Electrochemical device and electric equipment

Abstract

The utility model discloses an electrochemical device and electrical equipment. The utility model discloses an electrochemical device includes electrode subassembly and support part, and electrode subassembly includes cathode sheet, anode sheet and diaphragm. The cathode sheet includes first current collector and first active material layer. The first active material layer of one side is connected with support structure area, and the first active material layer of other side includes recess structure area, and support structure area includes support part, and recess structure area sets up recess part. The support part of one side at the corner of cathode sheet can be supported between two adjacent pole sheets and form clearance, improve the problem that foil breaks due to stress extrusion. And the recess part on the first active material layer of other side of cathode sheet can provide greater space for the circulation of electrolyte, avoid extrusion and make electrolyte be extruded from clearance to cause the phenomenon of corner lithium precipitation, therefore, the design can effectively improve the problem of corner lithium precipitation and foil breakage.

Description

Technical Field

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

[0002] In the field of lithium batteries, lithium plating in electrode components has become a key issue restricting battery life and safety. Due to structural characteristics and electrode expansion during cycling, problems such as corner lithium plating and foil breakage exist in the corner areas of electrode components. The electrode component structures in related technologies cannot effectively solve both problems. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an electrochemical device that can improve the problems of lithium plating at the corners of electrode components and foil breakage.

[0004] This application also proposes an electrical device having the above-mentioned electrochemical apparatus.

[0005] An electrochemical device according to a first aspect of this application includes an electrode assembly and a support portion. The electrode assembly includes a cathode plate, an anode plate, and a diaphragm. The cathode plate includes a plurality of first straight segments and a plurality of first corner segments sequentially connected along the winding direction of the electrode assembly. The cathode plate includes a first current collector and a first active material layer. The first current collector includes a first surface facing the interior of the electrode assembly and a second surface facing the exterior of the electrode assembly. At least one of the first corner segments has the first active material layer on both its first and second surfaces. One side of the first active material layer is connected to a support structure region, and the other side of the first active material layer includes a groove structure region. The support structure region includes the support portion, and the groove structure region has a groove portion. The anode plate includes a plurality of second straight segments and a plurality of second corner segments sequentially connected along the winding direction of the electrode assembly. The cathode plate and the anode plate are stacked and wound around each other. The diaphragm is disposed between the cathode plate and the anode plate.

[0006] The electrochemical device according to the embodiments of this application has at least the following beneficial effects: A support portion is provided on one side of the cathode plate corner to support the gap formed between adjacent electrodes, thereby reducing the compression caused by electrode expansion and stress concentration, improving the problem of foil breakage due to stress compression, and the gap also provides a channel for electrolyte flow, thus improving lithium plating. Furthermore, a groove is formed on the first active material layer on the other side of the cathode plate to provide more space for electrolyte flow, preventing compression that could cause the electrolyte to be squeezed out of the gap and thus prevent corner lithium plating. Therefore, this design can effectively improve the corner lithium plating phenomenon and the problem of foil breakage.

[0007] According to some embodiments of this application, the support structure region is connected to the first active material layer on the first surface, and the groove structure region is disposed on the first active material layer on the second surface.

[0008] According to some embodiments of this application, a plurality of support portions are spaced apart in the support structure area, and / or a plurality of groove portions are spaced apart in the groove structure area.

[0009] According to some embodiments of this application, along the length direction of the cathode sheet, the distance between two adjacent support portions is C1, the distance between two adjacent groove portions is C2, 0.2μm≤C1≤1.5μm, and / or, 0.5μm≤C2≤3μm.

[0010] According to some embodiments of this application, the number of the first corner segments is N, the number of the supporting structure areas is N1, the number of the groove structure areas is N2, 0.3N≤N1≤N, and / or, 0.3N≤N2≤N.

[0011] According to some embodiments of this application, the thickness of the support portion is H1, the depth of the groove is H2, 3μm≤H1≤15μm, and / or, 10μm≤H2≤150μm.

