Pole piece, electrochemical device, and electronic device

Abstract

The utility model relates to electrochemical energy storage technical field discloses a kind of pole piece, electrochemical device and electronic equipment, pole piece includes current collector, active layer and first insulating coating, current collector includes current collector body and tab, tab extends from the edge of current collector body to outside side;At least one surface of tab along the thickness direction includes first area, and first area is connected to the edge of current collector body;At least one surface of current collector body along the thickness direction is coated with active layer;First insulating coating is coated in first area, and is connected to active layer, so as to be able to improve the problem of active layer powdering.

Description

Technical Field

[0001] This utility model relates to the field of electrochemical energy storage technology, and in particular to electrode sheets, electrochemical devices, and electronic equipment. Background Technology

[0002] With the continuous development of lithium-ion battery technology, people have higher and higher requirements for the performance of lithium batteries. Safety accidents caused by thermal runaway of lithium-ion batteries are increasing year by year. Therefore, how to ensure the safety performance of lithium-ion batteries is one of the important research directions for batteries in the future.

[0003] Currently, during the die-cutting process of electrode sheets, the tabs are prone to bending or deformation, which can cause powder to fall off at the edge of the active material layer opposite to the tab. These powder particles can easily cause short circuits in lithium-ion batteries and trigger thermal runaway. Utility Model Content

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an electrode sheet that can improve the problem of powder shedding from the active layer.

[0005] This application also proposes an electrochemical device having the above-mentioned electrodes, and an electronic device having the electrochemical device.

[0006] An electrode sheet according to a first aspect embodiment of the present application includes a current collector, an active layer, and a first insulating coating. The current collector includes a current collector body and an electrode tab, the electrode tab extending outward from the edge of the current collector body. At least one surface of the electrode tab along the thickness direction includes a first region, the first region being connected to the edge of the current collector body. At least one surface of the current collector body along the thickness direction is coated with the active layer. The first insulating coating is coated on the first region and connected to the active layer.

[0007] The electrode sheet according to the embodiments of this application has at least the following beneficial effects: by providing a first region on at least one surface of the tab along the thickness direction, the first region being connected to the edge of the current collector body, a first insulating coating being applied to the first region, and the first insulating coating being connected to the active layer, the first insulating coating can increase the thickness and structural strength of the tab in the first region, and the first insulating coating can support the edge of the active layer, thereby improving the problem of powder shedding at the edges of the active layer and the tab. When the electrode sheet is applied to an electrochemical device, it can reduce the number of free powder particles in the electrochemical device, reduce the short circuit in the electrochemical device during cycling, and thus reduce problems such as thermal runaway, thereby improving the safety performance of the electrochemical device.

[0008] In some embodiments, the first region is provided with a plurality of first grooves and / or a plurality of first protrusions.

[0009] In some embodiments, the current collector body has an active layer coated on both opposite surfaces along the thickness direction; the tab has a first region on both opposite surfaces along the thickness direction, and each first region is coated with a first insulating coating; and / or, the first region extends along the width direction of the tab to the edge of at least one side of the tab.

[0010] In some embodiments, the surface of the current collector includes a central region and an edge region, the edge region being arranged in a ring around the central region, and a first region being connected to the edge region; an active layer is coated on the central region; the electrode further includes a second insulating coating, which is coated on the edge region and connected to the first insulating coating and the active layer respectively.

[0011] In some embodiments, the electrode further includes a conductive element; the surface of the electrode tab further includes a second region connected to the side of the first region away from the current collector body, and the conductive element is connected to the second region; a receiving groove is formed between the conductive element and the active layer, and a first insulating coating is disposed in the receiving groove.

[0012] In some embodiments, the conductive element includes a first segment and a second segment connected to each other, the second segment being stacked and connected to a second region; the first segment being stacked on the side of the second segment opposite to the second region and extending toward the side away from the first region.

[0013] In some embodiments, the first insulating coating is a ceramic coating; or, the first insulating coating includes a ceramic coating and an adhesive layer, the adhesive layer being bonded between the first region and the ceramic coating, and the adhesive layer and / or the ceramic coating being connected to the active layer.

[0014] In some embodiments, the thickness of the first insulating coating is ≥20 micrometers and ≤35 micrometers; and / or, along the direction from the current collector body to the tab, the length of the first insulating coating is ≥0.5 millimeters and ≤1.9 millimeters.

