Electrode sheet, battery, electrical device and electrode sheet manufacturing method

Abstract

Disclosed in the present disclosure are an electrode sheet, a battery, an electrical device and an electrode sheet manufacturing method. The electrode sheet comprises an electrode sheet body and a tab located at at least one end in the width direction of the electrode sheet body. The tab comprises a first edge, a second edge and a third edge which are successively connected, the end of the first edge away from the second edge being connected to the electrode sheet body, and the end of the third edge away from the second edge being connected to the electrode sheet body. The third edge comprises a first arc section and a second arc section, and a sharp corner is formed at a joint position between the first arc section and the second arc section.

Description

Electrode, battery, electrical equipment and electrode manufacturing method

[0001] Priority information

[0002] This application claims priority and benefits of patent application No. 2023107688261 filed with the State Intellectual Property Office of China on June 27, 2023, and the entire text of which is incorporated herein by reference. Technical Field

[0003] The present disclosure belongs to the field of battery technology, and particularly relates to a pole piece, a battery, an electrical device, and a pole piece manufacturing method. Background Art

[0004] In the cell structure of a lithium-ion battery, the tabs are the metal conductors that connect the positive and negative electrodes to the cell. A complete tab is primarily composed of an insulating sealant and a metal conductive matrix. The tab material, size, and tab connection method significantly impact the rate discharge and cycling performance of a lithium-ion battery. Generally speaking, the current flowing through the conductor is proportional to the cross-sectional area of ​​the conductor: a larger conductor cross-sectional area allows for greater current flow. The tab size is determined not only by the battery model but also by the battery's required maximum discharge current. Therefore, the tab's shape plays a crucial role in the battery's construction.

[0005] Existing tab structures can be torn by cutting waste, causing deformation or damage during cutting. This affects the tab's current capacity and consistency, and in severe cases, can render the tab scrapped. Existing tab cutting methods also limit the equipment's operating speed. When the equipment's operating speed exceeds 100 m / min, there is a risk of cutting limitations, as the laser trajectory cannot match the equipment's operating speed.

[0006] Public content

[0007] The present disclosure aims to address, at least to some extent, one of the technical problems in the related art. To this end, the present disclosure provides a pole piece, a battery, an electrical device, and a pole piece manufacturing method. The present disclosure ensures the integrity of the pole tab shape, the maximum current allowed to flow through the tab, and the charge and discharge efficiency of the lithium-ion battery.

[0008] In one aspect of the present disclosure, a pole piece is provided. According to an embodiment of the present disclosure, the pole piece includes a pole piece body and a pole lug located at at least one end of the pole piece body in a width direction. The pole lug includes a first edge, a second edge, and a third edge connected in sequence. The end of the first edge remote from the second edge is connected to the pole piece body, and the end of the third edge remote from the second edge is connected to the pole piece body. The third edge includes a first arc segment and a second arc segment, and the first arc segment and the second arc segment form a sharp angle at their connection.

[0009] According to the pole piece of the embodiment of the present disclosure, a sharp corner (i.e., the intersection of the cutting trajectory) is set at the connection between the first arc segment and the second arc segment of the third edge of the pole tab, that is, the cutting end point of a cutting cycle is set in the relatively middle area of ​​the pole tab edge, avoiding the problem of setting the cutting end point in the end area of ​​the pole tab edge, which easily leads to the tearing and folding of the pole tab, and can meet the cutting stability of the laser during high-speed cutting, thereby ensuring the integrity of the pole tab shape, ensuring the maximum current allowed to pass through the pole tab, and ensuring the charging and discharging efficiency of the lithium-ion battery.

[0010] In another aspect of the present disclosure, a method for manufacturing a pole piece is provided. According to an embodiment of the present disclosure, the method includes:

[0011] (1) Providing a pole piece substrate, the pole piece substrate comprising a pole piece body region and a pole tab region located on one side of the pole piece body region in a width direction, and using a laser to cut from one end of the pole tab region away from the pole piece body region toward the pole piece body region until the pole piece body region is located, thereby forming a first edge;

[0012] (2) using a laser to cut a preset size along the length direction of the electrode substrate from the cutting end point of step (1);

[0013] (3) using a laser to perform arc cutting from the cutting end point of step (2) in a direction away from the pole piece body area to a preset position to form a second arc segment;

[0014] (4) using a laser to perform arc cutting from one end of the pole tab region away from the pole piece body region toward the direction of the cutting end point of step (3) until it intersects with the cutting trajectory of step (3), forming a first arc segment, and forming a sharp angle at the connection between the first arc segment and the second arc segment;

[0015] The cutting starting point in step (1) and the cutting starting point in step (4) are spaced apart by a preset size along the length direction of the electrode substrate.