[0012] According to some embodiments of this application, the shape of the support portion is one of a cone, a frustum, a rectangle, or a sphere, and / or the shape of the groove portion is one of a strip groove extending along the width direction of the cathode sheet or a dotted groove distributed at intervals.

[0013] According to some embodiments of this application, the material of the support portion is one of aluminum oxide, silicon nitride, silicon carbide, boron nitride, polyethylene, polypropylene, polyvinylidene fluoride, polytetrafluoroethylene, polyethylene terephthalate, and nonwoven fabric.

[0014] According to some embodiments of this application, along the length direction of the cathode sheet, the size of the support structure area is L1, the size of the groove structure area is L2, the size of the first corner segment is L3, 0 < (L1 - L3) ≤ 3 mm, and / or, 0 < (L2 - L3) ≤ 3 mm.

[0015] The electrical equipment according to the second aspect of this application includes the electrochemical device described in any one of the first aspect embodiments.

[0016] The electrical device according to the embodiments of this application has at least the following beneficial effects: A support portion is provided on one side of the cathode plate corner to support the gap between adjacent electrodes, thereby reducing the compression caused by electrode expansion and stress concentration, improving the problem of foil breakage due to stress compression, and the gap also provides a channel for electrolyte flow, thus improving lithium plating. Furthermore, a groove is formed on the first active material layer on the other side of the cathode plate to provide more space for electrolyte flow, preventing compression that could cause the electrolyte to be squeezed out of the gap and thus cause corner lithium plating. Therefore, this design can effectively improve the corner lithium plating phenomenon and foil breakage problem in electrochemical devices, and the electrical device using this electrochemical device can also improve its service life and power quality.

[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 present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the electrochemical device in one embodiment of this application; Figure 2 This is a side view of the cathode plate of an electrochemical device in one embodiment of this application; Figure 3 This is a schematic diagram of the first and second surfaces of the cathode sheet in one embodiment of this application.

[0019] Reference numerals: electrochemical device 100, support 101, cathode plate 102, anode plate 103, diaphragm 104, first current collector 105, first active material layer 106, first straight section 107, first corner section 108, second straight section 109, second corner section 110, groove 111, first surface 201, second surface 202, support structure area 203, groove structure area 204. Detailed Implementation

[0020] The embodiments of this application 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 application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] In the description of this application, "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.

[0023] In the description of this application, unless otherwise expressly defined, terms such as "setup," "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 application in conjunction with the specific content of the technical solution.

[0024] In the description of this application, 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 application. 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.

[0025] Due to structural characteristics and electrode expansion during recycling, problems such as corner lithium plating and foil breakage exist in the corner areas of the electrode assembly. The electrode assembly structure in related technologies cannot effectively solve both problems.

[0026] This application proposes an electrochemical device 100 that can simultaneously improve the phenomenon of lithium plating at the corners of the electrode assembly and the phenomenon of foil breakage.

[0027] refer to Figure 1 and Figure 2An electrochemical device 100 according to a first aspect embodiment of this application includes an electrode assembly and a support portion 101. The electrode assembly includes a cathode plate 102, an anode plate 103, and a diaphragm 104. The cathode plate 102 includes a plurality of first straight segments 107 and a plurality of first corner segments 108 sequentially connected along the winding direction of the electrode assembly. The cathode plate 102 includes a first current collector 105 and a first active material layer 106. The first current collector 105 includes a first surface 201 facing the interior of the electrode assembly and a second surface 202 facing the exterior of the electrode assembly. At least one first corner segment 108 has a first active material layer 106 on both its first surface 201 and second surface 202. One side of the first active material layer 106 is connected to a support structure region 203, and the other side of the first active material layer 106 includes a groove structure region 204. The support structure region 203 includes a support portion 101, and the groove structure region 204 has a groove portion 111. The anode plate 103 includes multiple second straight sections 109 and multiple second corner sections 110 connected sequentially along the winding direction of the electrode assembly. The cathode plate 102 and the anode plate 103 are stacked and wound together, and a diaphragm 104 is disposed between the cathode plate 102 and the anode plate 103. A support portion 101 is provided on one side of the corner of the cathode plate 102 to support the gap between adjacent electrodes, thereby reducing the compression caused by electrode expansion and stress concentration, improving the problem of foil breakage due to stress compression, and the gap can also provide a channel for electrolyte flow, thereby improving lithium plating. On the other side of the cathode plate 102, a groove portion 111 is formed on the first active material layer 106 to provide more space for electrolyte flow, avoiding compression that causes the electrolyte to be squeezed out of the gap, thus preventing corner lithium plating. Therefore, this design can effectively improve the corner lithium plating phenomenon and the problem of foil breakage.

