Electrode sheet, cell, battery, battery assembly, and electric device

Abstract

An electric device comprises a battery assembly or a battery; the battery assembly comprises the battery or a cell; the battery comprises the cell; and the cell comprises an electrode sheet. The electrode sheet comprises a conductive layer and a coating layer, the coating layer being arranged on the surface of the conductive layer. In a first direction, the coating layer has two opposite side edges. At least one groove is formed on the coating layer, and at least a part of the groove bends and extends in a second direction, away from one of the two side edges of the coating layer in the first direction, the first direction intersecting the second direction.

Description

Electrode sheets, electrode cores, batteries, battery packs, and electrical equipment

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese patent application No. 202421617842.7, filed on July 9, 2024, with the China National Intellectual Property Administration and entitled “Electrode, Electrode Core, Battery, Battery Module and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, and in particular to an electrode, electrode core, battery, battery assembly and electrical device. Background Technology

[0004] In related technologies, electrodes mainly consist of metal or composite current collectors, and negative or positive electrode materials coated on one or both sides of the current collector, and are manufactured through processes such as flat roller pressing and cutting. Electrodes made by flat roller pressing have better flatness. However, due to the high particle density on the surface of the electrode after rolling, the electrolyte wetting speed of the electrode is slow during subsequent battery manufacturing.

[0005] Public content

[0006] This disclosure aims to at least solve one of the technical problems existing in the prior art. To this end, one object of this disclosure is to provide an electrode that improves the electrolyte wetting speed and also improves the electrode's flexibility, making it easy to bend.

[0007] The second objective of this disclosure is to propose an electrode core employing the aforementioned electrode sheet.

[0008] The third objective of this disclosure is to propose a battery employing the aforementioned electrode core.

[0009] The fourth objective of this disclosure is to provide a battery assembly employing the aforementioned electrode core or the aforementioned battery.

[0010] The fifth object of this disclosure is to provide an electrical device that uses the above-described battery or battery assembly.

[0011] An electrode sheet according to a first aspect of the present disclosure includes a conductive layer and a dressing layer disposed on the surface of the conductive layer. The dressing layer has two opposing sides along a first direction, and at least one groove is formed on the dressing layer. At least a portion of the groove bends and extends along a second direction toward one of the two sides along the first direction away from the dressing layer, wherein the first direction and the second direction intersect.

[0012] According to the electrode of this disclosure, the electrolyte can penetrate into the conductive layer along the depth direction of the groove, shortening the electrolyte's travel distance and increasing the wetting speed of the electrode. Furthermore, when the electrode is wound to form the electrode core, the electrolyte can flow along the extension direction of the groove or penetrate into the coating layer from the sidewall of the groove, thereby facilitating the electrolyte's penetration from the outside of the electrode core into the coating layer of the electrode, shortening the travel distance of the electrolyte from the outside of the electrode core into the coating layer of the electrode. In addition, the groove design, when the electrode is wound to form the electrode core, improves the flexibility of the electrode, as well as its deformation and adaptability, thereby reducing the impact of bending on the electrode and lowering the manufacturing difficulty of the electrode core.

[0013] According to some embodiments of this disclosure, when the electrode is wound into a cylindrical shape along the first direction, the groove is a spiral groove that extends and bends along the circumference of the cylinder.

[0014] According to some embodiments of this disclosure, the groove extends through both sides of the dressing layer along the second direction; or, the groove extends through adjacent sides of the dressing layer.

[0015] According to some embodiments of this disclosure, the width of the groove is w, wherein w satisfies: 0.5μm≤w≤100μm.

[0016] According to some embodiments of this disclosure, w further satisfies: 20μm≤w≤50μm.

[0017] According to some embodiments of this disclosure, the depth of the groove is h1, and the thickness of the dressing layer is h2, wherein h1 and h2 satisfy: 0 < h1 / h2 ≤ 0.9.

[0018] According to some embodiments of this disclosure, h1 and h2 further satisfy: 0.3≤h1 / h2≤0.7.