[0015] An electrochemical device according to a second aspect of this application includes the electrode from any of the above embodiments.

[0016] An electronic device according to a third aspect of this application includes the electrochemical device described in the above embodiments.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The embodiments described in this application are not limited to the accompanying drawings, which are only some of the embodiments described herein. Those skilled in the art can obtain drawings of other embodiments based on the content of this application.

[0019] Figure 1A schematic diagram of the electrode structure provided in an embodiment of this application is shown; Figure 2 A schematic diagram of the cross-sectional structure of the electrode provided in an embodiment of this application is shown; Figure 3 A schematic diagram of the structure of an electrode sheet provided in another embodiment of this application is shown; Figure 4 A cross-sectional structural diagram of an electrode sheet provided in another embodiment of this application is shown; Figure 5 A cross-sectional structural diagram of an electrode sheet provided in another embodiment of this application is shown.

[0020] Figure label: Electrode 100; Current collector 110; Current collector body 111; Middle region 1111; Edge region 1113; Tab 113; First region 1131; Second region 1133; Active layer 130; First insulating coating 150; Second insulating coating 170; Conductive element 190; First segment 191; Second segment 193; Length direction X; Width direction Y; Thickness direction Z. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0025] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] This application provides an electronic device, which includes an electrochemical device. The electronic device in this application is not particularly limited and can be any electronic device known in the prior art.

[0027] The electronic devices described in this application are not particularly limited in their application and can be used with any electronic device known in the prior art. These electronic devices include, but are not limited to, mobile phones, smartphones, laptops, tablets, wearable devices, smartwatches, smart bracelets, smart glasses, power banks, televisions, game consoles, game controllers, digital cameras, smart speakers, headphones, keyboards, mice, monitors, drones, audio equipment, home appliances, toys, power tools, automobiles, motorcycles, electric bicycles, bicycles, robots, robotic dogs, industrial robots, and android robots.

[0028] In some embodiments, the electrochemical device includes any device in which an electrochemical reaction occurs to interconvert chemical energy and electrical energy, and specific, non-limiting examples include all types of primary batteries, secondary batteries, fuel cells, solar cells, or capacitors. In particular, the electrochemical device is a lithium secondary battery, including lithium metal secondary batteries, lithium-ion secondary batteries, lithium polymer secondary batteries, or lithium-ion polymer secondary batteries.

[0029] Please see Figure 1 In some embodiments, the electrochemical device includes a housing and a battery cell located within the housing. The battery cell includes a separator and two electrodes 100 with opposite polarities. The separator is located between the two electrodes 100 to isolate them. One of the two electrodes 100 is a positive electrode, and the other is a negative electrode.

[0030] The battery cell can be a wound cell or a laminated cell. The specific structure can be referred to the existing technology, and will not be described in detail here.

[0031] The following explanation will take one of the electrodes, 100, as an example.

[0032] Please see Figures 1 to 2 In some embodiments, the electrode 100 includes a current collector 110, an active layer 130, and a first insulating coating 150. The current collector 110 includes a current collector body 111 and a tab 113.

[0033] Among them, current collector 110 can refer to a conventional current collector (i.e., current collector 110 is a single-layer metal foil, such as...). Figure 2 As shown) Current collector 110 can also refer to composite current collector (such as... Figure 5 (As shown), this application is not limited.

[0034] The tab 113 extends outward from the edge of the current collector 111 for direct or indirect connection to an external circuit via a conductive structure.

[0035] At least one surface of the current collector 111 along the thickness direction Z is coated with an active layer 130, which is an active material coating.

[0036] At least one surface of the tab 113 along the thickness direction Z includes a first region 1131. The first region 1131 is connected to the edge of the current collector 111. A first insulating coating 150 is coated on the first region 1131 and is connected to the active layer 130. Thus, the first insulating coating 150 can increase the thickness and structural strength of the tab 113 in the first region 1131, and can support the edge of the active layer 130. This helps to improve the problem of powder shedding at the opposite edges of the active layer 130 and the tab 113. When the electrode 100 is applied to an electrochemical device, it can reduce the number of free powder particles in the electrochemical device, reduce the occurrence of poor high-voltage withstand tests, reduce the occurrence of short circuits during cycling, and thus reduce problems such as thermal runaway, thereby improving the safety performance of the electrochemical device.