[0028] It should be noted that the reference Figure 1 In some embodiments of this application, the anode sheet 103 includes a second current collector and a second active material layer. The second active material layer and the first active material layer 106 jointly participate in the charge and discharge reaction to realize the extraction and insertion of lithium ions. The second current collector serves to support the second active material layer and conduct current.

[0029] It should be noted that the electrochemical device 100 includes any device in which an electrochemical reaction occurs to convert chemical energy into electrical energy and vice versa. Specific, non-limiting examples include all types of primary batteries, secondary batteries, fuel cells, solar cells, or capacitors. In particular, the electrochemical device 100 is a lithium secondary battery, including lithium metal secondary batteries, lithium-ion secondary batteries, lithium polymer secondary batteries, or lithium-ion polymer secondary batteries.

[0030] refer to Figure 1 and Figure 2In some embodiments of this application, the support structure region 203 is connected to the first active material layer 106 of the first surface 201, and the groove structure region 204 is disposed on the first active material layer 106 of the second surface 202. This design is mainly to allow the groove structure region 204 to face the outside of the electrode assembly. After the cathode sheet 102 is wound, the sidewall of the groove portion 111 will open under tension, thereby increasing the area of ​​the groove portion 111, increasing the channel of the electrolyte, and further improving the corner lithium plating phenomenon.

[0031] refer to Figure 2 and Figure 3 In some embodiments of this application, a plurality of support portions 101 are spaced apart within the support structure region 203, and / or a plurality of groove portions 111 are spaced apart within the groove structure region 204. The plurality of support portions 101 can improve the support effect between adjacent electrodes and can distribute the stress generated by compression, preventing individual support portions 101 from being subjected to excessive stress and deforming, and making the stress on the electrodes more uniform, reducing the phenomenon of foil breakage. The plurality of groove portions 111 are designed to further improve the electrolyte flow capacity and prevent excessive electrolyte from being squeezed out at corners due to compression, leading to lithium plating. Further, refer to... Figure 3 In some embodiments of this application, the multiple support portions 101 may be spaced out in multiple rows along the length of the cathode sheet 102, or in multiple rows along the width of the cathode sheet 102, or a combination of both arrangements. Similarly, the multiple groove portions 111 may be spaced out in multiple rows along the length of the cathode sheet 102, or in multiple rows along the width of the cathode sheet 102, or a combination of both arrangements, as long as flexible electrolyte flow, wetting, and storage capabilities can be achieved.