[0019] According to some embodiments of this disclosure, h2 satisfies: 20μm≤h2≤250μm.

[0020] According to some embodiments of this disclosure, the cross-sectional shape of the groove is polygonal or arc-shaped.

[0021] According to some embodiments of this disclosure, the thickness of the conductive layer is h3, wherein h3 satisfies: 9μm≤h3≤25μm.

[0022] According to some embodiments of this disclosure, along the second direction, the groove first bends and extends toward one of the two sides along the first direction away from the dressing layer, and then bends and extends toward one of the two sides along the first direction closer to the dressing layer.

[0023] According to some embodiments of this disclosure, the dressing layer is multi-layered, and the multi-layered dressing layers are respectively disposed on both sides of the conductive layer in the thickness direction.

[0024] According to some embodiments of this disclosure, there are multiple grooves, and the multiple grooves are arranged at intervals along the first direction.

[0025] According to some embodiments of this disclosure, the minimum distance between two adjacent grooves is d, wherein d satisfies: 0.1mm≤d≤20mm.

[0026] According to some embodiments of this disclosure, the d further satisfies: 5mm≤d≤10mm.

[0027] The electrode core according to a second aspect embodiment of the present disclosure includes the electrode sheet according to the first aspect embodiment of the present disclosure described above.

[0028] A battery according to a third aspect of this disclosure includes an electrode core according to the second aspect of this disclosure described above.

[0029] A battery assembly according to a fourth aspect of this disclosure includes an electrode core according to a second aspect of this disclosure, or a battery according to a third aspect of this disclosure.

[0030] An electrical appliance according to a fifth aspect of the present disclosure includes a battery according to a third aspect of the present disclosure, or a battery assembly according to a fourth aspect of the present disclosure.

[0031] Additional aspects and advantages of this disclosure 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 disclosure. Attached Figure Description

[0032] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0033] Figure 1 is a side view of an electrode sheet according to an embodiment of the present disclosure;

[0034] Figure 2 is a top view of an electrode sheet according to an embodiment of the present disclosure, wherein an electrode tab is connected to the electrode sheet;

[0035] Figure 3 is a top view of an electrode sheet according to another embodiment of the present disclosure, wherein an electrode tab is connected to the electrode sheet;

[0036] Figure 4 is a top view of an electrode sheet according to another embodiment of the present disclosure, wherein a plurality of grooves are densely arranged;

[0037] Figure 5 is a schematic diagram of the electrode core according to an embodiment of the present disclosure;

[0038] Figure 6 is a schematic block diagram of a battery according to an embodiment of the present disclosure;

[0039] Figure 7 is a schematic block diagram of a battery assembly according to an embodiment of the present disclosure;

[0040] Figure 8 is another schematic block diagram of a battery assembly according to an embodiment of the present disclosure;

[0041] Figure 9 is a schematic block diagram of an electrical appliance according to an embodiment of the present disclosure;

[0042] Figure 10 is another schematic block diagram of an electrical appliance according to an embodiment of the present disclosure.

[0043] Reference numerals: 100, electrode sheet; 300, battery; 400, battery assembly; 500, electrical device; 1, conductive layer; 2, coating layer; 21, groove; 200, electrode core; 201, tab. Detailed Implementation

[0044] The embodiments of this disclosure are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The electrode 100 according to the first aspect embodiment of this disclosure is described below with reference to Figures 1-4. The electrode 100 can be used to fabricate the electrode core 200, but is not limited thereto. The electrode 100 described below in this application is used as an example for the electrode core 200 for detailed description.

[0045] As shown in FIG1, the electrode 100 according to the first aspect embodiment of the present disclosure includes a conductive layer 1 and a dressing layer 2.

[0046] Specifically, the dressing layer 2 is disposed on the surface of the conductive layer 1. Along the first direction (the left-right direction as shown in FIG2), the dressing layer 2 has two opposing sides. At least one groove 21 is formed on the dressing layer 2. At least a portion of the groove 21 extends in a second direction (the up-down direction as shown in FIG3 and FIG5) toward one of the two sides along the first direction away from the dressing layer 2. The first direction and the second direction can be intersecting, for example, the first direction and the second direction are perpendicular.