[0016] According to the method for making pole pieces in the embodiment of the present disclosure, the cutting end point of a cycle is set in the relatively middle area of ​​the edge of the pole ear, avoiding the problem of setting the cutting end point in the end area of ​​the edge of the pole ear, which is easy to cause the pole ear to tear and fold, thereby ensuring the integrity of the shape of the pole ear, ensuring the maximum current allowed to pass through the pole ear, and ensuring the charging and discharging efficiency of the lithium-ion battery.

[0017] In a third aspect of the present disclosure, a battery is provided. According to an embodiment of the present disclosure, the battery comprises a pole piece according to the above embodiment or a pole piece cut using the method described in the above embodiment, thereby ensuring the battery's charge and discharge efficiency.

[0018] In a fourth aspect of the present disclosure, an electrical device is provided. According to an embodiment of the present disclosure, the electrical device comprises the battery described above. Thus, the electrical device has all the advantages of the battery, which will not be elaborated here.

[0019] Additional aspects and advantages of the present disclosure will be given in part in the description that follows and, in part, will be obvious from the description that follows, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0021] FIG1 is a schematic structural diagram of a pole piece in the prior art;

[0022] FIG2 is a schematic diagram of a cutting path for cutting a pole piece in the prior art

[0023] FIG3 is a schematic structural diagram of a pole piece according to an embodiment of the present disclosure;

[0024] FIG4 is an enlarged schematic diagram of a portion (portion P) of FIG3 ;

[0025] FIG5 is a schematic diagram of a cutting path and a laser path for cutting a pole piece according to an embodiment of the present disclosure.

[0026] The accompanying drawings are marked as follows: 100 - pole ear, 101 - first region, 102 - second region, 103 - first edge, 104 - second edge, 105 - third edge, 105 - 1 - first arc segment, 105 - 2 - second arc segment, 200 - pole piece body, 100' - pole ear region, 200' - pole piece body region. DETAILED DESCRIPTION

[0027] The embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be understood as limiting the present disclosure.

[0028] In one aspect of the present disclosure, a pole piece is provided. According to an embodiment of the present disclosure, with reference to Figures 3 and 4, the pole piece includes a pole piece body 200 and a pole tab 100 located at at least one end of the pole piece body 200 in the width direction (i.e., the Y direction), the pole tab 100 includes a first edge 103, a second edge 104, and a third edge 105 connected in sequence, the first edge 103 being connected to the pole piece body 200 at an end away from the second edge 104, and the third edge 105 being connected to the pole piece body 200 at an end away from the second edge 104; the third edge 105 includes a first arc segment 105-1 and a second arc segment 105-2, and the connection between the first arc segment 105-1 and the second arc segment 105-2 forms a sharp angle. Therefore, the present invention sets a sharp corner (i.e., the intersection of the cutting trajectory) at the connection between the first arc segment 105-1 and the second arc segment 105-2 of the third edge 105 of the pole tab, that is, the cutting end point of a cutting cycle is set in the relatively middle area of ​​the pole tab edge, avoiding the problem of setting the cutting end point in the end area of ​​the pole tab edge, which easily leads to the tearing and folding of the pole tab, and can meet the cutting stability of the laser during high-speed cutting, thereby ensuring the integrity of the pole tab shape, ensuring the maximum current allowed to pass through the pole tab, and ensuring the charging and discharging efficiency of the lithium-ion battery.

