 As shown, the semi-finished electrode piece is placed perpendicular to the liquid surface of the cleaning liquid, the main body area 10 of the semi-finished electrode piece is located above the tab area 20, and the tab area 20 of the semi-finished electrode piece is immersed in the cleaning liquid by manual or mechanical equipment, and taken out at a first preset time, for example, 2s to 10s. Under the action of the cleaning liquid, the dressing in the tab area 20 is separated from the current collector (aluminum foil) of the semi-finished electrode piece or the connection strength is reduced.

[0065] Step 430 , separating the dressing layer in the tab area 20 from the semi-finished electrode piece to obtain a first-level finished electrode piece.

[0066] That is to say, when there is still a dressing layer attached to the pole lug area 20, the dressing layer attached to the current collector in the pole lug area 20 can be separated from the semi-finished pole piece by blowing, brushing or scraping, and a first-level finished pole piece can be obtained after separating the dressing layer attached to the pole lug area 20 from the semi-finished pole piece.

[0067] In this embodiment, the dressing layer in the tab area 20 is removed by immersion separation. Compared with laser removal of the dressing layer, oxidation of the current collector in the tab area 20 can be avoided, and subsequent welding and conductive effects can be ensured.

[0068] In some examples of the present invention, the dressing layer attached to the tab area 20 is separated from the semi-finished pole piece by blowing air. The blowing method can not only separate the dressing layer attached to the tab area 20 from the semi-finished pole piece, but also remove the residual liquid remaining on the semi-finished pole piece.

[0069] According to one embodiment of the present invention, the step of removing the dressing layer on the surface of the semi-finished electrode piece to obtain a first-level finished electrode piece 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 vibrated.

[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, thereby improving the production efficiency of the electrode.

[0072] In this embodiment, the relative movement between the semi-finished electrode and the cleaning liquid can cause the cleaning liquid to impact the dressing layer in the tab area 20 , thereby preventing the dressing layer and the tab area 20 from being adsorbed together due to moisture.

[0073] In some specific embodiments of the present invention, the step of removing the dressing layer on the surface of the semi-finished electrode piece to obtain a first-level finished electrode piece further includes: step 422.

[0074] Step 422: Provide negative pressure to remove 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. In the process of immersing the dressing layer in the pole ear area 20 in the cleaning liquid, the volatile substances generated by the cleaning liquid, such as water vapor, can be extracted through the exhaust structure, thereby preventing the volatile substances generated by the cleaning liquid from adhering to the main area 10 of the semi-finished pole piece and causing erosion on the dressing layer on its surface, thereby ensuring the quality of the finished pole piece.

[0076] According to one embodiment of the present invention, the method for preparing a pole piece further includes: step 500 .

[0077] Step 500: Dry the first-level finished electrode to obtain the second-level finished electrode.

[0078] In this embodiment, the method for preparing the first-level finished electrode piece includes a soaking separation method. The water content of the first-level finished electrode piece obtained after soaking will increase to a certain extent, which has a certain impact on its performance. Based on this, the first-level finished electrode piece can be dried using a heating device or other equipment. The water content of the first-level finished electrode piece gradually decreases or is removed during the drying process, thereby obtaining a second-level finished electrode piece with higher product performance.

[0079] In some specific embodiments of the present invention, the step of drying the first-level finished electrode piece to obtain the second-level finished electrode piece includes: step 510.

[0080] Step 510, blowing air toward the tab area 20 of the first-level finished electrode to remove the residual cleaning liquid in the tab area 20;

[0081] Specifically, Figure 5 As shown, air is blown toward the tab area 20 of the first-level finished electrode by using a blowing device. The cleaning liquid remaining in the tab area 20 can evaporate quickly during the blowing, and a larger amount of cleaning liquid can fall from the tab area 20 under the action of the gas, thereby improving the drying process of the first-level finished electrode.

[0082] The method may further include: step 520 .

[0083] Step 520: bake the first-level finished electrode to obtain the second-level finished electrode.