[0047] For example, in the examples of Figures 1-3, the groove 21 is recessed towards the conductive layer 1. The arrangement of the groove 21 can include several cases: First, from top to bottom, the middle and lower portions of the groove 21 bend and extend away from the right side of the dressing layer 2, and the middle portion of the groove 21 protrudes towards the lower right corner of the dressing layer 2 (as shown in Figures 3 and 4). Second, from top to bottom, the middle and lower portions of the groove 21 bend and extend away from the right side of the dressing layer 2, and the middle portion of the groove 21 protrudes towards the upper left corner of the dressing layer 2 (as shown in Figure 5), but is not limited to these cases.

[0048] With this configuration, when the electrolyte enters the conductive layer 1 from the dressing layer 2, it first enters the groove 21, then penetrates into the dressing layer 2 along the bottom and side walls of the groove 21 before entering the conductive layer 1. In other words, the electrolyte can penetrate into the conductive layer 1 along the depth direction of the groove 21, thereby shortening the movement distance of the electrolyte in the dressing layer 2 and increasing the wetting speed of the electrolyte. This, in turn, increases the wetting speed of the electrolyte from the outside of the electrode 100 into the inside of the electrode 100. Furthermore, when the electrode 100 is wound to form the electrode core 200, the electrolyte flowing onto the electrode core 200 can flow along the extension direction of the groove 21 and quickly penetrate into the dressing layer 2 along the side walls of the groove 21. In other words, the groove 21 not only facilitates the penetration of the electrolyte from the outside of the electrode core 200 into the dressing layer 2 of the electrode 100, but also shortens the movement distance of the electrolyte from the dressing layer 2 to the conductive layer 1. In addition, the electrode sheet 100 can be formed into the electrode core 200 by stacking or winding. When the electrode sheet 100 is formed into the electrode core 200 by winding, the electrode sheet 100 is bent and the bending extension of the groove 21 improves the flexibility of the electrode sheet 100, as well as its deformation and adaptability. This reduces the impact of bending on the electrode sheet 100, reduces the production difficulty of the electrode core 200, and improves the production efficiency of the electrode core 200.

[0049] According to the electrode 100 disclosed herein, the electrolyte can penetrate into the conductive layer 1 along the depth direction of the groove 21, shortening the movement distance of the electrolyte and increasing the wetting speed of the electrolyte on the electrode 100. Moreover, when the electrode 100 is wound to form the electrode core 200, the electrolyte can flow along the extension direction of the groove 21 or penetrate into the coating layer 2 from the side wall of the groove 21, thereby facilitating the penetration of the electrolyte from the outside of the electrode core 200 into the coating layer 2 of the electrode 100, shortening the movement distance of the electrolyte from the outside of the electrode core 200 into the coating layer 2 of the electrode 100; in addition, the setting of the groove 21, when the electrode 100 is wound to form the electrode core 200, improves the flexibility of the electrode 100, and also improves the deformation and adaptability of the electrode 100, thereby reducing the impact of bending on the electrode 100 and reducing the production difficulty of the electrode core 200.

[0050] According to some embodiments of this disclosure, referring to FIG5, when the electrode 100 is wound into a cylindrical shape along a first direction (i.e., the left-right direction), the groove 21 is a spiral groove extending along the circumferential surface of the cylinder. For example, when the electrode 100 is wound to form the electrode core 200, the groove 21 is spirally bent around the outer circumferential surface of the cylinder multiple times along the axial direction of the cylinder. With this configuration, when the electrode 100 is bent and wound into a cylinder, the spiral groove 21 facilitates the bending of the electrode 100, reduces the difficulty of winding the electrode 100 into a cylindrical shape, and thus improves the production efficiency of the electrode core 200. In addition, the spiral groove 21 can generate a certain deformation and adaptability, thereby reducing the impact of bending on the electrode 100 and improving the flexibility of the electrode 100, reducing the difficulty of winding the electrode 100. Furthermore, the electrolyte can also flow along the extension direction of the groove 21 so that the electrolyte comes into contact with and wets various parts of the dressing layer 2.