[0029] The following is a detailed description of the principle by which the electrode proposed in this disclosure can achieve the above beneficial effects:

[0030] Referring to FIG1 , a conventional pole piece has a tab with smooth curved surfaces (i.e., first edge 103 and third edge 105) along its length (i.e., the X-direction). Neither of these smooth curved surfaces has sharp corners, meaning there are no intersections between cutting paths. However, the tab structure shown in FIG1 cannot meet the cutting stability requirements of lasers during high-speed cutting. Specifically, the cutting method of the electrode structure shown in Figure 1 includes the following steps, which can be referred to in Figure 2: a) providing a electrode substrate, the electrode substrate including a electrode body region 200' and a pole ear region 100' located on one side of the width direction (i.e., the Y direction) of the pole piece body region 200', and using a laser to cut from one end of the pole ear region 100' away from the pole piece body region 200' in the direction of the pole piece body region 200', until the pole piece body region 200' is located, forming a first edge 103, as shown in path 1 in Figure 2; b) using a laser to cut a preset size along the length direction (i.e., the X direction) of the pole piece substrate from the cutting end point of step a), as shown in path 2 in Figure 2; c) using a laser to perform arc cutting from the cutting end point of step b) in the direction away from the pole piece body region 200', until the top of the pole ear region 100', forming a third edge 105, As shown in path 3 in FIG2 , the starting point of cutting in step a) and the ending point of cutting in step c) are separated by a predetermined distance along the length of the electrode substrate; at this point, the first waste material between adjacent tabs is cut away. Steps a) through c) are repeated a second time to form the first tab on the electrode substrate. Steps a) through c) are repeated a third time to form the second tab on the electrode substrate, and this process is repeated until all tabs on the electrode substrate are cut away. However, during the tab cutting process, the direction of motion of the electrode substrate under the action of the conveyor belt is different from the direction of motion of the waste material being cut away, and the relative speed between the electrode substrate and the waste material is very high. Therefore, in step c), when the top of the electrode substrate is about to be cut, the electrode substrate and the waste material to be cut away are easily torn at the top of the tab (i.e., the edge of the tab) due to the different directions of motion, resulting in an incomplete shape of the tab formed by the cut, thereby affecting the current carrying capacity and consistency of the tab, and thus the charge and discharge efficiency of the lithium-ion battery. In addition, in step c), when the top of the electrode substrate is almost cut, the shaking or fluctuation of the equipment may also cause the top of the tab to be torn, resulting in an incomplete shape of the tab formed by cutting.

[0031] In order to solve the above problems, the present disclosure provides a new pole piece. Referring to Figures 3 and 4, the pole piece structure can be adapted to the cutting method of the present disclosure. A cutting trajectory intersection (i.e., a double arc sharp angle) is set at the connection between the first arc segment 105-1 and the second arc segment 105-2 of the third edge 105 of the pole tab, and the cutting end point of a cycle is set in the relatively middle area of ​​the pole tab edge, avoiding the problem of easily causing the pole tab to be torn due to setting the cutting end point in the end area of ​​the pole tab edge, and can meet the cutting stability of the laser during high-speed cutting, thereby ensuring the integrity of the pole tab shape, ensuring the maximum current allowed to pass through the pole tab, and ensuring the charging and discharging efficiency of the lithium-ion battery. Specifically, referring to FIG5, the above-mentioned electrode cutting method includes: S100: providing a electrode substrate, the electrode substrate including a electrode body region 200' and a pole ear region 100' located on one side of the width direction of the pole body region 200', using a laser to cut from one end of the pole ear region 100' away from the pole body region 200' in the direction of the pole body region 200', until the pole body region 200' is located, forming a first edge 103, as shown in path 1 in FIG5; S200: using a laser to cut a preset size along the length direction of the pole substrate from the cutting end point of step S100, as shown in FIG5 As shown in the path 2 in FIG5 ; S300: using a laser to perform arc cutting of a preset size from the cutting end point of step S200 in the direction away from the pole piece body area 200', forming a second arc segment 105-2, as shown in the path 3 in FIG5 ; S400: using a laser to perform arc cutting from one end of the pole tab area 100' away from the pole piece body area 200' in the direction of the cutting end point of step S300, until it intersects with the cutting trajectory of step S300, forming a first arc segment 105-1, and a sharp angle is formed at the connection between the first arc segment 105-1 and the second arc segment 105-2, as shown in the path 4 in FIG5 . The present disclosure divides step c) in the prior art into two steps for cutting, that is, after step S300 cuts to the preset position, the laser is turned off, and then the laser cut is moved to the top of the pole tab area 100', and arc cutting is performed in the direction of the cutting end point of step S300 until it intersects with the cutting trajectory of step S300. The above-mentioned cutting method sets the cutting end point of a cycle at a relatively middle area of ​​the edge of the tab, thereby avoiding the problem of easily causing the tab to be torn when the cutting end point is set at the end area of ​​the edge of the tab.