[0084] In detail, after the cleaning liquid remaining on the surface of the ear area 20 of the first-level finished electrode is preliminarily cleaned by blowing, the first-level finished electrode can be placed in a baking device. The first-level finished electrode can be baked as a whole by the baking device, thereby reducing or removing the moisture contained in the first-level finished electrode, thereby obtaining a second-level finished electrode with higher product performance.

[0085] According to one embodiment of the present invention, the temperature of the blowing air is 50°C to 85°C.

[0086] That is to say, the tab area 20 can be heated while blowing air. For example, the blowing temperature can be set to 50° C. to 85° C., thereby increasing the evaporation of water in the tab area 20 and achieving rapid removal of water.

[0087] In some specific embodiments of the present invention, when blowing air into the tab area 20 of a first-level finished electrode, the height of the tab area 20 is lower than the height of the main area 10 of the first-level finished electrode, and the gas is blown from the height of the main area 10 to the height of the tab area 20.

[0088] In other words, when blowing air into the lug area 20 of the first-level finished electrode, the first-level finished electrode is vertically arranged, and the lug 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 lug area 20, and the angle between the air outlet direction of the blowing equipment and the surface of the first-level finished electrode is less than 90 degrees, for example, it can be between 10 degrees and 45 degrees, thereby preventing moisture from being blown into the main body area 10 of the first-level finished electrode, and ensuring the product performance of the finished electrode.

[0089] According to one embodiment of the present invention, the semi-finished pole piece has an isolation groove 30 , and the isolation groove 30 separates the tab region 20 of the semi-finished pole piece from the dressing layer of the main region 10 .

[0090] Specifically, the semi-finished electrode sheet is provided with isolation grooves 30 on both sides of the thickness direction thereof, and the isolation grooves 30 expose the dressing layer along the current collector of the semi-finished electrode isolation grooves 30. The dressing layer of the main body area 10 can be separated from the dressing layer of the tab area 20 by the isolation grooves 30 on both sides of the semi-finished electrode sheet. When the dressing layer of the tab area 20 is immersed in the cleaning liquid, the isolation grooves 30 separate the dressing layer of the main body area 10 from the cleaning liquid, which can prevent the cleaning liquid from being adsorbed on the dressing layer of the main body area 10 and causing the dressing layer to fall off, and can ensure the yield of the finished tab preparation.

[0091] In some specific embodiments of the present invention, the width of the isolation groove 30 is 4 mm to 6 mm, thereby ensuring that the cleaning liquid will not be adsorbed to the dressing layer of the main body area 10, thereby ensuring the yield of the finished tab preparation.

[0092] According to one embodiment of the present invention, the step of preparing a semi-finished pole piece having an isolation groove 30 includes: step 310 and step 320 .

[0093] Step 310, cutting the mother sheet in the good product area to obtain the matrix of the semi-finished electrode sheet;

[0094] In detail, laser equipment or other cutting equipment is used to cut out the substrate of one or more semi-finished pole pieces in the good area of ​​the mother sheet, and the substrate of the semi-finished pole piece is separated from the other parts of the mother sheet, thereby obtaining the substrate of one or more semi-finished pole pieces.

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

[0096] Specifically, the isolation grooves 30 are cleaned on the two surfaces of the substrate in the thickness direction by laser equipment. The isolation grooves 30 penetrate the dressing layer on the surface of the substrate, so that the current collector at the location of the isolation grooves 30 is exposed, thereby obtaining at least one semi-finished pole piece with the isolation grooves 30.

[0097] In the embodiment, the equipment used for processing the isolation groove 30 and cutting the mother sheet are both laser equipment. During the processing of the semi-finished pole piece, there is no need to replace different equipment, which can effectively improve the production efficiency of the finished pole piece.

[0098] In some specific embodiments of the present invention, the step of preparing a semi-finished pole piece having an isolation groove 30 includes: step 330 and step 340 .

[0099] Step 330 , setting an isolation groove 30 on the surface of the good product area to obtain a mother wafer having the isolation groove 30 .