[0051] According to some embodiments of this disclosure, referring to FIG2, the groove 21 penetrates both sides of the dressing layer 2 along the second direction (i.e., the vertical direction). For example, in the example of FIG2, when the groove 21 extends in a curved vertical direction, the groove 21 penetrates both the upper and lower sides of the dressing layer 2. Therefore, when electrolyte is introduced, the electrolyte can flow in a downward direction on the dressing layer 2, allowing the electrolyte to contact and wet all parts of the dressing layer 2, improving the uniformity of electrolyte wetting on the electrode 100, and further contributing to improving the performance of the electrode 100. Furthermore, it also facilitates the formation of the groove 21, reducing the manufacturing difficulty of the electrode 100.

[0052] According to some embodiments of this disclosure, referring to FIG3, the groove 21 penetrates the adjacent two side surfaces of the dressing layer 2. For example, the groove 21 can be configured in several ways: First, the groove 21 penetrates the upper side and left side of the dressing layer 2 (as shown in FIG3, the upper left corner of the dressing layer 2). Second, the groove 21 penetrates the lower side and right side of the dressing layer 2 (as shown in FIG3, the lower right corner of the dressing layer 2), but is not limited thereto. When there are multiple grooves 21, the multiple grooves 21 can be configured to penetrate different side surfaces as required. This enriches the configuration of the grooves 21 and facilitates their corresponding configuration according to their left-right positions on the dressing layer 2, which is beneficial for the formation of the grooves 21 and the wetting of the electrolyte. For example, the conductive layer 1 can be a metal conductive foil, thereby improving the conductivity of the conductive layer 1. The grooves 21 on the dressing layer 2 can be formed by mechanical threading or laser ablation.

[0053] According to some embodiments of this disclosure, referring to FIG1, the width of the groove 21 is w, where w satisfies: 0.5μm≤w≤100μm. For example, when the width w of the groove 21 is less than 0.5μm, the width of the groove 21 is small, the capacity of the groove 21 is small, thereby reducing the capacity of the electrolyte in the groove 21 and increasing the amount of electrolyte that wets from the side of the dressing layer 2 away from the conductive layer 1, thus reducing the speed at which the electrolyte wets from the dressing layer 2 into the conductive layer 1; when the width w of the groove 21 is greater than 100μm, the width of the groove 21 is large, reducing the amount of material used in the dressing layer 2 and reducing the protective effect of the dressing layer 2 on the conductive layer 1. Therefore, by setting the width w of the groove 21 to satisfy 0.5μm≤w≤100μm, the width of the groove 21 is reasonably set, increasing the amount of electrolyte contained in the groove 21, thereby effectively ensuring that the electrolyte can wet from the bottom wall and side wall of the groove 21 into the conductive layer 1, thereby helping to improve the electrolyte wetting speed. In addition, the amount of material used in the dressing layer 2 was optimized, thereby improving the structural strength of the dressing layer 2 and enhancing its protective effect on the conductive layer 1.

[0054] Optionally, w further satisfies: 20μm≤w≤50μm. This further optimizes the width of the groove 21, and while ensuring the performance of the dressing layer 2, further optimizes the electrolyte capacity in the groove 21, increasing the contact area between the electrolyte and the sidewall of the groove 21, facilitating electrolyte wetting into the conductive layer 1, and helping to further improve the wetting speed.