[0032] According to some specific embodiments of the present disclosure, the tab 100 includes a first region 101 and a second region 102, the second region 102 is arranged on one side in the width direction of the first region 101, and the side of the second region 102 away from the first region 101 is connected to the pole piece body, and at least part of the surface of the second region 102 is provided with an active material layer, thereby further improving the overall charge and discharge capacity of the battery.

[0033] In an embodiment of the present disclosure, the sharp corner formed at the connection between the first arc segment 105 - 1 and the second arc segment 105 - 2 can be set at the edge of the first area 101 or at the edge of the second area 102 , preferably at the edge of the second area 102 .

[0034] According to some specific embodiments of the present disclosure, the sharp corner formed at the connection between the first arc segment 105-1 and the second arc segment 105-2 is set at the edge of the second region 102. Referring to Figures 3 and 4, the first arc segment 105-1 is set at the edge of the first region 101 and extends to the edge of the second region 102, and the second arc segment 105-2 is set at the edge of the second region 102. The first arc segment 105-1 and the second arc segment 105-2 intersect at the edge of the second region 102, that is, the sharp corner is set at the edge of the second region 102. Since the surface of the second region 102 is provided with an active material layer with a thickness of about 80-120 microns and a relatively high hardness, when the sharp corner (i.e., the cutting end point) is set on the second region 102, the tab tearing phenomenon at the cutting end point is better avoided.

[0035] Furthermore, as shown above, since the surface of the second region 102 is provided with an active material layer, the thickness of which is about 80-120 microns and its hardness is relatively large, the sharp corner (i.e., the cutting end point) can be a certain distance away from the end of the second region 102 close to the pole piece body. As some specific examples, the dimension h2 of the second arc segment 105-2 along the Y direction is not less than 2 mm.

[0036] According to some further specific embodiments of the present disclosure, the second arc segment 105-2 is arranged at the edge of the second region 102 and extends to the edge of the first region 101, the first arc segment 105-1 is arranged at the edge of the first region 101, the first arc segment 105-1 and the second arc segment 105-2 intersect at the edge of the first region 101, and the sharp corner is formed at the edge of the first region 101. Furthermore, the dimension h1 of the first arc segment 105-1 along the Y direction is not less than 5 mm. Thus, the distance between the sharp corner (i.e., the cutting end point) and the end of the tab is further ensured, that is, the cutting end point of a cutting cycle is ensured to be set at a relatively middle area of ​​the tab arc surface, further avoiding the problem of the tab being easily torn due to setting the cutting end point at the end area of ​​the tab arc surface.

[0037] According to some further specific embodiments of the present disclosure, referring to FIG4 , the angle α between the first arc segment 105-1 and the second arc segment 105-2 is in the range of 90 degrees < α < 180 degrees (for example, it can be 100 / 110 / 120 / 130 / 140 / 150 / 160 / 170 degrees), that is, the angle α between the tangent through the final cutting point of the first arc segment 105-1 and the tangent through the final cutting point of the second arc segment 105-2 is in the range of 90 degrees < α < 180 degrees. This cutting arc is easier to implement, that is, the pole piece of this structure is easier to implement in the laser preparation process.

[0038] In an embodiment of the present disclosure, the width of the first region 101 and the width of the second region 102 can be set according to different requirements of different types of batteries for the tabs. As some specific examples, the ratio of the width of the first region 101 to the width of the second region 102 is 5:(1-2).

[0039] In the embodiment of the present disclosure, the shapes of the two top corners of the first area 101 away from the second area 102 are not particularly limited, and those skilled in the art can set them according to actual needs. For example, the top of the first area 101 can be cut at a right angle, an R angle, or an oblique angle.