[0100] In detail, a laser device is used to clean one or more isolation grooves 30 on both surfaces of the good area of ​​the mother sheet in the thickness direction. The isolation grooves 30 can be determined according to actual needs. The isolation grooves 30 penetrate the dressing layer on the surface of the good area, so that the current collector at the location of the isolation grooves 30 is exposed, thereby obtaining a mother sheet with isolation grooves 30.

[0101] Step 340 , cutting the mother sheet in the good product area to obtain at least one semi-finished electrode sheet having an isolation groove 30 .

[0102] Specifically, the mother sheet is cut in the good quality area of ​​the mother sheet by using laser equipment or other cutting equipment, so as to obtain one or more semi-finished pole pieces with isolation grooves 30 .

[0103] In this embodiment, the isolation groove 30 is generated before the mother sheet is cut, that is, before the semi-finished pole sheet is separated from the mother sheet, which facilitates the processing of the isolation groove 30 on both sides of the semi-finished pole sheet and can improve the production efficiency of the finished pole sheet.

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

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

[0106] In this embodiment, the transition area between the tab area 20 and the main body area 10 is roughly trapezoidal, and the isolation groove 30 is also trapezoidal, thereby reducing the area of ​​the isolation groove 30 while meeting the needs, thereby reducing the time for setting the isolation groove 30, and further improving the production efficiency of the finished tab.

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

[0108] According to one embodiment of the present invention, the temperature of the dressing layer soaking the tab area 20 is 50°C to 80°C.

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

[0110] In some specific embodiments of the present invention, the substance used to soak the dressing layer in 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°C to 80°C. Within this temperature range, the water will not boil, which can effectively prevent the water from touching the dressing layer of the main 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 electrode; and water will not cause erosion to the collector of the electrode, thereby ensuring the product performance of the finished electrode, and facilitating the recovery of the separated dressing layer.

[0112] In addition, the cleaning liquid can also be a cleaning agent, such as an acid cleaning liquid, or other dressing cleaning liquid that does not corrode the current collector. Compared with water, the cleaning agent is more efficient in separating the dressing layer, which can improve the production efficiency of the finished electrode.

[0113] In some examples of the present invention, the ambient temperature of the main area 10 of the semi-finished electrode is the same as the temperature of the cleaning liquid, thereby avoiding the generation of water vapor and ensuring the uniformity of the cleaning liquid, thereby effectively avoiding the cleaning liquid from corroding the dressing layer of the main area 10, etc., and ensuring the product performance of the finished electrode.

[0114] It should be noted that in the present invention, the "primary" and "secondary" described in the primary finished electrode and the secondary finished electrode are only to distinguish products of different qualities, or to distinguish products obtained using different steps, and do not limit their subsequent use. They can all be used directly as final products (electrodes required for batteries).

[0115] In summary, the electrode preparation method according to the embodiment of the present invention, by determining the good area of ​​the mother sheet before cutting the mother sheet, is conducive to making full use of the good area of ​​the mother sheet, reducing the scrap rate of the mother sheet, and can effectively improve the yield of electrode production and reduce the production cost of the battery.

[0116] The embodiment of the present invention further provides a pole piece, which is obtained by the pole piece preparation method described in any of the above embodiments. Since the pole piece preparation method of the embodiment of the present invention has the above advantages, the pole piece according to the embodiment of the present invention also has corresponding advantages, which will not be described in detail in this embodiment.

[0117] The embodiment of the present invention further provides a battery, which includes the pole piece described in the above embodiment. Since the pole piece of the embodiment of the present invention has the above advantages, the battery according to the embodiment of the present invention also has corresponding advantages, which will not be described in detail in this embodiment.

[0118] The embodiment of the present invention further provides an electric device, the electric device is, for example, but not limited to, a vehicle, and the electric device includes the battery described in the above embodiment. Since the battery in the embodiment of the present invention has the above advantages, the battery in the embodiment of the present invention also has corresponding advantages, which will not be described in detail in this embodiment.

[0119] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A method for preparing a pole piece, characterized in that: The steps include: Get the master slice; Determining a good area of ​​the mother wafer; Cutting the mother sheet in the good product area to obtain at least one semi-finished electrode sheet; The dressing layer in the tab area of ​​the semi-finished electrode is removed to obtain a first-level finished electrode.