[0055] According to some embodiments of this disclosure, referring to FIG1, the depth of the groove 21 is h1, and the thickness of the dressing layer 2 is h2, wherein h1 and h2 satisfy: 0 < h1 / h2 ≤ 0.9. For example, when the ratio of the depth h1 of the groove 21 to the thickness h2 of the dressing layer 2 is greater than 0.9, the difference between the depth of the groove 21 and the depth of the dressing layer 2 is small, that is, the distance between the bottom wall of the groove 21 and the surface of the corresponding conductive layer 1 is small, thereby reducing the protective effect of the dressing layer 2 on the conductive layer 1 and reducing the performance of the electrode 100. Therefore, by setting the depth h1 of the groove 21 and the thickness h2 of the dressing layer 2 to satisfy 0 < h1 / h2 ≤ 0.9, the ratio of the depth h1 of the groove 21 to the thickness h2 of the dressing layer 2 is reasonably set. While increasing the wetting speed through the groove 21, the protective effect of the dressing layer 2 on the conductive layer 1 is also improved, thereby improving the performance of the electrode 100.

[0056] Optionally, h1 and h2 further satisfy: 0.3≤h1 / h2≤0.7. This further rationalizes the ratio of the depth h1 of the groove 21 to the thickness h2 of the dressing layer 2, thereby increasing the electrolyte wetting speed and improving the protective effect of the dressing layer 2 on the conductive layer 1, thus further improving the performance of the electrode 100.

[0057] According to some embodiments of this disclosure, h2 satisfies: 20μm≤h2≤250μm. For example, when the thickness h2 of the dressing layer 2 is less than 20μm, the thickness of the dressing layer 2 is small, thereby reducing the activity retention effect of the dressing layer 2 on the conductive layer 1 and increasing the difficulty of forming the groove 21 on the surface of the dressing layer 2, thus reducing the production efficiency of the electrode 100. When the thickness h2 of the dressing layer 2 is greater than 250μm, the thickness of the dressing layer 2 is large, increasing the thickness of the electrode 100 and reducing the flexibility of the electrode 100. When the electrode 100 is wound into a cylindrical shape, the electrode 100 is not easy to bend, increasing the production difficulty of the electrode 100 and reducing the production efficiency of the electrode core 200. Therefore, by setting the thickness h2 of the dressing layer 2 to satisfy 20μm≤h2≤250μm, the thickness of the dressing layer 2 is reasonably set, which improves the retention effect of the dressing layer 2 on the conductive layer 1, reduces the difficulty of forming the groove 21 on the surface of the dressing layer 2, and improves the production efficiency of the electrode 100. In addition, the flexibility of the electrode 100 is improved. When the electrode 100 is wound into a cylindrical shape, it is easy to bend, which increases the production difficulty of the electrode 100 and improves the production efficiency of the electrode core 200.

[0058] According to some embodiments of this disclosure, the cross-sectional shape of the groove 21 is polygonal or arc-shaped. The cross-sectional shape of the groove 21 is simple and easy to form, thereby improving the forming efficiency of the groove 21. It should be noted that when the cross-sectional shape of the groove 21 is polygonal, the cross-sectional shape of multiple grooves 21 can be one or more of rectangles, trapezoids, and triangles, and the cross-sectional shapes of multiple grooves 21 can be the same or different.

[0059] According to some embodiments of this disclosure, referring to FIG1, the thickness of the conductive layer 1 is h3, where h3 satisfies: 9μm≤h3≤25μm. For example, in the example of FIG1, when the thickness h3 of the conductive layer 1 is less than 9μm, the thickness of the conductive layer 1 is small, thereby reducing the conductivity of the electrode 100 and weakening its performance; when the thickness h3 of the conductive layer 1 is greater than 25μm, the thickness of the conductive layer 1 is large, reducing the flexibility of the electrode 100, making it difficult to bend during winding, and increasing the manufacturing difficulty of the electrode core 200. In addition, a thicker conductive layer 1 requires more electrolyte for thorough wetting, which also prolongs the wetting time, thereby extending the production efficiency of the battery 300. Therefore, by setting the thickness h3 of the conductive layer 1 to satisfy 9μm≤h3≤25μm, the thickness of the conductive layer 1 is reasonably set, increasing the flexibility of the electrode 100, making it easier to bend during winding, and reducing the manufacturing difficulty of the electrode core 200. In addition, the amount of electrolyte that needs to be wetted in the conductive layer 1 is reduced, and the wetting time is also shortened, thereby reducing the production efficiency of the battery.