[0037] Specifically, in existing technologies, because the surface of the current collector is coated with an active layer, the active layer increases the thickness and structural strength of the current collector. The structural strength of the current collector is significantly better than that of the tab. During the die-cutting process, the tab is prone to bending or deformation, which leads to a serious problem of powder shedding at the edges of the active layer and the tab. For example, when the electrode is a negative electrode, carbon powder particles (such as graphite, silicon-based powder particles) are prone to fall off at the edges of the active layer; when the electrode is a negative electrode, lithium, nickel, cobalt, manganese, and other powder particles are prone to fall off at the edges of the active layer. These powder particles can easily cause short circuits in lithium-ion batteries directly or indirectly (such as powder particles piercing the separator, causing a short circuit between the positive and negative electrodes), leading to thermal runaway of lithium-ion batteries. In this embodiment, the area where the tab 113 is connected to the current collector 111 is coated with a first insulating coating 150. The first insulating coating 150 can increase the thickness and structural strength of the tab 113 and support the active layer 130, thereby improving the problem of powder shedding at the edges of the active layer 130 and the tab 113, and thus improving the problem of thermal runaway of the electrochemical device.

[0038] The first insulating coating 150 is connected to the active layer 130. This can mean that the first insulating coating 150 is directly connected to the active layer 130, or that the first insulating coating 150 is indirectly connected to the active layer 130 through other structures. When the first insulating coating 150 is applied, it can partially penetrate into the active layer 130. After the first insulating coating 150 cures, it can adsorb and fix the particles inside the active layer 130, which helps to further improve the problem of powder shedding from the active layer 130.

[0039] Understandably, in some embodiments, the first insulating coating 150 may be a ceramic coating to improve the heat resistance and mechanical strength of the first insulating coating 150, which helps to more stably support the active layer 130.

[0040] The composition of the ceramic coating can be flexibly set according to the actual situation.

[0041] As an example, the ceramic coating can be made of a mixture of materials such as adhesives and ceramic powders. The adhesive can be one or a mixture of more than one of styrene-butadiene rubber (SBR), sodium alginate (SA), sodium carboxymethyl cellulose (CMC), etc., and the ceramic powder can be one or a mixture of more than one of alumina, zirconium oxide, silicon carbide, etc.

[0042] In some embodiments, the first insulating coating 150 may include a ceramic coating and an adhesive layer.

[0043] The adhesive layer can be bonded between the first region 1131 and the ceramic coating, so that the ceramic coating can be bonded to the first region 1131 through the adhesive layer, which helps to improve the bonding strength between the ceramic coating and the first region 1131.

[0044] An adhesive layer and / or ceramic coating may be attached to the active layer 130 to support the active layer 130.

[0045] In some other embodiments, the first insulating coating 150 may be an adhesive layer to reduce the manufacturing cost of the electrode 100.

[0046] The adhesive layer can be an organosilane adhesion promoter, an organotitanic acid adhesion promoter, a zircon adhesion promoter, a zirconium aluminate adhesion promoter, an alkyl phosphate, a mixture of aluminum powder and adhesive, or other adhesive layers.

[0047] It should be noted that the ceramic coating can be entirely attached to the surface of the adhesive layer, that is, the adhesive layer can separate the first region 1131 and the ceramic coating so that the ceramic coating and the first region 1131 are spaced apart; or, the ceramic coating can be partially attached to the surface of the adhesive layer and partially attached to the first region 1131.

[0048] In some embodiments, along the thickness direction Z of the electrode 100, the projected area of ​​the adhesive layer in the first region 1131 can be ≥ 30% of the projected area of ​​the ceramic coating in the first region 1131 and ≤ 100% of the projected area of ​​the ceramic coating in the first region 1131, thereby ensuring that the adhesive layer has a sufficiently large bonding area between the ceramic coating and the first region 1131 to improve the bonding strength between the ceramic coating and the first region 1131.