[0032] refer to Figure 2In some embodiments of this application, along the length direction of the cathode sheet 102, the distance between two adjacent support portions 101 is C1, and the distance between two adjacent groove portions 111 is C2, where 0.2μm≤C1≤1.5μm, and / or 0.5μm≤C2≤3μm. Specifically, C1 can be 0.2μm, 0.3μm, 0.4μm, 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, 1μm, 1.1μm, 1.2μm, 1.3μm, 1.4μm, 1.5μm, or within the range of any two of the above values. A suitable spacing between the support portions 101 can serve the dual purpose of supporting the electrode and providing a gap for the flow of electrolyte. When C1 is less than 0.2 μm, the distance between two adjacent support portions 101 is too small, and the arrangement of the support portions 101 is too tight, which may lead to local stress concentration and cause the foil to break. In addition, the overly tight arrangement is not conducive to the flow of electrolyte and is not conducive to improving the lithium plating phenomenon. When C1 is greater than 1.5 μm, the distance between two adjacent support portions 101 is too large, which will reduce the support capacity. The area between adjacent support portions 101 lacks effective constraint, making the improvement effect not obvious. Specifically, C2 can be 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, 1μm, 1.1μm, 1.2μm, 1.3μm, 1.4μm, 1.5μm, 1.7μm, 1.9μm, 2μm, 2.2μm, 2.4μm, 2.6μm, 2.8μm, 3μm, or within the range of any two of the above values. A suitable spacing between the grooves 111 can effectively achieve the dual purpose of improving corner lithium plating while maintaining a certain structural strength. When C2 is less than 0.5μm, the spacing between two adjacent grooves 111 is too small. Overly dense grooves may result in weak mechanical support of the cathode sheet 102 in this area. Furthermore, if the active material layer between two grooves 111 is too thin, it may peel off during volume changes, potentially causing powder shedding or breakage of the first current collector 105. When C2 is greater than 3μm, the gap between two adjacent grooves 111 is too large, making the grooves 111 sparse overall. The improvement in electrolyte wetting and flow capacity at the corner is not significant, resulting in insufficient improvement in the corner lithium plating phenomenon.

[0033] In some embodiments of this application, the number of first corner segments 108 is N, the number of support structure regions 203 is N1, and the number of groove structure regions 204 is N2, where 0.3N≤N1≤N, and / or 0.3N≤N2≤N. Providing multiple support structure regions 203 and groove structure regions 204 allows for a more uniform overall structural arrangement of the electrode assembly. Support structure regions 203 are provided on multiple first corner segments 108 to support and improve stress, and groove structure regions 204 are provided to provide electrolyte flow and wetting. Specifically, N, N1, and N2 are all integers, and as shown... Figure 1 As shown, a support structure area 203 and a groove structure area 204 can be arranged on a first corner segment 108. When there are a total of 28 first corner segments 108, 20 of them can be provided with either a support structure area 203 or a groove structure area 204, so the number of support structure areas 203 and groove structure areas 204 is 20. N1 can be 0.3N, 0.5N, N, or any two of the above values. N2 can also be 0.3N, 0.5N, N, or any two of the above values. However, the values ​​of N1 and N2 are both integers. When N1 and N2 are less than 0.3N, the number of support structure areas 203 and groove structure areas 204 is too small, which is not significant enough to improve foil breakage and corner lithium plating.

[0034] refer to Figure 2In some embodiments of this application, the thickness of the support portion 101 is H1, the depth of the groove is H2, 3μm≤H1≤15μm, and / or 10μm≤H1≤150μm. Specifically, the thickness of the support portion 101 can be 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, or within any two of the above values. When H1 is less than 3μm, the thickness of the support portion 101 is too small, and the electrodes may still be over-fitted, stress concentration is not relieved, the electrolyte is squeezed, lithium-ion transport is not smooth, and the improvement effect on corner lithium plating and foil breakage is not obvious. When H1 is greater than 15μm, the thickness of the support portion 101 is too large, and the gap between the electrodes is too large, which may lead to poor overall structural stability. In addition, the electrodes will expand and contract during the charging and discharging process, which will further damage the mechanical support mechanism. Furthermore, the excessive gap will also produce ineffective gaps, resulting in a decrease in overall energy density. Specifically, the depth of the groove portion 111 can be 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, or any two of the above values. When H2 is less than 10 μm, the groove 111 is too shallow, and the electrolyte flow channel formed by the groove 111 is not effective. When squeezed, the groove 111 may not be able to allow the electrolyte to flow well inside, resulting in an insignificant improvement effect on lithium plating at the corner. When H2 is greater than 150 μm, the groove 111 is too deep. On the one hand, it will thin the first active material layer 106 too much, directly leading to a reduction in the content of the first active material layer 106 and a decrease in energy density. On the other hand, excessive thinning will also reduce the mechanical support capacity at this location, resulting in the first active material layer 106 falling off locally or the first current collector 105 breaking due to volume changes during charging and discharging in this area.