[0060] Further, referring to FIG2, along the second direction (i.e., the up-down direction), the groove 21 first bends and extends toward one of the two sides along the first direction (i.e., the left-right direction) away from the dressing layer 2, and then bends and extends toward one of the two sides along the first direction closer to the dressing layer 2. For example, in the example of FIG2, the groove 21 is approximately "C" shaped. The arrangement of the groove 21 can include the following cases: First, from top to bottom, the groove 21 first bends and extends toward the right side away from the dressing layer 2, and then bends and extends toward the right side closer to the dressing layer 2, with the middle portion of the groove 21 protruding toward the left side of the dressing layer 2 (as shown in FIG2); Second, along the up-down direction, the groove 21 first bends and extends toward the left side away from the dressing layer 2, and then bends and extends toward the left side closer to the dressing layer 2, with the middle portion of the groove 21 protruding toward the right side of the dressing layer 2 (not shown). This design effectively ensures that the groove 21 can penetrate both sides of the electrode 100 in the vertical direction. When the electrolyte flows along the sidewall of the groove 21, it fully contacts and wets the coating layer 2, thereby effectively improving the uniformity of wetting and further enhancing the performance of the electrode 100. Furthermore, when the electrode 100 is wound into a cylindrical shape in the horizontal direction, the groove 21 extends in a spiral shape along the outer circumference of the cylinder. The electrolyte can flow along the extension direction of the groove 21 or penetrate into the coating layer 2 from the sidewall of the groove 21. This facilitates the penetration of the electrolyte from the outside of the electrode core 200 into the coating layer 2 of the electrode 100, shortening the travel distance of the electrolyte from the outside of the electrode core 200 into the coating layer 2 of the electrode 100.

[0061] According to some embodiments of this disclosure, referring to FIG1, the dressing layer 2 is multi-layered, with each multi-layered dressing layer 2 disposed on both sides of the conductive layer 1 in the thickness direction. For example, in the example of FIG1, the dressing layer 2 has two layers, with each layer located on one side of the conductive layer 1 in the thickness direction. This arrangement allows the electrolyte to penetrate into the conductive layer 1 from both sides in the thickness direction, increasing the amount of electrolyte wetting the conductive layer 1 per unit time and improving the wetting effect, thereby contributing to improved performance of the electrode 100. It should be noted that the grooves 21 on the dressing layers 2 on both sides of the conductive layer 1 in the thickness direction can be opposite each other or staggered along the thickness direction of the conductive layer 1. However, this is not a limitation, and the specific configuration can be determined according to the actual application.

[0062] Further, referring to Figure 2, there are multiple grooves 21, which are arranged at intervals along a first direction (i.e., the left-right direction). In the description of this disclosure, "multiple" means two or more. For example, in the example of Figure 2, multiple grooves 21 are arranged at intervals along the left-right direction. With this arrangement, the electrolyte flows into the multiple grooves 21 in a dispersed manner, and the electrolyte can be wetted from different grooves 21, further improving the wetting speed of the electrolyte on the electrode 100. In addition, the multiple grooves 21 are arranged at intervals along the left-right direction, and the electrolyte can wet the electrode 100 from different positions, thereby improving the uniformity of wetting. In addition, it also increases the contact area between the electrolyte and the dressing layer 2, which is more conducive to the electrolyte wetting into the conductive layer 1.