[0040] In a second aspect of the present disclosure, a method for manufacturing the pole piece of the above embodiment is proposed. According to the embodiment of the present disclosure, with reference to FIG5 , the above method includes:

[0041] S100: Providing a pole piece substrate, the pole piece substrate including a pole piece body region 200' and a pole tab region 100' located on one side of the pole piece body region 200' in a width direction, using a laser to cut from an end of the pole tab region 100' away from the pole piece body region 200' toward the pole piece body region 200' until the pole piece body region 200' is formed, forming a first edge 103, as shown in path 1 in FIG5 ;

[0042] S200: Using laser to cut the electrode substrate into a preset size along the length direction from the cutting end point of step S100, as shown in path 2 in FIG5 ;

[0043] In this step, the preset size is cut along the length direction of the pole piece substrate according to the pre-design.

[0044] S300: Using a laser to perform arc cutting from the cutting end point of step S200 in a direction away from the pole piece body region 200' to a preset position, forming a second arc segment 105-2, as shown by path 3 in FIG5;

[0045] After cutting to the preset position in step S300, the laser is turned off, and then the laser cutter is moved to the top of the electrode substrate. The movement trajectory of the laser is shown as 3' in Figure 5. The cutting end point in step S300 can be located in the relatively middle area of ​​the second area or the relatively middle area of ​​the first area, thereby avoiding the problem of the electrode tab being torn due to setting the cutting end point at the end area of ​​the edge of the electrode tab.

[0046] The preset position in this step may be in a relatively middle area of ​​the first area or in a relatively middle area of ​​the second area.

[0047] S400: Using a laser, arc cutting is performed from the end of the tab region 100' away from the pole piece body region 200' in the direction of the cutting end point of step S300 until it intersects with the cutting trajectory of step S300, forming a first arc segment 105-1. The connection between the first arc segment 105-1 and the second arc segment 105-2 forms a sharp angle, as shown by path 4 in FIG5;

[0048] In this step, the cutting starting point in step S100 is spaced from the cutting starting point in step S400 by a preset size, and the preset size is the size of the waste material to be cut off. At this time, the first waste material between adjacent pole tabs is cut off. Steps S100-S400 are repeated in sequence for the second time to form the first pole tab on the pole piece substrate. Steps S100-S400 are repeated in sequence for the third time to form the second pole tab on the pole piece substrate. This is repeated until all pole tabs on the pole piece substrate are cut off. In the embodiment of the present disclosure, the size of the waste material to be cut off and the size of the pole tab formed by cutting can be set according to actual needs. It should be noted that the side of the formed pole tab away from the pole piece body is the second edge 104.

[0049] The present disclosure divides step c) in the prior art into two steps for cutting, namely, after cutting to a preset position in step S300, the laser is turned off, and then the laser cut is moved to the end of the tab area 100' away from the pole piece body area 200', and arc cutting is performed in the direction of the cutting end point of step S300 until it intersects with the cutting trajectory of step S300. The cutting method of the present disclosure sets the cutting end point of a cycle in the relatively middle area of ​​the tab edge, avoiding the problem of the tab being easily torn due to setting the cutting end point in the end area of ​​the tab edge, thereby ensuring the integrity of the tab shape, ensuring the maximum current allowed to pass through the tab, and ensuring the charging and discharging efficiency of the lithium-ion battery.

[0050] At the same time, the existing cutting method also limits the operating speed of the equipment. When the operating speed of the equipment is greater than 100m / min, the tab tearing will be so serious that the cutting process cannot proceed normally, and the laser trajectory cannot match the operating speed of the equipment. The present disclosure avoids the problem of tab tearing caused by setting the cutting end point of a cycle in the relatively middle area of ​​the edge of the tab, thereby increasing the laser cutting speed while avoiding tab tearing, so as to meet the tab cutting requirements under high-speed conditions of the equipment. As some specific examples, the cutting speeds of the laser in step S100, step S200, step S300 and step S400 are each independently 80-200m / min (for example, 80 / 100 / 120 / 140 / 160 / 180 / 200m / min, etc.).

[0051] In addition, the present disclosure can complete the cutting with one laser machine. Compared with the solution of using two laser machines, the present disclosure reduces the cost while ensuring the integrity of the tab shape during the cutting process.