[0035] refer to Figure 3 In some embodiments of this application, the support portion 101 is shaped as a cone, frustum, rectangle, or sphere, and / or the groove portion 111 is shaped as a strip groove extending along the width direction of the cathode sheet 102 or a dotted groove spaced apart. Both the support portion 101 and the groove portion 111 can be configured in various shapes to meet different needs, and can have various mold shapes during processing. Therefore, the manufacturing method of the support portion 101 or the groove portion 111 can be selected according to the shape of the pressing mold, or the finished support portion 101 can be directly connected to the cathode sheet 102. Thus, the multiple shape designs of the support portion 101 and the groove portion 111 provide better processing adaptability.

[0036] In some embodiments of this application, the support portion 101 is made of one of the following materials: aluminum oxide, silicon nitride, silicon carbide, boron nitride, polyethylene, polypropylene, polyvinylidene fluoride, polytetrafluoroethylene, polyethylene terephthalate, and nonwoven fabric. Choosing ceramic materials such as aluminum oxide, silicon nitride, silicon carbide, and boron nitride allows the support portion 101 to have high strength and rigidity. Furthermore, ceramic materials have high chemical stability, do not react with electrolytes, and are therefore relatively corrosion-resistant. They also possess good thermal stability and insulation properties. Conversely, choosing polymers such as polyethylene, polypropylene, polyvinylidene fluoride, polytetrafluoroethylene, polyethylene terephthalate, and nonwoven fabric allows the support portion 101 to have high flexibility and elasticity, enabling stress buffering. It also has good insulation, stable chemical properties, and does not easily react with electrolytes. The high flexibility of polymers can disperse stress and reduce the risk of foil breakage. The above materials can be selected for the preparation of the support portion 101 according to requirements.

[0037] refer to Figure 2 In some embodiments of this application, along the length of the cathode sheet 102, the size of the support structure region 203 is L1, the size of the groove structure region 204 is L2, and the size of the first corner segment 108 is L3, where 0 < (L1 - L3) ≤ 3 mm, and / or 0 < (L2 - L3) ≤ 3 mm. The size of the support structure region 203 refers to the maximum distance between the two endpoints of the two furthest supports 101 within a first corner segment 108, including the gap between adjacent supports 101. The fact that the sizes of both the support structure region 203 and the groove structure region 204 are larger than the size of the first corner segment 108 ensures that the entire first corner segment 108 has supports 101 and grooves 111, thereby improving lithium plating and foil breakage in the corner area. Specifically, (L1 - L3) or (L2 - L3) can be within the range of 2 mm, 2.5 mm, 3 mm, or 0~3 mm. When (L1—L3) or (L2—L3) is greater than 3mm, the support structure area 203 and the groove structure area 204 exceed the size of the first corner section 108 by too much. On the one hand, this will cause unnecessary processing and material loss. Since the main problem to be solved is the lithium plating and foil breakage at the corner, setting too many support parts 101 or opening groove parts 111 on the first straight section 107 will reduce the energy density of the electrode assembly.

[0038] The electrical device according to the second aspect of this application includes the electrochemical device 100 of any one of the first aspect embodiments. A support portion 101 is provided on one side of the corner of the cathode plate 102 to support the gap between adjacent electrodes, thereby reducing the compression caused by electrode expansion and stress concentration, improving the problem of foil breakage due to stress compression, and the gap also provides a channel for electrolyte flow, thus improving lithium plating. A groove portion 111 is formed on the first active material layer 106 on the other side of the cathode plate 102 to provide more space for electrolyte flow, preventing compression that could cause the electrolyte to be squeezed out of the gap and thus causing corner lithium plating. Therefore, this design can effectively improve the corner lithium plating phenomenon and foil breakage problem in the electrochemical device 100, and the electrical device using the electrochemical device 100 can also improve its service life and power quality.