2. The method for preparing a pole piece according to claim 1, characterized in that: The method for removing the dressing layer in the tab area of ​​the semi-finished pole piece is an immersion separation method or a laser removal method.

3. The method for preparing a pole piece according to claim 1, characterized in that: The step of removing the dressing layer in the tab area of ​​the semi-finished electrode to obtain a first-level finished electrode comprises: Provide cleaning fluid; Immersing the tab area of ​​the semi-finished pole piece in a cleaning liquid and taking it out at a first preset time; The dressing layer in the tab area is separated from the semi-finished pole piece to obtain a first-level finished pole piece.

4. The method for preparing a pole piece according to claim 3, characterized in that: The step of removing the dressing layer on the surface of the semi-finished electrode piece to obtain a first-level finished electrode piece also includes: When the dressing layer in the tab area is immersed in the cleaning liquid, the cleaning liquid is vibrated.

5. The method for preparing a pole piece according to claim 3, characterized in that: The step of removing the dressing layer on the surface of the semi-finished electrode piece to obtain a first-level finished electrode piece also includes: Negative pressure is provided to extract volatiles generated by the cleaning liquid.

6. The method for preparing a pole piece according to claim 3, characterized in that: The method further comprises: The first-level finished electrode piece is dried to obtain a second-level finished electrode piece.

7. The method for preparing a pole piece according to claim 6, characterized in that: The step of drying the first-level finished electrode piece to obtain the second-level finished electrode piece comprises: Blowing air toward the tab area of ​​the first-level finished pole piece to remove the residual cleaning liquid in the tab area; And / or, baking the first-level finished electrode piece to obtain a second-level finished electrode piece.

8. The method for preparing a pole piece according to claim 7, characterized in that: The blowing temperature is 50℃~85℃.

9. The method for preparing a pole piece according to claim 7, characterized in that: When blowing air toward the tab area of ​​the first-level finished electrode sheet, the height of the tab area is lower than the height of the main body area of ​​the first-level finished electrode sheet, and the gas is blown from the height of the main body area to the height of the tab area.

10. The method for preparing a pole piece according to claim 3, characterized in that: The semi-finished pole piece has an isolation groove, and the isolation groove separates the dressing layer of the pole ear area and the main body area of ​​the semi-finished pole piece.

11. The method for preparing a pole piece according to claim 10, characterized in that: The width of the isolation groove is 4 mm to 6 mm.

12. The method for preparing a pole piece according to claim 10, characterized in that: The steps of preparing the semi-finished pole piece with the isolation groove include: Cutting the mother sheet in the good product area to obtain a substrate of a semi-finished electrode sheet; An isolation groove is arranged on the surface of the substrate to obtain at least one semi-finished pole piece.

13. The method for preparing a pole piece according to claim 10, characterized in that: The steps of preparing the semi-finished pole piece with the isolation groove include: Arranging an isolation groove on the surface of the good product area to obtain a mother wafer having the isolation groove; The mother sheet is cut in the good product area to obtain at least one semi-finished pole sheet with an isolation groove.

14. The method for preparing a pole piece according to claim 13, characterized in that: The isolation groove is a rectangular groove or a trapezoidal groove.

15. The method for preparing a pole piece according to claim 12 or 13, characterized in that: The method for generating the isolation groove is laser cleaning, and the method for cutting the mother sheet is laser cutting.

16. The method for preparing a pole piece according to claim 2, characterized in that: The temperature of the dressing layer for soaking the tab area is 50°C to 80°C.

17. The method for preparing a pole piece according to claim 2, characterized in that: The material used to soak the dressing layer in the tab area is water or a cleaning agent.

18. A pole piece, characterized in that: The pole piece is obtained by the pole piece preparation method according to any one of claims 1 to 17.

19. A battery, characterized in that: Including the pole piece as claimed in claim 18.

20. An electrical equipment, characterized in that: Comprising the battery of claim 19.

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