[0052] In the embodiment of the present disclosure, since the width of the tab region 100 ′ of the electrode substrate is equal to the width of the tab obtained by cutting, no waste edge in the width direction is generated in the cutting method.

[0053] In an embodiment of the present disclosure, after cutting is completed, a plurality of tabs may be formed on the electrode substrate, and the plurality of tabs may be overlapped after a winding and lamination process.

[0054] In a third aspect of the present disclosure, a battery is provided. According to an embodiment of the present disclosure, the battery comprises a pole piece according to the above embodiment or a pole piece cut using the method described in the above embodiment, thereby ensuring the battery's charge and discharge efficiency.

[0055] Specifically, the positive electrode sheet of the battery can adopt the electrode sheet described in the above embodiment, the negative electrode sheet of the battery can adopt the electrode sheet described in the above embodiment, and both the positive electrode sheet and the negative electrode sheet of the battery can adopt the electrode sheet described in the above embodiment.

[0056] In a fourth aspect of the present disclosure, an electrical device is provided. According to an embodiment of the present disclosure, the electrical device includes a battery as described above. Thus, the electrical device has all the advantages of a battery, which will not be described in detail here.

[0057] Specifically, the electrical devices may include, but are not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery-powered vehicles, electric cars, ships, spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0059] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A pole piece, wherein: The pole piece comprises a pole piece body and a pole ear located at at least one end of the pole piece body in the width direction, the pole ear comprises a first edge, a second edge and a third edge connected in sequence, an end of the first edge away from the second edge is connected to the pole piece body, and an end of the third edge away from the second edge is connected to the pole piece body; The third edge includes a first arc segment and a second arc segment, and a sharp angle is formed at a connection between the first arc segment and the second arc segment.

2. The pole piece according to claim 1, wherein: The pole lug includes a first region and a second region, wherein the second region is arranged on one side in the width direction of the first region, and a side of the second region away from the first region is connected to the pole piece body, and an active material layer is provided on at least part of the surface of the second region.

3. The pole piece according to claim 2, wherein: The first arc segment is arranged at the edge of the first area and extends to the edge of the second area, the second arc segment is arranged at the edge of the second area, and the sharp corner is formed at the edge of the second area.

4. The pole piece according to claim 2, wherein: The second arc segment is arranged at the edge of the second area and extends to the edge of the first area, the first arc segment is arranged at the edge of the first area, and the sharp corner is formed at the edge of the first area.

5. The pole piece according to any one of claims 1 to 4, wherein: The range of the angle α between the first arc segment and the second arc segment is 90 degrees<α<180 degrees.

6. The pole piece according to any one of claims 2 to 5, wherein: The ratio of the width of the first region to the width of the second region is 5:(1-2).

7. A method for manufacturing a pole piece according to any one of claims 1 to 6, wherein: include: (1) providing a pole piece substrate, the pole piece substrate comprising a pole piece body region and a pole ear region located on one side of the pole piece body region in a width direction, and using a laser to cut from one end of the pole ear region away from the pole piece body region toward the direction of the pole piece body region until the pole piece body region is reached to form a first edge; (2) using a laser to cut a preset size along the length direction of the electrode substrate from the cutting end point of step (1); (3) using a laser to perform arc cutting from the cutting end point of step (2) in a direction away from the pole piece body area to a preset position to form a second arc segment; (4) using a laser to perform arc cutting from one end of the pole ear region away from the pole piece body region toward the direction of the cutting end point of step (3) until it intersects with the cutting trajectory of step (3) to form a first arc segment, and a sharp angle is formed at the connection between the first arc segment and the second arc segment; The distance between the cutting starting point in step (1) and the cutting starting point in step (4) along the length direction of the electrode substrate is preset sizes.

8. The method according to claim 7, wherein: The laser cutting speeds in step (1), step (2), step (3) and step (4) are each independently 80 m / min-200 m / min.

9. The method according to claim 7 or 8, wherein: The width of the tab region is equal to the width of the tab obtained by cutting.

10. A battery, wherein: A pole piece according to any one of claims 1 to 6 or a pole piece made by the method according to any one of claims 7 to 9.

11. An electrical device, wherein: A battery according to claim 10.

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