[0063] According to some embodiments of this disclosure, referring to FIG1, the minimum distance between two adjacent grooves 21 is d, where d satisfies: 0.1mm ≤ d ≤ 20mm. For example, when the minimum distance d between two adjacent grooves 21 is less than 0.1mm, the distance between two adjacent grooves 21 is small, the multiple grooves 21 are arranged more densely, and the material of the dressing layer 2 between two adjacent grooves 21 is smaller, which reduces the structural strength of the dressing layer 2, thereby reducing the performance of the electrode 100, and increasing the processing difficulty of the grooves 21; when the minimum distance d between two adjacent grooves 21 is greater than 20mm, the distance between two adjacent grooves 21 is large, the multiple grooves 21 are arranged more sparsely, the number of grooves 21 is reduced, and the distribution of electrolyte in the multiple grooves 21 is also more dispersed, thereby reducing the uniformity of electrolyte wetting. Therefore, by setting the minimum distance d between two adjacent grooves 21 to satisfy 0.1mm≤d≤20mm, the minimum distance between two adjacent grooves 21 is set reasonably, and the number of grooves 21 is set reasonably. This not only increases the material of the dressing layer 2 between two adjacent grooves 21, increases the structural strength of the dressing layer 2, and improves the performance of the electrode 100, but also makes the electrolyte distributed reasonably in multiple grooves 21, thereby improving the uniformity of electrolyte wetting.

[0064] According to some embodiments of this disclosure, d further satisfies: 5mm ≤ d ≤ 10mm. This further optimizes the minimum distance between two adjacent grooves 21, making the distance between them more reasonable and also optimizing the number of grooves 21. This allows the electrolyte to flow more effectively into multiple grooves 21, further improving the wetting effect.

[0065] The electrode core 200 according to a second aspect embodiment of the present disclosure includes the electrode sheet 100 according to the first aspect embodiment of the present disclosure described above.

[0066] According to the electrode core 200 disclosed herein, by employing the aforementioned electrode sheet 100, the wetting effect of the electrolyte on the electrode core 200 is improved, and the formation of the electrode core 200 is also facilitated, thereby improving the performance of the electrode core 200 and increasing its production efficiency. For example, the conductive layer 1 portion protrudes to form multiple tabs 201. When the electrode sheet 100 is wound to form the electrode core 200, the multiple tabs 201 are arranged radially along the electrode core 200 to form positive or negative tabs, which is beneficial to the use of the electrode core 200.

[0067] The battery 300 according to a third aspect embodiment of the present disclosure, as shown in FIG6, includes the electrode core 200 according to the second aspect embodiment of the present disclosure described above.

[0068] According to the battery 300 disclosed herein, the performance of the battery 300 is improved by adopting the aforementioned electrode core 200.

[0069] The manufacturing steps of battery 300 are roughly as follows: First, according to the design of battery 300, two coating layers 2 (coating layer 2 can be a positive electrode coating layer or a negative electrode coating layer) are coated on both sides of the conductive layer 1 in the thickness direction. Then, the positive electrode sheet and the negative electrode sheet are rolled using a special roller, forming grooves 21 on the surface of the coating layer 2. Next, the positive electrode sheet, the separator of the electrode core 200 (not shown in the figure), and the negative electrode sheet are assembled in a conventional order, forming the electrode core 200 by stacking or winding, and then sealed into a sealed casing (not shown in the figure). After injecting electrolyte, it is sealed to form battery 300. Battery 300 can be a power battery 300 or an energy battery 300, but is not limited to these. For example, for a 150Ah energy battery 300, compared with an electrode with a flat coating layer without grooves, the electrolyte wetting time of the electrode 100 of this application is reduced from 48h to about 45.5h, a reduction of 5%, and the fast charging time of the battery 300 is shortened from 25min to about 23min, an improvement of 8% in fast charging capability.

[0070] A battery assembly 400 according to a fourth aspect embodiment of the present disclosure, as shown in FIG7 or FIG8, includes an electrode core 200 according to the second aspect embodiment of the present disclosure, or a battery 300 according to the third aspect embodiment of the present disclosure.

[0071] According to the battery assembly 400 disclosed herein, by employing the aforementioned electrode core 200 or the aforementioned battery 300, the performance of the battery assembly 400 is improved.

[0072] As shown in FIG9 and FIG10, the electrical device 500 according to the fifth aspect embodiment of the present disclosure includes a battery 300 according to the third aspect embodiment of the present disclosure, or a battery assembly 400 according to the fourth aspect embodiment of the present disclosure.