[0039] It should be noted that the electrical equipment used in this application is not particularly limited, and can be any electrical equipment known in the prior art. The electrochemical device 100 of this application is not particularly limited in its use, and can be used with any electrical equipment known in the prior art. According to some embodiments of this application, the electrical equipment includes, but is 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, robot dogs, industrial robots, and android robots.

[0040] The following are specific embodiments of this application:

[0041] In the phrase "200cls", "cls" is an abbreviation for cycles (number of charge-discharge cycles). "200cls lithium plating" means that after 200 cycles, lithium plating occurs after the electrochemical device 100 completes 200 full charge-discharge cycles. The same applies to foil cracking. As can be seen from the above embodiments, the addition of the support part 101 and the groove part 111 significantly improves the lithium plating phenomenon and the foil breakage phenomenon.

[0042] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application 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 this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. An electrochemical device, characterized in that, The assembly includes an electrode assembly and a support, wherein the electrode assembly includes a cathode plate, an anode plate, and a diaphragm. The cathode sheet includes a plurality of first straight sections and a plurality of first corner sections connected sequentially along the winding direction of the electrode assembly. The cathode sheet includes a first current collector and a first active material layer. The first current collector includes a first surface facing the interior of the electrode assembly and a second surface facing the exterior of the electrode assembly. At least one of the first corner segments has a first surface and a second surface provided with the first active material layer, wherein the first active material layer on one side is connected to a support structure area, and the first active material layer on the other side includes a groove structure area, wherein the support structure area includes the support portion, and the groove structure area has a groove portion. The anode sheet includes a plurality of second straight segments and a plurality of second corner segments connected sequentially along the winding direction of the electrode assembly; the cathode sheet and the anode sheet are stacked and wound together. The diaphragm is disposed between the cathode plate and the anode plate.

2. The electrochemical device according to claim 1, characterized in that, The support structure region is connected to the first active material layer on the first surface, and the groove structure region is disposed on the first active material layer on the second surface.

3. The electrochemical device according to claim 1, characterized in that, The support structure area has a plurality of support portions distributed at intervals, and / or the groove structure area has a plurality of groove portions distributed at intervals.

4. The electrochemical device according to claim 3, characterized in that, Along the length of the cathode sheet, the distance between two adjacent support portions is C1, and the distance between two adjacent groove portions is C2, with 0.2μm≤C1≤1.5μm, and / or 0.5μm≤C2≤3μm.

5. The electrochemical device according to claim 1, characterized in that, The number of the first corner segments is N, the number of the supporting structure areas is N1, the number of the groove structure areas is N2, 0.3N≤N1≤N, and / or, 0.3N≤N2≤N.

6. The electrochemical device according to claim 1, characterized in that, The thickness of the support is H1, and the depth of the groove is H2, where 3μm≤H1≤15μm, and / or 10μm≤H2≤150μm.

7. The electrochemical device according to claim 1, characterized in that, The support portion is shaped as one of a cone, frustum, rectangle, or sphere, and / or the groove portion is shaped as one of a strip groove extending along the width direction of the cathode sheet or a dotted groove spaced apart.

8. The electrochemical device according to claim 1, characterized in that, The support is made of one of the following materials: aluminum oxide, silicon nitride, silicon carbide, boron nitride, polyethylene, polypropylene, polyvinylidene fluoride, polytetrafluoroethylene, polyethylene terephthalate, or nonwoven fabric.

9. The electrochemical device according to claim 1, characterized in that, Along the length of the cathode sheet, the size of the support structure area is L1, the size of the groove structure area is L2, the size of the first corner segment is L3, 0 < (L1 - L3) ≤ 3 mm, and / or 0 < (L2 - L3) ≤ 3 mm.

10. Electrical equipment, characterized in that, The electrochemical device includes any one of claims 1 to 9.

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