[0049] In some embodiments, the first region 1131 is provided with a plurality of first grooves and / or a plurality of first protrusions. In this way, the first insulating coating 150 can be connected to the inner wall of each first groove and / or the outer surface of each first protrusion, thereby increasing the contact area between the first insulating coating 150 and the first region 1131. The inner wall of the first groove and / or the outer surface of each first protrusion can limit the displacement of the first insulating coating 150 under force, improve the connection strength of the first insulating coating 150 in the first region 1131, reduce the possibility of the first insulating coating 150 falling off, and help the first insulating coating 150 to support the active layer 130 more stably.

[0050] As an example, taking the first region 1131 as having a plurality of first grooves, the first insulating coating 150 may have a plurality of outward protrusions on the outer wall facing the first region 1131, and each first groove may have a protrusion to increase the contact area between the first insulating coating 150 and the first region 1131.

[0051] As another example, taking the first region 1131 as having a number of first protrusions, the first insulating coating 150 can be recessed on the outer wall facing the first region 1131 with a number of receiving grooves, and each first protrusion can be protruded into a receiving groove to increase the contact area between the first insulating coating 150 and the first region 1131.

[0052] It should be noted that when the first region 1131 is provided with a plurality of first grooves and a plurality of first protrusions, each first groove can be formed by a plurality of first protrusions, where "a plurality of" can refer to two or more. Understandably, each receiving groove can also be formed by a plurality of outward protrusions.

[0053] Both the first groove and the first protrusion can be formed in the first region 1131 by laser processing, embossing, or other processes.

[0054] The shape of the first groove can be flexibly set according to requirements.

[0055] As an example, the first groove can be circular, prismatic, elliptical, or other shapes.

[0056] The shape of the first protrusion can also be flexibly set according to requirements.

[0057] As an example, the first protrusion can be cylindrical, prismatic, elliptical, or other shapes.

[0058] In some embodiments, the current collector 111 has two opposite surfaces coated with an active layer 130 along the thickness direction Z, and the tab 113 has two opposite surfaces along the thickness direction Z, each including a first region 1131. Each first region 1131 is connected to the edge of the current collector 111, and each first region 1131 is coated with a first insulating coating 150. Each first insulating coating 150 is connected to the active layer 130 coated on the two opposite surfaces of the current collector 111, thereby further increasing the thickness and structural strength of the tab 113. Furthermore, the active layers 130 on both opposite sides of the current collector 111 are supported by a first insulating coating 150, which helps to improve the problems of powder shedding and decarburization of the active layers 130 on both opposite sides of the current collector 111, and further enhances the safety of the electrochemical device.

[0059] It should be noted that each first region 1131 may be provided with a number of first grooves and / or a number of first protrusions to improve the connection strength between each first insulating coating 150 and the first region 1131.

[0060] For ease of description, the following explanation will take one of the surfaces of the current collection body 111 along the thickness direction Z as an example.

[0061] In some embodiments, the first region 1131 extends along the width direction Y of the tab 113 to the edge of at least one side of the tab 113, thereby increasing the area of ​​the first region 1131 to increase the connection length between the first region 1131 and the edge of the current collector 111, which in turn increases the connection area between the first insulating coating 150 and the active layer 130. This helps the first insulating coating 150 to support a larger area of ​​the active layer 130, further improving problems such as powder shedding and decarburization of the active layer 130.

[0062] As an example, the first region 1131 may extend to the two opposite edges of the tab 113 in the width direction Y.

[0063] In some embodiments, the thickness of the first insulating coating 150 is ≥20 micrometers and ≤35 micrometers, thereby ensuring that the first insulating coating 150 has sufficient thickness to improve the mechanical strength of the tab 113, and also reducing the impact of the first insulating coating 150 on the overall thickness of the electrode 100, thus reducing the impact on the energy density of the electrochemical device.

[0064] As an example, the thickness of the first insulating coating 150 can be 20 micrometers, 22 micrometers, 28 micrometers, 30 micrometers, 35 micrometers, or any other value between any two of the above.

[0065] In some embodiments, the length of the first insulating coating 150 is ≥0.5 mm and ≤1.9 mm along the direction from the current collector body 111 to the tab 113 (i.e., the length direction X). This ensures that the first insulating coating 150 has a sufficiently large coating area in the first region 1131, which helps the first insulating coating 150 to more stably support the active layer 130 and also avoids the situation where the length of the first insulating coating 150 is too long and affects the connection between the tab 113 and other structures.