[0073] According to the electrical equipment 500 disclosed herein, by employing the aforementioned battery 300 or battery pack 400, the performance of the electrical equipment 500 is improved. It should be noted that the electrical equipment 500 can be a vehicle, aircraft, ship, computer, or energy storage cabinet, etc.

[0074] Other configurations and operations of the electrode 100, electrode core 200, battery 300, battery assembly 400, and electrical device 500 according to embodiments of this disclosure are known to those skilled in the art and will not be described in detail here.

[0075] In the description of this disclosure, it should be understood that the terms “center,” “width,” “thickness,” “upper,” “lower,” “left,” “right,” “inner,” “outer,” “axial,” “radial,” “circumferential,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0076] In the description of this specification, the references to terms such as "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 disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0077] Although embodiments of this disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. An electrode (100), characterized in that, include: Conductive layer (1); and A dressing layer (2) is disposed on the surface of the conductive layer (1). Along a first direction, the dressing layer (2) has two opposing sides. At least one groove (21) is formed on the dressing layer (2). At least a portion of the groove (21) bends and extends along a second direction toward one of the two sides along the first direction away from the dressing layer (2). The first direction and the second direction intersect.

2. The electrode (100) according to claim 1, characterized in that, When the electrode (100) is wound into a cylindrical shape along the first direction, the groove (21) is a spiral groove (21) that extends and bends along the circumference of the cylinder.

3. The electrode (100) according to claim 1 or 2, characterized in that, The groove (21) penetrates both sides of the dressing layer (2) along the second direction; or The groove (21) extends through the adjacent two sides of the dressing layer (2).

4. The electrode (100) according to any one of claims 1-3, characterized in that, The width of the groove (21) is w, wherein w satisfies: 0.5μm≤w≤100μm.

5. The electrode (100) according to claim 4, characterized in that, The w further satisfies: 20μm≤w≤50μm.

6. The electrode (100) according to any one of claims 1-5, characterized in that, The depth of the groove (21) is h1, and the thickness of the dressing layer (2) is h2, wherein h1 and h2 satisfy: 0 < h1 / h2 ≤ 0.

9.

7. The electrode (100) according to claim 6, characterized in that, h1 and h2 further satisfy: 0.3≤h1 / h2≤0.

7.

8. The electrode (100) according to claim 6 or 7, characterized in that, The h2 satisfies: 20μm≤h2≤250μm.

9. The electrode (100) according to any one of claims 1-8, characterized in that, The cross-sectional shape of the groove (21) is polygonal or arc-shaped.

10. The electrode (100) according to any one of claims 1-9, characterized in that, The thickness of the conductive layer (1) is h3, and h3 satisfies: 9μm≤h3≤25μm.

11. The electrode (100) according to any one of claims 1-10, characterized in that, Along the second direction, the groove (21) first bends toward one of the two sides along the first direction away from the dressing layer (2), and then bends toward one of the two sides along the first direction closer to the dressing layer (21).

12. The electrode (100) according to any one of claims 1-10, characterized in that, The dressing layer (2) is multi-layered, and the multi-layered dressing layer (2) is respectively disposed on both sides of the conductive layer (1) in the thickness direction.

13. The electrode (100) according to any one of claims 1-10, characterized in that, There are multiple grooves (21), and the multiple grooves (21) are arranged at intervals along the first direction.

14. The electrode (100) according to claim 13, characterized in that, The minimum distance between two adjacent grooves (21) is d, wherein d satisfies: 0.1mm≤d≤20mm.

15. The electrode (100) according to claim 14, characterized in that, The d further satisfies: 5mm≤d≤10mm.

16. An electrode core (200), characterized in that, Includes the electrode (100) according to any one of claims 1-15.

17. A battery (300), characterized in that, Includes the electrode core (200) according to claim 16.

18. A battery assembly (400), characterized in that, Includes the electrode core (200) according to claim 16, or the battery (300) according to claim 17.

19. An electrical appliance (500), characterized in that, Includes the battery (300) according to claim 17, or the battery assembly (400) according to claim 18.

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