[0066] As an example, the length of the first insulating coating 150 can be 0.5 mm, 0.75 mm, 1 mm, 1.5 mm, 1.9 mm, or any other value between any two of the above.

[0067] Please see Figure 1 and Figure 3 In some embodiments, the surface of the current collection body 111 along the thickness direction Z includes a central region 1111 and an edge region 1113 (e.g., ...). Figure 3 (As shown).

[0068] In each surface of the current collector 111 along the thickness direction Z, the edge region 1113 can be arranged in a ring around the middle region 1111, and the active layer 130 is coated on the middle region 1111.

[0069] The first region 1131 can be connected to the edge region 1113. The electrode 100 can also include a second insulating coating 170. The second insulating coating 170 can be coated on the edge region 1113 and connected to the first insulating coating 150 and the active layer 130 respectively. Thus, the second insulating coating 170 can be die-cut during the die-cutting process of the electrode 100 to avoid the active layer 130. This helps to reduce the powder shedding around the active layer 130 during the die-cutting process of the electrode 100, and further improves the safety of the electrochemical device.

[0070] It should be noted that in this embodiment, the first insulating coating 150 can be indirectly connected to the active layer 130 through the second insulating coating 170. The first insulating coating 150 can also support the active layer 130 to improve the problem of powder falling off the edges of the active layer 130.

[0071] In some embodiments, the edge region 1113 may be provided with a plurality of second grooves and / or a plurality of second protrusions. Thus, when the second insulating coating 170 is applied to the edge region 1113, the second insulating coating 170 may be connected to the inner wall of each second groove and / or the outer surface of each second protrusion, thereby increasing the contact area between the second insulating coating 170 and the second region 1133. Furthermore, the inner wall of the second groove and / or the outer surface of each second protrusion may restrict the displacement of the second insulating coating 170 under force, thereby improving the connection strength of the second insulating coating 170 in the second region 1133 and reducing the possibility of the second insulating coating 170 falling off.

[0072] The shape, arrangement, and manufacturing method of the second groove and the second protrusion can all refer to the first groove and the first protrusion described above, and will not be repeated here.

[0073] The material selection for the second insulating coating 170 can also refer to that for the first insulating coating 150, and will not be repeated here. It should be noted that the first insulating coating 150 and the second insulating coating 170 can be the same or different.

[0074] Please see Figure 4 In some embodiments, the electrode 100 may also include a conductive element 190.

[0075] The surface of the tab 113 may further include a second region 1133. When one surface of the tab 113 along the thickness direction Z is coated with the first insulating coating 150, that surface may include the first region 1131 and the second region 1133. When both surfaces of the tab 113 along the thickness direction Z are coated with the first insulating coating 150, each surface may include the first region 1131 and the second region 1133.

[0076] For ease of description, the following explanation will take the case where one of the surfaces of the tab 113 along the thickness direction Z is coated with the first insulating coating 150 as an example.

[0077] The second region 1133 can be connected to the side of the first region 1131 away from the current collector 111. The conductive element 190 is connected to the second region 1133. The conductive element 190 can be used to connect to an external circuit, that is, the tab 113 can be connected to an external circuit through the conductive element 190.

[0078] A receiving groove is formed between the conductive element 190 and the active layer 130. The first insulating coating 150 is disposed in the receiving groove, thereby determining the coating position of the first insulating coating 150, reducing the coating difficulty of the first insulating coating 150. The conductive element 190 can support the first insulating coating 150, which helps to improve the situation of the first insulating coating 150 falling off. The first insulating coating 150 can also better support the active layer 130, thereby improving the situation of powder falling off the active layer 130.

[0079] It should be noted that when both surfaces of the tab 113 along the thickness direction Z are coated with the first insulating coating 150, each second region 1133 can be connected to a conductive element 190. Both conductive elements 190 can extend and connect to each other in the direction away from the first region 1131 in the second region 1133. The connection method can be bonding or welding.

[0080] Please see Figures 4 to 5 In some embodiments, the conductive element 190 may include a first segment 191 and a second segment 193 connected to each other (e.g., ...). Figure 5 (As shown).

[0081] The second segment 193 can be stacked and connected to the second region 1133 to conduct the conductive element 190 and the tab 113. The connection method can be bonding or welding.

[0082] The first segment 191 can be stacked on the side of the second segment 193 opposite to the second region 1133 and extend away from the first region 1131, thereby increasing the depth of the first groove. This helps the first groove to accommodate a thicker first insulating coating 150 to more stably support the active layer 130. In addition, by placing the second segment 193 between the first segment 191 and the second region 1133, the first segment 191 and the second region 1133 can shield the burrs at the end of the second segment 193, reducing the impact of burrs on other structures within the electrochemical device.

[0083] It should be noted that the conductive element 190 may also include a third segment, a fourth segment, a fifth segment, etc. The third segment, the fourth segment, and the fifth segment can be connected in sequence, and the third segment is connected between the second segment 193 and the fourth segment. The third segment, the fourth segment, and the fifth segment can all be stacked between the second segment 193 and the second region 1133, or they can be stacked between the first segment 191 and the second segment 193, which helps to increase the depth of the first groove to accommodate a thicker first insulating coating 150.

[0084] In the electrode 100, electrochemical device, and electronic device provided in this application embodiment, a first region 1131 is provided on at least one surface of the tab 113 along the thickness direction Z. The first region 1131 is connected to the edge of the current collector 111. A first insulating coating 150 is coated on the first region 1131 and connected to the active layer 130. Thus, the first insulating coating 150 can increase the thickness and structural strength of the tab 113 in the first region 1131, and the first insulating coating 150 can support the edge of the active layer 130. This can improve the problem of powder shedding at the opposite edges of the active layer 130 and the tab 113. When the electrode 100 is applied to the electrochemical device, the number of free powder particles in the electrochemical device can be reduced, the short circuit of the electrochemical device during cycling can be reduced, and thermal runaway and other problems can be reduced, thereby improving the safety performance of the electrochemical device.

[0085] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. An electrode sheet, characterized in that, include: A current collector includes a current collector body and an electrode tab, the electrode tab extending outward from the edge of the current collector body; at least one surface of the electrode tab along the thickness direction includes a first region, the first region being connected to the edge of the current collector body. An active layer is coated on at least one surface of the current collector body along the thickness direction; A first insulating coating is applied to the first region and attached to the active layer.

2. The electrode sheet according to claim 1, characterized in that, The first region is provided with a plurality of first grooves and / or a plurality of first protrusions.

3. The electrode sheet according to claim 1, characterized in that, The current collector body is coated with the active layer on both opposite surfaces along the thickness direction; the electrode tab includes the first region on both opposite surfaces along the thickness direction, and each first region is coated with the first insulating coating. And / or, the first region extends along the width direction of the electrode to at least one edge of the electrode.

4. The electrode sheet according to claim 1, characterized in that, The surface of the current collection body includes a middle region and an edge region. The edge region is arranged in a ring around the middle region, and the first region is connected to the edge region. The active layer is coated on the intermediate region; The electrode further includes a second insulating coating, which is applied to the edge region and connected to the first insulating coating and the active layer, respectively.

5. The electrode sheet according to claim 1, characterized in that, The electrode also includes a conductive element; The surface of the electrode tab further includes a second region, which is connected to the side of the first region away from the current collector body, and the conductive element is connected to the second region; A receiving groove is formed between the conductive element and the active layer, and the first insulating coating is disposed in the receiving groove.

6. The electrode sheet according to claim 5, characterized in that, The conductive element includes a first segment and a second segment connected to each other, the second segment being stacked and connected to the second region; the first segment is stacked on the side of the second segment opposite to the second region and extends toward the side away from the first region.

7. The electrode sheet according to any one of claims 1 to 6, characterized in that, The first insulating coating is a ceramic coating; Alternatively, the first insulating coating may include a ceramic coating and an adhesive layer, the adhesive layer being bonded between the first region and the ceramic coating, and the adhesive layer and / or the ceramic coating being connected to the active layer.

8. The electrode sheet according to any one of claims 1 to 6, characterized in that, The thickness of the first insulating coating is ≥20 micrometers and ≤35 micrometers; And / or, along the direction from the current collector body to the tab, the length of the first insulating coating is ≥0.5 mm and ≤1.9 mm.

9. An electrochemical device, characterized in that, Including the electrode sheet according to any one of claims 1 to 8.

10. An electronic device, characterized in that, Includes the electrochemical device according to claim 9.

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